TWI494486B - Combined steel sheet pile, diaphragm wall, and method of reutilizing combined steel sheet pile - Google Patents

Description

Reuse method of combined steel sheet pile, underground continuous wall and combined steel sheet pile Technical field

The invention relates to a method for constructing a combined steel sheet pile, an underground continuous wall and a combined steel sheet pile for a retaining wall, a retaining wall and a foundation structure in the civil engineering field.

The priority of Japanese Patent Application No. 2011-155710, filed on Jan. 14, 2011, which is hereby incorporated by reference.

Background of the invention

In general, the proposal has various methods of construction as a method of excavating the site and constructing underground structures. As such a method, for example, it is known that the underground continuous wall for temporary installation is placed in the ground and the single-sided side is excavated, and the main wall for the official installation is constructed, or the temporary setting and the formal setting are used. Use the soil cement wall or field cast reinforced concrete wall to construct the underground method.

However, in the method of temporarily setting the underground continuous wall, the method of using the cement wall or the field-cast reinforced concrete wall as the temporary continuous wall for temporary installation cannot be removed after the construction of the underground structure. The influence of the wall on the temporary installation of the underground continuous wall to construct a new underground structure may cause problems.

Further, as a method of using the steel wall body which can be pulled out and removed as a temporary underground wall, it is known that there is a main pile transverse slab method or a steel sheet pile method. However, in these methods, when the excavation depth is deeper than 10 m, Since it is often difficult to use the case where the rigidity of the section is insufficient, it is difficult to use a point such as a tie or a ground anchor which is redundant.

For example, the steel pipe for the underground continuous wall which is excellent in the cross-sectional rigidity of the above-mentioned problem is a steel pipe pile which is attached to the steel pipe of a large diameter and which is a small-diameter steel pipe as a joint.

Moreover, as a steel material for underground continuous walls excellent in other cross-section rigidity, a combined steel sheet pile in which a steel sheet pile and an H-shaped steel are combined is known.

As an example of the combined steel sheet pile, Patent Document 2 discloses a combined steel sheet pile in which the shape of the right and left joints is an asymmetrical linear steel sheet pile, and the H-shaped steel is joined by welding.

Further, Patent Document 3 discloses a steel sheet pile 110 having an asymmetrical cross-hat shape in the shape of the right and left joints 111, and a combined steel sheet pile 101 in which an H-shaped steel 130 is joined, as shown in FIG. 26A to FIG. 27B. In the case where the steel sheet pile 101 is joined to the H-beam 130, as shown in Figs. 26A and 27A, the welded portion W is used, or as shown in Figs. 26B and 27B, the joint bolt 141 and the joint snail are used. Cap 145.

Advanced technical literature Patent literature

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2005-105726

[Patent Document 2] Japanese Patent Laid-Open No. Hei 11-140864

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2002-212943

Summary of invention

However, since the combined steel sheet pile 101 is used as the steel sheet pile 110 which is easy to be a thin-walled large-section, the steel sheet pile 110 as a whole or the joint 111 is easily deformed and damaged during the laying operation and the drawing operation of the combined steel sheet pile 101. The full width W1 of the pile 110 or the opening width W2 of the joint 111 is liable to change state.

Therefore, in order to construct the temporary continuous wall for the temporary installation and reuse the combined steel sheet pile 101, the joint 111 of the combined steel sheet pile 101 or the steel sheet pile 110 as a whole is greatly deformed and damaged. In this way, when the joint 111 of the steel sheet pile 110 which is provided first is engaged, the joint 111 of the steel sheet pile 110 which is laid later is fitted, the resistance of the joint portion is increased, or the joint 111 is separated from each other. However, the operation of assembling the steel sheet pile 101 becomes difficult.

In order to solve the above problem, there is also an idea for the combined steel sheet pile 101 to be reused, which is to remove the easily set steel sheet pile 110 which is easily deformed from the H-shaped steel 130 which is not easily deformed and damaged, and to be new. The steel sheet pile 110 is joined to the steel sheet pile 110 of the installed H-shaped steel 130, whereby the steel sheet pile 110 of the combined steel sheet pile 101 can be exchanged.

However, as shown in FIG. 26A and FIG. 26B, the conventional steel sheet pile 101 is formed by joining together the steel sheet pile 110 having the same length in the longitudinal direction and the H-shaped steel 130. Therefore, the conventional steel sheet pile 101 must also include a portion that is deformed and less damaged and can be reused, and the steel sheet pile 110 is exchanged over the entire length. As a result, there is still room for improvement from an economic point of view.

In particular, as shown in FIG. 26A, when the steel sheet pile 110 and the H-beam 130 are traversed in the longitudinal direction and are joined by the welded portion W, the H-shaped steel is used. When the steel sheet pile 110 is removed 130, it is necessary to remove the welded bead (welded portion W) or the like by a polishing treatment or the like. In other words, the longer the total length of the combined steel sheet pile 101, the larger the working time and the work load during the exchange operation of the steel sheet pile 110, resulting in lower economy and workability. Further, when the new steel sheet pile 110 is joined to the H-shaped steel 130 that has been installed, the welded bead (welded portion W) or the like must be completely removed and the surface of the steel material must be finished, and the working time and work load are further increased.

Further, as shown in FIG. 26B, when the steel sheet pile 110 and the H-shaped steel 130 are bolted over the entire length, the operation time for the piercing operation of the bolt insertion hole or the locking work of the joint bolt 141 and the joint nut 145 is caused. And the cost of operations increased. At this time, it will also lead to economic and operational decline.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a combination of workability and economy in the case of reusing a steel sheet pile by exchanging steel sheet piles. Recycling method of steel sheet pile, underground continuous wall and combined steel sheet pile.

In order to achieve the object of solving the above problems, the present invention adopts the following aspects.

(1) An aspect of the present invention is a composite steel sheet pile having a steel sheet pile and an H-shaped steel, wherein the steel sheet pile system has a plurality of sheet pile members vertically divided in a longitudinal direction; The sheet pile member at least one end portion of the side direction is a sheet pile member that is detachable from the H-shaped steel.

(2) The steel sheet pile according to the above (1), when viewed in a cross section perpendicular to the longitudinal direction, the steel sheet pile system may have a pair of steel sheet pile wing portions provided at both ends of the net portion, The arm portion provided at the front end of the steel sheet pile flap portion and the joint provided at the front end of the arm portion are hat-shaped steel sheet piles.

(3) The steel sheet pile according to the above-mentioned (1) or (2), wherein the length of the longitudinal direction of the sheet pile member for exchange is 50 cm or more, and the longitudinal direction of the steel sheet pile is The length is 0.2 times or less.

(4) The composite steel sheet pile according to any one of the above (1) to (3), further comprising a joint bolt for joining the H-shaped steel and the exchange sheet pile member.

(5) The composite steel sheet pile according to any one of the above-mentioned items, wherein the composite steel sheet pile may have a plurality of the joint bolts; the H-shaped steel has a plurality of bolt insertion holes, and the bolt insertion holes are insertable The joining sheet pile member is joined to the joint bolt of the H-shaped steel wing portion; further, the number of the joint bolts is smaller than the number of the bolt insertion holes.

(6) The composite steel sheet pile according to any one of the above items (1) to (3), further comprising a welded portion that joins the H-shaped steel and the exchange sheet pile member.

(7) The composite steel sheet pile according to any one of the above-mentioned items (1), wherein the exchange sheet pile member and the sheet pile member may be provided with a water stop layer containing an expandable water stop material. .

(8) The underground continuous wall of the composite steel sheet pile according to any one of the above items (1) to (7) may have a plurality of combined steel sheet piles and will be adjacent to each other The joints of the respective combination steel sheet piles are connected to each other to be constructed.

(9) The method for reusing a combined steel sheet pile constituting the underground continuous wall as described in the above (8) may have the following steps: pulling the combined steel sheet pile constituting the underground continuous wall from the ground; and removing the combined steel sheet pile from the foregoing The exchange sheet pile member; and the other combination sheet pile member to which the exchange sheet pile member has been removed.

According to the aspects described in the above (1) to (9), it is possible to exchange only the particularly easy deformation and damage of the steel sheet pile. Therefore, when the composite continuous steel sheet pile is used to construct the underground continuous wall, it is possible to reduce the construction cost by suppressing the amount of steel used. Further, the combined steel sheet pile can be reused by only partially exchanging the steel sheet pile. Therefore, it is possible to shorten the working time required for the disassembly work of the sheet pile member for exchange.

According to the aspect described in the above (3), it is possible to leave the steel sheet pile where it is difficult to be deformed or damaged, and exchange only the parts which are easily deformed or damaged. Therefore, when the combined steel sheet pile is reused, the amount of steel used can be more effectively suppressed.

According to the aspect described in the above (4), the sheet pile member for exchange can be exchanged by performing only the dismounting operation of the joint bolt and the joint nut. Therefore, the working time required for the disassembly work of the sheet pile member for exchange can be shortened.

According to the aspect described in the above (5), when the new exchange sheet pile member is bolted to the H-shaped steel, the H-shaped steel perforated new bolt can be inserted into the through hole, and the necessary joint strength can be secured.

According to the aspect described in the above (6), the sheet pile member for exchange can be exchanged by cutting only the welded portion. Therefore, the sheet pile member for exchange can be shortened The working time required for the punching operation of the bolt insertion hole of the H-shaped steel or the locking operation of the joint bolt and the joint nut.

According to the aspect described in the above (7), even when the underground continuous wall is constructed, when the groundwater level is higher than the boundary between the plurality of sheet pile members, the water leakage layer can be prevented from leaking water from the boundary portion.

Simple illustration

Fig. 1A is a plan view showing a combined steel sheet pile in a first embodiment of the present invention.

Figure 1B is a partial cross-sectional plan view showing an enlarged portion of Figure 1A.

Fig. 2A is a front elevational view showing a combined steel sheet pile in the first embodiment.

Figure 2B is a partial cross-sectional rear view of Figure 2A.

Fig. 3A is a front elevational view showing the upper end portion of the steel sheet pile in the first embodiment;

Fig. 3B is a partial cross-sectional rear view of the upper end portion of Fig. 3A.

Fig. 4A is a front elevational view showing a sheet pile member for exchange of a steel sheet pile in a first embodiment;

Fig. 4B is a front elevational view showing the upper end portion of the combined steel sheet pile in the state in which the sheet pile member for exchange is removed from the H-shaped steel of Fig. 4A.

Fig. 5A is a plan view showing a subterranean continuous wall constructed by combining steel sheet piles in the first embodiment.

Figure 5B is a front elevational view of the underground continuous wall of Figure 5A.

Fig. 6 is a side view schematically showing the underground continuous wall constructed by using the steel sheet pile in the first embodiment.

Fig. 7 is a plan view schematically showing a subterranean continuous wall constructed by using a U-shaped steel sheet pile as a steel sheet pile of a steel sheet pile in the first embodiment.

Fig. 8 is a plan view showing a combined steel sheet pile in which a flap of an H-beam is superposed and joined to a single side of a concave portion side formed by a web portion of a steel sheet pile and a pair of fins.

Fig. 9A is a plan view showing a subterranean continuous wall constructed by combining steel sheet piles in a modification of the first embodiment.

Figure 9B is a front elevational view of the underground continuous wall of Figure 9A.

Fig. 10A is a side view schematically showing a subterranean continuous wall which has been constructed using a combination steel sheet pile which is provided only for the lower end portion of the steel sheet pile.

Fig. 10B is a side view schematically showing a subterranean continuous wall which has been constructed using a combination steel sheet pile which is provided only with an upper sheet pile member for the upper end portion of the steel sheet pile.

Fig. 11A is a plan view showing a combined steel sheet pile in a modified form of the first embodiment.

Figure 11B is a partial cross-sectional plan view showing an enlarged portion of Figure 11A.

Fig. 12 is a view schematically showing a subterranean structure constructed by combining steel sheet piles according to the first embodiment.

Fig. 13A is a side view schematically showing a state in which the steel sheet pile of the first embodiment is placed on the ground.

Fig. 13B is an exploded side view schematically showing a state in which the sheet pile member for exchange has been removed from the steel sheet pile of Fig. 13A.

Fig. 14 is a view showing a state in which the joint nut is removed from the joint bolt of the steel sheet pile in the first embodiment.

Fig. 15A is a graph showing the relationship between the full width of the steel sheet pile obtained by the confirmation experiment and the distance from the upper end of the steel sheet pile.

Fig. 15B is a graph showing the relationship between the full width of the steel sheet pile obtained by the confirmation experiment and the distance from the upper end of the steel sheet pile.

Fig. 16A is a view showing the relationship between the joint opening width of the steel sheet pile obtained by the confirmation experiment and the distance from the upper end of the steel sheet pile.

Fig. 16B is a view showing the relationship between the joint opening width of the steel sheet pile obtained by the confirmation experiment and the distance from the upper end of the steel sheet pile.

Fig. 17A is a partial cross-sectional rear view showing a state in which eight joint bolts have been used for joining the H-beam and the sheet pile member for exchange.

Fig. 17B is a partial cross-sectional rear view showing a state in which six joint bolts have been used for joining the H-beam and the sheet pile member for exchange.

Fig. 18A is a plan view showing a state in which a reinforcing plate is placed between the sheet pile member for exchange which has traversed the combined steel sheet pile and the sheet pile member adjacent thereto.

Figure 18B is a front elevational view of the upper end portion of the composite steel sheet pile of Figure 18A.

Figure 18C is a rear elevational view of the upper end portion of the composite steel sheet pile of Figure 18A.

Fig. 19 is a side view schematically showing the underground continuous wall which has been constructed using the combined steel sheet pile in the second embodiment.

Fig. 20 is a front elevational view showing the upper end portion of the combined steel sheet pile in the second embodiment.

Fig. 21A is a front elevational view showing a sheet pile member for exchange of steel sheet piles in a second embodiment;

Fig. 21B is a front elevational view showing the upper end portion of the combined steel sheet pile in a state in which the sheet pile member for exchange of Fig. 21A has been removed from the H-shaped steel.

Fig. 22 is a partial cross-sectional plan view showing a fixing mold used for combining steel sheet piles in the third embodiment.

Fig. 23A is a plan view showing a combined steel sheet pile in the fourth embodiment.

Figure 23B is a rear elevational view of the upper end portion of the composite steel sheet pile of Figure 23A.

Fig. 24A is a plan view showing a continuous underground wall constructed by combining steel sheet piles in the fifth embodiment.

Figure 24B is a front elevational view of the underground continuous wall of Figure 24A.

Fig. 25A is a plan view showing a subterranean continuous wall constructed by combining steel sheet piles in the sixth embodiment.

Figure 25B is a plan view showing the expansion of the combined steel sheet pile used in the underground continuous wall shown in Figure 25A.

Fig. 26A is a plan sectional view showing an example of a conventional combined steel sheet pile.

Fig. 26B is a plan sectional view showing another example of a conventional combined steel sheet pile.

Fig. 27A is a side view schematically showing a subterranean continuous wall which has been constructed using a combined steel sheet pile as a conventional example.

Fig. 27B is a side view schematically showing a subterranean continuous wall which has been constructed using a combined steel sheet pile as another conventional example.

Form for implementing the invention

In the following, the embodiments of the present invention are described in detail with reference to the drawings, and the present invention is not limited thereto, and various modifications may be made without departing from the scope of the invention. In addition, in order to make the characteristics of the present invention easy to understand and to facilitate the operation, the part of the important part is enlarged and displayed, and the size ratio of each component is not limited to the same as the official setting. .

[First Embodiment]

First, the combination of the steel sheet pile in the first embodiment will be described.

As shown in FIGS. 1A to 4B, the combined steel sheet pile 1 has a steel sheet pile 10 and an H-shaped steel 30 joined to the steel sheet pile 10. The combined steel sheet pile 1 is used to construct the underground continuous wall 3 underground. As shown in FIG. 5A to FIG. 6, the underground continuous wall 3 is constructed by being placed on the ground in a state where the plurality of combined steel sheet piles 1 are transmitted through the joints 11 provided in the steel sheet piles 10 and connected to each other. Specifically, the underground continuous wall 3 has a plurality of combined steel sheet piles 1, and the joints 11 of the respective combined steel sheet piles 1 adjacent to each other are connected to each other to be constructed. At this time, the combined steel sheet pile 1 is driven underground by a publicly known driving device such as a hydraulic presser or a vibrating setter.

As shown in FIG. 1A to FIG. 4B, the steel sheet pile 10 has a joint 11 provided at both end portions in the sheet width direction and a belly portion provided at the center portion in the sheet width direction when viewed in a cross section perpendicular to the longitudinal direction. Plate portion 13.

In the present embodiment, the steel sheet pile 10 is composed of a hat-shaped steel sheet pile, and the hat-shaped steel sheet pile has a web portion 13 (a steel sheet pile web portion) provided at a central portion in the sheet width direction, and a web portion 13 ends are provided obliquely to one side of the web portion 13 and one pair of flaps 15 (steel sheet pile flaps), and an arm portion 17 provided in parallel with the web portion 13 from the front end of the flap 15 and disposed on the arm portion 17 front end connector 11. Further, the pair of flaps 15 are disposed obliquely so as to be further apart from each other as they are distant from the web portion 13.

As shown in Fig. 7, the steel sheet pile 10 may be formed of another hat-shaped steel sheet pile, that is, a U-shaped steel sheet pile, which has a web portion 13 provided at a central portion in the width direction of the sheet when viewed in the cross section, and a belly portion. Both ends of the plate portion 13 are oriented One side of the web portion 13 is obliquely disposed to one of the flaps 15. Further, the steel sheet pile 10 may be formed of a linear steel sheet pile or the like.

The joint 11 is adjusted in shape so that it can be fitted to each other with respect to the joint 11 of the other steel sheet pile 10. Further, when the joint 11 is fitted to the joint 11 of the other steel sheet pile 10, the shape is adjusted so as not to be separated from each other. The adjacent steel sheet piles 10 are joined by fitting the individual joints 11 to each other.

The H-beam 30 has a web portion 31 (H-shaped steel web portion) and a pair of flaps 33 (H-shaped steel fins) provided at both ends of the web portion 31. The H-beam 30 overlaps one of the flaps 33 (H-shaped steel fins) and is joined to one side of the web portion 13 (the steel sheet pile web portion) of the steel sheet pile 10. In the present embodiment, the H-beam 30 is formed by laminating one of the flaps 33 (H-shaped steel fins) on one side of the opposite side and joining the web portion 13 (the steel sheet pile web portion) of the steel sheet pile 10 with a pair of flaps. A recess 16 formed by 15 (steel sheet pile wing). As shown in FIG. 8, the H-shaped steel 30 may be overlapped and joined to one side of the web portion 13 of the steel sheet pile 10 and the side of the concave portion 16 formed by the pair of flaps 15.

Here, as shown in FIG. 2A, in the present embodiment, the steel sheet pile 10 is composed of a plurality of sheet pile members 21 and 23, and the sheet pile members 21 and 23 are vertically divided into the longitudinal direction of the steel sheet pile 10 shape. In the present embodiment, the steel sheet pile 10 is composed of three sheet pile members 21 and 23. Further, the sheet pile members 21 and 23 are made of a steel material. The plurality of sheet pile members 21 and 23 are joined to each other in the same direction in the longitudinal direction of the H-shaped steel 30, and are joined to the H-shaped steel 30 to function as one steel sheet pile 10.

The sheet pile member 21 of at least one of the upper end portion 10a and the lower end portion 10b on both sides in the longitudinal direction of the steel sheet pile 10 is detachably attached to the H-shaped steel 30 The exchange is made up of a sheet pile member 23. Specifically, the steel sheet pile 1 has a joint 11 provided at both end portions in the sheet width direction and a steel sheet provided at the web portion 13 at the center portion in the sheet width direction when viewed in a cross section perpendicular to the longitudinal direction. The pile 10 and the H-shaped steel 30 which overlaps the blade 33 and is joined to the web portion 13 of the steel sheet pile 10, the steel sheet pile 10 has a plurality of sheet pile members 21 vertically divided in the longitudinal direction, and The sheet pile member 21 at the end of at least one of the longitudinal directions is a sheet pile member 23 that is detachable from the H-beam 30. In the present embodiment, the sheet pile member 21 having both the upper end portion 10a and the lower end portion 10b of the steel sheet pile 10 is configured as the sheet pile member 23 for exchange. However, as shown in FIG. 10A and FIG. 10B, at least one of them may be configured as the sheet pile member 23 for exchange.

When the composite sheet pile member 1 is reused, the exchange sheet pile member 23 is provided for the purpose of being exchanged for the new exchange sheet pile member 23 when the exchanged sheet pile member 23 is deformed or the like. The sheet pile member 23 for exchange is joined so as to be detachable from the H-beam 30 in order to improve the workability in the disassembly work for the exchange. In the present embodiment, the exchange sheet pile member 23 is screwed to the H-shaped steel 30 by the screwing engagement of the nut 45 to the joint bolt 41. Specifically, the combined steel sheet pile 1 further includes a joint bolt 41 that joins the H-shaped steel 30 and the exchange sheet pile member 23 and a joint nut 45. However, it is also possible to join the welded portion W of the exchange sheet pile member 23 from the H-beam 30 by cutting the welded portion W.

The steel sheet pile 10 of the combined steel sheet pile 1 has a particularly easy deformation and damage at its upper end portion 10a and lower end portion 10b. This is due to the lower end of the steel sheet pile 10 When the combined steel sheet pile 1 is placed, the portion 10b easily comes into contact with an embedded material such as gravel in the ground, and is easily deformed or damaged by the contact. In the upper end portion 10a of the steel sheet pile 10, when the steel sheet pile 1 is assembled or pulled by a vibrating machine or the like, the drive unit is gripped by a driving device to transmit the driving force from the driving device. Therefore, it is easy to be deformed or damaged due to the load or the like from the driving device during the operation or the like. Further, the upper end portion 10a and the lower end portion 10b of the steel sheet pile 10 are easily deformed and damaged compared to other portions due to various loads such as earth pressure. From the above-described defects, the sheet pile member 21 of at least one of the upper end portion 10a and the lower end portion 10b of the steel sheet pile 10 is provided as the sheet pile member 23 for exchange. Here, the term "deformation" as used herein means that the axis of the longitudinal direction of the steel sheet pile 10 is bent away from the width direction of the plate, and the axis of the longitudinal direction is twisted toward the thickness direction of the plate, toward the plate of the steel sheet pile 10. Expansion or contraction in the width direction, separation of the joint 11 of the steel sheet pile 10, and the like. Here, the term "injury" as used herein means a scratch or burn of the joint 11 of the steel sheet pile 10, or partial breakage or cutting of the steel sheet pile 10.

In the present embodiment, the sheet pile member 23 for exchange is constituted by a short-sized sheet pile member 21 having a shorter length in the longitudinal direction than the sheet pile member 21 disposed in the intermediate portion 10e in the longitudinal direction of the steel sheet pile 10. In other words, the plurality of sheet pile members 21 are composed of a short-sized sheet pile member of the exchange sheet pile member 23 and a long-sized sheet pile member having a longer length in the longitudinal direction than the short-sized sheet pile member. In the example shown in Figs. 1A to 6 , 10A, and 10B, the sheet pile members 23 for exchange are all composed of short-sized sheet pile members, and are composed of long-sized sheet pile members other than the sheet pile members 23 for exchange. .

The sheet pile member 21 other than the sheet pile member 23 for exchange and the exchange The sheet pile member 23 is different, and the joint mechanism with respect to the H-section steel 30 is not particularly limited. In addition to the joining of the welded portion W such as the fillet welding of the present embodiment, for example, a bolt, a tapping screw or the like can be used.

The sheet pile member 23 for exchange is disposed on the upper end portion 10a or the lower end portion 10b of the steel sheet pile 10 which has a small bending moment or shearing force. Therefore, as long as the function of connecting the adjacent steel sheet piles 1 in the case of constructing the underground continuous wall 3 is exhibited, and when the underground continuous wall 3 is constructed, it is prevented from the one-side side of the steel sheet pile 10 toward the other surface side. The function of leaking soil sand can be. Moreover, there is no need to have a load as a function of the rigidity of the underground continuous wall 3. On the other hand, the H-shaped steel 30 must be adjusted to the thickness of the plate or the like to ensure the rigidity as the underground continuous wall 3.

However, as a modification of the embodiment, the continuous underground wall 3 shown in Figs. 9A and 9B is preferably raised in rigidity closer to the end side than the cut portion 74. In this modification, the sheet pile member 23 for exchange is disposed on the upper end portion 10a or the lower end portion 10b of the steel sheet pile 10, or the entire sheet pile member 23 for exchange is composed of a short-sized sheet pile member and the sheet pile member 23 for exchange. The sheet pile members are constructed and the like, and are the same as described above. However, when the continuous underground wall 3 is constructed, the combination steel sheet piles 1 having different lengths in the longitudinal direction of the sheet pile member 23 for exchange are alternately arranged. Specifically, as shown in FIG. 9A and FIG. 9B, the continuous underground wall 3 may have a plurality of combined steel sheet piles 1 having exchange sheet pile members 23x and 23y having different lengths in the longitudinal direction, and having The combined steel sheet piles 1 of the exchange sheet pile members 23x and 23y having different lengths in the longitudinal direction are adjacent to each other, and these are mutually The joints 11 of the respective steel sheet piles 1 to be joined are constructed to be connected to each other. For example, the continuous underground wall 3 having the configuration shown in FIG. 9B has a combination steel sheet pile 1 having a shorter length in the longitudinal direction than the exchange sheet pile member 23x, and has a exchange plate. The combination steel sheet piles 1 of the pile members 23x are connected adjacently. The boundary portion 74 between the sheet pile member 21 and the exchange sheet pile members 23x and 23y may have a stress concentration, and further causes a decrease in the rigidity of the upper end portion 10a or the lower end portion 10b of the combined steel sheet pile 1. (Because the upper end portion 10a or the lower end portion 10b does not transmit force between the sheet pile member 23 for exchange and the sheet pile member 21, the hat-shaped steel sheet pile cannot be considered as a structural member.) It is shown in Figs. 9A and 9B. The continuous underground wall 3 and the boundary portion 74 are discontinuous between the adjacent composite steel sheet piles 1. Further, since the boundary portion 74 is fitted to the joint 11 of the adjacent steel sheet pile 1 adjacent thereto, stress concentration is less likely to occur. Further, for example, the sheet pile member 23y for exchange, the steel sheet pile 10 in which the boundary portion 74 is disposed from the end portion can be considered to have a long portion in the cross section of the hat-shaped steel sheet pile, and can be suitably raised at the upper end portion 10a or the lower end portion 10b. Rigidity.

In the present embodiment, the joint bolt 41 is disposed such that the bolt head portion 42 is located on the outer surface 23a side of the exchange sheet pile member 23. As a result, as described later, the workability at the time of the disassembly work of the sheet pile member 23 for exchange can be improved. In addition to the above, the joint bolt 41 may be disposed such that the bolt head portion 42 is located on the inner surface 23b side of the exchange sheet pile member 23.

In the present embodiment, the joint bolt 41 is fixed to the outer surface 23a of the sheet pile member 23 for exchange. As described above, the mechanism for fixing the joint bolt 41 uses, for example, the fixed mold 51, the welded portion W, and the like described below.

The fixed molds 51 are overlapped and disposed on the sheet pile member 23 for exchange. Outside 23a. The fixed mold 51 is composed of a metal material such as a steel material, a resin material or the like.

The fixed mold 51 is formed with a fitting hole 53 having a shape corresponding to the bolt head 42 of the joint bolt 41. The joint bolt 41 is disposed such that the bolt head portion 42 is fitted into the fitting hole 53 of the fixed mold 51. When the joint bolt 53 is to be rotated, the fitting hole 53 of the fixed mold 51 is formed such that the outer peripheral surface of the joint bolt 41 can be engaged with the inner peripheral surface of the fitting hole 53. In the present embodiment, since the bolt head portion 42 of the joint bolt 41 is formed in a hexagonal column shape, the fitting hole 53 of the fixed mold 51 is formed in a hexagonal shape.

Further, the fitting hole 53 of the fixed mold 51 is in a state in which the outer circumferential surface of the bolt head portion 42 is in contact with the inner circumferential surface of the fitting hole 53, and the operation direction of the joint bolt 41 fitted to the inner side is caused. The friction between the outer circumferential surface of the bolt head portion 42 and the inner circumferential surface of the fitting hole 53 is restricted. When the movement of the joint bolt 41 in the axial direction is restricted, the fitting hole 53 of the fixed mold 51 may be provided with a closed gap from the outside.

As a result, the joint bolt 41 is fixed to the outer surface 23a of the sheet pile member 23 for exchange, and the rotation or the movement in the axial direction is restricted. In the fixed mold 51 of the present embodiment, the bolt head portions 42 of the different joint bolts 41 are fitted to the respective holes formed in the plurality of fitting holes 53 of the same, so that they are not integrally rotated with the joint bolts 41. When the fixed mold 51 is not integrally rotated with the joint bolt 41, the fixed mold 51 may be joined to the outer surface 23a of the exchange sheet pile member 23 by welding or the like.

Further, as shown in FIGS. 11A and 11B, as a mechanism for fixing the joint bolt 41 in a state where the rotation thereof is restricted, the melting can be exemplified. The joint portion W fixes the joint bolt 41 to the outer surface 23a of the exchange sheet pile member 23.

As will be described later, the joint bolt 41 can be fixed to the outer surface 23a of the exchange sheet pile member 23, and the workability at the time of the detachment operation of the exchange sheet pile member 23 can be improved.

Next, a method of constructing the underground continuous wall 3 using the combined steel sheet pile 1 in the present embodiment or a method of recycling the combined steel sheet pile 1 will be described.

First, the combined steel sheet pile 1 is transported to a predetermined work site. At this time, the combination sheet pile member 23 of the exchange sheet pile member 23 and the removed exchange sheet pile member 23 can be separately transported to the site, and the integrated person in the factory or the like can be transported to the site in advance.

Next, the underground continuous wall 3 is constructed by using the composite steel sheet pile 1 in the ground. The method of constructing the underground continuous wall 3 is not particularly limited as long as the publicly known method can be suitably used. An example of the construction method of the underground continuous wall 3 will be described. First, the combination steel sheet pile 1 is first laid underground. Next, in a state in which the joint 11 of the steel sheet pile 10 of the first steel sheet pile 1 to be combined and the joint 11 of the steel sheet pile 10 of the combined steel sheet pile 1 which are subsequently joined are fitted to each other, the combined steel sheet pile 1 is carried out. Set to the underground. As shown in FIGS. 5A, 5B, and 6, the underground continuous wall 3 is constructed by repeating the work.

After the construction of the underground continuous wall 3, the necessary follow-up works are carried out according to the use of the underground continuous wall 3. In the following, the underground continuous wall 3 in the present embodiment is used as a temporary retaining wall to construct an underground structure. As an example, it is explained for this follow-up project. At this time, as shown in FIG. 12, the underground continuous wall 3 is previously laid so as to surround the construction position of the underground structure 5. Then, after the ground in the range surrounded by the plurality of underground continuous walls 3 is excavated, the traverse girders 7 are erected in the vertical direction with respect to the plurality of underground continuous walls 3, and then the underground structure 5 is constructed and the operation is completed.

After the underground structure 5 is constructed, the plurality of composite steel sheet piles 1 constituting the underground continuous wall 3 are pulled down from the ground and removed. The drawing operation of the combined steel sheet pile 1 is performed by a publicly known driving device such as a vibrating machine. When the underground continuous wall 3 is used as the temporary retaining wall as described above, in the case where the combined steel sheet pile 1 is removed, the brace 7 is first removed, and then the underground continuous wall 3 and the underground structure 5 are excavated by the excavated soil. The backfill is interposed and the combined steel sheet pile 1 is pulled out from the ground.

After the combined steel sheet pile 1 is pulled out, the assembled sheet pile member 23 is removed from the drawn steel sheet pile 1. When the exchanged sheet pile member 23 is removed, only the existing exchange sheet pile member 23 which is deformed and damaged in the exchange sheet pile member 23 which is provided can be removed. For example, in the combined steel sheet pile 1 shown in Fig. 5A, the removal of the exchanged sheet pile member 23 is loosened by the joint bolts 41 and the joint nut 45 which are bolted to the H-beam 30 for the joint exchange sheet pile member 23. Open and remove it. Further, when the H-beam 30 and the exchange sheet pile member 23 are joined by the welded portion W, the exchange sheet pile member 23 can be removed from the H-beam 30 by cutting the welded portion W.

As shown in FIG. 13A, FIG. 13B, and FIG. 14, when the detachment work for the detachment of the sheet pile member 23 is performed, it is preferable to combine the outer surface 23a of the exchange sheet pile member 23 downward. Steel sheet pile 1 placed On the ground 8. Thereby, the combined steel sheet pile 1 can be downloaded to the ground 8 in a stable state to control the deformation thereof.

Further, in general, when the joint bolt 41 and the joint nut 45 are loosened and removed from each other, the other side is maintained and fixed, and the other is rotated by using a tool such as a torque wrench. However, as described above, when the detachment work for the sheet pile member 23 for exchange is performed, it is difficult to insert and fix the joint bolt 41 and the joint nut 45 in the space 9 between the steel sheet pile 10 and the floor 8. Therefore, at this time, the fixing operation of fixing the one of the joint bolt 41 and the joint nut 45 positioned on the upper side of the combined steel sheet pile 1 placed on the floor 8 by spot welding or the like is required to be combined. The steel sheet pile 1 is reversed in the opposite direction. Further, usually, after the combined steel sheet pile 1 is pulled out from the ground, it is necessary to remove the adhered soil sand from the periphery of the joint bolt 41 and the joint nut 45. When the above-described reverse operation is performed, it is necessary to remove the soil sand from both the joint bolt 41 and the joint nut 45.

In the present embodiment, the combined steel sheet pile 1 type joint bolt 41 is fixed to the outer surface 23a of the exchange sheet pile member 23 in the present embodiment. When the detachment work for the sheet pile member 23 for the exchange is performed, the work can be performed only from the inner surface 23b side of the exchange sheet pile member 23 without performing the reverse operation of the combined steel sheet pile 1. In other words, one of the joint bolt 41 and the joint nut 45 can be loosened and detached from the other side, and the workability at the time of the detachment work can be improved. In addition, it is sufficient for the soil sand removing operation to be performed only for one of the joint bolts 41 and the joint nut 45. Therefore, from the viewpoint of this, workability can be improved. Further, the nut 45 may be joined to the outer surface 23a of the exchange sheet pile member 23 instead of the joint bolt 41, and the nut 45 may be used. The joint nut 45 is welded to the outer surface 23a of the exchange sheet pile member 23.

Further, when the bolt head portion 42 is disposed on the outer surface 23a side of the exchange sheet pile member 23, as shown in the drawing, when the combined steel sheet pile 1 is disposed, only the joint nut 45 which is smaller than the joint bolt 41 can be removed. In the state of the work, the detachment work of the sheet pile member 23 for exchange is performed. Therefore, it is possible to improve the workability in the disassembly work.

After the existing sheet pile member 23 is removed from the combined steel sheet pile 1, the existing sheet pile member 21 other than the exchange sheet pile member 23 is attached to the installed H-beam 30, and the combined steel sheet is reused. Pile 1. In the case of reusing the combined steel sheet pile 1, for example, the combined steel sheet pile 1 in a state in which the sheet pile member 23 for exchange has been removed is stored. When it is necessary to construct the underground continuous wall 3, the combined steel sheet pile 1 is transported to the site, and the new steel sheet pile 1 is attached to the combined steel sheet pile 1 for reuse. At this time, it is necessary to attach the new exchange sheet pile member 23 to the reused combination steel sheet pile 1, but the timing of the installation can be performed when the combined steel sheet pile 1 is stored, or after the combined steel sheet pile 1 is transported to the site. . Further, after the exchange sheet pile member 23 is removed from the combined steel sheet pile 1, the new exchange sheet pile member 23 is attached to the work site, and the combined steel sheet pile 1 is reused.

The method for recycling the combined steel sheet pile 1 in the above-described embodiment is summarized. In the present embodiment, the method of reusing the combined steel sheet pile 1 includes a step of pulling the combined steel sheet pile 1 constituting the underground continuous wall 3 from the ground, and removing the exchange sheet pile member 23 from the combined steel sheet pile 1 The above-described composite steel sheet pile 1 from which the exchange sheet pile member 23 has been removed is attached to the other exchange sheet pile member 23.

According to the present embodiment described above, it is possible to exchange only the particularly easy deformation and damage of the steel sheet pile 10, and when the composite continuous steel sheet pile 1 is reused to construct the underground continuous wall, it is possible to reduce the construction cost by controlling the amount of steel used.

Moreover, since the combined steel sheet pile 1 can be reused by only partially exchanging the steel sheet pile 10, it is possible to shorten the working time required for the disassembly work of the exchange sheet pile member 23. Moreover, since the exchange sheet pile member 23 can be exchanged by merely performing the detachment work of the joint bolt 41 by the joint bolt 41, it is possible to shorten the work time required for the detachment work of the exchange sheet pile member 23.

Moreover, the combined steel sheet pile 1 can be reused by transporting only the new exchange sheet pile member 23 to the storage place or the work site of the combined steel sheet pile 1. When the entire sheet pile member 23 for exchange is short in the total length of the combined steel sheet pile 1, the transporting and the like can be carried out by being superimposed, so that the workability at the time of the transport work can be improved.

Next, the appropriate dimensional conditions of the sheet pile member 23 for exchange in the present embodiment will be described.

The present inventors actually constructed the underground continuous wall 103 using, for example, the conventional combined steel sheet pile 101 shown in Figs. 26A and 27A, and then pulls out the combined steel sheet pile 101 constituting the underground continuous wall 103, and confirms that it has been pulled out. A confirmation experiment of the extent to which the steel sheet pile 110 of the steel sheet pile 101 is combined is deformed. In the confirmation experiment, the fitting property of the combined steel sheet pile 101, the full width W1 of the steel sheet pile 110 which most affects the workability, and the opening width W2 of the joint 111 of the steel sheet pile 110 are measured. For each of the measurement targets, the individual steel sheet piles 101 before the underground installation and the individual full width W1 and the opening width W2 after being pulled out from the ground were measured. In the confirmation experiment, as a combined steel sheet pile 101 The steel sheet pile 110 uses a hat-shaped steel sheet pile of a type 10H having a full width of 936 mm (effective width: 900 mm), an effective height of 230 mm, and a plate thickness of 10.8 mm. Further, in the confirmation experiment, the H-shaped steel 130 as the combined steel sheet pile 101 was used for the test body I having a beam height of 700 mm, a beam width of 200 mm, a web thickness of 9 mm, and a blade thickness of 16 mm, and a beam height of 900 mm was used. The test body II of a beam width of 250 mm, a web thickness of 16 mm, and a blade thickness of 19 mm was used for the confirmation experiment. Each of the steel sheet piles 10 of the experimental body I and the experimental body II has a length L0 of 15 m and 14.5 m in the longitudinal direction.

15A and 15B are views showing the relationship between the full width W1 obtained by the confirmation experiment and the distance from the upper end of the steel sheet pile 110. 16A and 16B are views showing the relationship between the joint opening width W2 and the distance from the upper end of the steel sheet pile 110. However, for the full width W1, after the drawing, a range of allowable +10 mm and -5 mm is adopted, that is, a reference within the range of 931 mm to 946 mm. Further, the allowable values are as shown in FIGS. 15A and 15B.

As shown in FIG. 15A and FIG. 15B, it is confirmed that the full width W1 of the upper end 110f or the lower end 110d in the longitudinal direction of the steel sheet pile 110 exceeds the above tolerance by performing the drawing and pulling out of the combined steel sheet pile 101. The value is then deformed. Further, as shown in FIG. 16A and FIG. 16B, it has been confirmed that the joint opening width W2 of the steel sheet pile 110 is significantly deformed in the longitudinal direction of the steel sheet pile 110 at the lower end 110d. In addition, in order to adjust the construction position or the inclination of the upper end 110f, the deformation is caused by the movement of the construction machine such as the maintenance vibrating machine, and the movement is caused in the horizontal direction. When the earth pressure of the soil entering the concave portion of the steel sheet pile 110 is expanded, there is a length L0 for the longitudinal direction of the steel sheet pile 110, from the upper end. At each end of 110f and lower end 110d, the tendency is generated closer to the end side at the position of 0.2 × L0. Therefore, although the ground conditions and the like are also affected, it is conceivable that the range of 0.2 × L0 at the respective ends of the end 110f and the lower end 110d mainly causes deformation exceeding the allowable value.

Based on these results, the appropriate length dimensions for the sheet pile member 23 for exchange are set to the conditions shown below. Specifically, as shown in FIG. 2A and FIG. 2B, the length L1 of the longitudinal direction of the sheet pile member 23 for exchange is preferably 0.2 times or less (20% or less) with respect to the length L0 of the longitudinal direction of the steel sheet pile 10. The length. Thereby, it is possible to leave a place where the steel sheet pile 10 is hard to be deformed (the sheet pile member 21), and exchange only the place where it is easily deformed (the sheet pile member 23 for exchange), so that when the combined steel sheet pile 1 is reused, The amount of steel used is controlled more effectively, and the lower limit of the length L1 is not particularly limited. However, when the length L1 is less than 50 cm, deformation of the sheet pile member 23 for exchange tends to occur, and the shape tends to be poor. Therefore, from the viewpoint of controlling the above deformation, the length L1 should preferably be 50 cm or more. In other words, the length L1 of the longitudinal direction of the sheet pile member 23 for exchange is preferably 50 cm or more, and is 0.2 times or less (20% or less) with respect to the length L0 of the longitudinal direction of the steel sheet pile 10. Further, for example, the steel sheet pile 10 has a length L0 of 10 m to 50 m in the longitudinal direction.

Further, when the sheet pile member 23 for exchange is provided on both the upper end portion 10a and the lower end portion 10b of the steel sheet pile 10, the sheet pile member 23 for exchange between the upper end portion 10a and the lower end portion 10b is preferably formed as an individual longitudinal direction. The length L1 is approximately the same length. Thereby, the same exchange sheet pile member 23 can be used for each end of the upper end portion 10a and the lower end portion 10b of the steel sheet pile 10, and the exchange board can be easily performed. Management of the pile member 23.

Next, the other features of the steel sheet pile 1 in combination in the present embodiment will be described.

As shown in FIG. 3B and FIG. 4B, the H-shaped steel 30 is preferably perforated with a plurality of bolt insertion holes 34 at the end portion 33a of the flap 33 (H-shaped steel flap) which is overlapped by the sheet pile member 23 for exchange. When the plurality of bolt insertion holes 34 are used to join the new exchange sheet pile member 23 to the H-section steel 30, the number of the joint bolts 41 for bolting is set to be within the number of the plurality of bolt insertion holes 34. Adjustment. Therefore, the joint strength of the sheet pile member 23 for exchange of the H-beam 30 can be adjusted. Specifically, the combined steel sheet pile 1 has a plurality of joint bolts 41 and a joint nut 45, and the H-shaped steel 30 has a plurality of bolt insertion holes 34 through which the joint bolts 41 for joining the sheet pile members 23 to the flaps 33 are inserted. The number of the engaging bolts 41 and the engaging nut 45 is smaller than the number of the bolt insertion holes 34, and the number of the engaging bolts 41 and the engaging nut 45 is preferably adjusted within the range of the number of the bolt insertion holes 34. The strength of the joined H-beam 30 and the exchange sheet pile member 23 is adjusted. Thereby, when the new exchange sheet pile member 23 is bolted to the H-shaped steel 30, the necessary joint strength is ensured without inserting the through hole 34 into the H-shaped steel 30 through-hole bolt.

In other words, when the steel sheet pile 1 is used for the first time, for example, six joint bolts 41 are required to secure the necessary joint strength, and when the joint steel sheet pile 1 is used for the second time, eight joint bolts 41 are required in order to secure the necessary joint strength. . At this time, if the end portion 33a of the flap 33 of the H-beam 30 is previously pierced with eight or more bolt insertion holes 34, the new bolt can be not pierced for the H-shaped steel 30 for the first time and the second time. In the case of inserting the through hole 34, it is necessary to ensure Bonding strength.

From the above point of view, it is preferable that the plurality of bolt insertion holes 34 are as small as possible for the interval of the plurality of bolt insertion holes 34, and the root of the joint bolt 41 used for joining the H-beam 30 and the exchange sheet pile member 23 is used. The number and location can be varied according to various factors.

Therefore, in the present embodiment, the plurality of bolt insertion holes 34 are formed in a row at a substantially constant interval in the longitudinal direction, and the column-shaped bolt insertion holes 34 are perforated in a plurality of rows. At this time, as shown in FIG. 17A, the joint bolts 41 inserted through the plurality of bolt insertion holes 34 may be arranged in a row in the width direction of the steel sheet pile 10, and inserted in the longitudinal direction. The through holes 34 are inserted through bolts at equal intervals. Further, as shown in Fig. 17B, the joint bolts 41 may be inserted so as not to be adjacent to each other in the plate width direction of the steel sheet pile 10, and the bolt insertion holes 34 to be used are staggered into a thousand birds (configured to each other in a plurality of columns) Different states).

In addition, when the joint strength (the underground continuous wall 3) is temporarily provided by the construction of the combined steel sheet pile 1, the upper end portion 10a or the lower end portion 10b of the steel sheet pile 10 can sufficiently resist the earth pressure, The bending moment of the hydraulic pressure or the joint strength of the shear force. This bending moment or shear force is derived by design or the like. The bending moment or the shearing force can be changed into various forms depending on the ground conditions around the combined steel sheet pile 1 under the ground or the structural conditions of the struts 7 and the like. For example, in the present embodiment, when the underground continuous wall 3 is used as a truss retaining wall, the bending moment acting on each end of the upper end portion 10a and the lower end portion 10b of the steel sheet pile 10 becomes small, and H type steel is often used only. The rigidity of 30 can resist the situation of earth pressure. Therefore, as in the above case, the joint snail can be adjusted. The number of the plugs 41 is such that the joint strength of the H-beam 30 is not released from the sheet pile member 23 for exchange.

As shown in FIG. 18A to FIG. 18C, from the viewpoint of adjusting the joint strength of the sheet pile member 23 for exchange of the H-shaped steel 30, it is possible to adopt the cross-exchange sheet pile member 23 and the other adjacent thereto. The structure of the reinforcing plate 61 is erected on one side or both sides of the sheet pile member 21. Thereby, since the integration of the sheet pile member 23 for exchange and the other sheet pile members 21 can be improved, the cross-sectional performance of the entire section of the steel sheet pile 1 can be expected for the portion to which the sheet pile member 23 for exchange is attached. . Further, as described above, in the case of the continuous underground wall 3 constituted as shown in Figs. 9A and 9B, in the case where the boundary portion 74 between the adjacent combined steel sheet piles 1 is discontinuous, the boundary portion 74 and the adjacent combined steel sheet pile Since the joint 11 of 1 is fitted, the joint strength of the upper end portion 10a or the lower end portion 10b can be suitably increased.

The reinforcing plate 61 is made of a metal material such as a steel material or a synthetic resin material. In the modification of the embodiment shown in FIGS. 18A to 18C, the reinforcing plate 61 is mounted on both surfaces of the pair of exchange sheet pile members 23 and the other sheet pile members 21 which are adjacent to each other in the longitudinal direction. As shown in the figure, the reinforcing plate 61 is joined by bolting or joined to the sheet pile member 23 for exchange or the other sheet pile member 21 by a welded portion W such as fillet welding.

[Second Embodiment]

Next, the steel sheet pile 1 will be described in combination with the second embodiment. The same components as those described above are denoted by the same reference numerals, and the description below will be omitted.

As shown in FIG. 19 to FIG. 21B, the steel sheet pile 1 is combined in this embodiment. A water stop layer 71 (expandable water stop material 72) is provided at a boundary portion 74 between the exchange sheet pile member 23 and the other sheet pile member 21 adjacent thereto. Specifically, between the exchange sheet pile member 23 and the sheet pile member 21 (the boundary portion 74), a water stop layer 71 including the expandable water stop material 72 is provided. The water stop layer 71 is provided by applying the intumescent water stop material 72 to either or both of the opposing facing faces 22 of the exchange sheet pile member 23 and the other sheet pile members 21 adjacent thereto. The expandable water stop material 72 is, for example, a urethane resin as a main component, and can be expanded by absorbing moisture in the ground to exhibit a high water repellency.

Therefore, when the underground continuous wall 3 is constructed, even if there is a water table 73 above the boundary portion 74 between the sheet pile member 21 and the exchange sheet pile member 23, the water stop layer 71 can be used to prevent the boundary portion from being used. 74 leaks.

From the above-mentioned point of view, when the water-retaining layer 71 is used as the temporary retaining wall in the present embodiment, the complex boundary between the sheet pile member 21 and the exchange sheet pile member 23 which cause water leakage occurs. Only the portion exposed to the excavation side is provided in the portion 74. As an example shown in FIG. 19, the water stop layer 71 may be provided only to the boundary portion 74 on the side of the upper end portion 10a in the two boundary portions 74 which are present in the longitudinal direction.

[Third embodiment]

Next, the steel sheet pile 1 will be described in combination with the third embodiment.

As shown in Fig. 22, in the present embodiment, the structure of the fitting hole 53 of the steel sheet pile 1 fixing mold 51 is different from that of the steel sheet pile 1 of the first embodiment. In the present embodiment, the fitting hole 53 of the fixed mold 51 has a bolt shaft through which the joint bolt 41 is inserted in order from the H-shaped steel 30 side in the penetration direction of the fitting hole 53 toward the exchange sheet pile member 23 side. The diameter hole portion 53a of the portion 43 The large diameter hole portion 53b having a larger diameter than the small diameter hole portion 53a and the hole bottom surface 53c formed between the small diameter hole portion 53a and the large diameter hole portion 53b. The large diameter hole portion 53b is inserted into the bolt head portion 42 or the joint nut 45 of the joint bolt 41, and the inner peripheral surface thereof is formed to be engageable with the bolt head portion 42 of the joint bolt 41 or the outer peripheral surface of the joint nut 45. . When either one of the joint bolt 41 or the joint nut 45 is screwed to the other side, the hole bottom surface 53c abuts against the bottom surface of either the bolt head 42 or the joint nut 45 of the joint bolt 41. Thereby, the mold 51 can be sandwiched and fixed between one of the bolt head 42 or the joint nut 45 of the joint bolt 41 and the exchange sheet pile member 23 by locking one of the joint bolt 41 and the joint nut 45. Thereby, it is not necessary to join the fixed mold 51 to the outer surface 23a of the exchange sheet pile member 23 by welding, adhesion, magnetic connection or the like.

[Fourth embodiment]

Next, the steel sheet pile 1 will be described in combination with the fourth embodiment.

As shown in FIG. 23A and FIG. 23B, in the present embodiment, the combined steel sheet pile 1 H-shaped steel 30 and the exchange sheet pile member 23 are joined by the welded portion W. Specifically, the combined steel sheet pile 1 further has a welded portion W that joins the H-shaped steel 30 and the exchange sheet pile member 23. Only this joining method is different from the combined steel sheet pile 1 in the first embodiment. Other points are, for example, a method of exchanging the damaged exchange sheet pile member 23 from the combined steel sheet pile 1, or constructing the underground continuous wall 3 using the combined steel sheet pile 1, or pulling the combined steel sheet pile 1 from the underground continuous wall 3 The method of reuse and the like are the same as those in the first embodiment described above. In order to exchange the damaged exchange sheet pile member 23 from the combined steel sheet pile 1, the exchange sheet pile member 23 is removed from the H-beam 30 by cutting the welded portion W from the end portion in the longitudinal direction to the boundary portion 74. Therefore, it is not necessary to perform the sheet pile member 23 for exchange. The perforation of the bolt insertion hole 34 with the H-shaped steel 30. Further, it is not necessary to fix the fixed mold 51 or the like by welding to the exchange sheet pile member 23, and it is not necessary to lock the joint bolt 41 and the joint nut 45. As described above, the above-described required working time can be shortened. In addition, in FIG. 23A and FIG. 23B, the joint of the sheet pile member 21 with the sheet pile member 23 for exchange and the H-shaped steel 30 is continuously welded to the boundary portion 74 with respect to the longitudinal direction of the combined steel sheet pile 1. An example. Further, the joining of the sheet pile member 21 to the exchange sheet pile member 23 and the H-shaped steel 30 may be intermittently welded to the boundary portion 74 with respect to the longitudinal direction of the combined steel sheet pile 1.

[Fifth Embodiment]

Next, the steel sheet pile 1 will be described in combination with the fifth embodiment.

Fig. 24A is a plan view showing the underground continuous wall 3 in which the steel sheet pile 1 is combined in the fifth embodiment of the present invention. Figure 24B is a front elevational view of the underground continuous wall 3 shown in Figure 24A. The composite steel sheet pile 1 of the present embodiment has a steel sheet pile 10 of a cold-rolled steel sheet pile formed by cold rolling. According to the first embodiment described above, the steel sheet pile 10 cannot be formed into a complicated shape of a heat-expanded steel sheet pile formed by hot-rolling with high shape imparting property. However, in the present embodiment, a cold-rolled steel sheet pile which can be manufactured by a simple apparatus can be used as the steel sheet pile 10. Further, in the present embodiment, each modification of the first embodiment described above can be applied. Further, the exchanged sheet pile member 23 of the combined steel sheet pile 1 or the method of constructing the underground continuous wall 3 using the combined steel sheet pile 1 or the combined steel sheet pile 1 is pulled out from the underground continuous wall 3 for reuse. The method and the like are the same as those in the first embodiment described above. .

[Sixth embodiment]

Figure 25A shows a combination steel sheet pile in a sixth embodiment using the present invention. A plan view of the underground continuous wall 3 of 1. Figure 25B is a plan view showing an enlarged steel sheet pile 1 for the underground continuous wall 3 shown in Figure 25A. As shown in Fig. 25B, in the present embodiment, the steel sheet pile 10 has two Z-shaped steel sheet piles 10x, and is fitted to the joint 11y of the other Z-shaped steel sheet pile 10x by the joint 11x of one of the Z-shaped steel sheet piles 10x. It is constituted by a hat-shaped steel sheet pile having a hat shape when viewed in a cross section perpendicular to the longitudinal direction. When the Z-shaped steel sheet pile 10x is viewed in the above-described cross section, the joint 11x at both end portions in the sheet width direction and the joint 11y are not in the same shape. The other Z-shaped steel sheet pile 10x is reversed with respect to one of the Z-shaped steel sheet piles 10x, and the steel sheet pile 10 having a hat shape is formed by fitting the joints 11x and the joints 11y to each other. This embodiment can also be applied to each modification of the above-described first embodiment. Further, the exchanged sheet pile member 23 of the combined steel sheet pile 1 or the method of constructing the underground continuous wall 3 using the combined steel sheet pile 1 or the combined steel sheet pile 1 is pulled out from the underground continuous wall 3 for reuse. The method and the like are the same as those in the first embodiment described above. .

The above-described embodiments are described in detail, but the above embodiments are merely illustrative of the embodiments of the present invention, and the scope of the technology of the present invention is not limited thereto.

[Example 1]

Next, the effects of the above aspects of the present invention will be described using the embodiments.

In this embodiment, it is used as shown in FIG. 26A and FIG. 27A. An example of a conventional steel sheet pile 101 (hereinafter referred to as a comparative example) and an example of using a combined steel sheet pile 1 shown in FIGS. 1A to 2B (hereinafter referred to as an invention example) are investigated regarding the steel sheet pile 10 and 110 steel in reverse exchange Dosage. The combination steel sheet piles 1 and 101 used in both the comparative example and the invention example are used as the steel sheet piles 10 and 110, and a hat shape of a type 10H having a full width of 936 mm (effective width: 900 mm), an effective height of 230 mm, and a plate thickness of 10.8 mm is used. Sheet pile. Further, as the H-section steels 30 and 130, a beam height of 700 mm, a beam width of 200 mm, a web thickness of 9 mm, a blade thickness of 19 mm, and a length of 18 mm in the longitudinal direction were used. In the steel sheet pile 10 used in the invention, the longitudinal direction length L1 of the exchange sheet pile member 23 in which both the upper end portion 10a and the lower end portion 10b of the steel sheet pile 10 are used is formed to be 20% of the longitudinal direction length L0 of the steel sheet pile 10 ( 0.2 times).

For each of the examples of the invention and the comparative example, a total of four exchange operations were performed. In the example of the invention, the conditions for exchanging the exchange sheet pile member 23 between the upper end portion 10a and the lower end portion 10b of the steel sheet pile 10 (hereinafter referred to as Invention Example 1) and the lower end portion of only the steel sheet pile 10 are exchanged for each exchange operation. The amount of steel used was investigated under the conditions of the condition of the sheet pile member 23 for exchange of 10b (hereinafter referred to as Invention Example 2). In the comparative example, in each exchange operation, the amount of steel used was investigated by exchanging the condition of the steel sheet pile 110 of the combined steel sheet pile 101.

Table 1 shows the cumulative steel use amount of each of the inventive examples 1 and the comparative examples. Table 2 shows the cumulative steel material usage amount of each of the inventive examples 2 and the comparative examples.

As shown in Table 1, in the case of reuse for a total of four times, the inventive example 1 can reduce the cumulative steel use amount by 31% compared with the comparative example. Further, as shown in Table 2, in the case of exchanging only the exchange sheet pile member 23 of the lower end portion 10b of the steel sheet pile 10, the inventive example 2 can reduce the cumulative steel material usage amount by 42% as compared with the comparative example. From the above results, it has been confirmed that the above-described aspect of the present invention can significantly suppress the amount of steel used when the combined steel sheet pile 1 is reused.

Industrial availability

According to the above aspect of the present invention, it is possible to provide a combined steel sheet pile which can exchange only the steel sheet pile which is particularly easy to be deformed and damaged, and the ground thereof Since the continuous wall and the combined steel sheet pile are reused, the industrial availability is very high.

1, 101‧‧‧ combination steel sheet pile

3, 103‧‧‧ Underground continuous wall

5‧‧‧Underground structures

7‧‧‧Support beam

8‧‧‧ Ground

10, 110‧‧ ‧ steel sheet pile

11, 111, 11x, 11y‧‧‧ joints

10a, 10f, 110f‧‧‧ upper end of steel sheet pile 10

10b, 10d, 110d‧‧‧ lower end of steel sheet pile 10

10e‧‧‧ middle section of steel sheet pile 10

10H‧‧‧hat-shaped steel sheet pile

10x‧‧‧Z-shaped steel sheet pile

11x, 11y‧‧‧z-shaped steel sheet pile 10x joint

13‧‧‧ web section (steel sheet pile web section)

15‧‧‧ wing (steel sheet pile wing)

16‧‧‧ recess

17‧‧‧ Arms

21‧‧‧Sheet members

23‧‧‧ exchange sheet pile members

23x, 23y‧‧‧ exchange sheet pile members

23a‧‧‧Outside side of the sheet pile member 23 for exchange

23b‧‧‧Inside side of the sheet pile member 23 for exchange

30, 130‧‧‧H-beam

31‧‧‧ web section (H-shaped steel web section)

33‧‧‧ wing (H-shaped steel wing)

34‧‧‧Bolt insertion hole

41, 141‧‧‧ joint bolt

42‧‧‧Bolt head

43‧‧‧Bolt shaft

45, 145‧‧‧ joint nut

51‧‧‧Fixed fixture

53‧‧‧ fitting holes

53a‧‧‧Small hole

53b‧‧‧ Large diameter hole

53c‧‧‧ hole bottom

61‧‧‧ reinforcing plate

71‧‧‧ water stop

72‧‧‧Expandable water stop

73‧‧‧water table

74‧‧‧Borders

Longitudinal length of L0‧‧‧ steel sheet pile 110

L1‧‧‧ Length of the longitudinal direction of the sheet pile member 235 for exchange

W‧‧‧welding department

Full width of W1‧‧‧ steel sheet pile 110

Opening width of W2‧‧‧ joint 111

Fig. 1A is a plan view showing a combined steel sheet pile in a first embodiment of the present invention.

Figure 1B is a partial cross-sectional plan view showing an enlarged portion of Figure 1A.

Fig. 2A is a front elevational view showing a combined steel sheet pile in the first embodiment.

Figure 2B is a partial cross-sectional rear view of Figure 2A.

Fig. 3A is a front elevational view showing the upper end portion of the steel sheet pile in the first embodiment;

Fig. 3B is a partial cross-sectional rear view of the upper end portion of Fig. 3A.

Fig. 4A is a front elevational view showing a sheet pile member for exchange of a steel sheet pile in a first embodiment;

Fig. 4B is a front elevational view showing the upper end portion of the combined steel sheet pile in the state in which the sheet pile member for exchange is removed from the H-shaped steel of Fig. 4A.

Fig. 5A is a plan view showing a subterranean continuous wall constructed by combining steel sheet piles in the first embodiment.

Figure 5B is a front elevational view of the underground continuous wall of Figure 5A.

Fig. 6 is a side view schematically showing the underground continuous wall constructed by using the steel sheet pile in the first embodiment.

Fig. 7 is a plan view schematically showing a subterranean continuous wall constructed by using a U-shaped steel sheet pile as a steel sheet pile of a steel sheet pile in the first embodiment.

Fig. 8 is a plan view showing a combined steel sheet pile in which a flap of an H-beam is superposed and joined to a single side of a concave portion side formed by a web portion of a steel sheet pile and a pair of fins.

Fig. 9A is a plan view showing a subterranean continuous wall constructed by combining steel sheet piles in a modification of the first embodiment.

Figure 9B is a front elevational view of the underground continuous wall of Figure 9A.

Fig. 10A is a side view schematically showing a subterranean continuous wall which has been constructed using a combination steel sheet pile which is provided only for the lower end portion of the steel sheet pile.

Fig. 10B is a side view schematically showing a subterranean continuous wall which has been constructed using a combination steel sheet pile which is provided only with an upper sheet pile member for the upper end portion of the steel sheet pile.

Fig. 11A is a plan view showing a combined steel sheet pile in a modified form of the first embodiment.

Figure 11B is a partial cross-sectional plan view showing an enlarged portion of Figure 11A.

Fig. 12 is a view schematically showing a subterranean structure constructed by combining steel sheet piles according to the first embodiment.

Fig. 13A is a side view schematically showing a state in which the steel sheet pile of the first embodiment is placed on the ground.

Fig. 13B is an exploded side view schematically showing a state in which the sheet pile member for exchange has been removed from the steel sheet pile of Fig. 13A.

Fig. 14 is a view showing a state in which the joint nut is removed from the joint bolt of the steel sheet pile in the first embodiment.

Fig. 15A is a graph showing the relationship between the full width of the steel sheet pile obtained by the confirmation experiment and the distance from the upper end of the steel sheet pile.

Fig. 15B is a graph showing the relationship between the full width of the steel sheet pile obtained by the confirmation experiment and the distance from the upper end of the steel sheet pile.

Fig. 16A is a view showing the relationship between the joint opening width of the steel sheet pile obtained by the confirmation experiment and the distance from the upper end of the steel sheet pile.

Fig. 16B is a view showing the relationship between the joint opening width of the steel sheet pile obtained by the confirmation experiment and the distance from the upper end of the steel sheet pile.

Fig. 17A is a partial cross-sectional rear view showing a state in which eight joint bolts have been used for joining the H-beam and the sheet pile member for exchange.

Fig. 17B is a partial cross-sectional rear view showing a state in which six joint bolts have been used for joining the H-beam and the sheet pile member for exchange.

Fig. 18A is a plan view showing a state in which a reinforcing plate is placed between the sheet pile member for exchange which has traversed the combined steel sheet pile and the sheet pile member adjacent thereto.

Figure 18B is a front elevational view of the upper end portion of the composite steel sheet pile of Figure 18A.

Figure 18C is a rear elevational view of the upper end portion of the composite steel sheet pile of Figure 18A.

Fig. 19 is a side view schematically showing the underground continuous wall which has been constructed using the combined steel sheet pile in the second embodiment.

Fig. 20 is a front elevational view showing the upper end portion of the combined steel sheet pile in the second embodiment.

Fig. 21A is a front elevational view showing a sheet pile member for exchange of steel sheet piles in a second embodiment;

Fig. 21B is a front elevational view showing the upper end portion of the combined steel sheet pile in a state in which the sheet pile member for exchange of Fig. 21A has been removed from the H-shaped steel.

Fig. 22 is a partial cross-sectional plan view showing a fixing mold used for combining steel sheet piles in the third embodiment.

Fig. 23A is a plan view showing a combined steel sheet pile in the fourth embodiment.

Figure 23B is a rear elevational view of the upper end portion of the composite steel sheet pile of Figure 23A.

Fig. 24A is a plan view showing a continuous underground wall constructed by combining steel sheet piles in the fifth embodiment.

Figure 24B is a front elevational view of the underground continuous wall of Figure 24A.

Fig. 25A is a plan view showing a subterranean continuous wall constructed by combining steel sheet piles in the sixth embodiment.

Figure 25B is a plan view showing the expansion of the combined steel sheet pile used in the underground continuous wall shown in Figure 25A.

Fig. 26A is a plan sectional view showing an example of a conventional combined steel sheet pile.

Fig. 26B is a plan sectional view showing another example of a conventional combined steel sheet pile.

Fig. 27A is a side view schematically showing a subterranean continuous wall which has been constructed using a combined steel sheet pile as a conventional example.

Fig. 27B is a side view schematically showing a subterranean continuous wall which has been constructed using a combined steel sheet pile as another conventional example.

8‧‧‧ Ground

21‧‧‧Sheet members

23‧‧‧ exchange sheet pile members

30‧‧‧H-beam

41‧‧‧Joint bolt

45‧‧‧Joint nut

Claims (9)

A steel sheet pile having a steel sheet pile and an H-shaped steel, wherein the steel sheet pile has a plurality of sheet pile members vertically divided in a longitudinal direction; and the front plate of at least one end portion of the longitudinal direction The pile member is a sheet pile member for exchange which is detachable from the aforementioned H-shaped steel. The composite steel sheet pile according to the first aspect of the invention, wherein the steel sheet pile has a pair of steel sheet pile wing portions provided at both ends of the web portion when viewed in a cross section perpendicular to the longitudinal direction. An arm portion at a front end of the steel sheet pile flap portion and a joint provided at a front end of the arm portion, and having a hat-shaped hat-shaped steel sheet pile. The combined steel sheet pile according to the first or second aspect of the invention, wherein the length of the longitudinal direction of the sheet pile member for exchange is 50 cm or more, and the length in the longitudinal direction of the steel sheet pile is 0.2 times or less. The composite steel sheet pile according to claim 3, further comprising a joint bolt for joining the H-shaped steel and the exchange sheet pile member. The composite steel sheet pile according to claim 4, which has a plurality of the joint bolts; the H-shaped steel has a plurality of bolt insertion holes, and the bolt insertion holes are inserted to join the exchange sheet pile member The aforementioned joint bolt of the H-shaped steel wing portion; further, the number of the aforementioned joint bolts is smaller than the number of the bolt insertion holes. The composite steel sheet pile according to claim 3, further comprising a welded portion that joins the H-shaped steel and the exchange sheet pile member. The composite steel sheet pile according to the third aspect of the invention, wherein the water exchange layer including the expandable water stop material is provided between the exchange sheet pile member and the sheet pile member. An underground continuous wall comprising a composite steel sheet pile according to the first or second aspect of the patent application, and the joints of the respective combination steel sheet piles adjacent to each other are connected to each other to be constructed. A method for recycling a combined steel sheet pile, characterized in that the combination steel sheet pile constituting the underground continuous wall as described in claim 8 of the patent application is pulled out from the ground; and the exchange is removed from the combined steel sheet pile a sheet pile member; and the other combination sheet pile member to which the above-described combination steel sheet pile from which the exchange sheet pile member has been removed is attached.