JP2006322229A - Steel sheet pile with nut and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dispense with welding work for the connection of an anchoring material after the insertion of a steel sheet pile, when the anchoring material such as an anchor bar is connected to the steel sheet pile for being used as an earth retaining wall and a sheathing board of a structure, in the construction of the structure of the reinforced concrete in the ground. <P>SOLUTION: This steel sheet piles are inserted into the ground while adjoining each other in the circumferential direction of the structure 5 constructed from the reinforced concrete, so as to enclose the structure 5 to be constructed in the ground. An end surface of a nut 3 is prewelded to a surface, facing the side of the structure 5, of a steel sheet pile body 2 constituting the steel sheet pile. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a steel sheet pile with a nut that is used as a retaining wall and a structural plate when constructing a reinforced concrete structure such as a footing in the ground, and is inserted into the ground using a press-fitting machine, and the like. It is related with the construction method of the steel sheet pile with a nut using it.

When constructing a reinforced concrete structure such as a footing in the ground, a steel sheet pile that also serves as a shearing force transmission member to the ground and the ground is inserted in the ground while retaining the mountain. After discharging the earth and sand in the region surrounded by the steel sheet piles, reinforcing bars are placed and concrete is placed (see Patent Document 1).
In this case, in order to transmit the tensile force from the concrete due to the bending moment acting on the structure to the steel sheet pile, the reinforcing bars such as anchor bars are directly or indirectly applied to the inner peripheral surface (surface on the structure side) of the steel sheet pile. There is a case of connection (see Patent Document 2).

JP 2003-138777 A (paragraphs 0041-0045, FIG. 3) JP 2002-013134 A (Claim 1, paragraphs 0035 to 0065, FIGS. 1 to 3, FIGS. 7 to 10)

When connecting reinforcing bars such as anchor bars directly to steel sheet piles, welding is performed, but steel sheet piles must be inserted into the ground while the sheet pile is gripped with a press-fitting machine or a vibrator hammer hammer chuck. Therefore, the fixing material cannot be welded before the steel sheet pile is inserted, and welding must be performed after the steel sheet pile is inserted.
Therefore, since welding is a work in the ground, workability is extremely reduced, and welding is performed along a vertical plane. Therefore, there is a problem that welding is caused and reliability of the welding itself is also lowered.

  The present invention provides a steel sheet pile with a nut that eliminates the need for welding work after insertion of the steel sheet pile when connecting a fixing material such as an anchor bar to the steel sheet pile main body, and construction of a steel sheet pile with a nut using the same. A method is proposed.

  The steel sheet pile with a nut according to claim 1 is a steel sheet pile inserted into the ground while adjacent to the circumferential direction so as to surround a reinforced concrete structure to be built in the ground. It is set as a constituent requirement that the nut is welded to the surface of the steel sheet pile main body constituting the structure facing the structure side. The nut has a length sufficient to transmit a tensile force from the fixing material by screwing of the fixing material, such as a long nut or a coupler.

  A nut is preliminarily welded to the surface of the steel sheet pile body facing the structure side, that is, before the steel sheet pile body is completely inserted into the ground, so that a male screw is formed after the steel sheet pile body is inserted. Fixing materials such as anchor bars can be connected by screwing. As a result, there is no welding work for joining the fixing material after the steel sheet pile main body is inserted, the problem of workability deterioration when relying on welding is solved, and the problem of reliability reduction is also solved. Since the fixing material is connected to the nut only by screwing, the workability and work efficiency are improved compared to the case of welding, the work period is shortened, and the reliability of the joined state is also improved.

  The steel sheet pile main body has a groove-shaped cross section having a web and a flange, and the adjacent steel sheet pile main bodies are connected to each other with the convex side of the web alternately facing the ground mountain side and the root cutting (structure) side. The structure side to be constructed of the steel sheet pile main body may be the convex side or the concave side of the web. Therefore, as a steel sheet pile with a nut, at least any one of the form which welded the nut to the convex surface side of the steel sheet pile main body, and the form which welded the nut to the concave surface side is prepared.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, in particular, the nut is welded at or near the center in the width direction of the steel sheet pile main body.

  A chuck 7 of a press-fitting machine 6 used for inserting a steel sheet pile with a nut comprises a movable part 71 and a receiving part 72 that move to the steel sheet pile side when gripping the steel sheet pile as shown in FIGS. An inlet (about 70 mm × 70 mm or more) 72a for a water jet combined use method or a grout injection combined method is provided at each widthwise central portion of the receiving portion 72 on the convex side of the sheet pile main body 2 and the movable portion 71 on the concave side. 71a are formed, and the inlets 72a and 71a are not blocked even when the chuck 7 grips the steel sheet pile main body 2. 5 shows the chuck in a state where the steel sheet pile main body 2 is not gripped, and FIG. 6 shows the chuck in a state where the steel sheet pile main body 2 is gripped.

  Therefore, using the space of each of the inlets 71a and 72a of the movable portion 71 and the receiving portion 72, a nut having a length that fits in the space is welded to the central portion in the width direction of the steel sheet pile main body or in the vicinity thereof. Thus, it becomes possible to insert the steel sheet pile with a nut into the ground using a press-fitting machine with less vibration.

  When the nut does not fit in one inlet 71a (72a), the nut of the steel sheet pile main body is penetrated to weld the nut, thereby giving the nut twice the length of the one inlet. Therefore, it is possible to give the nut a sufficient length to transmit the tensile force from the fixing material while being accommodated in the injection port 71a (72a).

  The steel sheet pile with a nut according to claim 3 is a steel sheet pile inserted into the ground while adjacent to the circumferential direction so as to surround a reinforced concrete structure to be built in the ground. The perforated steel sheet to which the nut is welded is welded to the surface of the steel sheet pile main body constituting the structure facing the structure side. Also in this case, the nut has a length sufficient to transmit the tensile force from the fixing material by screwing of the fixing material.

  The nut is welded to the end face of the perforated steel sheet, etc., and the perforated steel sheet to which the nut is welded is welded to the surface facing the structure side of the steel sheet pile body, and the steel sheet pile is inserted using a vibro hammer. Although it is performed, it is equivalent to the case where the nut is directly welded to the steel sheet pile main body in connection of the fixing material, and the anchor bar in which the male screw is formed after the steel sheet pile main body is inserted in the same manner as in claim 1. Or the like can be connected by screwing. As a result, the welding work after the steel sheet pile main body is inserted is eliminated, the problem of workability deterioration when relying on welding is solved, and the problem of reliability reduction is also solved. Further, since the fixing material is connected to the nut only by screwing, the workability and work efficiency are improved as compared with the case of welding, the work period is shortened, and the reliability of the joined state is also improved. The nut of the steel sheet pile with a nut according to claim 1 and the nut of the perforated steel sheet to which the nut is welded are placed on the same line after insertion into the ground of the steel sheet pile with a nut, By screwing the formed fixing material such as anchor bars, the perforated steel sheet and the fixing material can be simultaneously connected to the steel sheet pile with nuts. In this case, the steel sheet pile with nuts can be inserted into the ground using a press-fitting machine.

  In claim 3, since the perforated steel sheet is welded to the steel sheet pile main body in advance, it is not necessary to weld the perforated steel sheet after inserting the steel sheet pile with nuts and discharging the earth and sand. Since the work for transmitting the vertical shearing force from the concrete to the steel sheet pile main body does not occur, the number of work in the ground is reduced and the work efficiency is improved. The nut is not necessarily welded to the steel sheet pile main body because the perforated steel plate is welded. Since the perforated steel sheet is welded to the steel sheet pile main body on the ground before the insertion of the steel sheet pile with a nut, welding may be performed with the steel sheet pile main body laid down, and the problem of welding droop does not occur.

  Further, since the fixing material can be engaged with and connected to the hole of the perforated steel plate, a large number of fixing materials can be connected by welding one perforated steel plate to which the nut is welded. Yes, it is also possible to freely set the number of fixing materials to be connected by adjusting the length of the perforated steel sheet and welding nuts to the upper and lower ends of the perforated steel sheet.

  The invention according to claim 4 is characterized in that the steel sheet pile with a nut according to claim 1 or 2 is grounded while adjoining in the circumferential direction so as to surround a reinforced concrete structure to be built in the ground. It is inserted into, and after discharging the earth and sand inside the region surrounded by the steel sheet pile with nut, the fixing material in which a male screw is formed from one side is connected to the nut of the steel sheet pile with nut. It is a construction method of the steel sheet pile with a nut.

  Since the nut is welded at the stage before the steel sheet pile main body is inserted into the ground, the fixing material is welded in the ground in order to take over the benefits of the invention of claim 1. In addition, the joining operation is simplified, the reliability of integration of the perforated steel sheet into the steel material is increased, and the work period is shortened.

  The invention according to claim 5 is the structure of the steel sheet pile main body while inserting the steel sheet pile main body into the ground while adjoining the circumferential direction so as to surround the reinforced concrete structure to be built in the ground. A steel sheet pile with a nut according to claim 1 or 2 is manufactured by welding a nut to the surface facing the object side at the end face thereof, and the earth and sand inside the region surrounded by the steel sheet pile with the nut is discharged. Then, it is a construction method of the steel sheet pile with a nut which makes it a constituent requirement to connect the fixing material in which the external thread was formed from one side to the nut of the steel sheet pile with a nut.

  Claim 5 is a method of welding the nut in the process of inserting the steel sheet pile main body into the ground, and during the insertion of one steel sheet pile main body, the chuck of the press-fitting machine and the vibro hammer is detached from the steel sheet pile main body, and for one stroke, When ascending, a nut is welded on the ground below the chuck to form a steel sheet pile with a nut, and the steel sheet pile with a nut is inserted into the ground as it is.

  In claim 5, welding work is required in the process of inserting the steel sheet pile main body into the ground, but since welding is performed on the ground, joining work is easier than in the case of welding in the ground, and the construction period is shortened. Have a profit to be realized. In this case, the nut is welded to the position where the chuck has passed, that is, the position below the chuck, so that the interference between the nut and the chuck does not occur. In contrast, the nuts can be freely arranged.

  The invention according to claim 6 inserts the steel sheet pile with a nut according to claim 3 into the ground while adjoining the circumferential direction so as to surround a reinforced concrete structure to be built in the ground, After discharging the earth and sand inside the region surrounded by the steel sheet pile with nuts, the steel with nuts, which comprises connecting the fixing material in which a male screw is formed from one side to the nuts of the steel sheet piles with nuts. It is a construction method of a sheet pile.

  Since claim 6 is a method of inserting a steel sheet pile with a nut, to which a perforated steel plate is welded in advance, into the ground, in order to take over the benefits of the invention of claim 3, it is more joined than when welding in the ground. The work is simplified, the reliability of integration of the perforated steel sheet into the steel material is increased, and the construction period is shortened. Moreover, the vertical shear force from the concrete of a structure can be transmitted to a steel sheet pile main body only by inserting a steel sheet pile with a nut into the ground.

As described above, in the present invention, the surface facing the structure side of the steel sheet pile main body is welded with the nut before the steel sheet pile main body is completely inserted into the ground, after the insertion of the steel sheet pile main body, A fixing material such as an anchor bar formed with a male screw can be connected by screwing.
As a result, after the steel sheet pile main body is inserted, the welding work for joining the fixing material is eliminated, the problem of workability deterioration when relying on welding is solved, and the problem of reliability reduction is also solved. Further, since the fixing material is connected to the nut only by screwing, the workability and work efficiency are improved compared to the case of welding, and the construction period can be shortened.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  As shown in FIGS. 7 and 8, the present invention constitutes a steel sheet pile in a steel sheet pile inserted into the ground while adjacent to the circumferential direction so as to surround a reinforced concrete structure 5 to be built in the ground. It is the steel sheet pile 1 with a nut by which the nut 3 is welded in the end surface to the surface which faced the said structure 5 side of the steel sheet pile main body 2 to do.

  The steel sheet pile main body 2 is a U-shaped steel sheet pile having a web 2 a and a flange 2 b, and the nut 3 is on the surface of the web 2 a of the steel sheet pile main body 2 on the structure 5 side so as to follow the material axis direction of the steel sheet pile main body 2. Welded. “Along the material axis direction” means that the nuts 3 are arranged at intervals in the material axis direction and do not necessarily have to be arranged on the same line. 1 and 2 show the case where the nuts 3 are welded by being arranged in a line along the central portion in the width direction of the steel sheet pile main body 2 or in the vicinity thereof, and FIG. 3 is the case where the nuts 3 are welded in parallel in the width direction. In addition, the nuts 3 are welded in a staggered manner.

  The surface facing the structure 5 side of the steel sheet pile main body 2 refers to either the convex surface side or the concave surface side of the web 2a, or both, and when the nut 3 is welded to the entire steel sheet pile main body 2. The steel sheet pile 1 with a nut shown in FIG. 1 in which the nut 3 is welded to the convex surface side of the web 2a and the steel sheet pile 1 with a nut shown in FIG. 2 in which the nut 3 is welded to the concave surface side are prepared. When welding the nut 3 to the steel sheet pile main body 2 such as every other one, either the steel sheet pile 1 with a nut shown in FIG. 1 or the steel sheet pile 1 with a nut shown in FIG. 2 is prepared.

  When the nut 3 is welded to the central portion in the width direction of the web 2a or in the vicinity thereof, the position and length of the nut 3 are adjusted so that the nut 3 fits in the inlets 71a and 72a of the chuck 7 of the press-fitting machine 6, for example. Thus, it is possible to perform the insertion with the press-fitting machine 6 while welding the nut 3 before the steel sheet pile main body 2 is inserted into the ground. Even when arranged in the width direction or arranged in a staggered manner, the stroke length of the chuck 7 is taken into consideration, and the steel sheet pile body 2 is intermittently welded in the direction of the material axis so as to remove the gripping position. For example, there is no interference with the chuck 7 and insertion by the press-fitting machine 6 is possible.

  If the nut 3 is welded through the web 2a of the steel sheet pile main body 2, the nut 3 can be accommodated in both the inlets 71a and 72a of the chuck 7 while giving the nut 3 a sufficient length. In this case, if a cap nut is used for the nut 3, it is possible to avoid water leakage from the groundwater web 2a existing in the ground around the structure 5 due to the nut 3 penetrating the web 2a.

  The steel sheet pile main body 2 is inserted into the ground while welding the nut 3 in the process of inserting the steel sheet pile main body 2 into the ground, in addition to being inserted as a steel sheet pile 1 with a nut to which the nut 3 is welded in advance. After the steel sheet pile 1 with a nut is inserted into the ground, a fixing material 4 such as an anchor bar having a male screw formed from one side is connected to the nut 3 by screwing.

  According to the method of welding the nut 3 to the steel sheet pile main body 2 in the process of inserting the steel sheet pile main body 2 into the ground, the chuck of the press-fitting machine 6 and the vibrator hammer 8 is removed from the steel sheet pile main body 2 during the insertion of the steel sheet pile main body 2. The nut 3 is welded on the ground to the portion of the steel sheet pile main body 2 located below the chuck while it once comes off and rises by one stroke. In this case, since the nut 3 does not interfere with the chuck, the welding position of the nut 3 with respect to the web 2a is not limited to the central portion in the width direction or the vicinity thereof. It can be welded at an arbitrary position such as parallel to the direction.

  The steel sheet pile 1 with a nut or the steel sheet pile main body 2 before welding the nut 3 is inserted into the ground using a press-fitting machine 6 as shown in FIG. 9 or using a vibrator hammer 8 as shown in FIG. Done.

  The steel sheet pile 1 with a nut or the steel sheet pile main body 2 is press-fitted into the steel sheet pile main body 2 while changing the direction of the web 2a by reversing the chuck of the press-fitting machine 6 or the like, and all the nuts 3 are arranged facing the structure 5 side. To do.

  After inserting the steel sheet pile 1 with the nut into the ground, or while inserting the steel sheet pile main body 2 before the nut 3 is welded into the ground, the nut 3 is welded to the steel sheet pile main body 2, and the steel sheet pile 1 with the nut Then, the ground inside the area surrounded by the steel sheet pile 1 with nut is excavated to the level of the bottom surface of the structure 5 and the earth and sand are discharged. Thereafter, as shown in FIGS. 1, 2, and 4, a fixing material 4 such as an anchor bar having a male screw formed from one side is connected to the nut 3. The fixing material 4 only needs to have a male screw portion, and the form is not limited.

  After the fixing material 4 is connected, the structure 5 is constructed by reinforcing bars and placing concrete as shown in FIG. The steel sheet pile 1 with a nut has a length that can secure a sufficient depth of penetration below the bottom surface of the structure 5. FIG. 7 shows a state where the pier is constructed on the footing which is the structure 5.

  A perforated steel sheet 9 for transmitting a shearing force between the structure 5 and the steel sheet pile 1 with a nut is welded to the inner peripheral surface of the web 2a of the steel sheet pile 1 with a nut inserted into the ground if necessary. In that case, the fixing material 4 is also connected to the perforated steel sheet 9. The fixing material 4 is connected, for example, by inserting a hook formed on the perforated steel plate 9 side into the hole.

  FIG. 11 shows the production of a steel sheet pile 1 with a nut in which a perforated steel sheet 9 welded with a nut 3 is welded to the surface of the steel sheet pile body 2 facing the structure 5 side along the material axis direction of the steel sheet pile body 2. For example, FIG. 12 shows the arrangement of the steel sheet piles 1 with nuts. The nut 3 is welded to both end surfaces of the perforated steel sheet 9 in the length direction in parallel to the surface of the perforated steel sheet 9. In FIG. 11, a plurality of perforated steel plates 9 are intermittently welded in the axial direction of one steel sheet pile main body 2, but one continuous perforated steel plate 9 may be welded.

  In addition to plates, angled steel, grooved steel, and the like are used for the perforated steel sheet 9 and are spaced in the longitudinal direction on a plate element (web of the perforated steel sheet 9) that forms a plane perpendicular to the web 2a of the steel sheet pile main body 2. A hole 9a for transmitting a shearing force from the concrete to the steel sheet pile 1 with a nut is formed by allowing the concrete of the structure 5 to enter. In some cases, the fixing material 4 such as an anchor bar is engaged and connected to the hole 9a. The fixing material 4 is connected, for example, by inserting a hook formed on the perforated steel plate 9 side into the hole 9a.

  A steel sheet pile 1 with a nut shown in FIG. 11 is inserted into the ground using a vibro hammer 8 because the perforated steel sheet 9 does not fit in the chuck 7 of the press-fitting machine 6. On the contrary, the length of the nut 3 is not limited by the chuck 7 of the press-fitting machine 6, and the length corresponding to the width of the perforated steel plate 9 can be given to the length of the nut 3. The length can be increased, and it is possible to make the nut 3 bear a larger tensile force than when the restriction of the chuck 7 is received.

It is the perspective view which showed the relationship between the steel sheet pile with a nut which welded the nut to the convex surface side of the steel sheet pile main body, and the fixing material. It is the perspective view which showed the relationship between the steel sheet pile with a nut which welded the nut to the concave surface side of the steel sheet pile main body, and the fixing material. It is the perspective view which showed the steel sheet pile with a nut welded in parallel with the nut on the convex surface side of the steel sheet pile main body. It is the top view which showed the arrangement | sequence state of the steel sheet pile with a nut. (A) is the top view which showed the press injection machine when the chuck | zipper is open, (b) is the partially expanded view of (a). (A) is a plan view showing a press-fitting machine when the chuck is closed, and (b) is a partially enlarged view of (a). It is the elevation which showed a mode that the structure was constructed | assembled after insertion of the steel sheet pile with a nut. FIG. 8 is a plan view of FIG. 7. It is the elevation which showed the mode of insertion of the steel sheet pile with a nut using a press-fitting machine. It is the elevation which showed the mode of insertion of the steel sheet pile with a nut using a vibro hammer. It is the perspective view which showed the relationship between the steel sheet pile with a nut and the fixing material which welded the perforated steel plate to which the nut was welded to the convex surface side of the steel sheet pile main body. It is the top view which showed the arrangement | sequence state of the steel sheet pile with a nut shown in FIG.

Explanation of symbols

1 ... Steel sheet pile 2 with nut ... Steel sheet pile body 2a ... Web 2b ... Flange 3 ... Nuts 4 ... Fixing material 5 ... Structure 6 ... Press-fitting machine 7 ... Chuck 71 ...... Moving part 71a ... Injection port 72 ... Receiving part 72a ... Injection port 8 ... Vibro hammer 9 ...... Perforated steel plate 9a ... Hole

Claims (6)

  In a steel sheet pile inserted into the ground while adjacent to the circumferential direction so as to surround a reinforced concrete structure to be built in the ground, it faces the structure side of the steel sheet pile main body constituting the steel sheet pile. A steel sheet pile with a nut, characterized in that a nut is welded to the surface at its end face.   The steel sheet pile with a nut according to claim 1, wherein the nut is welded to a central portion in the width direction of the steel sheet pile main body or the vicinity thereof.   In a steel sheet pile inserted into the ground while adjacent to the circumferential direction so as to surround a reinforced concrete structure to be built in the ground, it faces the structure side of the steel sheet pile main body constituting the steel sheet pile. A steel sheet pile with a nut, characterized in that a perforated steel plate welded with a nut is welded to the surface.   The steel sheet pile with a nut according to claim 1 or 2 is inserted into the ground while adjoining the circumferential direction so as to surround a reinforced concrete structure to be built in the ground, and the steel with a nut A method for constructing a steel sheet pile with a nut, wherein after the earth and sand inside a region surrounded by a sheet pile is discharged, a fixing material in which a male screw is formed from one side is connected to the nut of the steel sheet pile with a nut.   Nuts on the surface of the steel sheet pile body facing the structure side while inserting the steel sheet pile body into the ground while adjoining the circumferential direction so as to surround the reinforced concrete structure to be built in the ground The steel sheet pile with a nut according to claim 1 or 2 is manufactured by welding at an end face thereof, and the earth and sand inside a region surrounded by the steel sheet pile with a nut is discharged, and then the steel sheet pile with a nut is discharged. A fixing method in which a male screw is formed from one side is connected to the nut. The steel sheet pile with a nut according to claim 3 was inserted into the ground while being adjacent in the circumferential direction so as to surround a reinforced concrete structure to be built in the ground, and surrounded by the steel sheet pile with a nut. A method for constructing a steel sheet pile with a nut, wherein after the earth and sand inside the region is discharged, a fixing material in which a male screw is formed from one side is connected to the nut of the steel sheet pile with a nut.

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