JP4953654B2 - Water stop structure of tunnel segment - Google Patents

Description

  The present invention relates to a water stop structure of a tunnel segment for forming a tunnel wall by connecting in the circumferential direction and the axial direction of the tunnel, and more specifically, the tunnel axial wall of the segment is connected to a steel pipe or channel steel. It is related to the water stop structure of the segment for tunnels.

  In the tunnel segment that is connected in the circumferential direction and the axial direction of the tunnel to form the tunnel wall, a sealing material is provided between the two to prevent water leakage from the connecting portion of adjacent segments. It is carried out. Such a water leak phenomenon is particularly remarkable in the case of a tunnel constructed in a place where the groundwater pressure is large.

  As a conventional tunnel segment, a pair of axial walls along the tunnel axial direction to face adjacent segments in the tunnel circumferential direction, a pair of circumferential walls substantially fan-shaped along the tunnel circumferential direction, and a tunnel wall In order to configure, the peripheral wall along the tunnel circumferential direction, presents a box shape consisting of a wall of a pair of vertical ribs of the same shape as the circumferential wall, and in the circumferential wall is a portion where the circumferential wall is arranged in the tunnel radial direction On the opposite side, a flange portion protruding in the tunnel axial direction is formed over the entire or almost the entire length of the circumferential wall of the circumferential wall to form a ductile iron segment, and the circumferential wall of the tunnel and the shaft There are two seal grooves provided on each of the directional walls, and a sealing material is attached to the seal grooves to stop water (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2003-307100 (pages 3 and 4, FIG. 1-7)

In the tunnel segment of Patent Document 1, the curvature of the segment is realized by cutting the steel plate into a substantially fan shape and welding it, or by separately producing and installing a substantially fan-shaped cast iron. This method not only increases the production cost, but also has a problem that production takes time.
Further, in addition to the segment body structure, it is necessary to separately install a plurality of segment joints and ring joints that are arranged in the circumferential direction of the tunnel and in the tunnel axis direction and are connected to each other.

  Furthermore, in order to withstand the casting load of concrete during the production of the segments, a number of stiffeners that suppress the out-of-plane deformation of the back plate or skin plate that constitutes the peripheral wall along the tunnel circumferential direction are required. During the construction of the segment, since the segment is pushed in with a jack or the like, the strength of the substantially fan-shaped axial wall (segment side surface) along the circumferential direction of the tunnel becomes a problem. In particular, in the case of a tunnel segment for large depths, the pushing force of a jack or the like increases in proportion to the increase in weight per segment. In order to cope with this pushing force, it is necessary to install a large number of stiffeners, and the weight per segment further increases, resulting in a problem that workability deteriorates.

  The present invention has been made to solve the above-described problems, and in a tunnel segment in which a tunnel axial wall that is a main girder is formed of a steel pipe or a grooved steel, water leakage from a connecting portion is ensured with a simple structure. It is an object of the present invention to provide a water stop structure for a tunnel segment that can be prevented.

A water stop structure for a tunnel segment according to the present invention includes an axial wall composed of a pair of steel pipes formed in a substantially arc shape along the circumferential direction of the tunnel, a back plate joined to the axial wall, A circumferential wall joined to both ends of the axial wall and the back plate, a seal groove for attaching a sealing member is provided on the outer wall surface of the axial wall and the circumferential wall , and an outer edge of the sealing material holding member is provided . The sealing material is attached to the lower surface of the sealing material holding member along the ridge line portion, on the same plane as the axial wall and the outer wall of the circumferential wall or slightly inside thereof .
Said sealing material holding member was comprised with the round bar or square bar which consists of steel materials.
Moreover, said sealing material holding member was comprised with the J-shaped member or wedge-shaped member which consists of a steel plate.
Moreover, said sealing material holding member was formed in the edge part of the backplate.

The water stop structure for a tunnel segment according to the present invention includes an axial wall composed of a pair of steel pipes formed in a substantially arc shape along the circumferential direction of the tunnel, and a back plate joined to the axial wall. A round wall or a square bar made of steel in the longitudinal direction of the upper ridge line part of the outer wall of the axial wall and the circumferential wall. A sealing material holding member is provided, and a sealing material is attached to the lower surface of the sealing material holding member along the ridge line portion.

Each said circumferential wall was comprised with the joint board joined to the edge part of the steel pipe which comprises an axial wall.
Moreover, each said circumferential wall was comprised with the short plate of the external shape substantially equal to the steel pipe which comprises an axial wall, or the constraining board joined to the edge part of a steel pipe, and a short pipe.

The outer edge of the sealing material was positioned slightly outside the outer wall of the axial wall and the circumferential wall.
A water-swellable sealing material was used as the sealing material.
Instead of the steel pipe constituting the axial wall, groove steel was used.

In the present invention, the axial wall of the tunnel of the segment is formed of a steel pipe, and a sealing material holding member such as a round bar is attached to the upper ridge portion of the axial wall and the circumferential wall, and the lower portion is sealed along the ridge portion. Since the material is attached and the gap between the adjacent segments is closed by the sealing material when the segments are connected, water leakage from the connecting portion of the segments can be reliably prevented.

[Embodiment 1]
1 is a perspective view of a tunnel segment having a water stop structure according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG. 4 is a cross-sectional view showing another attachment state of the back plate, and FIG. 5 is a perspective view showing a state in which the segment of FIG. 1 is turned upside down.
The tunnel segment according to the present invention (hereinafter simply referred to as a segment) has a plurality of segments S in a ring shape through a sealing material 8 for water stoppage in the tunnel excavated in the ground as shown in FIG. A tunnel peripheral wall is formed by bonding, and the peripheral wall ring is sequentially bonded in the axial direction of the tunnel via a sealing material 8 for water stop to form a tunnel peripheral wall.

1 to 5, reference numerals 1 a and 1 b denote first and second square steel pipes (hereinafter simply referred to as steel pipes) forming axial walls W ₁ and W ₂ of a tunnel which is a main beam of a segment S. These steel pipes 1a and 1b (hereinafter sometimes simply referred to as 1) are formed by bending into a substantially arc shape with a radius r (see FIG. 8) along the circumferential direction of the tunnel, and the inside is filled with concrete 20 Has been.

  The steel pipes 1a and 1b are arranged at a predetermined interval G, and a back plate or a skin plate 2 (hereinafter referred to as a back plate together) forming a tunnel peripheral wall is welded and integrated on the upper surface thereof. Yes. In addition, as shown in FIG. 4, you may attach the backplate 2 to the upper part of the wall surface which the steel pipes 1a and 1b arrange | positioned by the space | interval G oppose by butt welding (the same also in the following embodiment). ). Further, the region corresponding to the gap G between the steel pipes 1a and 1b on the lower surface of the back plate 2, and hence the concrete placement surface, are provided with a plurality of rows of stoppers 3 such as studs at predetermined intervals in the longitudinal direction. Yes.

  4 is a joint plate that is welded to both ends of the steel pipes 1a and 1b, holds the gap G between the steel pipes 1a and 1b, constrains the concrete 20 filled in the steel pipes 1a and 1b, and forms a circumferential wall. By constraining both ends of the steel pipes 1a and 1b, the steel pipes 1a and 1b and the concrete 20 filled therein are integrated, and the bending strength and bending rigidity of the steel pipes 1a and 1b can be improved.

The steel pipes 1a and 1b, the back plate 2 and the joint plate 4 form a box-like portion 6 having an upper opening. Reference numeral 7 denotes a seal groove provided on the outer wall of the steel pipes 1a and 1b and the outer surface of the joint plate 4 for bonding a seal material such as a water-expandable seal material. In addition, although the figure showed the case where the two seal grooves 7 were provided, one may be sufficient.
Reference numeral 9 denotes a plurality of vertical reinforcing bars arranged in the longitudinal direction of the box-like portion 6 (note that the vertical reinforcing bars 9 are omitted in FIG. 5). Then, concrete 20 is placed in the box-like portion 6 in which the slip stopper 3 is provided and the vertical reinforcing bars 9 are arranged.

  In the above description, the region corresponding to the box-shaped portion 6 of the back plate 2, that is, the case where the slip stopper 3 is provided on the concrete placing surface is shown, but the steel pipes 1 a and 1 b surrounding the box-shaped portion 6 are further provided. Anti-skid may be provided on all or a part of the inner wall surface of the joint plate 4 provided at both ends, and further on the side wall of the short pipe 10 described later, thereby making the box-like part 6 and the concrete 20 stronger. Can be integrated.

Next, an example of a manufacturing procedure for the segment S configured as described above will be described.
First, concrete 20 is filled into the steel pipes 1a and 1b which are bent and formed in a substantially arc shape along the circumferential direction of the tunnel and in which the seal grooves 7 are provided on the outer wall.

  Next, both steel pipes 1a and 1b are arranged at a predetermined interval G, and joint plates 4 having seal grooves 7 provided on the outer surfaces are arranged at both ends of both steel pipes 1a and 1b, and are joined by welding. 20 is restrained in the tube axis direction. Next, the back plate 2 having a plurality of stoppers 3 provided on the lower surface in the longitudinal direction of the concrete placing surface is joined to the upper surface of both the steel pipes 1a and 1b by welding. If a plurality of vertical reinforcing bars 9 are arranged in the longitudinal direction of the box-shaped portion 6 formed in this way and concrete 20 is placed in the box-shaped portion 6, the segment S is completed. Note that horizontal reinforcing bars may be arranged at predetermined intervals in the longitudinal direction of the box-shaped portion 6.

As shown in FIG. 6, the segment configured as described above includes seal grooves provided on the outer walls of the steel pipes 1a and 1b constituting the axial walls W ₁ and W ₂ of the tunnel and the outer surfaces of the joint plates 4 at both ends. The sealing material 8 is bonded to each 7. At this time, it is desirable that the outer edge portion slightly protrudes from the outer surfaces of the steel pipes 1 a and 1 b and the joint plate 4. Then, as shown in FIG. 8, the segments S are sequentially connected in the tunnel circumferential direction to form a tunnel circumferential wall, and then the segments S are connected in the tunnel axial direction to form a tunnel axial wall. A tunnel wall is constructed.

  At this time, when the segment S is connected in the tunnel axis direction, as shown in FIG. 7, the sealing material 8 adhered to the steel pipe 1a of the existing segment S and the seal groove 7 of the steel pipe 1b of the segment S connected thereto is obtained. Adhere closely to stop water leakage. 7 shows the water stop structure when the segment S is connected in the tunnel axis direction, the water stop structure can be stopped similarly to the case shown in FIG. 8 when the segment S is connected in the tunnel circumferential direction. it can.

FIG. 9 is a perspective view showing another example of the water stop structure of the tunnel segment according to the present embodiment.
In this example, instead of the joint plate 6 at both ends of the segment S, the sealing plate 7 is provided on the outer surface, and the constraining plates 5 for constraining the concrete 20 filled inside at both ends of the steel pipes 1a and 1b are welded. At the same time, the short pipe 10 having the same size as the steel pipes 1a and 1b is welded between the restraint plates 5 so that the outer wall surface is flush with the outer surface of the restraint plate 5, and the circumferential wall is formed. The seal groove 7 which comprises and the seal groove 7 of the restraint board 5 is provided in the outer wall is comprised. Note that the restraint plate 5 may be omitted, and the short pipe 10 having the seal groove 7 on the outer wall and corresponding to the entire width of the segment S may be joined to both ends of the steel pipes 1a and 1b. Other configurations, manufacturing means, and construction procedures in this example are the same as those in the segment of FIG.

According to the present embodiment, since the axial walls W ₁ and W ₂ of the tunnel of the segment S are constituted by the steel pipes 1a and 1b, the steel pipes 1a and 1b are aligned along the circumferential direction of the tunnel without causing buckling. Since it can be bent and formed into a circular arc shape, it is easy to manufacture. Further, it is not necessary to provide a stiffener on the back plate 2 constituting the circumferential wall of the tunnel, and it is possible to ensure rigidity capable of withstanding the load when placing the concrete 20.
Furthermore, by joining the joint plate 4 or the constraining plate 5 and the short pipe 10 to both ends of the steel pipes 1a and 1b to form a circumferential wall, between the steel pipes 1a and 1b and the concrete 20 filled therein. , It is not necessary to prevent slippage in the circumferential shearing force.

In addition, by configuring the axial walls W ₁ and W ₂ of the tunnel with steel pipes 1 a and 1 b filled with concrete 20, the bearing strength of the side surface of the segment S is improved and it can withstand a large pushing force of the jack during construction. be able to. Moreover, since the flanges (upper and lower surfaces) of the steel pipes 1a and 1b resist the bending force generated in the segment S after construction, the amount of the vertical reinforcing bars 9 can be reduced.
As a result, the manufacturing cost of the segment S is reduced, and not only the manufacturing time is shortened, but also the workability can be improved.

Further, a seal groove 8 is provided on the outer wall of the steel pipes 1a and 1b constituting the tunnel width direction walls W ₁ and W ₂ of the segment S and on the outer surface of the circumferential wall provided at both ends, and the seal material 8 is attached. Since the connection part of the segment S connected in the circumferential direction and the axial direction is sealed, water does not leak from the connection part and water can be reliably stopped.

[Embodiment 2]
10 is a perspective view of a tunnel segment having a water stop structure according to Embodiment 2 of the present invention, FIG. 11 is a sectional view taken along the line CC of FIG. 10, and FIG. 12 is a perspective view of a circumferential end of FIG. It is. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the present embodiment, arc-shaped shoulder portions 11 (hereinafter referred to as ridge line portions) where the outer walls of the steel pipes 1a and 1b constituting the tunnel axial walls W ₁ and W ₂ of the segment S intersect with the upper flanges, and both end portions In the longitudinal direction of the ridge line portion 11 in which the upper edge portion of the constraining plate 5 provided on the shoulder plate and the shoulder portion of the short pipe 10 joined thereto are similarly formed in an arc shape, a round rod 12a made of steel material which is a sealing material holding member. , 12b or a square bar (hereinafter simply referred to as a round bar 12). In this case, the outer edge portion of the round bar 12 is positioned in the same plane as the steel pipes 1a and 1b, the restraint plate 5 and the outer wall surface of the short pipe 10 or slightly inside.
Thereby, the round bar 12 is attached to the upper ridgeline part 11 of the segment S over the entire circumference.

  And as shown in FIG. 13 on the lower surface of the round pipe 12 provided in the ridgeline part 11 of the steel pipes 1a and 1b and the constraining plates 5 and the short pipes 10 at both ends (FIG. 13 shows the case of the steel pipes 1a and 1b. For example, a water-swellable sealing material 13 is bonded along the ridge line portion 11. At this time, the outer surface of the sealing material 13 is substantially flush with the outer wall surfaces of the steel pipes 1a and 1b and the restraining plate 5 and the short pipe 10, or slightly protrudes therefrom.

  When the segment S provided with the sealing material 13 is connected in the tunnel axial direction as described above, as shown in FIG. 14, the outer wall contacts the steel pipe 1a of the existing segment S and the steel pipe 1b of the segment S connected thereto. A substantially inverted triangular space portion is formed between the contact portion and the round bars 12a, 12b, and the space 13 is filled with the sealing material 13 in close contact. At this time, both the round bars 12a and 12b abut or face each other with a slight gap, so that the sealing material 13 does not protrude from between the round bars 12a and 12b. 14 shows the water stop structure when the segments S are connected in the tunnel axis direction, but also when the segments S are connected in the tunnel circumferential direction, as shown in FIG. A sealing material 13 is filled in an inverted triangular space formed between the contact portion of the plate 5 and the short tube 10 and the round bar 12.

  In this way, the sealing material 13 is filled into the substantially inverted triangular space formed between the existing segment S and the upper part of the segment S connected to the round bar 12 and stopped. Since it is watered, water does not leak from the connecting part into the tunnel. Although the figure shows the case where the restraint plate 5 and the short pipe 10 are attached to both ends of the segment S, the case where the joint plate 4 is attached or only the short pipe 10 is attached as shown in FIG. The round bar 12 can be attached by forming the upper edge in an arc shape.

FIG. 16 is an explanatory diagram showing a main part of another example of the present embodiment.
In this example, instead of the round bar 12, the sealing material holding member is replaced by a substantially horizontal J-shaped member 14 (hereinafter referred to as a J-shaped member) formed by bending a steel plate as shown in FIG. Is used). As shown in FIG. 16 (a), the J-shaped member 14 has its long piece 14a welded to the shoulders of the steel pipes 1a and 1b substantially parallel to the flange (upper surface), and the short piece 14b is ridged as necessary. The vertical piece 14c is attached to the portion 11 by welding and is positioned on the same plane as the outer wall surface of the steel pipes 1a and 1b or slightly inside thereof. Similarly, the J-shaped member 14 is attached to both ends of the segment S.
And the sealing material 13 is attached along the ridgeline part 11 from the lower surface of the short piece 14b.

  Also in this example, when the segment S is coupled in the tunnel axis direction, a substantially inverted triangular space is formed between the abutting portions of the steel pipes 1a and 1b and the J-shaped member 14, as shown in FIG. The space portion is filled with the sealing material 13 to stop water. Even when the segments S are connected in the circumferential direction of the tunnel, the water can be similarly stopped.

  In the above description, the case where the round bar 12 or the J-shaped member is used as the sealing material holding member is shown. However, the present invention is not limited to this. For example, as shown in FIG. A plate member 15 (hereinafter referred to as a wedge-shaped member) provided with an inclined surface 15a in the longitudinal direction of the lower surface of the portion (the side to be joined to the steel pipes 1a and 1b), and the inclined surface 15a may be welded to the ridge line portion 11; Furthermore, a shape steel such as angle steel or C-shape steel (channel) can be used.

FIG. 19 is an explanatory view showing still another example of the present embodiment.
In this example, the length and width of the back plate 2 joined to the upper surfaces of the steel pipes 1a and 1b are formed to be equal to or slightly shorter (narrower) than the length of both the steel pipes 1a and 1b and the width between the outer walls. A sealing material holding member is formed by using the peripheral edge portion, and the sealing material 13 is joined along the steel pipes 1 a and 1 b and the ridge line portion 11 of the circumferential wall on the lower surface side of the peripheral edge portion of the back plate 2.

  Also in this example, when the segment S is connected in the tunnel width direction, a substantially inverted triangular space is formed between the abutting portions of the steel pipes 1a and 1b and the back plate 2, as shown in FIG. The space is filled with the sealing material 13 to stop water. Even when the segments S are connected in the tunnel circumferential direction, the water can be stopped in the same manner.

In the present embodiment, substantially the same effect as that of the first embodiment can be obtained, but the steel pipes 1a and 1b constituting the tunnel axial walls W ₁ and W ₂ of the segment S are provided at both ends. A sealing material holding member (round bar 12, J-shaped member 14 or the like) is attached to the joint plate 4 or the restraint plate 5 and the short pipe 10 or the ridge line portion 11 of the short pipe 10 or the peripheral edge of the back plate 2 Since the sealing material 13 is bonded along the ridge line portion 11 to the lower portion of the sealing material holding member using the portion, the sealing material 13 having the same cross-sectional shape can be attached over the entire circumference of the segment S. .

  Further, when the segment S is connected in the tunnel circumferential direction and the axial direction, a substantially inverted triangular space is formed between the outer wall of the adjacent segment S and the seal material holding member, and the seal material 13 is formed in this space. Therefore, it is possible to obtain a water stop structure that can reliably prevent water leakage from the connecting portion with a simple structure. In addition, when a water expansible sealing material is used for the sealing material 13, since the part with a large expansion | swelling amount exists in an outer peripheral side, the water stop effect can be improved more.

  Furthermore, since it is not necessary to provide seal grooves on the outer walls of the steel pipes 1a and 1b constituting the segment S and the circumferential walls at both ends, not only these strengths do not decrease, but also the ridgelines that are the shoulders of these By welding and joining a sealing material holding member made of steel to the portion 11, the structural strength of these members can be increased.

[Embodiment 3]
FIG. 21 is a cross-sectional view (corresponding to the CC cross section of FIG. 10) showing the main part of the water stop structure of the tunnel segment according to Embodiment 3 of the present invention. The same parts as those of the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.
This embodiment, steel pipe 1a constituting the tunnel axis wall W _1, W ₂ of the segment of the second embodiment, in place of 1b, lightweight interposition steel or grooved tunnel axial wall W _1, W ₂ It is made of steel 16a, 16b (hereinafter simply referred to as channel steel). Note that the joint plate 4 or the restraint plate 5 and the short tube 10 or the short tube 10 are provided at both ends of the segment S in the same manner as in the first and second embodiments to form a circumferential wall.

The segment S in FIG. 21 has groove steels 16a and 16b facing each other with the opening facing inward, and a back plate 2 having a detent 3 on the lower surface is welded to the upper surface thereof, and the groove steel is attached to both ends. The short plate 10 or the short tube 10 is joined to the joint plate 4 or the constraining plate 5 that closes the openings at both ends of the 16a and 16b. Further, a seal material holding member (in the figure, a round bar 12) is formed on the ridge line portion 11 where the webs of the grooved steels 16a and 16b intersect with the upper flange, and the ridge line portion 11 provided on the upper edge of the circumferential wall at both ends. And the sealing material 13 is bonded along the ridge line portion 11 under the sealing material holding member. As in the case of FIG. 19, the peripheral portion of the back plate 2 may also serve as a seal holding member.
And the reinforcing bar 9 is arranged in the box-shaped part 6 enclosed by these channel steel 16a, 16b, the backplate 2, and the circumferential wall, and concrete 20 is laid.

FIG. 22 shows channel steels 16a and 16b arranged facing each other with the opening facing downward, and the other configurations are the same as those in FIG.
The construction method of the segment according to the present embodiment is the same as that of the second embodiment, and the formation, operation, and effect of the water stop structure by connecting the segments are the same as those of the second embodiment.

In the above description, the sealing material holding member is provided on the ridge line portion 11 of the grooved steel 16a, 16b constituting the tunnel axial walls W ₁ , W ₂ of the segment S and the ridge line portion 11 of the circumferential wall, and below However, instead of these, the outer surface of the web or flange of the channel steels 16a and 16b and the outer surface of the circumferential wall at both ends are replaced with the case of the first embodiment. Similarly, a seal groove 7 may be provided, and the seal material 8 may be bonded to the seal groove 7.

In each of the above embodiments, the sealing material 8 is bonded to the sealing groove 7 provided on the outer periphery of the segment S, or the sealing material holding member (the peripheral edge portion of the back plate 2 is attached to the upper ridge line portion 11 on the outer periphery of the segment S. And a sealing structure 13 is formed by filling a substantially inverted triangular space formed between the existing segment S and the segment S connected thereto and the sealing material holding member with the sealing material 13. Although the case has been shown, a caulking material may be filled in the facing seal groove 7 or the space.
Moreover, although the case where the joint direction board 4 or the restraint board 5, and the short pipe 10 or the steel pipe 10 was joined to the both ends of the segment S and the circumferential direction wall was comprised was shown, it replaced with these and both steel pipe 1a, 1b or A circumferential wall may be formed by joining groove steels 16a and 16b having the same structure as those of the groove steels 16a and 16b and having both ends closed.

Furthermore, although the case where the water stop structure which concerns on this invention was implemented to the segment S shown in figure was shown, it is not limited to this, For example, slip prevention 3 and the reinforcing bar 9 are abbreviate | omitted, and both steel pipe 1a, 1b or both A short tube or a grooved steel may be joined at a predetermined interval in the longitudinal direction between the grooved steels 16a and 16b, or a slip stopper 3 is provided on the back plate 2 between the short tubes or the grooved steel. The present invention can be applied to segments having other structures as long as concrete pipes 20 are formed using steel pipes or channel steel for the tunnel axial walls W ₁ and W ₂ .

It is a perspective view of the segment for tunnels provided with the water stop structure concerning Embodiment 1 of the present invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is sectional drawing which shows the other attachment state of a backplate. It is a perspective view which shows the state which turned over the segment of FIG. It is an enlarged view of the principal part of FIG. It is action explanatory drawing of the water stop structure of FIG. It is explanatory drawing which shows the state which connected the segment of FIG. 1 in the tunnel circumferential direction. FIG. 10 is a perspective view of another example of the segment according to the first embodiment. It is the perspective view which showed a part of segment for tunnel provided with the water stop structure which concerns on Embodiment 2 of this invention in the cross section. It is CC sectional drawing of FIG. It is a perspective view of the circumferential direction edge part of the segment of FIG. It is an enlarged view of the principal part of FIG. It is action | operation explanatory drawing of the water stop structure of FIG. It is a perspective view which shows the state which connected the segment of FIG. 10 to the tunnel circumferential direction. It is explanatory drawing of the principal part which shows the other example of the water stop structure of Embodiment 2. FIG. It is effect | action explanatory drawing of the water stop structure of FIG. FIG. 10 is an explanatory diagram of a main part of still another example of the second embodiment. FIG. 10 is a cross-sectional view of a main part of still another example of the second embodiment. It is operation | movement explanatory drawing of the water stop structure of FIG. It is sectional drawing of the segment for tunnels provided with the water stop structure which concerns on Embodiment 3 of this invention. FIG. 10 is a cross-sectional view of another example of the third embodiment.

Explanation of symbols

S segment, W ₁ , W ₂ tunnel axial wall, 1a, 1b steel pipe, 2 back plate, 3 slip stopper, 4 joint plate (tunnel circumferential wall), 5 constraining plate, 6 box part, 7 seal groove, 8 , 13 Seal member, 10 Short pipe, 11 Ridge line part, 12 Round bar (sealing material holding member), 14 J-shaped member, 16 Channel steel, 20 Concrete.

Claims (10)

An axial wall composed of a pair of steel pipes formed in a substantially arc shape along the circumferential direction of the tunnel, a back plate joined to the axial wall, and joined to both ends of the axial wall and the back plate A circumferential wall,
A sealing material holding member is provided in the longitudinal direction of the upper ridge line portion of the outer wall of the axial wall and the circumferential wall, and the outer edge of the sealing material holding member is flush with or slightly more than the outer wall of the axial wall and the circumferential wall. A water stop structure for a tunnel segment, wherein the sealing material is attached to the lower surface of the sealing material holding member along the ridge line portion. The water stop structure for a tunnel segment according to claim 1, wherein the sealing material holding member is a round bar or a square bar made of steel. 2. The water stop structure for a tunnel segment according to claim 1, wherein the sealing material holding member is a J-shaped member or a wedge-shaped member made of a steel plate. The water stop structure for a tunnel segment according to claim 1, wherein the sealing material holding member is formed by an edge portion of a back plate. An axial wall composed of a pair of steel pipes formed in a substantially arc shape along the circumferential direction of the tunnel, a back plate joined to the axial wall, and joined to both ends of the axial wall and the back plate A circumferential wall,
A sealing material holding member of a round bar or a square bar made of steel is provided in the longitudinal direction of the upper ridge line portion of the outer wall of the axial wall and the circumferential wall, and the sealing material is provided along the ridge line portion on the lower surface of the sealing material holding member Water stop structure for tunnel segment, characterized by mounting The water stop structure for a tunnel segment according to any one of claims 1 to 5, wherein the circumferential wall is constituted by a joint plate joined to an end of a steel pipe constituting the axial wall. . The said circumferential direction wall was comprised with the short plate of the external shape substantially equal to the steel pipe which comprises an axial direction wall, or the constraining plate joined to the edge part of a steel pipe, and a short pipe, The any one of Claims 1-5 characterized by the above-mentioned. A water stop structure for a tunnel segment according to claim 1 .   The water stop structure for a tunnel segment according to any one of claims 1 to 7, wherein an outer edge of the sealing material is positioned slightly outside the outer walls of the axial wall and the circumferential wall.   The water stop structure for a tunnel segment according to any one of claims 1 to 8, wherein the seal material is a water-expandable seal material.   10. The water stop structure for a tunnel segment according to any one of claims 1 to 9, wherein a grooved steel is used in place of the steel pipe constituting the axial wall.

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