JP2001032696A - Water cut-off method for construction joint of underground concrete structure and water cut-off structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut off water, corresponding to a joint opening amount of a joint, by forming a groove on a tip face of a following concrete wall side on a preceding concrete wall, arranging a water expansion seal material in the groove and giving a placing joint to the following concrete wall. SOLUTION: The underground water entering a construction joint H from the natural ground due to opening of the construction joint H is led into a water cut-off space 22, and a water expansion seal material 15 is expanded due to the reaction with the underground water to block the water cut-off space 22. Further, since the construction joint H is blocked and expansion magnification of the water expansion seal material 15 is selected properly, water can be cut off even when a joint opening amount of the construction joint H is large. In this case, it is unnecessary to predict a joint opening amount of the construction joint H in advance and it is possible to correspond flexibly in accordance with the construction joint opening amount. Since the water expansion seal material 15 is expanded toward a water cut-off projecting part 23 side only in a groove 21, it is possible to concentrate expansion pressure of the seal material 15 on the water cut-off projecting part 23 side. Consequently, it is possible to position and fix the water expansion seal material 15 easily at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stopping method and a water stopping structure for an underground concrete structure in which an underground concrete structure is constructed by connecting one concrete wall to another concrete wall. .

[0002]

2. Description of the Related Art Underground concrete structures include, for example, concrete tunnel inner walls. As a method of constructing a tunnel having this kind of concrete inner wall of a tunnel, a tunnel is excavated by an excavator advancing while excavating the ground, an inner formwork is arranged on the inner surface of the excavated tunnel, And place the wife form between the ground and the ground, fill concrete into the concrete casting space formed between the inner form and the ground from the concrete supply pipe provided in the wife form, A tunnel construction method for constructing a concrete tunnel inner wall is known.

In this tunnel construction method, a shield excavator 1 and a concrete placing device 2 are used as shown in a side sectional view of FIG. Concrete casting device 2
Is a skin plate 3 arranged behind the shield excavator 1 so as to support the ground E along the inner surface of the tunnel T excavated by the shield excavator 1, and also arranged behind the shield excavator 1. An inner form 4 covering the inner surface of the tunnel T excavated by the shield excavator 1 at a position separated from the inner surface of the tunnel T by a predetermined distance; and a skin plate disposed between the skin plate 3 and the inner form 4. 3 and inner formwork 4
Formwork 5 that forms a concrete casting space S between
A wand form jack 6 which is provided behind the shield excavator 1 and presses and fixes the wand form 5 rearward along the axial direction of the tunnel T; and one end is connected to the concrete supply source D. And a concrete supply pipe 7 whose other end communicates with the concrete placing space S through the wife formwork 5.

In the above-described configuration, the inner form 4 is a unit that is connected in plural numbers along the circumferential direction of the tunnel T, and is provided on the shield excavator 1 side in accordance with the extension of the tunnel T by the shield excavator 1. They are sequentially added in a ring shape to the ends. The wife formwork 5 has a ring shape continuous in the circumferential direction of the tunnel T. In addition, wife formwork jack 6
And the concrete supply pipe 7 are not shown,
Are provided in the circumferential direction, and are connected to each of the wife forms 5. In addition, as the shield excavator 1, for example, a plurality of cutters 8 are provided on an end face facing the excavation direction, and the cutter 8 is driven to rotate around a center so as to excavate the ground E by the cutter 8. A generally cylindrical excavator body 1b, which is provided with a rotating body 1a, a driving device (not shown) arranged behind the rotating body 1a and rotationally driven about the rotating body 1a, and excavation; It is arranged between the rear part of the machine main body 1b and the inner mold 4 and presses and fixes the inner mold 4 rearward by stretching against the inner mold 4,
A shield jack 1c that uses the reaction force as the driving force of the shield excavator 1 is used.

In the tunnel construction method described above, the excavation of the tunnel T by the shield excavator 1 is stopped at regular intervals and the casting of concrete forming the inner wall of the tunnel T is temporarily stopped for convenience of construction. Let me. In addition, there is a case where the placing of concrete is interrupted during construction due to excavation trouble or the like.
When resuming the casting of the concrete forming the inner wall of the tunnel T, the succeeding concrete wall is to be newly connected to the previously cast concrete wall, and the previously cast concrete wall is to be cast. A seam occurs at the joint between the concrete wall and the subsequent concrete wall. Here, the opening amount of the joint (the size of the gap formed at the joint) is expanded to a predetermined size after the concrete is cast, for example, due to drying and shrinkage of the cast concrete.

FIG. 11 shows an example of a method of stopping water at the joint of the inner wall of a tunnel (underground concrete structure).
As shown in (a), one concrete wall W1 of a joint end face (tip face) of one concrete wall W1 (concrete wall to be preceded) and another concrete wall W2 (consecutive concrete wall). A method of embedding a waterproof plate a so as to straddle the joint H between the joint end face on the side and the joint end face of one concrete wall W1 and the other concrete end as shown in FIG. Wall W
2 and a method of embedding or affixing the sealing material b so as to come into contact with the second concrete wall 2, as shown in FIG. A method of providing a waterproof film c made of a waterproof sheet or the like between the concrete walls W1 and W2 on the side in contact with the mountain, and as shown in FIG.
One concrete wall W1 and the other concrete wall W2
A method of filling the joint H with a caulking material d is known.

Here, the water stopping method of the joint shown in FIG.
The sealing material b is attached to the surface on the side of the placing space S using an adhesive or the like, and one concrete wall W1 is driven in this state, whereby the sealing material b is attached to the joint end surface of the one concrete wall W1. A groove 9 for accommodating is formed, and after the casting of one concrete wall W1 is completed, the sealing material b is bonded to the groove 9 with an adhesive or is buried, thereby separating from the wife form 5 and in this state. And the other concrete wall W2 is cast.

[0008]

However, FIG.
In the conventional method for stopping water at the joint of the tunnel inner wall (underground concrete structure) shown in (a) to (d), only when the opening amount of the joint H is within a small range of about several mm to 5 mm. There was a problem that it could not be handled. In addition, there is a problem that as the water pressure of the groundwater becomes higher, the corresponding opening amount becomes smaller. Further, if a waterproof material having a size corresponding to the opening amount of the joint H is not used, a gap is generated between the concrete wall and the waterproof material, so it is necessary to estimate the opening amount in advance. However, there is a problem that it takes time. And the wife formwork 5, one concrete wall W1, and the other concrete wall W
2 is usually wet with groundwater that springs out of ground E, and the concrete wall W
1. There was a problem that a water-stopping effect could not be sufficiently exhibited due to a gap between W2 and the water-stopping material.

In the case of using the water stopping method of the joint shown in FIG. 11B, it is necessary to adhere the sealing material b to the joint end face of the end form 5 or one concrete wall W1 with an adhesive or the like. However, the spliced end face of the wife formwork 5 and one concrete wall W1 is usually wet with groundwater that springs out of the ground E, and this moisture makes it difficult to adhere the sealing material b with the adhesive. However, there is a problem that a gap between the concrete walls W1, W2 and the sealing material b is formed due to the water, and the water stopping effect cannot be sufficiently exhibited.

[0010] Further, the sealing material b is exposed to the flow of the concrete to be cast both when the concrete wall W1 is cast and when the other concrete wall W2 is cast. There is a problem that the surface of the sealing material b is deteriorated and damaged due to the friction with the water and the water stopping effect is reduced. Also, when the concrete walls W1 and W2 are cast, the sealing material b is pushed by the flow of the concrete and is peeled off from the end form 5 or one of the concrete walls W1 to be displaced from an appropriate position. Sealing material b
However, there is a problem that the water stoppage at the joint H may be uncertain.

The present invention has been made in view of the above circumstances, and can flexibly cope with the opening amount of a joint.
An object of the present invention is to provide a method and a structure for stopping water at a joint of an underground concrete structure capable of stopping water against the water pressure of groundwater. Another object of the present invention is to provide a water stopping method and a water stopping structure at a joint of an underground concrete structure capable of improving the reliability of water stopping.

[0012]

According to a first aspect of the present invention, there is provided a method for stopping water at a joint of an underground concrete structure according to the present invention. A method for stopping water at a joint of an underground concrete structure in which an underground concrete structure is constructed by joining a wall, wherein a groove is formed in a leading end surface of the preceding concrete wall on the subsequent concrete wall side. The method is characterized in that a water-expandable sealing material is arranged in the groove, and then the subsequent concrete wall is connected.

[0013] In the method for stopping water at the joint of an underground concrete structure configured as described above, a water-expandable sealing material is used as a water-stopping material for stopping water at the joint of the underground concrete structure. When groundwater enters at the joint of the structure, the water expansion sealing material reacts with the groundwater and expands, and the joint is closed. In addition, when the water expansion seal material reacts with the groundwater, a pressure at which the water expansion seal material expands, that is, an expansion pressure is generated. In addition, the positioning and fixing of the water-swelling seal material is performed by disposing the water-swellable seal material in a groove formed on the front end surface of the concrete wall to be cast in advance. The water-swelling sealing material is provided after the concrete wall to be cast in advance is hardened.

According to a second aspect of the present invention, there is provided a method for stopping water at a joint of an underground concrete structure according to the first aspect. It is arranged on the inner bottom surface side of the groove so that a water stop space is formed on the front end surface side, and when the subsequent concrete wall is provided, concrete is filled into the water stop space and poured. Features. In the method for stopping water at the joint of an underground concrete structure configured in this manner, a water stopping space is provided at the deep bottom surface side of the groove formed on the concrete wall to be cast in advance, at the tip end side of the groove. A water-swellable sealing material is arranged to be formed. Then, by filling the concrete that composes the subsequent concrete wall into the water stop space,
A water-stop projection that fits into the water-stop space is formed. As a result, the groundwater that has entered the joint from the ground due to the opening of the joint is guided into the water stoppage space, and reacts with this groundwater to expand the water expansion seal material, thereby reducing the waterstop space. It is closed and the joint is closed. In addition, a water-swelling sealing material is disposed on the deep bottom surface side of the groove of the concrete wall to be poured in advance, and in this state, the water-swelling sealing material reacts with the groundwater, so that the water-swelling sealing material is in the groove. Inflates only to the side. And the water expansion seal material is fixed more effectively by disposing the water expansion seal material on the deep bottom surface side of the groove of the concrete wall to be cast in advance.

According to a third aspect of the present invention, there is provided a method for stopping water in a joint of an underground concrete structure, wherein the water-expandable sealing material is removed from the inside of the groove. Is provided so as to protrude on the side where the concrete wall is cast, and when the subsequent concrete wall is cast, concrete is cast so as to include the water-swelling sealing material provided so as to be protruded. . In the method of stopping water for an underground concrete structure configured in this manner, a water expansion seal material is disposed across the joint, and the water expansion seal material reacts with the groundwater and expands, thereby closing the joint. Is done.

According to a fourth aspect of the present invention, there is provided a method for stopping water at a joint of an underground concrete structure, wherein the underground concrete structure is constructed by connecting a succeeding concrete wall to a concrete wall to be cast in advance. The method according to claim 1, wherein a ridge is formed on the leading end face of the concrete wall to be preceded on the side of the subsequent concrete wall, and a water expansion seal material is fitted to the ridge. It is characterized in that it is arranged together and then the subsequent concrete wall is spliced.

In the method for stopping water at the joint of an underground concrete structure constructed as described above, a water expansion sealing material is arranged on a ridge formed on a concrete wall to be cast in advance. And the concrete which comprises the following concrete wall is filled, and the water stopping recessed part which fits a water expansion seal material is formed in the following concrete wall.
As a result, the groundwater that has entered the seam from the ground due to the opening of the seam is guided into the water-stop recess, and the water expansion seal material expands by reacting with the groundwater, so that the water-stop recess is formed. It is closed and the joint is closed. Further, when the water expansion seal material reacts with the groundwater and expands, a pressure at which the water expansion seal material expands, that is, an expansion pressure is generated. And
By arranging the water expansion seal material on the ridge of the concrete wall to be cast in advance, the water expansion seal material is more effectively fixed. The water-swelling sealing material is provided after the concrete wall to be cast in advance is hardened.

According to a fifth aspect of the present invention, there is provided a water blocking structure for a joint of an underground concrete structure provided at a joint between one concrete wall and the other concrete wall. Water structure,
Of the one concrete wall, a groove is formed at the joint end face with the other concrete wall, and a water expansion seal material is disposed on the bottom surface side of the back so that a water blocking space is formed in the groove. A water-stop projection that fits into the water-stop space of the groove is formed at the joint end face of the other concrete wall with the one concrete wall.

In the waterproof structure at the joint of an underground concrete structure constructed as described above, a groove is formed in one of the concrete walls at the joint end face with the other concrete wall, and in this groove, A water-swelling sealing material is arranged on the bottom face side so that a water-stop space is formed on the joint end face side, and a water-stop protrusion formed on the other concrete wall is fitted into this water-stop space. You. As a result, the groundwater that has entered the joint from the ground due to the opening of the joint is guided into the water stoppage space, and reacts with this groundwater to expand the water expansion seal material, thereby reducing the waterstop space. It is closed and the joint is closed. In addition, the water-swelling sealing material is arranged on the inner bottom surface side of the groove, and reacts with the groundwater in this state, so that the water-swelling sealing material expands only in the groove toward the water-stop convex portion. And the pressure which expands to a water expansion seal material, ie, expansion pressure, arises because a water expansion seal material reacts with groundwater. The positioning and fixing of the water-swelling sealing material is performed by disposing the water-swelling sealing material on the bottom surface side of the deep part of the groove of one concrete wall.

According to a sixth aspect of the present invention, there is provided a water-stop structure for a joint of an underground concrete structure provided at a joint between one concrete wall and the other concrete wall. Water structure,
In the one concrete wall, a first groove is formed in a joint end face with the other concrete wall, and in the other concrete wall, a first groove is formed in a joint end face with the one concrete wall. A second groove having substantially the same shape as the first groove is formed so as to face the first groove, and one side is arranged in the first groove and the other side is arranged in the second groove. And a water expansion sealing material is provided.

In the water stopping structure at the joint of the underground concrete structure thus constructed, the first groove formed on the joint end face of one concrete wall and the joint end face of the other concrete wall are formed. In the second groove formed,
The water-swelling sealing material is disposed over the water-swelling sealing material and reacts with the groundwater in this state, whereby the water-swelling sealing material expands and the joint is closed. Further, when the water expansion seal material reacts with the groundwater and expands, a pressure at which the water expansion seal material expands, that is, an expansion pressure is generated. The positioning and fixing of the water-swelling sealing material are performed by disposing the water-swelling sealing material in the grooves of the concrete walls.

According to a seventh aspect of the present invention, there is provided a water stopping structure for a joint of an underground concrete structure provided at a joint between one concrete wall and the other concrete wall. Water structure,
Of the one concrete wall, a ridge is formed on a joint end face with the other concrete wall, and the ridge has
A water-blocking seal is fitted and arranged, and a water-blocking concave portion that fits into the water-blocking seal is formed on an end face of the other concrete wall that is joined to the one concrete wall. And

In the water stopping structure at the joint of an underground concrete structure constructed as described above, a ridge is formed on one concrete wall, and a water expansion seal material is fitted to the ridge and arranged. . Then, a water-stopping concave portion formed on the other concrete wall is fitted to the water-swelling water-stopping material.
As a result, the groundwater that has entered the seam from the ground due to the opening of the seam is guided into the water-stop recess, and the water expansion seal material expands by reacting with the groundwater, so that the water-stop recess is formed. It is closed and the joint is closed. Further, when the water expansion seal material reacts with the groundwater and expands, a pressure at which the water expansion seal material expands, that is, an expansion pressure is generated. And
Since the water-swelling sealing material is provided so as to be fitted to a ridge formed on one concrete wall, positioning and fixing of the water-swelling sealing material are performed.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. Here, as the underground concrete structure, concrete is cast in place by the concrete casting device 2 on the inner surface of the tunnel T excavated by the excavator 1 as shown in FIG. Using a concrete tunnel inner wall constructed by the construction method of constructing the tunnel inner wall, at the joint of this tunnel inner wall,
The case where the method and structure for stopping water at the joint of an underground concrete structure of the present invention will be described.

[First Embodiment] First, a detailed structure and a water-stopping material of a concrete casting device 2 used for carrying out a water-stopping method at a joint of an underground concrete structure according to the present invention will be described. FIGS. 2A and 2B are side sectional views showing how the inner wall of the tunnel T is constructed. Reference numeral E denotes a ground mountain, reference numeral 3 denotes a skin plate for holding the ground mountain E, reference numeral 4 denotes an inner mold, reference numeral 5 denotes a wife mold, and numeral 6 denotes a wife mold jack. Here, FIG. 2B is an enlarged view of the vicinity of the wife formwork 5 in FIG.

The wife form 5 is connected to a concrete supply pipe 7 (FIG. 2).
A concrete delivery path (not shown) for connecting the concrete supplied from the concrete supply pipe 7 into the concrete placement space S by connecting the concrete placement space S to the concrete placement space S is provided. In addition, seals 5a and 5b for preventing leakage of concrete poured into the concrete placing space S are provided at portions of the wife formwork 5 that come into contact with the skin plate 3 and the inner formwork 4, respectively.

Further, on the inner surface of the wife formwork 5, that is, the surface on the side of the concrete placing space S, the front end surface of the concrete wall W1 formed in the concrete placing space S on the subsequent concrete wall W2 side (punching surface). A piston ring accommodating groove 11 formed along a ridgeline where the joint end face intersects the inner surface is provided. In the piston ring accommodating groove 11, a piston ring 12 that is operated to project into the concrete placing space S is provided. Are provided over the entire circumference of the piston ring housing groove 11.

The piston ring accommodating groove 11 is a space for accommodating a part of the water expansion seal material 15 between the tip of the piston ring 12 and the edge of the piston ring accommodating groove 11 when the piston ring 12 is accommodated. The bottom surface thereof has a rod insertion hole 13 extending toward the outside of the end form 5, that is, the side opposite to the concrete placing space S. Are formed.
The piston ring 12 is inserted into a rod insertion hole 13 provided on the bottom surface of the piston ring housing groove 11 and connected to a piston rod 14 that is driven forward and backward along the rod insertion hole 13 by a driving device (not shown). I have.

The water-swellable sealing material 15 for stopping the seam between the concrete wall W1 to be cast in advance and the concrete wall W2 to the next is made of a water-swellable material such as an elastomer containing a water-absorbing resin. And a ring-shaped member having the same diameter as the piston ring housing groove 11. The cross section has a substantially rectangular shape, as shown in the side cross-sectional view of FIG. Here, the horizontal width of the water-swelling sealing material 15 in the dry state is a width enough to be fitted in the piston ring accommodating groove 11 of the end mold 5, and its thickness, that is, the depth of the piston ring accommodating groove 11. The dimension in the direction is formed so as to be smaller than the length of the piston ring 12 protruding from the piston ring accommodating groove 11, that is, the depth of a groove 21 (described later) formed in the concrete wall W1 previously cast. I have. In addition, the water expansion sealing material 15
Groove 2 formed in concrete wall W1 to be cast in advance
In order to prevent the groove 21 from falling off, a flange 15a is formed on a surface of the groove 21 which comes into contact with the inner surface of the groove 21.

Hereinafter, by using the concrete placing device 2 configured as described above, the inner wall of the tunnel to which the method and structure for stopping water of the joint of the underground concrete structure according to the first embodiment of the present invention is applied. The construction work will be described. First, concrete is filled into the concrete placing space S at a predetermined filling pressure from the concrete supply pipe through the concrete delivery path of the wife formwork 5, and the concrete wall W1 to be poured in advance (hereinafter referred to as the concrete wall W1). After that, the supply of concrete to the concrete supply pipe is stopped. Before the concrete wall W1 in the concrete casting space S is hardened, the piston ring 12 provided on the wand formwork 5 is advanced to the concrete placement space S side as shown in FIG. From the surface on the side of the concrete placing space S, thereby forming a groove 21 on the front end surface of the concrete wall W1 on the side of the subsequent concrete wall W2.

Here, when the piston ring 12 is moved forward, the piston rod 14 is moved forward along the rod insertion hole 13 by a driving device (not shown), and the piston rod 14 is moved forward.
This is performed by pressing the piston ring 12.

Next, after the curing of the concrete wall W1 is completed, the piston ring 12 provided on the wand form 5 is pulled back and housed in the piston ring accommodating groove 11, and the wrist form jack 6 is shrunk to reduce the wrist form jack 6. The mold 5 is pulled out from between the skin plate 3 and the inner mold 4. Then, the piston ring 12 of the end mold 5 is inserted into the piston ring accommodating groove 11 by a part of the water-swelling sealing material 15 (in this case, the thickness thereof, that is, half of the dimension of the piston ring accommodating groove 11 in the depth direction). 5) is drawn into the piston ring accommodating groove 11 until there is a space for inserting the same, and as shown in the side sectional view of FIG.
Is mounted by inserting and fitting a part thereof. Here, when the joint between the concrete wall W1 and the subsequent concrete wall W2 (described later) is opened, the groove 2
1 and the water stop protrusion 23 (described later) interfere with each other, and a load is generated at the base of the water stop protrusion 23 due to the friction. Therefore, the friction between the groove 21 and the water stop protrusion 23 is reduced, and the crack due to this load is reduced. In order to prevent such damages, a concrete peeling material is applied to the inside of the groove 21 and its surroundings as necessary.

Next, the wife formwork jack 6 is extended so that the wife formwork 5 is inserted between the skin plate 3 and the inner formwork 4 and brought into contact with the tip end surface of the concrete wall W1. By moving the piston ring 12 forward in this state, FIG.
As shown in the side sectional view of (b), the water-expandable sealing material 15 is pushed into the groove 21 formed on the tip end surface of the concrete wall W1 to the deep bottom surface side of the groove 21. Here, since the thickness of the water-swelling sealing material 15 in the dry state is formed to be smaller than the depth of the groove 21 with respect to the front end surface, a water stop space 22 is formed on the front end surface side of the groove 21. You.
In addition, the water-swelling sealing material 15 is formed in a groove 2 by a retaining flange 15a (not shown in FIG. 5) formed on the side surface.
1 is fixed to the inner bottom surface side of the groove 21.

Next, the piston ring 12 is pulled back until its tip end surface is at the same position as the edge of the piston ring receiving groove 11 of the end form 5, and the piston ring 12 is moved between the end surface of the concrete wall W 1 and the end form 5. The wife formwork jack 6 pulls out the wife formwork 5 by a predetermined distance so as to secure a new concrete placing space S therebetween. Then, concrete is supplied into the newly secured concrete placing space S, and the subsequent concrete wall W2 (hereinafter, abbreviated as concrete wall W2) is connected to the front end surface of the concrete wall W1 (see FIG. 6). At this time, the concrete cast in the concrete casting space S is cast so as to be filled also in the water blocking space 22 formed in the groove 21 of the concrete wall W1.

Then, at the joint H between the concrete wall W1 and the concrete wall W2, a water stop structure at the joint of the underground concrete structure shown in the side sectional view of FIG. 1A is constructed. That is, the concrete forming the concrete wall W2 is filled in the water blocking space 22 provided in the concrete wall W1, so that the groove 21 is formed in the concrete wall W2.
Is formed in the water stop space 22 of the water stop space 22.

In the above-described operation for constructing the inner wall of the tunnel, the water-swelling sealing material 15 is provided in the groove 21 after the concrete wall W1 has hardened. In addition, positioning and fixing of the water expansion seal material 15 are performed by disposing the water expansion seal material 15 in the groove 21 formed in the concrete wall W1. Further, by disposing the water expansion sealing material 15 on the inner bottom surface side of the groove 21 of the concrete wall W1,
The water expansion sealing material 15 is fixed more effectively.

In the waterproof structure at the joint of the underground concrete structure thus constructed, a groove 21 is formed in the concrete wall W1, and a water stop space 22 is formed in the groove 21 on the tip end side. A water-swelling sealing material 15 is disposed on the inner bottom surface side so as to be formed.
The water-stop projection 23 formed on the concrete wall W2 is fitted to the second wall. As a result, the groundwater that has entered the joint H from the ground E due to the opening of the joint H is closed by the water stop space 2.
2 and reacts with the groundwater to expand the water-swelling sealing material 15, thereby closing the water-stopping space 22 and breaking the joint H
Is closed. In addition, the water-swelling sealing material 15 is disposed on the inner bottom surface side of the groove 21. In this state, the water-swelling sealing material 15 reacts with the groundwater, and as shown in FIG. And expands only toward the water stop projection 23 side.
Then, when the water-swelling sealing material 15 reacts with the groundwater, a pressure at which the water-swelling sealing material 15 expands, that is, an expansion pressure is generated.

As a result, according to the water stopping method and structure of the joint of the underground concrete structure according to the first embodiment of the present invention, the joint H is opened, and the joint between the ground E and the joint H is formed. Is introduced into the water stop space 22 and reacts with the ground water to expand the water expansion seal 15, thereby closing the water stop space 22 and closing the joint H. If the opening amount is such that the water stop convex portion 23 is fitted to 22, even if the opening amount of the joint H is large, the expansion ratio of the water expansion sealing material 15 is appropriately selected. Water stoppage at the joint H can be performed. And
By appropriately selecting the expansion ratio of the water expansion seal material 15, the opening amount of the joint H does not need to be predicted in advance, and it is possible to flexibly cope with the opening amount. In addition, since the water-swelling sealing material 15 expands only in the groove 21 toward the water stopping protrusion 23 side, the expansion pressure of the water-swelling sealing material 15 can be concentrated on the water stopping protrusion 23 side, and groundwater can be concentrated. The water stop at the joint H can be effectively performed against the water pressure.

Further, since the water-swelling sealing material 15 expands by reacting with the groundwater, even if the concrete wall W1 and the concrete wall W2 are wet, the water-swelling sealing material 15 can be used.
And the concrete walls W1 and W2 can be brought into close contact with each other, and the water stopping effect can be sufficiently exhibited to improve the certainty of the water stopping. The positioning and fixing of the water-swelling sealing material 15 is performed by disposing the water-swelling sealing material 15 in the groove 21 formed in the concrete wall W1. There is no need to use it, and the positioning and fixing of the water-swelling sealing material 15 can be performed easily and at low cost. Further, when the concrete wall W2 is cast, the water-expandable sealing material 15 is pressed toward the inner bottom surface side of the groove 21 by the cast concrete, so that the water-expandable sealing material 15 can be more securely fixed. It is possible to sufficiently exhibit the water stopping effect and improve the certainty of the water stopping.

The water-swelling sealing material 15 is exposed to the flow of concrete only when the concrete wall W2 is cast and only the surface on the tip end side of the groove 21. The deterioration and damage of the sealing material 15 can be reduced, and the water-swelling sealing material 15
The water-swelling sealing material 15 expands only toward the water-stopping convex portion 23, and the deteriorated and damaged surface of the water-swelling sealing material 15 is pressed against the water-stopping convex portion 23 so as to be in close contact therewith. To improve the reliability of water stoppage.

In the above-described first embodiment, the shape of the water-swelling sealing material 15 is such that a retaining flange 15a is formed as shown in FIG. 3, but the present invention is not limited to this. Alternatively, a simple rectangular cross section may be used. In the first embodiment, the water-swelling sealing material 15 is used.
Is inserted into the groove 2 on the bottom side of the groove 21 of the concrete wall W1.
1 is formed so as to form a water-stop space 22, and the water-stop space 22 is filled with concrete.
Although the example in which the water-stop convex portion 23 fitted to 2 is formed is used, the present invention is not limited to this, and the water-swelling sealing material 22 is projected from the groove 21 of the concrete wall W1, and the concrete wall W2 is cast. At this time, concrete is poured in such a manner as to include the protruding water-swelling sealing material 22 so that the water-stopping structure at the joint of the underground concrete structure shown in the side sectional view of FIG. May be configured.

Here, the water stop structure at the joint of the underground concrete structure shown in FIG. 7A is formed along the ridgeline where the front end surface and the inner surface of the concrete wall W1 intersect at the front end surface of the concrete wall W1. A first groove 26 is formed, and a second groove 27 having substantially the same shape as the first groove 26 is formed on the joint end face of the concrete wall W2 so as to face the first groove 26. A water-swelling seal material 28 is provided along the ridge line such that one side is disposed in the first groove 26 and the other side is disposed in the second groove 27.
The other end of 8 is provided in the second groove 27 of the concrete wall W2. According to the water stopping structure at the joint of the underground concrete structure, the water-swelling seal member 28 is disposed over the joint H, and the water-swelling seal member 15 reacts with the underground water and expands, thereby causing the inside of the groove 26 to expand. Because of the blockage (see FIG. 7B), it is possible to flexibly cope with the opening amount of the joint H, and to stop the water against the water pressure of the groundwater.

[Second Embodiment] The water stopping structure at the joint of an underground concrete structure according to the second embodiment of the present invention is the stop at the joint of the underground concrete structure according to the first embodiment. The concrete casting device 2 is used in the same manner as the water method. In the concrete casting device 2, a wand form 31 is used instead of the wand form 5 and a water expansion seal material is used instead of the water expansion seal material 15. 34.

As shown in the enlarged side sectional view of FIG. 8, the wand mold 31 eliminates the piston ring receiving groove 11, the piston ring 12, the rod insertion hole 13 and the piston rod 14 from the wive form 5, and instead, On the surface on the side of the concrete placing space S, there is provided a concave groove 32 formed along a ridgeline where the tip surface and the inner surface of the concrete wall W1 formed in the concrete placing space S intersect. The concave groove 32 is a substantially trapezoidal groove in cross section formed in a shape that is widened toward the concrete placing space S side, and is formed on the tip surface of the concrete wall W1 on the concrete wall W2 side. A projection 33 having a substantially trapezoidal cross section is formed over the entire surface.

The water-swelling sealing member 34 is a ring-shaped member having the same diameter as the concave groove 32 and has a shape in which the width of the opening is widened toward the opening end as shown in an enlarged sectional side view of FIG. Formed in a substantially U shape in cross section. And the inner surface is a ridge 3 formed on the tip end surface of the concrete wall W1.
3 is formed into a shape along the outer surface shape of the ridge 33 so that the inner surface of the groove 32 is fitted into the groove 32 of the end mold 31. The shape conforms to the shape. That is, the outer surface of the water expansion seal member 34 is an inclined surface that rises at an acute angle with respect to the tip end surface of the concrete wall W1. The water-expandable seal member 34 has a non-expandable rubber in which a portion abutting on the base of the ridge 33 and a portion abutting on the tip of the ridge 33 when fitted with the ridge 33 are made of non-expandable rubber. The rubber portion 34a is provided, and a portion located between the non-expandable rubber portions 34a, that is, a portion located between a portion abutting on the base of the ridge 33 and a portion abutting on the tip of the ridge 33 is made of rubber having water-swelling properties. The water-swelling rubber portion 34b is configured. That is, the water-expandable seal member 34 mainly performs expansion toward the side to stop the water at the joint.

Hereinafter, by using the concrete casting device 2 configured as described above, the inner wall of the tunnel to which the method and the structure for stopping water at the joint of the underground concrete structure according to the second embodiment of the present invention are applied. The construction work will be described. First, concrete is filled into the concrete placing space S from the concrete supply pipe through the concrete delivery path of the end form 5 with a predetermined filling pressure, and the concrete wall W1 is cast. Stop supply. Then, the groove 32 is formed in the wife formwork 31.
Is formed, a ridge 33 is formed on the tip end surface of the concrete wall W1 (see FIG. 8).

Next, after the curing of the concrete wall W1 is completed, the wife form jack 6 is contracted to thereby reduce the wife form 31.
Is drawn out from between the skin plate 3 and the inner mold 4. Then, a water expansion seal material 34 is fitted into the concave groove 32 of the wife formwork 31 by fitting the same, and the wife formwork jack 6 is extended in this state, so that the wife formwork 31 and the inner plate It is inserted between the frame 4 and brought into contact with the tip end surface of the concrete wall W1. Thereby, the concave groove 3 of the wife formwork 31 is formed.
The water-swelling sealing material 34 fitted in 2 is fitted into the ridge 33 of the concrete wall W1 and fixed to the ridge 33.
At this time, since the water-swelling sealing material 34 has a substantially U-shape in cross-section formed in a shape in which the width of the opening is widened toward the opening end, the water-swelling sealing material 34 is fitted to the ridge 33 of the concrete wall W1. At this time, the inner surface of the water-swelling sealing material 34 is guided by the outer surface of the ridge 33 and is guided to an appropriate position.

Subsequently, the wife formwork jack 6 pulls out the wife formwork 31 by a predetermined distance so as to secure a new concrete placing space S between the tip end surface of the concrete wall W1 and the wife formwork 31. Secured concrete placement space S
Concrete is supplied into the inside, and the concrete wall W2 is connected to the end face of the concrete wall W1.

As a result, a water stop structure at the joint of the underground concrete structure shown in the enlarged side sectional view of FIG. 9 is constructed at the joint H between the concrete wall W1 and the concrete wall W2. That is, the ridge 33 is formed on the concrete wall W1, the water-swelling sealing material 34 is fitted on the ridge 33, and the water-stopping concave portion 35 fitted with the water-swelling sealing material 34 is formed on the concrete wall W2. You.

In the operation for constructing the inner wall of the tunnel, the water-swelling sealing material 34 is provided on the ridge 33 after the concrete wall W1 has hardened. Further, the water expansion seal material 34 is positioned and fixed by being fitted and disposed on the ridge 33 formed on the concrete wall W1. When the concrete wall W2 is cast, the water-expandable sealing member 34 is formed by the cast concrete.
3, and the outer surface of the water-swelling sealing material 34 is an inclined surface that projects outward from the tip side of the ridge 33 toward the base of the ridge 33, and is formed from concrete to be cast. Since the received pressure acts as a pressure for pressing the ridge 33, the water-expandable seal member 34 is not shifted. In addition, since the outer surface of the water-swelling sealing material 34 is an inclined surface where the width of the opening increases from the tip end of the ridge 33 toward the base, the water-swelling sealing material of the concrete forming the concrete wall W2 is used. Retention around 34 is reduced.

In the water stopping structure at the joint of the underground concrete structure constructed as described above, the groundwater entering the joint H from the ground E by the opening of the joint H is
The water expansion seal 34 is expanded by being guided into the water stopping recess 35 and reacting with the groundwater, the water stopping recess 35 is closed, and the joint H is closed. Here, the outer surface of the water expansion sealing material 34 forms an inclined surface that rises at an acute angle from the front end surface of the concrete wall W1.
The inner side surface of the second water stop recess 35 is parallel to the outer side surface of the water expansion seal member 34. For this reason, a gap is formed between the concrete wall W1 and the concrete wall W2. As shown in FIG. 9, if the gap h1 between the joint end faces of the concrete walls W1 and W2 is 10 mm, for example, Is 45 degrees, the distance between the outer surface of the water-swelling sealing material 34 and the inner surface of the water-stop recess 35 of the concrete wall W2 is about 7 mm. That is, the opening amount h2 to be actually closed may be about 70% of the opening amount h1 between the joint end faces. In addition, since the water-swellable sealing member 34 only needs to be provided with the water-swellable rubber portion 34b mainly on the outer surface, the amount of the water-swellable rubber used is reduced.

Further, by reducing the angle of inclination of the outer surface of the water-swelling sealing material 34 and the inner surface of the water-stop recess 35 of the concrete wall W2 with respect to the opening direction, the opening amount to be actually closed can be increased. It is also possible to make it smaller. However, in order to fit the water-expandable sealing material 34 into the concave groove 32 of the end mold frame 31 at the time of the mounting operation to the ridge 33, the width of the end opposite to the opening end side is set to the width of the concave groove 32. It is necessary to make it smaller than the maximum width between the inner side surfaces (this width is equal to the width of the base of the ridge 33 of the concrete wall W1). For this reason, the outer surface of the water-swelling sealing material 34 needs to have a certain inclination angle so that the width of the end opposite to the opening end is smaller than the width of the base of the ridge 33. There is.

As a result, according to the method and structure for stopping water at the joint of an underground concrete structure according to the second embodiment of the present invention, even if the opening amount is large, the water-swelling sealing material is formed in the water stopping recess 35. If the opening amount is such that the opening 34 is fitted, by appropriately selecting the expansion ratio of the water expansion seal material 34, even when the opening amount of the joint H is large, the stop of the joint H can be stopped. Water can be done more effectively. Further, the opening amount to be actually closed can be reduced as compared with the conventional water stop structure, and the water stop at the joint H can be performed more effectively. By appropriately selecting the expansion ratio of the water-expandable seal member 34, it is not necessary to predict the opening amount of the joint H in advance, and it is possible to flexibly cope with the opening amount.

Further, since the water expansion sealing material 34 expands by reacting with the groundwater, the concrete walls W1, W2
Even if it is wet, the water-swelling sealing material 34 and the concrete walls W1 and W2 can be brought into close contact with each other, and the water-stopping effect can be sufficiently exhibited to improve the reliability of water-stopping. In addition, since the amount of the water-expandable rubber used for the water-expandable sealing material 34 is reduced, the construction cost can be reduced.

Further, the protruding ridge 33 is formed in a substantially trapezoidal shape whose width at the base side is wider than that at the tip side, so that the strength against external force is ensured. For this reason, cracks that cause water leakage from the joint H are less likely to occur in the ridges 33, and the reliability of water stoppage can be improved. Moreover, the water expansion sealing material 3 of the concrete forming the concrete wall W2 is used.
4 is reduced, the water-swelling sealing material 3
In addition, it is possible to improve the quality of the concrete wall W2 by reducing defective filling of the surroundings of the concrete, generation of bubbles and water bubbles, and to reduce water leakage caused by these.

Then, the water-swelling sealing material 34 is positioned and fixed by being fitted and arranged on the ridge 33 of the concrete wall W1. Accordingly, it is not necessary to use an adhesive or the like to fix the water-swelling seal member 34, and the positioning and fixing of the water-swelling seal member 34 can be performed easily and at low cost. In addition, since the water expansion seal member 34 is guided to an appropriate position when fitted to the ridge 33 of the concrete wall W1, it is not necessary to perform strict positioning, and the water expansion seal member 34 can be easily attached. Become. further,
When the concrete wall W2 is cast, the water expansion sealing material 34 is used.
The water expansion seal material 15 can be fixed more reliably and the water stopping effect can be sufficiently exhibited, and the reliability of the water stopping can be improved.

Here, in the second embodiment, the mounting of the water-swelling sealing material 34 on the ridge 33 of the concrete wall W1 is performed by fitting the water-swelling sealing material 3 into the groove 32 provided in the end formwork 31.
4 is fitted, and in this state, by pressing the end form 31 against the concrete wall W1, the water expansion sealing material 34 is pressed against the ridge 33 of the concrete wall W1 and fitted. However, the present invention is not limited to this. In order to more reliably attach the water expansion seal material 34 to the ridge 33, the wife mold 31 is replaced with the wife mold 5 instead of the piston ring accommodating groove 11 in the wife mold 5. Is provided with a concave groove 32,
The piston ring 12, the rod insertion hole 13 and the piston rod 14 are provided on the bottom surface of the concave groove 32.
After the piston ring 12 is fitted into the groove 32, the water expansion sealing material 34 is pushed out from the groove 32 to be surely separated from the end mold frame 31 by projecting the piston ring 12 into the groove 32. No problem.

In the first and second embodiments,
As an underground concrete structure to which the method and structure for stopping water of a joint of an underground concrete structure of the present invention are applied, an example using a concrete tunnel inner wall constructed by casting concrete in place has been described. The present invention is not limited to this, and a concrete tunnel inner wall constructed by connecting and arranging preformed concrete segments along the inner surface of the tunnel may be used as the underground concrete structure. In this case, as a segment, a groove 21 is formed on one end face (splicing end face) along a ridge line where one end face and the inner face intersect, and is adjacent to the other end face (splice end face). By using the one in which the water-stopping convex portion 23 fitted to the groove 21 formed in the segment to be arranged is formed, and connecting the segments in a state where the water expansion seal material 15 is arranged in the groove 21, As shown in FIG. 1, a waterproof structure at the joint of the underground concrete structure is constructed. Similarly, as a segment,
A ridge 33 is formed on one end surface along a ridge line where the one end surface and the inner surface intersect, and a stop fitted on the ridge 33 formed on an adjacently arranged segment is formed on the other end surface. By using the one having the water recess 35 formed therein and connecting these segments in a state where the water expansion sealing material 34 is arranged on the ridge 33, the water stopping structure at the joint of the underground concrete structure as shown in FIG. May be constructed. The underground concrete structure is not limited to the inner wall of the tunnel.

[0059]

According to the method for stopping water at the joint of an underground concrete structure according to the first aspect of the present invention, since a water expansion seal material is used as a waterproof material, when groundwater enters the joint of the underground concrete structure. Then, the water expansion sealing material reacts with the groundwater and expands, and the joint is closed. Thus, by appropriately selecting the expansion ratio of the water-expandable sealing material, the joint can be closed and water can be stopped even when the opening amount of the joint is large. In addition, since the water-swelling sealing material expands by reacting with the groundwater, it is not necessary to predict the opening amount at the joint, and it is possible to flexibly cope with the opening amount. In addition, the water expansion seal material reacts with the groundwater to generate a pressure that expands the water expansion seal material, that is, an expansion pressure. Water can be stopped at the joint. Even when the concrete wall is wet with water or the like that springs from the ground, positioning and fixing can be easily performed because no adhesive is used for fixing the water expansion seal material, and the water expansion seal material can be easily fixed. Reacts with the groundwater and expands by this, so that the water expansion seal material and the concrete walls are brought into close contact with each other to sufficiently exert the water stopping effect, thereby improving the certainty of the water stopping. In addition, the water expansion seal material is provided after the concrete wall to be cast in advance is hardened, and the water expansion seal material is exposed to the flow of concrete only when the subsequent concrete wall is cast. Deterioration and damage of the water-swelling sealing material due to friction can be reduced, and the reliability of water stoppage can be improved. And since the water-swelling seal material is arranged in the groove formed in the concrete wall to be cast in advance, there is no need to use an adhesive or the like for fixing the water-swelling seal material, and the time for applying the adhesive is reduced. And eliminate the cost of adhesive,
The positioning and fixing of the water expansion sealing material can be performed easily and at low cost.

According to the method for stopping water at the joint of an underground concrete structure according to the second aspect, the groundwater that has entered the joint from the ground due to the opening of the joint is guided into the water stop space. By reacting with the groundwater, the water expansion seal expands, the water stop space is closed, and the joint is closed. By appropriately selecting the expansion ratio of the sealing material, it is possible to stop the water at the joint even when the opening amount at the joint is large. In addition, since the water-swelling sealing material expands only in the groove toward the water-blocking convex portion, the expansion pressure of the water-swelling sealing material can be concentrated on the water-blocking convex portion, and the pressure against the water pressure of the groundwater can be reduced. Water can be stopped at the joint. Then, when casting the subsequent concrete wall, the water expansion seal material is pressed against the deep bottom surface side of the groove by the cast concrete, so that the water expansion seal material is more securely fixed, The certainty of stopping water can be improved. In addition, since the water-swelling sealing material is disposed in the groove of the concrete wall to be cast in advance, only the surface on the tip end side of the groove allows the concrete to flow only when the subsequent concrete wall is cast. , The deterioration of the water-swelling sealing material due to friction with concrete is reduced. In addition, the water-swelling sealing material expands only in the groove toward the water-stopping convex portion, and the deteriorated and damaged surface of the water-swelling sealing material is pressed against and adheres to the water-stopping convex portion. The water effect can be sufficiently exhibited, and the certainty of water stoppage can be improved.

According to the third aspect of the present invention, the water expansion sealing material is disposed across the joint, and the water expansion sealing material expands in response to the groundwater. Since the joint is closed, the expansion ratio of the water-expandable sealing material is appropriately selected in accordance with the opening amount of the joint, similarly to the method for stopping water of the joint of the underground concrete structure according to claim 1. It can respond flexibly and can stop water at the joints against the water pressure of groundwater. Further, the water stopping effect of the water expansion sealing material can be sufficiently exhibited, and the certainty of the water stopping can be improved.

According to the method for stopping water at the joint of an underground concrete structure according to the fourth aspect, the groundwater that has entered the joint from the ground due to the opening of the joint is guided to the inside of the water-stopping recess. Then, by reacting with the groundwater, the water expansion seal material expands, the water-stopping concave portion is closed, and the joint is closed. Thus, by appropriately selecting the expansion ratio of the water-expandable sealing material, the joint can be closed and water can be stopped even when the opening amount of the joint is large. In addition, since the water-swelling sealing material expands by reacting with the groundwater, it is not necessary to predict the opening amount at the joint, and it is possible to flexibly cope with the opening amount. Then, an expansion pressure is generated in the water expansion seal material by reacting with the underground water, so that the joint pressure can be stopped against the water pressure of the underground water by the expansion pressure. Also, even when the concrete wall is wet, positioning and fixing can be easily performed because no adhesive is used for fixing the water expansion seal material, and the water expansion seal material reacts with the groundwater, thereby Because of the expansion, the water-swelling sealing material and the concrete wall can be brought into close contact with each other, so that the water-stopping effect can be sufficiently exhibited and the reliability of water-stopping can be improved. And since the water-swelling seal material is exposed to the concrete flow only when the subsequent concrete wall is cast, deterioration and damage of the water-swellable seal material due to friction with concrete are reduced, and the reliability of the water stoppage is reduced. Can be improved. In addition, since the water-swelling sealing material is fitted and arranged on the ridge of the concrete wall to be cast in advance, there is no need to use an adhesive or the like to fix the water-swelling sealing material, and the adhesive is applied. The positioning and fixing of the water-swelling sealing material can be performed easily and at low cost without the labor and cost of the adhesive.

According to the fifth aspect of the present invention, a groove is formed in one concrete wall, and a water-expanding sealing material is disposed in the groove and provided in the groove. A water blocking protrusion formed on the other concrete wall is fitted into the water blocking space. As a result, the groundwater that has entered the joint from the ground due to the opening of the joint is guided into the waterstop space, and reacts with this groundwater to expand the water expansion seal, thereby closing the waterstop space. Since the seam is closed and the water stop convex portion is fitted in the water stop space, the opening amount of the seam of the seam can be reduced by appropriately selecting the expansion ratio of the water expansion seal material. Even when large, it is possible to stop the water at the joint. In addition, since the water-swelling sealing material expands only in the groove toward the water-blocking convex portion, the expansion pressure of the water-swelling sealing material can be concentrated on the water-blocking convex portion, and the pressure against the water pressure of the groundwater can be reduced. Water can be stopped at the joint.
Further, the water stopping effect of the water expansion sealing material can be sufficiently exhibited, and the certainty of the water stopping can be improved.

According to the water stopping structure of the joint of the underground concrete structure according to the sixth aspect, the water expansion sealing material is disposed across the joint, and the water expansion sealing material expands by reacting with the groundwater, Since the joint is closed, the expansion ratio of the water-expandable sealing material is appropriately selected, so that the joint can be flexibly handled according to the opening amount of the joint, and the joint of the joint is stopped against the water pressure of the groundwater. be able to. Further, the water stopping effect of the water expansion sealing material can be sufficiently exhibited, and the certainty of the water stopping can be improved.

According to the water stopping structure of the joint of the underground concrete structure according to the seventh aspect, the ground water that has entered the joint from the ground due to the opening of the joint is guided into the water stopping recess by the opening of the joint. Then, by reacting with the groundwater, the water expansion seal material expands, the water-stopping concave portion is closed, and the joint is closed. Thus, if the water-stopping concave portion is fitted to the water-swelling sealing material, by appropriately selecting the expansion ratio of the water-swelling sealing material, the seam can be formed even when the opening amount of the seam is large. It can be closed to stop water. In addition, since the water-swelling sealing material expands by reacting with the groundwater, it is not necessary to predict the opening amount at the joint, and it is possible to flexibly cope with the opening amount. Then, since the water expansion seal material reacts with the groundwater to generate an expansion pressure, the expansion pressure makes it possible to stop the water at the joint against the water pressure of the groundwater. Also, the water expansion seal reacts with the groundwater,
As a result, the water expansion sealing material and the concrete walls are brought into close contact with each other, so that the water stopping effect is sufficiently exhibited, and the reliability of the water stopping can be improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a water stop structure at a joint of an underground concrete structure according to a first embodiment of the present invention.

FIG. 2 is a side cross-sectional view showing a state of construction of an inner wall of a tunnel to which a method for stopping water at a joint of an underground concrete structure and a structure according to the first embodiment of the present invention are applied.

FIG. 3 is a cross-sectional view illustrating a shape of a water expansion sealing material used in a method and structure for stopping water at a joint of an underground concrete structure according to the first embodiment of the present invention.

FIG. 4 is a side sectional view showing an operation of constructing an inner wall of a tunnel to which a method and a structure for stopping water of a joint of an underground concrete structure according to the first embodiment of the present invention are applied.

FIG. 5 is a side sectional view showing an operation of constructing an inner wall of a tunnel to which a method and a structure for stopping water of a joint of an underground concrete structure according to the first embodiment of the present invention are applied.

FIG. 6 is a side sectional view showing a state of an operation of constructing an inner wall of a tunnel to which a method and a structure for stopping water of a joint of an underground concrete structure according to the first embodiment of the present invention are applied.

FIG. 7 is a front sectional view showing a water stop structure at the joint of the underground concrete structure in another example of the first embodiment of the present invention.

FIG. 8 is an enlarged sectional side view showing a state of an operation of constructing a tunnel inner wall to which a method and a structure for stopping water of a joint of an underground concrete structure according to a second embodiment of the present invention are applied.

FIG. 9 is an enlarged side sectional view showing a water stop structure at a joint of an underground concrete structure according to a second embodiment of the present invention.

FIG. 10 is a side sectional view showing a schematic configuration of a concrete placing device used in the present invention and a conventional tunnel construction method.

FIG. 11 is a side sectional view showing a waterproof structure of a joint of an underground concrete structure by a conventional method of stopping water of a joint of an underground concrete structure.

[Explanation of symbols]

4 Inner Formwork 5 Wife Formwork 15, 28, 34 Water Expansion Sealing Material 21 Groove 22 Waterproof Space 23 Waterproof Protrusion 26 First Groove 27 Second Groove 33 Ridge 35 Waterproof Recess H Joint Seam W1 Concrete wall to be cast and cast W2 Subsequent concrete wall

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshimitsu Aso 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Tetsuya Aoyama 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Maho Watanabe 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Shinichi Nishimura 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation ( 72) Inventor Kazuo Miyazawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Takahide Kameda 1-18-1 Kyobashi 1-chome, Chuo-ku, Tokyo In-house Chemical Company (72) Person Hidetaka Nakayama 1-18-1 Kyobashi, Chuo-ku, Tokyo Inside C-Kasei Co., Ltd. (72) Inventor Naoto Watanabe 1-18-1 Kyobashi 1-chome, Kyobashi, Chuo-ku, Tokyo (72) Inventor Keisuke Jingu 1-18-1 Kyobashi, Chuo-ku, Tokyo SHII Kasei Corporation F-term (reference) 2D047 AB08 2D054 FA06 2D055 DA03 GC09 LA02

Claims (7)

[Claims] 1. A method for stopping water at a joint of an underground concrete structure in which an underground concrete structure is constructed by connecting a succeeding concrete wall to a concrete wall to be poured in advance, and A groove is formed in a front end surface of the concrete wall to be formed on the side of the subsequent concrete wall, a water-expanding sealing material is arranged in the groove, and then the succeeding concrete wall is connected to the underground concrete. Water stopping method at the joint of the structure. 2. The method according to claim 1, further comprising: arranging the water-swelling sealing material on a bottom surface side of a deep portion of the groove so that a water-stop space is formed on the distal end surface side of the groove; 2. The method for stopping water in a joint of an underground concrete structure according to claim 1, wherein the water is filled into the water stopping space and poured. 3. The water-swelling sealing material is provided so as to protrude from the groove to the side where the subsequent concrete wall is to be cast, and when the subsequent concrete wall is cast, the water-provided water is provided. The method for stopping water at the joint of an underground concrete structure according to claim 1, wherein concrete is cast so as to include the expansion seal material. 4. A method for stopping water at a joint of an underground concrete structure in which an underground concrete structure is constructed by connecting a succeeding concrete wall to a concrete wall to be poured in advance, and In the concrete wall to be formed, a ridge is formed on the front end surface on the side of the subsequent concrete wall, and a water expansion seal material is fitted to the ridge and arranged, and thereafter, the subsequent concrete wall is joined. Characteristic water stopping method at the joint of underground concrete structures. 5. A water stop structure at a joint of an underground concrete structure provided at a joint between one concrete wall and the other concrete wall, wherein the other concrete wall of the one concrete wall is provided. A groove is formed in the joint end face with the wall, and a water-expanding sealing material is provided on the inner bottom surface side so as to form a water-blocking space in the groove. A water stopping structure at the joint of an underground concrete structure, wherein a water stopping protrusion fitting into the water stopping space of the groove is formed on an end face of the connection with the concrete wall. 6. A water stopping structure at a joint of an underground concrete structure provided at a joint between one concrete wall and the other concrete wall, wherein the one concrete wall includes the other one of the other concrete walls. A first groove is formed at a joint end face with the concrete wall, and a second groove having substantially the same shape as the first groove is formed at the joint end face with the one concrete wall of the other concrete wall. A groove is formed facing the first groove, and a water-expandable sealing material is disposed such that one side is disposed in the first groove and the other side is disposed in the second groove. A waterproof structure at the joint of an underground concrete structure, characterized in that: 7. A water stopping structure at a joint of an underground concrete structure provided at a joint between one concrete wall and the other concrete wall, wherein the one concrete wall includes the other concrete wall. A ridge is formed on an end face of the joint with the concrete wall, and a water expansion seal material is fitted and arranged on the ridge, and a joint end face with the one concrete wall of the other concrete wall is provided. A water stopping structure at the joint of an underground concrete structure, wherein a water stopping concave portion fitted to the water expansion sealing material is formed.