JP2008045333A - Water stop material and water cut-off structure of elastic joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water stop material which maintains a water stop property for a long period of time. <P>SOLUTION: The water stop material 10 is placed between the end side of a waterproof sheet 50 disposed on the outer periphery of a concrete underground structure 20 and the concrete underground structure 20 to prevent water infiltration from the end side of the waterproof sheet 50. The water stop material 10 has an adhesive elastic member 14 which is placed between the end side of the waterproof sheet 50 and the concrete underground structure 20 and extends in the direction of extension of the end of the waterproof sheet 50, and a harder elastic member 12 which is placed between the end side of the waterproof sheet 50 and the concrete underground structure 20 to be at least closer to the opposite side to the end of the waterproof sheet 50 than the adhesive elastic member 14, extends in the direction of extension of the end of the waterproof sheet 50, and has a hardness higher than that of the adhesive elastic member 14. This allows the water stop material 10 to maintain the water stop property for a long period. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a water stop material for securing water stoppage between a waterproof member disposed on the outer periphery of a waterproof body and the waterproof body. Moreover, it is related with the water stop structure of the elastic joint which ensures the water stop between the elastic joint which connects a concrete structure, and the waterproof member arrange | positioned on the outer periphery using this water stop material.

  In order to obtain spaces such as underground roads and underground waterways, a technique for constructing a cylindrical concrete structure in the ground is known. As a method for constructing this type of concrete structure, a groove dug down to a predetermined depth from the ground surface is formed, and after the concrete structure is built at a predetermined position of this groove, earth and sand are buried from the top of the concrete structure. The excavation method that returns and restores the ground surface is widely used.

  In addition, the concrete structure constructed underground has a waterproof construction method in which a waterproof layer is disposed on at least one of the outer wall, the inner wall, and the wall surface of the concrete structure in order to prevent underground water from entering the interior. Has been. As one of the waterproofing methods, there is a method of covering the outer periphery of a concrete structure with a flexible waterproof sheet. Since this method is superior to other methods in terms of waterproofness, workability and cost, it is recommended as a waterproofing method for concrete structures.

As described above, in the case of a waterproof construction method in which the outer periphery of a concrete structure is covered with a waterproof sheet, the waterproof sheets to be coated are bonded to each other via a butyl rubber tape excellent in adhesiveness and rebound resilience, and the waterproof sheet and other members (Here, the concrete structure) is similarly bonded via a butyl rubber tape, so that the outer periphery of the concrete structure is covered with a waterproof sheet. Patent Document 1 and Patent Document 2 describe a bonding method of bonding waterproof sheets and waterproof sheets and other members using this butyl rubber tape.
Japanese Unexamined Patent Publication No. 7-189597 JP 2000-17236 A

  By the way, in recent years, a construction method has been developed in which a flexible joint is disposed along the joint of a cylindrical concrete structure. This flexible joint (elastic joint) has a feature that can absorb a relative displacement of a concrete structure in an earthquake or the like. On the other hand, when a flexible joint is used, the waterproof sheet may not be able to follow the displacement of the flexible joint and may be damaged. It is attached via butyl rubber tape.

  However, when a concrete structure provided with a flexible joint as described above by the open-cut method is constructed underground, the earth and sand buried between the concrete structure and the groove wall tend to be in an unlanding state. Butyl rubber tape tends to be subjected to uneven surface pressure through the waterproof sheet. In addition, the butyl rubber receives a force that is pushed into the concrete structure side by water pressure acting between the flexible joint and the end of the waterproof sheet. In general, butyl rubber has moderate adhesiveness and rebound resilience, so that it can prevent inundation while following uneven surface pressure. Thus, there is a problem that a gap is generated between the butyl rubber tape and the flexible joint or the waterproof sheet, and the concrete structure and the waterproof sheet are submerged.

  An object of the present invention is to provide a waterstop material that ensures waterstop over a long period of time in consideration of the above facts. Moreover, it aims at providing the water stop structure of the elastic joint which applied this water stop material.

  In order to achieve the above object, a waterproof material according to claim 1 of the present invention is disposed between an end side of a waterproof member disposed on an outer periphery of a waterproof body and the waterproof body, and is waterproof. A waterproofing material that prevents water from entering from the end side of the member, and is disposed between the end side of the waterproof member and the waterproof body, and has an adhesive property that extends in the end portion extending direction of the waterproof member. An adhesive elastic member, and disposed between the end side of the waterproof member and the waterproof body, and at least on the opposite end side of the waterproof member with respect to the adhesive elastic member. And a hard elastic member extending in the present direction and having a hardness higher than that of the adhesive elastic member.

Next, the operation of the water stop material according to claim 1 will be described.
In the waterstop material according to the present invention, the adhesive elastic member and the hard elastic member are disposed between the end of the waterproof member and the waterproof body. For example, in a state where the adhesive elastic member and the hard elastic member are subjected to non-uniform surface pressure from the outside through the end side of the waterproof member and are in close contact with the waterproof member and the waterproof body, from the end side of the waterproof member When water pressure acts on the adhesive elastic member to the opposite end side, the adhesive elastic member having adhesiveness arranged in close contact with the waterproof member and the waterproof body causes water to enter between the waterproof member and the waterproof body. To prevent. In addition, the adhesive elastic member receives a force pushed to the opposite end side of the waterproof member by water pressure, but is restrained by the waterproof member, the waterproof body, and the hard elastic member, so that the shape of the adhesive elastic member is maintained. Thus, the waterproofness between the waterproof member and the waterproof body is ensured over a long period of time.

  The waterproof material according to claim 2 of the present invention is the waterproof material according to claim 1, wherein the waterproof material is between the end of the waterproof member and the waterproof body and more waterproof than the adhesive elastic member. It has a foreign matter intrusion prevention member that is disposed on the end side of the member, extends in the end portion extending direction of the waterproof member, and prevents foreign matter from entering the adhesive elastic member from the end side of the waterproof member. It is said.

Next, the operation of the water stop material according to claim 2 will be described.
In the waterstop material according to the present invention, a foreign matter intrusion preventing member that prevents foreign matter from entering the adhesive elastic member from the end portion side of the waterproof member is disposed closer to the end portion side of the waterproof member than the adhesive elastic member. For example, if the foreign matter intrusion prevention member receives a non-uniform surface pressure from the outside through the end side of the waterproof member and is in close contact with the waterproof member and the waterproof body, the foreign matter from the end side of the waterproof member Can be prevented from entering the adhesive elastic member.

  The water-stop material according to claim 3 of the present invention is the water-stop material according to claim 1 or 2, wherein the hard elastic member is at least the waterproof member between the adhesive elastic member and the waterproof body. It has a base part extended to the opposite end part side of a member, and a projection part arranged on the opposite end part side of the waterproof member of the adhesion elastic member, and extended from the base part to the waterproof member side.

Next, the operation of the water blocking material according to claim 3 will be described.
In the waterstop material of this claim, the hard elastic member has a base part and a projection part. For example, if the adhesive elastic member and the base part are in close contact with each other, the adhesive elastic member can be arranged only by placing the hard elastic member on the waterproof body at the time of construction on site, etc. To do.

  The waterstop material according to claim 4 of the present invention is the waterstop material according to claim 3, wherein the base portion extends to an end side of the waterproof member, and the foreign matter intrusion preventing member and the waterproof body are provided. It is characterized by being arranged between.

Next, the operation of the water blocking material according to claim 4 will be described.
In the waterstop material according to the present invention, the base portion extends from between the adhesive elastic member and the waterproof body to between the foreign matter intrusion prevention member and the waterproof body. For example, if the adhesive elastic member and the base part, and the foreign matter intrusion prevention member and the base part are in close contact with each other, the adhesive elastic member and Since the foreign substance intrusion prevention member can also be arranged, the work efficiency on the site is further improved.

  The water-stopping material according to claim 5 of the present invention is the water-stopping material according to claim 3 or claim 4, wherein the protrusion is viewed in a cross section in a direction perpendicular to the longitudinal direction of the adhesive elastic member. It is characterized by narrowing toward the waterproof member side.

Next, the effect | action of the water stop material of Claim 5 is demonstrated.
In the present invention, the protrusion is narrower toward the waterproof member in the cross section in the direction orthogonal to the longitudinal direction of the adhesive elastic member. For example, when the protrusion is subjected to non-uniform surface pressure from the outside via the end side of the waterproof member and is closely attached to the waterproof member, the waterproof member and the waterproof member of the protrusion from the shape of the protrusion described above Since the contact pressure with the end portion on the side increases (that is, the protrusion bites into the waterproof member), the force for restraining the adhesive elastic member by the waterproof member, the waterproof body, and the hard elastic member is improved.

  The waterproof material according to claim 6 of the present invention is the waterproof material according to any one of claims 1 to 5, and can be bonded to the waterproof body at least on the waterproof body side of the hard elastic member. An adhesive member is arranged.

Next, the operation of the water blocking material according to claim 6 will be described.
In this claim, an adhesive member that can be bonded to the waterproof body is disposed on the waterproof body side of the hard elastic member. Therefore, the work of attaching the hard elastic member to the waterproof body is facilitated.

  The water stop structure of the elastic joint according to claim 7 of the present invention is disposed along the joint of the opposing concrete structure, absorbs the relative displacement of the concrete structure, and connects the concrete structure. An elastic joint that covers the outer periphery of the concrete structure and the outer periphery of the end of the elastic joint, and prevents water from entering from the outside, and between the end of the waterproof member and the elastic joint The water-stopping material according to any one of claims 1 to 6, which is disposed in close contact with each other.

Next, the operation of the water stop structure of the elastic joint according to claim 7 will be described.
In this claim, an elastic joint is disposed along the joint of the concrete structure, and a waterproof member is coated on the outer periphery of the concrete structure and the outer end of the elastic joint, and the elastic joint is connected to the concrete structure. The water stop material mentioned above is arranged in between.
Therefore, for example, in a state where the adhesive elastic member and the hard elastic member are subjected to nonuniform surface pressure from the outside via the end portion side of the waterproof member, the adhesive elastic member is changed from the end portion side to the opposite end portion side of the waterproof member. When water pressure acts, the adhesive elastic member prevents water from entering between the waterproof member and the concrete structure. At this time, the adhesive elastic member receives a force pushed to the opposite end side of the waterproof member by water pressure, but is restrained by the waterproof member, the elastic joint, and the hard elastic member, so that the shape of the adhesive elastic member is maintained. Thus, the waterproofness between the elastic joint and the waterproof member is ensured over a long period of time.

  The water stop structure of the elastic joint according to claim 8 of the present invention is the water stop structure of the elastic joint according to claim 7, wherein the elastic joint can fit the water stop material at a position where the water stop material is disposed. It is characterized by providing a concave portion.

Next, the operation of the water stop structure of the elastic joint according to claim 8 will be described.
In this claim, the recessed part which can fit a water stop material in advance in the arrangement position of the water stop material of an elastic joint is formed. Therefore, the work of arranging the water-stopping material on the elastic joint is facilitated, and the water-stopping material can be reliably arranged at the position where the water-stopping material is arranged.

  The water-stopping material of the present invention ensures water-stopping properties over a long period of time. Moreover, the water stop structure of the elastic joint of the present invention ensures the water stop between the elastic joint and the waterproof member over a long period of time.

[First Embodiment]
(Configuration) Next, a first embodiment of a water stop structure of an elastic joint that secures water stoppage between the elastic joint and the waterproof member by applying the water stop material of the present invention will be described with reference to FIGS.

(Concrete underground structure)
As shown in FIG. 1, a cylindrical concrete underground structure 20 is constructed at a predetermined depth from the ground surface 66. These concrete underground structures include so-called box culverts, underdrains, and the like, which are mainly used for roadways, railways, waterways, passages, wiring paths such as cables, and the like. The concrete underground structure 20 has a substantially rectangular outer shape and inner shape when viewed in a cross section in a direction (width direction: arrow W direction) perpendicular to the longitudinal direction (arrow L direction). The outer shape and inner shape of the cross section may be chamfered at the corners, and the outer shape and inner shape may be other than the shapes described above (for example, a circle, an ellipse, a polygon, etc.).

  The concrete underground structure 20 may be constructed by sequentially connecting a cylindrical concrete structure 20A having a predetermined length, which has been molded in advance, in the field, and in the formwork at the field. It may be configured such that concrete is cast, a concrete structure 20A having a predetermined length is molded, and these are sequentially connected and built. Usually, these construction methods are properly used depending on the size of the concrete underground structure 20. Note that the concrete structure 20A of the present embodiment is formed by casting concrete on site.

(Elastic joint)
As shown in FIG. 2, a band-shaped elastic joint 30 is disposed along the joint 20 </ b> B of the opposing concrete structure 20 </ b> A. In addition, FIG. 2 is sectional drawing which looked at the concrete underground structure 20 from the perpendicular direction (arrow V direction). The elastic joint 30 is disposed on the outer surface of the concrete structure 20A, and an inverted trapezoidal valve 32 having a hollow portion 32A on the inner side, and a wing portion 34 extending from the bottom 32B of the valve 32 in both directions of the arrow L, It has a projection 36 extending from the wings 34 on both sides to the anti-waterproof member side, and a bulging portion 38 having a trapezoidal cross section provided on the tip side of the projection 36.

  In addition, the base 32B and the wing | blade part 34 of the valve | bulb 32 are arrange | positioned so that it may become linear with respect to the outer surface of 20 A of concrete structures. Further, the upper side of the valve 32 is disposed at least on the joint 20B. Furthermore, the protrusion 36 and the bulging portion 38 are embedded in the concrete structure 20A. For this reason, the concrete structures 20 </ b> A are connected to each other through the elastic joint 30. Here, when the joint 20B of the concrete structure 20A opens (opens in the direction of the arrow L), the elastic joint 30 extends in the direction of the arrow L to absorb the relative displacement of the concrete structure 20A, and the concrete structure When the joint 20B of 20A is relatively displaced in the arrow W direction, the elastic joint 30 extends in the arrow W direction and absorbs the relative displacement of the concrete structure 20A. At this time, the protruding portion 36 and the bulging portion 38 are prevented from coming off from the concrete structure 20A.

Further, the non-vulcanized butyl rubber 40 having excellent adhesiveness with the concrete structure 20A is attached to the interface between the wing portion 34 and the concrete structure 20A so that water is not generated from the interface between the elastic joint 30 and the concrete structure 20A. It is preferable. The non-vulcanized butyl rubber 40 is attached to the interface between the protruding portion 36 and the concrete structure 20A or the interface between the bulging portion 38 and the concrete structure 20A, thereby further connecting the elastic joint 30 and the concrete structure 20A. Water stoppage at the interface is improved.
In addition, although the elastic coupling 30 of this embodiment is set as the structure formed with chloroprene rubber, it shall not be limited to this structure.

(Waterproof sheet)
As shown in FIG. 2, the outer periphery of the concrete underground structure 20 is covered with a waterproof sheet 50 having excellent waterproof properties. The waterproof sheet 50 has a length from the end side of the wing part 34 of one elastic joint 30 to the end side of the wing part 34 of the other elastic joint 30, and the end side of the waterproof sheet 50 is The elastic joint 30 is fixed to the end portion side of the elastic joint 30 through the water blocking material 10.
Moreover, as a material of this waterproof sheet 50, it is preferable to use EVA (ethylene-vinyl acetate copolymer), urethane, or the like. In addition, the waterproof sheet 50 of this embodiment is formed from EVA.

(Waterproof material)
As shown in FIG. 3, a band-shaped waterstop material 10 is disposed between the end portion side of the waterproof sheet 50 and the end portion side of the elastic joint 30. The water blocking material 10 is disposed on the hard elastic member 12 extending in the extending direction of the end portion 50A of the waterproof sheet 50, and on the surface of the hard elastic member 12 on the waterproof sheet side, and extends along the end direction of the end portion 50A. And an adhesive elastic member 14 that extends and a foreign matter intrusion prevention member 16.

  The hard elastic member 12 includes a base portion 12A and a protruding portion 12B, and the adhesive elastic member 14 and the foreign matter intrusion preventing member 16 are disposed on the surface of the base portion 12A. The protruding portion 12B extends from the base portion 12A to the waterproof sheet side, and has a width that is narrower from the base portion 12A to the waterproof sheet side when viewed in a cross section perpendicular to the longitudinal direction of the hard elastic member 12. In addition, although the projection part 12B of this embodiment is a cross-sectional triangle shape, it is not necessary to be limited to this structure, A cross section may be a semicircle shape and a cross section may be a polygonal shape. In the present embodiment, the protrusions 12B are provided at two positions with a predetermined interval. Further, the hardness of the hard elastic member 12 is set higher than the hardness of the adhesive elastic member 14. Furthermore, the material of the hard elastic member 12 is CR, SBR, NBR, NR, EPDM, synthetic rubber, or a mixed hardness of 40 to 65, an elongation of 500% or more, and a tensile strength of 2. It is preferable to use a vulcanized rubber of 5 Mpa or more. In addition to the material of the hard elastic member 12 described above, a molded product having a hardness of 40 to 65, an elongation of 500% or more, and a tensile strength of 1.5 Mpa or more containing a thermoplastic resin having rubber elasticity as a component. It may be used. In addition, the hard elastic member 12 of this embodiment is formed from SBR.

  The adhesive elastic member 14 is disposed in close contact with the base portion 12A on the end side of the waterproof sheet 50 with respect to the protruding portion 12B. When a plurality of protrusions 12B are provided as in this embodiment, the adhesive elastic member 14 is also provided corresponding to each protrusion 12B, and the arrangement is always on the end side of the waterproof sheet 50. The material of the adhesive elastic member 14 is modified butyl rubber, unvulcanized butyl rubber, asphalt, vulcanized or non-vulcanized synthetic rubber containing an adhesive, and has a penetration of 25 to 65 and an elongation of 800. It is preferable to use a molded product of% or more. In addition, the adhesive elastic member 14 of this embodiment is formed from modified butyl rubber.

  The foreign matter intrusion preventing member 16 is disposed in close contact with the base portion 12 </ b> A closest to the end of the waterproof sheet 50 of the water blocking material 10. The foreign matter intrusion prevention member 16 is made of a material such as polyethylene, polystyrene, PV, EVA, or the like and EPDM, CR, SBR, NR, or the like as a raw material in order to prevent dirt or the like from entering the adhesive elastic member 14. It is preferable to use a molded product having a closed cell structure with a 10 to 25-fold foam. In addition, the foreign material penetration | invasion prevention member 16 of this embodiment is formed from the polyethylene expanded 10 times.

  Furthermore, an adhesive member 52 is disposed between the base portion 12A and the elastic joint 30 to fix the base portion 12A and the elastic joint 30 together. As a material of the adhesive member 52, butyl rubber or the like is preferably used.

Further, the distance extending from the base portion 12A toward the waterproof sheet is set to be the same for the hard elastic member 12 and the foreign matter intrusion preventing member 16, and the adhesive elastic member 14 is set to be shorter than these members. .
The end side of the waterproof sheet 50 is pressed against the protrusion 12B, the adhesive elastic member 14, and the foreign matter intrusion prevention member 16. Further, an adhesive member 54 is disposed between the waterproof sheet 50 and the foreign matter intrusion preventing member 16, and the waterproof sheet 50 and the foreign matter intrusion preventing member 16 are fixed. As a material of the adhesive member 54, it is preferable to use butyl rubber or the like.
Further, a recessed portion 34 </ b> A is formed on the end side of the wing portion 34 of the elastic joint 30. The recessed portion 34A has a size that allows the waterstop material 10 to be inserted.

Next, the construction procedure of the concrete underground structure 20 will be briefly described.
First, as shown in FIG. 4, the ground surface is dug down to a predetermined depth for constructing the concrete underground structure 20 to form a groove 60. At this time, it is preferable to form the concrete retaining wall 62 made of concrete inside the groove wall so that the groove wall does not collapse. Next, a mold frame is arranged at a predetermined position of the groove 60, and concrete is placed in the mold frame to mold a concrete structure 20A having a predetermined length. At this time, the concrete structure 20A and the elastic joint 30 are integrally formed after the concrete is dried by embedding a part of the elastic joint 30 on the end side of the concrete structure 20A. Then, a new concrete structure 20A is molded so as to face the concrete structure 20A. At this time, by embedding the remaining portion of the elastic joint 30 on the end side of the new concrete structure 20A, the concrete structures 20A are connected to each other after the concrete is dried. The connection of the concrete structure 20A is sequentially performed in the above-described procedure. Further, since the elastic joint 30 is formed in a band shape, the elastic joint 30 is connected by vulcanization at the site. It should be noted that the elastic joint 30 may be divided into a plurality of pieces and vulcanized and joined on site.

  Further, after the concrete structure 20A is molded, the waterproof sheet 50 is covered on the outer periphery of the concrete structure 20A. At this time, between the end side of the concrete structure 20 </ b> A and the elastic joint 30, the waterstop material 10 is fitted into the recess 34 </ b> A and attached using the concave portion 34 </ b> A provided on the end side of the elastic joint 30 as a guide. After the concrete underground structure 20 is built, the earth and sand 64 is backfilled from the top of the concrete underground structure 20 to restore the ground surface to the original state. In this way, a concrete underground structure is constructed underground.

(Operation) Next, the operation and effect of the first embodiment will be described.
Since the concrete underground structure 20 of the present embodiment is constructed according to the above-described procedure, the hard elastic member 12, the adhesive elastic member 14, and the foreign matter intrusion prevention member 16 are uneven due to the end side of the waterproof sheet 50. Uneven surface pressure is received from the backfilling soil 64 in the state. In addition, water pressure acts on the adhesive elastic member 14 from the end side of the waterproof sheet 50 to the opposite end side, and the adhesive elastic member 14 receives a force pushed into the opposite end side of the waterproof sheet 50 by water pressure. Since the member 14 is restrained by the waterproof sheet 50, the elastic joint 30, and the hard elastic member 12, the shape of the adhesive elastic member 14 is maintained, and the close contact arrangement between the waterproof sheet 50 and the elastic joint 30 is maintained. For this reason, the water immersion from the edge part side of the waterproof sheet 50 is stopped. Therefore, the waterproofness between the waterproof member and the waterproof body is ensured over a long period of time.

  In addition, since the foreign matter intrusion prevention member 16 is disposed in close contact with the waterproof sheet 50 and the elastic joint 30, foreign matter can be prevented from entering the adhesive elastic member 14 from the end side of the waterproof sheet 50. Thereby, the fall of the adhesive force of the adhesive elastic member 14 by mixing earth and sand etc. in the adhesive elastic member 14 can be suppressed.

  Furthermore, if the adhesive elastic member 14 and the base portion 12A and the foreign matter intrusion preventing member 16 and the base portion 12A are in close contact with each other, only the operation of placing the hard elastic member 12 on the elastic joint 30 at the time of construction on site or the like. Since the adhesive elastic member 14 and the foreign matter intrusion prevention member 16 can be disposed, the work efficiency on the site is improved.

Furthermore, in the cross section in the direction orthogonal to the longitudinal direction of the adhesive elastic member 14, the protrusion 12B is narrowed toward the waterproof member, so that the ground pressure between the waterproof sheet 50 and the tip of the protrusion 12B is high. Therefore, the force which restrains the adhesion elastic member 14 by the waterproof sheet 50, an elastic joint, and the hard elastic member 12 improves.
An adhesive member 52 that can be bonded to the elastic joint 30 is disposed on the elastic joint side of the hard elastic member 12. Therefore, the work of attaching the hard elastic member 12 to the elastic joint 30 is facilitated.
Furthermore, by forming the recessed portion 34A into which the water blocking material 10 can be inserted in advance at the position where the water blocking material 10 of the elastic joint 30 is disposed, the operation of placing the water blocking material 10 on the elastic joint 30 is facilitated, and the It can arrange | position to the arrangement position of the water material 10 reliably.

[Other Embodiments]
In the first embodiment, the adhesive elastic member 14 and the protruding portion 12B are arranged at two locations, respectively. However, the effect of the present invention can be obtained only by arranging at one location. Since the water-stopping property is improved, the adhesive elastic member 14 and the protruding portion 12B may be disposed at one or a plurality of locations without being limited to the configuration of the first embodiment.
In the first embodiment, the waterproof sheet 50 is configured to cover the outer periphery of the concrete structure 20A and the elastic joint 30. However, the waterproof sheet 50 is not limited to this configuration, and the concrete structure 20A or the elastic joint 30 is not limited thereto. The waterproof sheet 50 may be arranged only on a part of the outer periphery of the waterproof sheet 50. Even in this case, the waterproof sheet 50 and the concrete are provided by providing the water stop material 10 along the extending direction of the end of the waterproof sheet 50. It is possible to stop water from entering between the structure 20 </ b> A or the elastic joint 30.

It is a perspective view showing typically the concrete underground structure of a 1st embodiment. It is the fragmentary sectional view which looked at the jointing vicinity of the concrete underground structure of 1st Embodiment from the perpendicular direction. FIG. 3 is a partial enlarged cross-sectional view in which the vicinity of a water blocking material in FIG. 2 is enlarged. It is a partial section perspective view showing the state before refilling a concrete underground structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water stop material 12 Hard elastic member 12A Base part 12B Protrusion part 14 Adhesive elastic member 16 Foreign material intrusion prevention member 20A Concrete structure 20B Joint 30 Elastic joint 34A Concave part 50 Waterproof sheet (waterproof member)
52 Adhesive members

Claims (8)

A waterproofing material disposed between the end of the waterproof member disposed on the outer periphery of the waterproof body and the waterproof body to prevent inundation from the end of the waterproof member,
An adhesive elastic member disposed between the end side of the waterproof member and the waterproof body, and having an adhesive property extending in the end portion extending direction of the waterproof member;
Between the end side of the waterproof member and the waterproof body, and disposed at least on the opposite end side of the waterproof member than the adhesive elastic member, extends in the end portion extending direction of the waterproof member, A hard elastic member having a higher hardness than the adhesive elastic member;
A waterstop material characterized by comprising:   The waterproof member is disposed between the end side of the waterproof member and the body to be waterproofed and closer to the end of the waterproof member than the adhesive elastic member, and extends in the direction in which the end of the waterproof member extends. The water-stopping material according to claim 1, further comprising a foreign matter intrusion prevention member that prevents foreign matter from entering the adhesive elastic member from the end side of the adhesive. The hard elastic member includes a base portion extending at least on the opposite end side of the waterproof member from between the adhesive elastic member and the waterproof body;
A protruding portion that is disposed on the opposite end side of the waterproof member of the adhesive elastic member and extends from the base portion toward the waterproof member;
The water-stop material according to claim 1 or 2, wherein   The water stop material according to claim 3, wherein the base portion extends toward an end of the waterproof member and is disposed between the foreign matter intrusion prevention member and the waterproof body.   5. The waterstop material according to claim 3, wherein the protrusion portion is narrowed toward the waterproof member side when viewed in a cross section in a direction orthogonal to the longitudinal direction of the adhesive elastic member. .   The waterstop material according to any one of claims 1 to 5, wherein an adhesive member capable of adhering to the waterproof body is disposed at least on the waterproof body side of the hard elastic member. An elastic joint disposed along the joint of the opposing concrete structure to absorb relative displacement of the concrete structure and to connect the concrete structure;
A waterproof member that covers the outer periphery of the concrete structure and the outer periphery on the end side of the elastic joint, and prevents water from entering from the outside;
The water-stop material according to any one of claims 1 to 6, wherein the waterproof member is disposed in close contact between the end portion side of the waterproof member and the elastic joint.
A water stop structure for an elastic joint, comprising: The said elastic coupling is provided with the recessed part which can insert the said water stop material in the arrangement position of the said water stop material, The water stop structure of the elastic joint of Claim 7 characterized by the above-mentioned.

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