JP6548455B2 - Water stop structure of continuous wall - Google Patents

Description

  The present invention relates to a water blocking structure of a continuous wall provided in the ground, and more particularly to a water blocking structure at a longitudinal connection portion of continuous wall members constituting the continuous wall.

As a method of constructing a continuous wall in the ground, for example, there is a steel underground continuous wall method described in Patent Document 1.
The structure of the conventional continuous wall is shown in FIG.
This continuous wall comprises a continuous wall member a built in an excavated part excavating the ground, and a solidified body b made of a filler material filled in the excavated part (FIG. 5 (a)).

The connecting wall member a is an H-shaped steel material, and has a shape in which joints are provided at both ends of the flange. The continuous wall can be extended in the lateral direction by sequentially connecting the connecting wall members a in the lateral direction (the latitudinal direction / the planar direction) via the joint.
Further, the connection in the longitudinal direction (longitudinal direction / depth direction) of the connecting wall member a can be performed by a method of on-site welding or a method of bolting via a connecting plate c.

  The solidified body b is generally made of a method using a filler such as soil mortar obtained by in-situ soil agitation or concrete substituted from a stabilizer by a stabilizer drilling method.

The continuous wall may be used not only as a temporary earth retaining wall but also as an outer wall of an underground structure to be constructed later. In this case, more reliable water blocking is required between the continuous wall members constituting the continuous wall.
As a water stop measure at the connection point in the lateral direction of the connecting wall member a, grout injection is performed separately from the filling material between the joints by improving the fluidity of the filling material to make it easy to enter the gap between the joints. There is a method.

  On the other hand, the water stop measures in the connection part of the longitudinal direction of the connecting wall member a are not usually considered. This is considered to be because it is considered that waterproofness is naturally promised since the continuous wall member a is continuous in the longitudinal direction (longitudinal direction) of the continuous wall member a.

JP, 2014-101709, A

However, when connecting plate c is used for connection in the longitudinal direction of connecting wall member a, connecting wall member a is also after connection by factors such as design convenience of connecting wall member a and deformation of connecting wall member a. In many cases, a gap d is generated at the connection point of (Fig. 5 (b)).
Then, when the continuous wall member a is exposed by the excavation on the excavation side ground, the water may flow into and out of the continuous wall through the gap d, and the waterproofness may not be secured. Moreover, it is assumed that a solidified body in the vicinity of the connection portion of the connecting wall member a is likely to be structurally cracked, which causes water leakage.
Therefore, when the continuous wall formed by connecting the connecting wall member a by the attachment plate c is also used as the main body underground wall, it is necessary to separately secure the waterproofness of the connecting portion in the longitudinal direction of the connecting wall member a. there were.

  An object of the present invention is to provide a means capable of securing waterproofness even when a connecting plate is used for longitudinal connection of a connecting wall member.

The first invention of the present application made to solve the above problems is a water blocking structure of a continuous wall comprising at least a continuous wall member built in an excavating section excavating the ground, comprising a plurality of continuous wall members The pair of overhangs disposed so as to straddle from both sides of the connecting wall member at a position where the connecting plate and the connecting portion in the vertical direction of the connecting wall member do not interfere with the connecting plate. A plate and an elastic member attached to an end portion of at least one of the connecting wall members to be connected, the elastic members being all housed in the housing space formed between the pair of projecting plates; The water blocking portion is formed by an elastic member .

According to the present invention, the following effects can be obtained.
(1) Even in the case of using the contact plate for the longitudinal connection of the connecting wall members, it is possible to secure the water barrier property. Therefore, even if the continuous wall member is exposed by the ground excavating operation after construction of the continuous wall, problems such as water intrusion do not occur.
(2) Even if the gap between the connecting wall members is expanded after construction due to an unexpected problem, the gap can be continuously filled by the restoring action of the elastic member.
(3) Peeling and twisting of the elastic member can be further suppressed by providing the elastic member so as to cover the end of the connecting wall member.
(4) Providing a water stopping portion capable of suppressing peeling and twisting of the elastic member by providing a housing space for housing the elastic member at the end of the connecting wall member without interfering with the contact plate. Can.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic perspective view which shows the water stop structure of the continuous wall which concerns on this invention. Schematic which shows the structure of a water stop part. Schematic which shows the other shape example of a water stop part. Schematic which shows the other shape example of a water stop part. It is the schematic which shows the conventional continuous wall, (a) is a top view, (b) is a front view.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<1> Whole structure The structure of the water stop structure of the continuous wall which concerns on this invention is demonstrated, referring FIG. 1 and FIG.
The continuous wall according to the present embodiment is constructed by the continuous wall member 10 built in the excavated portion excavating the ground X, and the solidified body 20 made of the filling material filled in the excavated portion.

<2> Continuous Wall Member The continuous wall member 10 is a member corresponding to the core material of the continuous wall.
Well-known steel materials, such as H shape, I shape, and sheet pile shape, can be employ | adopted for the cross-sectional shape of a connecting wall member, and it does not specifically limit.
In the present embodiment, the connecting wall member 10 is an H-shaped steel material composed of the web 11 and the flange 12, and the flange 12 has a shape provided with a joint 13 for connecting to the other connecting wall member at both ends. It is presenting. The connection through the joint 13 allows the continuous wall to extend in the lateral direction.
The structure and shape of the joint 13 are also not particularly limited.

<3> Solidified Body The solidified body 20 is a member corresponding to the wall portion of the continuous wall.
For the solidified body 20, a filler such as a soil mortar obtained by in-situ soil agitation, concrete substituted from a stabilizer by a stabilizer drilling method, or the like is used.
The filling material keeps the table flow high from the start of excavation to the erection work of the continuous wall member 10 by combining the solidification retarder and the solidification accelerator, and has the property of rapidly solidifying after the construction of the continuous wall member 10 Is desirable.
By keeping the table flow of the filling material high during the installation work of the connecting wall member 10, the wraparound property of the filling material between the joints 13 of the connecting wall member 10 is improved, and the horizontal joint portion of the continuous wall is It can contribute to the improvement of water barrier properties.
Incidentally, as a method for realizing the above-mentioned characteristics, there is a method of adding a fluid retaining admixture such as Alonsoil (registered trademark).

<4> Attachment Plate The attachment plate 30 is a member used for connection in the longitudinal direction (longitudinal direction or depth direction) of the connecting wall member 10.
The contact plate 30 is disposed so as to sandwich the flanges 12 of the facing wall members 10 facing each other, and both are fastened with a bolt and a nut to connect and fix the wall members.

<5> Water stop part The water stop part 40 is a member for filling the clearance which arose in the connection place of the vertical direction of the connecting wall member 10. As shown in FIG.
The specific example of a water stop part is demonstrated below, referring FIG.

<5.1> Material Example As a material of the water blocking portion 40, a known elastic member 41 used as a water blocking seal for construction applications, such as rubber, water-expandable rubber, and sponge, can be used.

<5.2> Shape example The cross-sectional shape of the water stop part 40 can employ | adopt all aspects.
Although the elastic member 41 (41a, 41b, 41c) separated for each of the web 11, the flange 12, and the joint 13 constituting the connecting wall member 10 is used in FIG. 2, an integrally formed member may be used. .
Further, although not shown, a shape may be provided in which a lip is provided on the upper surface of the water blocking portion 40, or a shape may be provided in which a cavity is provided inside the water blocking portion 40.

<5.3> Arrangement Example The arrangement position of the water blocking portion 40 may be attached to the end of at least one of the continuous wall members 10 connected vertically.
That is, in the present invention, the water blocking portion 40 may be provided on only one side of the continuous wall member 10 connected in the longitudinal direction, or the water blocking portion 40 may be provided on both sides.
In addition, in FIG. 2, it is set as the aspect which attaches the water stop part 40 only to the upper end of the lower connecting wall member 10. As shown in FIG. This is because it can be considered as a method in which the mounting operation is simple and the water shut-off portion 40 can be mounted in an accurate position.
A known method such as a method of using an adhesive or a method of providing an adhesive surface on the bottom of the water blocking portion 40 may be appropriately selected as a method of attaching the connecting wall member 10 and the water blocking portion 40.
In addition, if the attachment work of the water blocking portion 40 is performed after temporarily fixing the attachment plate 30, the attachment plate 30 becomes a guide and the attachment operation becomes easy.

<6> Operation and Effect Refer to FIG. 1 again.
As shown in FIG. 1, the water blocking portion 40 provided on the lower connection wall member 10 is pressed and crushed at the end of the upper connection wall member 10, and the connection location in the vertical direction of the connection wall member 10 The gap created in is completely closed.
Therefore, even if the displacement of the connecting wall member 10 or the crack of the solidified body 20 occurs due to an unexpected problem after the continuous wall construction, the problem related to the intrusion of water does not occur.

A second embodiment of the present invention will be described with reference to FIG.
In the present embodiment, the elastic member 41 constituting the water blocking material 40 is shaped so as to be able to cover the end of the connecting wall member 10.
In addition, the elastic member 41 which concerns on a present Example can not be provided in the location which the contact plate 30 interferes after connection of the connecting wall member 10. FIG. Therefore, the elastic member 41 according to the present embodiment can be applied to the vicinity of the end portion of the flange 12 and the portion of the joint 13.
FIG. 3 shows an example of the elastic member according to the second embodiment.
In FIG. 3, the elastic member 41 c attached to the joint 13 of the connecting wall member 10 has a shape provided with a recess 411.
According to the structure which concerns on a present Example, the water stop part 40 which can further suppress peeling and twist of the elastic member 41 can be comprised.

A third embodiment of the present invention will be described with reference to FIG.
In the present embodiment, a housing space is provided at the end of the connecting wall member 10, and a part of the elastic member 41 is housed in the housing space.
FIG. 4 shows an example of the accommodation space according to the third embodiment.
In FIG. 4A, the overhanging plates 14 (FIG. 4A) provided on both side surfaces of the connecting wall member 10 form a housing space. Moreover, in FIG.4 (b), the groove | channel 15 (FIG.4 (b)) provided inside from the end surface of the connecting wall member 10 is made into the accommodation space.
According to the configuration according to the present embodiment, the water blocking portion 40 capable of further suppressing peeling and twisting of the elastic member 41 is provided on the entire surface of the end portion of the connecting wall member 10 without interference with the connection plate 30. be able to.

DESCRIPTION OF REFERENCE NUMERALS 10 serial wall member 11 web 12 flange 13 joint 14 overhang plate 15 groove 20 solidified body 30 attachment plate 40 water blocking portion 41 elastic member 411 recessed portion a continuous wall member b solid body c attachment plate d gap

Claims (1)

A continuous waterstop structure comprising at least continuous wall members built in an excavating section formed by excavating the ground,
A connecting plate for longitudinally connecting a plurality of continuous wall members;
A pair of overhanging plates disposed so as to straddle from both side surfaces of the continuous wall member at positions not interfering with the contact plate among the longitudinal connection points of the continuous wall member;
An elastic member attached to an end of at least one of the connecting wall members to be connected;
A water shut-off portion is formed by the elastic member entirely accommodated in the accommodation space formed between the pair of projecting plates.
Water barrier structure of continuous wall.

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