JPH011822A - Continuous water-stop wall construction method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a continuous water-stop wall (mountain retaining wall) construction method.

(Conventional technology and its problems) Conventionally, when constructing a continuous water-stop wall (mountain retaining wall), a groove was excavated while a self-hardening stabilizing liquid was injected, and a frame (stressed material) was constructed.
was inserted into the groove to solidify the self-hardening stabilizing liquid together with the frame, and by repeating the above operations, the water stop wall was extended to the specified length and shape, and then excavated on the side where the underground structure was planned. At that time, the surface of the water-stop wall was scraped to expose the surface of the frame on the side where the underground structure was planned, forming a space for the underground pickle structure.

However, there were problems in that the water-stopping properties of the water-stopping wall were insufficient in some areas due to insufficient solidification of the self-hardening stabilizing liquid and the incorporation of soil clods into the self-hardening stabilizing liquid.

To solve this problem, a method has been proposed in which a continuous plate of plastic material that spreads along the wall is embedded in the wall section (Japanese Patent Publication No. 53-22367); It was not clear how to embed the plates in the wall sections and how to connect the continuous plates of plastic material embedded in the wall sections, making it difficult to implement. Furthermore, continuous plates of plastic material must be manufactured to fit within the wall section, resulting in high material and processing costs.

This invention was made in view of these problems, and its purpose is to use inexpensive materials in a continuous water-stop wall construction method in which a frame is inserted into a groove for reinforcement. It is an object of the present invention to provide a method of embedding and connecting a water-stopping wall in a wall section using the water-stopping method, thereby making the water-stopping property of a water-stopping wall more simple and inexpensive.

(Means for Solving the Problems) In order to achieve the above object, the present invention involves inserting a pre-assembled frame into a section of trench that is excavated while filling it with a stabilizing liquid, and allowing the stabilizing liquid to harden. Then, repeat the same construction in a section that is continuous with the section to form a water cutoff wall, excavate the ground on the underground structure construction side, and cut the water cutoff wall down to the surface of the frame on the underground structure construction side. In the continuous water-stop wall construction method, an impermeable seam is placed on the surface of the pre-assembled frame opposite to the underground structure construction side! At the same time, take an extra length at the end of the water-impermeable sheet, turn the extra length along the frame to the surface on the underground structure construction side, and lock it to the surface of the underground structure. After cutting the water wall down to the surface of the frame on the underground structure construction side, release the extra length that is locked to the surface of the frame on the underground structure construction side, and place it next to it. It was joined to the extra length.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a plan view showing the construction order of this embodiment.

In this construction order, first, as shown in FIG.
Excavate to a predetermined depth while injecting 4.

In this state, a frame 16 in which H-beams are arranged side by side is assembled and prepared in the above-ground part, as shown in FIG. 2(b). This frame 16 has connecting members (not shown) disposed laterally, thereby making the whole frame 16 integral.

Then, as shown in the same figure (C), the slot 1 of the frame 16 is
2, an impermeable sheet 18 is pasted over the entire surface of the frame 16 on the surface opposite to the underground structure construction side. At that time, the water-impermeable sheet 18 has an extra length 20 at its end, and this extra length 20 is attached to the frame 16.
1-1 type located at the end of! The extra length 20 is bent and fixed from the outside along the shape of the mold, and finally the extra length 20 is
After being inserted into the groove hole 12, it is brought to the flange portion 23 of the T1 type steel 22 on the surface that will be the underground structure construction side. And this [
] The extra length part 20 located at the flange part 23 of the shaped steel 22 is made to be in a state where it can be easily released from the fixation to the flange part 23, and its length is set so that after it is inserted into the slot 12, the frame inserted adjacently The length should be such that it can be joined to the extra length of the sheet pasted on. Impermeable sea]
-18 may be made of a material that does not allow water to pass through and is flexible, such as a synthetic resin sheet such as a vinyl sheet or a polyethylene sheet.

Next, as shown in FIG. 4(d), the frame 16 is inserted into the slot 12 before the self-hardening stabilizer 14 hardens.

After the frame 16 has been inserted and the self-hardening stabilizing liquid 14 has hardened, as shown in FIG.
The process of excavating slots 12 in consecutive sections and inserting frames 16 is repeated.

After drilling the groove hole 12 of a predetermined length and shape in this way and hardening the self-hardening stabilizing liquid 14 together with the frame 16,
As shown in FIG. 2(f), the ground on the side where the underground structure is planned is excavated, and at that time, the surface of the water stop wall 24 is scraped to expose the part of the frame 16 on the side where the underground structure is planned. Create a space for building things. The surface of the frame 16 on the side where the underground structure is planned will be exposed later by standing up on this surface and attaching struts, etc. ), and if it is not necessary, it is sufficient to simply scrape the surface of the flange portion 23 of the shaped steel 22.

Next, the portion of the extra length portion 20 located at the flange portion 23 of the H-shaped steel 22 is released from the fixation to the flange portion 23 and bent to the opposite side, and is placed along the shaved surface of the hardened self-hardening stabilizer 14. The extra length portions 20 adjacent to each other with the joint portion 26 in between are also aligned along the scraped surface of the self-hardening stabilizer 14, and the overlapping portions of these extra length portions 20 are adjusted to the total height of the water stop wall 24. The welded portion 28 is formed by continuously welding in the height direction. FIG. 2 is a perspective view showing a state in which the extra lengths 20 of adjacent water-impermeable sheets 18 are welded together.

The processing of this embodiment is completed by welding the extra lengths 20 of the water-impermeable sheet 18 to each other at all joints of the water-stopping wall 24.

Continuous water cutoff wall 24 by the continuous water cutoff wall construction method according to the present invention
Since the water-impermeable sheet 18 is continuously stretched over the entire surface of the wall, there may be places where the water-stopping properties of the water-stopping wall are insufficient due to failure of solidification of the self-hardening stabilizing liquid or the mixing of soil clods into the self-hardening stabilizing liquid. However, the water-stopping properties of the water-stopping wall are sufficient because the water flow is blocked by the water-impermeable sheet stretched at that location.

In addition, since the end portion of the water-impermeable sheet 18 is welded to the end portion of the adjacent water-impermeable sheet 18 at the extra length portion 20, the end portion of the water-impermeable sheet 18 and the adjacent water-impermeable sheet 18
The water-tightness between the ends of the pipe is also sufficient.

In addition, water-impermeable sheets can be obtained at a lower cost than continuous plates made of plastic materials, and can be easily processed by cutting them with scissors to match the frame surface. Water-impermeable sheets are flexible and bend easily, so they can accommodate this error.

In this embodiment, the extra length portions are joined by welding, but they may be joined continuously in the height direction over the entire height of the water stop wall, such as by using an adhesive.

Further, in this embodiment, a self-hardening stabilizer was used as the stabilizing liquid, but a non-self-hardening stabilizer may be used, and after inserting the frame, a solidifying agent may be injected and stirred to solidify the stable liquid.

Note that the end of the frame 16 [the flange portion 2 of the type 1 steel 22]
By placing a cover over the extra length 20 of the water-impermeable sheet 18 located at 3, this water-impermeable sheet 18
The surface of the water-stop wall 24 on the side of the planned underground structure can be scraped to expose the frame 16 without damaging the extra length 20 of the frame 16.

(Effects of the invention) In this invention, a water-impermeable sheet is stretched on one side of the frame, an extra length is left on the water-impermeable sheet, and the surface of the water-stop wall on the side where the underground structure is planned is scraped off. After that, the extra length of the water-impermeable sheet is welded to each other, so the water-stopping properties of the water-stopping wall can be more easily achieved at a lower cost. The watertightness between the ends of the water-impermeable sheet is also perfect.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the construction order in one embodiment of the present invention, and FIG. 2 is a perspective view showing a state in which the extra lengths of adjacent water-impermeable sheets are welded together in the embodiment shown in FIG. It is a diagram. 12... Slot 14... Self-hardening stabilizer 16... Frame 18...
...Water-impermeable sea 1-20...excess length
24...Water stop wall 28...Welded part

Claims (1)

[Claims] The pre-assembled frame is inserted into a section of trench that has been excavated while being filled with stabilizing liquid, and after the stabilizing liquid has hardened,
A continuous stop is formed by repeating similar construction in a section that is continuous with the section to form a water stop wall, excavating the ground on the underground structure construction side, and cutting the water cut wall down to the surface of the frame on the underground structure construction side. In the water wall construction method, a water-impermeable sheet is pasted on the opposite side of the underground structure construction side of the pre-assembled frame, and an extra length is taken at the end of the water-impermeable sheet, and the extra length is used as a frame. After turning the water stop wall along the edge to the surface on the underground structure construction side and locking it to the surface, and cutting the water stop wall to the surface on the underground structure construction side of the frame, A method for constructing a continuous water-stop wall, characterized in that the extra length that is locked to a surface on the building side is released from the lock and joined to the extra length that is located next to it.