JPH04323412A - Construction of cutoff wall - Google Patents

Abstract

PURPOSE:To provide a highly reliable cutoff effect by continuously arranging sheetlike members, in which both side parts and the lower end part are formed into continuous bag bodies and their insides are filled with a filler, in a groove. CONSTITUTION:Both the side parts and the lower end part of a sheetlike member 1 are formed into continuous bag bodies 2a-2c, and their insides are filled with a filler. Then respective sheetlike members 1 are continuously arranged in a groove, excavated underground, so that the fellow joint parts of the adjoining sheetlike members 1 can mutually adhere. Then the bag bodies 2a-2c are expanded with a filler, and the fellow bag bodies 2a and 2b at side parts are made to mutually adhere over the upper and the lower ends in the groove at the joint parts of the sheetlike members 1. Also the bag bodies 2c are made to adhere to the groove bottom part over both side parts at the lower end part of the sheetlike member 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a water cutoff wall, which is a continuous impermeable wall, within an embankment body or foundation ground.

0002

[Prior Art] Conventionally, in order to prevent seepage and leakage of water flowing through the embankments of river embankments, coastal embankments, water storage embankments, etc. and the foundation ground, continuous impermeable structures have been installed in the embankments and foundation grounds. We are trying to install a water-stop wall. This cutoff wall is constructed using concrete, asphalt, steel sheet piles, or impermeable clay/sheets.

[0003] When constructing such a cutoff wall, for example, when constructing it using a sheet, a trench is excavated from the ground to the impermeable layer over the permeable layer of the foundation ground, and the sheet is inserted into this trench. The sheets are inserted one by one and arranged so that the ends of the sheets overlap, and a water stop treatment is applied to the joint portion of each sheet and the lower end of each sheet. The conventional water-stopping treatment structure for seats is as follows:
At the same time as overlapping the joint parts of adjacent sheets, the diameter of the groove around the joint part of the sheets is expanded, and this enlarged diameter part is filled with a hardening agent such as mortar to make the joint parts of the sheets stick together. A certain level of water-stopping performance is achieved by placing a filling material at the bottom of the groove around the lower end.

0004

[Problems to be Solved by the Invention] However, the above-mentioned conventional water-stop walls using sheets have the following problems in terms of reliability of water-stop performance. That is, in the case of constructing a deep water-stop wall, even if the joint parts of the sheets are overlapped and this part is brought into close contact with the filler filled in the enlarged diameter part of the groove, As the grooves become deeper, the edges of the sheet curl up, and water may seep in or leak from the curled edges.

[0005] Furthermore, at the lower end of the sheet, a casting pipe is required to cast the filler material, and if the groove becomes deep, the casting pipe must be inserted deeply, which requires large-scale equipment and construction. Since the filling material is simply placed, there is a problem in that the packing effect is low.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a method of constructing a water-stop wall that can obtain a highly reliable water-stop structure.

[0007]

[Means for Solving the Problems] A method for constructing a water-stop wall according to the present invention includes forming both sides and the lower end of a sheet-like member into a continuous bag body, and filling the inside of the bag body with a filler material. ,
The above problem is solved by arranging each sheet-like member continuously in the groove in such a manner that the joint portions of adjacent sheet-like members are brought into close contact with each other.

[0008]

[Operation] According to the method of constructing a water-stop wall of the present invention, at the joint portion of the sheet inserted into the groove, the bags at the sides are expanded by the internal filler, and the upper and lower ends are expanded within the groove. They are in close contact with each other, and at the lower end of the sheet, the bag expands due to the internal filler and is in close contact with the bottom of the groove across both sides, resulting in a highly reliable water-stopping structure.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

FIG. 1 shows the structure of a sheet (sheet-like member) used in the present invention. As shown in FIG. 1, the sheet 1 is made of a cloth material such as a water-impermeable vinyl sheet for civil engineering. This sheet 1 has bag bodies 2a and 2b having a length reaching the upper and lower ends at both ends of the upper end. Further, a bag body 2c is formed at the lower end of the sheet 1 and has a length that reaches both side ends. This bag body 2c is provided continuously at least on one side of the bag body 2a at both end portions,
The insides are interconnected. These bags 2a, 2b, 2
C is filled with a filler 4 such as mortar. These bags 2a, 2b, 2c are made by folding back both sides of the sheet 1 to form a bag shape, or by folding back the lower end to form a bag shape, and the tip edge of each folded portion is formed by folding back the sheet 1.
It is formed by continuously adhering to the surface of.

As shown in FIG. 2, in the sheet 1 having such a shape, the bags 2a and 2b at the side ends are expanded by the filler 4 inside at the joint portion of the sheet 1 inserted into the groove 10. are in close contact with each other in the groove 10 over the upper and lower ends, and as shown in FIG. 3, at the lower end of the sheet 1,
The bag body 2b expands due to the filling material 4 inside and comes into close contact with the bottom of the groove 10 across the left and right ends, thereby providing a highly reliable water-stopping structure.

Next, a construction procedure for constructing a water-stop wall using the sheet 1 exhibiting water-stop performance as described above will be explained with reference to FIGS. 4 to 9.

(1) Vertical holes 11 are excavated at predetermined intervals from the ground into the foundation ground prior to excavating trenches 10 (see FIG. 4). Each vertical hole 11 is excavated to a depth beyond the permeable layer to the impermeable layer. (2) Excavate the groove 10 and install the sheet 1 in the groove 10 (
(See Figures 5 and 6). To excavate the groove 10, for example, as shown in FIG.
A groove 10 is excavated with a wire saw using the steel 30 as a guide. Once trench 10 has been excavated, erect sheet 1,
H steel 30 will be removed. According to this drilling method, 10 to 3
It is possible to excavate a thin groove 10 of about 0 mm, which is extremely effective for inserting the sheet 1. (3) excavating the adjacent groove 10 in the same manner as above;
Insert the sheet 1 into the groove 10 (see FIG. 7). (4) The bags 2a, 2b, 2c of the sheet 1 are filled with a filler 4 such as mortar (see FIG. 8). The filler 4 is press-fitted into the bag 2b from the upper end opening of the bag 2b at the end of the sheet 1. Further, the filler material is press-fitted into the bag body 2a from the upper end opening of the bag body 2a at the opposite end of the sheet 1, and the filler material 4 is filled up to the bag body 2c at the lower end. In parallel with this, inside the vertical hole 11, groove 1
The muddy water accumulated inside the tank is pumped out to the ground using a pump or other means. By filling the filler 4 into the bag 2a, the bag 2a expands, and the bags 2a and 2b in the vertical hole 11 come into close contact with each other, as shown in FIG. 8(a). Furthermore, as shown in FIG. 8(b), the bag body 2c is in close contact with the groove 10. After draining the muddy water in groove 10, drain groove 1 as shown in Figure 9.
The solidifying agent 20 or the like is filled into the voids of 0 to fill the voids. As a result, a space between the vertical holes 11 and 11 of the water-stop wall is constructed. (5) Build a water stop wall by repeating the steps (1) to (4) above. As a result, the adjacent sheets 1, 1 are integrated, and a continuous water-stop wall with no gaps is constructed.

According to this embodiment, the filling material filled in the bags 2a, 2b, 2c at the joint portion of the sheets 1, 1 reliably fills the inside of the vertical hole 11, and these bags 2a, 2b are placed above and below each other. Since it is in close contact across the edges, a highly reliable water-stopping structure can be obtained. Furthermore, as the grooves 10 become deeper, the lower edge of the sheet 1 does not curl up, causing a problem such as loss of water-stopping performance.

[0015] Furthermore, since the filler material is also fed into the bag body 2c at the lower end of the sheet 1, the material for packing the lower end of the sheet 1 (such as mortar) does not come off, and the sheet 1 can be reliably packed.

Furthermore, the bags 2a, 2b, 2c of the sheet 1
can be processed in advance at a factory, eliminating the need for on-site work such as overlapping the joint portions of the sheets 1 and 1 and pressing them together as in the past. In addition, since the filler for packing the lower end of the sheet 1 can be fed through the upper opening of the bag body 2, equipment such as a pouring pipe that reaches the bottom of the groove 10 is not required, and the on-site equipment or on-site work is simple. Become something.

[0017]

[Effects of the Invention] As explained above, according to the present invention, the following excellent effects can be achieved. At the joint portion of the sheet-like member, the bag expands due to the internal filling material and comes into close contact with each other across the upper and lower ends within the groove, and at the lower end of the sheet-like member, the lower end portion of the bag expands due to the internal filling material. Since it expands and comes into close contact with the bottom of the groove across both ends, a highly reliable water-stopping structure can be obtained. In particular, the bag body is formed continuously from both sides of the sheet-like member to the bottom end, and the filling material can be fed and filled into the inside of the bag body densely and reliably, and there is no possibility of deviation of the filling material. Therefore, reliable packing action can be obtained. Furthermore, the bag of the sheet-like member can be pre-processed in a factory, etc., and it is also easy to fill the bag of the sheet-like member into the groove with filler at the site, simplifying the construction on-site. It has the advantage of being able to transform into

[Brief explanation of drawings]

FIG. 1 shows one embodiment of the present invention, and is a perspective view of a sheet-like member.

FIG. 2 is a horizontal sectional view showing a part of the water-stop wall.

FIG. 3 is a front sectional view showing a part of the water stop wall.

FIG. 4 is a construction procedure diagram of a water-stop wall.

FIG. 5 is a construction procedure diagram of a water-stop wall.

FIG. 6 is a construction procedure diagram of a water-stop wall.

FIG. 7 is a construction procedure diagram of a water-stop wall.

FIG. 8 is a construction procedure diagram of a water-stop wall.

FIG. 9 is a front sectional view of the water stop wall.

[Explanation of symbols]

1 Sheet-like member 2a Bag body 2b Bag body 2c Bag body 4 Filling material 10 groove 11. Standing hole.

Claims (1)

[Claims] Claim 1: A method for constructing a water cutoff wall in which a water cutoff wall is constructed by excavating a trench underground and continuously arranging water-impermeable sheet-like members in the trench, wherein each sheet Both sides and the lower end of the sheet-like member are formed into a continuous bag, the inside of the bag is filled with a filler, and the sheet-like member is
1. A method of constructing a water-stop wall, which comprises continuously arranging joint portions of adjacent sheet-like members in the groove in a manner that they are brought into close contact with each other.