JPH0442496B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an underground continuous water-blocking method.

[Problems to be solved by this invention]

Construct underground walls or install sheet piles to prevent groundwater from springing up during construction of underground structures, or to stop groundwater during dam construction. Construction methods have been adopted, such as placing the pipe in place and pouring it into the joint.

When these conventional construction methods are used for construction purposes only to stop water, the following problems arise.

○B Underground continuous walls are usually built with a wall thickness greater than necessary, making the construction unnecessarily large-scale and using a large amount of excess concrete, resulting in high construction costs.

○B The method of driving sheet piles and pouring into the joints also requires extensive construction and is expensive in material cost.

○C It is possible to make the wall thickness thinner in order to reduce construction costs for underground continuous walls, but there are no machines that can excavate narrow trenches, and even if a narrow trench could be dug, it would be difficult to make the wall thinner. A homogeneous underground wall cannot be completed due to the loss of fluidity.

○D Also, from the point of view of water stoppage certainty and reliability,
Cracks during earthquakes impair the water-stopping properties of concrete walls, and construction methods using precast concrete panels or sheet piles were unable to obtain sufficient water-stopping performance due to contaminants, bentonite, etc. being trapped in the joints.

An object of the present invention is to provide an underground continuous impermeable wall construction method that is easy to construct, has low construction cost, and can construct an impermeable wall that is highly reliable and reliable in stopping water.

[Means to solve the problem]

The continuous underground impermeable wall construction method according to the present invention uses an adhesive to connect adjacent impermeable sheets.

Attach vertically continuous adhesive to the left and right ends of one surface of the water-shielding sheet. For the water-shielding sheets that are adjacent to each other on the left and right, a patch car that is continuous in the vertical direction is arranged on the side of the sheet, corresponding to the facing portions of the adhesive material.
The packer is inflated and the adhesive material on both sheets is pressed together, making adjacent sheets continuous and partitioning them to the left and right in the groove width direction. A water-blocking wall will be constructed within this trench.

In addition, hardening material is injected into the groove to solidify the muddy water.
It is also possible to construct water-tight walls. It may be filled with soil mortar.

In addition, a hardening material is filled in the packer and expanded, and the packer is left in the trench and buried to become part of the water-blocking wall.

[Effect]

The construction involves digging trenches, installing a water-shielding sheet, solidifying mud, or filling with soil mortar, making the construction simple and unnecessary.

Because a water-blocking sheet is installed, water-blocking properties are ensured regardless of cracks, etc.

Since the water-blocking sheets are connected by bonding adhesives, connection can be easily performed.

〔Example〕

Hereinafter, this invention will be explained in detail based on an embodiment shown in the drawings.

<1> Trench excavation Excavate trench 1 in the ground. The width of the groove 1 does not need to be large, so the construction does not require a large scale. An auger or the like is used to excavate the groove 1, and the groove 1 is filled with muddy water 2 as a stabilizing liquid.

<2> Water-shielding sheet A polyethylene sheet or the like can be used as the water-shielding sheet 3. Adhesives 4, 4 are attached to both left and right ends of one surface of the water-blocking sheet 3 in a continuous manner in the vertical direction. Asphalt rubber or the like can be used as the adhesive 4, and a release paper 5 is stuck on the adhesive 4. A release rope 6 is tied to the lower end of the release paper 5.

<3> Lowering the water-shielding sheet (Fig. 2) Lower the water-shielding sheet 3 into the groove 1. The ends of the water-blocking sheet 3 are overlapped with the water-blocking sheet 3 that has already been lowered, and the adhesives 4, 4 are made to face each other.

A long bag-shaped packer 7 is lowered into the groove 1 together with the water-blocking sheet 3. A weight 8 is attached to the lower end of the packer 7, and is integrated with left and right wire ropes 10, 10 by a connecting band 9.

The pack car 7 has an air blowing port 11 on the side of the lower part as shown in FIG.
The upper end of the drain port 13 protrudes to the outside of the pack car 7.

Patsuka 7 is the adhesive material 4, 4 for the waterproof sheets 3, 3.
Correspondingly, the adhesive material 4 of one of the water-shielding sheets 3 is arranged on the back side of the surface on which it is attached.

<4> Adhesion of water-shielding sheets (Figures 3 to 6) After arranging the water-shielding sheets 3, 3 and the packer 7 in the groove 1 as described above, pull the release ropes 6, 6 to attach the release paper 5. , 5 from the adhesive 4, 4.

Mud water is injected into the packer 7 to expand the packer 7, and the waterproof sheets 3, 3 are pressed against the inner wall of the groove 1 to bond the adhesive materials 4, 4 together. The water-blocking sheets 3, 3 are connected in the above manner.

<5> Solidification of muddy water (Fig. 4) A hardening material 14 such as mortar or concrete is injected into the muddy water 2 in the groove 1 partitioned by the pack car 7 to solidify the muddy water and construct an impermeable wall.

After the muddy water has solidified, the pressure water in the pack car 7 is discharged and the pack car 7 is recovered. With the pack car 7 as shown in FIG. 9, air can be injected from the air inlet 11 and water can be discharged from the pack car 7 through the air hose 12.

In the case of soil with good self-supporting properties such as rocks, waterless excavation is possible without the need for muddy water, and the filler in the trench after sheet placement is not solidified with muddy water, but filled with soil mortar.

<6> Burying the packer In addition to the invention described above, the packer 7 may be filled with a hardening material such as mortar and hardened, and then buried in the groove 1 to serve as a part of the water-shielding wall.

〔Effect of the invention〕

The present invention has the above configuration and can obtain the following effects.

○B. Construction is easy, as it only involves digging a trench, placing a water-shielding sheet, solidifying the muddy water, or filling it with soil mortar, and there is no need for large-scale construction, making the construction cost low.

○B The completed water-stopping wall will have a water-stopping sheet sandwiched inside, so even if a crack occurs due to an earthquake, the water-stopping will not be impaired, making it more reliable and reliable.

○C Because it is constructed by solidifying muddy water or filling it with soil mortar, the entire underground wall can be made into a uniform underground wall. Furthermore, even if there is a portion where the strength is reduced, water-stopping properties are ensured by the water-blocking sheet as described above.

○D Waterproof sheets are easily connected because they are connected by pressing adhesives together.

○If the hardening material is filled in a hot pack car and buried, there will be no need to collect it, making construction even easier.

[Brief explanation of the drawing]

Figures 1 to 8 show the construction order of this invention,
Figures 1, 2, 4, and 6 to 8 are perspective views, are plan views, Figures 3 and 5 are perspective views, and Figure 9 is a partially cutaway perspective view of the pack car. It is a diagram. 1...Gutter, 2...Muddy water, 3...Waterproof sheet, 4
... Adhesive, 5... Release paper, 7... Packer.

Claims (1)

[Scope of Claims] 1. Adhesive material is attached vertically and continuously to the left and right ends of one surface of one surface of the water-shielding sheet suspended in a groove formed in the ground, and the adhesive materials are placed facing each other on the left and right adjacent water-shielding sheets. Then, a patch car that is continuous in the vertical direction is placed on the side of the sheet corresponding to the joining part of both sheets, and the patch car is inflated and the adhesive material of both sheets is pressed together to connect the adjacent sheets. This method is characterized by dividing a trench into left and right sides in the width direction, and constructing a water-blocking wall within the trench. 2. The underground continuous impermeable wall construction method according to claim 1, wherein the impermeable wall is constructed by injecting a hardening material into the trench to solidify the muddy water. 3. The underground continuous impermeable wall construction method according to claim 1, wherein the impermeable wall is constructed by filling the trench with soil mortar. 4 Fill the inside of the pack with hardening material and expand it.
4. The underground continuous impermeable wall construction method according to claim 1, 2 or 3, wherein the underground continuous impermeable wall is buried in a trench to form a part of the impermeable wall.