JPH0433325B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an underground continuous impermeable wall construction method.

[Problems to be solved by this invention]

To prevent groundwater from springing up during construction of underground structures, or to stop groundwater from flowing during dam construction, underground continuous walls are constructed, or sheet piles are placed and injected into joints. construction method has been adopted.

When these conventional construction methods are used only for the purpose of water stopping, 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 walls 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 can be dug, the concrete 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 for solving problems]

In the underground continuous impermeable wall construction method according to the present invention, a groove is formed in the ground, and the impermeable sheet wrapped around a shaft is vertically lowered into the groove. Move in the direction of the groove while pulling out the water shielding sheet from the winding shaft. This water-blocking sheet partitions the groove into left and right sides in the width direction. A water-shielding wall is constructed by hardening the muddy water in the trench or filling the trench with soil mortar and sandwiching a water-shielding sheet between them.

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.

〔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 The water-shielding sheet 3 can be made of polyethylene sheet, etc., and one end of the entire length is glued to a long rod-shaped sheet jointer 4. The entire length of the other end is bonded to a long sheet joiner 5 having a C-shaped cross section. In addition, the water-shielding sheet 3 is equipped with a sheet joiner 5.
A pocket-shaped sewn-in packer 9 is formed nearby.

This water-shielding sheet 3 is wound around a retraction jointer 6 that is a winding shaft. The retractable jointer 6 has a long rod shape, and has rotatable rings 7 at the upper and lower ends.
7 is attached, and wire attachment portions 8, 8 are provided protruding from the rings 7, 7. The retractable joiner 6 is fitted into the sheet joiner 5 having a C-shaped cross section, and the water-blocking sheet 3 is wrapped around the outer periphery of the retractable joiner 6 as shown in FIG.

Wire attachment portions 8, 8 of the retractable jointer 6
Connect wires 10, 10 to
0,10 is the sheave 1 of the cylindrical retraction post 11
2, 12. The wires 10, 10 extend above the retraction post 11.

<3> Lowering the water-shielding sheet (Fig. 1) The water-shielding sheet 3 is lowered into the groove 1. The water-blocking sheet 3 and the retraction post 11 wrapped around the retraction jointer 6 as described above are lowered into the groove 1. The water-shielding sheet 3 and the retraction post 11 are lowered apart from each other by a certain distance, and if there is a water-shielding sheet 3 already installed, the sheet jointer 5 is fitted into the retraction-joyner 6 of the existing water-shielding sheet 3. Combine and connect.

<4> Waterproof sheet arrangement (Fig. 2) Wire 1 extended above the retraction post 11
0 and 10 to pull the retraction joiner 6, which is the winding shaft, toward the retraction post 11. As the retractable jointer 6 is moved, the water-blocking sheet 3 is pulled out, and the groove 1 is separated so as to partition the groove 1 into left and right sides in the width direction.
Placed within.

<5> Packer (FIG. 3) Water or air is injected into the sewn-in packer 9 of the water-blocking sheet 3 to partition the groove 1.

<6> Solidification of muddy water (Fig. 4) A hardening material such as mortar or concrete is injected into the muddy water 2 in the trench 1 partitioned by the pack car 9 to solidify the muddy water and construct an impermeable wall.

After the muddy water solidifies, the retraction post 11 and the retraction jointer 6 are pulled up from the groove 1.

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.

〔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-blocking sheet, solidifying muddy water, or filling it with soil mortar, and there is no need for large-scale construction, resulting in low construction costs.

○B The completed water-shielding wall will have a water-shielding sheet sandwiched inside it, so even if cracks occur due to earthquakes, water-stopping will not be impaired, and reliability and reliability will be high.

○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.

[Brief explanation of drawings]

Figures 1 to 4 show an example of the construction order of the underground continuous impermeable wall construction method according to the present invention, in which () is a plan view, () is a vertical cross-sectional view, and Fig. 5 is an impermeable wall. FIG. 6 is a perspective view of the sheet, FIG. 6 is a plan view of the rolled up state, and FIG. 7 is a perspective view of the water-blocking sheet and the retractable post. 1...Gutter, 2...Muddy water, 3...Waterproof sheet, 4
... Seat joiner, 5... Seat joiner, 6... Retractable joiner, 9... Sewing jointer, 10... Wire, 11... Retractable post.

Claims (1)

[Claims] 1. Lower the water-shielding sheet wrapped around the winding shaft vertically into the groove formed in the ground, move it toward the groove while pulling out the water-shielding sheet from the hoisting shaft, and roll it into the groove so as to partition the groove into left and right sides in the width direction. An underground continuous impermeable wall characterized by constructing an impermeable wall with an impermeable sheet in between by arranging an impermeable sheet and hardening the muddy water in the trench, or by filling the groove with soil mortar. Construction method.