JPH0413499B2 - - 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]

Continuous underground walls are constructed to prevent groundwater from springing up during construction of underground structures, or to stop groundwater during dam construction. construction method has been adopted.

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.

The method of driving sheet piles and injecting 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 can be dug, the flow of concrete A physical underground wall cannot be completed because its properties are damaged.

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 water-blocking construction method that is easy to construct, has low construction costs, and can construct a water-blocking wall that is highly reliable and reliable.

[Means for solving problems]

The underground continuous impermeable wall construction method according to the present invention uses a sheet cartridge in which a vertically continuous folding groove is formed by a plurality of parallel partition plates.

The water-blocking sheet is folded and stored between each folding groove. The water-shielding sheet is fixed by passing removable space rods through the folded portions located at the bottom of each folding groove of the water-shielding sheet.

Dig a trench in the ground. The cartridge with the water-shielding sheet fixed thereto is lowered into this groove.

Pull out the water-blocking sheet from the seat cartridge while pulling out the space rod. A water-blocking sheet is placed inside the groove to partition the groove into left and right sides in the width direction. A water-blocking wall is constructed by injecting a hardening material into the groove and solidifying it, or by filling the groove with soil mortar.

It can be constructed by simple construction such as trench excavation, installation of water-shielding sheets, and solidification of muddy water, and construction costs can be reduced.

Even if cracks occur due to an earthquake, the water-stopping properties of the water-blocking sheet will not be impaired.

Since the water-shielding sheet is fixed to the seat cartridge and lowered into the groove, the water-shielding sheet does not get tangled and the work is easy.

〔Example〕

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

(1) Trench excavation Dig trench 1 in the ground. No. 7 is used for excavating trench 1.
A drilling rig A as shown in the figure can be used.
First, a plurality of drilled holes 2 are formed in the ground at appropriate intervals, and a guide post 3 is erected on the excavation device A within the drilled holes 2. The drive part 4 of the excavation device A is movable up and down along the rack 5 of the guide post 3. A saw part 6 whose one end is pivotally supported is attached to the drive part 4. The saw part 6 has a bit 7 on the outer periphery.
A chain 8 to which a chain 8 is attached is rotatably filled with muddy water 9 while lowering the driving part 4, and the rotation of the chain 8 excavates a narrow groove 1 between the drilled holes 2.

The excavated earth and sand are sucked together with muddy water 9 from the suction port 10 at the lower end of the guide post 3, and
The mud is discharged to the outside of the groove 1 through a pumping hose 11 that passes through the inside. If the trench wall is strong, it is possible to excavate it using an auger or the like without injecting mud.

(2) Sheet Cartridge In the figure, reference numeral 12 denotes a sheet cartridge, in which a vertically continuous folding groove portion 15 is formed by a plurality of parallel partition plates 14 on the inside of a substrate 13 having a semicircular cross section. There is. A rod-shaped guide member 16 is fixed to the tip of the partition plate 14. At the lower end of the seat cartridge 12, a bottom portion 17 is formed of expanded metal. A retainer 18 is fixed on the bottom 17 near the substrate 13 to partition the folding groove 15.

In the figure, 19 is a water-blocking sheet, and a polyethylene sheet or the like can be used. Waterproof sheet 19
As shown in FIG.
A letter-shaped seat joiner 21 is attached. A pocket-shaped cover 22 is adhered to the water-shielding sheet 19 near the seat joiner 21, and a long bag-shaped packer 23 is inserted into the cover 22.

The water-blocking sheet 19 as described above is folded and stored in the folding groove 15 of the sheet cartridge 12. The folded portion of the water-shielding sheet 19 is positioned at the bottom of each folding groove portion 15, and the water-shielding sheet 19 is fixed through the space rod 24 through this bent portion. The lower end of the space rod 24 is positioned between the stopper 18 and the board 13 to prevent it from falling off.

(3) Water-shielding sheet placement Lower the water-shielding sheet 19 into the groove 1. As described above, the water-shielding sheet 19 descends into the groove 1 while being fixed in the sheet cartridge 12, and the sheet joint inner 21 of the water-shielding sheet 19
A long rod-shaped retraction jointer 25 is fitted inside. (FIG. 15) A plurality of wires 26 are tied to this retraction joiner 25, and the wires 26 are hung on a sheave 28 in a retraction post 27, which is a steel pipe, and are pulled upward.
(FIG. 14) When the seat cartridge 12 is lowered into the groove 1, the retraction post 27 is also lowered into the groove 1 in parallel. (Figure 2) If there is already a water-shielding sheet 19 installed in the groove 1, the existing water-shielding sheet 1
The sheet joiner 20 of the water-shielding sheet 19 that is lowered is fitted into the seat joiner 21 of No. 9 while being lowered. Both water-shielding sheets 19, 19 are connected by sheet joiners 20, 21.

After the descent is completed, the wire 26 passed through the retracting post 27 is pulled to draw the water shielding sheet 19 closer. At this time, the space rods 24 are sequentially pulled out as shown in FIG. 10, so that the water-blocking sheet 19 can be pulled out from the folding groove 15.

As described above, the water-shielding sheet 19 is disposed within the groove 1 so that the water-shielding sheet 19 partitions the groove 1 into left and right sides in the width direction. (Figure 4) (4) Solidification of muddy water Water or air is injected into the cover 23 of the water-shielding sheet 19 to inflate it and partition the groove 1. (Fig. 5, Fig. 16) A hardening material is injected into the groove 1 to solidify the muddy water. (Figure 6) Mortar or concrete can be used as the hardening material.

After the mud solidifies, the trench 1 is excavated and the water-blocking sheet 19 is placed repeatedly to construct the water-blocking wall continuously. Also, when muddy water is not used, soil mortar may be filled in the groove.

〔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, installing 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, so even if a crack occurs during an earthquake, the water stoppage will not be compromised, increasing certainty and reliability.

C) Because the wall 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. The water-blocking sheet is fixed to the sheet cartridge and lowered into the groove, and is pulled out and placed in the groove at any time, so that the sheet is always installed and the installation work can be carried out smoothly.

[Brief explanation of drawings]

Figures 1 to 6 are perspective views showing the construction sequence of the present invention, Figure 7 is a perspective view of the groove being excavated, Figure 8 is a top perspective view of the sheet cartridge, and Figure 9 is a perspective view of the sheet cartridge. A cutaway perspective view of the lower part, FIG. 10 is a perspective view of the water-shielding sheet being pulled out from the seat cartridge, FIG. 11 is a perspective view of the water-shielding sheet, FIG. 12 is a plan view thereof, and FIG. 13 is a perspective view of the vehicle. 14 is a longitudinal sectional view of the retracting post, FIG. 15 is a perspective view of the retracting joiner fitted to the seat joiner, and FIG. 16 is a plan view of the groove being partitioned by the packer. 1...Groove, 2...Drilling, 3...Guide post,
4... Drive part, 5... Rack, 6... Saw part, 7
...bit, 8...chain, 9...muddy water, 10
... Suction port, 11 ... Mud pumping hose, 12 ... Sheet cartridge, 13 ... Board, 14 ... Partition plate, 15 ... Folding groove, 16 ... Guide material, 1
7...Bottom, 18...Removal prevention, 19...Waterproof sheet, 20, 21...Seat joiner, 22...
... Cover, 23 ... Police car, 24 ... Space rod, 25 ... Retraction jointer, 26 ... Wire, 27 ... Retraction post, 28 ... Sheave, A
...Drilling equipment.

Claims (1)

[Claims] 1. A water-blocking sheet is folded into a sheet cartridge in which vertically continuous folding grooves are formed by a plurality of parallel partition plates and stored between each folding groove, and the groove bottom of each folding groove of the water-blocking sheet is A water-shielding sheet is fixed through a removable space rod located at the bent part, and this sheet cartridge is lowered into a trench excavated in the ground, and while pulling out the space rod, the water-shielding sheet is pulled out, and the trench is moved from side to side in the width direction. An underground continuous impermeable wall construction method that is characterized by constructing an impermeable wall by placing it in a trench so as to partition the walls, solidifying muddy water, or filling the trench with soil mortar.