JPS63304831A - Construction work of underground continuous cut-off wall - Google Patents

Abstract

PURPOSE:To easily construct an underground continuous cut-off wall by a method in which a sheet cartridge incorporated with a water-stop sheet is lowered into a trench, the sheet is pulled out and set in the trench, and mud water is solidified. CONSTITUTION:A water-stop sheet 19 is folded and housed into the fold grooves of a sheet cartridge 12 having the fold grooves continued vertically which are formed by many parallel partition plates. The sheet 19 is fixed through detachable space rod at the fold partition of the bottom of its grooves. The cartridge 12 is lowered into a trench 1 excavated in the ground, a wire 26 is pulled while drawing the space rod to draw out the sheet 19, and the sheet 19 is set in the trench 1 by partitioning the widthwise direction of the trench 1. The packer of the sheet 19 is expanded to partition the trench 1, a hardener is injected into the trench 1 to harden mud water, and the cut-off wall is continuously constructed in the same way.

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]

In order to prevent groundwater from springing up during construction of underground structures, or to stop groundwater during dam construction, it is necessary to construct an underground continuous wall, or to inject sheet piles into the sloped area. 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 requiring a large amount of extra concrete, increasing construction costs.

Similarly, the construction method of pouring into the joint by driving a sheet pile and pouring into the joint requires large-scale construction and high material costs.

C. It is possible to make the wall thickness thinner in order to reduce the construction cost of an underground continuous wall, but there is no machine that can excavate a narrow trench, and even if a narrow trench could be dug, it would be difficult to make the wall thinner. A physical underground wall cannot be completed due to the loss of fluidity.

Second, from the point of view of water-stopping reliability and reliability, cracks in concrete walls during earthquakes impair water-stopping performance, and construction methods that use precast concrete panels or sheet piles have contaminants, bentonite, etc. in the joints. It was not possible to obtain sufficient water-stopping performance.

This invention is easy to construct and has low construction costs.
It is an object of the present invention to provide an underground Vt water-blocking construction method that is capable of constructing a water-blocking wall with high reliability and certainty of water stoppage.

[Means for solving problems]

The underground continuous impermeable wall construction method according to the present invention uses a sheet cartridge in which a folding groove portion continuous in the vertical direction is formed by a plurality of parallel partitions.

The water-blocking sheet is folded and stored between each folding groove. The water-shielding sheet is fixed through a removable space rod through the bent portion located at the bottom of each folding groove of the water-shielding sheet.

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

Pull out the water-blocking sheet from the sheet 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 methods 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 sheet cartridge and lowered into the groove, it is easy to work without the water-shielding sheet becoming tangled.

〔Example〕

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

(11 trench excavation A trench 1 is excavated in the ground. A drilling device A as shown in FIG. 7 can be used to excavate the trench 1. First, a plurality of drilled holes 2 are formed in the ground at appropriate intervals, A guide post 3 of the drilling equipment A is set up in this drilling hole 2. A drive unit 4 of the drilling equipment A
can move 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. A chain 8 having a bit 7 attached to the outer periphery of the saw part 6 is rotatable. The drive unit 4 is lowered while being filled with muddy water 9, and the hole 2 is drilled by rotating the tuner 8.
．． Dig a narrow groove l between the two.

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

(2) Sheet Cartridge In the drawing, 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 inside a substrate 13 having a semicircular cross section. A rod-shaped guide member 16 is fixed to the tip of the partition plate 14. At the lower end of the sheet cartridge 12, a bottom portion 17 is formed of expanded metal. bottom 17
On the top, a retainer for partitioning the folding groove portion 15 is fixedly attached near the substrate 13.

In the figure, 19 is a water-blocking sheet, and a polyethylene sheet or the like can be used. As shown in FIG. 11, the water-shielding sheet 19 has a long bar-shaped sheet joiner 2 at either the left or right end.
0. A sheet joiner 21 having a C-shaped cross section is attached to the other end. A pocket-shaped cover 22 is adhered to the water-shielding sheet 19 near the sheet joiner 21, and a long bag-shaped backer 23 is inserted into the cover 22.

The water-blocking sheet 19 as described above is folded and stored in the folding groove l5 of the sheet cartridge 12. The folded portion of the water-blocking sheet 19 is positioned at the bottom of each folding groove 15, and the space rod 24 is passed through the folded portion to fix the water-blocking sheet 19. The lower end of the space rod 24 is positioned between the stopper 18 and the substrate 13 to prevent it from falling off.

(3) Water-shielding sheet arrangement The water-shielding sheet 19 is lowered into the groove 1. As described above, the water-shielding sheet 19 is lowered into the groove 1 while being fixed in the sheet cartridge 12, and the elongated rod-shaped retractable joiner 25 is fitted into the sheet joysonar 21 of the water-shielding sheet 19. . (FIG. 15) A plurality of wires 26 are tied to this pull-in joiner 25, and these wires 26 are hung on a sheave 28 in a pull-in post 27, which is a steel pipe.
being pulled upwards. (FIG. 14) When the sheet cartridge 12 is lowered into the groove 1, the retraction post 27 is also lowered into the groove 1 in parallel. (Fig. 2) If there is already a water-shielding sheet 19 placed in the groove l, fit the sheet joiner 20 of the water-shielding sheet 19 that is lowered into the sheet joiner 21 of the existing water-shielding sheet 19. while descending. The double-sided water sheets 19 and 19 are connected by sheet joiners 20 and 21.

After the descent is completed, the wire 26 passed through the retraction post 27 is pulled to draw the water shielding sheet 19 closer. At this time, Fig. 10 (
1) As shown in (■), the space rods 24 are pulled out one after another to allow the water-blocking sheet 19 to be pulled out from the folding groove 15.

As described above, the water-shielding sheet 19 is arranged in the groove 1 so that the water-shielding sheet 19 partitions the groove 1 into left and right sides in the width direction. (FIG. 4) (4) Water or air is injected into the packer 23 of the muddy water solidification impermeable sheet 19 to inflate it, thereby partitioning the groove 1.

(Figures 5 and 16) A hardening material is injected into the groove l 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.

Furthermore, when muddy water is not used, the grooves may be filled with fill mortar.

〔Effect of the invention〕

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

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

Since the completed water-shielding wall has a water-shielding sheet sandwiched inside, water-stopping will not be impaired even if a crank occurs due to an earthquake, etc., increasing certainty and reliability.

C. Since it is constructed by solidifying muddy water or filling it with fill 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.

2. 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 the sheet is always placed and the installation work can be done 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 perspective view of the upper part of the sheet cartridge, and Figure 9 is a cut-out of the lower part of the sheet cartridge. A perspective view, FIGS. 10(I) and (II) are perspective views of the water-shielding sheet being pulled out from the sheet cartridge, FIG. 11 is a perspective view of the water-shielding sheet, and FIG. 12 is a plan view thereof.
Fig. 13 is a perspective view of the backer, Fig. 14 is a longitudinal sectional view of the retraction post, Fig. 15 is a perspective view of the retraction joiner fitted to the sheet joiner, and Figs. 16 (1) and (n) are FIG. 3 is a plan view of a state in which a groove is partitioned by a bunker. 1...Groove, 2...Drilling, 3...
・Guide post, 4... Drive section, 5. Old... Rack, 6... Saw section, 7... Bit,
8...Chain, 9...Muddy water, 10.
... Suction port, 11 ... Mud pumping hose, 1
2... Sheet cartridge, 13...
Substrate, 14... Partition plate, 15 Old... Folding groove, 16... Guide material, 17... Bottom, 18... Removal prevention, 19 ...Waterproof sheet, 20.21 ...Sheet joiner-122
・Old...Cover, 23...Puff car, 24...
... Space rod, 25 ... Retraction joiner - 126 ... Wire, 27 ... Retraction post, 28 Old sheave, A ... drilling rig. Number 1! ! ! Figure 2 Figure 3 @ Figure 4 Figure 5 Figure 6 Figure 8 Figure 1 Figure 9 Figure 10 (I) (It)

Claims (1)

[Claims] A water-shielding sheet is folded into a sheet cartridge in which vertically continuous folding grooves are formed by a plurality of parallel partition plates, and the water-shielding sheet is stored between each folding groove. A water-shielding sheet is fixed through a removable space rod on the curved 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 to partition the trench into left and right sides in the width direction. An underground continuous impermeable wall construction method characterized by constructing an impermeable wall by placing it in a trench and solidifying muddy water or filling the trench with soil mortar.