JP2001295268A - Cut-off construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cut-off construction method for positively stopping water at a construction joint part of an underground erected body or a joint part of an underground construction with high work efficiency. SOLUTION: A steel pipe 16 is disposed along the vicinity of the construction joint part of the underground erected body (a steel pipe sheet pile 10) or the joint parts 12, 12 of the underground construction, and after a bag material filled with a cut-off material and having properties which are permeable or dissolved or decomposed in the ground, is enclosed in the steel pipe 16, the steel pipe 16 is pulled out of the underground to leave the bag material filled with the cut-off material, underground. Underground water and the cut-off material rapidly react on each other, so that a gel material percolates around the construction joint part or the joint parts so exhibit a water stop effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stopping method, and more particularly, to a water stopping method in a joint portion, a joint portion, and the like of an underground structure and an underground structure in the field of civil engineering and construction.

[0002]

2. Description of the Related Art The underground excavation method using steel sheet piles is a method widely performed because of the ease of workability. There are gaps. After the completion of the driving, the gap serves as a water leak for the excavation side. Leakage during underground construction not only hinders the progress of work, but also imposes a large burden on the environment, such as land subsidence due to pumping of groundwater and river pollution due to the inflow of polluted wastewater. Therefore, stopping water leakage from the joint is an extremely important technique in the construction method using steel sheet pile. In addition, in recent years, there are many buildings including railways in the vicinity of the work site, and water stoppage technology is particularly important to prevent collapse of the building foundation due to land subsidence.

Conventionally, countermeasures against water leakage from the joints of steel sheet piles include:
It has been carried out by injecting a slurry of cement milk, water glass or the like into soil. Water stoppage work by this method stops water leakage by solidifying the soil. Also, there is a method of injecting a slurry of bentonite or polymer, but it takes time until the water stopping effect appears,
The slurry spilled out with the leak and was not efficient.

[0004] In the joint portion of the concrete wall, there is a fine gap of only a few mm called a cold joint between the concrete hit first and the concrete hit later. In addition, there are many very fine gaps on the concrete surface depending on the conditions of concrete adjustment such as the mixing ratio of the concrete and the amount of water. These are called capillaries, and after being completed together with the cold joint on the concrete wall underground, they are used to supply water to the inside of the vehicle. Moisture and moisture that enter through such a water supply are not only a problem of water leakage inside the underground vehicle, but also cause corrosion of reinforcement of concrete walls and deterioration of concrete walls accompanied by neutralization of concrete. This is an important issue that ultimately causes the strength of the underground vehicle that supports the entire structure to deteriorate.

Generally, in order to prevent water from entering from the outside, a waterproof film made of an organic material such as rubber is applied so as to cover the entire outer wall of the underground driving body. For structures where it is difficult to have water leakage in the underground, it is common practice to carry out waterproofing work using such a waterproof sheet and to further place a waterproof material inside the concrete wall. As a material of the waterproofing method applied for this purpose, vinyl chloride resin, rubber, and a swellable rubber-based material are known, and a plate-like or string-like waterproofing material is mounted on a concrete wall at the center. Water stop work is being carried out.

[0006]

However, the injection of slurry such as cement milk and water glass, which is performed in the conventional underground excavation method using steel sheet piles, takes time until the water stopping effect is developed. During that time, the slurry that flowed out along with the water leakage had a problem of contaminating the groundwater. Further, the slurry flows out along with the water leakage, and it is not efficient because a large amount of slurry is used. In addition, when using a soil hardening agent such as cement milk, water glass, etc., in order to solidify the soil and at the same time solidify the steel sheet pile, after the underground excavation work, it is difficult to pull out the steel sheet pile, and it adhered to the steel sheet pile. This makes it difficult to remove water-stopping agents such as soil and cement milk, making it difficult to regenerate steel sheet piles.

On the other hand, since the organic waterproofing membrane used in the underground building is in the form of a sheet, the degree of waterproofing depends on the seam treatment and welding technique of the sheet. In addition, the sheet may be cracked due to inaccuracies at the time of construction or conditions due to the environment thereafter, and a reliable water stopping effect cannot be expected. Further, since these waterproofing membranes are organic, they are necessarily accompanied by deterioration of the material over a long period exceeding several decades, so that the water stopping effect over a long period cannot be guaranteed.

Further, when the water-stopping material is placed inside the concrete wall, if the shape of the water-stopping material is plate-like, it is necessary to stand the water-stopper vertically at the center of the wall when the concrete does not harden. Was difficult. The rubber-based and swellable rubber-based materials are applied by applying a specified adhesive to a concrete wall, and the construction method is limited by the material. There is also a method of filling the hollow tube pre-installed in the center of the body wall with water-stopping material after water leaks from the wall, but this is also planned after the completion of the body. It was not enough in terms of cost and workability

The present invention relates to civil engineering work such as underground excavation using steel sheet piles, and joints, joints, and laminations of concrete on underground constructions of buildings, underground driving walls, and upper floor driving walls. In the water stop work in the parts, joints, etc.
An object of the present invention is to provide a water stopping method capable of effectively and surely exhibiting a water stopping effect over a long period of time. Another object of the present invention is to provide a construction method that reduces the load on the environment of the construction site, including the regeneration of steel sheet piles.

[0010]

Means for Solving the Problems In order to achieve the above object, the water stopping method of the present invention comprises: <1> arranging a steel pipe along the vicinity of a joint or a joint of an underground construction or underground building; After storing a water-permeable bag filled with a water-stopping material or having the property of dissolving or decomposing in the ground in the steel pipe, the steel pipe is pulled out and a bag-shaped material filled with a water-stopping material in the basement Is a water stoppage method characterized by remaining. <2> The water stopping method according to <1>, wherein the underground construction has a structure in which a plurality of steel sheet piles are continuously arranged. <3> The water stopping method according to <1>, wherein the underground structure is formed of a concrete wall. <4> The water-stopping method according to any one of <1> to <3>, wherein the water-stopping material is a granule of an organic water-stopping material or an inorganic water-stopping material. is there. <5> The above <1> to <4>, wherein the bag-like material is made of a fibrous material, a porous plastic sheet, or a material that dissolves or decomposes in the ground.
The water stop method according to any one of the above. <6> The inorganic water-stopping material is a bentonite-based inorganic water-stopping material, wherein <1> to <5> are used.
> The waterproofing method according to any one of the above. <7> The water stopping method according to any one of <1> to <6>, wherein the fibrous material is made of mesh fibers. <8> The water stopping method according to any one of <1> to <7>, wherein the bentonite-based inorganic water-stopping material is an activated calcium-type bentonite-based inorganic water-stopping material. is there.

In the present invention, a steel pipe is arranged along a joint or joint of an underground construction or an underground structure, and the steel pipe is filled with a water-stopping material, or is permeable or melted in the ground. After storing the bag-like material having the property of decomposing, if the steel pipe is pulled out and the bag-like material filled with the water-stopping material is left underground, the water-stopping material in the bag-like material remaining in the ground is grounded. It reacts and swells quickly with the water in it, and the resulting gel-like substance permeates along the joint or near the joint, and exhibits a water-stopping effect.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. FIG. 1 is an explanatory view showing an embodiment of a water stopping method for a steel sheet pile. FIG. 1 is a horizontal sectional view showing a state in which a steel pipe sheet pile 10 is driven into the soil. Before the steel sheet pile 10 is driven into the soil, it is desirable that a paste is applied to the facing surfaces of the sections 12, 12 using an application member such as a trowel. This paste is applied to complete the water stoppage of the seam portion until the water stop material supplied by the steel pipe gels and fills the steel sheet pile seam.

This paste is not particularly limited, and an organic paste and an inorganic paste can be used. However, it is difficult to stably expect a long-term water stopping effect with an organic paste. Inorganic pastes are preferred. The inorganic paste is preferably a water-stopping paste containing at least one or more of tongue alcohol or polyhydric alcohol and a natural or synthetic clay mineral exhibiting water swelling, and the water-swelling clay mineral is preferably bentonite. It is. The amount of the paste applied to the sections 12, 12 of the steel sheet pile 10 may be approximately 5 mm, and the width of the paste may be approximately 5 cm.

As shown in FIG. 2, a support member 1 is provided near the lower end of the outside of the steel pipe sheet pile 10 (around the section 12).
4 is fixed by welding. The support member 14 has a recess 18 into which a lower end of a steel pipe 16 having both ends opened can be fitted.
Is formed, and the lower surface side is formed in a tapered shape, and the lower end of the steel pipe 16 is fitted to the support member 14. Although not specifically shown, an annular support member is fixed to the steel pipe sheet pile 10 by welding at predetermined intervals in the longitudinal direction of the steel pipe 16, and the steel pipe 16 is inserted into the annular support member. Supported by the support member 14 with the steel pipe sheet pile 1
0. As shown in FIG. 1, the place where the steel pipe sheet pile 10 is disposed is near the section 12 of the steel pipe sheet pile 10.

Next, the steel pipe 14 is simultaneously driven into the soil together with the steel pipe sheet pile 10. In this case, since the lower surface of the support member 14 is formed in a tapered shape, the steel pipe sheet pile 10, the support member 14, and the steel pipe 16 are smoothly driven into the ground.

Thereafter, a bag 20 filled with a water-stopping material in the steel pipe 16 is charged. This bag-like material 20 may be any of a fiber, a plastic sheet and the like. In the case of fibers, especially synthetic fibers in terms of durability, cost, etc., for example,
Those made of polyester-based fibers and having appropriate water permeability, for example, a mesh-like polyester made of polyester, are suitable. In the case of a bag-like material formed of a plastic sheet, a vinyl chloride resin sheet or a polyolefin resin sheet (for example, a polyethylene resin sheet, a polypropylene resin sheet, or the like) having a large number of fine holes through which water can pass. Is preferred. In addition, materials that dissolve or decompose in the ground, such as PVA films, biodegradable plastics, and polylactic acid polymers, can also be used.

The water-stopping material to be filled in the bag 20 is preferably a granular one. As water quickly penetrates between the particles, it absorbs more water in a short time, swells and gels. As a result, an early water stopping effect can be obtained. As a material for the granules, any of an inorganic granular water-blocking material and an organic granular water-blocking material can be used. As the inorganic granular water-blocking material, a clay mineral having water swellability is suitable, and specific examples thereof include a smectite clay mineral and a swellable mica mineral, and may be a natural product or a synthetic one. These clay minerals may be used alone, but may be used in combination as long as they do not affect the water stopping effect. In the case of an organic granular water-blocking material, granular CMC is particularly preferred.

As the water-stopping material to be filled in the bag-like material 20, bentonite, which is one of smectite clay minerals, is particularly desirable. Bentonite includes sodium type and calcium type bentonite, and sodium type bentonite has a larger swelling property than calcium type bentonite. However, calcium-type bentonite has a property that the reaction to water is faster than sodium-type bentonite. Therefore, the bag 20
Activated calcium-type bentonite has excellent swelling properties and swelling speed, and is more desirable in view of the water stopping effect. Such activated calcium-type bentonite is prepared by, for example, adding 4 parts by weight of soda ash (sodium carbonate) to 100 parts by weight of calcium-type bentonite, adding water, kneading, and drying and pulverizing. can get.

After filling the water-stopping material into the bag-shaped material 20, the bag-shaped material is appropriately tied with a string, an iron wire, a number wire or the like so that the water-stopping material does not leak from the bag-shaped material. The size of the bag-like material 20 may be a size that can be inserted into the steel pipe 16 and that can easily be separated from the steel pipe 16 when the steel pipe 16 is pulled out of the soil.

After the bag 20 is put into the steel pipe 14,
When the steel pipe 14 is removed from the ground, as shown schematically in FIG. 3, the bag-like materials 20 filled with the water-stopping material remain in the ground in a state of being juxtaposed vertically. Then, when the discharged groundwater enters the inside of the bag-like material 20, the granular water-blocking material quickly reacts with water and swells, and the resulting gel-like substance is formed from the periphery of the bag-like material 20 into the steel pipe sheet pile. It penetrates into the vicinity of the section portions 12 and 12 of the steel sheet 10 to form a water-impermeable layer, and exhibits a water stopping effect in the section of the steel pipe sheet pile 10.

In the present embodiment, since groundwater permeates the bag 20 uniformly and from around the bag 20 having water permeability, it stops at the section portions 12, 12 of the steel pipe sheet pile 10. The water effect is exhibited efficiently and reliably. Therefore, after an appropriate curing period, the excavation work inside the steel pipe sheet pile 10 (A side in the figure) is started. Even if water leaks from the section after excavation, the gel-like substance generated from the water-stopping material along with the movement of the groundwater due to the water leakage moves to this section and fills the gaps, thus exhibiting the water-stopping effect. You.

After the predetermined excavation work is completed, the steel pipe sheet pile 10 is pulled out of the soil. In this case, when the water-stopping material is a granular organic water-stopping material such as CMC or a granular inorganic water-stopping material, even if the gel-like substance adheres to the steel pipe sheet pile 10, it does not solidify, and the steel pipe from the ground is not solidified. The work of pulling out the sheet pile 10 becomes easy, and the steel pipe sheet pile 10 can be safely and reliably pulled out after the fact. The original purpose of steel sheet pile driving is the erection up to the construction of the vehicle body. The work by injection of the water-stopping material generally used conventionally, so-called chemical injection,
In some cases, this results in the joining of steel pipe sheet piles, making it impossible to pull out the steel pipe sheet piles after the construction of the vehicle body.
In the water stopping method according to the present invention, the post trouble of the steel pipe sheet pile is avoided, and as a result, shortening of the construction period and regeneration of the steel sheet pile can be expected.

In the above-described embodiment, an example of a steel pipe sheet pile has been described as an example of an underground structure, but the present invention is not limited to the steel pipe sheet pile but may be a steel sheet pile such as a U-shaped steel sheet pile or a straight steel sheet pile. The same method as described above can be applied to the vicinity of the joint portion.

(Method of waterproofing an underground structure such as a concrete wall) A method of waterproofing an underground structure using a concrete wall will be described. After placing a steel pipe near the joint of the concrete wall and storing a bag-like material that is filled with a water-stopping material and that dissolves or decomposes in contact with water in the ground, When the steel pipe is pulled out and the bag-like material filled with the water-stopping material is left in the ground, a gel-like substance generated by reacting with water in the ground near the joint of the concrete wall causes the gel-like substance to be formed in the joint of the concrete wall. Efficient water stopping effect,
And it can be reliably demonstrated. Also in this water stopping method, the water stopping material and the bag-like material are the same as in the case described above using the steel pipe sheet pile as an example.

However, in the above-mentioned concrete wall waterproofing method, in order to arrange the steel pipe on the side of the already constructed underground structure, the steel pipe must be arranged along the seam regardless of whether the seam is horizontal or vertical. It is preferable to bury it. As a method of constructing the steel pipe afterwards, a method is preferred in which a cap is placed over the tip of the hollow steel pipe to drive the steel pipe after embedding, the water-stopping material is inserted, and the steel pipe is pulled out. If it is difficult to place or drive the steel pipe, it is preferable to fix the water-stopping material to the center of the concrete wall by nailing or the like.

[0026]

As described above, according to the first aspect of the present invention, the water-stopping material in the bag-like material remaining in the ground quickly reacts with the water in the ground and swells, resulting in a gel-like material. The substance permeates along with the movement of groundwater along the joint or near the joint, and exhibits a water stopping effect. In addition, when an inorganic water-blocking material is used as the water-blocking material, the water-blocking effect is exhibited for a long time, and there is no risk of polluting the environment even if the water-blocking material remains in the ground. In particular, if a bentonite-based inorganic water-blocking material is used as the inorganic water-blocking material, and furthermore, if activated calcium-type bentonite-based inorganic water-blocking material is used, the swelling properties and swelling speed of the water-blocking material are excellent. In addition, the water stopping effect is more efficiently exhibited. Furthermore, when the water-stopping material is an inorganic water-stopping material, the water-stopping effect is exhibited by the gel-like substance and it does not solidify in the ground, so it is easy to pull out the steel pipe sheet pile etc. from the ground. Becomes

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view of a main part showing one embodiment of the present invention.

FIG. 2 is a vertical sectional view of a main part of FIG.

FIG. 3 is an explanatory view showing a state after the steel pipe sheet pile according to the present invention is pulled out from the ground.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Steel sheet pile 12 Section part 14 Support member 16 Steel pipe 18 Depression 20 Bag-shaped material A Cutting area

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takaki Ikeda 18-2-707 Asahimachi, Izumiotsu-shi, Osaka (72) Inventor Kenichi Tamada 1-6-10 Miyakubo, Ichikawa-shi, Chiba F-term (reference) 2D049 FB03 FB11 FB12 FC03 FD01 FD05

Claims (8)

[Claims] 1. A steel pipe is arranged along a joint or a joint of an underground construction or an underground structure, and the steel pipe is filled with a water-stopping material and is water-permeable or melts or decomposes in the ground. A water stopping method comprising storing a bag-like material having a property and then drawing out the steel pipe to leave a bag-like material filled with a water-stopping material underground. 2. The waterproofing method according to claim 1, wherein the underground construction has a structure in which a plurality of steel sheet piles are continuously arranged. 3. The waterproofing method according to claim 1, wherein the underground structure comprises a concrete wall. 4. The water stopping method according to claim 1, wherein the water stopping material is a granule of an organic water stopping material or an inorganic water stopping material. 5. The bag according to claim 1, wherein the bag is made of a fibrous material, a porous plastic sheet, or a material that dissolves or decomposes in the ground. Water stopping method. 6. The water stopping method according to claim 1, wherein the inorganic water stopping material is a bentonite inorganic water stopping material. 7. The water stopping method according to claim 1, wherein the fibrous material is made of mesh fibers. 8. The water stopping method according to claim 1, wherein the bentonite inorganic water stopping material is an activated calcium type bentonite inorganic water stopping material.