JP3782868B2 - Formation method and construction structure of waterproof joint on continuous underground wall - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for forming a waterproof joint for a continuous underground wall formed by forming a trailing element after forming a preceding element, and a construction structure for the waterproof joint.
[0002]
[Prior art]
In a continuous underground wall formed by forming a preceding element adjacent to the preceding element, a partition steel plate is provided at a joint location between the preceding element and the succeeding element to form a joint. There is something. And, in such a partition steel plate joint, a T-shaped or H-shaped steel material is attached to prevent water leakage into the continuous underground wall, but the current leakage preventing effect cannot be sufficiently obtained. It is.
[0003]
[Problems to be solved by the invention]
The present invention focuses on the above-mentioned problems of the prior art and solves this problem. The problem is that in the joint of the continuous underground wall formed by forming the succeeding element after forming the preceding element, An object of the present invention is to provide a method for forming a waterproof joint that can provide an easy and reliable water stop effect, and a construction structure for the waterproof joint.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention provides a method for forming a waterproof joint for a ground wall formed by forming a trailing element after forming a leading element, and is not covered or expanded on the leading element side of the partition plate. A water-expandable member that has been subjected to a delay treatment is disposed, and a water-expandable member that is waterproof-coated is disposed on the downstream element side of the partition plate, and then the partition plate is built in a shaft and casted with concrete. To form a leading element, and then to infiltrate the water-swellable water-expandable member, the waterproof coating was broken or removed, and then concrete was cast to form a trailing element. A method for forming a waterproof joint is provided.
As described above, when installing the partition plate in the shaft, the water-expandable members are attached to both sides of the partition plate on the ground, that is, the preceding element side and the succeeding element side in advance. Can do. And since the water-expandable member on the preceding element side is uncoated or subjected to an expansion delay treatment, when the partition plate is built in the shaft, the expansion starts immediately or slightly later, but on the preceding element side Since concrete is immediately placed, the expansion action of the water-expandable member continues until after the concrete has hardened to a predetermined strength. Therefore, the waterproof element having a sufficient water-stopping property between the preceding element and the partition plate. A joint is formed. On the other hand, although it takes several days for the concrete to be placed on the trailing element side, the water-swellable member on the trailing element side is waterproof-coated, so until this waterproof coating is damaged or removed Since the concrete is cast immediately after being held without being expanded and damaged or removed, a waterproof joint can be formed between the succeeding element and the partition plate as well as the preceding element side.
[0005]
In the method for forming a waterproof joint according to the present invention, the waterproof coating can be damaged or removed by a cleaning device for cleaning a joint portion including the partition plate. That is, the cleaning device is provided with a brush having a sharp tip such as a wire brush. When the trailing element side of the partition plate is cleaned with this brush, the brush tip pierces the waterproof coating and the waterproof coating is damaged. .
[0006]
In the present invention, the construction structure of the waterproof joint of the continuous underground wall formed by forming the trailing element after the formation of the preceding element, a partition plate disposed between the preceding element and the trailing element, A water-expandable member that is disposed on the preceding element side of the partition plate and that has undergone uncovering or expansion delay processing, a water-expandable member that is disposed on the trailing element side of the partition plate, and the trailing element Provided is a waterproof joint construction structure comprising a waterproof coating that covers a water-expandable member on the side so that water does not permeate, and a mesh sheet that covers the water-expandable member from above the waterproof coating.
In this construction structure, the water-swellable member is covered with a waterproof covering, and further covered with a mesh sheet, and fixed to the trailing element side of the partition plate. For example, a brush-like thing with a sharp tip (such as a wire brush) ) Is brought into contact with the water-swellable member on the succeeding element side, the brush penetrates the waterproof coating through the mesh of the mesh sheet, and the waterproof coating is perforated and broken, from which water penetrates. Thereby, water permeates the water-expandable member on the trailing element side and starts to expand. Therefore, in the present invention, the water-expandable member on the trailing element side can start expanding at a predetermined timing.
[0007]
In the present invention, the water-swellable member may be formed from a material that continues the swelling action for about 1 to 10 days after being immersed in water. As such a material, for example, a material containing sodium bentonite and butyl rubber having a high expansion capability, for example, a product manufactured by Nissho Iwai Bentonite Co., Ltd., Volclay Waterstop RX101 can be employed. In addition to the above materials, a sealing material made of water-expandable rubber, such as a product manufactured by Asahi Denka Kogyo Co., Ltd., Adeka Ultra Seal, etc. can be used. The use of water swellable member as described above, continuity water swellable member from the immersion in water, even expansion agent after the concrete was pouring reaches approximately compressive strength 30kgf / cm ² ~100kgf / cm ² In addition, a waterproof joint having a sufficient water-stopping property is formed between the hardened concrete and the partition plate. Examples of the expansion delay treatment method include a water-soluble film, a water-soluble film or a coating film that reacts with an alkali in cement to dissolve.
[0008]
In the present invention, the waterproof coating covering the water-swellable member on the trailing element side of the partition plate can be easily pierced by a sharp tip, for example, a wire brush, a gear or a drill, and can be damaged or removed. It is made of a new material. Examples of such a material include a vinyl sheet, a polyethylene film, and a waterproof coating film.
[0009]
【Example】
Hereinafter, although an example is described based on an accompanying drawing, the present invention is not limited to this. FIG. 1 is a cross-sectional view of a continuous underground wall including a waterproof joint according to the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a cross-sectional view showing a water-swellable member on the trailing element side. is there.
[0010]
In FIG. 1 to FIG. 3, the continuous underground wall 1 includes a plurality of preceding elements 10 and trailing elements 20 that are alternately arranged, and a partition is provided between the leading elements 10 and the trailing elements 20. A partitioning steel plate 11 is disposed as a plate, and a water-expandable stop as a water-expandable member is provided on the preceding element 10 side and the succeeding element 20 side of the partitioning steel plate 11 from the lowest end to the entire length of the uppermost end. Water rubbers 12 and 13 (for example, Volkley Waterstop RX101) are fixed. Here, the water-expandable water-stopping rubbers 12 and 13 are made of a material that is so soft that the wire mesh 17 can easily bite in. The water-expandable water-stopping rubber 13 is a partitioning steel plate that is uncoated with a double-sided tape or the like. 11 is attached to the leading element 10 side, while the water-expandable waterproofing rubber 12 is sealed in advance with a vinyl sheet (not shown) having a thickness of about 0.01 to 0.1 mm as a waterproof covering material. In such a sealed state, as shown in FIG. 3, it is fixed to the trailing element 20 side of the partition steel plate 11 with the tap screw 16 through the wire mesh 17.
Note that a steel material 11a having a T-shaped or H-shaped cross section extends from the lowermost end to the uppermost end of the partitioning steel plate 11, and the steel material 11a has a function as a water stop member. In addition, it is also used as a travel guide for a cleaner to be described later.
[0011]
Next, the formation method of the waterproof joint in a continuous underground wall is demonstrated.
When the continuous underground wall 1 is constructed, the water-expandable water-stopping rubbers 12 and 13 are fixed in advance over the entire length from the lowermost end to the uppermost end of both sides of the partitioning steel plate 11 on the ground as described above. Attach to ridge 14. And the reinforcing bar 14 and the partition steel plate 11 assembled in this way are built in the vertical shaft for construction of the preceding element excavated in the ground 30. At this time, although the shaft is filled with muddy water, the water-expandable water-stopping rubber 12 on the trailing element side does not expand because it is sealed in advance with a vinyl sheet, while the water-expandable property on the preceding element side does not expand. Since the water-stopping rubber 13 is uncoated or subjected to an expansion delay treatment, the water-expandable water-stopping rubber 13 in contact with the muddy water has a sufficient expansion ability even after the concrete is cured.
[0012]
Next, concrete is immediately placed in the shaft for the leading element 10 to construct the leading element 10. Here, the compressive strength of the concrete capable of resisting the pressure of the water-swelling water-stopping rubber that continues to expand is about 10 to 100 kgf / cm ² , and the placed concrete reaches the compressive strength after about 1 to 3 days. On the other hand, when Volclay Waterstop RX101 is used as the water-expandable waterstop rubber, the expansion coefficient (weight increase rate) of the water-expandable waterstop rubber 13 after 3 days is about 80 to 100%, Further, it can absorb water and expand to 200% or more. Accordingly, the water-expandable water-stopping rubber 13 is maintained in a state where it is pressed against both the hardened concrete and the partitioning steel plate 11 by the expansion pressure, and a waterproof joint having a sufficient water-stopping property is formed between them. Is done.
[0013]
After constructing a plurality of preceding elements 10 and 10 separated by a predetermined length, the ground between the preceding elements 10 and 10 is excavated to form a shaft for a succeeding element. Next, the slime adhering to the succeeding element side of the partition steel plate 11 in this shaft is cleaned by a cleaning device (not shown), and concrete is placed in the shaft for the succeeding element.
[0014]
Here, the cleaning device is configured to travel using the steel material 11a as a guide rail and rub the surface of the partition steel plate 11 with a wire brush or the like. When the trailing element side of the partition steel plate 11 is cleaned by such a cleaning device, the tip of a wire brush or the like passes through the mesh of the wire mesh 17 and pierces the vinyl sheet that covers the water-expandable water-stopping rubber 12. fall into disrepair. Thereby, muddy water permeates and the water-expandable water-stopping rubber 12 starts to expand. At this time, although the wire mesh 17 is wound around the outer periphery of the water-expandable water-stopping rubber 12, the water-expandable water-stopping rubber 12 itself is very soft, so that the wire-mesh 17 continues to expand in a state of being bitten. Similarly to the water-expandable water-stopping rubber 13, the expansion pressure is pressed against both the hardened concrete and the partition steel plate 11 to form a waterproof joint.
[0015]
【The invention's effect】
In the present invention, since the water-swellable members are attached to both sides of the partition plate in advance, the partition plate is built into the shaft, so that the installation for this installation is easy, and the partition plate is built into the shaft. Since the concrete is immediately placed on the preceding element side, the water-expandable member continues the expansion action until the concrete has hardened to a predetermined strength, so that there is sufficient space between the preceding element and the partition plate. A waterproof joint having a sufficient water-stopping property is formed. On the other hand, the water-swellable member on the trailing element side is covered with a waterproof coating, and if this waterproof coating is damaged or removed, the concrete is cast immediately. A waterproof joint having good water blocking properties can be formed between the plates.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a continuous underground wall including a waterproof joint according to the present invention.
FIG. 2 is a partially enlarged view of FIG.
FIG. 3 is a cross-sectional view showing a water-swellable member on the trailing element side.
[Explanation of symbols]
1 Continuous underground wall 10 Leading element 11 Partition steel plate (partition plate)
12 Water-expandable water stop rubber (water-expandable member on the leading element side)
13 Water-expandable water stop rubber (water-expandable member on the trailing element side)
17 Wire mesh (mesh sheet)
20 back element

Claims (3)

A method of forming a waterproof joint of a underground wall formed by forming a trailing element after forming a preceding element,
A water-swellable member that is uncoated or subjected to expansion delay treatment is disposed on the preceding element side of the partition plate, and a water-swellable member that is waterproof-coated is disposed on the succeeding element side of the partition plate. A partition plate is built in the shaft, concrete is cast to form a leading element, and then the waterproof coating is damaged or removed in order to allow water to penetrate into the waterproof coated water-expandable member. A waterproof joint forming method characterized in that a trailing element is formed by placing The method for forming a waterproof joint according to claim 1, wherein the waterproof coating is damaged or removed by a cleaning means for a joint portion including the partition plate. The construction structure of the waterproof joint of the continuous underground wall formed by forming the trailing element after the formation of the preceding element,
A partition plate disposed between the preceding element and the succeeding element; a water-expandable member that is disposed on the preceding element side of the partition plate and that has been subjected to an expansion delay treatment; and A water-swellable member disposed on the row element side, a waterproof coating that covers the water-swellable member on the succeeding element side so that water does not penetrate, and the water-swellable member is covered from above the waterproof coating. Construction structure of waterproof joint with mesh sheet.

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