JPH1046571A - Sealing device for water-leakless underground continuous wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water leakage from a coupler part by providing a filling chamber of a liquid sealant a section of which is free to extend and contract in both element directions between an outside surface of a partition plate fixed on a reinforced cage of a preceding element and one surface of a flange of an H steel fixed on a descending element. SOLUTION: Ready-mixed concrete is deposited by lowering a reinforced cage 2' of a descending element B in a descending drilled groove after constructing a preceding element A. Thereafter, after the ready-mixed concrete is hardened, a sealant C is injected from one inlet hole 5a of a filling chamber 5, and the sealant C rises upward from a communicating part 5c to the other inlet hole 5b and filled in the inside of the filling chamber 5. Thereafter, concrete of the element B is hardened and contracted, but it is made to be smoothly contracted without adhering on the coupler part against hardening and contraction of concrete in the horizontal direction, and accordingly, a crack in the vertical direction produced in the neighbourhood of the coupler part is not produced, production of a horizontal crack produced by being constrained by the coupler part is eliminated, and water leakage by the vertical and horizontal cracks is both eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for use of a temporary soil retaining body at the time of new construction of an underground station, an underground shopping mall, and the like, and for preventing water leakage from an underground continuous wall such as a temporary soil retaining work for deep excavation.

[0002]

2. Description of the Related Art As a conventional method for preventing water leakage from a joint part of an underground continuous wall, for example, a steel plate is projected at a right angle near the center or outside of a partition plate to stop water by the steel plate, or to construct a subsequent element. Sometimes the leading element is cut,
He was expecting close contact between the following elements.

[0003]

However, the conventional method cannot follow the hardening shrinkage of concrete, and the leading method
Cracks occur at the joints of the succeeding elements, and water leaks due to poor adhesion at the joints.Furthermore, when concrete adheres to the joints and is constrained, cracks also occur in the horizontal direction. There was a problem of causing water leakage.

Therefore, the present invention eliminates the above-mentioned water leakage from the joint and restraint from the joint, suppresses the occurrence of horizontal cracks, eliminates the problem of water leakage, and enables complete water stoppage following long-term curing shrinkage. It is an object of the present invention to provide a sealing device.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides one of an outer surface of a partition plate fixed to a reinforcing bar of a preceding element of an underground continuous wall and a flange of H-section steel fixed to a succeeding element. A filling chamber of a liquid sealing material whose cross section can expand and contract in both element directions is provided between the surface and the surface.

[0006]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of the joint portion between the leading element A and the trailing element B with the ground cut away.

Reference numeral 1 denotes a partition plate made of a steel plate, and the partition plate 1 is attached to a reinforcing bar 2 of the preceding element A by welding.

Reference numeral 3a denotes an H-shaped steel, and four vertical ridges 4a made of square steel are provided on one surface of a flange of the H-shaped steel 3.
4a, 4b and 4b were welded in parallel as shown in FIG.

Here, at the lowermost end, the two inner protrusions 4b, 4b are formed slightly shorter than the outer protrusions 4a, 4a.

Reference numeral 1c denotes a lower ridge fixed between the lower ends of the outer ridges 4a, 4a.

Reference numeral 6 denotes a temporary fixing means for the H-shaped steel 3. The temporary fixing means 6 includes a ring-shaped holding plate 6 a temporarily attached to an appropriate position outside the outer ridge 4 a, and a temporary fixing means for the partition plate 1. A bolt 6b welded to the outer surface, a ring-shaped elastic body 6c abutting on the outer surface of the holding plate 6a, a washer 6d abutting on the outer surface of the elastic body 6c, and a nut 6e screwed to the bolt 6b
Consists of

Next, a construction method according to an embodiment of the present invention will be described.

An H-shaped steel 3 formed by welding the ridges 4a, 4a, 4b and 4b as shown in FIG. 2 is provided with an elastic body 6c of a temporary fixing means 6 and a washer 6d on the outer surface of the partition plate 1 as shown in FIG. The nut 6e is temporarily fixed by screwing the nut 6e to the bolt 6b.

By this temporary fixing, the left and right outer ridges 4a,
Filling chambers 5 for the left and right seal materials C are formed by the grooves between the grooves 4b and the partition plate 3, and the left and right inner ridges 4b, 4
b and the partition plate 3 form an auxiliary filling chamber 7 for the water-impervious material D, and further include lower protrusions 1 at the lower ends of the inner protrusions 4b, 4b.
c, the left and right filling chambers 5 are communicated with each other through the communication portion 5c.

After the location of the sealing device is prepared as described above, the excavation groove of the preceding element A having a predetermined length is firstly dug in the underground direction, and the partition plate 1 holding the H-section steel 3 is reinforced by the reinforcing bar of the preceding element A. It is welded to the cage 2 and the assembled reinforcing bar cage set is lowered into the excavation groove of the preceding element A.

[0017] Then, the partition 1 before and after the reinforcing bar cage set 1
Then, the ready-mixed concrete is poured between the partitioning plate 1 and the partition 1 to complete the construction of the preceding element A.

Next, the preceding element A and the preceding element A
Is excavated in the excavation groove for the following element B.

The rebar cage 2 'of the trailing element B is lowered into the trailing excavation trench, and fresh concrete is poured.

When the ready-mixed concrete hardens, the partition plate 1
Is fixed to the following element B and integrated with the following element B.

In this integration, the H-section steel 3 is attached to the partition plate 1 via the elastic body 6c, so that it can move in both element directions.

A water-blocking material D such as urethane rubber is inserted in the auxiliary filling chamber 7 in advance.

When the ready-mixed concrete has hardened, a sealing material C is injected as shown in FIG.

At the time of injection, injection is performed from one injection port 5a of the filling chamber 5 and pressure injection is performed downward as shown by an arrow as shown in FIG. 4, and the other injection port 5b is directed upward from the communication portion 5c.
Then, the sealing material C rises. The filling in the filling chamber 5 is ensured by the injection using the U-turn method.

This succeeding element B hardens and shrinks from the ready-mixed state to the already hardened preceding element A to be applied later. However, the shrinkage in the vertical direction causes the former element A and the preceding element A to shrink as shown in FIG. If it adheres to the joint and is constrained, many cracks occur in the horizontal direction and water cannot be stopped. However, as shown in FIG. If the joint can be contracted, no vertical cracks are generated near the joint, and no horizontal cracks are generated by being restrained by the joint, and water leakage due to the vertical and horizontal cracks is eliminated.

However, even if cracks are not generated by facilitating shrinkage without adhering, joints, ie, gaps, are formed in the joint portion due to shrinkage and water is leaked.

In the embodiment of the present invention, since the contact surface between the partition plate 1 of the joint portion and the following element B does not adhere to each other and shrinks to form a joint, water leaking from the joint is reduced by a water-swelling sealing material. An anhydrous seal was realized by reliably shutting off with the U-turn type injection of C.

This sealing material C is liquid at the time of injection,
When hardened, it becomes a soft elastic body and follows concrete that hardens and shrinks, and maintains a high sealing effect due to its water expandability.

FIG. 7 is a cross-sectional view of the facing underground continuous wall, in which a decorative wall E is provided on the surface and the main body is used as it is. In other words, according to the underground continuous wall construction method of the present invention, the joint does not adhere and is not restrained, so that vertical and horizontal cracks do not occur due to shrinkage. Not only temporary earth retaining works, but also the decorative wall E alone can be adequately used as a main body that emphasizes water stoppage.

[0030]

As described above, according to the present invention, a water-swellable liquid sealing material and a joint having a simple structure excluding restraint are provided.
It is easy to follow the persistent hardening shrinkage of concrete and does not generate vertical or horizontal cracks, so it is possible to realize perfect water stoppage, not only for temporary earth retaining work but also for use of the main body that emphasizes water stoppage It can respond sufficiently and has a highly economical effect.

[Brief description of the drawings]

FIG. 1 is a perspective view of a joint part according to an embodiment of the present invention, in which a ground is cut off.

FIG. 2 is a perspective view of an H-beam of the main part.

FIG. 3 is a transverse sectional view of a filling chamber of the liquid sealing material.

FIG. 4 is a vertical sectional view of a filling chamber for the liquid sealing material.

FIG. 5 is an explanatory view of a horizontal crack in a conventional method.

FIG. 6 is an explanatory view of curing shrinkage in the horizontal direction of the present invention.

FIG. 7 is a cross-sectional view of the opposed underground continuous wall of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 partition plate 2, 2 ′ rebar cage 3 H-section steel 4 ridge 5 filling chamber 5 c communicating part 6 temporary fixing means A preceding element B trailing element C sealing material D waterproof material

Claims (4)

[Claims] 1. The cross section can be expanded and contracted in both element directions between an outer surface of a partition plate fixed to a reinforcing cage of a leading element of an underground continuous wall and one surface of an H-shaped steel flange fixed to a succeeding element. A sealing device for a continuous wall with no leaking water, characterized by providing a filling chamber for a liquid sealing material. 2. The sealing device according to claim 1, wherein the liquid sealing material is a liquid water-swellable sealing material. 3. Four flanges extending in the vertical direction are provided in parallel on one surface of the flange of the H-shaped steel to form three grooves, and a water shielding material is formed by a central groove and an outer surface of the partition plate. And the left and right grooves are formed in the left and right grooves and the outer surface of the partition plate, and the left and right filling chambers communicate with each other at the lowermost end of the groove. Item 2. A sealing device for a continuous wall with no water leakage according to Item 1. 4. The sealing device for a continuous wall with no water leakage according to claim 1, wherein the flange of the H-section steel is temporarily fixed to an outer surface of the partition plate via an elastic material.