JP3715039B2 - Leak-free underground continuous wall sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device for preventing leakage of underground continuous walls such as use of a temporary earth retaining body at the time of newly installing an underground station, an underground shopping area, and the like, and a temporary earth retaining wall for deep excavation.
[0002]
[Prior art]
As a conventional method for preventing water leakage at the joint part of the continuous underground wall, for example, a steel plate is protruded at a right angle near the center or outside of the partition plate and water is stopped by the steel plate, or the preceding element is cut during construction of the succeeding element. However, he was expecting close contact between the leading and trailing elements.
[0003]
[Problems to be solved by the invention]
The conventional method cannot follow the hardening shrinkage of the concrete, and there is a problem that a crack occurs in the joint part of the preceding and succeeding elements due to the hardening shrinkage, or water leakage occurs due to poor adhesion of the joint. When concrete adheres to the joint and is constrained, there is a problem in that it also cracks in the horizontal direction and causes water leakage.
[0004]
Therefore, the present invention eliminates the problem of water leakage by suppressing the occurrence of horizontal cracks except for water leakage from the joint part and the restraint from the joint part, and seals that enable complete water stop following long-term curing shrinkage. An object is to provide an apparatus.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a cross section between the outer surface of the partition plate fixed to the reinforcing bar of the preceding element of the underground continuous wall and one surface of the H-shaped steel flange fixed to the succeeding element. A filling chamber of a liquid sealing material that can be expanded and contracted in the element direction is provided.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0007]
FIG. 1 shows a perspective view of the joint portion of the preceding element A and the succeeding element B with the ground removed.
[0008]
Reference numeral 1 denotes a partition plate made of a steel plate, and the partition plate 1 is attached to the reinforcing bar 2 of the preceding element A by welding.
[0009]
Reference numeral 3a denotes an H-shaped steel. Four vertical ridges 4a, 4a, 4b and 4b made of square steel were welded in parallel to one surface of the flange of the H-shaped steel 3 as shown in FIG.
[0010]
Here, the inner two ridges 4b and 4b are formed slightly shorter than the outer ridges 4a and 4a at the lowermost end.
[0011]
1c shows the lower protrusion fixed between the lower ends of the said outer protrusion 4a, 4a.
[0012]
Reference numeral 6 denotes a temporary fixing means for the H-shaped steel 3. The temporary fixing means 6 is welded to an outer surface of the partition plate 1 and a ring-shaped holding plate 6a temporarily attached to an appropriate position outside the outer protrusion 4a. A bolt 6b, a ring-like elastic body 6c that contacts the outer surface of the holding plate 6a, a washer 6d that contacts the outer surface of the elastic body 6c, and a nut 6e that is screwed into the bolt 6b.
[0013]
Next, the construction method according to the embodiment of the present invention will be described.
[0014]
The H-section steel 3 formed by welding the protrusions 4a, 4a, 4b and 4b as shown in FIG. 2 is bolted to the outer surface of the partition plate 1 via the elastic body 6c of the temporary fixing means 6 and the washer 6d as shown in FIG. A nut 6e is screwed to 6b to be temporarily fixed.
[0015]
By this temporary fixing, a filling chamber 5 for the left and right sealing material C is formed by the groove between the left and right outer protrusions 4a and 4b and the partition plate 3, and the left and right inner protrusions 4b and 4b and the partition plate 3 are formed. Thus, the auxiliary filling chamber 7 of the water shielding material D is formed, and the left and right filling chambers 5 are communicated with each other by the communicating portion 5c by the lower ridges 1c at the lower ends of the inner ridges 4b and 4b.
[0016]
After preparing the location of the sealing device in this way, first, the excavation grooves of the preceding element A having a predetermined length are sequentially dug underground, and the partition plate 1 holding the H-shaped steel 3 is used as the reinforcing bar 2 of the preceding element A. Welding and lowering the assembled rebar cage set into the excavation groove of the preceding element A.
[0017]
Then, the ready concrete A is completed by placing ready-mixed concrete between the partition 1 and the partition plate 1 before and after the rebar cage set.
[0018]
Next, the ground between the preceding element A and the preceding element A is excavated in the excavation groove for the succeeding element B.
[0019]
Reinforcing bar 2 'of descending element B is lowered into this succeeding excavation groove and ready-mixed concrete is placed.
[0020]
When the ready-mixed concrete hardens, the H-shaped steel 3 held on the partition plate 1 is fixed to the trailing element B and integrated with the trailing element B.
[0021]
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.
[0022]
In addition, a water shielding material D such as urethane rubber is inserted in the auxiliary filling chamber 7 in advance.
[0023]
When the ready-mixed concrete is hardened, the sealing material C is injected as shown in FIG.
[0024]
At the time of injection, injection is performed from one injection port 5a of the filling chamber 5 and pressure-injected downward as indicated by an arrow as shown in FIG. 4, and from the communicating portion 5c upward, the seal material C is applied to the other injection port 5b. Will rise. By filling by this U-turn method, the filling chamber 5 is surely filled.
[0025]
The succeeding element B cures and shrinks from the ready-mixed concrete state with respect to the preceding element A that has already been cured for later construction. However, due to the shrinkage in the vertical direction, as shown in FIG. When attached and restrained, many cracks are generated in the horizontal direction and the water cannot be stopped. However, as shown in Fig. 6, the horizontal shrinkage of concrete can be smoothly contracted without adhering to the joint. As a result, the vertical crack generated in the vicinity of the joint portion does not occur, and the generation of the horizontal crack generated by being restrained by the joint portion is eliminated, and the leakage of water due to the vertical and horizontal cracks is eliminated.
[0026]
However, even if cracking does not occur by facilitating shrinkage without adhering, joints, that is, gaps, are formed due to shrinkage in the joint portion, resulting in water leakage.
[0027]
In the embodiment of the present invention, the contact surface between the partition plate 1 of the joint portion and the succeeding element B does not adhere, and a joint is formed by contraction. Therefore, leakage from the joint is caused by the U of the sealing material C for water expansion. A water-tight seal is realized by reliably shutting off with a turn-type injection.
[0028]
This sealing material C is a liquid at the time of pouring, but when it hardens, it becomes a soft elastic body and follows the concrete that continues to shrink by hardening, and maintains a high sealing effect due to its water expandability.
[0029]
FIG. 7 shows a cross-sectional view of the facing underground continuous wall, where a decorative wall E is applied to the surface and the main body is used as it is. That is, according to the underground continuous wall construction method of the present invention, since it does not adhere to or restrain the joint part, vertical and horizontal cracks due to shrinkage do not occur, and the joint part can realize complete water stop with a liquid sealing material, Not only temporary earth retaining works but also the decorative wall E can be used as a main body that places importance on water stopping.
[0030]
【The invention's effect】
As described above, according to the present invention, it is easy to follow the hardening shrinkage of concrete due to the joint structure with a simple structure excluding the water-swellable liquid sealing material and restraint, and vertical and horizontal cracks are generated. Therefore, it is possible to realize complete water stoppage, and it is possible to sufficiently cope with the use of a main body that places importance on water stoppage, as well as temporary earth retaining work, and has a highly economical effect.
[Brief description of the drawings]
FIG. 1 is a perspective view of a joint portion according to an embodiment of the present invention with the ground removed.
FIG. 2 is a perspective view of the H-section steel of the main part.
FIG. 3 is a cross-sectional view of a filling chamber of the liquid sealing material.
FIG. 4 is a longitudinal sectional view of a filling chamber of the liquid sealing material.
FIG. 5 is an explanatory diagram of a horizontal crack in a conventional method.
FIG. 6 is an explanatory diagram of curing shrinkage in the horizontal direction according to the present invention.
FIG. 7 is a cross-sectional view of opposing underground continuous walls of the present invention.
[Explanation of symbols]
1 Partition plate 2, 2 'Reinforcing bar 3 H-section steel 4 Projection 5 Filling chamber
5c Communication part 6 Temporary fixing means A Leading element B Trailing element C Sealing material D Water shielding material

Claims (4)

A liquid sealing material whose cross section can be expanded and contracted in both element directions between the outer surface of the partition plate fixed to the reinforcing steel cage of the preceding element of the continuous underground wall and one surface of the H-shaped steel flange fixed to the succeeding element. A sealing device for a continuous leak-free underground wall characterized by providing a filling chamber. The said liquid sealing material consists of a liquid water-expandable sealing material, The sealing apparatus of the leak-free underground continuous wall of Claim 1 characterized by the above-mentioned. Four protrusions 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 an auxiliary filling chamber of a water shielding material is formed by the central groove and the outer surface of the partition plate. The left and right filling chambers are formed in the left and right groove portions 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 portion. Non-leakable underground continuous wall sealing device. 2. The sealing device for a continuous leak-free underground wall according to claim 1, wherein the flange of the H-shaped steel is temporarily fixed to an outer surface of the partition plate via an elastic material.

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