JP3663003B2 - 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 of the underground continuous wall, for example, a steel plate is provided 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 when the subsequent element is installed. However, he was expecting close contact between the leading and trailing elements.
[0003]
[Problems to be solved by the invention]
Conventional methods cannot follow the hardening shrinkage of concrete, and there are problems that cracks occur in the joints in the vertical direction due to the hardening shrinkage in the horizontal direction, and water leakage occurs due to poor adhesion at the joints. There is a problem that water is leaked because no measures are taken for waterproofing from horizontal cracks caused by curing shrinkage in the direction.
[0004]
Therefore, an object of the present invention is to provide a sealing device that solves the problem of water leakage from the vertical joint portion and the horizontal crack and enables complete water stopping by following long-term curing shrinkage.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is provided between the partition plate fixed to the reinforcing bar of the preceding element of the underground continuous wall via the first steel plate and the tip of the second steel plate fixed to the reinforcing bar of the succeeding element. The cross section is composed of a filling chamber of a liquid sealing material that can expand and contract in both the element direction and the vertical direction.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0007]
FIG. 1 shows a joint portion of the leading element A and the trailing element B from the plane direction.
[0008]
Reference numeral 1 denotes a partition plate made of a steel plate, and a main side plate 2 made of two long steel plates is fixed to a substantially central portion of the partition plate 1 in a vertical direction by welding. The partition plate 1 is attached to the reinforcing bar 5 of the preceding element A by welding via a first steel plate 4 with ribs.
[0009]
3a indicates a support plate made of a steel plate, and an auxiliary side plate 3b made of a pair of thin steel plates is provided on the support plate 3a so as to be inclined inward so as to be in sliding contact with the outer surface of the main side plate 2, The support plate 3a is attached to the reinforcing bar 5 'of the succeeding element B by welding via a ribbed second steel plate 4'.
[0010]
The partition plate 1, the main side plates 2, the support plate 3 a, and the auxiliary side plates 3 b formed a filling chamber 3 of a liquid sealing material C whose cross section can be expanded and contracted in both the elements A, B and vertical directions.
[0011]
Reference numeral 6 denotes an engagement plate for preventing the ready-mixed concrete from flowing into the injection portion of the sealing material in the filling chamber 3 during the construction of the trailing element B, and the engagement plate 6 is made of a square-shaped flexible steel plate. The base portion is attached to the long main side plate 2 by welding, and the tip portion is sandwiched from the outside of the pair of thin steel plate auxiliary side plates 3b of the filling chamber 3 to prevent the inflow of ready-mixed concrete.
[0012]
D indicated by a thick dotted line indicates an oil-based or resin-based concrete edge cutting material. The edge cutting material D is placed on the surface of the engagement plate 6 from the outside of the partition plate 1, that is, from the base side of the trailing element B and the main side plate 2. It is applied to or attached in the form of a sheet to positively prevent the concrete at the joint portion of the succeeding element B from adhering to the partition plate 1, or to reduce the frictional force.
[0013]
The succeeding element B is cured and shrunk from the ready-mixed concrete state with respect to the preceding element A that has already been hardened for construction later, but it adheres to the joint portion with the preceding element A as shown in FIG. If restrained, many cracks will be generated in the horizontal direction, preventing water from stopping.
[0014]
Applying the edge cutting material D produces two effects. First, as shown in FIG. 9, not only the central portion but also the joint portion is not restrained and contracts in the same manner in the vertical direction. Since no cracks occur, water leakage can be prevented. Also, as shown in FIG. 10, the shrinkage cracks can be concentrated in the vicinity of the partition plate 1 by reducing the frictional force even with respect to the horizontal shrinkage.
[0015]
Further, the liquid sealing material filling chamber 3 is formed on the ribbed steel plate 4 ′ having strong adhesion to the concrete so that water entering from the edge cut joint promoted by the edge cut material D does not enter the housing of the succeeding element B. A support plate 3a is attached.
[0016]
In consideration of the case where the partition plate 1 and the concrete are not sufficiently adhered to the preceding element A side, the ribbed steel plate 4 is attached to the partition plate 1 for safety.
[0017]
Next, the construction method according to the embodiment of the present invention will be described with reference to FIGS.
[0018]
First, in FIG. 2, the excavation groove of the preceding element A having a predetermined length is dug in the underground direction. In FIG. 3, a long main side plate 2 forming a filling chamber 3 of a liquid sealing material is welded to a partition plate 1, and this partition plate 1 is interposed in a reinforcing bar cage 5 of a preceding element A with a ribbed steel plate 4. And the assembled rebar cage set is lowered into the excavation groove of the preceding element A.
[0019]
At this time, an engagement plate 6 for preventing the inflow of fresh concrete is attached to the long main side plate 2, and the edge cutting material D is shown by a thick dotted line in FIG. 1 outside the partition plate 1 and the filling chamber 3 for the sealing material. Apply or paste as shown.
[0020]
In FIG. 4, the ready concrete A is completed by placing ready-mixed concrete E between the partition plate 1 and the partition plate 1 before and after the reinforcing bar cage set.
[0021]
Next, as shown in FIG. 5, a digging groove for the succeeding element B is excavated between the preceding element A and the preceding element A.
[0022]
In FIG. 6, the other side of the filling chamber 3 of the liquid sealing material formed in a substantially U shape by a pair of thin auxiliary side plates 3b whose tips are narrowed on the support plate 3a is inserted into the trailing element B through a ribbed steel plate 4 '. The following rebar cage group is welded to the rebar cage 5 'and lowered to the excavation groove of the rear element B. At this time, as shown in FIG. A liquid sealing material C injection portion is provided by combining the other of the row sides.
[0023]
The rebar basket set of the element B is installed so as to have a slight gap 7 between the element A and the partition plate 1.
[0024]
In FIG. 7, ready-mixed concrete E is placed in the excavation groove of the succeeding element B in which the reinforcing bar cage of FIG. 6 is descending. At this time, the ready-mixed concrete E is prevented from flowing in by the engaging plate 6 and the auxiliary side plate 3b, so that an injection portion of the sealing material C is secured.
[0025]
Here, the sealing material C may be injected immediately after the ready-mixed concrete E is cured, or the sealing material C may be injected after a sufficient amount of time has elapsed and the curing shrinkage in the vertical and horizontal directions has settled to some extent.
[0026]
Although this sealing material C is liquid at the time of pouring, it becomes a soft elastic body when it hardens, and follows the concrete that continues to harden and shrink. It has a high sealing effect due to its water expandability, and it does not limit the time of pouring, so it is easy to use. Is excellent.
[0027]
FIG. 11 shows a cross-sectional view of the facing underground continuous wall, and a decorative wall F is applied to the surface and used as it is for the main body. That is, according to the underground continuous wall construction method of the present invention, the joint portion is a liquid sealing material, and horizontal cracking does not occur due to the edge cutting material, so it is possible to achieve complete water stoppage, not just a temporary earth retaining, As a main body with an emphasis on still water, only the decorative wall F can be used.
[0028]
【The invention's effect】
As described above, according to the present invention, the water-swellable liquid sealing material and the concrete edge cutting material make it easy to follow the hardening shrinkage of the concrete that does not cause horizontal cracks, thus achieving complete water stoppage. It can be used not only for temporary earth retaining work but also for the use of the main body that places emphasis on water stopping, and has a high economic effect.
[Brief description of the drawings]
FIG. 1 is a plan view of a joint portion according to an embodiment of the present invention.
FIG. 2 to FIG. 4 are explanatory diagrams of the construction sequence of the preceding element of the present invention.
FIGS. 5 to 7 are explanatory diagrams of a construction order of the succeeding element of the present invention. FIGS.
FIG. 8 is an explanatory diagram of a horizontal crack in a conventional method.
FIG. 9 is an explanatory diagram of curing shrinkage in the vertical direction according to the present invention.
FIG. 10 is an explanatory view of horizontal curing shrinkage of the present invention.
FIG. 11 is a cross-sectional view of opposing underground continuous walls of the present invention.
[Explanation of symbols]
1 Partition plate 2 Main side plate 3 Filling chamber
3a Support plate
3b Auxiliary side plate 4, 4 'Ribbed steel plate 5, 5' Reinforcing bar cage 6 Engagement plate A Preceding element B Subsequent element C Sealing material D Edge cutting material E Ready-mixed concrete F Wall

Claims (6)

The cross section is provided between the partition plate fixed to the reinforcing bar of the preceding element of the continuous underground wall via the first steel plate and the tip of the second steel plate fixed to the reinforcing bar of the succeeding element in both the element direction and the vertical direction. A non-leakable underground continuous wall sealing device characterized by comprising a filling chamber of an extendable liquid sealing material. 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. 2. The sealing device for a continuous leak-free underground wall according to claim 1, wherein a concrete edge cutting material is applied or pasted on an outer surface of the partition plate and an outer surface of the filling chamber. The said steel plate consists of a steel plate with a rib, The sealing apparatus of the leak-free underground continuous wall of Claim 1 characterized by the above-mentioned. The filling chamber has a parallel long main side plate protruding from the outer surface of the partition plate, a long support plate fixed to the tip of the second steel plate, and a protrusion protruding from the support plate to the main side plate. 2. The sealing device for a continuous leak-free underground wall according to claim 1, comprising an auxiliary side plate that is slidably contacted at a tip portion. 6. The seal device for a continuous leak-free underground wall according to claim 5, wherein an engagement plate bent in a letter shape that engages with the outer surface of the auxiliary side plate at the tip is fixed to the outer surface of the main side plate. .

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