JPH0860683A - Construction method of underground buried part of concrete structure and form thereof - Google Patents

Abstract

PURPOSE: To shorten a construction period by installing a form, which has an adherence conformable to concrete, such as a slate board, to both surface of a waterproofing sheet so that it may be interposed between a ground surface and a foundation so as to execute construction work. CONSTITUTION: Cement-made slate boards 2, whose crosswise dimensions are different from each other, are bonded respectively on both surfaces of a waterproofing sheet 1 made of middle soft synthetic resin, thereby forming a water- proofing form A having an offset 3 in the form of a fine strip. In case when constructing a basement side wall, the waterproofing forms A are stacked on a concrete foundation placed on an underground bottom while the waterproofing forms A are being arranged to butt each other. At the same time, concrete panels are erected on the forms A with a spacing. A joint material 1a and a slate band 2a are installed to a joint groove A formed by the offset 3 and then ready-mixed concrete are poured between the forms A and the concrete panels while a soil is back-filled on the outer surface of the forms A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a concrete structure, particularly a portion buried in the soil, and a formwork therefor.

[0002]

2. Description of the Related Art Conventionally, the ground surface has been dug deeply, and two forms, inside and outside, have been erected upright on a concrete foundation placed at the bottom with a wall thickness interval, and fresh concrete is poured and filled between the forms. There is known a method of constructing a buried part of a concrete structure under the ground, for example, a side wall of a basement.

[0003]

In order to prevent the penetration of water from the backfill soil into the room, the side wall of the basement is generally constructed by bonding a waterproof sheet to the outer surface of the side wall before backfilling. However, it has the following problems. (A) Since the waterproof sheet cannot be adhered if the side wall is not dried, the mold is released, and the side wall is exposed and left to dry for a long period (about 15 days). Although the method of bonding is used, the problem is that the period for leaving it for drying is too long and backfilling cannot be done during that time, so the scaffolding on the backfilling surface cannot be assembled, which inevitably leads to a long construction period and construction. The cost will be increased. (B) Since the waterproof sheet is exposed on the outer surface of the side wall, when the backfill soil is pressed against the sheet surface with a heavy machine or the like, there is a concern that the shovel portion of the heavy machine may catch the waterproof sheet and tear the sheet. (C) Since the waterproof sheet is also pulled downward by the natural settling of the backfilled soil pressed against the waterproof sheet surface, the sheet may peel off from the side wall, resulting in incomplete waterproofness of the side wall. Therefore, the present invention, in view of the above-mentioned conventional problems, shortens the construction period by using a special formwork, prevents tearing of the waterproof sheet by a heavy machine at the time of backfilling, and from the side wall of the waterproofing sheet by natural sedimentation of backfill soil. The purpose is to eliminate the peeling prevention.

[0004]

SUMMARY OF THE INVENTION To achieve the above object, the present invention digs down the surface of the earth, and makes two inner and outer molds stand upright with a wall thickness interval on a concrete foundation placed at the bottom. , In the method of pouring and filling fresh concrete between both molds and constructing the underground buried part of the concrete structure under the ground, at least the outer mold located between the ground and the foundation is placed in the middle. A waterproof sheet, and, on both sides thereof, is constituted by a waterproof mold in which a protective plate of the above-mentioned sheet having good adhesion compatibility with concrete is polymerized and integrated, and one side of this waterproof mold is injected into the ready-mixed concrete, And, the other side is buried in the backfill soil, respectively, the method of constructing the buried part of the concrete structure, and the waterproof sheet in the middle, and the adhesive familiarity with concrete on both sides. Good that the protective plate of the seat polymerized integrated with it is an gist formwork to be used for ground burial portion of the concrete structure comprising as it said.

[0005]

FIG. 1 shows a front view of a waterproof form A used for carrying out the method of the present invention. This waterproof form A has a rectangular shape conforming to building standards, for example, 3 × 6. None, and in the middle, it is composed of a medium soft synthetic resin waterproof sheet 1, and a cement-based slate plate 2 (corresponding to a sheet protection plate in the claims) polymerized and adhered to both surfaces thereof.

Among the above-mentioned slate plates 2 on both sides,
The vertical and horizontal dimensions of the slate plate 2 on one side are set to be shorter than those of the slate plate on the other side by a predetermined amount, and a narrow step 3 is provided around which the waterproof sheet 1 is exposed due to the dimensional difference between the slate plates 2. To be

In this example, the waterproof sheet 1 is
An example is shown in which the thickness is 3.2 mm and the slate plate 2 has a thickness of about 4 to 6 mm.

[0008]

By using the waterproof form A having the above-mentioned structure, a method of constructing a buried part of a building, for example, a side wall of a basement will be described as an example. As shown in FIG. L is dug down to a required depth, and the waterproof form A described in the embodiment and the normally used control panel 5 are erected on the concrete foundation 4 placed on the bottom thereof with a required wall thickness interval S therebetween.

As shown in FIG. 4, the waterproof form A is piled up in a required number corresponding to the depth of the basement while abutting the sides thereof. In this stacked state, the short pipe 6 is applied to the outer surface side of the waterproof form A in a conventional manner, and the short pipe 6 and the sheet pile 7 having a mountain-reserving action are connected via a support 8 for waterproofing. Hold the form A so that it does not fall to the mountain side.
In addition, the inner surface side of the waterproof form A is held so as not to fall inward through a support 9 which is laid across the control panel 5 as in the conventional method.

Since the waterproof mold A is provided with the step 3, a narrow joint groove A1 is naturally formed between the waterproof molds A abutted by the stacking as shown in FIG. A narrow strip-shaped joint material 1a made of the same material or the same material as the waterproof sheet 1 is adhered to the joint groove A1 to seal the abutting portion A2 of the waterproof form A, and a narrow strip is formed on the joint material 1a. The slate band 2a is adhered to cover and protect the joint material 1a so that the joint material 1a is not cracked by the injected concrete.

In the state of joint treatment as shown in FIG. 5, fresh concrete is poured between the control panel 5 and the waterproof form A by a conventional method for forming a side wall, and the fresh concrete after 1 to 2 days is poured. Backfilling is carried out in the usual manner on the outer surface of the waterproof form A when the settling has settled and the fresh concrete has not yet dried. This means that scaffolding for the next step work can be assembled on the backfilled soil without waiting for it to dry.

In the backfilling, it is free to remove the short pipe 6, the sheet pile 7, and the support 8 or to embed them as they are. In addition, it goes without saying that backfilling uses a heavy machine or the like.

In the above embodiment, the construction of the side wall of the basement of the building has been described as an example, but it is needless to say that it can be widely applied to the construction method of the underground buried portion of various concrete structures such as tunnels and common grooves. Is.

[0014]

As described above, according to the present invention, the following effects can be obtained. (A) Waiting for the soil to be buried in the soil as it is to be dried, and instead of waterproofing it, it is treated with the waterproof formwork itself that has been previously waterproofed. It can be backfilled promptly after being left for 1 to 2 days until it stabilizes, and thus the construction period can be greatly shortened and the construction cost can be reduced. (B) Since the waterproof mold is protected by the protective plate that is polymer-bonded to the waterproof sheet, it is possible to eliminate the fear that the waterproof sheet will be torn by the shovel portion of the heavy machine at the time of backfilling. (C) Since the backfill soil is pressed against the protective plate surface without contacting the waterproof sheet, the waterproof sheet is pulled downward due to the natural settling of the backfill soil and is buried in the soil without peeling. It is possible to maintain the waterproofness of the part completely and continuously.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a waterproof mold.

FIG. 2 is an enlarged side view of a part of the same.

FIG. 3 is a construction drawing of a portion of a cement structure buried in the soil using a waterproof form.

FIG. 4 is a front view showing a state where the waterproof molds are piled up.

FIG. 5 is a cross-sectional view of a joint processing portion of the stacked waterproof molds.

[Explanation of symbols]

 A Outer formwork (waterproof formwork of the present invention) 1 Waterproof sheet 2 Protective plate 4 Concrete foundation 5 Inner formwork (control panel)

Claims (2)

[Claims] 1. The ground surface is dug down, two inner and outer molds are made to stand upright on a concrete foundation placed at the bottom with a wall thickness interval, and fresh concrete is injected and filled between the two molds, In the method of constructing a buried portion of a concrete structure below, at least an outer formwork located between the ground surface and the foundation, a waterproof sheet in the middle, and
The protective plate of the above-mentioned sheet, which has good compatibility with concrete, is constructed on both sides by a waterproof formwork, and one side of this waterproof formwork is filled with the above-mentioned ready-mixed concrete and the other side is embedded. A method for constructing a portion of a concrete structure to be buried in the soil, which is characterized by burying in each of the returned soil. 2. A waterproof sheet is used in the middle, and protective sheets of the above-mentioned sheet, which has good adhesive compatibility with concrete on both sides, are polymerized and integrated, and are used in a buried portion of a concrete structure. Formwork.