JP2973815B2 - Construction method of pressure-resistant wall under the building - Google Patents

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 pressure-resistant wall at an outer peripheral portion of a basement of a building.

[0002]

2. Description of the Related Art To construct a building underground outer peripheral pressure-resistant wall, first, a temporary gutter wall that resists side pressure such as earth pressure or water pressure is installed outside the planned building's underground outer peripheral pressure-resistant wall, and then installed inside. After constructing the formwork, constructing the beam and floor on the outer wall and the upper floor with cast-in-place reinforced concrete, disassembling the formwork, relocating the inside of the outer wall a little distance again, and between the beam below the upper floor and the floor It is common to build an inner wall by stacking concrete blocks to form a double wall structure. The double wall structure is used in order to cope with groundwater intrusion by collecting groundwater entering from the outer wall at the lower part of the intermediate cavity and guiding the water under the floor to drain. (See Fig. 3)

[0003]

The construction of the inner wall after the construction of the outer wall to form a double wall structure is a work that requires a great deal of labor and time, although it is a countermeasure against infiltration of groundwater. Including surface finishing requires even more effort and time. Furthermore, as the thickness of the double wall increases, the area of the basement decreases accordingly.

[0004] For this reason, at present, there is a demand for a method of constructing an underground outer peripheral pressure-resistant wall having a reasonable double-wall structure.

[0005]

According to the present invention, in response to such a demand, the inner wall is not constructed again to have a double wall structure, but the outer wall and the inner wall are simultaneously constructed when the outer wall is constructed. An object of the present invention is to provide a construction method for constructing a wall and to rationalize construction of a pressure-resistant wall around the underground.

That is, the present invention provides (A) a step of arranging reinforcing bars inside an existing retaining wall, and (B) a plurality of reinforcing ribs extending in a longitudinal direction, and a weir on the reinforcing ribs. Installing a precast reinforced concrete formwork to which the plate is attached inside the reinforcing bar, and fixing the precast reinforced concrete formwork to a steel frame, which is the core material of the retaining wall, with bolts;
(C) A step of placing concrete between the retaining wall and the weir plate, and a method for constructing a pressure-resistant outer wall of the building underground.

The main point of the present invention is that a precast reinforced concrete product to which a weir plate is attached is used as an inner formwork to construct an outer wall with a cast-in-place reinforced concrete. It is a frame, which has a function as an inner wall.

For this reason, the precast reinforced concrete formwork used in the present invention must have a shape and a structure according to the purpose.

The precast reinforced concrete formwork used in the present invention will be described.

[0010] The main body of the precast reinforced concrete formwork is a long plate-like body and has a plurality of reinforcing ribs. Although the number of reinforcing ribs is usually sufficient for two, it is increased accordingly as the width of the precast reinforced concrete form becomes wider. An appropriate number of inserts for mounting a dam plate are buried in the surface of the reinforcing ribs, and an appropriate number of bolt through holes for mounting a form that penetrate the reinforcing ribs in the thickness direction are formed.

By making the length of the form body the same as the height of the basement wall at the time of installation, it can be installed without horizontal seams, but the width of the form body is limited. Yes, a vertical seam is inevitably generated during installation. For this reason, the seam in the width direction of the form body needs to have a normal various joint structure, and it is necessary to fill the joint with a water-stopping material to stop water. It is preferable that a plate-shaped water-stopping material is attached to the mold body in advance by bonding or the like because manufacture and construction of the formwork body are simple. A formwork in which a weir plate is attached to the entire surface of the formwork body on the reinforcing rib side by bolting or the like is installed at a predetermined position. Therefore, when the mold is installed, a vertically connected cavity surrounded by the plate-like surface of the concrete, the reinforcing ribs, and the dam plate is formed in the mold. Groundwater that has penetrated from cracks in the outer wall, etc., collects in the lower part of this cavity and is guided under the floor and drained.

As the weir plate and the water-stopping material, ordinary ones are used. As the weir plate, plywood, plastic plate, steel plate and the like are used, and as the water-stopping material, a plate having rubber elasticity is used. .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a precast reinforced concrete formwork used in the present invention, wherein (a) is an elevational view with the formwork installed, and (b) is a state with the formwork installed. FIG.

The main body of the precast reinforced concrete form is a plate-like long body, and two reinforcing ribs 3 are provided along the longitudinal direction of the plate-like body 7. An appropriate number of inserts 4 for mounting the plate are buried, and an appropriate number of bolt through holes 5 penetrating the reinforcing ribs 3 are formed. The shape around the left and right reinforcing ribs 3 is a shape that is inverted inside and outside, and is a shape that can be connected to the main body of the adjacent formwork. Then, a plate-like water-stop material 15 is adhered to one of the overlapping surfaces of the joints. The damper plate 2 is attached to the reinforcing ribs 3 of the formwork body by bolting to form the formwork 1, and a cavity 6 is formed between the damper plate 2 and the plate-like body 7.

FIGS. 2A and 2B show a building underground outer peripheral pressure-resistant wall constructed according to the present invention. FIG. 2A is a longitudinal sectional view, and FIG. 2B is a view taken along the line AA in FIG.

Referring to FIG. 2, one of the construction procedures of the present invention will be described.
An example will be described.

(1) An H-section steel mortar column row wall 10 is constructed at a predetermined location as a retaining wall by an H-section steel mortar column row wall method, and the site is closed. The inside of the H-section steel mortar column wall 10 is excavated, and the soil portion inside the H-section steel mortar column wall 10 is cut to expose the surface of the H-section steel 11.

(2) A foundation 8 and a basement floor 9 are constructed at the deepest part by a usual construction method.

(3) An outer wall reinforcing bar 14 is arranged inside the column wall 10 of the H-section steel mortar, and a precast reinforced concrete formwork 1 is installed as a wall formwork inside the inside, and a large number of through-holes 5 are provided. One end of the bolt 16 is welded to the surface of the H-section steel 11 and the other end is tightened to fix the precast reinforced concrete formwork 1 to the H-section steel 11. The bolt 16 functions as a separator that fixes the precast reinforced concrete formwork 1 to the H-shaped steel 11 and also maintains a constant gap between the H-shaped steel mortar column wall 10 and the precast reinforced concrete formwork 1.

In addition to the wall formwork, necessary upper beam formwork and floor formwork are assembled and concrete 12 is cast.

(4) After the concrete is hardened, the beam form and the floor form on the upper floor are dismantled and removed, but the precast reinforced concrete form 1 is not removed but forms the inner wall of the underground wall.

FIG. 2 shows an example in which an H-shaped steel soil mortar column wall method is employed as a method of constructing an existing retaining wall. However, the existing retaining wall is formed by another H-section horizontal sheet pile method. May be built. The bolt 16 can be welded to the steel material as the core material of the retaining wall, and the precast reinforced concrete formwork 1 can be fixed to the steel material of the existing retaining wall via the bolt 16. The steel frame material, which is the core material of the retaining wall, is H
Not only the shape steel, but also a T shape, an L shape and a groove shape may be used.

[0024]

【The invention's effect】

(1) By using a precast reinforced concrete formwork in which a weir plate is attached to the reinforcing rib side as a buried wall formwork, a double wall having a cavity between the outer wall and the inner wall can be constructed simultaneously with the construction of the underground outer wall, The labor and time for double wall construction can be greatly reduced.

(2) Since the thickness of the precast reinforced concrete formwork corresponding to the inner wall can be made smaller than the thickness of the conventional inner wall, the area of the basement becomes larger.

[Brief description of the drawings]

FIG. 1 shows a precast reinforced concrete formwork used in the present invention, wherein (a) is an elevation view with the formwork installed, and (b) is a plan view with the formwork installed. is there.

FIGS. 2A and 2B show a pressure-resistant outer wall of a building underground constructed according to the present invention, wherein FIG. 2A is a longitudinal sectional view, and FIG.

FIG. 3 is a vertical sectional view showing a building underground outer peripheral pressure-resistant wall constructed by a conventional construction method.

[Explanation of symbols]

1. Precast reinforced concrete formwork, 2. Dam plate, 3. Reinforcement rib, 4. Insert, 5. Bolt through hole, 6. Hollow, 7. Precast reinforced concrete plate, 8. Foundation concrete, 9 basement floor concrete, 10 H-section steel mortar column wall,
11 ・ ・ H-section steel 、 12 ・ ・ Underground outer wall concrete 、 13
..Concrete blocks, 14. Underground outer wall reinforcement,
15. Waterproof material, 16 bolts.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) E02D 29/00 E02D 29/045-29/055 E02D 5/18-5/20

Claims (2)

(57) [Claims] (A) A step of arranging reinforcing bars inside an existing retaining wall, (B) A plurality of reinforcing ribs extending in a longitudinal direction, and a dam plate is mounted on the reinforcing ribs. A step of installing a precast reinforced concrete formwork inside the reinforcing bar and fixing the precast reinforced concrete formwork to a steel frame as a core material of the retaining wall with bolts; (C) a step between the retaining wall and the weir plate; A method for constructing a concrete basement outer peripheral pressure-resistant wall consisting of a process of casting concrete. 2. The method according to claim 1, wherein the vertical seam of the precast reinforced concrete formwork is a split seam, and a waterproof material is provided at the overlapping portion.