JP2000297440A - Underground exterior wall and construction thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underground exterior wall and a construction thereof capable of strengthening the integrity between a soil cement column wall and a concrete wall and also resisting in-plane stress. SOLUTION: In an underground exterior wall 1 combining a soil cement column wall 3 on a bedrock side with a concrete wall 4 on the internal side, a precast reinforced concrete core 7 having a fitting recess section 9 is buried in the soil cement column wall 3, and the fitting recess section 9 of the core 7 is filled with concrete to combine the concrete wall 4 with the soil cement column wall 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground outer wall and a method for constructing the same.

[0002]

2. Description of the Related Art Conventionally, an underground outer wall comprising a column wall of soil cement and a concrete wall has a flange 2 of an H-shaped steel 22 embedded in soil cement 21 as shown in FIG.
3 was provided with a connector 24 such as a stud bolt, and the connector cemented the soil cement column wall 25 and the concrete wall 26.

[0003]

However, since the underground outer wall as described above is a construction method in which the H-section steel is dropped into soil cement by its own weight, the flanges protrude or retract without the front faces of the flange being aligned. It was installed in a state. Therefore, in order to strengthen the integration between the soil cement column wall and the concrete wall, it was necessary to lengthen the connector in accordance with the recessed flange or to increase the amount of the connector. Further, the H-section steel has a drawback that it resists out-of-plane stress as a composite structure, but hardly resists in-plane stress.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an underground outer wall capable of strengthening the integration between a soil cement column wall and a concrete wall and resisting in-plane stress. The purpose is to provide a construction method.

[0005]

According to a first aspect of the present invention, there is provided an underground outer wall in which a soil cement column wall on the ground side and a concrete wall on the inner side are integrated. A precast reinforced concrete core having a fitting recess is embedded in the soil cement column wall, and concrete is filled in the fitting recess of the core material to form a core between the concrete wall and the soil cement column wall. And are integrated.

According to the first aspect of the present invention, since the core material is made of precast reinforced concrete, the integration between the soil cement column walls and the concrete walls is strengthened, and it is possible to sufficiently resist in-plane stress.

According to a second aspect of the present invention, in the first aspect, the core is prestressed by a tension member.

According to the second aspect of the present invention, the core material effectively resists pulling due to earth pressure.

The invention of claim 3 is the first or second invention.
Wherein the fitting concave portion of the core material extends outward.

According to the third aspect of the present invention, the removal of the soil cement can be easily performed.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a shear cotter is provided on an inner surface of the fitting recess of the core material.

According to the fourth aspect of the present invention, the integrity of the core material of the soil cement column wall and the concrete wall is enhanced.

According to a fifth aspect of the present invention, in the first aspect, the core member is provided with a shea cotter on a back surface, and the fitting recess is buried facing the ground.

According to the fifth aspect of the present invention, the work of extracting the soil cement can be omitted, and the integrity of the core material of the column wall of the soil cement and the concrete wall can be enhanced only by the shear cotter.

According to a sixth aspect of the present invention, there is provided a precast reinforced concrete core material having a fitting concave portion, and the core material is filled into the column row holes so that the fitting concave portion faces the inner side. After the soil cement was hardened, the soil on the inner side and the hardened soil cement were removed to expose the fitting recesses, and the fitting recesses were opposed to the exposed fitting recesses. An inner mold for a concrete wall is assembled and formed, and concrete is poured into the inner mold.

According to the sixth aspect of the present invention, the welding work of the connector can be omitted, the construction period can be shortened, and the core material of the soil cement column wall and the concrete wall are integrated with each other. Can be easily constructed. In addition, when the accuracy of setting the core material in the soil cement is poor, that is, even when the core material is not installed with the front surface aligned and protrudes or retracts, this error is absorbed by the size of the fitting recess. .

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an underground outer wall and a method of constructing the same according to the present invention will be described below with reference to the drawings. First, the underground outer wall will be described, and then the method of constructing the underground outer wall will be described. FIG. 1A is a sectional view of an underground outer wall according to the first embodiment, and FIG. 1B is a perspective view of a core material.

The underground outer wall 1 is composed of a soil cement column wall 3 on the ground 2 side and a concrete wall 4 on the inner side. The soil-cement column wall 3 is formed by filling column columns 5 excavated in the ground with soil cement 6 and burying core materials 7 at appropriate intervals. The precast reinforced concrete core 7 has a U-shape and is prestressed by a tension member 8 such as a PC steel stranded wire or a PC steel rod, and the fitting recess 9 faces the concrete wall 4 side. This fitting recess 9 is filled with concrete of a concrete wall, and the concrete wall 4 is integrated with the core material 7 of the soil cement column wall 3. That is, the underground outer wall 1 has the convex concrete wall 4 integrated with the core material 7 of the soil cement column wall 3. Also, the convex portion 4a of the concrete wall 4,
That is, the reinforcing bar 10 of the concrete wall 4 is arranged in the fitting recess 9 of the core member 7.

FIG. 2 shows core members 11 and 12 according to another embodiment. (1) is a core member 11 in which a shear cotter 14 is provided in a fitting recess 13. The shear cotter 14 further strengthens the integration between the soil cement column wall 3 and the concrete wall 4. This shea cotter may be of an embossing extent as long as the soil cement 6 can be easily pulled out. (2) is a fitting recess 1
Numeral 5 is a core material 12 made of precast reinforced concrete which becomes wider toward the outside, and the soil cement 6 can be easily pulled out.

FIG. 3 shows an underground outer wall 16 according to a second embodiment, in which a core member 18 made of precast reinforced concrete having a shea cotter 17 on the back surface is used. The core 18 has the same configuration as the core 7 of the first embodiment except for the shear cotter 17.
It is embedded in the soil cement column wall 3 toward the side.
Therefore, the soil cement column wall 3 and the concrete wall 4 are integrated by the shea cotter 17, and there is no need to extract the soil cement 6 from the fitting recess 19.

Hereinafter, a method of constructing an underground outer wall will be described with reference to FIG. First, as shown in (1), the column hole 5 is excavated along the boundary of the site. Soil cement 6 is filled into the column holes 5, and core members 7 made of precast reinforced concrete are pressed into the holes at appropriate intervals. Since the core material 7 is made of precast concrete having an appropriate length, the core material 7 is pushed into the soil cement 6 while being added. In addition, a release material (not shown) is applied to the fitting recess 9 of the core material 7 so that the soil cement 6 can be easily pulled out. Further, in order to facilitate the removal of the soil cement 6, the lower surface and the front surface of the fitting recess 9 may be covered with a lid so that the soil cement 6 does not enter the fitting recess 9.

Next, as shown in FIG. 2B, after the soil cement 6 has hardened, the ground on the inner side is excavated, and the fitting recess 9 of the core material 7 is removed by removing the soil cement 6. Expose. Since the release agent is applied to the fitting recess 9 as described above, the soil cement 6 can be easily suspended.

Next, as shown in FIG.
Reinforcing bars 10 of the concrete wall 4 are arranged on the front surface and the fitting recess 9, and an inner form (not shown) for the concrete wall facing the soil cement column wall 3 is assembled. And concrete 20 is poured into this formwork,
When the mold is disassembled after this is cured, the underground outer wall 1 is constructed in which the soil cement column walls 3 and the concrete wall 4 are integrated by the fitting recess 9 of the core material 7. The construction of the underground outer wall using the core members 11 and 12 of FIG. 2 is performed in the same manner as described above.

FIG. 5 shows a second embodiment of the method for constructing an underground outer wall, and the core material 18 of the second embodiment is shown.
The construction is performed by the same method as the construction method of the underground outer wall 1 except that the above is used. In this case, the work of pulling out the soil cement 6 from the fitting concave portion 19 can be omitted, so that the construction period can be greatly reduced. The application of a release material to the shea cotter 17 on the back surface of the core member 7 and the cover of the shea cotter 17 when the core member 7 is pushed are the same as those in the construction method of the first embodiment.

[0025]

Since the core material is made of precast reinforced concrete, the integration of the core material of the soil cement column wall with the concrete wall is strengthened, and the in-plane stress can be sufficiently resisted.

The core material can effectively resist pulling due to earth pressure.

The removal of the soil cement can be easily performed.

The work of unscrewing the soil cement can be omitted, and the integrity of the concrete wall and the core material of the column wall of the soil cement can be enhanced only by the shear cotter.

The connector welding operation can be omitted, the construction period can be shortened, and the underground outer wall having a strong integration between the concrete wall and the core material of the soil cement column wall can be easily constructed.

If the accuracy of the core material installation in the soil cement is poor, that is, if the core material is not installed with the front surface aligned, but protrudes or retracts, this error is absorbed by the size of the fitting recess. Is done.

[Brief description of the drawings]

FIG. 1A is a sectional view of an underground outer wall according to the first embodiment, and FIG. 1B is a perspective view of a core.

FIGS. 2 (1) and (2) are perspective views of a core material.

FIG. 3A is a cross-sectional view of an underground outer wall according to the second embodiment, and FIG. 3B is a perspective view of a core.

FIGS. 4A to 4C are cross-sectional views illustrating a method of constructing an underground outer wall according to the first embodiment.

FIGS. 5A to 5C are cross-sectional views illustrating a method of constructing an underground outer wall according to the second embodiment.

FIGS. 6A and 6B are cross-sectional views of a conventional underground outer wall.

[Explanation of symbols]

 1,16 Underground outer wall 2 Ground 3,26 Soil cement column wall 4,27 Concrete wall 5 Column hole 6,21 Soil cement 7,11,12,18 Core material 8 Tensile material 9,13,15,19 Joint recess 10 Reinforcement 14, 17 Shea cotter 20, 25 Concrete 22 H-shaped steel 23 Flange 24 Connector

Claims (6)

[Claims] 1. An underground outer wall in which a soil-ceiling column wall on the ground side and a concrete wall on the inner side are integrated, and a core material made of precast reinforced concrete having a fitting recess on the soil-cement column wall. An underground outer wall, wherein concrete is filled in a fitting recess of the core material, and a concrete wall and a core material of a soil cement column wall are integrated with each other. 2. The underground outer wall according to claim 1, wherein the core is prestressed by a tendon. 3. The underground outer wall according to claim 1, wherein the fitting concave portion of the core material extends outward. 4. The underground outer wall according to claim 1, wherein a shear cotter is provided on an inner surface of the fitting recess of the core material. 5. The underground outer wall according to claim 1, wherein a shear cotter is provided on a back surface of the core material, and a fitting recess is buried facing the ground. 6. A precast reinforced concrete core material having a fitting concave portion is manufactured, and the core material is appropriately placed in soil cement filled in a pillar row hole such that the fitting concave portion faces the inner side. After the soil cement has been hardened, the soil on the inner side and the hardened soil cement are removed to expose the fitting recess, and the inner mold for the concrete wall facing the exposed fitting recess is pressed. Assemble and form the frame,
A method for constructing an underground outer wall, comprising casting concrete in the inner formwork.