JPH04161617A - Underground external wall - Google Patents

Abstract

PURPOSE:To economically form an underground external wall by providing shear connectors in a soil column piles and integrating a reinforcing concrete wall with a sheath wall. CONSTITUTION:First of all, cement slurry is poured while digging the underground to be mixed with dug sediment. Before they are hardened, an H-shaped steel is built in and stabilized after their hardening. In the next step, the ground within the lot is dug, and in the half way or after the digging, a soil part, which becomes an external form along the back face of the inner side flange 2 of the H-shaped steel, is cut, and an L shaped stud bolt 3 is welded and fixed on the surface of the flange 2. In the next step, the reinforcing bars 5 and inner form of the sheath wall 4 are assembled, and concrete is placed in the underground beam, and concrete is placed while integrating the sheath wall 4 with the H-shaped steel.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an underground external wall in which a temporary retaining wall is permanently installed.

(Conventional technology) Conventional soil column piles were used as temporary retaining walls and were not incorporated into permanent construction.

Fill column piles are made by injecting cement slurry into the ground while digging a hole, mixing it with the excavated soil, and before the soil hardens, H-beams, steel pipes, etc. are erected to form the pile.

(Problems to be Solved by the Invention) The prescriptive soil column piles were intended to be used as temporary retaining walls.

Mountain retaining costs often account for a relatively high amount of construction costs, and since the main underground outer wall is designed to receive the necessary soil support, two types of walls were constructed to receive redundant earth pressure. It was supposed to be done.

The present invention has been made in view of the above circumstances, and its purpose is to provide an economical underground exterior wall that efficiently utilizes soil columns and piles.

(Means for Solving the Problems) In order to achieve the above object, the underground external wall of the present invention is characterized in that shear connectors are provided on the fill column row piles and integrated with the reinforced concrete wall to constitute a permanent earth retaining wall. shall be.

(Function) The reinforced concrete wall and the column piles are integrated via shear connectors installed on the column piles to form the permanent earth retaining wall (underground outer wall).

This earth retaining wall will be a composite wall of soil column piles and reinforced concrete walls.

Earth pressure acting on the composite earth retaining wall acts to create tension and shear on the shear connector. Therefore, the soil column piles always act to resist bending due to the tonosho.

The synthetic earth retaining wall constructed in this way will be used as it is as the permanent underground outer wall.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Basically, in this embodiment, shear connectors are provided on the fill column piles and integrated with the reinforced concrete wall to form the permanent earth retaining wall. H-beam steel, steel pipes, etc. are used as soil column piles. Further, as the shear connector, an L-shaped stud bolt or the like, a steel plate (CT material) in the shape of a single reinforcing bar bent in a U-shape, etc. are used. Furthermore, the arrangement density of shear connectors is determined by earth pressure stress, and H-shaped steel and steel pipes are constructed by taking into account the occurrence of rust as a cross-sectional defect.

Fig. 1 first explains soil column piles, in which cement slurry is injected while digging a hole in the ground, and the excavated earth and sand are mixed with the cement slurry.

Next, the H-beam 1 is erected before the cement slurry and excavated soil harden. The cement slurry hardens and the built H-beam 1 becomes stable.

Thereafter, the site is excavated, and if necessary, a strut is installed, or a fill portion that will become the outer formwork is cut along the back surface of the flange 2 inside the H-section steel 1 during or after the excavation.

At the same time, an L-shaped stud bolt 3 is welded and fixed to the surface of the flange 2.

After the excavation is completed, in addition to the stud bolts 3, the reinforcing bars 5 of the retaining wall 4 are
erected the inner formwork and poured concrete for the underground beams,
The earth retaining wall 4 is also constructed by pouring concrete while combining it with the H-shaped steel 1.

After demolding, the earth retaining wall 4 is completed by combining with the H-section steel 1 as shown in FIG.

This earth retaining wall 4 is used as a permanent underground outer wall.

The stud bolt 3 is an L-shaped deformed steel bar stud, and because it is horizontally welded, D16 or less is used, and the concrete wall thickness of the earth retaining wall 4 is about 200 mm.

In addition, since the H-beam 1 is also placed in a wet condition, it is necessary to consider the occurrence of rust as a cross-sectional loss. Use new material as the shape steel.

The number of stud bolts 3 used, that is, the arrangement density, is such that the stud bolts are L-shaped to prevent cone breakage of concrete due to tension.

The earth retaining wall 4 is different from a general composite beam in that the load direction is opposite, so that tensile shear is generated in the stud, which is a binding material between the concrete and the H-section steel.

Therefore, the number of studs is determined based on the earth pressure stress, in addition to the standards for composite beams.

(Effects) As explained in detail above, according to the underground external wall of the present invention, the soil retaining wall is formed by combining the soil column piles and the reinforced concrete wall, so the wall does not become double, and By providing resistance to earth pressure, wall thickness and reinforcing bar diameter can be reduced.

This shortens the construction period and does not reduce the effective area of the site, which is extremely useful from an economic standpoint.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a preferred embodiment of the present invention, and FIG. 2 is a plan view thereof. 1... Fill column pile (H-shaped steel) 2... Flange

Claims (1)

[Claims] An underground exterior wall characterized by installing shear connectors on soil column piles and integrating them with a reinforced concrete wall to form a permanent earth retaining wall.