JPH0140183B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing not only the outer walls and columns of the underground floor of a building but also the interior walls and columns using underground walls.

Conventionally, diaphragm walls have been constructed only around the outer periphery of structures, such as temporary mountain retaining walls in underground excavation of structures, underground outer walls that bear earth pressure and water pressure as part of the underground main structure of structures, underground outer shear walls, and outer peripheral support piles. ing.

Since an underground continuous wall is constructed only around the outer periphery of the structure, a pier is used to carry out the excavation and earth, and struts or tieback anchors are installed in order according to the excavation depth so that the continuous wall can withstand earth pressure and water pressure. had to be established.

In building the structure, reinforcing steel, formwork, and concrete work generally had to be carried out over the entire area of each floor, and the larger the area of each floor, the more craftsmen were needed at the same time. Also, the more floors the building has underground, the more the above construction and installation of struts, etc.
Because the work overlapped with demolition work, the work became extremely complicated and caused considerable problems in terms of safety management and shortening the construction period.

This invention is intended to improve the above-mentioned problems, and aims to manage work safety, shorten the construction period, and reduce construction costs.

The gist of this invention is ``in the construction of the basement floor of a building, underground walls are constructed horizontally and vertically on the outer periphery of the building and in the parts where walls and columns are arranged inside the building''.

Next, explanation will be given according to the drawings.

Figure 1 shows an example of conventional construction. First, an underground wall 1 around the outer periphery of the building is constructed, and the inside surrounded by the underground wall 1 is excavated, and the underground wall 1 is cut to prevent it from sagging inward. The foundation is built by excavating to a specified depth while installing earth retaining supports such as beams. Next, the pillars 2, walls 3, floor slabs, and beams are constructed. In contrast, in this invention, as shown in Fig. 2, an underground wall 4 on the outer periphery of the building and an underground wall 5 are constructed vertically and horizontally in the area where walls and columns are arranged inside the building from the ground at the same time. do. Since the underground wall 5 is an internal wall, where there are openings such as passages and doors, formwork (styrofoam or the like may be used) is installed in the reinforcing cage in advance to prevent concrete from turning.

Excavation inside the area surrounded by underground walls 4 and 5, and excavation to a specified depth while installing earth retaining supports 6 such as light struts in places where there is no underground wall 5 so that the underground wall 4 does not sag inward. Excavate and build the foundation. The term "minor earth retaining shoring" here refers to one that is shorter than that shown in Figure 1.
For example, if precast concrete beams are used in predetermined positions, they can be used for both temporary and permanent construction, contributing to a reduction in construction costs.

Next, the independent columns 7, floor slabs, and beams will be constructed.

Since the present invention is constructed as described above, the final excavation can be carried out independently for each block partitioned into a box shape, so that the excavation pier for excavation and transporting earth and sand can also be omitted.

Furthermore, since the construction of the structure can proceed independently for each block, even a small number of craftsmen can carry out the construction without delay.

As mentioned above, this invention has various effects,
This allows construction to be carried out safely and quickly.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional construction example, and FIG. 2 is a plan view of a case where this plan is implemented according to the present invention. 1... Underground wall around the outer periphery of the building, 2... Column, 3... Wall, 4
...An underground wall around the outer periphery of the building, 5...An underground wall that becomes an inner wall,
6...Earth retaining support, 7...Independent pillar.

Claims (1)

[Claims] 1. A method for constructing a basement floor of a building, which is characterized by constructing underground walls horizontally and vertically on the outer periphery of the building and in areas where walls and columns are arranged inside the building.