JPH06185085A - Basement floor body construction of building - Google Patents

Abstract

PURPOSE:To reduce the period and cost of a construction employing the reverse placing process. CONSTITUTION:Girders 2 below the first floor are made of steel structure (S made) and the column of the first floor in basement and the columns below the first floor in basement are made of SRC and RC respectively (the column of the first floor in bassement may be made of S). The girder 2 made of S is connected to the steel structure column 9 by high-tension bolts or welded thereto in the first floor and further, connected to the permanent substructural column 3 by high-tension bolts in the first floor in beasement or below. The floor slab 7 is placed by a construction method without use of posts. And construction works such as forms of beams, bar arrangement, placing concrete are dispensed with. And also erection work of struts supporting forms for floor slabs 7 and reinforcement of the ground for posts are dispensed with. Moreover, the joint work of the girder 2b made of S and the structural post 3 is simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure such as a frame in a basement of a building (a basement frame constructed by a reverse driving method).

[0002]

Prior Art and Problems to be Solved by the Invention
Conventionally, as the structure of the basement structure of this type, reinforced concrete construction (RC construction) is used even in the construction employing the reverse driving method.
Steel reinforced concrete construction (SRC construction) is often adopted.

However, the base structure of the basement is made of RC or SRC.
The construction requires a long construction period and high construction cost.

The present invention was devised in view of the above-mentioned circumstances, and an object thereof is to provide a basement structure structure for a building which can reduce the construction period and cost of the construction employing the reverse driving method. It is in.

[0005]

According to the basement skeleton structure of the present invention, the large beams below the first floor are made of steel (S), the columns of the first basement are SRC, and the columns below the second floor are RC. (The pillars on the 1st basement floor may be S structures). In addition, the S-structured girder is welded to the steel column on the first floor with high-strength bolts or welded, and on the basement floor and below, high-strength bolted to the true columns. In addition, the floor slab will be constructed without columns.

[0006] By adopting such a basement skeleton structure, beam formwork, bar arrangement work and concrete work are unnecessary. In addition, it is not necessary to construct a pillar to support the formwork of the floor slab or to reinforce the ground supporting the pillar. In addition, the work of joining the S-structured large beam and the structural column will be simplified.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The basement structure of a building according to the present invention will be described below with reference to the illustrated embodiments.

The basement structure 1 in the building 4 (see FIGS. 1 to 3) is made of steel beams for the large beams 2a and 2b below the first floor, and the columns of the first basement floor are made of steel or reinforced concrete, and are underground. The columns below the second floor are made of reinforced concrete, and the large beams of steel frame are made by high-strength bolting or welding to the steel columns 9 on the first floor.
High strength bolt connection.

Construction of a building employing the basement frame structure 1 having such a structure is carried out as follows.

First, immediately after concrete casting of the cast-in-place concrete pile 8, a steel frame in which a steel frame column and a structure column are integrated is built at a predetermined position. In addition, a bracket is attached by welding in advance to the place where the first-floor steel beam 2a on the pillar head of the steel column 9 is fitted. Also, the steel beam on the first basement floor 2b
The gusset plate 5 is attached by welding at the factory to the true pillar 3 which is used for the assembly.

Next, after the first root cutting, the large beam 2a on the first floor is bolted to a bracket with a steel frame by high strength bolts. Then 1
Build a slab on the floor.

Next, after the second root cutting, the S-shaped large beam 2b on the first basement floor
Is attached to the true pillar 3, and the slab on the first basement floor is constructed.
The joining method is to bond the web plate 6 of the steel frame beam to the gusset plate 5 with a true column by high strength bolting.

Although the holes of the bolts are generally circular here, they may be made loose holes in the horizontal direction in consideration of poor installation accuracy of the true column 3. This loose hole may be the case of only the gusset plate 5, the case of only the steel beam 2b, or the case of both.

Next, when the basement is the third floor or more, the construction is performed in the same manner as the above-mentioned first basement floor. The structure and construction method of the first floor are the same regardless of the number of floors. Further, the construction method is the same as the method of joining the structure column and the S-beam, regardless of whether the structure column is H-shaped steel, square steel pipe, or round steel pipe. Furthermore, the cross-sectional shape of the true post 3 may be square, round, cross-shaped, etc. in addition to the H-shape of the embodiment.

As for the connection between the S-shaped large beam on the first floor and the steel frame column, there are a method of directly welding the large beam to the column without a bracket and a method of joining by a high split method.

[0016]

According to the present invention, the construction period required for the basement frame construction work can be significantly shortened and the construction cost (cost) required for the basement frame construction work can be reduced. Further, since the formwork, rebar work and concrete work are significantly reduced, it is possible to reduce the number of site workers.

Further, the construction waste (particularly the formwork material that cannot be used) is reduced, and the amount of material to be carried into the site can be reduced. Moreover, even in case of rain, excavation work of soil and skeleton work of the basement can be carried out.

[Brief description of drawings]

FIG. 1 is a schematic view showing a basement structure structure of the present invention.

FIG. 2 is an enlarged view of part A in FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

1 ... Basement frame structure, 2a, 2b ... Large beam, 3 ... Structural column, 4 ... Building, 5 ... Gusset plate, 6 ... Web plate, 7 ...
Floor slabs, 8 ... cast-in-place concrete piles, 9 ... steel columns.

Claims (1)

[Claims] 1. A girder below the first floor is made of steel frame,
The pillars on the first basement floor are made of steel or reinforced concrete, the pillars on the second floor and below are made of reinforced concrete, and the large beams of steel construction are made of high-strength bolts or welded to the steel pillars on the first floor. In, the basement structure of the building, which is characterized by the high strength bolt connection to the true column.