JP2677159B2 - Structure using covered steel tube concrete columns - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure using a coated steel pipe concrete column in a steel frame / reinforced concrete building.

[0002]

2. Description of the Related Art Despite the advantages that a coated steel tubular concrete column does not require a fireproof coating as seen in a steel tubular concrete column, and does not require supporting work when building it like a reinforced concrete column, A general coated steel pipe concrete column requires a formwork at the time of construction, and the advantage of using a steel pipe cannot be utilized. Therefore, it is rarely used and is often a steel pipe concrete column or a reinforced concrete column.

[0003]

A concrete column made of steel pipe requires a diaphragm to prevent the steel pipe from expanding outward at the joint between the column and the beam. Conventional diaphragms include a through-diaphragm system, an inner diaphragm system, an outer diaphragm system, and the like, each having advantages and disadvantages. In the case of the through-diaphragm system, the columns must be cut and joined again, and it is difficult to secure the accuracy. The inner diaphragm method requires a special welding technique called electro-slag welding, requires a large amount of work equipment, and requires a special technique for the work itself.
Further, the outer diaphragm method has a drawback that it interferes with the finishing material because it protrudes more than the corners of the columns and beams.

In the case of reinforced concrete columns, since the columns cannot bear the load at the time of construction, a large-scale support work is required under the beams, which complicates the work. Further, in the case of a conventional coated steel pipe concrete column, when placing a coated concrete, a form is required and the advantage of using a steel pipe cannot be utilized. In the case of ordinary steel pipe concrete columns, when connecting columns, the steel pipe is a bearing element that bears most of the bending stress and it is difficult to join at the upper end of the floor where the bending moment is large. Will be inherited.

[0005] Therefore, the steel pipe at the joint between the column and the beam cannot be reached, and it is difficult to join the beam with bolts.

The present invention has been devised to solve the above problems.

[0007]

[Means for Solving the Problems] A precast reinforced concrete member 1 is used in which a steel pipe column 2 is built into a covered steel pipe concrete column, which is divided at each floor at the floor top level, and a beam 5 is bolted to the steel pipe column 2 to form a steel pipe. A cast-in-place concrete 10 is poured into the inside of the pillar 2 and the joint portion.

[0008]

EXAMPLES Examples of the present invention are shown in FIGS. 1 (a) and 1 (b).

(A) is a top view, and (b) is A of (a).
It is -A sectional drawing.

First, the coated precast reinforced concrete material 1 in which the steel pipe columns 2 are housed is manufactured by dividing the portion B into upper and lower floors. A column main bar 3 and a band bar 4 are embedded in the coated precast reinforced concrete material 1. Here, the steel beam 5 is connected to the steel pipe column 2 with a high-strength bolt 7 via a split T6. Next, the joint bar 8 is arranged in the steel pipe column 2, and the strip bar 4 is wound around the column main bar 3 barely exposed from the coated precast reinforced concrete material 1 and the concrete 10 is placed inside the steel pipe column 2 on the floor. The coated precast reinforced concrete material 1 containing the steel pipe columns 2 on the floor after hardening of the cast-in-place concrete 10 is arranged, and the joint bars 9 are used to join the column main bars 3 on the upper and lower floors. The structure of covered steel pipe concrete columns and beams is constructed in the same procedure below.

[0011]

When the steel pipe column is filled with concrete by using precast reinforced concrete as the covering material, a diaphragm is not required because the steel pipe column is restricted from expanding outward. Further, since the steel pipe column bears the vertical force, large-scale support work unlike the conventional reinforced concrete column is unnecessary. Since the reinforced concrete of the covering member bears most of the bending stress, the steel pipe column need only transmit the force at the joint bar. Therefore, steel pipe columns can be spliced at the top of the floor,
The beam can be bolted by inserting a hand into the steel pipe column when building. Since most of the covering material is precast reinforced concrete, there is no need for a large-scale formwork like conventional covered steel tube concrete columns. Further, the steel pipe concrete column requires a fireproof coating, but the present invention does not require a fireproof coating.

[Brief description of the drawings]

FIG. 1 (a) is a top view of the present invention. FIG. (B) It is AA sectional drawing of FIG.2 (a).

[Explanation of symbols]

1-Coated precast reinforced concrete material, 2 ...
・ Steel pipe columns, 3 ... column main bars, 4 ... belt bars, 5 ...
Beam, 6 ... Split T, 7 ... High-strength bolt, 8 ...
..Splices, 9 ... Joint hardware, 10 ... Cast-in-place concrete

Claims (1)

(57) [Claims] 1. A precast reinforced concrete member 1 that is divided into floor materials for each floor at the floor top level and has a steel pipe column 2 built therein. A beam 5 is bolted to the steel pipe column 2 to connect the steel pipe column 2 to the joint. The part is made of cast-in-place concrete 10. Structure using covered steel tube concrete columns.