JPH04202949A - Precast steel framed reinforced concrete pillar - Google Patents

Abstract

PURPOSE:To save labor by welding between the end parts of steel pipes and pillar main reinforcements which are embedded in unit precast pillar members adjoining in the up and down direction and projected from the pillar members. CONSTITUTION:Between the end parts of steel pipes 2 which are embedded in unit precast pillar members 1 adjoining in the up and down direction and projected from the upper and lower ends of the pillar members 1 is welded (w). Further, between the projecting end parts of pillar main reinforcements 3 which are embedded in the pillar members 1 and projected from the upper and lower ends of the pillar members 1 is welded (w).

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a precast steel reinforced concrete column.

(Prior Art) Conventional steel-framed reinforced concrete structures are constructed using cast-in-place concrete, which requires reinforcement work, formwork assembly, and concrete pouring in addition to steel work.

In recent years, there have been cases of precast beam members for steel-framed reinforced concrete construction, but there have been no cases of precast column members.

Furthermore, during construction, columns are often erected using H-shaped or cross-shaped H-shaped steel as one member of about 3N.

(Problems to be Solved by the Invention) Steel-framed reinforced concrete construction using cast-in-place concrete requires many types of work, so it cannot be said to be a construction method suitable for the current situation where there are many problems in the construction labor situation.

For this reason, as mentioned above, there are cases in which beam members are precast, but when trying to precast column members, many difficulties arise in terms of joining the members or lifting weight.

In other words, from the point of view of tA weight, it is desirable that each member be within the capacity of the crane, so the existing column members are approximately 1
The number of layers is the limit. If one layer of columns were precast, the advantages of precasting would be diminished because the number of parts to be joined would increase.

The present invention was proposed in view of the above circumstances, and its purpose is to provide a precast steel reinforced concrete structure that has excellent workability and can significantly save labor in form work, reinforcement work, and concrete work at work sites. The point is to provide a pillar.

(Means for Solving the Problems) In order to achieve the above object, the precast steel reinforced concrete column according to the present invention includes a steel pipe with a polygonal or circular cross section built into the concrete column body, and a column reinforcing bar surrounding the steel pipe. consisting of a unit precast column member configured such that the upper and lower ends thereof respectively protrude from the upper and lower ends of the column frame, and welding between the ends of each steel pipe and main reinforcement of the vertically adjacent same unit precast column member. It is configured as follows.

(Function) The precast steel reinforced concrete column according to the present invention has the following features:
By using polygonal, shaped, or circular cross-section steel pipes as column steel frames instead of conventional shaped steel materials, the column weight can be significantly reduced. It is composed of unit precast column members that protrude from the upper and lower ends, and by welding the protruding ends of each steel pipe and main reinforcement of the adjacent unit precast column members, it is long, lightweight, and easy to lift. It is made of precast steel-framed reinforced concrete columns with few joints.

(Example) The present invention will be described below with reference to the illustrated embodiments.

1 to 3, reference numeral 1 denotes a unit precast column member, in which a box-shaped steel pipe 2, a main reinforcement 3 surrounding the steel pipe 2, and a tie reinforcement 4 are built in, and the upper and lower ends of the steel pipe 2 and the main reinforcement 3 of the column are built-in. protrude from the upper and lower ends of each member, and at the column-beam joint position,
An H-shaped steel frame 5 and beam main reinforcements 6 are provided in a protruding manner. The beam steel frame 5 is welded to the steel pipe 2, and the beam main reinforcement 6 is inserted into the beam main reinforcement insertion hole 6a of the steel pipe 2.

Then, the protruding ends of the column steel frames 2 and main bars 3 of the vertically adjacent unit precast column members 1 are welded W to form 2 to 3 layers.
Construct a precast steel reinforced concrete column with a height equal to the height of the story.

The joint portion of the upper and lower unit precast column members 1 is as follows:
Locate it near the center of the floor height where bending stress is low.

In the illustrated embodiment, as described above, the column steel frame of the unit precast column member 1 is constructed from a box-shaped steel pipe 1 instead of the conventional shaped steel material, thereby reducing the weight, and by joining a plurality of unit precast column members 1. Constructing a long yet lightweight precast steel reinforced concrete column, it greatly saves labor in formwork work, reinforcement work, and concrete work at work sites, and also makes lifting easier and reduces the number of joints. Together, this can improve workability.

In the figure, 7 is a horizontal diaphragm provided in the box-shaped steel pipe 2 at the column-beam joint, and 8 is a gap for filling after concrete.

FIGS. 4 and 5 show another embodiment of the present invention, in which only the column-beam joints in the box-shaped steel pipe 2 are first filled with concrete 7 to reinforce and stiffen the joints.

In the figure, parts equivalent to those of the above embodiment are given the same reference numerals.

61 and 7 show other embodiments of the present invention, in which the beam reinforcing bars are omitted at the beam joint position of the unit precast column member l, and the reinforcement bars 3 exposed between the upper and lower column concrete parts are Stir reinforcing bars 4 are arranged so as to be integrated with the beam slab concrete.

FIGS. 8 and 9 show still another embodiment of the present invention, in which a beam main reinforcement 3 is provided protruding from the box-shaped steel pipe 2 at the column-beam joint in the embodiment.

In the figure, parts equivalent to those of the above embodiment are given the same reference numerals.

When pouring concrete at the joints of the unit precast column members 1, the top of the joint concrete is slightly lowered and the concrete is poured using the reverse pouring method, and the gap is filled with expanded mortar.

Moreover, a circular steel pipe may be used instead of the box-shaped steel pipe 2.

(Effects of the Invention) According to the present invention, as described above, a column member of a steel reinforced concrete structure is precast by welding the upper and lower end protrusions of the steel pipe and main bar built into the concrete column body, and compared. In combination with beam members that can be easily precast, it is possible to significantly save labor in formwork work, reinforcing steel work, and concrete work at work sites.

In addition, by using steel pipes for the column steel frames instead of conventional shaped steel materials, the weight is reduced, and long column members are constructed, reducing the number of joints, making it easier to lift, and improving workability. It is.

According to a second aspect of the present invention, a beam steel frame and a main beam reinforcement are provided to protrude from the steel pipe at the column-beam joint portion, thereby facilitating the work of joining the columns and beams.

According to a third aspect of the invention, the strength and rigidity of the beam-column joint of the steel pipe are increased by filling the beam-column joint with concrete.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of a precast steel reinforced concrete column according to the present invention, and FIGS. 4 is a front view showing another embodiment of the present invention, FIG. 5 is a view taken along arrow C-C in FIG. 4, FIG. 6 is a front view showing another embodiment of the present invention, and FIG. 7 is a front view showing another embodiment of the present invention. 6 is a view along the arrow DD, FIG. 8 is a front view showing still another embodiment of the present invention, and FIG. 9 is a view along the arrow E-- in FIG.
This is diagram E. l... Unit precast concrete member, 2 - Box steel pipe, 3... Column main reinforcement, 5... Beam steel frame,
6...Beam main reinforcement. Agent: Patent attorney Shige Okamoto (1 person) No changes to the contents of the drawings) Fig. 1 Fig. 2 Fig. 1. 1 Jyo 5 4 Marais Kakuji Proceedings Amendment Form) April 9, 1991

Claims (1)

[Scope of Claims] 1. A steel pipe with a polygonal or circular cross section built into a concrete column body, and a column reinforcing bar surrounding the steel pipe, so that the upper and lower ends thereof respectively protrude from the upper and lower ends of the column body. 1. A precast steel reinforced concrete column comprising unit precast column members constructed by welding the ends of each steel pipe and column main reinforcement of vertically adjacent same unit precast column members. 2. The precast steel reinforced concrete column according to claim 1, wherein a beam, a steel frame, and a main beam reinforcement are provided protruding from the steel pipe at the column-beam joint. 3. The precast steel reinforced concrete column according to claim 1, wherein the steel pipe at the column-beam joint is filled with concrete.