JPH05280149A - Precast reinforced concrete pole - Google Patents

Abstract

PURPOSE:To save lobor, and to reduce cost by facilitating conveyance and disposal while obtaining the arrangement of a pole main reinforcement and the degree of freedom of execution and improving joint performance, execution performance, efficiency and reliability. CONSTITUTION:A plurality of sheathed pipes 4 for pole main reinforce-ments are penetrated vertically and buried to a solid-shaped precast concrete main body section 1, into which a plurality of hoops 3a, b, c are buried, at peripheral intervals. Splicing bars 5 are positioned along and mounted at the central sections of the sheathed pipes 4, and constituted in the intermediate-stage lap joint sections 4, 5 of the pole main reinforcements 9a, b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast reinforced concrete column material for a reinforced concrete rigid frame structure.

[0002]

2. Description of the Related Art In the construction of reinforced concrete ramen structures, a pre-assembled construction method has been developed in which steel bars are assembled in advance in factories, etc., and the assembled steel bars are delivered to the construction site and arranged. The manufactured single-piece precast reinforced concrete pillar material, the same beam material, the same floor material, the same wall material, etc. are brought into the construction site and placed, and concrete is placed at each joint to form an integrated structure ( The method of constructing as a structure has been developed and popularized, and the construction accuracy has been improved as well as the saving of formwork, the simplification of the process, the improvement of efficiency, the shortening of the construction period.

The conventional precast reinforced concrete pillars are solid precast concrete (PC).
A large number of strip reinforcements (shear reinforcement reinforcements) and multiple column main reinforcements are embedded in the main body part, and multiple steel pipe joints are placed in the lower part of the column main reinforcements. The upper part is fitted to the steel pipe joint to form a steel pipe joint part in the lower part of the main body part.

[0004]

In the conventional precast reinforced concrete column material, as described above, the main reinforcement of the column is embedded in the main body of the precast concrete and a part of the main reinforcement is projected, so that the reinforcement of the main reinforcement and the degree of freedom of construction are reduced. Without this, it will be an obstacle to transportation and arrangement. Further, the steel pipe joint embedded in the lower portion of the main body portion, the protrusion of a short column main bar protruding from the floor is inserted to inject grout material, and the column at the lower end of the column material with relatively large stress Since it is a joint mechanism that connects the upper and lower parts of the main bar by abutting, there is a problem in construction efficiency, reliability of structural strength, etc., such as the accuracy of the insertion position of the upper end of the main bar in the steel pipe joint is required. ..

The present invention was developed in order to address the above-mentioned problems, and the object of the present invention is to facilitate transportation and arrangement, and also to arrange the main bar of the column and the construction. It is intended to provide a precast reinforced concrete column material which has flexibility and improves joint performance, construction performance, efficiency and reliability, and which enables labor saving and cost reduction.

[0006]

According to the present invention, a plurality of sheath pipes for column main bars are vertically penetrated and embedded in a solid precast concrete main body in which a large number of stirrups are buried. As a precast reinforced concrete column material that was constructed in the middle lap joint part of the column main bar by arranging the reinforcement bar in the center of the sheath tube, it facilitates the construction and adjustment of the column main bar along with the transportation and installation, and the construction efficiency, Improves reliability such as accuracy.

[0007]

[Operation] The precast reinforced concrete column material is sheathed from above to the projecting portion of each column main bar on the floor, inserted into each sheath tube and built in, and after the beams and floor materials are arranged, the column main bar is sheathed. Inserted from the upper part of the tube and abutted on the protruding part of the column main bar, grout is injected into each sheath tube from the lower part, and the column middle stage with relatively small stress is added by the reinforcement bar arranged along each sheath tube. The column main bars are easily and accurately and strongly connected to each other, and the column main bars are not buried and can be easily transported and placed at a desired position, and the main bars can be arranged and adjusted freely. , Pillars can be easily constructed to desired strength with high precision.

[0008]

EXAMPLES FIGS. 1 and 2 show examples of the precast reinforced concrete column material of the present invention. In the figure, 1 is a precast concrete (PC) main body, 3a, b, and c are stirrups (shear reinforcements), 4 is a sheath tube for column main bars, 5 is splint,
9a and 9b are column main reinforcements, and a plurality of sheath pipes 4 for column main reinforcements 9a and b are arranged at circumferential intervals on a solid precast concrete main body 1 in which a large number of strip reinforcements 3a, b and c are embedded. It is vertically inserted and embedded, and a reinforcing bar 5 is provided along the central portion of the sheath tube 4 so that the middle lap joint section 4 of the column main bars 9a and 9b is formed.
It is the precast reinforced concrete pillar material 10 configured in 5.

The precast reinforced concrete column material 1
0 is for reinforced concrete ramen structure to form and bend the basic frame with beams, floors, walls, etc.
In addition to shearing, axial force is also required to resist buckling, and when the structure is a relatively low layer, as shown in FIG. 2 (A), the cross-sectional area of the precast concrete main body 1 and the sheath pipe 4 And the reinforcing bar 5 is reduced, and the stirrup (shear reinforcing bar) is composed of the main stirrup 3a and the sub stirrup 3b. When the structure is relatively high, as shown in FIG. Along with the cross-sectional area of the main body portion 1, a sheath tube 4 and a supplementary bar 5 are added, and the stirrups consist of a main stirrup 3a and a plurality of sub stirrups 3c, or FIG.
As shown in (C), a stirrup composed of the main stirrup 3a and the plurality of sub stirrups 3b and 3c is applied to set the required strength. The middle-stage lap joint portions 4 and 5 of the present invention have two to three additional reinforcements 5 arranged opposite to each other on the side of the sheath tube 4 as shown in the figure, and as shown in FIG. It is arranged over.

As shown in FIG. 1, the precast reinforced concrete column member 10 of the present invention is fitted with a sheath from above to the protruding portion of each column main bar 9a on the floor, and inserted into each sheath tube 4 to be built therein. The projecting portion of the column main bar 9a is the sheath tube 4
It is inserted up to the central part of and is built with high accuracy by simple support work. Next, after arranging the beam and the floor material, the column main bar 9b is inserted from the upper part of each sheath tube 4 and abutted against the upper end of each column main bar 9a, and the grout material is preferably injected from below,
By the sheath tubes 4 and the plurality of reinforcing bars 5 arranged along the sheath tubes 4, the pillar main bars 9a and 9b are easily and strongly connected at the central portion of the pillar with relatively small stress, that is, the middle step. In addition, the column main bar is not buried and can be easily transported and installed at a desired position, and the column main bar can be selected and its protrusions can be adjusted freely to construct it to the desired strength. Will be constructed.

[0011]

The present invention has the above-mentioned structure.
The precast reinforced concrete pillar material is easily transported,
The sheath is installed from above into the upper end of the column main bar protruding above the floor and inserted into each sheath tube, and the column main bar is inserted from the upper part of each sheath tube, and the grout material is inserted into each sheath. By injecting into the pipe, the main reinforcement of the column is accurately and strongly connected at the middle step of the column where the stress is comparatively small, by the reinforcements arranged along with each sheath pipe, and the arrangement and the construction of the main reinforcement are free. Adjusted, the joint performance of the column main bar, the construction performance of the column, efficiency and reliability are improved, and there are advantages such as labor saving and cost saving.

[Brief description of drawings]

FIG. 1 is a vertical sectional view (A), an enlarged view of a main part (B) and a plan view (C) showing an embodiment of the present invention.

FIG. 2 is a plan view of a low-rise reinforced concrete rigid-frame structure and a high-rise reinforced concrete rigid-frame structure according to another embodiment of the present invention, and each plan view of the other embodiment (A).
~ (C)

FIG. 3 is a stress distribution diagram in a column.

[Explanation of symbols]

 1 Precast concrete main body 3a, b, c Strip reinforcement 4 Sheath pipe 5 Reinforcement 9a, b Column main reinforcement

Claims (1)

[Claims] 1. A plurality of sheath pipes for column main bars are vertically penetrated at a circumferential interval in a solid precast concrete main body in which a large number of stirrups are buried, and a central portion of the sheath pipe. A precast reinforced concrete column material characterized in that it is configured as a middle-stage lap joint part of the column main bar with a reinforcement bar along the section.