JPS62121249A - Construction of pillar/beam connection part - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of constructing a column-beam joint in a reinforced concrete structure in which the columns and beams are prefabricated.

(Problems to be solved by the invention) In recent years, in the construction of reinforced concrete buildings, there has been an increasing demand for shorter construction periods, simplification and labor-saving on-site work, etc. A method of constructing a prefabricated framework has been developed.

This invention was made in response to these demands and to provide a method for this purpose, by embedding main reinforcing bars in each concrete IJ-cont formwork that makes up columns and beams and prefabricating them. This is an attempt to rationalize the above.

(Means for Solving the Problems) In the present invention, the main reinforcing bars, etc. are embedded in the formwork of columns and beams, and these are manufactured using precast concrete (IJ), thereby simplifying on-site work and shortening the construction period. We aim to make this possible.

The column formwork is box-shaped with the main reinforcing bars and stirrups buried therein, and the beam formwork is U-shaped with the bottom main reinforcing bars and the lower side of the stirrup buried, forming columns and beams, respectively.

The beam formwork is placed on the upper end of the column formwork opposite each other at its ends. Then, after arranging the lower end connecting reinforcing bars across the beam formwork and connecting the lower end main reinforcement of the beam formwork, the assembled reinforcing bars made up of vertical bars and tie bars are inserted inside the column formwork. Then, the tie reinforcements are placed between the beam forms, and the upper main reinforcements are connected to each other by the upper end connecting reinforcing bars in the same way as the lower end main reinforcements, or by moving the upper end main reinforcements.

After the above assembly work, concrete is poured to form the column and beam joints.

(Example) The present invention will be described below with reference to drawings showing one embodiment.

This invention is a method of assembling column formwork A and beam formwork B made of precast concrete, and pouring concrete IJ-to to form a column-beam joint and a frame.

The column formwork A has the main reinforcement 1a and the tie reinforcement 2a buried in it as shown in Fig. 1.
As shown in Figure 2, the beam form B is hollow and box-shaped, and the lower end main reinforcement 1b and stirrup 2b are buried therein, and the beam form B has a U-shaped cross section as shown in Figures 1 and 6. Ru. The stirrup 2b has its lower side buried, its upper side protrudes, and the upper end main reinforcement 3b is attached to the protruded part.

The lengths of the main reinforcement 1a of the column formwork A, the lower end main reinforcement 1b, and the upper end main reinforcement 6b of the beam formwork B are up to the end of each formwork.

The opposing main reinforcing bars 1a, 1a are connected by an assembly reinforcing bar C, and the lower end main reinforcing bars 1b, ib are connected by a lower end connecting reinforcing bar 4-1.

As shown in Figure 1, the assembled reinforcing bars C consist of vertical bars 1c and tie bars 2c, and are inserted into the column formwork A to the bottom of the ties 2c, with the tie bars 2c located between the beam forms B and B. .

After the column formwork A formed as described above is erected in a predetermined position, the beam formworks B and B are placed on the upper end of the column formwork A with their ends facing each other, and the lower end main reinforcement +b, jtl Nearby, the same beam formwork B
, B, and place lower end connecting reinforcing bars 4-1 to assemble reinforcing bars C.
Insert into column formwork A.

The entire construction procedure for the embodiment shown in FIG. 4 will be explained.

In this embodiment, the upper end main reinforcements 3b and 3b attached to the stirrup 2b are connected to the upper end main reinforcements 3b and 3b in the same way as the lower end main reinforcements tb and +b.
, 3b, and are connected by upper end connecting reinforcing bars 4-3 arranged across the vicinity of 3b. In this case, lower end connecting reinforcing bar 4-1. The upper end connecting reinforcing bars 4-3 have a sufficient anchoring length to achieve the joint effect with the lower end main reinforcing bars 1b and the upper end main reinforcing bars 3b. In addition, as shown in Fig. 3, the lower end main reinforcements 1b, 1 in the intersecting direction
b.

The top main reinforcements 3b and fb are provided with a step in consideration of the reinforcement arrangement of the connecting reinforcing bars 4-1 and 4-3.

First, column formwork A is erected on the column main reinforcement assembled at a predetermined position (I), beam formwork B is erected in one direction, and column formwork A is installed.
2), and the beam form B in the direction orthogonal to this beam form B is similarly placed over the column forms A and A (g).

Next, place the slab PC version 5 on the beam formwork B, place the lower end connecting reinforcing bars 4-1 between the opposing beam formworks B and B, and place the assembled reinforcing bars C into the column formwork A. ■ Insert.

Next, the upper end connecting reinforcing bars 4-3 are arranged across the upper end main reinforcing bars 31) and 31) 4), and after the slab mesh reinforcement 6 is arranged, Edition 5
Construction of the column-beam joint is completed by pouring concrete on top, and the above steps are repeated to construct the frame.

Next, the embodiment shown in FIG. 5 will be described.

In this embodiment, the upper end main reinforcement 6b is temporarily fixed to the stirrup 2b, and after the first assembly reinforcement C is erected, the opposing beam formwork B
, and place reinforcement across the same beam formwork B and B. The upper end main reinforcements 31) and 3b are temporarily fixed in two stages to one of the opposing beam formwork B, and after the beam formwork B and B are placed on the column formwork A, the upper end is temporarily fixed in two stages. The main reinforcements 3b and 5b are slid to the opposing beam formwork B and connected to the upper end main reinforcement 3b.

The method of joining varies, such as gas pressure welding, lap joints, couplers, etc.

First, column formwork A is erected (f), beam formwork B is placed on column formwork A in one direction (ii), and beam formwork B is placed perpendicularly thereto.
A book containing.

Next, install the slab PC version 5 on the beam formwork B and dry it.

Following the reinforcement of the lower end connecting reinforcing bars 4-1, install the assembly reinforcing bars C (funds).

Subsequently, the upper end main reinforcing bars 3b, 3b foamed in two stages are slid to the opposing beam forms B, B, and the upper end main reinforcing bars 3b, 5b are formed.
and mutually joint (material), arrange the slab mesh reinforcement 6 (
4) Place concrete and construct the column/beam joint.

(Effects of the Invention) As described above, in this invention, the frame is constructed from the formwork, and the reinforcement work is simplified, so the on-site work is simplified,
It is possible to save labor and further shorten the construction period.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing how the column/beam formwork and assembly reinforcing bars are assembled, FIG. 2 is a plan view thereof, and FIG. 3 is a vertical sectional view. Figures 4 and 5 are schematic diagrams showing construction instructions. A: Column formwork, 1a: Main reinforcement, 2a: Strap reinforcement, B: Beam formwork, 1
b = bottom main reinforcement, 2b nister wrap. 3b: Upper end main reinforcement, 4-1: Lower end connecting reinforcement, 4-3: Upper end connecting reinforcement, C: Assembly reinforcement, 1C: Vertical reinforcement. 2c: Stirrup muscle, 5 Nislab PC version, 6: Slab mesh muscle. (rl/) q (■) Fig. 4 (n) (IIri (v) (XA) (■) (IX)

Claims (1)

[Claims] (1) A precast concrete column form with main reinforcing bars and stirrups embedded was erected in a designated position, and the lower end main reinforcing bars and stirrups were embedded in the upper end of the column form to create a U-shape. Precast concrete beam forms are placed with their ends facing each other, and the lower end connecting reinforcing bars are placed near the lower end main reinforcement across both beam forms, and then assembled reinforcing bars consisting of vertical bars and tie bars are placed. A construction method for column-beam joints that consists of inserting the steel into the column formwork to the bottom of the stirrups, arranging the upper main reinforcement, and pouring concrete.