JPH0213695B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for joining columns and beams in a precast reinforced concrete framework structure.

When connecting columns and beams in a conventional precast reinforced concrete frame structure, considering safety during construction, the length of the PC beam over the column head of the PC column must be 4 to 5 cm or more.

However, if this length is increased,
Since it becomes difficult to place tie bars on the column main reinforcement that protrudes from the column head of the PC column, as shown in Figures 1 and 2, a jaw 2 for beam support is provided at the top of the PC column 1. A PC beam 3 was set on the jaw 2, and joint concrete 4 was placed in the joint space formed between the PC column and the beam at the column head.

As mentioned above, in the conventional construction method in which the jaw 2 is provided at the top of the PC column 1, the jaw 2 becomes an obstacle to the design. It was necessary to provide the cotter 5 to resist shearing forces.

In the figure, 6 is the main column reinforcement, 7 is the column reinforcement, 8 is the beam top reinforcement,
9 is a rib muscle.

The present invention has been proposed in order to eliminate the drawbacks of the conventional construction method, and is provided with a vertical notch extending in the beam growth direction over the entire width of the beam at the longitudinal end of the beam. The lower end protruding piece of the PC beam has the lower end protruding piece protruding adjacent to the lower end of the PC beam.
The reinforcement was placed on the covering part of the column main reinforcement that protruded from the same part of the column head of the PC column, and the band reinforcement was arranged between the column head protruding parts of the column main reinforcement within the joint space formed between the PC column and the beam. The present invention relates to a method for joining columns and beams of a precast reinforced concrete frame structure, which is characterized in that concrete is then poured into the joining space.

According to the present invention, as described above, a vertical notch extending in the beam growth direction over the entire width of the beam is provided at the longitudinal end of the beam, and a lower end protruding piece is provided adjacent to the lower end of the notch. constitutes a PC beam with a protruding structure, and the lower end protruding piece of the PC beam is mounted on the covering part of the column main reinforcement that protrudes from the same part of the column head of the PC column, and the PC beam in the column head is Place joint concrete in the space formed between columns and beams, and
It is designed to connect PC columns and beams.

Therefore, according to the present invention, when joining a PC column and a beam, there is no need to provide a jaw for receiving the PC beam on the capital of the PC column, and the total beam width provided at the longitudinal end of the PC beam is eliminated. Due to the existence of a vertical notch that extends in the beam formation direction, even if the PC beam is set at a position where it touches the column main reinforcement of the PC column, the shear reinforcing band in the PC column at the column head and the beam joint space will be damaged. Reinforcement work can be done easily.

Further, at the longitudinal end of the PC beam, the lower end protruding piece adjacent to the vertical notch also serves as a cotter, so there is no need to provide a cotter on the longitudinal end face of the PC beam as in the conventional case.

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

A indicates a PC beam, and there is a vertical notch 1 at the longitudinal end of the beam that extends in the beam growth direction over the entire width of the beam.
1 is provided, a lower end protruding piece 12 is protruded adjacent to the lower end of the notch 11, and the end of the beam lower end main reinforcement 13 is protruded from the protruding piece 12. L-shaped reinforcing hardware 14 is anchored on both sides of the tip of the piece 12.

Note that the upper end surface of the PC beam A is cut out approximately equal to the thickness of the slab, and the upper end of the rib 15 protrudes above the cutout.

Then, the lower end protruding piece 12 of the PC beam A is set in the covering part of the main reinforcement 16 of the PC column B at the head of the PC column B from which the main reinforcement 16 of the column protrudes, and In the joint space, the column reinforcements 17 are arranged on the column main reinforcements 16. At this time, the above
Due to the existence of the vertical notch 11 in the PC beam A, even if the PC beam A is set at a position in contact with the main column reinforcement 16 in the PC column B as described above, the column reinforcement 17 in the column-beam joint space Reinforcement work can be done easily.

The reinforcing hardware 14 of the PC beam A is welded to the hardware buried in the capital of the PC column B to ensure safety during temporary construction.

Furthermore, the main reinforcing bars 18 at the upper end of the beam are passed through the protruding part of the upper end of the reinforcing bars 15 of the PC beam A and the upper part of the column and beam joint space, and concrete 19 and 20 are placed in the column and beam joint space and the upper part of the PC beam A. Then, the PC columns and beams and the PC floorboards (not shown) whose ends are mounted on PC beams A are joined together.

[Brief explanation of drawings]

1 and 2 are longitudinal cross-sectional views and plan views showing the column and beam joints of a conventional precast reinforced concrete framework structure, respectively, and FIGS. 3 and 4 are respectively a plan view and a column constructed by the method of the present invention. Figure 5 shows a longitudinal section and a plan view showing the column and beam joints of the precast reinforced concrete frame structure, and Figure 5 is a slope view of the PC beam. A...PC beam, B...PC column, 11...vertical notch,
12... Lower end protruding piece, 16... Column main reinforcement, 17... Column strip reinforcement.

Claims (1)

[Claims] 1. A vertical notch extending in the beam growth direction over the entire width of the beam is provided at the longitudinal end of the beam, and a lower end projecting piece is protruded adjacent to the lower end of the notch.
The lower end protruding piece of the PC beam is mounted on the covering part of the column main reinforcement that protrudes from the same part of the column head of the PC column, and the column head of the column main reinforcement is placed in the joint space formed between the PC column and the beam. A method for joining columns and beams in a precast reinforced concrete frame structure, which comprises placing tie bars between protruding parts and then pouring concrete into the joining space.