JPH0366850A - Colum/beam joining method in precast concrete structure - Google Patents

Abstract

PURPOSE:To reduce the construction costs by furnishing a PC pillar at its top with a cavity with the top face and side faces opened, folding each exposed strip into the cavity, fitting the end strip of a PC beam in the cavity, and placing concrete after arranging reinforcements. CONSTITUTION:A cavity 1 with the top face and side faces opened is furnished at the top of a PC pillar A, and each strip 3 exposed by this opening is severed in the center and folded into the cavity. A beam bottom strip 6 of a PC beam B is fitted in the cavity 1, and this beam B is supported by a bracket 2. Then reinforcing strips 7 are arranged, and concrete is placed to consolidate the pillar A with beam B. The PC method is also applied to installing a beam to a place with level difference. This reduces concrete placing at site to lead to enhancement of the efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for combining columns and beams in a precast concrete frame structure.

(Conventional technology) In conventional precast concrete framework structures, if the level of the PC beams that connect to the PC columns is significantly different, it is necessary to cancel construction using the PC beams and use a cast-in-place concrete construction method that includes the columns. was common.

(Problem to be solved by the invention) When a level difference is required for the floor, the conventional cast-in-place concrete construction method is used as described above, so the application ratio of the PC construction method is reduced, and the advantages of the PC construction method are reduced. There may be cases where you are not able to perform to your full potential.

The present invention was proposed in view of the problems of the prior art, and when the levels of the PC beams are different, the beam main reinforcement of the same PC beam is fixed in the column-beam joint, and the P.S.
The object of the present invention is to provide a method for joining beams and columns in a precast concrete structure that can be constructed using the C method.

(Means for Solving the Problems) In order to achieve the above object, the method for joining beams and columns in precast concrete construction according to the present invention includes providing a hollow portion with an open top surface and side surfaces in the capital of a PC column, and
Providing a beam support bracket connected to the lower bottom surface of the hollow portion, and exposing the straps to the open side portion of the hollow portion,
After a PC beam formed by cutting the protruding end of the beam end face of the beam lower end reinforcement is mounted on the beam support bracket, a fixing reinforcement is provided in the cavity that passes through the tie reinforcement of the open side portion of the cavity. In addition, after the fixing reinforcement is welded to the cut portion of the lower end of the PC beam, concrete is poured into the cavity integrally with the upper panel zone.

(Function) According to the present invention, as described above, a hollow part for connecting the PC pillar is provided in the capital of the PC pillar, and the top surface and side surfaces are open, and the ties of the pillar are exposed in the hollow part, and the A beam support bracket is provided continuously on the lower bottom surface of the cavity, and a PC beam formed by cutting the protruding end of the beam bottom reinforcement from the beam end surface is mounted on the beam support bracket, and the beam bottom end of the PC beam is mounted on the beam support bracket. The protruding end of the reinforcement is made not to interfere with the reinforcement of the column exposed at the side opening of the cavity in the PC column, and then penetrated into the cavity through the exposed reinforcement of the side opening of the cavity. Arranging a sliding anchor reinforcement, welding the anchor reinforcement to the protruding end cut portion of the beam lower end reinforcement of the PC wire, and arranging the anchor reinforcement integrated with the beam lower end reinforcement of the PC wire in the hollow portion. By pouring concrete into the hollow part together with the upper panel zone, the PC beam can be placed on the side of the PC column via the beam bottom reinforcement, the anchor reinforcement connected thereto, and the poured concrete. It is to be joined together.

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

In other words, it is a PC column, and the column head is provided with a hollow part (1) that is open to the top and side surfaces, and a beam support bracket (2) that is connected to the bottom surface of the hollow part (1) is provided, and the hollow part (1
) The braces (3) of the columns are exposed in the open side parts.

In the figure, (4) is the main reinforcement, and (5) is the top beam support bracket installed on the column head.

+Bl is a PC beam connected with a step from the beam (B') at the top of the PC column (4), and the beam bottom reinforcement (6
) has been cut off.

When the PC beam (81) is mounted on the beam support bracket (2), since the protruding end of the beam bottom reinforcement (6) has been cut off, the side opening in the hollow part (1) of the PC beam will open. At the same time, the PC beam (B') is mounted on the head of the PC column (4).

In this state, insert the fixing bar (7) that passes through the tie bar (3) into the hollow part (1), and connect the end of the fixing bar (7) to the P
After joining the cut end of the beam bottom reinforcement (6) of the C beam frame by gas pressure welding or other mechanical joints as shown in (a),
Inside the cavity (1), concrete HCI (C'l) is poured integrally with the panel zone above the opening, and the PC beam is
It is firmly connected to the hollow part (1) of the C column (4), and the P is connected to the column head of the PC column □ through the panel zone concrete (C').
Together with the joining of the C beam (B'), the PC beam (B'l) with a level difference is integrally joined to the PC column (4).

(Effects of the Invention) As described above, according to the present invention, a hollow portion for connecting a PC beam with an open top surface and side surfaces is provided in the capital of a PC column, and
The reinforcement of the column is exposed in the open side part of the hollow part, and a beam support bracket is provided continuously on the lower bottom surface of the hollow part,
Cut the protruding end of the beam end surface of the beam bottom reinforcement in beam C, and
When the C-beam is mounted on the beam support bracket, the protruding end of the beam lower end reinforcement of the PC beam is prevented from interfering with the tie reinforcement of the side opening in the hollow part of the PC column. Thereafter, a fixing bar passing through the same band reinforcement was placed in the hollow part, and the fixing bar was welded to the lower end bar of the PC beam, thereby making the PC beam
The beam bottom reinforcement of the beam is set in the hollow part of the PC column, and in this state, concrete is poured into the hollow part, thereby joining the PC beam to the column capital side surface of the PC column via the hollow part. On the other hand, in conjunction with integrally joining the PC column to the column head via the concrete poured in the upper panel zone, it is possible to use the PC construction method instead of using the cast-in-place concrete construction method to construct PC beams with different levels. This allows for installation on PC columns, which simplifies on-site construction, saves labor and shortens the process, and reduces construction costs.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing a column-beam joint in a precast concrete structure constructed by the method of the present invention, Fig. 2 is a view taken along arrows ■-■ in Fig. 1, and Fig. 3 is a perspective view of a PC column. It is. □□□・・・PC pillar, (BL・・・PC
Beam, (B')...PC beam at column head, (0...Cavity concrete, (C')...Panel zone concrete, (1)...
・Cavity part, (2)...beam support bracket, (
3)...Stirrup, (6)...Beam bottom reinforcement,
(7)...Fixed reinforcement, (a)...Joint part between the lower beam reinforcement and the anchored reinforcement.

Claims (1)

[Claims] A hollow section with open top and side surfaces is provided in the capital of the PC column, a beam support bracket is provided connected to the bottom surface of the hollow section, and a tie bar is exposed at the open side section of the hollow section. After a PC beam formed by cutting the protruding end of the beam end face of the lower end reinforcement is mounted on the beam support bracket, a fixing reinforcement is provided in the hollow portion to pass through the tie reinforcement of the open side portion of the hollow portion, and A method for joining columns and beams in precast concrete construction, characterized in that the fixing reinforcement is welded to the cut portion of the beam lower end reinforcement of the PC beam, and then concrete is poured into the cavity integrally with the upper panel zone.