JPS6037346A - Connection of precast concrete beam and pillar - 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 The present invention relates to a technique for rigidly joining a precast concrete beam to a concrete column by introducing prestress.

It is common practice to rigidly connect a precast concrete beam to a concrete column by introducing prestress, but in the conventional method, even if the concrete column is ready-made or cast-in-place, a sheath is buried within the concrete column and It is necessary to connect this sheath to the sheath inside the precast concrete beam to prevent concrete from entering. However, it is difficult to reliably set and connect the sheath at joints where reinforcing bars, separators, spacers, etc. are involved, and this is one problem with the conventional method.

The present invention aims to provide a method for joining precast concrete beams and columns that will solve the above problems and shorten the construction period of the entire building, and its structural features are as follows:
Place the end of the precast concrete beam on the bracket attached to the steel column, temporarily secure the precast concrete beam to prevent it from falling over, and attach the steel column to the end of the PC steel material inserted through the sheath inside the precast concrete beam. Connect the ends of the unbonded steel materials that pass through, and in this state, cast column concrete together with the floor concrete. After the column concrete has hardened to the specified strength, tension the unbonded steel materials and fix the ends to the column concrete. At the point.

Hereinafter, the present invention will be specifically explained based on one embodiment shown in the drawings.

In the figure, 1 is a precast concrete beam (hereinafter referred to as
It is called a PC beam), and inside it there are multiple sheaths 2.
are buried, and a PC steel material 3 is inserted into each of them.

Further, short T-shaped members 4 and 5 are attached to the end of the PCC 10 near the lower edge and upper edge, respectively, with their bases embedded in concrete.

On the other hand, the illustrated steel column 6 has an H-shaped (or cross-shaped, box-shaped) cross section, and a bracket 8 is attached to the surface of its inner flange 7.

In the present invention, first, the end of the PCC 10 is placed on the bracket 8 of the steel column 6, the exposed part of the T-shaped member 4 is fixed to the bracket 8, and the exposed part of the T-shaped member 5 is fixed to the T-shaped member 9. It is fixed to the inner flange 7 of the steel column 6 via.

By applying pressure in this way, the PC beam l is temporarily fixed to the steel column 6 in a stable state without falling over, and at the position M opposite to the exposed end of each PC steel member 3, the outer flange 10 and inner flange 7 of the steel column 6 are connected from the outside. Unbonded steel material 11
is inserted, and its tip is connected to the end of the PC steel material 3 via the coupler 12.

In this state, formwork assembly and reinforcement for the floor concrete and column concrete are performed, and the floor concrete 13 and column concrete 14f are poured.

After the column concrete IJ-) 14 is hardened to a predetermined strength, the unbonded steel material 11 is tensioned and its end portion is fixed to the column concrete 'J-) 14 via an appropriate fixing device 15.

In the illustrated case, the PC steel material 3 is tensioned at the PCC 10 manufacturing stage, and the sheath 3 has already been grouted. If the PC steel material 3 is also to be tensed by this tension, grout will be injected into the sheath 3 later.

The joining method of the present invention is as described above, and its advantages include the following.

By using unbonded steel for the PC steel in the column, there is no need to install a sheath in this area, so the workability of the joint is better than with the conventional method mentioned earlier, and the construction is more reliable. is also large.

Floor concrete and column concrete are poured with the ends of the PC beams temporarily secured to the steel columns to prevent them from falling over.
It is expected that the overall construction period will be shortened.

The use of unbonded steel imparts stiffness to the joint, resulting in a rigid joint that is favorable for earthquake resistance.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the end of a PC beam temporarily fixed to a steel column, and Fig. 2 is an enlarged cross-sectional view of the connection part of the PC steel material. In the figure, l...PC beam, 2...sheath, 3...PC
Steel material, 6... Steel column, 11... Unbonded steel material,
・・・・・・． Patent applicant: Hiroshi Sometani, patent attorney representing 7Do Kenken Co., Ltd.

Claims (1)

[Claims] Place the end of the precast concrete beam on the bracket attached to the steel column and temporarily secure the precast concrete beam so that it does not fall over. Connect the ends of the unbonded steel that penetrate through the column, and in this state, cast the column concrete together with the floor concrete. After the column concrete has hardened to the specified strength, tension the unbonded steel and fix the end to the column concrete. A method for joining precast concrete beams and columns.