JPS5947779B2 - Column and beam joining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of easily and reliably joining columns and beam reinforcing bars with sleeves without applying bending stress to reinforcing bars during crimping. A precast concrete beam member with horizontally protruding bars and main reinforcement protruding from the end face is suspended between column members, then a threaded groove is formed on the inner surface of one end, and the sleeve is thin in the center and thick in the other end. Screw the above-mentioned threaded steel rod into the threaded groove of the sleeve, insert the main beam reinforcement into the remaining space inside the sleeve, and then squeeze and crimp the sleeve to the main beam reinforcement using a suppression device installed on the side of the column member. It is characterized by:

Conventionally, there is a method for horizontally joining precast concrete column members and beam members by using a reinforcing bar joint sleeve and joining them to the reinforcing bars by screws or by pressure. The position of the reinforcing bars must be matched accurately, which is extremely troublesome during construction. In addition, with the crimp joint method, the ends of the reinforcing bars of both columns and beams are inserted into the sleeve, and the sleeve is aligned perpendicular to the reinforcing bars using hydraulic jacks. Because it is pressed, bending stress is applied to the reinforcing bars during crimping, which could cause cracks in the concrete.

The present invention solves the above-mentioned disadvantages, and embodiments will now be described with reference to the drawings.

As shown in Fig. 1, precast concrete columns 1 with horizontally protruding screw reinforcing bars 2 embedded therein are built in predetermined positions, and precast concrete beams 3 with main reinforcements 4 protruding from both ends are suspended between the columns 1. , substantially engage the mutual reinforcing bar positions.

Next, as shown in FIG. 2, a thread groove 6 is formed on the inner surface of the end 1 at approximately 100 mm of the total length, and the center section 100 is left thin and the center section 100 is thickly formed using the sleeve 5 to tighten the threads of the column 1. The steel rod 2 is screwed into the screw groove 6, and the protruding main reinforcement 4 of the beam 3 is inserted into the remaining space of the sleeve 5.

Incidentally, as a procedure, the main reinforcement 4 may be inserted into the sleeve 5 in advance before suspending the beam.

In this state, the sleeve 5 is squeezed in the axial direction of the beam main reinforcement 4 using a pressing device consisting of the tapered fastener 7 and the hydraulic jack 8 while taking the reaction force of the hydraulic jack 8 to the side of the column 1. Press the thick part of the sleeve 5 into the main beam reinforcement 4.
Crimp and join.

In this case, even if the reinforcing bars between the column and the beam are slightly misaligned, only the thin central part of the sleeve 5 is bent and deformed, and no bending stress is applied to the reinforcing bar body.

As shown in Figure 3, the columns and beam reinforcing bars are joined, then reinforced with stirrup bars, and concrete is placed in the clearances between the members to complete the rigid frame structure.

Although this invention is intended for joining columns and beams, it can also be applied to the horizontal joining of beams that are fixedly installed horizontally relative to columns as shown in FIG.

As described above, the method of joining columns and beams according to the present invention can be applied without applying bending stress to the reinforcing bars, etc., and even if there is some misalignment between the reinforcing bars when crimping the sleeves to the reinforcing bars. This allows you to easily and reliably connect the reinforcing bars of columns and beams.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the method for joining columns and beams according to the present invention, FIGS. 2 and 3 are sectional views of the same, and FIG. 4 is a perspective view of another embodiment. 1... Precast concrete column member, 2.
...Threaded steel rod, 3...Precast concrete beam □ member, 4...Main reinforcement, 5...
・Sleeve, 6...Thread groove, 7...Tightening tool, 8..."...Hydraulic jack.

Claims (1)

[Claims] 1 After suspending a precast concrete beam member with a threaded steel rod horizontally protruding from the side surface of the precast concrete column member and a main reinforcement protruding from the end face between the column members,
The above-mentioned threaded steel rod is screwed into the threaded groove of the sleeve, which has a threaded groove formed on the inner surface of one end, a thinner wall at the center and a thicker wall at the other end, and the main beam reinforcement is inserted into the remaining space inside the sleeve. , a method for joining columns and beams, characterized in that a sleeve is squeezed and crimped to the beam main reinforcement using a pressing device installed on the side of the column member.