JPS6321774B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a construction method for column and beam joints in the reinforcing bar construction method, and aims to improve workability by eliminating the complexity of reinforcing reinforcement at joints unique to RC construction. At the same time, the purpose is to securely restrain the concrete at the joint, suppress diagonal tension cracks in the concrete at the joint caused by alternating loads during an earthquake, and obtain a highly rigid joint. .

Column and beam joints in the reinforcing bar pre-assembly method use, for example, threaded cylindrical couplers and lock nuts at one end of pre-assembled beam bars whose main reinforcement is threaded reinforcing bars, and mechanical (crimping) joints at the other end. such as
Various methods have been used to construct the reinforcement, but the hoop reinforcement of the preassembled column reinforcement tends to result in overcrowded reinforcement, and the crimping jig must be operated in a narrow space, resulting in problems in construction. In addition, the overcrowded reinforcement made it difficult to place concrete uniformly, resulting in poor rigidity at the joints.

The present invention solves these problems.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a steel plate joint part reinforcement body A used in the construction method of column and beam joint parts in the pre-assembled reinforcing bar construction method according to the present invention. As shown in the figure, this reinforcing body A has a rectangular cylindrical plate portion 1 and a cross section approximately L extending from its four corners.
It is composed of a main body A ₁ consisting of a shaped rising plate portion 2 , and four plates A ₂ connected between the upper ends of the rising portion 2 with bolts and nuts. Further, bolt insertion holes 3 are provided at the upper end of each rising plate portion 2, and bolt insertion holes 3 and reinforcing bar insertion holes 4 are provided at both ends of the plate _A2 .

Fig. 2 shows a state in which the pre-assembled beam reinforcements C are installed between the pre-assembled column reinforcements B, and the column and beam joints are constructed as follows.

That is, as shown in FIGS. 3 to 5, the main body _A1 of the reinforcing body A is placed at a predetermined position of the previously assembled column reinforcement B,
It is fixed in advance so as to surround the outer periphery of the main column reinforcements 5. This fixation is carried out, for example, by bringing the column main reinforcing bars 5 into contact with the corners of the rectangular cylindrical plate part 1 and the rising plate part 2, and by flare welding them together. on the other hand,
The plates A ₂ are fixed in advance to the ends of the upper main reinforcements 6a of the pre-assembled beam reinforcements C by means such as welding. 7... is a deformation prevention plate welded to the vicinity of both ends of the pre-assembled beam reinforcement C, 8... is a through bar that is slidably tied to the upper main reinforcement 6a... and lower main reinforcement 6b with a wire, and 9... is a column main reinforcement. This is a sleeve for a crimp joint fixed to the end of B. Reference numeral 10 indicates a hoop muscle, and reference numeral 11 indicates a stirrup. For example, spiral muscles are used for these 10 and 11.

Note that the hoop reinforcements 10 are not arranged at the mounting position of the main body _A1 and above it.

After the pre-assembled column reinforcements B... are erected, the pre-assembled beam reinforcements C are suspended between the pre-assembled column reinforcements B... using a lifting machine such as a Retsuker, and both ends of the pre-assembled beam reinforcements C are attached to the main body. Insert the plate A 2 from above into the opening S formed between the rising plate part 2 of A ₁ and fix the plate A ₂ to the upper end of the rising plate part 2 with bolts and nuts a. (or prior to this) pull out the through reinforcements 8... and place the pre-assembled beam reinforcements C... located opposite to each other on both sides of the pre-assembled column reinforcements B (i.e., the previously assembled beam reinforcements C and the later Upper main reinforcement 6a of the pre-erected beam reinforcement C)
...and the lower main reinforcement 6b...the through-reinforcement 8...
The connection is made via an appropriate joint (for example, a lap joint).

The upper main reinforcement 6a and the lower main reinforcement 6b may be threaded reinforcing bars or normal deformed reinforcing bars.

The present invention has the above-mentioned configuration, in which the main body of the steel plate joint reinforcing body is fixed at a predetermined position of the pre-assembled column reinforcement, and a part of the reinforcement body is attached to the upper main reinforcement of the pre-assembled beam reinforcement. Attach the plate that will become the main body, insert the end of the pre-assembled beam reinforcement from above into the opening formed between the rising plate parts of the main body, connect the plate and the rising plate part, arrange the reinforcement, etc. Therefore, the hoop reinforcement of the column at the joint part is omitted, the complexity of the reinforcement work is eliminated, and the workability can be improved.

However, in the joint part, the four corners of the upper and lower rectangular cylindrical plates are shaped into a roughly L-shaped cross section by the main body surrounding the outer periphery of the column main reinforcement and the plate fixed between the upper ends of the rising plate parts. A reinforcing body with a shape that is rigidly connected at the rising plate part is constructed, and the concrete and main reinforcement of the column at the joint part can be reliably restrained by the plate surface of the reinforcement body, so that the joint part is not affected by alternating loads during an earthquake. The occurrence of diagonal tension cracks can be suppressed, and a highly rigid joint can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of a steel plate joint reinforcing body, FIG. 2 is a schematic front view showing the installed state, FIG. 3 is a perspective view of the main part, and FIG. 4 is a longitudinal sectional front view of the main part, and FIG. 5 is a sectional front view of the main part. A...Steel plate joint reinforcement, _A1 ...Main body, _A2 ...Plate, B...Pre-assembled column reinforcement, C...Pre-assembled beam reinforcement, S...Opening, 1...Square cylindrical plate, 2...Rise Plate part, 5...Column main reinforcement, 6a...Upper main reinforcement, 6b...Lower main reinforcement, 8...Through bar.

Claims (1)

[Claims] 1. Made of steel plate, consisting of a main body consisting of a rectangular cylindrical plate part and a rising plate part having an approximately L-shaped cross section rising from its four corners, and a plate connected between the upper ends of the rising plate part. The main body of the joint part reinforcement body is fixed to a predetermined position of the pre-assembled column reinforcement in a state surrounding the outer periphery of the column main reinforcement, while the plate is fixed to the end of the upper main reinforcement of the pre-assembled beam reinforcement. , inserting the ends of the pre-assembled beam reinforcements from above into the openings formed between the rising plate parts of the main body, and fixing both ends of the plates to the upper ends of the rising plate parts,
A column in the reinforcing bar pre-assembled construction method, which is characterized in that the upper main reinforcements and the lower main reinforcements of the pre-assembled beam bars located opposite to each other on both sides of the pre-assembled column reinforcements are connected by appropriate joints via through reinforcements. Construction method for beam joints.