JPH0351849B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a column/beam joint structure using precast members (PC members) and a construction method thereof.

(Prior Art) As a conventional column-beam joint structure using PC members, there is, for example, one described in Japanese Patent Application Laid-Open No. 55-36515. In this joint structure, a horizontally protruding screw reinforced steel rod is embedded in advance in a PC column (precast concrete column), and the end of the steel rod is made to protrude from the side of the column. In this method, the end of the main reinforcement embedded in the beam is made to protrude from the end face, and the protruding end of the steel bar of the column and the protruding end of the beam main reinforcement are connected using a sleeve, and the area around the joint is It was reinforced with stirrups. And this joining method is
After suspending a PC beam between the columns, one end of the sleeve is screwed to the end of a threaded steel rod that protrudes horizontally from the side of the PC column, and the other end of the sleeve is attached to the beam that protrudes from the end face of the PC beam. The steel rod and the beam main reinforcement were connected to each other by crimping the main reinforcement using a tightening tool, and then stirrups were arranged around the joint and concrete was poured.

(Problems to be solved by the invention) According to the conventional example, the unit weight of the PC member increases,
As a result, the lifting machines have become larger, and because the steel rods that protrude from the sides of the columns are embedded in advance, it takes time to manufacture the columns, and the protruding ends of the steel rods become obstacles during transportation and assembly. The drawback was that it was difficult to transport and assemble. Furthermore, since the steel rods and the beam main bars were joined while the PC beam was still suspended, assembly work was time-consuming and the construction work could not be carried out quickly. Furthermore, since the joining method is by means of a sleeve, a sleeve is required, and a tightening tool for the sleeve must also be prepared, which leads to higher costs.

An object of the present invention is to reduce the unit weight of the constituent members, so that the joining work can be performed simply and quickly, and the construction cost can be kept low.

(Means for Solving the Problems) The joint structure of the present invention is a joint structure between a PC column and a PC beam. In the above PC pillar 1, at its head,
A notch 12 is formed on which the end of the PC beam 2 is placed, and a plurality of reinforcing bars 13 for joints are formed in this notch, the ends of which are exposed. A joint reinforcing bar 3 that can be inserted and removed is inserted into the reinforcing bar insertion hole. In the above-mentioned PC beam, the main body is a beam formwork with a U-shaped cross section, beam reinforcements 22 are arranged inside the beam formwork, and the ends of the beam formwork are connected to the above-mentioned notch. The beam reinforcement is connected to the reinforcing steel for the joint.

In addition, the construction method of the joint structure of the present invention is to first erect a PC column 1, and then insert a U-shaped cross section that constitutes the main body of the PC beam 2 into the notch 12 formed at the head of the PC column. Place and support the end of the beam formwork, and
Insert the joint reinforcing bars 3 into a plurality of joint reinforcing holes 13 whose ends are exposed in the notch of the PC column,
This joint reinforcing bar is connected to the beam reinforcing bar 22 set inside the beam formwork 21 of the PC beam 2 by a lap joint, and then concrete is poured.

(Function) Since the end of the beam formwork of the PC beam 2 can be placed and supported in the notch 12 of the head of the PC column 1, the PC column also serves as support for the beam when the beam form is set. become. There is no protrusion from the side of the head of the PC column 1 until the PC beam 2 is suspended, and the column can be transported and assembled smoothly. Since the joint reinforcing bars 3 and the beam bars 22 are joined by a lap joint, no parts are required for joining the two.

(Example) Examples of the present invention will be described below with reference to the drawings.

The columns and beams are both a PC column 1 and a PC beam 2. First, the specific structure of the PC column will be explained.

As shown in FIGS. 1 and 2, the PC column 1 is a square column, and has a hollow portion 1 at its axial center over the entire length.
1 is formed. A groove-shaped notch 12 for receiving the beam is formed oppositely on each side of the head of the PC column 1, and the PC beam 2
The end of the beam formwork can be dropped into the mounting part 12.
1 can support the end of the beam formwork. Joint reinforcing bar insertion holes 13 penetrate through the head of the PC column 1 with their positions shifted vertically in the left-right and up-down directions in FIG. exposed. In the illustrated example, the reinforcing bar insertion hole 13 for the joint is constituted by a sleeve provided with a thread on the inner circumferential surface. A reinforcing bar 3 for a joint is screwed into each reinforcing bar insertion hole 13 for a joint, as shown in FIGS. 3 and 4, and the reinforcing bar for a joint passes through the head of the PC column 1. 14 is the main column reinforcement.

The main body of the PC beam 2 is composed of a beam formwork having a U-shaped cross section, and assembly beam reinforcing bars 22 are housed inside the beam form. Assembly reinforcing bar 22
The lower end reinforcing bars 221 are mutually connected to the ends of the joint reinforcing bars 3 by lap joints. Similarly, upper end muscle 2
22, the lower two-stage reinforcement 223 is also connected to the joint reinforcing bars 3a, 3b above the head of the PC column 1 by a lap joint.

Next, the construction method for the joint structure will be explained.

First, as shown in Figure 5, build PC columns 1 one after another.
Fix the PC column with a diagonal support S to prevent it from falling and maintain vertical accuracy. Next, the assembly beam reinforcing bars 22 are set inside the beam formwork 21 of the PC beam.
Lift the PC beam 2 with a crane, suspend it between the PC columns 1, drop the end of the beam formwork through the upper opening of the notch 12, and set it on the mounting section 121 (see the chain line in Figure 5). (Illustrated). Then, the joint reinforcing bar 3 is screwed into the joint reinforcing bar insertion hole 13 in the head of the PC column 1, passing through the PC column head, and the end side is connected to the beam main bar 221 of the assembled beam reinforcing bar 22 by a lap joint. 2-step muscle 2
22, 223, are lap-joined with joint reinforcing bars 3a, 3b. Thereafter, after laying slab members such as deck plates and PC floorboards, concrete is poured into the hollow portion 11 of the PC column 1 and the inside 21 of the beam formwork of the PC beam 2 at the same time as slab concrete.

In the joint structure of the present invention, the method of joining the joint reinforcing bars 3 and the beam reinforcing bars 22 is not limited to the method using lap joints.

(Effects of the Invention) According to the present invention, since the reinforcing bars of the PC column do not protrude from the side, the PC column is easy to manufacture and transport.
Since a notch is provided in the head of the PC column to receive the beam, setting the beam can be done quickly and easily without any hassle, and in addition, the column and beam can be connected using a sleeve as in the conventional method. This eliminates the need for sleeves as special parts and fasteners as assembly tools, which improves workability, contributes to cost reduction, and also reduces the unit weight of the beam, preventing the lifting machine from becoming larger. By making the axial center of the PC column hollow, it is possible to further reduce the weight of the member.

[Brief explanation of drawings]

Figure 1 is a perspective view of the main parts, Figure 2 is Figure 1-
FIG. 3 is a partially sectional front view, FIG. 4 is a cross-sectional view taken along lines taken from FIG. 3, and FIG. 5 is an explanatory view showing one step of construction. 1...PC column, 11...Hollow part, 12...Notch part, 13...Reinforcing bar insertion hole for joint, 2...PC
Beam, 21...Inside of beam formwork, 22...Beam reinforcement (assembly beam reinforcement), 3...Reinforcement bar for joint.

Claims (1)

[Claims] 1. A joint structure between a PC column and a PC beam, wherein a notch is formed in the head of the PC column on which the end of the PC beam is placed, and the notch is A plurality of joint reinforcing bars with exposed ends are formed in the recessed part, and a removable joint reinforcing bar is inserted into each joint reinforcing bar insertion hole. It is composed of a beam formwork with a U-shaped cross section, and beam reinforcement is arranged inside this beam formwork, and the end of the beam formwork is placed in the above-mentioned notch, and the above-mentioned A column/beam joint structure characterized in that the beam reinforcement is connected to the above-mentioned joint reinforcement. 2. The column-beam joint structure according to claim 1, wherein the PC column has a hollow axial portion. 3 First, erect a PC column, then place and support the end of the beam formwork with a U-shaped cross section that constitutes the main body of the PC beam in the notch formed in the head of this PC column,
Insert reinforcing bars for joints into the multiple reinforcing bars for joints whose ends are exposed in the notches of the above-mentioned PC columns, and overlap the reinforcing bars for joints with the beam bars set inside the beam formwork. A construction method for a jointed structure of columns and beams, which is characterized by joining with joints and then pouring concrete.