JPH0358613B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] Industrial Application Field The present invention relates to a method for rigidly joining a beam such as a prestressed beam or a cast-in-place beam to a prestressed slab.

Conventional technology Conventionally, as shown in Fig. 5, the conventional method for joining a beam and a PC slab is to erect a half-PC slab on the beam and arrange the required reinforcement at the joint and on the upper surface of the half-PC slab. After that, top concrete was poured on-site, or as shown in Figure 6, PC slabs were erected on top of the beams and the gaps between the joints were filled with mortar.

Problems to be Solved by the Invention However, in the conventional example shown in FIG.
Although the beam and slab are rigidly connected, it requires work such as placing reinforcement on the semi-PC slab and placing top concrete, which increases the construction period and cost. Although the conventional example shown in Figure 6 has been streamlined in terms of construction methods, it has problems such as the beam width not being sufficient and the beam and slab being connected by pins, which is structurally insufficient. It was hot.

The present invention was made in order to solve the above-mentioned conventional problems, and its purpose is to achieve economical rigid joints of beams and PC slabs that are excellent in workability and can shorten the construction period. The purpose is to provide a method.

[Structure of the Invention] Means for Solving the Problems The method for rigidly joining beams and PC slabs of the present invention is based on the PC
In the method of joining a beam, such as a beam or a beam cast on site, with a PC slab, loop reinforcements, which are oriented vertically and protrude from the joint end face of the PC slab built on the beam, are overlapped from the left and right at the joint part, and , inserting and arranging the upper end beam main reinforcement of the beam so as to intersect the loop reinforcement inside the superimposed loop reinforcement,
It is characterized in that joint concrete is poured into the joint portion to form an integral joint.

In addition, the method for rigidly joining a beam and a PC slab according to another invention of the present application is a method for joining a PC beam and a PC slab, such as a PC beam or a cast-in-place beam, in a horizontal direction from the joint end surface of a PC slab built on the beam. The oriented and protruding loop reinforcements are overlapped from the left and right at the joint, and the exposed upper end of the stirrup of the beam is inserted so as to intersect the loop reinforcement inside the overlapped loop reinforcement. , is characterized in that joint concrete is cast in the joint portion to integrally join the joint.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, 1 is a reinforced concrete beam, which may be either a prestressed beam or a cast-in-place beam. Beam 1 to be connected to slab
The upper end of the stirrup 2 is exposed at the joint.

The PC slab 3 is erected on both side shoulders 1a of the beam 1 with the joint end portions 3a of the PC slab 3 placed thereon. Incidentally, a shear connector 3b is formed on the end surface of the joint end portion 3a of the PC slab 3, if necessary.

In addition, at the joint end 3a of the PC slab 3,
Loop reinforcements 4 are provided protrudingly oriented in the vertical direction (slab thickness direction) at appropriate intervals. Loop reinforcements 4 protruding from the left and right PC slabs 3, 3 are arranged in an overlapping state at the joint on the beam 1.

These loop strips 4 may be placed one on top of the other in contact as shown in FIG. 1, or may be arranged with a certain distance between them. In other words, they may be arranged in parallel between the stirrups 2 exposed at the joint. It would be good if it was done.

5 is the upper end beam main reinforcement, and the above stirrup 2
Several reinforcements (three in this embodiment) are arranged inside the loop reinforcement 4 in a perpendicular state. Also loop muscle 4
Reinforcing bars 6 are placed inside the tip of the bar.

As shown above, loop reinforcement 4 and beam 1 of PC slab 3
After assembling the stirrups 2, upper end beam main reinforcements 5, etc., joint concrete C is placed at the joints to complete the joint work.

Figures 3 and 4 show another example in which the loop reinforcements 4 are oriented in the horizontal direction (parallel to the slab surface), and in this case, they are stacked vertically from the left and right PC slabs 3. The stirrup 2 is assembled with the exposed upper end part inserted into the loop reinforcement 4, and then the upper end beam main reinforcement 5 is arranged and the joint concrete C is poured.

[Effects of the invention] (1) All PC slabs can be rigidly joined, so
Effective composite beams can be easily constructed, making it possible to reduce the beam height and, as a result, to keep the overall height of the building low.

(2) The use of PC boards improves workability, shortens the construction period and reduces construction costs, making it an economical construction method.

(3) Depending on the beam width and the way the cantilever slab comes out, it can also be applied to rigid joining of PC canceller slabs.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of a beam-slab rigid joint structure according to the construction method of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is another embodiment of the present invention. FIG. 4 is a sectional view taken along the - line in FIG. 3, and FIGS. 5 and 6 are sectional views taken by the conventional method. 1...beam, 1a...shoulder, 2...stirrup, 3...PC slab, 3a...joint end, 3b
...Shiakotta, 4...Loop bar, 5...Top beam main bar, 6...Reinforcement bar.

Claims (1)

[Claims] 1. In a method of joining a PC slab to a beam such as a PC beam or a beam cast on site, loop reinforcements are provided that are oriented vertically and protrude from the joint end surface of the PC slab built on the beam. As well as overlapping from left and right at the joint,
The main beam reinforcement at the upper end of the beam is inserted and arranged so as to intersect with the loop reinforcement inside the overlapped loop reinforcement, and joint concrete is poured into the joint part to integrally join the reinforcement. Rigid joining method for beams and PC slabs. 2. In the method of joining PC beams or beams cast on site, etc., with PC slabs, loop reinforcements, which are oriented horizontally and protrude from the joint end faces of PC slabs built on the beams, are overlapped from the left and right at the joint. At the same time, insert the exposed upper end of the stirrup of the beam so that it intersects with the loop reinforcement inside the overlapped loop reinforcement, and place reinforcement, and pour joint concrete into the joint part to make an integral connection. A method for rigidly joining beams and PC slabs.