JPH04254643A - Structure joining joist slab with beam - Google Patents

Abstract

PURPOSE:To enhance construction performance and to form a joint high in reliability in connecting a beam with a joist slab by simplifying a way how to combine the beam with the joist slab. CONSTITUTION:Each rib 2 which is fitted vertically onto the lower surface of a thin floor plate 1, is cut off at its end section in the longer direction so as to be mounted. Furthermore, a thick floor plate section which is formed in such a way that the floor plate 1 is formed with a haunch section 3, is rested on beams B and C so as to be integrated with post-cast concrete 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a precast joist slab and a beam.

0002

2. Description of the Related Art FIG. 10 shows a conventional precast joist slab, which is formed into a double T-shaped cross section with ribs b hanging vertically along the longitudinal direction on the lower surface of a thin floor plate a. The end of the joint slab was fitted into a double T-shaped recess provided at the joint of the joint slab of the joint slab, and the slab and the beam were integrated with post-cast concrete c.

0003

[Problems to be Solved by the Invention] In the above-mentioned conventional joint structure, since the beam joint portion of the joint slab is formed in a double T-shaped cross section, in order to fix the end of the joint slab, the beam portion Manufacturing and construction were complicated because a double T-shaped notch was provided in the top. The present invention was proposed in view of the problems of the prior art described above, and its purpose is to simplify the connection between the joint slab and the beam, improve workability, and achieve high structural reliability. The point is that it provides a joint structure between a joystick slab and a beam.

0004

[Means for Solving the Problems] In order to achieve the above-mentioned object, a joint structure of a joint slab and a beam according to the present invention has the following features:
A thick floor plate section is formed by cutting out the ribs at the longitudinal ends of a joint slab in which ribs are vertically provided on the lower surface of the thin floor plate, and providing haunches in the thin floor plate at the same portions. However, the same thick floorboards are mounted on beams and integrally joined via post-cast concrete.

[0005]

[Operation] According to the present invention, as described above, the ribs at the longitudinal ends of the joystick slab are cut out, and
By providing a haunch part in the floorboard part in the same part,
A thick floor plate portion is formed at the beam joint end of the above-mentioned joystone slab without changing the rigidity of the slab much, and the thick floor plate portion is simply placed on the beam and post-cast concrete is poured. With this structure, the thick floor plate part resting on the beam increases the degree of fixation of the end of the joist slab to the beam, and improves the transmission of stress.

[0006]

[Embodiment] A is a precast joist slab, in which two ribs 2 are vertically provided on the lower surface of a thin floor plate 1 along the longitudinal direction, and the ribs 2 are provided at the ends of the joist slab A in the longitudinal direction.
is cut out, and a haunch portion 3 is provided on the floorboard 1 at the end in the longitudinal direction.
A thick floor plate portion is formed at the joint end to the beam.

B is a steel beam with an H-shaped cross section. On the upper flange of the steel beam B, the thick floor plate part of the joystick slab A is placed, and post-cast concrete 4 is poured. Beam B and joint slab A are joined together. As mentioned above, in the illustrated embodiment, the beam joint end of the joint slab A mounted on the steel beam B is formed in the thick floor plate part, so that the degree of fixation to the beam B is high and the stress is reduced. communication becomes better. Furthermore, since all construction work can be done from above, work efficiency is significantly improved.

[0008] Furthermore, in the portion of the joint slab A where the rib 2 is located, an end rib 5 is provided that protrudes from the end of the thin floor plate 1 to the upper part of the steel beam B and extends to the center of the flange to reduce the bending moment due to torsion. do. Also, steel beam B
A stud 6 is installed on the flange of the stud 6 to increase the fixing force to the post-cast concrete 4. Figures 8 and 9 show an example in which the present invention is applied to joining an RC beam C and a joint slab A, and the RC beam C has the thickness of the post-cast concrete slab cut out from the beam structure. After placing the thick floor plate part of the joint slab A on section 7 and arranging the reinforcing bars for the post-cast slab, pour the post-cast concrete 4 to integrate the RC beam and the joint slab A. It is to be joined to.

[0009]

According to the present invention, as described above, the ribs are cut out at the longitudinal ends of the joint slab in which the ribs are vertically provided on the lower surface of the thin floorboard, and the By placing the thick floor plate formed by providing corbels on the thin floor plate and placing it on the beam and integrating it with post-cast concrete, the degree of fixation of the joint slab to the beam is increased, and the transmission of stress is improved. As a result, a structurally reliable joint structure between the joint slab and the beam is constructed, and all construction is performed from above, which improves workability.

[0010] Furthermore, when the beam is composed of an RC beam,
It is no longer necessary to provide a notch with a complicated shape as in the conventional method at the joint part of the beam with the joint slab, which simplifies manufacturing and construction.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a joint structure of a joint slab and a beam according to the present invention.

FIG. 2 is a diagram taken along the arrow A--A in FIG. 1;

FIG. 3 is a rolling diagram in the direction of the arrows in FIG. 1;

FIG. 4 is a partially cutaway perspective view of the post-cast concrete of the joystone slab used in the present invention.

FIG. 5 is a side view of the joystick slab.

6 is a sectional view taken along the arrows in FIG. 5; FIG.

FIG. 7 is a knee-to-knee view in the direction of the arrows in FIG. 5;

FIG. 8 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 9 is a diagram showing the arrows in FIG. 8;

FIG. 10 is a perspective view showing a part of post-cast concrete of a conventional joint slab section with a portion cut away.

[Explanation of symbols]

A Joist slab B Steel beam C RC beam 1 Thin floorboard 2 Ribs 3 Haunch part 4 Post-cast concrete

Claims (1)

[Claims] Claim 1: In a joint slab in which ribs are vertically provided on the lower surface of a thin floor plate, the ribs are cut out at the longitudinal ends, and a haunch portion is provided on the thin floor plate at the same portion to increase the thickness. A joint structure of a joint slab and a beam, characterized in that a thick floor plate part is formed, the same thick floor plate part is mounted on a beam, and is integrally joined via post-cast concrete.