JPH0656209U - Joint structure of columns and beams - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a column-beam joint structure in which the reinforcement is simplified and the proof stress of the beam joint is improved. A reinforcing bar 3 extending in the material axis direction is provided at each joining end portion of the opposing PC beams B joined to the PC pillar A, extending in the material axis direction, and extending in the material axis direction over a groove-shaped recess 1 opening at the joining end surface. An X-shaped reinforcing bar 4 is arranged which crosses a pair of rebars that extend along the groove-shaped recess 1 of each beam B and extend along the upper end of the other beam B beyond the panel zone. Then, concrete is placed in the joint space.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint structure of precast concrete columns and beams (hereinafter referred to as PC columns and PC beams).

[0002]

[Prior art]

 In the conventional PC column-beam joint, the protrusions of the bottom main bars arranged on a pair of PC beams mounted at intervals on the column should face each other at intervals in the panel zone. Concrete was cast by bending it or polymerizing it in the panel zone, and the protruding end was fixed in the cast concrete.

However, in this joint structure, the amount of reinforcement of the main beam of the girder is restricted, and the proof strength of the girder end, column and beam joint is limited. In order to solve such a problem, the present inventor has disclosed in Japanese Patent Publication No. 4-48911 a groove-shaped recess a extending in the material axial direction at the joining end and opening at the material end face. The precast concrete beam b is placed on the precast concrete column c, and the reinforcing bar e along the lower main bar d in the beam is vertically spaced between the facing groove groove type recesses a. Of the beams, and by arranging them so that they cross each other at the center of the column, concrete is placed in the joint space between each beam on the column, and the lap joint of the lower main bar of the beam is constructed by the above-mentioned upward and downward reinforcement. We proposed a column-beam connection structure. (See FIGS. 2 and 3)

[0004]

[Problems to be solved by the device]

 In the column-beam joint structure as in the prior art, since the girder main bars are arranged so as to be displaced from each other, the number of girder main bars arranged is limited, and the yield strength of the girder ends and the column-beam joints is also limited. . The present invention has been proposed in view of the above problems of the prior art. The purpose of the present invention is to simplify the bar arrangement of the column-beam joint and to improve the proof stress of the joint. The point is to provide a column-beam joint structure.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the joint structure of columns and beams according to the present invention extends in the material axial direction at each joint end of precast concrete beams facing each other across the same column joined to the precast concrete columns. The groove-shaped recess opening on the joint end face was omitted, and a reinforcing bar extending in the material axis direction was provided over the groove-shaped recess of each beam described above, and extended along the groove-shaped recess of one beam described above. An X-shaped reinforcing bar consisting of a pair of reinforcing bars that extends along the upper end of the other beam across the panel zone is placed, and the joint space is filled with concrete.

[0006]

[Action]

 According to the present invention, the reinforcing bars arranged across the end groove-shaped recesses of the beams facing each other across the column simplifies the bar arrangement by overlapping the main bars of the beams, and The X-shaped reinforcing bar arranged over the bridge overlaps the lower main bar and the upper main bar of the opposing beam, improving the bending strength of the beam end and improving the shear strength of the column-beam joint. To be

[0007]

【Example】

 Hereinafter, the present invention will be described with reference to the illustrated embodiments. A is a PC pillar and B is a PC beam. A groove-shaped recess 1 extending in the material axis direction and opening at the material end is cut at each joint end of the PC beams B facing each other with the PC pillar A interposed therebetween. In the figure, 2 is the main bar at the lower end of the beam.

Reinforcing bars 3 extending in the material axis direction are arranged across the groove-shaped recesses 1 of the PC beams B facing each other, and extend along the groove-shaped recesses 1 of the beam B, and beyond the panel zone. An X-shaped reinforcing bar 4 is provided in which a pair of reinforcing bars extending obliquely upward and extending along the upper end of the opposite beam B are crossed in a panel zone. In the figure, 5 is the ribs of the beam B, 6 is the main columnar bar, and 7 is the stirrup.

After the reinforcement of each of the reinforcing bars is completed, the pillars and beams are integrally joined by pouring concrete into the groove-shaped recess 1 and the upper part of the beam.

[0010]

[Effect of device]

 According to the present invention, as described above, by arranging a groove-shaped recess in the joint end face of the PC beam and superposing the PC beam by the reinforcing bar arranged in the recess, the bar-column joint is reinforced. It is simplified and the bending strength of the beam end can be increased by increasing the reinforcement.

Further, the X-shaped reinforcing bars arranged at the column / beam joints cause the lower end main bars and the upper end main bars of the opposing PC beams to overlap with each other, and the bending strength of the beam ends is generally improved. At the same time, the joints between columns and beams will be improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a column-beam joint structure according to the present invention.

FIG. 2 is a plan sectional view showing a conventional structure.

FIG. 3 is a vertical sectional view of a conventional structure.

[Explanation of symbols]

 A PC column B PC beam 1 Groove type recess 2 Beam bottom main bar 3 Addendum 4 X-shaped reinforcing bar 5 Rib bar 6 Column main bar 7 Belt bar

Claims (1)

[Scope of utility model registration request] 1. A groove-shaped recess extending in the axial direction of the material and opening at the joint end face is formed in each joint end of the precast concrete beams that are opposed to each other with the pillar being joined to the precast concrete pillar, and A reinforcing bar extending in the material axis direction is provided across the groove-shaped recess of the beam, and extends along the groove-shaped recess of one of the beams, and extends along the upper end of the other beam beyond the panel zone. A column-beam joint structure characterized by arranging X-shaped reinforcing bars made of steel rebar and filling the joint space with concrete.