JPH06212690A - Jointing structure of column and beam - Google Patents

Abstract

PURPOSE:To increase the toughness at jointing part of a column with a beam, by inserting steel reinforcing members radially extending to the axial direction of the column and beams, in all recessions extending to the axial direction in precast concrete column and beams and opening at the jointed ends and then by placing concrete. CONSTITUTION:Grooved recessions 1 extending to the longitudinal direction and opened at the upper face are provided at the jointed ends of a PC girder B. Next the reinforcements 2 at the bottom of the girder B buried in the girder B are enbedded in the inside without protrusion from the girder end. And a square cylindrical recession 3 or a hollow column is formed in the inside of the PC column A. And stress and shear resistant members are protrusively provided at the end of steel plates 4 radially extending in the respective axial directions and reinforcing rods 6 at the lower end of girder are pierced in the all radial plates 4. Moreover, shear reinforcements 6 are arranged between the adjacent steel plates 4 in the cross type steel plate at the center. And after PC girders B are laid down on the head of PC column A from various directions, the reinforcing rods 6 and the steel plates 4 are arranged in the recessed grooves 1, 3 and then concrete is placed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of precast concrete columns and beams (hereinafter referred to as PC columns and PC beams).

[0002]

2. Description of the Related Art A conventional PC beam-column joint has a protrusion in the lower end main bar arranged on a column with a space between the two PC beams, and the protrusion is located in the panel zone. Then, the concrete was cast by bending so as to face each other or by superposing it in the panel zone and fixing the protruding end portion 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 and the column-beam joint is limited. In order to solve such problems,
The present inventor, in Japanese Patent Publication No. 4-48911, mounts a precast concrete beam on a precast concrete column, the precast concrete beam having a groove-shaped recess extending in the material axis direction at the joining end and opening at the material end face. Then, the reinforcing bars along the bottom main bar in the beam are overlapped with each other in the beam groove type recesses facing each other and are overlapped at an interval in the vertical direction. A column-beam joint structure was proposed in which joint concrete was placed in the joint space between the beams in, and the lap joint of the lower main rebar of the beam was configured by the vertical reinforcement.

[0004]

However, it has been impossible to obtain a strong column-beam joint structure only with the reinforcing bars of the column-beam joints as in the prior art.

The present invention has been proposed in view of the above problems of the prior art. The object of the present invention is to smoothly transmit the stress of the column-beam joint and toughness of the joint. The point is to provide improved joints between columns and beams.

[0006]

In order to achieve the above-mentioned object, the joint structure of a pillar and a beam according to the present invention has a joint portion of a precast concrete pillar and a beam which extends in the axial direction of the pillar and the beam and is joined. Across each recess that opens at the end,
A steel plate reinforcing member extending radially in the axial direction of each pillar / beam is inserted and concrete is poured.

[0007]

As described above, according to the present invention, in the beam at the column-beam joint, and in the cavity or hollow portion extending in the axial direction of the pillar, a radial steel plate reinforcement extending in the axial direction of each pillar / beam. Since the material is inserted and concrete is cast, the reinforcement steel material smoothly transmits the stress between the pillar and the beam, and improves the toughness of the joint portion between the pillar and the beam.

[0008]

The present invention will be described below with reference to the illustrated embodiments. 1 to 3, A is a PC column, B is a PC girder, and the joint end of the PC girder B extends in the longitudinal direction of the beam.
Moreover, a groove-shaped recess 1 having an open upper surface is provided, and the girder lower end main reinforcement 2 embedded in the girder lower part is stopped at the same part without protruding from the beam end part.

The PC pillar A has a hollow cylindrical hollow 3 or is formed as a hollow pillar. FIG. 3 shows a steel plate reinforcing material C, which extends radially in the axial direction of each of the pillars and beams, and at the end of each radial steel plate 4, a shear resistant material such as a stud dowel 5 is projected. Further, a girder bottom end reinforcing bar 6 is penetrated across the vertical radial steel plate 4, and a shear reinforcing bar 6 surrounding the column main bar is arranged between the adjacent steel plates 4 in the central cross-shaped steel plate portion. Has been done.

Further, instead of the stud dowel 5, a shear resistance member composed of striped projections 7 is bulged at the end of the steel plate 4. After mounting the PC girders B from the four sides on the stigmas of the PC columns A, the girder bottom end reinforcements 6 and the radial steel plates 4 are placed on the P
It is arranged in the groove type recess 1 of the C large beam B and the recess 3 of the PC pillar A,
After that, concrete is placed in the groove-shaped recess 1 and the recess 3 of the PC column A, and the column beams are integrally joined.

The vertical piece extending above the steel plate reinforcing member C is fitted into the hollow PC column A'of the upper floor and concrete is poured. Thus, the PC column and the beam are integrally joined via the steel plate reinforcing material C and the concrete, smoothing the transmission of stress between the column and the beam, and improving the toughness of the column-beam joint.

In the figure, 8 is a rib of a PC girder, and 9 is a girder upper end main bar. 4 to 8 show another embodiment of the present invention, in which a steel reinforcing member C is a biaxial type member horizontally extending in the direction of a pair of opposing beams, and both the PC beams B facing each other are provided. It is inserted into the groove-shaped recess 1 of the above, the concrete is filled, and the PC columns and beams are integrally joined.

The same parts as those in the above embodiment are designated by the same reference numerals. In the figure, 10 is the main pillar muscle, and 11 is the stirrups.

[0014]

As described above, according to the present invention, in the joint portion of the PC pillar and the beam, each of the above-mentioned recesses extending in the axial direction of the pillar and the beam and opening at the joint end is provided. Pillar
By inserting a steel plate reinforcement that extends radially in the axial direction of the beam and placing concrete, stress is smoothly transmitted between the PC column and beam, the toughness is improved, and the height of the structure is increased. Design conditions such as span and load can be made advantageous.

According to the second aspect of the present invention, by using the triaxial steel reinforcing material extending in the axial direction of the pillar / beam, the joint portion of the PC pillar / beam arranged in both horizontal and vertical directions. According to the invention of claim 3, a horizontal biaxial type steel reinforcing material is used to integrate the joint portion with the beam mounted on the top portion of the column similar to the column. The invention of claim 4 provides a shear resistance member at the end of the radial steel plate in the steel plate reinforcing member, and the invention of claim 5 provides the steel plate reinforcing member with a beam reinforcing bar at the center in the axial direction of the beam. By arranging a shear reinforcing bar that penetrates between adjacent steel plates in the cross-shaped steel plate part and surrounds the main bar of the column, a more reliable integration of the PC column and beam by the steel plate reinforcing material is achieved. Is.

[Brief description of drawings]

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

FIG. 2 is a plan view of FIG.

FIG. 3 is a perspective view of a steel plate reinforcing member.

FIG. 4 is a front view showing an end portion of a steel plate in another embodiment of the steel plate reinforcing material.

FIG. 5 is a vertical sectional view showing another embodiment of the present invention.

FIG. 6 is a plan view of FIG.

FIG. 7 is a perspective view of a steel plate reinforcing member.

FIG. 8 is a perspective view showing another embodiment of a steel plate reinforcing material.

FIG. 9 is a front view of an end portion of a steel plate of a steel plate reinforcing material.

[Explanation of symbols]

 A PC pillar A'Upper floor PC pillar B PC beam C Steel plate reinforcement 1 Groove type recess 2 Large beam lower end main bar 3 Column hollow part 4 Radial steel plate 5 Stud bell 6 Large beam lower end reinforcement 7 Shear reinforcement 8 Rib 9 Large beam top main bar 10 Column main bar 11 Belt bar

Claims (5)

[Claims] 1. A precast concrete pillar / beam joint, which extends radially in the material axis direction of each pillar / beam across each recess extending in the material axis direction of the same pillar and beam and opening at the joint end. A joint structure of columns and beams, which is characterized in that an extending steel plate reinforcement is inserted and concrete is poured. 2. In the joint portion of the pillar and the beam, a groove groove of the beam that extends in the material axis direction and is cut so as to open to the material end surface, and a corner of the column that extends in the material axis direction and opens to the material end surface A column / beam in which horizontal and vertical pieces of a triaxial steel plate reinforcing member extending in two horizontal and vertical directions that are orthogonal to each other are inserted into the tubular recess and are filled with concrete. Joint structure. 3. A reinforcing member made of a biaxial steel plate extending horizontally in the concave groove of each beam extending in the material axial direction and cut out so as to open at the material end face at the joint portion of the pillar and the beam. A joint structure of columns and beams that is made by inserting material and filling concrete. 4. The column-beam joint structure according to claim 1, wherein a shear resistance material is arranged at a tip portion of a steel plate that extends radially in the steel plate reinforcing material. 5. The steel plate reinforcing member is constructed by assembling beam reinforcing rods in the beam axial direction of the beam, and shear reinforcing rods surrounding the column main rods through the respective steel plates in the central cross-shaped steel plate portion. The column-beam joint structure according to Item 1 or 2.