JPH0673788A - Junction of pc beam in joint of pillar and beam - Google Patents

Abstract

PURPOSE:To make it possible to carry out two-step reinforcing arrangement of respective PC beams mutually crossing in right angles in the joint of a pillar and a beam. CONSTITUTION:The lowermost reinforcing rods 3, 4, 3', 4' are arranged in two-step respectively and the concrete body is not continuous in the joint with the pillar P of PC beam in one direction of the two-directional PC beams A, A' mutually crossing in right angles and a U-shaped recession 2 is provided at the end thereof respectively. The opposite right and left PC beams A, A' are connected to each other by the lowermost rods 4 of the PC beam A. The second step rod 3 above the lowermost one is protruded in the U-shaped recession at the end. In the other PC beam A' crossing in right angles with the PC beam A, the concrete body is discontinuous at the joint with the pillar P and the opposite PC right and left PC beams are connected to each other by the second step reinforcing rods 3', 4' of the bead. Moreover, joint rods 6 are previously set to cross in right angles with the first and second step rods respectively between these rods. One of PC beam A is placed on the pillar P and then the other PC beam A' is also placed. The second step reinforcing rods 3 of the PC beam A are jointed through the joint rods 6 so as to stride over the pillar P.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables a two-stage bar arrangement of the bottom main bar of each of the PC beams in both directions orthogonal to each other in a column-beam joint of a reinforced concrete structure. The present invention relates to a method of joining PC beams in a column-beam joint section.

[0002]

2. Description of the Related Art In a reinforced concrete rigid frame structure, when the beam bottom main bars of PC beams at the beam-column joints are made to have two-stage bars in both XY directions that are orthogonal to each other, the beam failure in one direction must be increased or a haunch or the like must be used. Unlike the beam in the other direction, there is a method in which the lower main bar 2 steps of the other direction PC beam are arranged on the lower two step bars of the PC beam in one direction that is set on the column first. It was taken.

[0003]

This is possible when the beam beams are different as described above, but in the case where the beam beams are the same, it has been impossible to form the lower end main bar in two steps in both XY directions. The present invention has been proposed in view of the above problems of the prior art, and an object thereof is a column-beam joint that enables two-stage bar arrangement of orthogonal PC beams even when the beam beams are the same. The point is to provide a method for joining the PC beams in the section.

[0004]

In order to achieve the above-mentioned object, according to the method of joining PC beams in a beam-column joint portion according to the present invention, each lower end bar is arranged in two steps and is orthogonal to each other. Among the two-direction PC beams, the concrete frame is discontinuous at the joint portion with the pillar of the one-direction PC beam, and the cross-sectional shape of the joint end portion with the pillar is U-shaped. The left and right PC beams that face each other are connected by the stairs,
The lower end second-stage bar of the beam has its end projecting from the U-shaped recess, and the other PC beam orthogonal to the one PC beam has a discontinuous concrete skeleton at the joint with the column. The left and right PC beams facing each other are connected by the lower end first step reinforcement and the second step reinforcement of the beam, and a joint reinforcement is preliminarily provided between the lower end first step reinforcement and the second step reinforcement orthogonal to these. Set and place one of the PC beams on a pillar, then place the other PC beam orthogonal to the same PC beam, and project into the U-shaped recess of the one PC beam. The above described lower end second step reinforcements are joined to each other by straddling the columns by the joint reinforcements provisionally set in advance on the other PC beam.

[0005]

According to the present invention, as described above, the column-joining end of the PC beam is formed in the U-shaped recess, and the left and right PC beams are connected to each other by the first step of the lower end of the beam. The PC beam is placed on the pillar, and the PC beam in the other direction, which is connected by the lower end first step bar and the second step bar of the beam, is placed on the pillar in the one direction PC.
The first step of the lower end of the beam is placed and placed.

At this time, since the second lower end second streaks of the PC beam in the one direction do not exist on the column, the PC beam in the other direction can be easily placed on the column. After that, the space between the ends of the lower end second step bar protruding in the U-shaped recess of the PC beam in the one direction is temporarily set in advance between the lower end first and second step main bars in the other direction. By joining the columns by straddling them with each other, the two-stage reinforcements of the PC beams that are orthogonal to each other in the column-beam joint can be achieved.

[0007]

1 to 3 show a first embodiment of the present invention, in which P is a concrete column (PC or cast-in-place concrete column), and A and A'are orthogonal to each other at the column head of the column P. PC beam in one direction and PC beam in the other direction to be joined,
The concrete skeleton 1 of the PC beam A is discontinuous, and the joint end portion with the pillar P is formed in the U-shaped concave portion 2, and the skeleton 1
The upper and lower two-tiered lower end bars are arranged in the upper and lower ends, the lower end second-stage bar 3 is projectingly provided in the concave portion 2, and the lower end first-stage bar 4 allows the P
The left and right concrete frames 1, 1 of the C-beam A are connected.

In the other PC beam A ', the concrete skeletons 1'adjacent to each other at the connection portion with the pillar P are discontinuous, and are connected through the lower first step bar 4 and the lower second step bar 3. There is. In the figure, 5 is a rib. Between the lower end second step reinforcement 3'and the lower end second step reinforcement 4'of the other PC beam A ', the joint reinforcement 6 is tentatively set in advance at right angles thereto.

Then, the one PC beam A is installed on the column head of the column P, the other beam A ′ orthogonal to the PC beam A is placed on the column head, and the PC beam A ′ is preliminarily preliminarily set. Set joint 6
Thus, the lower end first step streaks 4 of the opposing PC beams A ′ are joined across the pillar P. The joint bar 6 and the lower end second
The joint portion 7 with the step bar 3 is joined through enclosed welding, a sleeve joint, a lap joint or the like.

The lower end second step streaks 3 may be inserted into the U-shaped recess 2 of the PC beam in advance, or may be inserted later. Then, the beam upper end bars 8, 9 and 8 ', 9'in both directions orthogonal to each other are laid out and the panel zone and the upper end part of the beam are cast and integrated by cast-in-place concrete.

FIG. 4, FIG. 5 and FIG. 6 show a second embodiment of the present invention, in which the lower end second step streaks 3 of one of the PC beams A extend into the recess 2 and a fixing portion is provided at the end. Curved, joint 6 '
The lap joint is formed by. 7, 8 and 9 show a third embodiment of the present invention, in which the bent up portion is bent at the end of the lower end first step bar 4 protruding from the PC beam A, and the lower end first The case where the stairs 4 serve as an anchor in the panel zone is shown.

In the figure, reference numeral 10 is a main pillar bar. In each of the above-mentioned embodiments, the same parts are designated by the same reference numerals.

[0013]

As described above, according to the present invention, the PC beams which are orthogonal to each other in the column-beam joint portion can be simply arranged in two steps without changing the beam or providing a haunch. Is what makes it possible.

[Brief description of drawings]

FIG. 1 is a perspective view showing one end of a PC beam in a first embodiment of a method for joining PC beams in a beam / column connection according to the present invention.

FIG. 2 is a vertical cross-sectional view showing an implementation situation of the first embodiment.

FIG. 3 is a plan view of FIG.

FIG. 4 is a perspective view showing one PC beam end portion in the second embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing an implementation situation of the second embodiment.

FIG. 6 is a plan view of FIG.

FIG. 7 is a perspective view showing one PC beam end portion in the third embodiment of the present invention.

FIG. 8 is a vertical cross-sectional view showing an implementation status of the third embodiment.

9 is a plan view of FIG. 8. FIG.

[Explanation of symbols]

 A PC beam in one direction A'PC beam in the other direction 1 Concrete skeleton 2 U-shaped recessed part 3 Lower end second step bar 3'Lower second step bar 4 Lower end first step bar 4'Lower second step bar 5 Rib bar 6 Joint Reinforcement 6 ′ Joint Reinforcement 7 Joint 8 Beam Upper Reinforcement 9 Beam Upper Reinforcement 10 Column Main Reinforcement

Claims (1)

[Claims] 1. A concrete skeleton is discontinuous at a joint portion of a PC beam in one direction, out of PC beams in two directions in which lower end reinforcements are arranged in two steps and which are orthogonal to each other, and And the left and right PC beams are connected by the lower end first step bar of the beam, and the end of the lower end second step bar of the beam is the U-shaped recess. And the other P beam which is orthogonal to the one PC beam.
In the C-beam, the concrete frame is discontinuous at the joint with the column, and the left and right PC beams facing each other are connected by the lower end first-stage reinforcement and the second-stage reinforcement of the beam, and further the lower-end first-stage reinforcement and the second reinforcement Temporarily set joint streaks in advance orthogonal to these with step stairs, mount the one PC beam on a column, and then mount the other PC beam orthogonal to the same PC beam. The second lower-tier second ribs projecting in the U-shaped recess of one of the PC beams are joined to each other by straddling the pillars with a joint streak preliminarily set to the other PC beam. Method of joining PC beams in a pillar and beam joint.