JPH0444542A - Column and beam connecting work in precast reinforced concrete structure - Google Patents

Abstract

PURPOSE:To place Y-directed beams on the top of column without trouble by a method in which the lower end one-stage beam and lower end two-stage beams of Y-directed beams of two upper and lower stages are lapped crossingly on the lower end one-stage beam of X-directed beams. CONSTITUTION:A given number of lower end two-stage beams 3 are movably set on the groove bottom of X-directed beams 1, and the ends of the beams 1 are placed on the tops of precast or in-situ cast concrete columns 4 having upwardly projected column reinforcing bars 5. The ends of the Y-directed beams 1' are placed on the tops of the beams l, and the lower end two-stage beams 3' are lapped crossingly. Under the condition, the lower end two-stage beams 3 are moved by sliding and placed between the groove bottoms of the beams 1 while crossing them with the beams 3'. Since the X-directed lower end two- stage beams are moved by sliding from the groove bottoms of X-directed beams to set them by crossing with the lower end two-stage beams of the Y-directed beams, the lower end beams can be simply set in upper and lower two stages.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a column-beam joining method for precast reinforced concrete structures, particularly to improvements in beam bottom reinforcement.

``Prior Art and Problems to be Solved by the Invention'' Conventionally, as a column-beam connection method for precast reinforced concrete structures, in which the connection point of the beam reinforcement is provided at the center of the beam between the columns, as shown in Figure 5, the column head After placing the ends of a pair of precast beams in the X direction that are connected to each other by a single beam bottom reinforcement, place the ends of a pair of precast beams in the same X direction on top, and cross the mutual beam bottom reinforcements. Next, a method of joining is carried out by arranging reinforcement at the top of the beam in both the X and Y directions and placing joint concrete at the column-beam joint.

However, in the conventional construction method, the beams in the XX direction are orthogonal and the lower end reinforcements of each other are overlapped in a crosswise manner. When placing the beam, the beam got caught in the two-stage lower end reinforcement on the upper side of the beam in the X direction, and the beam in the X direction could not be lowered to the specified position, so the lower end reinforcement of the beam in the X direction had no choice but to be placed in a single stage. I didn't get it.

Therefore, in order to solve the above-mentioned conventional problem, this invention has an open upper part. The joint ends of a pair of precast reinforced concrete beams facing each other in the horizontal The joint end of a pair of precast reinforced concrete beams facing each other in the horizontal Place the part on the head of the pillar, and in this state
Column beam of a precast reinforced concrete structure in which the bottom two-stage reinforcement placed on the bottom of the groove of the beam in the X direction is slid to be perpendicular to the bottom two-stage reinforcement in the X direction, and is bridged between the bottom of the groove of the beam in the X direction. This proposes a joining method.

"Function" When placing a beam in the X direction, the lower end reinforcement is not placed between the joint end faces of the beam in the is the lower end of the beam in the X direction −
The beam in the X direction can be placed on the column M portion without any problem by overlapping orthogonally to the stepped portion.

In addition, the lower end two-stage reinforcement in the X direction is slid from the bottom of the groove of the X-direction beam and arranged perpendicularly to the lower end two-stage reinforcement in the X direction, so it is extremely easy to connect without the need for welding or other joining work. With this work, it is possible to arrange the bottom reinforcement in two stages, upper and lower.

"Embodiments" Below, embodiments of the present invention shown in the drawings will be described.
A pair of precast reinforced concrete beams 1.1 placed opposite each other at a required interval in the horizontal They are connected by a stepped portion 2, and the height of the groove bottom surface is set to the height necessary to arrange the lower end two-stage reinforcement 3 on the upper surface thereof.

A pair of precast reinforced concrete beams 1'1' placed opposite each other in the horizontal
connected by.

When joining columns and beams, first place the required number of lower end reinforcements 3 in a freely movable state on the bottom of the groove of the beam 1 in the The ends of the beams 1 and 1 in the X direction are placed on the head of the column 4 made of precast concrete or cast-in-place concrete with a protrusion 5, and then the ends of the beams 1' and 1' in the X direction are placed on the head of the column l. 2 and 2' are placed on top of each other, and the lower ends of the service parts 2 and 2' are placed on top of each other at right angles.

In this state, lower end two-stage reinforcement 3 placed on the bottom of the groove of beam 1 in the X direction
is bridged between the bottom surfaces of the grooves of the beams 1 and 1 by sliding it so that it is perpendicular to the two-stage reinforcement 3' at the lower end in the Y direction.

After arranging the lower end reinforcements of the beams 1 and 1' in both the X and Y directions in two stages in this way, the upper end reinforcement 6 is arranged on the beams 1 and 1' as shown in Fig. 3, and the column-beam joint is And joint concrete is poured inside and on top of beams 1 and 1', and beam 1
, 1 and 1' 11, joint concrete is poured into one piece.

"Effects of the Invention" As described above, according to the present invention, when a beam in the The lower end of the step - step part and the lower end two-step bar are stacked orthogonally on the lower end - step part of the beam in the X direction,
A beam in the same direction can be placed on the column head without any problem.

In addition, the lower end two-stage reinforcement in the X direction is slid from the bottom of the groove of the X-direction beam and arranged perpendicularly to the lower end two-stage reinforcement in the X direction, so it is extremely easy to connect without the need for welding or other joining work. The bottom reinforcement can be arranged in two stages, upper and lower, with simple work.

Therefore, the strength of the beam-column joint in a high-rise building can be strengthened without any restrictions by arranging beam bottom reinforcements in two stages at the beam-column joint.

[Brief explanation of the drawing]

1 and 2 are side views sequentially showing the column-beam joining process according to the present invention, FIG. 3 is a front view of the beam in the X direction according to the present invention, and FIG. 4 is a front view of the beam in the Y direction, FIG. 5 is a side view showing the reinforcement arrangement of a conventional column-beam joint. 1...Beam in the X direction, 1'...Beam in the Y direction, 2.2'
・・Bottom end - stepped section, 3, 3' ・・Bottom end double reinforcement, 4・
・Column, 5... Column reinforcement, 6... Beam top end reinforcement. Figure 3

Claims (1)

[Claims] 1) Joint ends of a pair of precast reinforced concrete beams facing each other in the horizontal Place it on the head of the pillar,
Next, the joint ends of a pair of precast reinforced concrete beams facing each other in the horizontal Y direction are connected by a single-stage bottom reinforcement and a double-stage bottom reinforcement, which are arranged in two continuous and integral upper and lower stages between the lower parts of the opposing joint end surfaces. , placed on the head of the column, and in this state slide the lower end two-step reinforcement placed on the bottom of the groove of the beam in the X direction so that it is perpendicular to the lower end reinforcement in the Y direction. A column-beam connection method for precast reinforced concrete structures that spans between the bottoms of grooves.