JPH01187237A - Method for beam-column joining in precast reinforced concrete structure - Google Patents

Abstract

PURPOSE:To contrive enlargement of scope of application by changing method of anchorage for bottom reinforcements of precast concrete beam members, placed in X and Y directions and intersecting at a right angle, and by allowing increased number of the bottom reinforcements to be arranged. CONSTITUTION:On the top of a precast concrete column member A, precast concrete beam members Bx, to be placed in X direction, are placed in a way that the beams' bottom reinforcements 4, protruding horizontally from the end of the beam members facing each other, are placed in a butt-joint way, and enclosed welding is applied thereupon. Then, precast concrete beam members (By), to be place in Y direction, are placed on the top of the column member A with their bottom reinforcements 6 bent up in a hook-form at their protruding head at a position crossing the column's center-line. After dropping cross- reinforcements 7 between the crossed hook-shaped bottom reinforcements 6 of the beam members (By) facing each other, joining concrete D is placed in a beam-column joining space.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for joining columns and beams in precast reinforced concrete buildings.

(Conventional technology) Various construction methods have been developed for converting reinforced concrete frame structures into planar structures, and compared to conventional construction methods, labor savings and construction period are significantly shortened.

It is preferable to use a construction method in which columns, beams, floors, etc. are all made of a single piece of material, but in this case, the joint positions of the members are where the stress is greatest.

In particular, for columns, beams, and intersections, the main reinforcement of the column that protrudes from the column head intersects the protruding end of the lower end reinforcement of the beam in both the X and Y directions mounted on the same column head, and the reinforcing bars are arranged on each of the reinforcement bars. At the same time, reinforcements were placed at the tops of the beams, and concrete was poured to connect the columns and beams.

(Problem to be solved by the invention) Therefore, in the column-beam joint space, a large number of reinforcing bars are congested, and if the number of lower end reinforcements of the beam exceeds five, it becomes difficult to join the columns and beams. There were restrictions on the scope of application.

The present invention has been proposed in view of the problems of the above-mentioned prior art, and its purpose is to be able to arrange more reinforcements at the bottom end of beams than before in a prefabricated frame structure.
The object of the present invention is to provide an improved column and beam joining method that expands the range of application of the same structure.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a precast concrete beam member in the X direction in which the lower cylindrical end of the beam is horizontally protruded from the column head of the precast concrete column member. The members are mounted so that the bottom reinforcements butt against each other, the butt ends of the bottom reinforcements are enclose welded, and then the protruding end of the bottom reinforcement of the beam is bent upward into a hook shape at the position where it crosses the column center line. The precast concrete beam member in the X direction perpendicular to the X direction thus formed is mounted on the capital of the column member, and a transverse reinforcement is dropped between the hook-shaped bottom reinforcement ends of the opposing beam members that intersect with each other. , which is characterized by placing joint concrete in the column-beam joint space.

(Function) As described above, the present invention uses a precast concrete beam member in the X direction in which the lower cylindrical end of the beam protrudes horizontally, and the lower cylindrical end of the beam extends upward in a hook shape at a position beyond the column center line. Using a precast concrete column member bent in the Since the main reinforcing bars at the lower ends are joined by enclosure welding, the lower end reinforcing bars of the beam members facing each other in the X direction do not intersect. Therefore, even if the number of lower end reinforcements of the beam members exceeds five, it is possible to join them.

Next, a beam member in the X direction is mounted on the column head, and a horizontal reinforcement is inserted between the hook-shaped bottom reinforcement ends of the opposing beam members that intersect with each other to join them, and in this way, they are installed later. Since the lower end reinforcements of the beam members in the X direction are bent and fixed within the column-beam intersection, construction is possible even if there are a large number of beam lower end reinforcements.

After the lower end reinforcements of each of the beam members are joined at the head of the column, joining concrete is placed in the column-beam joint space to join the columns.

(Example) The present invention will be described below with reference to the illustrated embodiments.

The column is a precast concrete column member, and the upper end of the main column reinforcement (1) protrudes from the head of the column, which is precast from the floor to the bottom of the beam, by a length equal to the length of the beam plus the length of the reinforcing bar joint. At the bottom end of (1) is a sleeve for reinforcing bar joints (2
) is installed. (See Figure 7) (C) is a precast concrete beam member in the X direction,
The slab thickness portion of the cross section is missing, the ribs (3) protrude from the upper surface, and the ends of the beam bottom reinforcements (4) protrude horizontally.

(See Figure 8) (C) is a precast concrete beam member in the X direction perpendicular to the X direction, where the slab thickness part of the cross section is missing, the ribs (5) protrude from the top surface, and the beam bottom reinforcements (6). The protruding end portion of the rod is bent upward at 90° at a position beyond the column center line to form a hook-shaped portion. (See FIG. 9) After setting the inside of the column member at a predetermined position, a beam member (X) in the X direction is mounted between the column heads.

(See Fig. 4) When installing the beam member (X), the protruding ends of the lower end reinforcements (4) of the beam member (X) facing each other in the X direction are butted against each other at the column head and joined by enclosure welding.

(See Figure 5) Next, attach a beam member (By) in the X direction to the column head of the column member body).
be placed on the shelf. At this time, the hook portions of the lower end reinforcements (6) of the opposing beam members (By) are installed so as to occupy a position beyond the column center line, and the lower end reinforcements (6) of the opposing beam members (By) that intersect with each other are There is a transverse strip between the 7-shaped parts at the end of the
Lower end reinforcements (6) of the beam member (By) facing each other are restrained via the same transverse reinforcement (7). (See Figure 6) Thus, XlY
Bidirectional precast concrete beam members (Bz) (B
After the installation of step y) is completed, install the precast concrete floor plate (C) or the semi-finished precast concrete floor plate that also serves as formwork, arrange the reinforcement bars (8) at the column and beam intersections,
Beam members in the X and Y4 directions (B3:) (Upper beam reinforcement of B (9)
), then concrete is placed at the column-beam intersection and the top of the beam, and each member is integrated. (Refer to Figures 1 to 3) After pouring the concrete (D), the upper floor column member (A') is installed at 5 as shown by the arrow in Figure 1, and the above-mentioned work is then carried out. Repeat this process to construct a precast reinforced concrete structure.

As mentioned above, the illustrated embodiment is characterized in that the method of fixing the lower end reinforcements of the precast concrete beam members (Bz) and (By) in both the X and Y directions, which are orthogonal to each other at the column-beam intersection, is different. be.

In other words, the lower end reinforcements (4) of the opposing beam members (shi) in the X direction, which are installed on the column head in advance, butt against each other without crossing each other and are joined by enclosure welding, so there are five lower end reinforcements (4) of the beam. It is possible to join even if the width exceeds 100 mm, and if the welding work of the lower end reinforcement (4) is performed before installing the beam member in the X direction, the workability will not be impaired.

In addition, since the beam member (B31) to be installed later is bent and fixed within the column-beam intersection, it can be constructed even if the number of beam bottom reinforcements (6) of the beam member (By) increases, and precast reinforced concrete The scope of application of building construction methods will be greatly expanded.

(Effects of the Invention) According to the present invention, as described above, a pre-cast concrete beam member in the X direction in which the lower end foil end of the beam projects horizontally and the projecting end of the lower end reinforcement of the beam crosses the column center line. Two types of beam members are used: a precast concrete beam member in the X direction that is bent upward into a hook shape at a position, and the beam member in the X direction is placed on the column head in advance, and the The protruding ends of the lower end reinforcements of the beam members are butted and enclosure welded without crossing each other, and then the above-mentioned X
By mounting horizontal beam members in the same direction and inserting transverse reinforcement between the hook-shaped bottom reinforcement ends of the opposing beam members that intersect with each other, columns, beams, etc. are all prefabricated into a single precast concrete member. In the construction method of rigid frame, it is possible to arrange more reinforcements at the bottom of the beam than in the conventional construction method, and the range of application can be expanded.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing the joints of columns and beams in a precast reinforced concrete building constructed by the method of the present invention, Fig. 2 is a plan view thereof, and Fig. 3 is a view taken along the arrows in Fig. 1. , Fig. 4 to Fig. 6 show the steps of the method of the present invention, Fig. 4 is a front view, Fig. 5 is an enlarged longitudinal sectional view of main parts, and Fig. 6 is a
7 is a front view of a precast concrete column member, and FIGS. 8 and 9 are slope views of each precast concrete beam member in the X direction with respect to the difference in the X direction. Prisoner... Precast concrete column member, (lllb
) -- Precast concrete beam member in the X direction, (By)... Precast concrete beam member in the X direction (D)... Concrete, (41 (6)... Beam bottom reinforcement, (7)...・Horizontal muscle

Claims (1)

[Claims] A precast concrete beam member in the X direction with a horizontally protruding end of the beam bottom reinforcement is mounted on the capital of the precast concrete column member so that the bottom reinforcements of the opposing beam members are butted against each other. The butt ends are enclose welded, and then the precast concrete beam member is bent upward into a hook shape at a position where the protruding end of the beam bottom reinforcement crosses the column center line in the Y direction perpendicular to the X direction, and then attached to the column. After placing the beam on the column head of the member and inserting the transverse reinforcement between the hook-shaped bottom reinforcement ends of the opposing beam members that intersect with each other,
A method for joining columns and beams in precast reinforced concrete buildings, which is characterized by placing joint concrete in the space between columns and beams.