JPH0633512A - How to join columns and beams - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] To provide a method for joining columns and beams that can join precast concrete beams with different beam diameters without the need for extra concrete or reinforcing bars. Is. [Structure] When precast concrete beams 3 and 4 having different beams are joined at the head of the precast concrete column 1, the precast concrete beams 3 having large beams are used.
Of the precast concrete pillar 1 in which the connection end portions 3d are placed opposite to each other in both ends of the mounting groove 2 provided on the top surface of the precast concrete pillar 1, and are orthogonal to the mounting groove 2. Precast concrete beams with small beams 4
After placing the joint end 4d of the above, a precast concrete floor slab is installed between these precast concrete beams 3 and 4, and then concrete is placed on the precast concrete slab and in the joint of the precast concrete beams 3 and 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining columns and beams in a precast concrete structure.

[0002]

2. Description of the Related Art Conventionally, when connecting precast concrete beams having different beam ridges to the column head of a precast concrete structure, a vertical step is generated on the main beam of the beam due to the difference in beam ridges. ) And (2)
The joining method shown in FIG.

(1) is a method of joining a precast concrete beam 10 having a small beam to the lower part of the precast concrete beam 10 by providing a struck portion 10a so that the precast concrete beam having a large beam and the beam are joined together, and (2) is a beam. A haunch 10a is attached to the bottom of both ends of the precast concrete beam 10 with a small diameter.
Is a method of joining precast concrete beams with large beams and beams with the same beams.

[0004]

However, in the cases of the above (1) and (2), in order to design the cross section of the precast concrete beam as an unnecessarily large cross section,
There are problems such as needing more concrete than necessary, needing more reinforcing bars, and needing a lifting machine with greater capacity, and more materials and costs will be spent than the original cross section. . The present invention has been made in view of the above problems, and an object thereof is to join a precast concrete beam having a different beam diameter, which can be joined without requiring extra concrete or reinforcing bars. And to provide a method of joining beams.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention for solving the above-mentioned problems is to provide a column-to-beam joining method for connecting precast concrete beams having different beam ridges with column heads. Precast concrete with large beams is placed on both ends in the mounting groove provided on the surface, and the precast concrete with small beam is placed on the top surface of the column in the direction orthogonal to the mounting groove. It consists in placing the joint ends of the beams and placing concrete at the intersections of these precast concrete beams to join them.

[0006]

According to the present invention, the mounting groove is provided on the top surface of the column, and the connecting end portions of the precast concrete beam having a large beam is mounted on both ends of the mounting groove while the mounting groove is used. By placing the joint end of the precast concrete beam with a small beam on the top surface of the column in the direction orthogonal to the groove, it is sufficient to use the precast concrete beam with the minimum beam weir required for the design. Precast concrete beams can be joined at the column head without the use of concrete or rebar.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view of a precast concrete column, FIG. 2 is a perspective view of a precast concrete beam with large beams, and FIG. 3 is a perspective view of a precast concrete beam with small beams. The precast concrete pillar 1 is manufactured in advance in a factory, and a mounting recess groove 2 having a width similar to the beam width is formed in only one direction on the top surface of the head thereof, and the main bar 1a is projected. Has been done. The above-mentioned mounting groove 2 is for mounting a precast concrete beam 3 having a large beam diameter, and the depth thereof is set to a depth corresponding to the difference between the beam diameter of the precast concrete beam 3 having a small beam diameter and the beam diameter of the precast concrete beam 4. .

FIGS. 2 and 3 show precast concrete beams 3 and 4 having different beam sills. In both cases, up to the beam slab except the thickness of the existing floor slab is precast concrete 3a and 4a, and the upper surface thereof. A part of the stirrups 3b, 4b is formed so as to project, and a plurality of lower main bars 3c, 4c in one row are provided in a protruding manner at the joint ends at both ends. Among these precast concrete beams 3 and 4, the precast concrete beam 3 having a large beam diameter is to be placed in the mounting groove 2 of the precast concrete column 1 and has a small beam diameter. The beam 4 is placed in a direction orthogonal to this.

Next, a method of joining the precast concrete pillar 1 and the precast concrete beams 3 and 4 will be described. FIGS. 4 and 5 show a method of joining precast concrete beams having a single-stage lower main bar, in which precast concrete beams 3 having large beam gaps are placed between precast concrete columns 1 that are erected at predetermined locations. Build. In this method, the joint ends 3d of the precast concrete beam 3 having a large beam are placed on both sides of the precast concrete column 1 in the mounting groove 2 so as to face each other, and the lower main reinforcements 3c are superposed on each other for positioning.

Next, after the precast concrete beam 3 having a large beam is positioned, the joining end 4d of the precast concrete beam 4 having a small beam which is orthogonal to the beam is orthogonal to the mounting groove 2 described above. The precast concrete pillars 1 are placed facing each other on the top surface of the precast concrete pillars 1 and the lower main bars 4c thereof are superposed. The lower main reinforcement 4c is the lower main reinforcement 3c of the precast concrete beam 3 having a large beam diameter.
Is crossed to the upper part of.

Then, the upper main bars 3e and 4e of both of these precast concrete beams 3 and 4 are replaced with the lower main bars 3 and 4, respectively.
The muscles are arranged according to c and 4c. Therefore, even if the precast concrete beams 3 and 4 have different beams,
It is possible to make the upper surfaces of the beam ridges at the same height and to lay them between the precast concrete columns 1.

Next, after assembling the required formwork and installing a precast concrete floor slab (not shown) between the precast concrete beams 3 and 4, the precast concrete beams 3 and 4 and the precast concrete beams 3 and 4 are joined together. Pour these precast concrete pillars 1
And the precast concrete beams 3 and 4 are joined.

6 (1) and 6 (2), the lower main bar 4c is a precast concrete beam 4 having a two-step reinforcement with a small beam strain, and the lower main bar 3c is a precast concrete having a large beam strain having a one-step reinforcement. This shows a method of joining with the beam 3, and in this case as well, joining is carried out by the same method as described above.

7 (1) and 7 (2), the lower main bar 3c is a precast concrete beam 3 with a two-step reinforcement having a large beam strain, and the lower main bar 4c is a precast concrete having a one-step beam with a small beam strain. The method of joining with the beam 4 is shown. In this case, for placement so that the lower main bar 4c of the precast concrete beam 4 with a smaller beam is arranged on the lower main bar 3c on the upper side of the two-stage bar of the precast concrete beam 3 with a large beam. The groove 2 is formed.

Further, in (1) and (2) of FIG. 8, a precast concrete beam 3 with a lower main bar 3c having a two-step reinforcement and a large beam failure and a precast concrete having a lower main bar 4c having a two-step reinforcement with a small beam failure are provided. This shows a method of joining with the beam 4, and in this case as well, joining is performed by the same method as described above.

[0016]

[Effects of the Invention] The connection ends of the precast concrete beams having large beam gutters are placed on both ends of the mounting groove provided on the top surface of the precast concrete column, and in the direction orthogonal to the mounting groove. After placing the joint end of the precast concrete beam with a small beam on the top surface of the column, by placing concrete at the intersection of these precast concrete beams and joining them, the precast concrete beams with different beams are connected to the column head. Even when joining in parts, it is possible to join without requiring extra concrete or reinforcing bars.

[Brief description of drawings]

FIG. 1 is a perspective view of a precast concrete column.

FIG. 2 is a perspective view of a precast concrete beam with large beams.

FIG. 3 is a perspective view of a precast concrete beam having a small beam diameter.

FIG. 4 is a plan view in which a precast concrete beam having a different beam diameter is placed on a precast concrete column, and an upper main bar is arranged through.

FIG. 5 (1) is a side view in which precast concrete beams having different beams are placed on a precast concrete column, and FIG. 5 (2) is a sectional view thereof.

FIG. 6 (1) is a side view in which precast concrete beams having different beams are placed on a precast concrete column, and FIG. 6 (2) is a sectional view of the same.

FIG. 7 (1) is a side view in which precast concrete beams having different beam diameters are placed on a precast concrete column, and (2) is a cross-sectional view thereof.

FIG. 8 (1) is a side view in which precast concrete beams having different beams are placed on a precast concrete column, and FIG. 8 (2) is the same sectional view.

9 (1) and (2) are side views of a conventional precast concrete beam.

FIG. 10 is a front view of a conventional precast concrete beam.

[Explanation of symbols]

 1 Precast concrete pillar 2 Mounting groove 3 Precast concrete beam with large beam 4 Precast concrete beam with small beam

Claims (1)

[Claims] 1. A method of joining a column and a beam in which precast concrete beams having different beam diameters are connected by a column head, in a precast concrete having large beam diameters at both end sides in a mounting groove provided on the top surface of the column. Place the connecting end of the beam, place the joint end of the precast concrete beam with a small beam on the top surface of the column in the direction orthogonal to the mounting groove, and cast concrete at the intersection of these precast concrete beams. A method of joining a column and a beam, which is characterized by installing and joining.