JPH05179698A - Construction of pc column and beam - Google Patents

Abstract

PURPOSE:To achieve good dynamic characteristics at a joint part, and facilitate construction of a PC beam. CONSTITUTION:A PC beam formwork 20 has a U-letter shaped sectional form, and a cut part 23 of a specified length is formed at a center part of its length. A lower end main reinforcement 22 is embedded letting the cut parts 3 communicate with each other in a bottom part of the formwork 20. The formwork 20 is mounted at a head part of a PC column 10 constructed at a specified position by engaging the cut parts 23 of the PC formwork 23. It is mounted on the PC columns 10, 10 adjacent to each other, and a lower end connection reinforcement 26 is disposed between the PC beam formworks 20, 20 facing each other. The length of the lower end connection reinforcement 26 is set to be a fixing length which is sufficient to achieve an effect of a joint the lower end main reinforcement 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing columns and beams of a reinforced concrete structure prefabricated.

[0002]

2. Description of the Related Art Due to demands for labor saving in the field work and shortening of construction period, in recent years, a method of constructing a frame by constructing a frame by using hollow PC columns or PC beams with a U-shaped section has been developed. Has been done. For example, as shown in FIG.
The lower end main bar 2 which projects the end of the U-shaped PC beam formwork 20 horizontally from the head of the C-column formwork 10 and projects from the end surface of the PC beam formwork 2
A method is known in which the tip end of 2 is bent upward and fixed in the panel zone 30 formed above the PC column form 10.

Further, according to Japanese Patent Laid-Open No. 62-112249, a U-shaped PC beam formwork in which a lower end main bar is buried up to just both ends of the PC beam formwork is made to face each other at the head of the PC column. A known method is to arrange the lower end connecting rebars across both PC beam forms and join them in the vicinity of the lower main rebars after the placement.

However, in all of the above-described PC column / beam construction methods, the opposing bottom main bars of the PC beam formwork are joined in the panel zone 30 that is most affected by the seismic force. It is hard to say that the target property is good.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a column / beam construction method in which the mechanical properties of the joints are good and PC beams can be easily built.

[0006]

SUMMARY OF THE INVENTION A method of constructing a PC column / beam according to the present invention is a PC beam having a U-shaped cross section, having a notch at the center in the longitudinal direction, and having a bottom main bar connecting the notches. The mold is placed on the head of the PC column at the cutout, and
It is characterized in that it is placed on the adjacent PC columns, and a lower end connecting reinforcing bar is arranged between the facing PC beam forms.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. The present invention is to assemble a prefabricated reinforced concrete pillar formwork and a beam formwork and then pour concrete to construct a PC pillar and a PC beam.

FIG. 1 is a perspective view of a PC beam formwork 20 used in the PC pillar / beam construction method of the present invention. The formwork 20 has a U-shaped cross-section and has a predetermined length at the center in the longitudinal direction. The notch 23 is formed. In addition, a notch 23 is formed on the bottom of the mold 20.
The lower end main bar 22 is embedded in the lower end of the main bar 22. That is, the U-shaped PC beam form members 21, 21 are opposed to each other at a predetermined interval, and a common lower main reinforcement 22 is embedded in the bottoms of the form members 21, 21. The lower part of the stirrup 25 is embedded in the PC beam form 20, and the upper part is exposed.

FIG. 2 is a side view showing a state where a PC column and a PC beam are framed by the method of the present invention. In FIG. 2A, the head of the PC column 10 built in a predetermined position has a P
The notch 23 of the C-beam form 20 is engaged and the form 20 is placed. Further, the PC beam form 20 is also placed on the pillar head in a direction orthogonal to the PC beam form 20.

The lower end connecting rebar 26 is placed on the adjacent PC columns 10 and 10 and between the opposing PC beam forms 20 and 20.
To arrange. The length of the lower end connecting reinforcing bar 26 is set to a fixing length sufficient to obtain an effect as a joint with the lower end main bar 22.

In the embodiment shown in FIG. 2B, the lower end main bar 2
2 is not laid out to both ends, but a PC beam formwork 20 is laid out for a length of about one-half of the central portion in the longitudinal direction. The lower end connecting rebar 26, which is longer than 2 (a), is arranged.

[0012]

As described above, according to the present invention, since the lower end main bar of the PC beam is connected by the lower end connecting rebar in the central part of the beam that is not subjected to seismic force, the mechanical properties of the column-beam joint are good. That is, it has an excellent effect that the mechanical performance equivalent to that of the conventional method can be obtained while enjoying the advantages of labor saving in the field work and shortening of the construction period. Further, since it is not necessary to bend the fixing end portion of the lower end main reinforcement in the panel zone, it is extremely easy to build the PC beam formwork from two directions.

[Brief description of drawings]

FIG. 1 is a perspective view of a PC beam form frame 20 used in a PC pillar / beam construction method.

FIG. 2 is a side view showing a state in which a PC column and a PC beam are framed.

FIG. 3 is a perspective view showing a conventional method for joining a PC pillar formwork and a PC beam formwork.

[Explanation of symbols]

 10 PC Column 20 PC Beam Formwork 22 Bottom Main Bar 23 Notch 26 Bottom Connecting Reinforcing Bar

Claims (1)

[Claims] 1. A PC beam form having a U-shaped cross section, having a notch at the center in the longitudinal direction, and having a lower end main bar communicating with the notch, a head of a PC column at the notch. A method for constructing a PC column / beam, characterized in that it is placed on the adjacent PC columns, and a lower end connecting reinforcing bar is laid between the opposing PC beam forms.