JPH02194227A - Jointing method for precast concrete pillar with pillar beam - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a method for joining a precast concrete column (hereinafter referred to as a PC column) and a semi-precast concrete beam (hereinafter referred to as a semi-PC beam), and a method used in the same method. This is related to the PC pillar.

(Prior technology) Conventionally, PC columns were manufactured in a factory from the column base to the bottom end of the beam, and then erected on site. After placing the main reinforcement and shear reinforcing bars, the outer formwork for forming the panel zone was installed, concrete was poured, and the PC columns and beams were connected.

(Problems to be Solved by the Invention) However, the conventional construction method has the following problems.

i) It is not possible to secure the necessary anchorage length for the beam main reinforcement only within the panel zone.

li) In cases where beams intersect in the panel zone, P
The main reinforcements of the C-beams and PC columns were driven and fixed, so it was extremely difficult to work on site in terms of fitting the beam main reinforcements and hoops within the panel zone. .

1i) Since on-site concrete placement in the panel zone is work in areas where reinforcing bars are densely packed, it is difficult to place concrete densely enough and defects are likely to occur.

iv) The outer formwork forming the panel zone was only at the four corners of the pillars, and it was difficult to fix the formwork.

The present invention has been proposed in view of the problems of the prior art, and its purpose is to provide a method for joining PC columns and beams that is easy and reliable in construction and has high structural reliability. ,
and to provide PC pillars that can be applied to the same construction method.

(Means for Solving the Problems) In order to achieve the above object, the PC column and beam joining method according to the present invention incorporates column main reinforcement and shear reinforcement, and connects upper and lower beam main reinforcement at one end of each at the beam joining position. A precast concrete column is erected in a predetermined position so as to protrude from the column surface, and then a semi-precast concrete beam is erected, and the protruding end of the beam bottom reinforcement of the beam and the beam installed at the site are After joining the upper end reinforcement and the column surface protruding ends of the lower main beam reinforcement and the upper main beam reinforcement, respectively, and placing beam reinforcing bars at the column-beam joint, pour the column-beam joint concrete. This is a characteristic feature.

In this case, it is desirable that the anchoring end portions of the upper and lower beam main reinforcements buried in the columns be curved in order to increase the anchoring force.

In addition, in order to smoothly carry out the joining method of the PC columns and beams,
The PC column according to the present invention is constructed by incorporating column main reinforcements and shear reinforcing bars, fixing the upper and lower beam main reinforcements at the beam joining position, and making the ends of each of the beam main reinforcements protrude from the column surface.

(Function) According to the present invention, a PC column is erected at a predetermined position, which has a built-in column main reinforcement and a shear reinforcing bar, and has upper and lower main reinforcements fixed at the beam joining position so that one end of each is protruded from the column surface. Then, a half PC beam is erected and the protruding end of the beam bottom reinforcement of the same beam and the PC
The protruding end from the column surface of the lower beam main reinforcement fixed to the column, and the protruding end from the column surface of the beam upper end reinforcement installed on the site and the upper beam main reinforcement fixed to the PC column are respectively connected. After arranging beam reinforcing bars at the column-beam joint, a joint concrete is placed at the joint, thereby creating a PC-column-beam joint in which sufficient anchorage length is secured for the beam main reinforcement. Further, since reinforcement within the panel zone is not done on site but in a factory, reinforcement can be reliably arranged and concrete can be placed easily and reliably.

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

(A) is a PC column whose length is equal to the height of one floor from the floor top to the floor top of the upper floor.

The main bar (1) has a splice sleeve (2) at the leg.
Connecting hardware such as these are attached, and a length necessary to connect to the splice sleeve (2) of the PC column (A) on the upper floor protrudes from the column head. In addition, the main column reinforcement (1)
Shear reinforcing bars (3) are arranged between them.

On the other hand, in the panel zone, the hook-shaped anchor base ends (4a) and (5a) of the upper main beam reinforcement (4) and the lower main beam reinforcement (5) are buried to ensure the required anchorage length. The tips of the main beam reinforcements (4) and (5) protrude from the column surface by a length necessary to connect with the beam reinforcement of the PC beam.

The PC column (A) is manufactured in a factory, and the column main reinforcement (1), shear reinforcement (3), splice sleeve (2), and upper and lower beam main reinforcement (4) (5) in the panel zone are installed in the column formwork for forming the PC column. )
It is manufactured by setting and pouring concrete.

In this case, the reinforcing bars in the panel zone can be easily arranged because the beam main reinforcements are relatively short and the other reinforcing bars can move relatively freely.

(B) is a half-PC beam with the beam bottom reinforcement (6) protruding from the beam end, a part of the cost reinforcement (7) protruding from the top of the beam, and a cotter (8) installed on the beam end. has been done.

Then, the PC column (A) is erected at a predetermined position, and then the half PC column (B) is supported by the erection support (9), and the beam top end reinforcement 0ω is arranged on site, and the top end of the beam is Muscle 01lD
And the protruding end of the beam lower end reinforcement (6) and each protruding end of the lower main beam reinforcement (4) and the lower main beam reinforcement (5) in the PC column (^) are connected by welding (@) or a sleeve, etc. , After placing beam reinforcing bars (10) between each of the beam reinforcements (4), (6), and (5) at the column-beam joint, the beam formwork for the column-beam joint is installed, and the column-beam joint concrete (C) is created. The PC beams (A) and (B) are joined by pouring the concrete.

(Effects of the Invention) According to the present invention, as described above, the upper and lower beam main reinforcements are fixed at the column-beam joint position of a PC column having built-in column main reinforcements and shear reinforcing bars so that one end of each of them protrudes from the column surface. By doing so, the anchoring length of the main beam reinforcement can be easily ensured, and the strength of the beam-column joint can be improved.

According to the present invention, after the PC column configured as described above is erected at a predetermined position, a half-PC beam is erected, and the protruding end of the lower end of the beam of the half-PC beam and the beam to be reinforced on site are The upper end muscle,
After connecting the protruding ends of the lower main beam reinforcement and the upper main beam reinforcement of the PC column, and placing beam reinforcing bars at the column-beam joint, column-beam joint concrete is poured, and the PC column and beam are connected. They are joined together as one piece, and in this case, the complicated reinforcing work within the panel zone is not done on site, but is done in the factory, so that the reinforcing work can be done easily and reliably.

In addition, when concrete is placed on site in areas with complex reinforcement within the panel zone, there are restrictions in terms of equipment and concrete placement methods, so there is a problem with the filling properties of the concrete, but the method of the present invention According to this, this problem will be resolved.

According to the second aspect of the present invention, anchoring portions are curved at the ends of the upper and lower beam main reinforcements of the PC column to be buried within the company, thereby increasing the anchoring force of each of the beam main reinforcements in the panel zone.

The invention of claim 3 incorporates column main reinforcements and shear reinforcing bars in the PC column, fixes upper and lower beam main reinforcements at the beam joining position, makes the ends of each of the beam main reinforcements protrude from the column surface, and uses the PC column to This allows the PC column beam joining method to be carried out smoothly.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing the implementation status of one embodiment of the precast concrete column and beam joining method according to the present invention, Fig. 2 is a longitudinal cross-sectional view of the precast concrete column according to the present invention, and Fig. 3 is a semi-precast concrete column. It is a partial perspective view of a concrete beam. (^)...PC column (B)...Semi-PC beam (
C)... Column-beam joint concrete (+)... Main reinforcement (3)... Shear reinforcement (4)... Upper beam main reinforcement (5)... Lower beam main reinforcement (6)... Beam rib OI...
Beam reinforcement on beam 01)...Beam rib Fig. 3 Part 1

Claims (3)

[Claims] (1) A precast concrete column with built-in column main reinforcement and shear reinforcing reinforcement, and with upper and lower beam main reinforcement fixed at the beam joint position so that one end of each protrudes from the column surface, is erected at a predetermined position,
Next, a semi-precast concrete beam is erected, and the protruding end of the beam bottom reinforcement of the beam and the beam top end placed on site,
Precasting characterized in that the column surface protruding ends of the lower beam main reinforcement and the upper beam main reinforcement are respectively connected, and beam ribs are placed at the column-beam joint, and then column-beam joint concrete is poured. Connection method for concrete columns and beams. (2) The method for joining precast concrete columns and beams according to claim 1, wherein anchoring portions are curved at the ends of the main reinforcements of the upper and lower beams to be buried in the columns. (3) A precast concrete column having a built-in column main reinforcement and shear reinforcing bars, upper and lower beam main reinforcements fixed at the beam joining position, and the ends of each of the beam main reinforcements protruding from the column surface.