JPH058303B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of constructing columns and beams in a steel-framed reinforced concrete structure in which the columns and beams are prefabricated.

[Problem to be solved by the invention]

In recent years, methods have been developed for constructing the frames of reinforced concrete buildings from prefabricated columns and beams, reflecting the demand for simplification and labor-saving on-site work, and thereby shortening the construction period.

In view of these trends, this invention was made for the purpose of providing a method for labor-saving work, and is intended to propose a method of constructing columns and beams that makes it possible to further shorten the construction period.

[Means for solving problems]

In this invention, the main reinforcements, stirrups, and stirrups are embedded in the column formwork and beam formwork, and these are made of precast concrete, and by constructing the column formwork and beam formwork, it is possible to assemble the formwork. Eliminates the need for dismantling and installing shoring, saving labor on site.
We will also aim to shorten the construction period.

The beam formwork is made into a box shape with main reinforcing bars and stirrups buried, and is installed on the slab on the lower floor. Inside, there are vertical bars that pass through the joint in the height direction and tie bars that are wrapped around the middle part. The prefabricated reinforcing bars consisting of are arranged and filled with concrete.

The beam formwork is made into a U-shape with the bottom main reinforcement and stirrup buried under the ground, and the end is placed on the column formwork. A lower end connecting reinforcing bar that connects the lower end main reinforcement,
The top main reinforcement that also passes through the joint is placed and filled with concrete.

To construct the joint, a column formwork is built on the slab on the lower floor, the end of the beam formwork is placed on the upper end of the column formwork, and the lower end connecting reinforcing bars are installed across the lower end main bars of the opposing beam formworks. After arranging reinforcement and connecting the lower end main reinforcement, insert the prefabricated reinforcing bars inside the column formwork, position the stirrups between the ends of the beam formwork, and then place the stirrups on the lower side of the stirrups that protrude above the beam formwork. Place the upper main reinforcement across the opposing beam formwork, and fill the inside of the column formwork and beam formwork with concrete.

〔Example〕

This description will be made below based on drawings showing one embodiment.

This invention is a method of constructing columns and beams by assembling column formwork A and beam formwork B made of precast concrete, and pouring concrete inside them.

The column formwork A has the main reinforcement 1a and the stirrups 2a buried therein, and is manufactured to have a box-shaped hollow cross-section as shown in Figs. It is manufactured to have a U-shaped cross section as shown in FIGS. 1 and 3.

The stirrup 2b has its lower side buried in the beam form B, and its upper side protrudes from the beam form B, and the upper end main reinforcement 3b is arranged at the protruding part.

Main reinforcement 1a of column formwork A and lower end main reinforcement 1b of beam formwork B
The length is up to the end of each formwork as shown in Figs. Accordingly, the lower end main reinforcements 1b, 1b of the plurality of opposing beam forms B, B are connected by the lower end connecting reinforcing bars 4-1.

As shown in Fig. 1, the assembled reinforcing bar C is assembled from a vertical bar 1c having a length that passes through the joint in the height direction, and a tie bar 2c wrapped around the intermediate part in the height direction, and is assembled into a column formwork. The lowest strap 2c inside A
The tie bars 2c are inserted between the beam forms B and B,
In other words, it is located at the column/beam joint.

The lower end connecting reinforcing bars 4-1 have a length sufficient to be connected to the lower end main reinforcements 1b, 1b by lap joints,
The reinforcing bars are arranged so as to straddle the plurality of opposing beam forms B, B, and to overlap with the lower end main reinforcing bars 1b, 1b.

The upper end main reinforcement 3b is a stirrup 2 as described later.
By moving the beam formwork B to the opposite side after installing it with it temporarily fixed to b, or by moving it to the opposite side, or by
As shown in the figure, a plurality of beam formworks B are bound in advance to the stirrup 2b, and the upper end connecting reinforcing bars 4-3 are later installed so as to overlap the upper end main reinforcing bars 3b, as in the case of the lower end main reinforcing bars 1b. Reinforcement is placed across B and through the joint. In the former case,
The upper end main reinforcement 3b is inserted through the joint by sliding from the beam formwork B, and in the latter case, each upper end main reinforcement 3b, 3b of a plurality of opposing beam formworks B, 3b.
As shown in Figures 2 and 3, after the beam form B is installed, the upper end connecting reinforcing bars 4-3 are placed across the opposing beam forms B and B, and are connected at the joint by lap joints. .

For the column-beam joint, after the column formwork A is erected on the slab on the lower floor, the ends of the multiple beam formworks B and B are placed on top of it, as shown in Figure 1. , After connecting the lower end main reinforcements 1b, 1b with each other by arranging the lower end connecting reinforcing bars 4-1 across the lower end main reinforcements 1b, 1b of the plurality of opposing beam forms B, B, the assembled reinforcing bars C are attached to the column formwork. The stirrup 2c is inserted into the inside of the beam formwork A and placed between the ends of a plurality of opposing beam formworks B, B, and one of the above-mentioned stirrups is placed below the stirrup 2b that protrudes above the beam formwork B. Construction is carried out in the following steps: the upper end main reinforcement 3b is placed through the joint, and the inside of the column formwork A and the beam formwork B are filled with concrete.

Next, the construction procedure for one layer of the frame will be specifically explained with reference to FIG.

In Fig. 4, the upper end main reinforcements 3b, 3b are tied to the stirrup 2b and reinforced, and after the beam formwork B is installed, the upper end main reinforcements 3 of the opposing beam formworks B, B are arranged.
This is an example in which the upper end connecting reinforcing bars 4-3 are arranged across the columns b and 3b and are reinforced through the column-beam joint. In this case, both the lower end connecting reinforcing bars 4-1 and the upper end connecting reinforcing bars 4-3 are given a sufficient anchoring length to achieve the joint effect with the respective lower end main reinforcements 1b and upper end main reinforcing bars 3b. In addition, as shown in Fig. 3, the lower end main reinforcements 1b, 1b and the upper end main reinforcements 3b, 3b in the intersecting directions.
, lower end connecting reinforcing bar 4-1 and upper end connecting reinforcing bar 4-3.
Steps are added to avoid interference during reinforcing.

First, column formwork A is erected on the main column reinforcement that protrudes from the top surface of the slab on the lower floor or is assembled on the slab (), and multiple beam formworks B and B are erected on its upper end facing each other in one direction. Then, the beam form B in the direction orthogonal to this beam form B is installed in the same manner as the column form A,
Straddle over A (). When building column formwork A,
The main column reinforcement will fit inside it.

Next, place the slab PC plate 5 on the beam formwork B (), place the lower end connecting reinforcing bars 4-1 between the beam formworks B and B (), and install the assembly reinforcing bars C into the column formwork A. insert().

Next, connect the upper end connecting reinforcing bars 4-3 to the upper end main bars 3b, 3b.
(), and after placing slab mesh reinforcement 6 on the slab PC plate 5 (), concrete is poured inside the column formwork A and beam form B and on the slab PC plate 5. Construction of the column/beam joint is completed. Thereafter, the frame is constructed by repeating the steps from () to ().

Next, the construction procedure of the embodiment shown in FIG. 5 will be explained.

In this embodiment, the upper main reinforcement 3b is stirrup 2b.
This is a method of temporarily fixing the reinforcing bars C, and then moving them to the beam form B side after the erection of the assembled reinforcing bars C, thereby straddling both opposing beam forms B, B, and penetrating the joint. In this case, the upper end main reinforcements 3b, 3b are temporarily fixed to one beam formwork B in two stages, and after placing the opposing beam formworks B, B on the column formwork A,
It is slid to the other beam form B and connected to the upper end main reinforcement 3b on that side. Joints are gas pressure welding, lap joints, couplers, etc.

First, as in the case of Fig. 4, column formwork A is built on the slab (), beam formwork B is placed on column formwork A in one direction (), and beam formwork perpendicular to this is placed (). Place B ().

Next, the slab PC version 5 is installed on the beam formwork B (), and the assembly reinforcing bars C are installed following the reinforcement of the lower end connecting reinforcing bars 4-1 ().

Subsequently, the upper end main reinforcement 3b temporarily fixed in two stages,
3b to the opposing beam forms B, B, and connect them to the upper end main reinforcements 3b, 3b on that side (), and then place the slab mesh reinforcements 6 ().
Concrete is poured () and columns and beams are constructed.

〔Effect of the invention〕

This invention is as described above, and since the joint is configured by a column formwork made of precast concrete with main reinforcement, stirrups and stirrups embedded, and a plurality of opposing beam formworks, the joint part is There is no need to assemble and dismantle formwork and install supports, and columns and beams can be constructed on site by simply arranging lower end connecting reinforcing bars, upper end connecting reinforcing bars, assembly reinforcing bars, and pouring concrete. It is possible to save labor and shorten the construction period.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the beam formwork and assembly reinforcing bars installed on the column formwork, FIG. 2 is a plan view thereof, and FIG. 3 is a vertical sectional view thereof. FIGS. 4 and 5 are elevational views showing the construction procedure for one layer of the frame. A... Column formwork, 1a... Main bar, 2a... Stir bar,
B...beam formwork, 1b...lower end main reinforcement, 2b...stirrup, 3b...upper end main reinforcement, 4-1...lower end connecting reinforcing bar, 4-3...upper end connecting reinforcing bar, C...assembly reinforcing bar, 1c... ...Vertical bar, 2c...Stir bar, 5...Slab
PC version, 6...Slab mesh muscle.

Claims (1)

[Claims] 1 A precast concrete column formwork with the main reinforcing bars and ties buried is built on the slab on the lower floor, and a U-shaped precast concrete beam with the bottom main reinforcing bars and stirrups buried. After placing the end of the formwork on the column formwork and placing the lower end connecting reinforcing bars near the lower end main reinforcements that span between the opposing beam formworks and connect to the lower end main reinforcements of each beam formwork, An assembly reinforcing bar consisting of a vertical bar with a length that penetrates the column-beam joint in the height direction and a tie bar wrapped around the middle part of the longitudinal bar is inserted into the column formwork to create a tie bar. The top main reinforcement is placed between the ends of the beam formwork, and the top main reinforcement is placed below the stirrup of each beam formwork, spanning between the beam formworks and passing through the column-beam joint. A method of constructing columns and beams in which concrete is poured into beam formwork to form joints.