JPH0481011B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method of constructing a frame of a composite structure of reinforced concrete and steel beams.

[Problem that the invention seeks to solve]

Until now, construction methods have been developed with the main purpose of streamlining the construction of reinforced concrete structures.
In particular, the applicant has already proposed several construction methods for streamlining construction by joining precast concrete columns and steel beams. For example, there is an invention disclosed in Japanese Unexamined Patent Publication No. 12441/1983.

This invention was made with the aim of further simplifying the structure, facilitating production, and shortening the construction period by improving the existing construction methods.・This is attempted to be achieved by joining the beams and creating a composite structure for the frame.

[Means for solving problems]

In this invention, the beams that are part of the frame are made of steel, the columns are made of PC, and the floor slabs are made of thin PC plates that also serve as formwork, making the construction unsupported and reducing the overall construction period. , and realize cost reduction.

The columns are made of precast concrete with built-in main reinforcement and tie reinforcements. The main reinforcement protrudes from the top of the column. The lower part of the column also has a joint hole into which the main reinforcement is inserted and connected.

This column is erected at a predetermined position on the slab, its main reinforcement and the main reinforcement of the lower floor column protruding from the top surface of the slab are connected to each other at the joint hole, and the lower end of the column is filled with mortar and connected to the lower floor column. do.

Next, steel beams are erected between adjacent columns, and the upper and lower flanges of the opposing steel beams on one column are connected by bolts to each other using battledore bolt-shaped upper and lower joint metal fittings that protrude from the side of the column.

Next, a thin PC slab that also serves as the floor formwork is placed on the steel beams, slab reinforcement is placed on top of this, and concrete is poured. At this time, the main column reinforcements protrude from the top of the slab, the columns are re-erected and connected to the columns on the lower floor, and the process is repeated until slab concrete is poured to construct the frame.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment.

This invention is a precast concrete column 1
(hereinafter referred to as PC columns 1), steel beams 2, thin PC plates 3, and cast-in-place slab concrete 4 to construct frame A, which is a composite structure of reinforced concrete and steel beams.

PC column 1 is the main bar 1 as shown in Figures 2 and 4.
The main reinforcing bars 1a protrude from the upper end of the PC column 1 on the upper side, and the lower end of the PC column 1 in order to interconnect with the main reinforcing bars 1a that protrude from the slab surface on the lower side. The main reinforcement insertion hole for the lower column is formed in the lower part of the PC column 1.

The steel beams 2 are adjacent as shown in Fig.
The steel beams 2, 2 which are installed between the PC columns 1 and 1 and which face each other on one PC column 1 are connected by a joining metal fitting 5 which is joined by spanning the flanges or webs of both sides.

FIG. 2 shows an example of the structure of the joint between the PC column 1 and the steel beam 2. As shown in the figure, a battledore bolt-shaped joint metal fitting 5 is straddled over the steel beams 2, 2 facing the upper side of the PC column 1. The upper and lower flanges are stacked on the upper and lower flanges of the steel beams and are protruded from the bottom so that they can be joined with bolts, connecting both steel beams 2, 2.

The PC pillar 1 is manufactured in one layer or several layers as shown in FIG. shows an example of manufacturing one layer, and shows an example of manufacturing two layers. In the case of this PC column 1, the joining hardware 5 is embedded in the steel beam 2 position in the PC column 1, and the steel beam 2 is connected to the PC column 1.
This is a type of joint that is butted against the side of the column 1.
In this case, a joining hardware 5' that joins the webs of the PC column 1 and the steel beam 2 is embedded in the side surface of the PC column 1, and both joining hardware 5, 5' are bolted to the flange and web of the steel beam 2, respectively. The steel beam 2 is joined to the PC column 1 by.

Furthermore, the fit between the steel beam 2 and the slab is as shown in FIG. 3, and the steel beam 2 is covered with a fireproof material 6.
A stud bolt 7 is connected on the flange,
Slab reinforcements 8, which are the upper end reinforcements of the slab, are arranged on top of this. The lower end reinforcement is embedded in the thin PC column slab 3.

Next, according to the embodiment of Fig. 1, one layer of PC pillar 1
The construction procedure will be explained.

First, erect PC column 1 at a predetermined position on the slab,
The main reinforcements 1a and 1a are connected to each other, and the PC column 1
Fill the lower end with mortar and connect it to PC column 1 on the lower floor ().

Next, the steel beams 2, 2 are erected, and the battledore part of the battledore plate-like joint metal fitting 5 and the upper and lower flanges of the steel beam are overlapped and connected with bolts, and the thin PC plate 3, which also serves as the floor formwork, is placed on top of the steel beam 2. Set to ().

Furthermore, slab reinforcements 8 are arranged on the thin PC plate 3,
Concrete 4 is poured on the thin PC board 3 and at the joint between the PC column 1 and the steel beam 2 (), completing one cycle of frame work.

As for the slab reinforcements 8 to be reinforced, since the lower end reinforcements are buried in the thin PC plate 3, only the upper end reinforcements are required, and it is preferable to arrange them in a mesh shape for convenience of reinforcement.

The above steps are repeated to construct the frame A and the structure.

〔Effect of the invention〕

The present invention is as described above, and the precast upper and lower columns are connected by connecting the column and beam with a joining hardware in the form of a battledore bolt that protrudes from the side of the column to which the main reinforcement is connected.
It is possible to use PC and steel beams, which simplifies the structure and makes it easier to transmit force to the columns and beams.
By using the PC version, construction becomes completely unsupported, which streamlines the construction process, making it possible to significantly shorten the construction period and reduce costs.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing the construction procedure of this invention, Figures 2- and 3 are cross-sectional views and vertical cross-sectional views showing the column-beam joint, respectively, and Figure 3 is a diagram showing how the beam and slab fit together. A vertical cross-sectional view showing , and Figure 4 is
FIG. 3 is a front view showing an example of manufacturing a PC column. A...Structure, 1...Precast concrete column, 1a...Main reinforcement, 1b...Stirrup bar, 2...Steel beam, 3...
Thin PC plate, 4... Concrete, 5, 5'... Joining hardware, 6... Fireproof material, 7... Stud bolt, 8... Slab reinforcement.

Claims (1)

[Claims] 1 At a predetermined position on the slab, construct a precast concrete column with a main reinforcement protruding from the upper end, a joint hole for the main reinforcement at the bottom, and upper and lower joint metal fittings shaped like battledore bolts projecting from the sides. The main reinforcement of the column and the main reinforcement of the column protruding from the top surface of the slab are connected to each other at the joint hole, the lower end of the column is filled with mortar and connected to the column on the lower floor, and the steel beam is inserted between the adjacent columns. After erecting the flanges of the steel beams and the battledore portions and connecting them with bolts, the opposing steel beams are connected to each other with joining hardware. Then, a thin PC plate is placed on the steel beams, and a thin PC plate is placed on top of the steel beams. A method of constructing a framework in which the framework is constructed by repeating the process of arranging slab reinforcements and pouring concrete.