JPH0366463B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a steel-framed reinforced concrete building, which is the most frequently constructed structural type of multi-story building of a certain height or more.

The frame of a general floor of a building with the above structural type is composed of columns, girders, small beams, floor slabs, walls, stairs, etc. Of these, the girders, small beams, and floor slabs make up the majority of the frame. . Large beams, small beams, and
When constructing a floor slab by concrete pouring, conventionally, as shown in FIG.
6 are used separately, supported by thick timbers 013 and a large number of pipe supports 09 standing in a forest, etc., and by assembling the necessary reinforcing bars and pouring concrete, the large beam 01 and the small beam 02 are constructed. , was constructing floor slab 03.

However, when such conventional methods are used, the materials used for formwork and shoring and the labor to assemble them are enormous, and the cost and time for this is a large proportion of the total construction cost and construction period. As a result, the formwork cannot be dismantled until a specified curing period (usually around 4 weeks) has passed after concrete is poured, and the materials used must be removed after the formwork dismantling work is completed. This added to the fact that subsequent finishing work could not be started unless the construction site was cleared and cleaned, which further extended the overall construction period. In addition, there was also the problem of increasing the risk of carrying in and out of huge amounts of materials, which required working at heights.

In view of these circumstances, the present invention aims to significantly shorten the construction period and improve construction accuracy by streamlining the materials used when constructing the large beams, small beams, and deck slabs that make up the majority of the construction work. The purpose is to propose a method for constructing a structure.

The gist of the method for constructing a steel-framed reinforced concrete building according to the present invention, which has been ingeniously devised to achieve the above object, is that when constructing the main structures of a steel-framed reinforced concrete building, such as the main beams, small beams, and floor slabs, Using cast concrete beams,
The floor slab formwork is constructed by laying corrugated concrete formwork on top of the temporary support beam group that spans the precast concrete small beams and the side formwork of the girder, and the floor slab formwork and the girder The purpose is to construct the floor slabs and girders by pouring concrete into the formwork.

That is, by using precast concrete beams, lifting them simultaneously with the erection of the steel frame, and attaching them to the joints of the girders, it is possible to eliminate the need for formwork and shoring when constructing the beams. Moreover,
Utilizing the sufficiently large bearing capacity of this precast concrete small beam as a permanent installation, this precast concrete small beam is used as a fulcrum for the temporary support beam of the floor slab formwork, and the temporary support beam is connected to the precast concrete small beam and the main beam. The pipe support for the floor slab formwork is constructed by constructing the floor slab formwork by constructing it across the side formwork and laying corrugated abandoned formwork such as keystone plates and deck plates on the temporary support beam group. This also eliminates the need for shoring.

In addition, only the small beams are precast, and the girders are cast in-situ together with the floor slabs, so for example, the girders are also made of precast like the small beams, and when the concrete is poured for the floor slabs, they protrude from the cast concrete and the girders. Compared to the case where the girder and floor slab are integrated by combining them with reinforced reinforcing bars and steel frames,
By connecting the concrete between the girder and the floor slab in a series, the concrete can be bonded to each other, and the strength of the bond between the girder and the floor slab can be increased.

As mentioned above, through the rational use of materials when constructing the main structures such as girders, beams, and deck slabs,
By saving labor and materials, it is possible to significantly shorten the construction period by significantly improving construction efficiency compared to conventional methods, and simplifying the overall construction by precasting small beams, which tend to be complicated work in on-site construction. This makes it possible to improve construction accuracy. In addition, since fewer materials are used, the risk of danger during lifting, assembly, and disassembly work is also reduced. Furthermore, while improving the construction efficiency and accuracy, the girder and the floor slab can be strongly connected and the frame can be made durable.

Hereinafter, embodiments of the method of the present invention will be described in detail based on the drawings.The main structure of a steel-framed reinforced concrete building is a steel-framed reinforced concrete girder 1;
In constructing the reinforced concrete beam 2 and the reinforced concrete deck slab 3, a precast concrete beam was used as the reinforced concrete beam 2, as shown in Figures 1 to 3. Lift the reinforcing bars at the same time as erecting them, and attach them to the joints of the girders.

Therefore, the precast concrete beam 2
and the side formwork 7A of the formwork 7 for making the girder 1 assembled in a state where it is supported by the pipe support 9.
A plurality of temporary support beams 4 made of lightweight prefabricated trusses or lightweight rectangular pipes are erected at appropriate intervals in the longitudinal direction of the small beams over the upper end of the temporary support beams. A corrugated (permanent) formwork 5 such as a keystone plate or deck plate is placed in the area surrounded by the formwork 7A and the precast concrete beam 2 on one side.
By laying the floor slab formwork 6, the floor slab formwork 6 is assembled and configured. Next, reinforcing bars 10a for the girder and reinforcing bars 10 for the floor slab
By placing concrete 11 in each formwork 6 and 7 after arranging b, the floor slab 3, girder 1, and precast girder 2 are assembled into a floor structure as shown in Fig. 5. Build the main structure.

The precast concrete beam 2 has a fourth
As shown in the figure, the height of the corrugated waste formwork 5, which is the formwork for constructing the floor, will be installed in advance below the top end of the ribs to a position corresponding to the position where the corrugated waste formwork 5, which is the formwork for constructing the floor, will be installed when it is attached to the girder 1. The reinforcing bars 10 that are exposed above the concrete are embedded in the concrete 11 that has been cast for making the slab, and are used as a bonding material with the slab 3. act.

Note that the temporary support beam 4 can be used repeatedly after being dismantled and removed. Regarding girder formwork 7, girder steel frame 1
If the formwork is suspended from 2, there is no need for shoring such as pipe supports, making the construction more economical and effective overall.

[Brief explanation of drawings]

The drawings show an embodiment of the method for constructing a steel-framed reinforced concrete building according to the present invention, and FIG. 1 is a plan view of the main parts showing the procedure for constructing a one-story frame, and FIGS. 2 and 3 are similar to FIGS. Fig. 4 is a perspective view of the precast concrete beam, Fig. 5 is an enlarged longitudinal sectional view of the main part after construction, Fig. 6
The figure is an enlarged vertical sectional view of the main parts showing the conventional method. 1...Large beam, 2...Precast small beam, 3...
Floor slab, 4... Temporary support beam, 5... Corrugated waste formwork, 6...
Floor slab formwork, 7... girder formwork, 7A... side formwork.

Claims (1)

[Claims] 1. To construct the main beams 1, 2 small beams, and floor slab 3, which are the main structures of a steel-framed reinforced concrete building, precast concrete small beams are used as the small beams 2, and these precast concrete small beams 2
and the side formwork 7A of the girder 1.
A corrugated waste form 5 is laid on top of the group to assemble the floor slab form 6, and concrete is poured into the floor slab form 6 and girder form 7 to form the deck slab 3 and girder 1. A method of constructing a steel-framed reinforced concrete building.