JP2001032376A - Floor slab frame and construction method for skeleton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a time required for construction of a steel encased reinforced concrete building or a reinforced concrete building, and to make it possible to construct a skeleton from the air for the reinforced concrete building. SOLUTION: This floor slab frame 10 installed in the air includes a plurality of column steel frames 12 erected in the ground and a plurality of girders 14 of steel frames supported by the steel frames or of precast concrete members. The skeleton of a building forms a part of the floor slab on the floor slub frame 10, and a part of the skeleton of the building is constructed with the part of the floor slab as a scaffolding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a frame of a steel reinforced concrete structure or a reinforced concrete structure, particularly a high-rise building, and a structure of a frame for a floor slab applied to the method.

[0002]

2. Description of the Related Art Conventionally, in order to shorten the period required for building a high-rise building made of steel-framed reinforced concrete, a frame for a floor slab has been provided in the air, and the building of the building has been promoted from both the frame and the ground. Is being done.

[0003] The frame for floor slab is constructed by erection of a plurality of steel frames for columns on the ground and forming a plurality of girders between the steel frames for columns.

The girder is formed by joining a steel girder to the column and then installing a temporary scaffold using the steel girder as a supporting means, thereby providing reinforcement and forming around the steel girder. This is done through work such as arranging frames, placing concrete, and dismantling the temporary scaffold after concrete curing.

[0005] Therefore, if these operations can be made unnecessary, it is considered that the time required for building the building can be further reduced.

[0006] Further, for a reinforced concrete building that does not have a steel beam for a girder required to support the temporary scaffold or formwork in the air, it was impossible to construct a frame from the air.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the time required for building a steel reinforced concrete building or a reinforced concrete building. Another object of the present invention is to make it possible to construct a reinforced concrete building from the air.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a structure of a floor slab frame provided in the air for construction of a steel reinforced concrete building or a reinforced concrete building frame, comprising a plurality of ground slabs. It includes a steel frame for a column and a plurality of girders made of a steel frame or a precast concrete member supported by the steel frame. The frame for the floor slab,
Further, it may include a plurality of small beams made of a steel frame.

In the frame of the building, a plurality of steel frames for columns are erected, and a plurality of girders made of a steel frame or a precast concrete member are joined to the steel frames for the columns, whereby a frame for a floor slab is constructed in the air. Then, a part of the floor slab is formed on the floor slab frame, and a part of the frame of the building can be constructed using the part of the floor slab as a scaffold.

[0010]

According to the present invention, according to the present invention, a frame for a floor slab provided in the air for constructing a frame of a steel reinforced concrete building is constituted by a steel beam or a precast concrete member.
Installation of temporary scaffolds required for forming girder beams, which are constituent members of the conventional frame for floor slabs, reinforcement arrangement around steel beams for girder beams, arrangement of formwork, concrete placement, and temporary provision after concrete curing Eliminates work such as dismantling of scaffolds and the labor and time required for these works. Therefore, the period required for construction of steel reinforced concrete buildings (construction period)
Can be reduced.

[0011] As for the small beam, the time and labor required for forming the small beam can be reduced by forming the small beam from a steel frame, similarly to the large beam.

In the construction of the frame of the reinforced concrete building, since the frame for the floor slab including the steel frame is a part of the frame, the frame is constructed in the same manner as in the steel reinforced concrete building. The frame can be constructed in a short time and with a small amount of labor, and the frame of the building can be constructed using the frame as a scaffold.

[0013] In either the steel reinforced concrete building or the reinforced concrete building, a part of the floor slab is formed on the frame for the floor slab, and a part of the frame of the building is formed using the part of the floor slab as a scaffold. Can be built.

[0014]

DETAILED DESCRIPTION OF THE INVENTION Referring to FIG. 1, a frame for a floor slab of the present invention is indicated generally by the numeral 10.

The floor slab frame 10 is constructed in the air in order to construct a frame of a multi-story building (usually a high-rise building) made of steel reinforced concrete or reinforced concrete. The floor slab frame 10 will later become part of the building.

By constructing the frame 10 for floor slab, the construction of the frame of the building can be simultaneously advanced from both the frame for floor slab and the ground. Thereby, the period required for building the building can be shortened as compared with the case where the building of the building is advanced only from the ground.

The floor slab frame 10 is constructed arbitrarily as part of a story of the building, for example as part of a story located at half the height of the building. If necessary,
The two floor slab frames 10 are spaced apart from each other by 2
It can be constructed as part of the above hierarchy.

The frame 10 for the floor slab is ground (not shown)
And a plurality of girders 14 disposed between the steel frames 12 and supported by the steel frames 12.

The column steel frame 12 is buried in concrete cast later to form columns of the building, and forms a reinforcing material for the concrete together with a reinforcing bar arranged around the column steel frame 12. The column steel frame 12 is made of, for example, an H-section steel. As a temporary steel frame, a steel column for a reinforced concrete building having a smaller cross section than a steel column for a steel reinforced concrete building can be used. The temporary steel frame may be buried in concrete later, and may be used as a part of a main reinforcement of a pillar of the reinforced concrete building.

In addition, the above-mentioned building is not limited to a single structural system made of a steel-framed reinforced concrete structure or a reinforced concrete structure, and the lower portion and the upper portion thereof are substantially different from each other with respect to the frame 10 for the floor slab. The structural type, for example, the lower portion and the upper portion may be made of a steel reinforced concrete structure and a reinforced concrete structure, respectively.

The girder 14 is made of a steel frame such as an H-beam or a precast concrete member (not shown).

The girder 14 can be formed by lifting the steel frame or the precast concrete member to a required height position by using a crane (not shown), and joining the steel frame or the precast concrete member to the steel frame 12 for the column.

The precast concrete member is made of steel reinforced concrete, steel frame concrete, or reinforced concrete. The steel frame reinforced concrete or steel frame precast concrete member can be joined by fixing a part (not shown) of a steel frame projecting from both ends to the column steel frame by welding, bolting, or the like. Further, the precast concrete member made of reinforced concrete can be joined to the steel frame for columns via plates (not shown) which are embedded at the time of molding and project from both ends thereof. These precast concrete members have an upper portion of a reinforcing bar (upper reinforcing bar) and / or an upper portion of a steel frame exposed in order to achieve integration with a floor slab formed on the girder 14 by casting concrete.

By forming the girder 14 of the frame 10 for floor slabs with the steel frame or the precast concrete member, the provision of a temporary scaffold, which is indispensable when the girder 14 is made of steel reinforced concrete by cast-in-place concrete. Reinforcement around the steel frame, arrangement of the formwork, support members of the formwork, concrete casting, dismantling of the temporary scaffolding after concrete curing, etc. become unnecessary, and therefore, the construction of the building of the building and the construction Work period can be further shortened. In addition, the construction cost of the building can be reduced by eliminating the need for these temporary materials, formwork materials, labor and time associated with unnecessary work.

Further, it is possible to shorten the construction period of a reinforced concrete building, which has been impossible until now.

Also, when the small beams 16 are arranged between the large beams 14, the small beams can be made of a steel frame such as an H-section steel or the precast concrete member, similarly to the large beams 14. The beam 16 made of the steel frame or the precast concrete member is also used for forming a temporary scaffold, arranging reinforcement around the steel frame for the beam, placing a formwork, placing concrete, and curing the concrete. There is no need to dismantle temporary scaffolds.

The construction of a part of the frame on the floor above the floor slab frame using the floor slab frame 10 as a base can be performed as follows. In addition, the steel frame 12 for each pillar erected for the construction of the frame of the upper hierarchy,
It has a height dimension slightly higher than the level defined by the floor slab frame 10.

First, for example, a deck plate 18 is bridged over the girders 14 and the small beams 16 of the frame 10 for floor slab, leaving a space around each steel frame 12 for columns, and necessary reinforcing bars are placed on the deck plate 18. Then, a part of the floor slab 22 is formed by placing the concrete 20. Instead, a half-precast concrete plate (not shown) is laid over the girders 14 and the small beams 16, and necessary reinforcing bars are arranged on the half-precast concrete plate as in the deck plate, and concrete is struck. By arranging, a part of the floor slab can be formed.

The space around each pillar steel frame 12 is covered with a bowl-shaped closing plate 23 in contact with each deck plate 18. The closing plate 23 is placed and fixed on four large beams 14 connected to the respective steel columns 12, and the steel columns 12 pass through the central portion thereof. The closing plate 23 is also used for the floor slab 2.
Part 2 acts as a weir plate that defines its thickness.

The closing plate 23 is later provided with the frame 10 for the floor slab.
Is removed at the time of concrete casting to simultaneously form the pillars of the floor immediately below and the remaining part of the floor slab 22.

After the concrete 20 has solidified, the floor slab 22
After the arrangement of the formwork used to form the upper half of the girder 24, the small beam 26, the floor slab 28, and the column 30 of the immediately upper layer made of cast-in-place concrete as the working floor, The formwork can be supported on the work floor 22 with a plurality of supports 32.

When the structure of the floor above the floor slab frame 10 is made of steel reinforced concrete, after the construction of the floor slab frame 10, a column steel frame (not shown) is further added to the upper end 42 of the column steel frame 12. Add to it. In addition to the installation and reinforcement of the formwork, prior to these, a steel beam for a large beam is joined to the steel frame 12 for a column, and a steel beam for a small beam is joined to the steel frame.

In the figure, the formwork includes a part 34 of the formwork that supports the upper half of the column 30 at its lower end after curing of the cast-in-place concrete, and a part of the formwork that supports the girder 24 at its lower end. All but 36 have been removed. Here, reference numeral 38 is
4 shows a support plate for a support 32 supporting a part 34 of a formwork, which is arranged on a blocking plate 23 so as to be bridged over two beams 12 adjacent to each other. Reference numeral 40 is
FIG. 2 shows a column reinforcing bar extending upward from a substantially middle level of a story defined by the floor slab frame 10.

The steel frame 1 for pillars built on the ground
2 is preferably reinforced with a temporary brace (not shown) and connected with a temporary beam so as to be able to resist horizontal force due to earthquake load, wind force and construction load applied thereto. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a frame for a floor slab of the present invention and large beams, small beams and floor slabs immediately above the frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Frame for floor slab 12 Steel frame for pillar 14 Large beam 16 Small beam 22 Floor slab

Claims (3)

[Claims] 1. A floor slab frame structure provided in the air for the construction of a steel reinforced concrete building or a reinforced concrete building frame, comprising: a plurality of steel frames for columns built in the ground; A plurality of girders made of a steel frame or a precast concrete member supported on the slab. 2. The floor slab frame according to claim 1, further comprising a plurality of steel beams supported by the girders. 3. A method for constructing a skeleton of a steel reinforced concrete building or a reinforced concrete building, wherein a plurality of pillars are erected, and a plurality of girders made of a steel frame or a precast concrete member are mounted on the pillar steel skeleton. Joining, thereby, constructing a frame for the floor slab in the air, forming a part of the floor slab on the frame for the floor slab, part of the frame of the building using a part of the floor slab as a scaffold A method for constructing a skeleton, comprising constructing a frame.