JPS621954A - Construction of housing of building - 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] (j) 'J, /11゜ [Industrial Application Field] This invention relates to a method of constructing a building frame in which the frame floor portion of the building is a concrete slab, and in particular relates to a method for constructing a building frame in which the frame floor portion of the building is a concrete slab. Suitable for construction of high-rise buildings.

[Conventional technology and its problems]

Even in high-rise buildings and super high-rise buildings, buildings with economical cross-sections are designed using composite columns and unbonded prestressed concrete IJ-) slabs (hereinafter referred to as unbonded PC slabs) instead of conventional steel-based frames. It has been done.

However, in the method of building sequentially from the lower floors, the formwork for pouring concrete on the floor must be assembled and dismantled.

It takes time to move, requires a lot of temporary materials, and requires a lot of man-hours, so the waiting time for work becomes long.

Furthermore, when constructing a flat slab structure for a low-rise building, a construction method is known in which several floors of slabs are formed on the ground and lifted up, but this method is difficult to apply to high-rise buildings.

This invention aims to solve the above-mentioned problems.

[Means for solving problems]

The construction method of this invention is to construct the floor frame 5 sequentially from the upper floor to the lower floor. First, the center core 1 is constructed first, and then the column steel frame 2 outside the center core 1 is constructed to a predetermined height. I'll start it up and go.

The center core 1 is a part where the elevator room, machine room, etc. are concentrated, and the concrete work of the wall part can be performed using the sliding form method or the jumping form method. Also, pillar steel frame 2 is under construction.
It is connected to the center core 1 using a temporary horizontal brace 3 and then started up.

Next, a temporary stage 4 is assembled on top of the erected steel column 2 so as to surround the center core 1. The temporary stage 4 is composed of a steel frame 4a, a formwork 4b provided on the steel frame 4a, etc., and is made to be able to slide by resting on the center core 1 and the column steel frame 2.

Next, after performing the necessary reinforcing work on the temporary stage 4, the floor concrete is poured, and the temporary stage 4 is moved to 1.
The building will be lowered one floor at a time and the concrete floor for the lower floors will be poured. Note that the slab formed on the temporary stage 4 is not limited to a flat slab, and may be a dyed slab or the like.

As described above, the center core 1, the column steel frame 2, and the floor frame 5
When a frame is formed, and the columns are composite columns such as steel reinforced concrete columns, reinforcing and concrete work around the column steel frames 2 are then performed.

In addition, if the building has many floors, the above work is divided into two or more heights, and the center core 1 is constructed in advance, the column steel frame 2 is erected, and the temporary stage 4 is used to move from the upper floor to the lower floor. The work of forming the floor frame 5 will be repeated.

〔Example〕

Next, the illustrated embodiment will be described.

Figure 5 is a plan view of the frame during construction, and Figure 6 is a cross-sectional perspective view showing the structure of the columns and floor. A floor frame 5 of unbonded PC slabs supported by composite columns made of steel-framed reinforced concrete is formed.

The floor frame 5 consists of a floor slab 5a portion and a beam 5b portion,
Floor reinforcing bars 11 made of lattice reinforcing bars, unbonded P in the form of catenary lines
C strand 12 and beam reinforcing bars 13 are arranged. In addition, for columns, column reinforcing bars 1 such as hoop bars, spiral bars, etc. are placed around the column steel frame 2 as main bars in the vertical direction and as shear reinforcing bars.
0 is placed and concrete 7 is poured.

Figures 2 to 4 show an example of the temporary stage 4, in which a steel frame 4a is constructed of steel frames such as H-shaped steel, and a formwork 4b is provided on top of the steel frame 4a. As shown in FIGS. 3 and 4, fixing to the column steel frame 2 can be carried out by bolting to joint plates attached to each floor. In addition, holes 8 for pouring concrete are formed in the formwork 4b of the temporary stage 4 at the column positions, so that the column steel frame 2 and the reinforced concrete 1 can be combined to form a composite column. .

The off-line diagrams to nine diagrams in total show another embodiment in which the temporary stage 4 is suspended by a center hole jack 14 installed at the top of the steel column 2. In this example, four center hole jacks 14 are prepared for each column steel frame 2, and the temporary frame 4a of the temporary stage 4 is suspended and supported via a wire rope 15.

When constructing the floor concrete, the temporary stage 4 is supported from below via jacks 17 on a receiving metal fitting 16 fixed to the column steel frame 2 with bolts or the like. To suspend the temporary stage 4, remove the bracket 16 and jack 17, gradually lower it by operating the center hole jack 14, and install it on the bracket 16 and jack 17 at the lower floor position. In addition, 18 in the figure is a wire guide.

In addition, the temporary stage 4 can be supported by the center core 1 in the same way, and by preparing an embedded pole I for mounting a bracket on the wall of the center core 1, one or more Using the center hole jack 14, the lifting work is carried out at the same time.

Figures 1 (a) to (g) show, as an example, the construction of a 48-story skyscraper using the present invention, and the work is carried out in the following steps.

■ Build the center core 1 to a predetermined height using the sliding form method or the jumping two-ohm construction method (see Figure 2.1 (a)).

■ Erect the column steel frame 2 and assemble the temporary stage 4 at the floor position of the 18th floor (see Figure 1 (+)). The column steel frame 2 is connected to the center core 1 by a temporary horizontal brace 3, and after the reinforcement is arranged on the 18th floor, the floor concrete is poured.

- Lower the temporary stage 4 by one floor (see Figure 1 (C)) and construct the floor tank 5 on the 17th floor.

■ From now on, repeat the same operation up to the 4th floor (Fig. 1 (d)
reference). As for the low-rise part 6 of the fourth floor and below, erection is carried out from the bottom as in the past, and the work for this part is carried out in parallel. Also, during this time, the center core 1 is constructed further upward.

■ Temporary stage 4 with pillar steel frame 2 raised upwards and dismantled
was moved to the floor position on the 32nd floor (see Figure 1 (e)),
Floor tanks 5 will be constructed sequentially from the 32nd floor to the 19th floor. At the same time, concrete columns are sequentially placed upwards from the fourth floor to form composite columns, and the construction of the center core 1 upwards is completed.

■ Move temporary stage 4 to the roof slab position (1 stage in total)
(See Figure (f)), the floor tanks 5 will be constructed sequentially up to the 66th floor.

At the same time, concrete columns IJ-1- will be cast from the 19th floor, and composite columns will be sequentially formed upwards, and installation of curtain walls will begin upwards from the lower floors.

■ Complete all structural work (see Figure A-1 (g))
, continue work on the curtain wall.

In the work mentioned above, it is assumed that the construction speed of center core 1 will be one floor per day, the construction of floor tank 5 will be one floor in five days, and the construction of column concrete will be one floor in two days. Therefore, the construction of the floor tank 5 and the construction on the upper floor of the center core 1, and the construction of the floor rack tank 5 and the construction of column concrete on the lower floor, etc. can be performed in parallel.

〔Effect of the invention〕

■ Since the temporary stages assembled on the upper floors are used repeatedly, fewer temporary materials are required, making it economical.

■ Temporary stages can be moved without being dismantled, reducing work effort and saving labor.

■ There is less work to do while waiting for the concrete to harden.
Parallel work can significantly shorten the construction period.

[Brief explanation of drawings]

Figures 1 (a) to (g) are front views showing the construction procedure in one embodiment of the present invention, two figures in total are bottom views of the steel frame of the temporary stage, and figures 2 and 5 are two figures - ■ Cross section, sword/
Figure 4 is a 1-If sectional view of Figure 6 in total, Figure 5 is a plan view during construction, Figure 6 is a cross-sectional perspective view showing the structure of the floor and column parts, and Figure 7 is a cross-sectional view of another example. Figure 8 is a front view of the main parts, Figure 8 is a side view, and Figure 9 is a plan view. 1...Center core, 2...Column steel frame,
3...Horizontal brace, 4...Temporary stage, 4a...Steel frame, 4b...
・Formwork, 5...Floor tank, 5a...Floor slab, 5b...Beam, 6...Low-rise section, 7
......Column concrete, 8...Hole for pouring column concrete, 9...Joining plate, 10
......Column reinforcing bars, 11...Floor reinforcing bars, 12.
...Unbonded PC strand, 13...
・Beam reinforcing bar, 14... Center hole jack,
15... Wire rope, 16... Bracket, 17... Jacket, 18... Wire guide. Figure 1 (a) Figure 1 (b) Figure 1 (C) Figure 1 (d) Figure 1 (e) Figure 1 (f) Figure 1 (9) Figure 2 Figure 3 Figure 4 figure

Claims (3)

[Claims] (1) The center core is constructed first, and then the column steel frames outside the center core are erected to a predetermined height, and a temporary stage that can slide along the column steel frames is placed at the center on top of the erected column steel frames. A building frame construction method characterized by assembling the core so as to surround it, and successively pouring floor concrete for the lower floors onto the temporary stage while lowering the temporary stage one floor at a time. (2) The building frame construction method according to claim 1, wherein the column steel frame is erected while being connected to the center core by a temporary horizontal brace. (3) The method of constructing a building frame according to claim 1 or 2, wherein the temporary stage comprises a steel frame and a formwork provided on the steel frame.