JPH0642184A - Construction of skeleton using half precast floor board - Google Patents

Abstract

PURPOSE:To reduce the extent of dangerous operations at scaffolding work as well as to shorten a term of work for constructing a skeleton. CONSTITUTION:In a method of constructing a skeleton 6 used with a half precast floor board 2, in the preceding state that a half precast floor board 2 is mounted on top of a half precast beam 7 and concrete 3 is palced in a working floor of the skeleton 6 a moving lifter 4 is mounted on the half precast floor board 2. Using this as a scaffold, execution of works for the skeleton 6 at an upper floor 5 is performed from the downside and, after the upper floor 5 has come to the same state as the working floor 1, the concrete 3 is placed on the half precast floor board 2 of the working floor 1.

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 skeleton using a half PC floorboard suitable for constructing a skeleton using a half PC floorboard.

[0002]

2. Description of the Related Art Generally, a beam and a half-PC (precast) floor plate placed on the upper surface of the beam are used as a floor structure of a frame.
A floor structure having a half-PC structure, which is composed of the half-PC floor plate and a concrete layer formed by placing the half-PC floor plate on the beam on an unmounted portion, is widely adopted.

The construction of the skeleton having such a floor structure is carried out by installing a beam, a half-PC floor board, etc., which has been carried into the working floor in advance from below, on the floor surface of each working floor where the construction work of the skeleton is carried out. By doing this, the construction work of the skeleton of the upper floors is performed, and this is repeated sequentially from the lower floors to the upper floors.

Conventionally, in each working floor, in order to construct the frame of the upper floor from below, a half PC floor board is placed on the beam, and a scaffold is half-Ped before the floor concrete is placed.
It is assembled on the C floor board, and on the scaffolding, the construction work of the skeleton on the upper floor above the working floor is performed. After this, floor concrete is placed on the half-PC floor board on the working floor, and the construction of the skeleton on the working floor is completed.

Further, as shown in FIG. 5, on the working floor 1, after the concrete 3 cast on the half PC floorboard 2 has a predetermined strength, it can be moved onto the floor surface 1a of the working floor 1, In addition, a worker or a building member is mounted in the vertical direction and an automatic lifting lifter (hereinafter, referred to as “moving lifter”) 4 that is freely movable up and down is placed, and the worker rises on the moving lifter 4 and the skeleton of the upper floor 5 There are also cases where the construction work of 6 is performed.
Construction of the skeleton 6 is performed by successively repeating the above-mentioned work to sequentially form the skeleton 6 to be constructed from the lower floor to the upper floor.

[0006]

However, in the method of constructing the frame using the conventional half PC floorboard as described above, there are the following problems. First, half PC
If scaffolding is installed on the half-PC floorboards before the concrete is placed on the floorboards, and the construction of the skeleton on the upper floors is to be performed, it is a scaffolding work, so the risk is high, and the scaffolding is assembled on each floor.・ Because dismantling is necessary, it takes time and labor, and the construction period becomes long.

Further, when the movable lifter 4 is placed and the frame 6 of the upper floor 5 is constructed, the moving surface of the movable lifter 4 is smooth in order to move the movable lifter 4 on the floor surface of the working floor. It is necessary to use the moving lifter 4 only after placing the concrete 3 on the half PC floorboard 2. Therefore, after placing the concrete 3 on each working floor, the construction of the skeleton 6 of the upper floor 5 cannot be started until the concrete 3 develops a predetermined strength,
There was a problem that the construction work of the skeleton 6 on the upper floors 5 was scattered and the construction period was prolonged. The present invention has been made in consideration of the above points, and a structure using a half-PC floorboard is constructed without using a scaffold, and a half-PC floorboard that can shorten the construction period is used. The purpose is to provide a construction method.

[0008]

The invention according to claim 1 is
A method of constructing a skeleton using a half PC floorboard, wherein, on the working floor of the skeleton to be constructed, after placing the half PC floorboard on the upper surface of the beam, the half PC floorboard is used as a scaffold or a place to install a scaffold, In addition, if necessary, another place such as the ground is used as a scaffold or a place to install the scaffold, and the skeleton of the upper floor of the working floor is constructed from below, and then the floor is placed on the half PC floorboard of the working floor. It is characterized by pouring concrete.

The invention according to claim 2 is the method according to claim 1, wherein a half PC beam is used as the beam, and the splicing top end portion of the half PC beam and the splicing portion of the half PC floor board are used on each floor. Is characterized by having the same height.

The invention according to claim 3 is the method according to claim 1, wherein the beam is formed by installing a formwork on site and pouring concrete, and after forming the beam, the beam is formed. Place a plurality of half-PC floor boards on the beam, and then use these half-P
A feature is that a temporary lining member is installed between the C floor plates so as to close the recess formed between these half PC floor plates.

[0011]

According to the first aspect of the present invention, in the working floor of the building to be constructed, after placing the half PC floor board on the upper surface of the beam, the half PC is placed before the floor concrete is placed.
As a place to install the scaffolding or scaffolding with the floorboard, and as another place, such as the ground, as a place to install the scaffolding or scaffolding, if necessary, construct the skeleton of the upper floor of the working floor from below, and after that The structure is constructed by placing floor concrete on the half-PC floor board on the working floor.

According to the second aspect of the present invention, when a half PC beam is used as the beam, the half P beam is used on each floor.
The joint top of the C beam and the joint of the half PC floor board
By having the same height, the surface formed by the half PC floor plate is a flat surface without protrusions.

According to the third aspect of the present invention, the beam is formed by installing a formwork on site and pouring concrete, and thereafter,
By installing a temporary lining member that closes the recess formed between the half PC floorboards between the plurality of half PC floorboards placed on the upper surface of the beam, the surface formed by the half PC floorboards has no protrusions. Let it be a plane.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. In these figures, portions common to FIG. 5 shown as a conventional example are denoted by the same reference numerals. First, for example, an example in which a half PC beam is used as a beam used for a frame to be constructed will be described. In the present embodiment, FIGS. 1 and 2 show a method of constructing a frame using a half PC floorboard according to the present invention and a structure of a frame to which this method of construction is applied.
As shown in FIG. 2, the floor structure 8 on each floor of the frame 6 to be constructed is such that, as shown in FIG. 2, the end portions of a plurality of half-PC floor boards 2 are placed on the half-PC beam 7, and the half-PC floor boards 2, 2, 2. ... is supported horizontally. Furthermore, concrete (floor concrete) 3 is cast on the upper surfaces of the half-PC beam 7 and the half-PC floor plate 2.

The half-PC beam 7 has a convex cross section and has a structure in which the shoulders 7a, 7a support the end of the half-PC floorboard 2. Further, the splicing top end portion 7b of the half PC beam 7 is formed to have the same height as the splicing portion of the surface 2a of the half PC floor plate 2 in a state where the half PC floor plate 2 is supported by the shoulder portion 7a. ing. On the half PC floorboard 2,
A large number of cotters 2b are formed on the surface 2a at a predetermined interval for the purpose of integrating the joint portion with the concrete 3 to be cast. For concrete 3, half PC floorboard 2
Reinforcing bars 9 are arranged along the lines.

FIG. 1 shows a state in which the skeleton body 6 to be constructed is under construction. The skeleton body 6 is provided with a plurality of columns (not shown) vertically at predetermined positions. A plurality of large beams (not shown) that support the respective floors of the frame 6 are horizontally provided at predetermined positions. Further, on the working floor 1 where the work is performed, half-PC small beams 7 are erected at predetermined intervals between large beams (not shown). Ends of a plurality of half-PC floorboards 2 are placed on the half-PC beam 7,
These half PC floor boards 2, 2, ... Are supported horizontally. In this state, since the splicing portion of the surface 2a of the half PC floorboards 2, 2, ... And the splicing top end 7b of the half PC beam 7 are at the same height, a surface without protrusions is formed. There is. That is, FIG. 1 has a structure to which the method for constructing a frame using the half PC floorboard according to the present invention is applied.

Next, a method for constructing the above-mentioned body 6 will be described. First, as shown in FIG. 1, on the working floor 1, a plurality of half-PC floor boards 2, 2, ... Are placed on a half-PC beam 7 which is erected at a predetermined position between girders (not shown). Next, the half PC floor board 2 on the upper floor 5 to be constructed, the half PC beam 7, and the steel beam, beam 7c, deck plate floor 2d, etc. of the top floor 5a are placed on the working floor 1, for example, a crane. And so on. Also,
A movable lifter (scaffolding) 4, which is movable in the horizontal direction in the working floor 1 and is vertically movable by mounting workers and building members, is carried onto the working floor 1.

Then, the movable lifter 4 is moved horizontally in the working floor 1 to lift the half PC beam 7 upward at a predetermined position, and is installed on the upper floor 5 one floor above the working floor 1. It will be installed at the specified position of the large beam (not shown). Next, the half PC floor board 2 is similarly lifted upward by the moving lifter 4 and the half P is erected on the upper floor 5.
Place it on the C beam 7. In this way, the upper floor 5 is in the same state as the working floor 1. After that, the movable lifter 4 is transferred from the working floor 1 to the upper floor 5, and the construction of the upper floor 5 is started.

Next, the reinforcing bar 9 is connected to the half PC on the working floor 1.
After arranging along the upper surfaces of the floor plate 2 and the half-PC beam 7, the concrete 3 is poured. As a result, working floor 1
Becomes a state in which the floor structure 8 shown in FIG. 2 is formed. By repeating the above work, the skeleton 6 can be constructed.

As described above, the half PC of this embodiment
In the method of constructing the skeleton 6 using the cross beam 7, the half PC is used in the state before the concrete 3 is placed on the working floor 1.
The joint top end portion 7b of the beam 7 has the same height as the joint portion of the surface 2a of the half PC floor board 2 supported by the shoulder portion 7a. As a result, the working floor 1 becomes a surface without protrusions, and the movable lifter 4 can be freely moved within the working floor 1.

Further, in the state before the concrete 3 is placed on the working floor 1 of the frame 6 to be constructed, the half PC is used.
The movable lifter 4 movable in the working floor 1 is placed on the floor board 2 as described above, and the movable lifter 4 is used as a scaffolding to construct the skeleton 6 of the upper floor 5 from below, and the upper floor 5 is in the same state as the working floor 1. After that, the skeleton 6 can be constructed by placing the concrete 3 on the half PC floorboard 2 of the working floor 1.

Next, as a beam used for the body to be constructed,
One example of the case where a formwork is installed on site and concrete is cast on the formwork to use a site-placed beam will be described with reference to FIGS. 3 and 4. In these figures, the parts common to those in FIGS. 1 and 2 used in the previous embodiment are designated by the same reference numerals and the description thereof is omitted. In the previous embodiment, the half-PC beam 7 was used for the skeleton 6, whereas in this embodiment, the on-site cast beam 13 is used. In this embodiment,
The floor structure 10 of the skeleton 6 to be constructed, as shown in FIG.
Ends of a plurality of half-PC floor boards 2 are placed on the on-site casting beam 13, and these half-PC floor boards 2, 2, ... Are supported in a horizontal state. Further, concrete 3 is cast on the upper surfaces of the on-site casting beam 13 and the half PC floor board 2.

A beam main bar 13a and a stirrup bar 13b are arranged on the on-site cast beam 13. Concrete 3
In, the reinforcing bars 9 are arranged along the half PC floor board 2.

Further, FIG. 4 shows a state of the working floor 1 in the process of construction, in which the supporting frame 14 supports the form 12 forming the on-site cast beam 13. Formwork 12
The ends of a plurality of half PC floor boards 2 are placed on the upper end of the half PC floor boards 2, and the half PC floor boards 2, 2, ... Are horizontally supported. In the recess 2c between the half PC floorboards 2, 2, ... Supported by the form 12, a temporary lining board 15 is supported such that both ends thereof are supported by the ends of the half PC floorboards 2, 2 ,. It is installed. The temporary lining plate 15 has a structure that covers the recess 2c. Here, the temporary lining plate 15 and the half PC
The surface formed by the splicing portion of the surface 2a of the floor plate 2 is
It is a flat surface without protrusions. That is, FIG. 4 shows a structure to which the method for constructing a frame using the half PC floorboard 2 according to the present invention is applied.

Next, a method of constructing the frame 6 using the on-site cast beam 13 will be described. First, as shown in FIG.
On the working floor 1, a plurality of halves P are mounted on the formwork 12 of the cast-in-place beam 13 erected at a predetermined position between the large beams (not shown).
Place the C floor boards 2, 2, .... Next, the half-PC floor board 2 of the upper floor 5 to be constructed, members such as the formwork 12, the site-casting beam 13, the support work 14, and the temporary lining board 15 are carried into the working floor 1 by, for example, a crane. . In addition, Example 1
In the same way as above, a moving lifter (not shown) is loaded onto the work floor 1. Then, the support work 14 is arranged at a predetermined position on the working floor 1, the members of the formwork 12 and the on-site casting beam 13 are lifted by the moving lifter, and the working floor 1
It is erected at a predetermined position of a large beam (not shown) provided on the upper floor 5 above the floor. Next, the beam main bar 13a and the stirrup bar 13b of the on-site cast beam 13 are arranged in the form 12, and concrete 16 is poured. Then half P
The C floor plate 2 is lifted upward by a moving lifter (not shown) and placed on the upper end of the erected formwork 12 as in the first embodiment. Further, the temporary lining plate 15 is installed in the recesses 2c of the half PC floor plates 2, 2, ... Supported by the formwork 12. In this way, the upper floor 5 is in the same state as the working floor 1. After that, the movable lifter 4 is transferred from the working floor 1 to the upper floor 5, and the construction of the upper floor 5 is started.

Next, after removing the temporary lining plate 15,
The reinforcing bars 9 are laid out along the upper surfaces of the half-PC floor board 2 and the on-site casting beam 13 on the working floor 1, and concrete 3 is poured. As a result, the working floor 1 has the floor structure 10 shown in FIG.
Is formed. By repeating the above work, the skeleton 6 is constructed as in the first embodiment.

The frame 6 using the on-site cast beam 13 of this embodiment
In the construction method, the temporary lining plate 15 is erected in the recess 2c between the half PC floor plates 2 in the state before the concrete 3 is placed on the working floor 1, and the surface 2 of the half PC floor plate 2 is laid.
The height is the same as a. This allows
The working floor 1 becomes a surface without protrusions, and the movable lifter 4 can be freely moved within the working floor 1.

Further, in the state before the concrete 3 is placed on the working floor 1 of the frame 6 to be constructed, the half P
After placing the movable lifter on the C floor board 2 and using it as a scaffold, the construction of the frame 6 of the upper floor 5 is performed from below, and after the upper floor 5 is in the same state as the working floor 1, the half of the working floor 1 The skeleton 6 can be constructed by placing the concrete 3 on the PC floorboard 2.

As described above, regardless of whether the beam used for the frame is the half-PC beam 7 or the site-casting beam 13, first, the movable lifter 4 is used without constructing a scaffold on the working floor 1. Since the skeleton 6 can be constructed by carrying out the work, it is possible to reduce the dangerous work in the scaffolding work, further reduce the scaffold assembling / disassembling process, and shorten the construction period. In addition, after the construction work of the upper floor 5 on the working floor 1 is completed, the moving lifter 4 and the like are raised to the upper floor 5, and immediately the construction work of the upper floor of the upper floor 5 is started. The concrete 3 can be placed. As a result, the work for constructing the skeleton on the upper floors 5 and the work for placing the concrete 3 can be performed in parallel, so that the construction period for constructing the skeleton 6 can be greatly shortened.

In the above embodiment, the half PC floorboard 2 and other members of the skeleton 6 can be lifted upward by the moving lifter 4 to construct the skeleton 6 on the upper floor 5, but within the working floor 1. Other materials may be used as long as they are movable and can safely carry the workers and members of the skeleton 6 from the work floor 1 to the upper floors 5 above. Further, after the members of the skeleton 6 such as the half-PC floor board 2 to be constructed are carried into the working floor 1, they are lifted up by the moving lifter 4 and placed on the half-PC beam 7 of the upper floor 5, If the members are heavy and cannot be lifted by the mobile lifter 4, they may be temporarily placed on the ground and lifted and carried directly to the upper floors 5 by a lift crane or the like using the ground as a scaffold to construct. Needless to say. Further, the cotter 2b formed on the half PC floorboard 2 can integrate the joint portion between the concrete 4 and the half PC floorboard 2 and has any shape as long as the wheels of the moving lifter 4 do not fit thereinto. It may be of a size. Furthermore, if there is room in the construction period, upper floor 5
In parallel with the construction of the frame 6, the underfloor piping / wiring work and the work for attaching the outer wall of the work floor 1 or under the work floor 1 such as an ALC plate may be performed.

[0031]

As described above, according to the method according to claim 1, the scaffolding or the scaffolding is installed on the half-PC floorboard before the floor concrete is placed on the working floor of the building to be constructed. As a scaffold or a place to install scaffolding on the ground, etc.
The skeleton can be constructed by constructing the skeleton on the upper floor from below and then placing the floor concrete on the half PC floorboard on the working floor. Therefore, first of all, since the construction work of the skeleton is carried out without assembling the scaffolding on the working floor, the dangerous work in the scaffolding work can be reduced, and the assembling / disassembling process of the scaffolding can be omitted and the construction period can be shortened. it can. In addition, immediately after the construction work of the upper floors on the working floor is completed, work on the construction work of the frame of the upper floor of the first floor of the above-mentioned upper floors should be started immediately, and should be carried out in parallel with the reinforcement work and floor concrete placing work on the working floor. You can This allows
Since the construction work of the skeleton of the upper floors is not divided by the operation of placing the floor concrete, the construction period of the skeleton can be significantly shortened.

According to the method of claim 2, in the state before the floor concrete is placed on the working floor, the half P
Since the joint top of the C beam and the joint of the half PC floorboard have the same height, the working floor can be a surface without protrusions, and the movable lifter can be freely moved within the working floor. It can be used as a scaffold to construct a skeleton.

According to the method of claim 3, in the state before the floor concrete is placed on the working floor, the half P
C Temporary lining boards are installed in the recesses between floorboards so that they have the same height as the surface of the half-PC floorboards, so the working floor can be made a surface without protrusions, and movable lifters can be freely used within the working floors. It can be moved to, and can be used as a scaffold to build the body.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an outline of a method of constructing a body using a half PC floorboard according to the present invention.

FIG. 2 is a cross-sectional view showing a floor structure using a half-PC girder according to the present invention.

FIG. 3 is a cross-sectional view showing a floor structure of a skeleton using a cast-in-place beam according to the present invention.

FIG. 4 is a cross-sectional view showing a process of constructing a skeleton using the on-site cast beam according to the present embodiment.

FIG. 5 is a cross-sectional view showing a method of constructing a skeleton using a conventional half PC floorboard.

[Explanation of symbols]

 1 Working floor 2 Half PC floorboard 3 Concrete (floor concrete) 4 Moving lifter (scaffolding) 5 Upper floor 6 Body 7 Half PC beam 13 Site cast beam 15 Temporary lining board

Claims (3)

[Claims] 1. A method of constructing a frame using a half-PC floorboard, wherein a scaffold or scaffold is placed on the half-PC floorboard after placing the half-PC floorboard on the upper surface of the beam on the working floor of the frame to be constructed. As a place to install the above, and as a place to install scaffolding or scaffolding on the ground, etc., if necessary, construct the skeleton of the upper floor of the working floor from below, and then half of the working floor. A method for constructing a skeleton using a half PC floorboard, which comprises placing floor concrete on the PC floorboard. 2. The method according to claim 1, wherein a half-PC beam is used as the beam, and the splicing top end portion of the half-PC beam and the splicing portion of the half-PC floor plate have the same height on each floor. A method for constructing a skeleton using a half-PC floorboard, characterized in that 3. The method according to claim 1, wherein the beam is formed by installing a formwork on site and pouring concrete, and after forming the beam, a plurality of halves are formed on the beam. A PC floorboard is placed, and then a temporary lining member is installed between these half PC floorboards so as to close the recess formed between these half PC floorboards. How to build.