JPS62141242A - Construction of concrete floor panel - 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 "Field of Industrial Application" The present invention relates to a method for constructing a concrete floor slab for a building without support.

``Conventional technology'' One of the methods of constructing concrete slabs is the so-called non-support construction method. This method of construction does not require maintenance work at the end of the formwork work or pedestals for shoring, and is extremely effective in streamlining on-site work and saving labor.

To explain an example of the conventional non-support construction method, first, we will start with a simple i-numbered housing located at the corner of a rectangle.
A plurality of beam trusses are laid across each side of a rectangle between the beams, which are erected to form a grid. Next, a plurality of floor trusses parallel to the passenger truss forming one of the two adjacent sides are bridged between the beam trusses forming the other side. Then, attach a bottom plate to each floor truss and the passenger truss parallel to it so that it is located below the lower chord member, and after spanning the formwork (for example, a plastic plate) between these bottom plates, A concrete slab will be poured on top of the concrete slab.

"Problems to be Solved by the Invention" The construction method described above not only streamlines on-site work, but also achieves high quality and precision by producing the bottom plate and formwork in a factory. However, even with this construction method, there was still room for consideration in the following points, for example.

■The bottom plate and formwork must be removed after the concrete slab has hardened.

■The strength of the formwork is insufficient when one grid is 9m x 9111 or more.

The present invention was made in view of the above circumstances, and its purpose is to further streamline and save labor on site work, and to create a new non-the-boat structure that achieves a high-strength deck structure with a small amount of material. Act (11 of concrete floor slabs)
The objective is to provide a method of building

"Means for Solving the Problems" In order to achieve the above object, the present invention provides (a) a plurality of passenger trusses arranged horizontally in a row substantially parallel to each other, and a lower chord member of each of these passenger trusses is one piece. (b) A plurality of floor trusses are lined up horizontally in a horizontal row, and the lower chord members of these floor trusses are placed inside a single precast concrete plate. (c) using a floor slab formwork which is buried in the floor truss and in which a hollow formwork structure is arranged along the extending direction of the floor truss on a precast concrete plate between each floor truss; , After constructing multiple beam forms parallel to each other between the columns, (d), installing floor slab forms between the beam forms, (e)
First, a concrete plate is placed on the beam formwork and the floor slab formwork.

"Function" According to the present invention, since the precast concrete plate integrated with the truss is used as the formwork, the strength is high, and
This formwork is manufactured in advance in a factory etc., and
There is no need to remove the concrete board even after it has hardened, making site work more efficient.

"Example" Hereinafter, an example of the present invention will be described in order of steps based on the drawings.

! , Factory production (a) In beam formwork manufacturing factories, beam formwork l as shown in Figures 1 and 2 is produced.
Manufacture. This beam formwork I has multiple Yanagawa trusses 2...
The lower chord members 2a of these beam trusses 2 are buried in a precast concrete plate 3, with the lower chord members 2a of the beam truss 2 arranged horizontally in parallel. On both side edges of the precast concrete plate 3, side wall portions 3a are erected along the extending direction of the riding truss 2. Na7;-i-Chuukyoho 1pu Urata soil 4suu r
As shown in the flute diagram, this is a combination of a lower chord member 2a, an upper chord +$2b parallel to this, and a radius member 2c that divides the space between them into triangular shapes. Further, reference numeral 4 in the figure is a mesh muscle.

(b) Manufacture of floor slab formwork Simultaneously with or before or after the above step (a), a floor slab formwork 5 as shown in FIG. 3 is manufactured. This floor slab formwork 5 is
Almost like the beam form 1, a plurality of floor trusses 6 are arranged in parallel, and their lower chord members 6a are buried in a precast concrete plate 7. Each floor truss 6 is almost the same as the passenger truss 2, in addition to the lower chord member 6a, the upper chord member 6b, and the lattice
It is equipped with C. However, the floor truss 6 is the passenger truss 2.
The height (distance from the lower chord member 6a to the upper chord member 6b) H is low, and it is formed small. And each floor truss 6
A formwork structure 8 is fixed between them. Formwork structure 8
is made of styrofoam, for example, and has the shape of a long box (hollow) extending along the extending direction of the floor truss 6 turned upside down.

11. On-site work process (c) Beam formwork installation process A plurality of beam formworks I manufactured in the above process (a) are installed parallel to each other between the houses 9 and 9 as shown in FIG.

The spanning direction at this time is the direction in which the dual-purpose truss 2 extends. However, in this embodiment, each column 9 has a steel formwork 10 attached around the reinforcing bars as shown in FIG. 6 (before concrete is poured), and the overall arrangement is to form a grid. It is erected. Therefore, the beam formwork l is supported by the steel formwork 10.

(d) Floor slab formwork installation step Between the plurality of beam formworks L and L constructed in the step (c) above, the plurality of floor plate formworks 5 and 5 manufactured in the step (b) above are・
- Bridge as shown in Figure 5. The spanning direction at this time is the extending direction of the floor truss 6, and both ends of the floor slab formwork 5 in the spanning direction are placed on the side walls 3a of the beam formwork 1 as shown in FIG. do.

(Po) Concrete plate casting process After the above process (D), mesh reinforcements 11 are laid on the passenger truss 2 and the floor truss 6 as shown in Fig. 7, and then the beam form l and A concrete plate 12 is placed on the floor slab formwork 5 as shown by the chain line in FIG.

In other words, if the concrete plate 12 hardens, it will become a concrete slab F1 as shown in Fig. 8, which means a beam formwork! , the floor plate formwork 5, and the concrete plate 12 are integrated to complete a floor slab. By the way, in the concrete slab F in the completed state, the part of the slab formwork 5 is the formwork structure 8...
Due to the presence of , a structure having a hollow portion S as shown in FIG. 9 is obtained. However, in FIG. 9, the reference numeral 13 indicates a void (a small formwork structure) arranged above the joint between the floor slab formworks 5.
It is.

In the above embodiment, the formwork structure 8 is attached to the floor slab formwork 5 at the factory, but it may be attached at the site.

"Effects of the Invention" As explained above, according to the present invention, beam formwork and floor slab formwork made of trusses and precast concrete are used, and after a plurality of beam formworks are spanned between columns, the beam formwork is By constructing a concrete slab by placing slab forms between the frames and pouring concrete on top of them, the following excellent effects can be obtained.

■Not only does floor skin maintenance and gantry work become unnecessary, but by producing beam formwork and floor slab formwork in a factory, it is possible to significantly reduce the labor involved in form work and reinforcing bar work. Furthermore, since both formworks become part of the concrete slab upon completion, there is no need to remove these formworks. In other words, on-site work is significantly streamlined and labor-saving, and the construction period can be shortened.

■The use of formwork that integrates the truss and pregeasted concrete provides the strength of a non-support formwork, and since these formworks are manufactured in a factory, the frame structure is highly precise.

Furthermore, the formwork structure makes the floor slab itself lightweight.

Therefore, it is also suitable when constructing a concrete slab for columns arranged to form a large grid, for example, a rectangular grid of about 110 m x 9.

■Since the beams can be made flat, the floor height can be lowered with the same ceiling height. In other words, the eave height of the entire building can be lowered, which is advantageous in terms of shade and diagonal line restrictions. Furthermore, since the beam height can be lowered, piping, ducts, etc. can be laid freely.

■Since it is possible to construct a floor slab with high in-plane rigidity, horizontal force during an earthquake can be easily transmitted to surrounding seismic walls. Therefore, it is possible to plan a large box structure surrounded by seismic walls,
It is very effective for changing partitions, etc., and allows for flexible layout planning.

[Brief explanation of drawings]

Figures 1 to 9 show an embodiment of the present invention in the order of steps. Figure 1 is a vertical cross-sectional view of a beam formwork, and Figure 2 is a
■ Linear view, Figure 3 is a cross-sectional view of the floor plate formwork, Figure 4 is a plan view explaining the process of constructing the beam formwork, and Figure 5 is a plan view explaining the process of constructing the floor plate formwork. Fig. 6 is a view taken along the line vt-vt in Fig. 5, Fig. 7 is a plan view explaining the process of placing a concrete plate, Fig. 8 is a perspective view showing the completed state of the concrete slab, and Fig. Figure 9 is a cross-sectional view of the completed concrete slab. ■・・・Beam formwork, 2・・・Beam truss, 2
a, 6a...Bottom chord material, 3.7...Precast concrete slope, 5...Floor slab formwork, 6
...... Floor truss, 8... Formwork structure,
9...Column, 12...Concrete plate.

Claims (1)

[Scope of Claims] A method for constructing a concrete slab in which a plurality of columns are arranged so as to be located at substantially corners of a rectangle and supported by these columns includes the following (a) and (b). , (C), (D), and (E). (a) A process of manufacturing a beam formwork in which a plurality of beam trusses are arranged horizontally in a row and substantially parallel, and the lower chords of these beam trusses are buried in a single precast concrete board. (b) A plurality of floor trusses are arranged horizontally in a row almost parallel to each other, the lower chord of these floor trusses is buried within a single precast concrete board, and the precast concrete board between each floor truss is A process of manufacturing a floor slab formwork on which a hollow formwork structure is arranged along the extending direction of the floor truss. (c) A step in which a plurality of beam forms are laid parallel to each other between the columns. (d) After the step (c) above, the step of installing the floor slab formwork between the beam forms. (e) After the step (d) above, a step of placing concrete plates on the beam formwork and floor slab formwork.