JP2009191542A - Void slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve efficiency in arranging reinforcing bars in a void slab construction method. <P>SOLUTION: A lightweight embedding material comprises a void body having cross-shaped guide parts for bar arrangement formed on both of upper and lower faces. A plurality of the lightweight embedding materials are arranged at equal intervals. The reinforcing bars are arranged along the guide parts, and concrete is placed to obtain the void slab. Lower end bars are arranged and the lightweight embedding materials are arranged by the cross-shaped grooves of the guide parts formed on the lower faces. After that, upper end bars are arranged by the guide parts formed on the upper faces. Since the reinforcing bars are arranged between the guide parts, the lightweight embedding materials do not move upon placing the concrete. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention belongs to a hollow slab technology excellent in workability.

Various void construction methods have been proposed in which a lightweight embedding material is embedded in a concrete slab to make it hollow in order to increase the height of a building, secure a large room space, reduce weight, and improve sound insulation.
As the lightweight embedding material, a hollow tube such as a winding pipe, a box-shaped product obtained by bending a keystone plate, a water-resistant cardboard molded product, a foamed plastic molded product, and the like have been put into practical use.

Japanese Patent Laid-Open No. 2002-339496 discloses a method in which a large number of buried objects are arranged in a small space partitioned in a grid pattern by upper and lower bars arranged in a lattice form in a mold, and concrete is placed. Has been proposed. In this bi-directional slab method, a lightweight plastic foam body such as a dice or cylinder is used as the embedding material, and the embedding material is embedded in a small space regularly formed in a slab lattice to form a bi-directional slab. To do.

In Japanese Patent Laid-Open No. 2002-339496, a lattice-shaped bottom streak is placed in a formwork, a hollow spherical embedding material is disposed in a lattice part of the bottom streak, and then a top streak is disposed on the top of the embedding material. A slab construction method has been proposed in which concrete is placed in a mold after the upper end is fixed to the fixing tool.

Japanese Patent Laid-Open No. 2003-321894 discloses a lightweight spherical embedding that has a diameter that allows a small space partitioned into a grid pattern by upper and lower streaks to pass through the top of the small space and into one small space. The hollow concrete slab which fixes a buried object by arrange | positioning material and arrange | positioning a pressing metal from the upper end reinforcement is proposed. However, since the concrete slab is not fixed with the embedded material as in the above two cases, it may be displaced from a predetermined position by a strong flow during concrete placement, and the necessary concrete covering thickness cannot be secured. There was a problem.

Japanese Patent Laid-Open No. 2003-227200 proposes an embedding material unit for a hollow slab in which a lightweight embedding material can be divided into upper and lower parts, and at least one of the light-weight embedding materials divided up and down is connected by a connecting material. .

Japanese Laid-Open Patent Publication No. 2004-176309 proposes a void unit for hollow concrete arranged vertically and horizontally with a lightweight spherical embedded material sandwiched between lattice members arranged in parallel. Yes.

Japanese Patent Laid-Open No. 2006-257851 discloses an embedding material unit in which a plurality of embedding members arranged in a row and a reinforcing bar having a plurality of shafts standing upright at equal intervals are integrated. It proposes an embedding block attached to the shaft.

JP 2002-339496 JP JP 2002-339496 JP JP 2003-321894 JP 2003-227200 A JP 2004-176309 A JP 2006-257851 A

The present invention is a technique for improving the efficiency of bar arrangement in a hollow slab method.

The first aspect of the present invention is a hollow slab in which a plurality of hollow body lightweight embedding materials provided with cross guide portions for reinforcing bar arrangement on both upper and lower surfaces are arranged at equal intervals, and the reinforcing bars are arranged along the guide portion and laid with concrete. It is. Reducing the labor of bar arrangement and providing guides for bar arrangement on the upper and lower surfaces of the lightweight embedding material so that the lightweight embedding material does not move when placing concrete.
The second aspect of the invention is the hollow slab described above in which a liquid is sealed inside the light-weight embedding material. In order to absorb the shaking energy at the time of the earthquake, liquid was sealed inside the hollow body lightweight embedding material.

The first invention has the following effects because the guides for bar arrangement are provided above and below the lightweight embedding material in the hollow slab method. (1) The lightweight embedding material does not move when placing concrete. (2) Since there is a guide for bar arrangement, labor for bar arrangement work above the lightweight embedding material is reduced.
In the second aspect of the invention, since the liquid is enclosed in the lightweight embedding material, the energy at the time of the earthquake can be absorbed by the vibration of the liquid inside.

The first invention will be described below in detail with reference to the drawings.
FIG. 1 is a conceptual diagram showing an example of a lightweight embedding material used in the present invention.
In FIG. 1a, flat portions are provided on the upper and lower sides of a hollow sphere, and a cross groove is provided on the flat portion. FIG. 1 b shows the flat portion provided with a guide for reinforcing bar arrangement. Both of them constitute a cross reinforcing bar guide.
Since a guide part becomes a place which lets a reinforcing bar pass, it is preferable to make it wide and deep with respect to a reinforcing bar.
The lightweight embedding material is not limited to a hollow sphere, and a hollow rectangle, trapezoid, pipe, or the like can be used as appropriate.

FIG. 2 is a conceptual diagram showing an example of a hollow slab using the lightweight embedding material shown in FIG. 1a.
In the construction procedure, the lower end reinforcement is arranged in a grid pattern, and the arrangement for placing the lightweight embedding material in the middle is performed. The lower surface guide part of the lightweight embedding material is aligned with the crossing point of the reinforcing bar for placing the light embedding material, and then the bar arrangement work is performed in accordance with the upper surface guide part of the light embedding material. Perform construction. If necessary, tie the reinforcing bars together with a wire and place concrete.

According to the above procedure, the bar arrangement is arranged in the guide part of the lightweight carrying material, and the movement of the lightweight embedding member does not occur due to the strong flow at the time of pouring the concrete, and the bar arrangement work of the upper end bar is also performed. It can be easily performed by the guide part provided in.

The second invention will be described. As shown in FIG. 3, the liquid is sealed inside the lightweight embedding material. If necessary, liquid is sealed in an impermeable bag and placed in a lightweight implant. It is preferable to enclose the bag with a margin so that the encapsulated liquid flows in response to the vibration during the earthquake. The liquid to be sealed is preferably water or a liquid whose viscosity is increased by dissolving water glass or the like. It is also possible to enclose a sphere that moves due to earthquake vibration.
The use of a lightweight embedding material enclosing a liquid as a hollow slab is the same as in the first invention.

It is a conceptual diagram of the lightweight embedding material used for this invention. It is a conceptual diagram of the hollow slab of this invention. It is a conceptual diagram of the lightweight embedding material which enclosed the liquid.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lightweight embedding material 2 Guide part 3 Bottom muscle 4 Upper muscle 5 Liquid

Claims (2)

A hollow slab in which a plurality of hollow body lightweight embedding materials provided with cross guide portions for bar arrangement on both upper and lower sides are arranged at equal intervals, and bars are arranged along the guide portion and concrete is laid. The hollow slab according to claim 1, wherein a liquid or a sphere is sealed inside the hollow body according to claim 1.

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