JP2004100383A - Construction method for void slab effectively utilizing remaining material of form plywood - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reuse resources, contribute to the solution of an environmental problem by recycling industrial waste and reduce the cost of the disposal of the industrial waste by effectively utilizing a remaining material of form plywood hard to be disposed of. <P>SOLUTION: In this construction method for a void slab effectively utilizing the remaining material 22 of the form plywood, in which the slab is constructed by embedding a form 2 for a void serving as the void in concrete, a form 1 for the slab is arranged; a lower reinforcing bar 3 is arranged in the form 1; the form 2 which is manufactured in such a shape as to correspond to the void by utilizing the remaining material 22 is installed in the form 1 via a gap member 21; an upper reinforcing bar 31 is arranged in the form 1; the concrete is placed in the form 1; and the form 2 is embedded in the concrete. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention is suitable for environmental symbiosis and aims to recycle materials, and produces void formwork by reusing formwork plywood remaining material that is discharged in large quantities and is difficult to dispose of, and buried in concrete. And a method of constructing a void slab.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, formwork plywood residue has been discharged in large quantities and attempts have been made to reuse it. However, there is no problem in removing the adhesive when the remaining formwork plywood is used as a fertilizer, and there is no good solution for manufacturing a board as a chip, such as high manufacturing costs. Also, incinerating the remaining formwork plywood wastes greenhouse gases and wastes resources, and requires enormous costs for disposal.
[0003]
Recently, the Law Concerning the Promotion of Effective Use of Resources (the Law for Promotion of Effective Use of Resources), the Law Concerning the Recycling of Materials Related to Construction Work (the Construction Recycling Law), and the Law Concerning the Procurement of Environmental Goods by the National Government ( The Green Procurement Act, etc., regulate environmental protection and promote the effective use of resources, and international environmental protection measures have been taken. In order to cope with such a movement, there is a problem in processing of formwork plywood residual material.
[0004]
For slabs of reinforced concrete buildings and apartment houses, void slabs are widely used in which a plurality of hollow portions are provided at the center to reduce the weight per unit volume. For example, as shown in FIG. 4, a void slab is constructed by arranging styrofoam material (foam resin material) b as a void form a at a large number of required locations at predetermined intervals. However, the styrofoam material b has a risk of generating harmful gas in the event of a fire, has a problem in waste disposal, and is expensive. In addition, the void form a of the styrofoam material b is more easily broken in a vibrator operation at the time of placing concrete, as compared with the void form of remaining formwork plywood. Also, when the styrofoam material b is fixed, the holding force of the nail or adhesive is weak, and in order to withstand the buoyancy of the void form a and firmly fix it, the void fixing crease c is stretched over the entire slab. They have to go around, causing a lot of effort and cost. This void fixing crease c is for fixing the void form a of the styrofoam material b, not the structural reinforcing bar.
[0005]
[Object of the invention]
<A> The present invention has been made in view of the above-described conventional problems, and has as its object to effectively utilize the remaining formwork plywood that is difficult to dispose of and to reuse resources. .
<B> Another object of the present invention is to contribute to environmental problems by recycling industrial waste and reduce the cost of treating industrial waste.
<C> The present invention is to cope with the reuse of wood according to the Construction Recycling Law, which was implemented from May 2002.
<D> Further, the present invention is to use the remaining material of the formwork plywood for the void slab, to facilitate the manufacture and handling, and to greatly reduce the cost.
[0006]
[Means for Solving the Problems]
In order to achieve the object as described above, the present invention is a method for constructing a void slab, in which a slab is built by embedding a void formwork to be a void in concrete, and a formwork plywood residual material is effectively used. Placing the slab formwork, arranging the lower reinforcement in the slab formwork, and using the formwork plywood remaining material, the void formwork made into a shape corresponding to the void is placed in the slab formwork. It is characterized by installing an upper reinforcing bar in the slab form, placing concrete in the slab form, and embedding the void form in the concrete. And a method for constructing a void slab by effectively utilizing the remaining formwork plywood.
Further, the present invention provides the method for constructing a void slab that effectively utilizes the remaining formwork plywood, wherein the gap member is fixed to the slab formwork, the void formwork and the nail by a nail. There is a method of constructing a void slab that makes effective use of plywood residue.
Further, the present invention provides the method for constructing a void slab effectively utilizing the remaining formwork plywood, wherein at the time of placing concrete, a vibrator is used to provide an air vent hole at a lower portion of the void formwork, and the concrete is voided. A method for constructing a void slab that effectively utilizes the remaining formwork plywood, characterized in that it is easily wrapped around the lower part of the formwork.
Further, the present invention is a method for constructing a void slab, in which a slab is constructed by embedding a void formwork to be a void in concrete, and effectively utilizing the formwork plywood residual material, wherein the slab formwork is disposed, Arrange the lower rebar in the forming form, cast the lower concrete in the slab form, and use the remaining material of the formwork plywood on the lower concrete to form the void corresponding to the void Construction of void slabs that make effective use of remaining formwork plywood, characterized by placing the formwork directly, arranging the upper rebar, casting concrete, and embedding the void formwork in the concrete. In the way.
In addition, the present invention provides the method for constructing a void slab that effectively utilizes the remaining formwork plywood, wherein the void formwork is fixed to the lower concrete with an adhesive, and the formwork plywood remaining material is effectively used. It is in the construction method of the void slab used.
Further, the present invention is a method for constructing a void slab, in which a void formwork to be a void is embedded in concrete to construct a slab, and a void slab is effectively used by using the remaining formwork plywood. A void formwork made in a shape corresponding to the void using the formwork plywood remaining material is installed on the top, the upper rebar is arranged, concrete is poured, and the void formwork is placed in concrete. A method of constructing a void slab, which effectively utilizes the remaining formwork plywood, characterized by being buried in a slab.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0008]
<a> Void slab that effectively uses formwork plywood residual material A void slab that makes effective use of formwork plywood residual material is a reinforced concrete slab in which a void (cavity) formwork made of formwork plywood residual material is embedded. It is. As shown in FIG. 1 (B), for example, the void slab that effectively utilizes the formwork plywood remaining material has a void formwork 2 made of the formwork plywood remaining material embedded between the lower concrete 4 and the upper concrete 41. It is a structure arranged.
[0009]
<B> Void Formwork The void formwork 2 is formed, for example, in a rectangular parallelepiped shape by recycling the formwork plywood remaining material 22. As shown in FIGS. 2 and 3, for example, the void formwork 2 uses a plurality of plywoods made of formwork plywood residual material 22 for a bottom plate, a side plate, and an upper plate. To reinforce. The inside of the void form 2 is hollow. For example, as shown in FIG. 2, an air vent hole 24 is provided in the lower part of the void form 2 as required. With the air vent hole 24, when the concrete goes around the lower part of the void form 2 in the conventional method, the concrete can easily go around the lower part of the void form 2.
[0010]
The size of the void form 2 is set to an appropriate size corresponding to the required thickness and span length of the void slab. The formwork plywood residue 22 is lightweight and has good workability, and can be easily processed to a required size.
[0011]
The formwork plywood residue 22 is a plywood or a pier of a used concrete formwork, and is a residue generated when the formwork is processed. The formwork plywood residue 22 is discharged in large quantities and has been troubled by disposal until now. In the case where the size is reduced due to the use of the residual material, the void form 2 may be manufactured by connecting a plurality of pieces.
[0012]
Next, a method of constructing a void slab by a conventional method using the remaining formwork plywood will be described.
[0013]
<A> Production of Void Formwork Formwork plywood remaining material 22 is processed to produce void formwork 2 having a predetermined size. The void form 2 is formed by assembling a side plate, a bottom plate, and an upper plate into a rectangular parallelepiped and has a size corresponding to the void. If necessary, a pier 23 such as a pier or plywood veneer is applied to the inside to reinforce.
[0014]
<B> Arrangement of Void Formwork by Conventional Method A lower reinforcing bar 3, a void formwork 2, an upper reinforcing bar 31, and the like are arranged inside a slab formwork 1 as shown in FIG. The void form 2 is arranged by adjusting the gap with the slab form 1 by the gap member 21. Unlike the styrofoam material, the void form 2 and the slab form 1 can use nails, so that they can be easily connected to the gap member 21 and can be fixed at predetermined positions. If necessary, as shown in FIG. 1, the truss bars 32 can be reinforced and arranged between the upper reinforcing bar 31 and the lower reinforcing bar 3.
[0015]
<C> Gap Member The gap member 21 arranges the void form 2 at a predetermined position of the void slab. For example, as shown in FIG. This is a member that is installed with a gap between them. Although various materials can be used for the gap member 21, a material that can be nailed is preferable. The leg portion 211 of the gap member 21 is a portion attached to the slab formwork 1. It is preferable that at least a portion 212 of the leg portion 211 that is in contact with the slab form 1 is made of plastic.
[0016]
<4> Casting concrete Concrete is cast inside the slab formwork 1. At this time, the concrete can be smoothly wrapped under the void form 2 by using a vibrator. The provision of the air vent hole 24 in the lower part of the void form 2 allows the concrete to be more easily wrapped around the lower part of the void form 2. On the other hand, in the case of the void form made of the styrofoam material, the strength is weak, and the breakage during use of the vibrator can be considered. Therefore, it is difficult to make the concrete go under the void formwork. Therefore, it is necessary to reduce the size of the void form and to use a large number of them, which requires a great deal of labor for installation.
[0017]
In the case where the gap member 21 comes off in concrete casting and the void form 2 rises, the lifting prevention device 6 is attached to the void form 2 to prevent the void form 2 and fix it at a predetermined position. The lifting prevention tool 6 has one end fixed to the slab formwork 1, the other end directed upward, and the void formwork 2 pressed down with a fastener or the like to be fixed.
[0018]
The cast concrete is cured and sufficiently dried to complete a void slab as shown in FIG. 1 (B). In this case, since it is unnecessary to remove the mold 2 for voids, the step of removing the mold can be omitted. In addition, by placing the remaining chip material or the like inside the void form 2, excellent sound insulation properties and an improvement in performance such as a heat insulating effect can be expected.
[0019]
<E> Lifting prevention device The lifting prevention device 6 prevents the void form 2 from rising. The lifting prevention tool 6 has a fixing tool 61 attached to the slide form 1 as shown in, for example, FIGS. 2B and 2C. The fixing tool 61 may be any as long as it can be attached to the slide mold 1, and includes, for example, a P-con, a wooden con, and the like, and preferably, plastic. The fixing tool 61 is fixed to the slide mold 1 by, for example, a fastener 62. The lifting prevention device 6 has a stopper 63 for fixing the void formwork 2. As the stopper 63, for example, a P-con, a wooden con, or the like with a plate interposed is used. The fixing tool 61 and the stopper 63 are connected by a connecting member 64, and the void form 2 is fixed to the slide form 1. The connecting member 64 penetrates through, for example, the slab form 1 and is fixed to the fixture 61.
[0020]
Next, a method of constructing a void slab in which the lower concrete is cast in advance will be described.
[0021]
<A> Casting of lower concrete The lower reinforcing bar 3 and the truss bars 32 are assembled in the slab formwork 1 and the lower concrete 4 is cast. As shown in FIG. 3A, the void formwork 2 made of the formwork plywood residue 22 is directly placed on the lower concrete 4 and fixed. The fixing method of the void form 2 may be various fixing methods. For example, before the lower concrete 4 is solidified, the void form 2 is disposed on the lower concrete 4 and solidified with concrete to fix the void form. Or, it is effective to fix using an adhesive. Then, assemble the upper rebar. The void formwork 2 is installed in a state of being bonded to the lower concrete 4 and has higher strength than the void formwork made of styrofoam, so that the worker can use the void formwork 2 as a scaffold. Even if a reinforcing bar or the like collides with the inside, the void formwork 2 is not damaged, and workability can be improved.
[0022]
<B> Casting of upper concrete The upper concrete 41 is cast. Since the void form 2 is fixed to the lower concrete 4, there is no lifting or lateral displacement when the upper concrete 41 is cast, and a void is formed at the position where the void form 2 is installed. When the upper concrete 41 is cured and sufficiently dried, the void slab is completed.
[0023]
Next, a method of constructing a void slab using a precast concrete plate effectively will be described.
[0024]
<A> Installation of Precast Concrete Plate As shown in FIG. 3 (B), for example, a thin precast concrete plate (semi-PCa floor plate) 5 is laid as a lower concrete 4 in a slab formwork 1 at a lower portion. In this case, a precast concrete plate 5 provided with reinforcing bars and truss bars in a factory is manufactured in advance. The required number of precast concrete plates 5 are carried into the site. The void form 2 made of the remaining formwork plywood is directly placed on the precast concrete plate 5 and fixed. The method of fixing the void form 2 on the precast concrete plate may be any of various fixing methods. For example, a method using an adhesive is effective. The bonding of the void form 2 to the precast concrete plate 5 may be performed at a factory.
[0025]
Next, the upper reinforcing bar 31 is arranged, the upper concrete 41 is cast on the slab, and the void formwork 2 is buried to construct a void slab. At this time, if the void formwork 2 is bound to the truss streaks 32 by the number line, it can be fixed securely. According to this method, since the precast concrete plate is manufactured at the factory, the quality is stable and the concrete is required to be hit once, and the construction period on site can be shortened.
[0026]
As described above, in the method for constructing the void slab, steps similar to those in the conventional construction method are omitted.
[0027]
[Effects of the present invention]
According to the present invention, as described above, the following effects can be obtained.
<A> The present invention can effectively utilize the remaining formwork plywood that is in trouble for disposal, and can reuse resources. In particular, the recycling of industrial waste can contribute to environmental problems and reduce the cost of treating industrial waste.
<B> Further, in the present invention, since the mold for voids is made of the remaining material of the formwork plywood, manufacture and handling are facilitated, and the cost can be significantly reduced.
<C> Further, in the present invention, since the void formwork is formed of the formwork plywood remaining material, the void formwork can be used as a work scaffold when arranging reinforcing bars, and since it is made of plywood Even if a reinforcing bar or the like hits, the void material is not damaged, and the workability is improved.
<D> In addition, according to the present invention, if the void form is installed when the lower concrete is not cured, the void form is composed of the formwork plywood remaining material, so that the operator can easily press only from above. Can be fixed to the lower concrete.
<E> Further, the present invention has a low possibility of generating harmful substances at the time of fire, and can prevent occurrence of danger.
<F> In addition, according to the present invention, a void slab having excellent sound insulation properties and a large heat insulating effect can be obtained by placing a chip material or the like remaining inside the void formwork.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a void slab in which a void form is buried. FIG. 2 is an explanatory view of a gap member and a lifting prevention device. FIG. 3 is an explanatory view of a void form. FIG. Illustration of void slab used for frame [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Slab form 2 ... Void form 21 ・ ・ Gap member 211 ・ Leg 212 ・ Part in contact with the slab form 22 ・ ・ Form form plywood residue 23 ・ ・ Pile 24 ・ ・ Air vent hole 3 Lower reinforcing bar 31 Upper reinforcing bar 32 Truss bar 4 Lower concrete 41 Upper concrete 5 Precast concrete plate 6 Floating prevention device 61 Fixing device 62 Fastening Tool 63, Stopper 64, Connection material

Claims (6)

A method for constructing a void slab that effectively utilizes a formwork plywood residual material by embedding a void formwork to be a void in concrete and constructing a slab.
Place the slab formwork,
Arrange the lower reinforcement in the slab formwork,
A void formwork made into a shape corresponding to the void using the formwork plywood remaining material is installed in the slab formwork via a gap member,
Arrange the upper rebar in the slab formwork,
A method for constructing a void slab that effectively utilizes remaining formwork plywood, characterized by casting concrete into a slab formwork and embedding a void formwork in the concrete. A method for constructing a void slab that effectively utilizes the remaining formwork plywood according to claim 1,
A method for constructing a void slab that effectively utilizes remaining formwork plywood, characterized in that the gap member is fixed to the slab formwork, the void formwork, and nails. A method for constructing a void slab that effectively utilizes the remaining formwork plywood according to claim 1,
When casting concrete, a vibrator is used to provide an air vent hole at the bottom of the void form, and the concrete is easily spilled into the bottom of the void form. How to build a void slab that is effectively used. A method for constructing a void slab that effectively utilizes a formwork plywood residual material by embedding a void formwork to be a void in concrete and constructing a slab.
Place the slab formwork,
Arrange the lower reinforcement in the slab formwork,
Pour the lower concrete into the slab formwork,
On the lower concrete, directly install the void formwork made into a shape corresponding to the void using the formwork plywood residual material,
Arrange the upper rebar,
A method for constructing a void slab that effectively utilizes remaining formwork plywood, characterized by casting concrete and embedding a void formwork in the concrete. A method for constructing a void slab that effectively utilizes the remaining formwork plywood according to claim 4,
A method of constructing a void slab that effectively utilizes remaining formwork plywood, wherein the void form is fixed to the lower concrete with an adhesive. A method for constructing a void slab that effectively utilizes a formwork plywood residual material by embedding a void formwork to be a void in concrete and constructing a slab.
Spread precast concrete boards,
On the precast concrete board, install the void formwork made into a shape corresponding to the void using the formwork plywood residual material,
Arrange the upper rebar,
A method for constructing a void slab that effectively utilizes remaining formwork plywood, characterized by casting concrete and embedding a void formwork in the concrete.

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