JP3014918B2 - Construction method of slab formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a slab form for constructing a slab (horizontal flat plate portion) such as a reinforced concrete structure.

[0002]

2. Description of the Related Art Conventionally, when a slab form is formed in a reinforced concrete structure such as an apartment house, as a support for supporting the form, a pipe support is first assembled on a work floor under the slab, and is then referred to as an overhaul. After a beam and a joist such as a steel pipe are arranged at right angles to the beam, a method of laying a formwork thereon, or a method of laying a formwork directly or through a joist on a lightweight support beam is performed.

[0003] The shoring is an indispensable equipment for holding the formwork in a predetermined position. Conventionally, various types of steel pipes, tying fittings and the like suitable for the weight and purpose of the concrete to be supported have been used. Is used. After forming the formwork on the supporter assembled in this manner and further arranging the reinforcing steel, concrete is poured. After the cast concrete is hardened, the formwork and the support are generally removed. However, when a heat insulating plate which is also used for the form described in JP-A-3-208944 is used, the support is Only are removed.

[0004] It is relatively easy to remove these supports and formwork when there is a large space, but in the case of a first floor or pit, it is usually necessary to cast concrete such as underfloor ventilation holes or manholes. In many cases, the remaining openings are not large enough to carry out these equipment, and the equipment used as a shoring together with the formwork is carried out from the openings provided separately in advance, and then the openings are provided. The method of blocking is taken.

[0005]

In a conventional method of laying a formwork using a shoring method, for example, a floor of a building having a low floor is used.
If the space height for installing shoring for forming the slab form is low, such as when draining water treatment facilities, constructing or constructing a spring pit, or constructing by reverse striking, pipe supports etc. There were problems such as the inability to stand, or even if some support was installed, the work had to be performed in a narrow space when the slab formwork was dismantled, and it was extremely difficult to carry out the equipment. In addition, most of the work related to the installation and removal of the slab formwork is done manually, and there is little room for mechanization.In particular, since the conventionally used pipe supports and steel pipes are heavy, loading, installation, dismantling, The unloading work is hard work,
There were problems such as extremely difficult work.

An object of the present invention is to propose an epoch-making slab formwork construction method capable of reducing work and alleviating restrictions on installation conditions.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems. As a support, a foamed plastic plate panel and a foamed plastic plate spacer were used. By forming and connecting the spacer and the spacer in a specific arrangement, it is found that there is no buckling (buckling) due to the vertical load due to the weight of the concrete to be supported, and it can function sufficiently as a support. A radically different groundbreaking slab formwork construction method has been completed.

[0008] That is, a method of constructing a slab form according to the present invention for solving the above-mentioned problems is as follows. 1. In inclusive construction formwork for building reinforced concrete slab, parallel crosses a plurality of foamed plastic plate
A method of constructing a slab formwork, characterized in that a slab formwork is provided in such a manner that the formwork is installed vertically on the work floor, and the formwork is installed on the girder surface of the formwork. 2. In inclusive construction formwork for building reinforced concrete slab, a lattice shape a plurality of foamed plastic plate
A method for constructing a slab formwork, wherein the formwork is installed in a state of being vertically connected to a work floor, and the formwork is installed on a lattice plane of the formwork. 3. In the construction of a formwork for constructing a reinforced concrete slab, a plurality of panels (1) of foamed plastic plates are arranged with the width direction of the panel (1) perpendicular to the work floor (4), and the gap is set. In addition, a spacer (2) made of a foamed plastic plate is arranged between the panels (1), and the panel (1) and the spacer (2) are connected and fixed, and the form (3) is removed. A method of constructing a slab formwork, comprising supporting a shoring and installing a formwork on the shoring.

Hereinafter, the present invention will be described in detail. The example to which the method of the present invention is applied is, of course, applied to the case of a slab constructed on a relatively large space in which a living room of a reinforced concrete structure is installed. It is particularly suitable for a slab constructed on a relatively narrow space such as a floor, drainage of a water treatment facility, or a spring pit. In addition, recently, for underground construction of a new building, cast-in-place pile construction was used to pre-install a timber column and work floor, and the concrete of columns, beams, floors, and wall members was reversed while excavating soil from the upper floor. Although the method of hammering is adopted, the method of the present invention is also suitable for these reverse hammering methods.

According to the present invention, as described above, instead of the conventional combination of support, pulling, and joist, a plurality of panels of a foamed plastic plate which is erected perpendicularly to the work surface are used. This is a novel construction method that supports the formwork (3) with a shape fixed by a spacer. The plurality of panels used in the present invention are those using the lightest foamed plastic plate as the equipment,
If you need more reinforcement of this foam plastic plate,
Another material can be laminated on the foamed plastic plate or reinforced with another member. Preferred panels are polystyrene-based foamed plastic boards, and particularly preferred are extruded foamed polystyrene boards.
The polystyrene foam plastic plate has appropriate physical properties in terms of compressive strength, flexural strength, flexural elasticity, etc., so there is no need to reinforce with other members, and it is used simply by controlling the thickness. I found that I could do that.

The thickness of a plurality of panels used in the present invention is as follows:
If it is too thin or too thick, a sufficient effect cannot be obtained. Preferred is a panel having a thickness of 50 to 200 mm. The construction manager can select an optimum thickness according to the weight of the concrete to be supported and the condition of the construction.

At the time of construction, as shown in FIG. 1, a plurality of panels are arranged in parallel with each other at an interval in a state where the width direction of the panels is perpendicular to the work floor. In the embodiment shown in FIGS. 1 and 2, the interval (pitch) between the panels is six times (1820 mm) and is divided into six.
It is not necessarily limited to this pitch. The interval (pitch) of the panels can be freely selected according to the weight of the concrete to be supported and the construction conditions.

The panel used in the present invention has the above-mentioned thickness and its surface (A in FIG. 1) is flat, so that the joint portion of the formwork meets on one panel. . Therefore, in a conventional joist having a circular cross section, 2
It was necessary to apply a book joist under the joint part or to temporarily fix the joint part using a crosspiece, but such a troublesome operation is not required.

Further, in the present invention, it is necessary to arrange a spacer between the panels of the foamed plastic plate. This spacer is a kind of anti-slip, and can prevent the panel from falling down and buckling. As shown in FIGS. 1 and 2, the spacer is disposed between the panels so that the surface of the panel and the end surface of the spacer come into close contact with each other. The larger the contact area, the better the function as a spacer. The thickness of the spacer is generally 50 to 200 as in the case of the panel.
mm, but is not necessarily specified. Although the height of the spacer is equal to the width of the panel in FIG. 1, the height is not necessarily equal.

The plurality of panels and the spacer are fixed to each other by a simple adhesive means such as a double-sided tape, an adhesive tape, or a fastener. Furthermore, if a concave portion (not shown) is formed on the surface B of the panel (1) in FIG. 1, the panel (1) and the spacer (2) will fit together. do not need. What can be firmly fixed to each other by such a simple bonding means is that
This is a characteristic feature of the foamed plastic plate which is lightweight and has a large flat surface.

Next, the slab formwork is placed on the supporter thus assembled. As in the case of the conventional shoring, any form can be used regardless of the type of the form. However, in order to further exert the effect of the present invention, it is described in JP-A-3-208944. It is preferable to employ a heat insulating plate that also serves as a mold. This heat-insulating plate also serving as a mold is a heat-insulating plate also serving as a mold formed by attaching and laminating a plastic film to one surface of a heat-insulating plate made of a foamed polystyrene plate. Examples of the plastic film to be attached and laminated include a polyester film and a polyethylene film.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. This embodiment is an example in which the present invention is applied to a reinforced concrete under a first floor under a relatively low space height.

An extruded expanded polystyrene plate having a thickness of 100 mm was cut into a width corresponding to the height of the support and a length suitable for the construction site to produce a plurality of panels (1). The plurality of panels (1) are erected on the work floor (4) so that the width direction of the panel (1) is perpendicular to the work floor (4), as shown in FIG. Arranged at intervals.
On the other hand, a foamed plastic plate having the same width as that of the panel (1) is cut in accordance with the interval between the panels,
The spacers (2) were arranged at right angles to the surface B of the panel.

FIG. 2 shows the mutual arrangement of the panel (1) and the spacer (2) as viewed from above.
It can be seen that the spacer and the spacer (2) are arranged in a grid pattern.

The thickness of the panel (1), the pitch (interval) between the panels (1), and the pitch (interval) between the spacers (2) depend on the weight of the concrete cast on the formwork (3). It was set to be sufficient. The panel (1) and the spacer (2) were fixed to each other using a double-sided tape, an adhesive tape, a fastener, or the like to completely prevent the panel (1) from falling down and buckling.

The formwork (3) was stretched horizontally on the support of the foamed plastic plate thus constructed. FIG.
As shown in the figure, the longitudinal direction of the mold (3) is arranged so as to be perpendicular to the panel (1), and the joint portion of the mold (3) is placed on the panel (1) and the spacer (2). The size and pitch of the spacer (2) were adjusted so as to meet each other. As a mold (3), a heat insulating plate (1820 mm in length, 910 mm in width,
(Thickness: 30 mm).

Next, reinforcing bars were arranged on the formwork (3), and concrete was cast. After the concrete hardened, the panel (1) and the spacer (2) were removed. Since the panel (1) and the spacer (2) are mainly fixed by the adhesive tape, the disassembly work is much easier than the pipe support or the like fixed with metal fittings, and it is easy to carry out.

In the embodiment, a mold (3) is disclosed in
The use of the form and heat insulating board disclosed in Japanese Patent Publication No. 208944 makes it possible to perform the work of the form and the laying of the heat insulating material at the same time, and to omit the work of removing and carrying out the form when the support is dismantled. This example also shows that the height of the support can be freely adjusted by the dimensions of the panel (1) and the spacer (2) even when the conventional pipe support is difficult to insert due to the low height of the support. I understand.

[0024]

The effects of the present invention are as follows. 1. The installation work of the shoring is reduced in weight and the assembling becomes easy. That is, the foamed plastic plate is lighter than the conventional shoring constructed of steel pipes, tying fittings, etc., and can be cut easily and freely with a blade when assembling. It is extremely easy to fix and assemble. 2. Disassembly of the shoring becomes easy, and the carrying out of the equipment used becomes lighter. It is extremely easy to disassemble the foamed plastic plate fixed with an adhesive tape or the like. When not reused, it may be broken down and discarded as it is. The point that the carry-out is light is the same as at the time of installation. 3. Even if the height of the support works is low, the slab formwork can be built. Even when the height of the shoring is low and cannot be accommodated by the conventional pipe support, the height of the shoring can be freely adjusted by the dimensions of the panel (1) and the spacer (2). The ease of disassembly and unloading also eases restrictions on installation height.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a slab formwork according to a construction method of the present invention.

FIG. 2 is a plan view showing an example of a slab formwork according to the construction method of the present invention.

[Explanation of symbols]

 1. Panel 2. Spacer 3. Formwork 4. Work floor

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroaki Kamiyoshi 1-2-1 Shibaura, Minato-ku, Tokyo Dow Chemical Industries Co., Ltd. (56) References JP-A-5-79049 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) E04G 11/36-11/56 E04G 25/00-25/08

Claims (3)

(57) [Claims] In the construction of a formwork for constructing a reinforced concrete slab, a plurality of foamed plastic plates are interconnected and arranged in a cross-girder shape, and this is used as a support while standing vertically on a work floor. A method for constructing a slab formwork, wherein the formwork is installed on a cross-girder surface of the support. 2. A method for constructing a formwork for constructing a reinforced concrete slab, wherein a plurality of foamed plastic plates are interconnected and arranged in a grid pattern, and this is used as a support while standing vertically on a work floor. A method of constructing a slab formwork, wherein the formwork is installed on a lattice surface of the support. 3. The construction of a formwork for constructing a reinforced concrete slab, wherein a plurality of panels (1) of foamed plastic plates are erected perpendicularly to the working floor (4) in the width direction of the panels (1). In the state, the spacers (2) of the foamed plastic plate are arranged between the panels (1) at intervals, and the panel (1) and the spacers (2) are connected and fixed, and the mold is formed. A method for constructing a slab formwork, wherein the formwork is a supporter supporting the frame (3), and a formwork is installed on the supporter.