JP2003239435A - Reinforced-concrete void slab structure and its building method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To speedily build a reinforced-concrete void slab at a low cost. <P>SOLUTION: A unit U in which a bar arrangement 10 and void slabs 20 are unified is manufactured at a place excepting a site such as a factory, and the unit U is carried into the site. Since the unit U can be manufactured at the same time as the building of the forms and can be installed on the forms immediately after the completion of the building of the forms, a building speed can be increased. Large-scale equipment is not required for manufacturing the unit, and the unit can be produced at the low cost in not only the factory but also an unoccupied land or the like near to the site. When the size of the unit can be supported by the frame of a building at both ends of the unit in this case, the unit is supported by a support at both ends. When a truss bar is used as the bar arrangement in which both ends are supported to the frame of the building, the unit is supported more sufficiently. When an iron plate as an extra frame is further installed integrally on the underside of the unit, the building of conventional forms is made unnecessary. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab structure in which a void formwork is arranged together with a reinforcing bar, and concrete is placed so that the reinforcing bar and the void formwork are buried, and a construction method thereof.

[0002]

2. Description of the Related Art Conventionally, there are three methods for constructing a reinforced concrete void slab of this type: a cast-in-place method, a precast method, and a half precast method. The in-situ casting method is that after building the formwork, the reinforcing bars are laid on the formwork, the void formwork is installed, and the concrete is placed so that the reinforcing bar and the void formwork are filled. Build a slab.

In the precast method, a reinforced concrete void slab having a size that can be installed between columns of a building is manufactured in advance by a work similar to the in-situ casting method in a factory, and the reinforced concrete void slab is carried to a construction site and assembled into a slab. To build. In the half precast method, only the lower part of the reinforced concrete void slab is manufactured in the factory, the half slab is brought into the construction site, and the remaining concrete is cast to construct the slab. This method may omit formwork building and void formwork installation. Japanese Patent Application Laid-Open Nos. 5-599776 and 6-
See Japanese Patent No. 73818, Japanese Patent Laid-Open No. 2001-262758, and the like.

[0004]

[Problems to be Solved by the Invention] Each of the above methods,
Although there is no big difference in slab performance, in terms of construction speed, precast method, half precast method, in-situ casting method are superior in order, and in terms of cost, precast method, half precast method, in-situ casting method become cheaper in order. .

Under these construction methods, there is a demand for speeding up of construction in the midst of the demand for cost reduction today.

Under the above circumstances, it is an object of the present invention to make the construction cost lower and the construction speed faster than the conventional construction methods.

[0007]

In order to achieve the above-mentioned object, the present invention provides a bar arrangement and a void formwork which are integrated (simultaneously or continuously) in consideration of the fact that A unit with an integrated void form was made at a place other than the factory, such as a factory, and the unit was brought to the site.

[0008] In this way, for example, the bar arrangement is carried out after the building of the form has been completed, but the unit can be manufactured regardless of the completion of the building. Therefore, the unit can be manufactured at the same time as the formwork is built, and the unit can be installed on the formwork immediately after the formwork has been built, and the construction speed can be improved. In addition, compared to concrete pouring, large-scale equipment is not required for the production of the above unit, not only in the factory,
It can also be made in an open space near the site. Therefore, the cost is lower than that of the precast method and the half precast method. Furthermore, since the finished slab structure is composed of unitized reinforcements and the like, it is easy to obtain strength in terms of design.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION As an embodiment of the present invention,
In the reinforced concrete void slab structure and its construction method, in which the void formwork is arranged together with the reinforcing bar and the concrete is placed so that the reinforcing bar and the void formwork are buried, in the place other than the site such as a factory, the reinforcing bar is used. It is possible to adopt a configuration in which a unit in which the void form and the void form are integrated is manufactured, the unit is brought to the site and placed, and then the concrete is poured.

In this structure, if the size of the unit is such that both ends of the unit can be supported by the peripheral members of the building, etc., the unit is supported by the supports at both ends, so the number of supporting works between the both ends is reduced. Can be achieved. At this time, if the unit is supported on the peripheral members of the building by reinforcing bars at both ends and the reinforcing bar is a truss reinforcing bar, the unit will be supported more reliably and the number of supporting work can be further reduced. it can.

In each of the above constructions, if an iron plate to be a discarding mold is integrally provided on the lower surface of the unit, it is not necessary to build a conventional mold.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment is shown in FIGS. 1 to 8. In this embodiment, as shown in FIG. 1, a floor board (slab S) between pillars H is constructed in an apartment building such as an apartment. It is a thing. This building has an H-framed structure, as shown in Figure 2.
Constructed with a shape steel h, etc., the concrete frame P also serves as the formwork for the pillars H, the formwork Q is placed on the bottom surface of the slab S part (built-in) and supported by the support r, and the formwork Q After arranging and fixing the unit U of the reinforcing bar 10 and the void formwork 20 on the upper side, concrete C is poured and the pillar H and the slab S are constructed. The unit U is supported by mounting and fixing the reinforcing bar around the unit U to a skeleton such as a column H, a beam B, and an H-shaped steel h forming a part of the wall W, which are peripheral members of the slab building.

As shown in FIGS. 3 to 5, the unit U is a bar arrangement 10 comprising truss bars 11 and 12, a slab upper end bar 13 and a slab bottom bar 14, which are arranged in two orthogonal directions.
And the void form 20. The size of the slab S between the columns H in FIG. 1 is the width (a × b).
The void form 20 may be made of a synthetic resin as well as a hollow pipe such as a steel pipe or a spiral pipe.

This unit U is manufactured at a place other than the site such as a factory. First, as shown in FIG.
4 is arranged, and the truss bars 11 in the longitudinal direction are installed thereon, and then the truss bars 12 in the lateral direction are arranged (see FIG. 4).
(B)). At this time, the vertical truss reinforcement 11 is made taller than the horizontal truss reinforcement 12, so that the horizontal truss reinforcement 12 can pass through the vertical truss reinforcement 11 (see FIG. 6). . Therefore, both truss muscles 11, 1
2 are arranged in two orthogonal directions at substantially the same level. The trusses 11 and 12 can pass through in the opposite direction, that is, the trusses 12 extending in the lateral direction can pass through the trusses 11 extending in the vertical direction.

Next, as shown in FIG. 4C, the void form 20 is placed in the space surrounded by the truss bars 11 and 12. This arrangement mode is arbitrary as long as it matches the strength calculation of the slab S. At this time, the void form 20 is
Although it may be individually fixed to 0, as shown in FIGS. 7 and 8, it is preferable to use an integrated unit (unit) provided in the iron basket 21. After this, as shown in FIG. 4D, the upper end streak 13 is arranged. Upper and lower end muscles 13 and 14, truss muscle 1
The 1st and 12th and the void formwork 20 are fixed immovably to each other by welding, wire number fastening or the like. In addition, if necessary, the steel plate pieces 30 are welded in a triangular shape to both ends of each truss reinforcement 11, 12,
Reinforce both ends of the unit U.

In the embodiment shown in FIGS. 9 and 10, the unit U is used.
An iron plate 40, which serves as a discarding form, is integrally provided on the lower surface of the plate by welding or the like. In this embodiment, the conventional form Q
Is unnecessary, and the support work r can be suppressed to the necessary minimum.

In these examples, the support span (column H)
A bidirectional void slab structure in which the spaces are supported by vertical and horizontal trusses 11 and 12 can transmit stress in the two directions, and the supporting work r can be reduced as much as possible. The truss muscles 11,
Only one of 12 may be used, and both can use the rectus muscle.

In each of the above-mentioned embodiments, the reinforcing bar 10 and the void form 20 of one slab S between the four columns H are one unit U. However, a gap is appropriately formed in one direction (a or b in FIG. 1). Divided unit U, or unit U divided at appropriate intervals in both directions
Can be

[0019]

According to the present invention, since the bar arrangement and the void formwork are integrated into a unit and brought into the field to construct the slab, both the construction speed and the construction cost can be satisfied. Become.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a slab construction example according to an embodiment.

FIG. 2 is a sectional view of the same main part.

FIG. 3 is a schematic perspective view of a unit according to an embodiment.

4A and 4B are manufacturing explanatory views of the unit, in which FIG. 4A is a plan view, FIG. 4B is a right side view, and FIG.

FIG. 4B is an explanatory view of manufacturing the unit, in which (a) is a plan view, (b) is a right side view, and (c) is a front view.

FIG. 4c is a production explanatory view of the same unit, (a) is a plan view, (b) is a right side view, and (c) is a front view.

FIG. 4d is a production explanatory view of the same unit, in which (a) is a plan view, (b) is a right side view, and (c) is a front view.

FIG. 5 is a partial perspective view of the unit.

FIG. 6 is a perspective view of a main part of a transverse truss muscle of the unit.

FIG. 7 is a perspective view of a void form unit.

FIG. 8A is a plan view of the same void form unit,
(B) is the same right side view, (c) is the same front view

FIG. 9 shows a unit of another embodiment, (a) is a plan view, (b) is a right side view, and (c) is a front view.

FIG. 10 is a sectional view of the main part of the embodiment.

[Explanation of symbols]

Beam of B building C concrete H Building Pillar W building wall h H type steel P concrete panel S slab Q formwork r Support work 10 Bar arrangement 11, 12 truss muscle 13 Slab upper end streak 14 Slab bottom muscle 20 void formwork 21 iron basket 30 iron plate pieces 40 Abandoned formwork (iron plate)

Claims (8)

[Claims] 1. In a reinforced concrete void slab structure in which the reinforcing bar 10 and the void form 20 are embedded in concrete C, a unit U in which the reinforcing bar 10 and the void form 20 are integrated.
And a reinforced concrete void slab structure, wherein the reinforced concrete void slab structure is embedded as described above. 2. The reinforced concrete void slab structure according to claim 1, wherein the unit U is supported at both ends thereof by building peripheral members H, B and W. 3. The unit U is supported by peripheral members H, B, W of the building by means of its bar arrangement 10, and its bar arrangement 1
The reinforced concrete void slab structure according to claim 2, wherein 0 represents truss bars 11 and 12. 4. The reinforced concrete void slab structure according to any one of claims 1 to 3, wherein an iron plate 40 serving as a discarding form is integrally provided on the lower surface of the unit U. 5. A method for constructing a reinforced concrete void slab S in which a void form 20 is arranged together with the reinforcing bar 10 and concrete C is placed so that the reinforcing bar 10 and the void form 20 are buried. At a place other than the site, a unit U in which the reinforcing bar 10 and the void form 20 are integrated is manufactured, and the unit U is brought to the site and placed, and then the concrete C
A method for constructing a reinforced concrete void slab, which is characterized in that 6. The size of the unit U can be supported by the peripheral members H, B, W of the building at both ends thereof,
The method for constructing a reinforced concrete void slab according to claim 5, wherein the unit U is arranged so as to be supported by a peripheral member of a building with both ends thereof. 7. The reinforced concrete void slab according to claim 6, wherein the unit U is supported on the peripheral members of the building by the reinforcing bar 10 and the reinforcing bar 10 is truss bars 11 and 12. How to build. 8. The method for constructing a reinforced concrete void slab according to any one of claims 5 to 7, wherein an iron plate 40 serving as a discarding form is integrally provided on the lower surface of the unit U.