JP2015168948A - Void slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a void slab allowing reliably forming a hollow part and using the hollow part as an air circulating channel.SOLUTION: A void slab 1 includes: a plurality of beams 10 which are arranged in a predetermined direction; lower slabs 11 for connecting the lower ends of the plurality of beams 10 each other; and upper slabs 12 for connecting the upper ends of the plurality of beams 10 each other. A steel cylindrical spiral duct 21 is accommodated in a hollow part 20 surrounded by the plurality of beams 10, the lower slabs 11 and the upper slabs 12. The hollow part 20 is provided with: a pair of wall forms 31 which are made of extruded polystyrene foam and cover the side face of the beams 10; and rungs 32 which are made of extruded polystyrene foam and connect the pair of wall forms 31 at predetermined intervals. The rungs 32 are provided with a cutout part 34 at least in part, and an air conditioning duct 35 is formed through the cutout part 34.

Description

  The present invention relates to a void slab having a hollow portion inside a slab in a concrete building.

  Conventionally, as one of the slab structures of a concrete building, there is a void slab in which a pipe is placed in a slab and concrete is placed in this state to provide a hollow portion inside the slab (Patent Document 1). reference). In this void slab, it has been proposed to use a hollow portion of an embedded pipe as an air flow path through which air for ventilation flows.

JP 2008-133688 A

By the way, in the void slab as described above, there is a case where the hollow portion is desired to have an arbitrary shape. In this case, the void slab is constructed according to the following procedure.
First, the slab concrete on the lower side of the hollow portion is placed and constructed.
Next, a plate-shaped extruded polystyrene foam having a low weight and low rigidity is used as a mold frame, and a blank mold is embedded on the lower slab in the shape of a hollow portion. Specifically, for example, a pair of plate-like wall molds are arranged along the mutually opposing wall surfaces of the hollow portion, and horizontal bars are provided at predetermined intervals, and the pair of wall molds are connected by these horizontal bars. Connect to ensure the rigidity of the wall formwork. Further, a ceiling mold is placed on the wall mold.
Then, concrete of the slab on the upper side of the hollow portion is placed to complete the void slab.

  However, in the above formwork, the cross section of the hollow portion is blocked by the horizontal rail, and thus there is a possibility that a flow path for air for ventilation cannot be secured.

  An object of this invention is to provide the void slab which can form a hollow part reliably and can utilize this hollow part as an air flow path.

  The void slab according to claim 1 (for example, a void slab 1 described later) is a concrete void slab having an air flow path, and a plurality of beams (for example, a beam 10 described later) arranged in a predetermined direction. A lower slab that connects the lower ends of the plurality of beams (for example, a lower slab 11 described later) and an upper slab that connects the upper ends of the plurality of beams (for example, an upper slab 12 described later), A plurality of beams, a lower slab, and a hollow part surrounded by the upper slab (for example, a hollow part 20 described later), a pair of wall molds (for example, a wall mold described later) covering the side surfaces of the beams Frame 31) and a horizontal beam (for example, horizontal beam 32 to be described later) for connecting the pair of wall molds at predetermined intervals, and at least part of the horizontal beam is notched. (For example, the notch described later 34) is provided, the air-conditioning duct through the cutout (e.g., wherein the air conditioning duct 35 to be described later) is formed Void Slab.

  The void slab according to claim 2 is characterized in that a cylindrical steel pipe (for example, a spiral duct 21 described later) is installed in the air conditioning duct.

According to the present invention, when the hollow portion is formed, the side rails are covered with the pair of wall molds and the horizontal rails connecting the pair of wall mold frames at predetermined intervals are provided. Can function as a supporter and can secure the rigidity of the wall formwork.
In addition, the adjacent horizontal rails are cut and removed at the same position to form notches that are continuous in a straight line, and a cylindrical steel pipe is disposed in the air conditioning duct that passes through these notches. The pier was penetrated. Thus, by arranging a steel pipe in contact with a notch part, the function as a support work is exhibited and it can prevent that a wall formwork shifts from a building position. Therefore, a hollow part can be formed reliably and this hollow part can be utilized as an air flow path.

  The void slab according to claim 3 is characterized in that the wall formwork and the horizontal rail are formed of extruded polystyrene foam or a honeycomb core laminated material made of paper.

Wall molds and crosspieces were formed from extruded expanded polystyrene or paper honeycomb core laminates. These extruded foamed polystyrene or paper honeycomb core laminates are lightweight and have a certain degree of rigidity, and are easy to cut, and therefore have high workability.
These extruded foamed polystyrene or paper honeycomb core laminates are disposed on the lower slab constituting the floor surface of the hollow portion, but may be adhered to the lower slab.

  The air-conditioning duct is doubly covered with void slab concrete and extruded foamed polystyrene or paper honeycomb core laminate provided along the inner peripheral surface of the hollow portion. Therefore, it is possible to secure heat insulation for reducing heat transfer and heat transfer of the low-temperature air and high-temperature air flowing through the air-conditioning duct to the outside, and also ensure water resistance accompanying this heat transfer. . Moreover, the sound insulation with respect to the sound generated with the movement of the circulating air can be ensured.

  Moreover, it is preferable to apply a rust preventive coating to the mold in the hollow portion so that rust does not occur in the hollow portion.

  The void slab according to claim 4 is provided with a heat insulating material (for example, a heat insulating material 22 described later) between the lower slab and the air conditioning duct, and the lower slab has a hollow portion and An opening that communicates with the outside (for example, an opening 13 described later) is formed.

According to the present invention, since the heat insulating material is laid on the lower side of the air conditioning duct, it is possible to prevent dew condensation due to the influence of low-temperature air flowing through the air conditioning duct. That is, this heat insulating material reduces thermal conductivity and prevents water particles contained in the air flowing through the air conditioning duct from condensing from gas to liquid.
In addition, since the heat insulating material was laid on the lower slab, the water vapor in the room entered the inside of the hollow part in the void slab, and dew condensation occurred inside the hollow part in the void slab, which is lower in temperature than the room due to the influence of the outside temperature. Internal condensation can be prevented.

  In addition, since the opening that connects the hollow part and the outside was formed in the lower slab, an air outlet for air conditioning was attached to this opening, or the duct installed in the hollow part was pulled out through this opening. Opening is available.

  According to the present invention, the horizontal rail functions as a support work, and the rigidity of the wall mold can be secured. Moreover, the adjacent crosspieces were continuously cut and removed at the same position to form a notch, and a cylindrical steel pipe was placed in the writing portion to penetrate the horizontal crosspiece. By disposing the steel pipe in contact with the notch, the function as a support work can be exhibited and the wall mold can be prevented from being displaced from the built-in position. Therefore, a hollow part can be formed reliably and this hollow part can be utilized as an air flow path.

It is a horizontal sectional view of a void slab concerning one embodiment of the present invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is sectional drawing (the 1) for demonstrating the procedure which builds the void slab which concerns on the said embodiment. It is sectional drawing (the 2) for demonstrating the procedure which builds the void slab which concerns on the said embodiment. It is sectional drawing (the 3) for demonstrating the procedure which builds the void slab which concerns on the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a horizontal sectional view of a void slab 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 3 is a cross-sectional view taken along line BB in FIG.
The void slab 1 includes a plurality of beams 10 arranged in a predetermined direction, a lower slab 11 that connects the lower ends of the plurality of beams 10, an upper slab 12 that connects the upper ends of the plurality of beams 10, Is provided.

A space surrounded by the plurality of beams 10, the lower slab 11, and the upper slab 12 is a hollow portion 20. A buried mold 30 is built in the hollow portion 20.
Specifically, the mold frame 30 includes a pair of wall mold frames 31 that cover the side surfaces of the beam 10, a horizontal beam 32 that connects the pair of wall mold frames 31, and a top of the wall mold frame 31 and the horizontal beam 32. And a slab formwork 33 that covers the lower surface of the upper slab 12.

The wall mold 31 is made of extruded polystyrene foam and extends along a predetermined direction, that is, the length direction of the beam 10.
The crosspiece 32 is made of extruded polystyrene foam and extends in a direction intersecting a predetermined direction, that is, in the width direction of the beam 10. The horizontal bars 32 are provided at predetermined intervals in the length direction of the beam 10.

The slab formwork 33 is made of extruded polystyrene foam and is installed substantially horizontally. The slab mold 33 is supported by the wall mold 31 and the horizontal bar 32.
From the above, the horizontal rail 32 functions as a formwork supporting work for the wall formwork 31 and the slab formwork 33.

Specifically, the wall mold 31 and the crosspiece 32 are used by cutting a standard product of extruded polystyrene foam 1820 mm × 910 mm × 100 mm (thickness) into a predetermined size, for example.
Further, the horizontal rails 32 are provided at intervals of 200 to 300 mm to support the wall mold 31.

Further, the hollow portion 20 accommodates a spiral duct 21 that is an air conditioning duct extending along the beam 10.
The spiral duct 21 is a cylindrical steel pipe and is installed through the horizontal rail 32.
That is, about the adjacent horizontal rails 32, the same position is cut and removed, and the notch part 34 which continues on a straight line is provided. An air-conditioning duct 35 that is an air flow path is formed through the cutouts 34, and a spiral duct 21 that is a cylindrical steel pipe is installed in the air-conditioning duct 35.
Further, a heat insulating material 22 made of extruded expanded polystyrene is provided between the lower slab 11 and the spiral duct 21.

The lower slab 11 has an opening 13 that communicates the hollow portion 20 with the outside.
The heat insulating material 22 is not provided immediately above the opening 13, and the spiral duct 21 is not disposed.

The above void slab 1 is constructed in the following procedure.
First, as shown in FIG. 4, the slab reinforcement 14 of the lower slab 11 and the beam reinforcement 15 of the beam 10 are arranged on the slab form frame 40 of the lower slab 11, and the floor surface of the lower slab 11. Place concrete up to the level. Thereby, the lower slab 11 and the lower part of the beam 10 are constructed. At this time, although not shown, the form of the opening 13 is built on the slab form 40 and the opening 13 is unboxed.

Next, as shown in FIG. 5, the heat insulating material 22 and the spiral duct 21 are installed in the portion that becomes the hollow portion 20, and the mold 30 is built.
Next, as shown in FIG. 6, the slab reinforcement 16 of the upper slab 12 is laid and concrete is laid down to the level of the floor surface of the upper slab 12.

According to this embodiment, there are the following effects.
(1) When the hollow portion 20 is formed, the side surfaces of the beam 10 are covered with a pair of wall molds 31 and the horizontal rails 32 that connect the pair of wall molds 31 at predetermined intervals are provided. The crosspiece 32 functions as a support work, and the rigidity of the wall mold 31 can be secured.
Further, the adjacent crosspieces 32 are cut at the same position and removed to form a continuous cutout 34, and a cylindrical steel pipe is formed in the air conditioning duct 35 passing through the cutout 34. A certain spiral duct 21 was arranged to penetrate the horizontal rail 32. Thus, by arranging the spiral duct 21 in contact with the notch 34, the function as a support work can be exhibited and the wall mold 31 can be prevented from being displaced from the built-in position. Therefore, the hollow part 20 can be formed reliably and this hollow part can be utilized as an air flow path.

  (2) The wall mold 31 and the crosspiece 32 were formed of extruded polystyrene foam. This extruded polystyrene foam is lightweight and has a certain degree of rigidity, and is easy to cut, and therefore has high workability.

  The air-conditioning duct 35 is doubly covered with one concrete of a void slab and an extruded polystyrene polystyrene mold 30 provided along the inner peripheral surface of the hollow portion 20. Therefore, it is possible to secure heat insulation for reducing the heat transfer / heat transfer of the low-temperature air and high-temperature air flowing through the air-conditioning duct 35 to the outside, and also ensure water resistance accompanying this heat transfer. it can. Moreover, the sound insulation with respect to the sound generated with the movement of the circulating air can be ensured.

(3) Since the heat insulating material 22 is laid on the lower side of the air conditioning duct 35, condensation due to the influence of low-temperature air flowing through the air conditioning duct 35 can be prevented. In other words, the heat insulating material 22 reduces the thermal conductivity and prevents water particles contained in the air flowing through the air conditioning duct from condensing from gas to liquid.
Further, since the heat insulating material 22 is laid on the lower slab 11, the water vapor in the room penetrates into the hollow part 20 in the void slab 1, and the hollow part in the void slab 1 whose temperature is lower than the room due to the influence of the outside air temperature. It is possible to prevent condensation (internal condensation) inside 20.

  (4) Since the opening 13 for communicating the hollow portion 20 and the outside is formed in the lower slab 11, an air-conditioning outlet is attached to the opening 13, or a duct installed in the hollow portion through the opening 13 is provided. The opening 13 can be used by pulling it out.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
In the present embodiment, the wall mold 31, the horizontal rail 32, and the slab mold 33 are formed of extruded polystyrene foam, but are not limited thereto, and may be formed of a paper honeycomb core laminated material.

DESCRIPTION OF SYMBOLS 1 ... Void slab 10 ... Beam 11 ... Lower slab 12 ... Upper slab 13 ... Opening 14 ... Slab reinforcement of lower slab 15 ... Beam reinforcement 16 ... Slab reinforcement of upper slab 20 ... Hollow part 21 ... Spiral duct 22 ... Heat insulation material 30 ... Formwork 31 ... Wall formwork 32 ... Horizontal crosspiece 33, 40 ... Slab formwork 34 ... Notch 35 ... Air conditioning duct

Claims (4)

A concrete void slab having an air flow path,
A plurality of beams arranged side by side in a predetermined direction, a lower slab that connects lower ends of the plurality of beams, and an upper slab that connects upper ends of the plurality of beams,
In the hollow portion surrounded by the plurality of beams, the lower slab, and the upper slab, a pair of wall molds that cover the side surfaces of the beams and a horizontal rail that connects the pair of wall molds at predetermined intervals. And are provided,
A void slab in which the horizontal rail is provided with a cutout part at least in part, and an air conditioning duct is formed through the cutout part.   The void slab according to claim 1, wherein a cylindrical steel pipe is installed in the air conditioning duct.   3. The void slab according to claim 1, wherein the wall formwork and the horizontal rail are formed of extruded foamed polystyrene or a paper-made honeycomb core laminated material. Between the lower slab and the air conditioning duct, a heat insulating material is provided,
The void slab according to any one of claims 1 to 3, wherein the lower slab is formed with an opening communicating the hollow portion with the outside.

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