WO2014103392A1

WO2014103392A1 - Deck plate support device and slab construction method using same

Info

Publication number: WO2014103392A1
Application number: PCT/JP2013/059356
Authority: WO
Inventors: 中村　誠; 行史松村
Original assignee: 株式会社Ａｏｉ
Priority date: 2012-12-28
Filing date: 2013-03-28
Publication date: 2014-07-03
Also published as: JP6068510B2; JPWO2014103392A1

Abstract

[Problem] To provide a slab construction method enabling a concrete slab to be constructed at a low cost in a building having beams of H-shaped steel, and a deck plate to be recovered and reused; and to provide a deck plate support device used in the slab construction method. [Solution] The deck plate support device (1a) is provided with: a driving metal (2) having a substantially C-shaped side profile comprising a connecting part (2c) and two gripping parts (2a, 2b) connected to the connecting part (2c) and disposed so as to face each other, the driving metal (2) being formed so that the flange (5a) of the H-shaped steel (5) can be inserted between the gripping parts (2a, 2b); a block (3) attached to the driving metal (2) so that the end part (6a) of a deck plate (6) can be placed on the upper surface; and bolts (4a, 4b). Screw holes (4c, 4d), which threadedly engage with the bolts (4a, 4b), are formed in the gripping parts (2a, 2b) of the driving metal (2). A through-hole (4e) is formed in the block (3) so that the bolt (4b) can be inserted from a side surface (3b) toward a side surface (3a).

Description

Deck plate support and slab construction method using it

The present invention relates to a slab construction method for forming a concrete slab for forming a floor, a ceiling or the like in a building made of H-shaped steel as a structural material, and in particular, reusing a deck plate used as a formwork when placing concrete. The present invention relates to a deck plate support that can be used and a slab construction method using the same.

In a building using reinforced concrete or steel reinforced concrete as a structural material, a slab is formed by placing concrete on a formwork temporarily provided on a beam or the like.
At that time, a deck plate made of metal plate material may be used for the formwork. Conventionally, the deck plate is often fixed to the upper surface of the beam by welding or bolting and separated from the solidified concrete. I couldn't.
In the slab having such a structure, there is an advantage that the tensile strength which is a defect of the concrete is improved by the deck plate integrated with the concrete. However, on the other hand, since the deck plate cannot be reused, there has been a problem that the construction cost becomes high.

Therefore, in recent years, various proposals have been made on techniques for recovering and reusing deck plates from concrete slabs after construction (hereinafter referred to as concrete slabs). In connection with this, several inventions and devices have already been disclosed.
For example, Patent Document 1 discloses that a concrete slab is efficiently formed between a first beam and a second beam arranged at a predetermined distance in the horizontal direction, and a temporary floor plate corresponding to the deck plate described above. An invention relating to a method for constructing a structure that enables reuse is disclosed.
The invention disclosed in Patent Document 1 is a variable-length temporary floor plate in which two flat plates are slidably coupled in the front-rear direction in a state where the rear end portion of one flat plate and the front end portion of the other flat plate overlap each other, A fixed-length temporary floor board is used. The variable-length temporary floor board and the fixed-length temporary floor board each have a flat surface that serves as a molding surface.
And, by pouring these temporary floorboards between a pair of opposing upper edge portions of the two beam forming molds via a sleeper installed on a support construction, the concrete as a molding material is poured. It is characterized by constructing a floor surface.
According to such a method, after the concrete is solidified, the variable-length temporary floorboard and the fixed-length temporary floorboard are easily separated from the concrete slab and recovered by dismantling the support work, the sleepers and the beam forming formwork. be able to.

Patent Document 2 discloses an invention relating to an apparatus for supporting a temporary formwork used when constructing a concrete slab under the name “temporary formwork support apparatus”.
The invention disclosed in Patent Document 2 is provided in the vicinity of both ends of a temporary support portion that supports a temporary formwork temporarily disposed between the beams of the building from below, and the temporary support portion. The upper and lower inner surfaces of the flange of the beam are pressed against each other, and a fixing mechanism is provided to fix both ends of the temporary support portion to the beam.
According to such a structure, after the concrete cast on the temporary mold is solidified and the fixing mechanism is released, the temporary mold and the temporary mold support device can be detached. Therefore, the temporary formwork and the temporary formwork support device can be reused.

Japanese Patent No. 3781425 JP 2002-303041 A

However, in the invention disclosed in Patent Document 1 which is the above-described prior art, the beam itself can be applied to a case where it is molded with concrete, but it is applied to a so-called steel structure building using H-shaped steel as a beam. However, there was a problem that it was not applicable.

Further, in the invention disclosed in Patent Document 2, it is necessary to use a member having high rigidity or the like for the temporary support portion so that the temporary form frame can be supported only by the temporary form frame support device without using a support work. In this case, the structure of the temporary support part becomes complicated or heavy, and the manufacturing cost increases. Moreover, since a temporary formwork support apparatus becomes a size equivalent to a temporary formwork, conveyance, installation, and removal are not easy. And since those operations require time and labor, there is a problem that the operation cost increases.

The present invention has been made in response to such a conventional situation, and it is possible to construct a concrete slab at a low cost in a building having an H-shaped steel beam and to collect and reuse a deck plate. It is an object to provide a simple deck plate support and a slab construction method using the same.

In order to achieve the above object, a deck plate support device according to the first aspect of the present invention is a deck plate support for building a concrete slab in a building having H-shaped steel beams arranged so that the flanges are horizontal. A deck plate support for supporting the two, having a pair of sandwiched portions opposed to each other, having a U-shape in a side view, and a fixing means formed so that a flange can be inserted therein, And a support means that is detachably attached to the fixing means and has a deck plate mounting surface provided at an upper portion thereof.
In the deck plate support having such a structure, when concrete mixed in advance is poured into the upper surface of the deck plate, the support means does not come into contact with the concrete, and the concrete does not enter the lower surface side of the deck plate. There is no possibility that the supporting means and the deck plate are taken into the solidified concrete. In addition, the deck plate support has the effect that the deck plate is safely and reliably supported despite the fact that the constituent members are inexpensive, the number of points is small, and the structure is simple.

The invention according to claim 2 is the deck plate support tool according to claim 1, wherein the support means is mounted on the deck plate mounting surface in a state of being attached to the fixing means and the flange. It is characterized in that it is formed so that the heights of the top surfaces of the two layers coincide with each other.
In the deck plate support having such a structure, in addition to the effect of the invention of claim 1, there is no step between the upper surface of the flange of the H-shaped steel and the upper surface of the deck plate, so that waste of concrete is saved. Has the effect of being removed.

According to a third aspect of the present invention, in the deck plate support according to the first or second aspect, the fixing means includes a holding portion connected to one of the pair of sandwiching portions, and the holding portion and the connection thereto The support means is formed so as to be insertable inside the sandwiched portion.
In the deck plate support having such a structure, in addition to the operation of the invention according to

claim

1 or 2, when the fixing means is attached to the flange of the H-shaped steel, the holding portion laterally and horizontally supports the supporting means. It has the effect of holding it from below. In this case, since one supporting means can be attached to or detached from the plurality of fixing means at a time, the efficiency is high.

According to a fourth aspect of the present invention, there is provided the deck plate support according to any one of the first to third aspects, comprising a bolt for fixing the support means to the fixing means, and a screw screwed into the bolt. A hole is formed in the fixing means, and a through hole for inserting a bolt is formed in the support means so as to communicate with the screw hole.
In the deck plate support having such a structure, in addition to the action of the invention according to any one of claims 1 to 3, the bolt is inserted into the through hole and further tightened into the screw hole. The support means is fixed to the fixing means.

According to a fifth aspect of the present invention, in the deck plate support according to the fourth aspect, the screw hole is formed on a side of the pair of sandwiching portions located below the flange.
In the deck plate support having such a structure, in addition to the operation of the invention according to claim 4, since the axial direction of the bolt is a vertical direction, the bending load based on the weight of the support means is applied to the bolt. It has the effect that it does not occur easily. Moreover, it has the effect | action that the direction which supports a support means, and the direction which fastens a volt | bolt correspond.

The invention according to claim 6 is the anti-rotation member according to claim 5, wherein a long hole is formed along the longitudinal direction for inserting a bolt into the flat surface portion in a rectangular shape in plan view. It is characterized by comprising.
In the deck plate support having such a structure, in addition to the action of the invention according to claim 5, the anti-rotation member rotates the support means against the rotational moment generated by the load of the deck plate or the concrete slab. It has the effect | action of preventing.

The invention according to claim 7 is the deck plate support tool according to any one of claims 1 to 6, wherein the holding portion on the side located below the flange of the pair of holding portions can be arranged. In addition, a concave portion is formed on the deck plate mounting surface of the support means so that the depth is equal to the thickness of the sandwiching portion.
In the deck plate support having such a structure, even when a rotational moment is applied to the support means due to the load of the deck plate or the concrete slab, the deck plate mounting surface of the support means comes into contact with the lower surface of the flange. This has the effect that the stress is difficult to concentrate at the location where the holding portion of the slidable portion contacts the support means.

The invention according to claim 8 is a building having a beam of H-shaped steel arranged so that the flange is horizontal, using the deck plate support tool according to any one of claims 1 to 7. A slab construction method for forming a concrete slab, the step of attaching a fixing means to a flange, the step of attaching a supporting means detachably to the fixing means, and the step of installing a deck plate on the upper surface of the supporting means, And a step of pouring concrete mixed in advance on the upper surface of the deck plate, a step of removing the supporting means from the fixing means after the concrete is solidified, and a step of removing the deck plate from the solidified concrete. It is characterized by.
In the slab construction method having such a configuration, when a concrete slab is constructed on a building having an H-shaped steel beam arranged so that the flange is horizontal, any one of claims 1 to 7 The action of the invention described in item 1 is exhibited.

As described above, according to the deck plate support device of the first aspect of the present invention, the deck plate can be easily separated from the solidified concrete. It can be recovered and reused in the state. Further, in the deck plate support of the present invention, the manufacturing cost can be reduced.

According to the deck plate support tool of the second aspect of the present invention, in addition to the effects of the first aspect of the invention, the material cost is kept low, and the cost for the entire construction of the slab is reduced. be able to.

According to the deck plate support tool described in claim 3 of the present invention, in addition to the effects of the invention described in claim 1 or claim 2, the support means can be safely attached to the fixing means even with a small number of people. It has the effect that it can be removed.

According to the deck plate support tool of the fourth aspect of the present invention, in addition to the effects of the invention of any one of the first to third aspects, the support means can be detached from the fixing means. Therefore, there is an effect that safety is high.

According to the deck plate support tool of the fifth aspect of the present invention, in addition to the effect of the invention of the fourth aspect, the bolt is difficult to deform. Therefore, after the slab construction, the bolt is loosened to fix the support means. There is an effect that the work of removing from the means can be easily performed. In addition, since a series of operations can be performed in a stable posture, such as tightening a bolt while supporting the support means from below, the operator's fatigue is reduced.

According to the deck plate support tool described in claim 6 of the present invention, since the support means is difficult to rotate even when a load of a concrete slab or deck plate acts, safety is further improved compared to the invention described in claim 5. Can be increased.

According to the deck plate support of the seventh aspect of the present invention, compared to the invention of any one of the first to sixth aspects, the upper surface of the support means is less likely to be cracked, and safety is improved. Are better.

According to the slab construction method described in claim 8 of the present invention, since the effect of the invention described in any one of claims 1 to 7 is exhibited, the concrete slab is formed at low cost, The deck plate can be easily recovered from the concrete slab after construction and reused.

(A) is a side view which shows the use condition of Example 1 of the deck plate support which concerns on embodiment of this invention, (b) is the sectional view on the AA line in (a). (A) And (b) is an external appearance perspective view of the driving hardware and square material which comprise the deck plate support of Example 1, respectively. (A) is a side view of the deck plate supported by the deck plate support of Example 1, (b) and (c) are two types of formwork members constituting the deck plate shown in (a). It is a top view. It is process drawing which shows the work procedure of the slab construction method using the deck plate support tool of Example 1. FIG. (A) thru | or (d) is a figure for demonstrating the work procedure at the time of constructing a concrete slab using the deck plate support of Example 1. FIG. (A) And (b) is a figure for demonstrating the operation | work procedure at the time of removing a deck plate, after forming a concrete slab using the deck plate support of Example 1. FIG. (A) is a side view which shows the use condition of Example 2 of the deck plate support which concerns on embodiment of this invention, (b) is CC sectional view taken on the line in (a). (A) And (b) is an external appearance perspective view of the placing hardware and square material which comprise the deck plate support of Example 2, respectively. (A) thru | or (d) is a figure for demonstrating the work procedure at the time of constructing a concrete slab using the deck plate support of Example 2. FIG. (A) And (b) is a figure for demonstrating the operation | work procedure at the time of removing a deck plate, after forming a concrete slab using the deck plate support of Example 2. FIG. (A) is a side view which shows the use condition of Example 3 of the deck plate support which concerns on embodiment of this invention, (b) is the DD sectional view taken on the line in (a). (A) And (b) is an external appearance perspective view of the rotation prevention member and square member which comprise the deck plate support of Example 3, respectively.

The structure of the deck plate support of the present invention and the slab construction method using the same will be specifically described with reference to FIGS.
In addition, when H-shaped steel is used as a beam of a structure, a pair of flanges will be arranged up and down. In the following embodiments, in particular, the deck plate support is attached to the flange arranged on the upper side. The case will be described. That is, the description of the case where the lower flange is targeted is omitted, but the action and effect of the present invention which will be described later are also exhibited in this case.

A deck plate support of Example 1 and a slab construction method using the same will be described with reference to FIGS. 1 to 6 (particularly, corresponding to

claims

1, 2, 5, and 8).
FIG. 1A is a side view showing the usage state of the deck plate support 1a of the present embodiment, and FIG. 1B is a cross-sectional view taken along line AA in FIG. 2 (a) and 2 (b) are perspective views showing the appearance of the driving hardware 2 and the square member 3 constituting the deck plate support 1a of FIG. 1, respectively.
3 (a) is a side view of the deck plate 6 supported by the deck plate support 1a. FIGS. 3 (b) and 3 (c) show the formwork members 7 constituting the deck plate 1a. 8 is a plan view of FIG. 3B and 3C correspond to views showing a state in which the deck plate 6 viewed in the direction indicated by the arrow B in FIG.

As shown in FIGS. 1 and 2, the deck plate support 1 a has a substantially “U” shape in a side view by a connection portion 2 c and two sandwiching portions 2 a and 2 b that are connected to and disposed opposite to each other. A hammer 2 formed so that the flange 5a of the H-shaped steel 5 can be inserted between the sandwiching portions 2a and 2b, and a square member 3 attached to the hammer 2 so that the end 6a of the deck plate 6 can be placed on the upper surface. And bolts 4a and 4b. And the screw holes 4c and 4d screwed with the volt | bolts 4a and 4b are formed in the clamping parts 2a and 2b of the driving hardware 2, respectively.

That is, the square member 3 constitutes a support means for the deck plate 6, and the driving hardware 2 constitutes a fixing means for attaching the square member 3 to the flange 5 a of the H-shaped steel 5.
In the present embodiment, the driving hardware 2 is used as the fixing means, but the fixing means is not necessarily made of metal, and for example, highly rigid plastic or wood can be used. In this embodiment, a sleeper is assumed as the square member 3. However, the sleeper 3 is not limited to wood, and may be made of metal or plastic. Furthermore, the support means may be any shape as long as the end portion 6a of the deck plate 6 can be placed on at least the upper surface. A plate-shaped member may be used.

FIG. 2A shows a state in which screw holes 4c and 4d having the same diameter are formed so as to face each other, but one of bolts 4a and 4b is not communicated with screw holes 4c and 4d. Therefore, the screw holes 4c and 4d do not have to be formed at positions facing each other. The diameters of the bolts 4a and 4b are not necessarily the same.
Further, when the gap between the clamping portions 2a, 2b and the flange 5a is small enough that the fixing means is not easily detached from the flange 5a of the H-shaped steel 5, the bolt 4a may be omitted. In this case, since the number of parts is reduced, the manufacturing cost of the deck plate support 1a is reduced, and workability when the deck plate support 1a is attached to the H-shaped steel 5 is improved. However, as shown in the present embodiment, in the case of a structure in which a clearance between the clamping portions 2a, 2b and the flange 5a is increased and the fixing means is fixed to the H-shaped steel 5 using the bolt 4a, the thickness of the flange 5a is There is an advantage that one deck plate support 1a can be used in common for a plurality of different H-shaped steels 5.

The square member 3 is formed with a through hole 4e through which the bolt 4b can be inserted from the side surface 3b to the side surface 3a and perpendicular to the side surface 3a. 1A, when the deck plate support 1a is attached to the flange 5a of the H-shaped steel 5, the height of the upper surface 6b of the deck plate 6 and the upper surface of the flange 5a of the H-shaped steel 5 are substantially the same. As described above, the deck plate mounting surface 3 c of the square member 3 is formed one step higher than the side surface 3 a that abuts against the clamping portion 2 b of the driving hardware 2.

As shown in FIGS. 3A to 3C, the deck plate 6 is made up of

formwork members

7 and 8 made of thin steel plates.

Formwork members

7 and 8 are reinforcing protrusions having a V-shaped cross-section that are similar to each other on the back surface side of

flat plate portions

9 and 10 whose upper surface 6b becomes a molding surface when placing concrete. 11 and 12 has a structure in which the

flat plate portions

9 and 10 are linearly extended in the front-rear direction.
The reinforcing protrusion 11 has a stepped structure having a small-diameter portion 11a and a large-diameter portion 11b, and each small-diameter portion 11a is disposed so as to be insertable with respect to each reinforcing protrusion 12. . And between the small diameter part 11a and the flat plate part 9, the slide allowable slit (not shown) is provided so that the flat plate part 10 can be inserted.

That is, when the mold member 7 is connected to the mold member 8 in such a manner that the small-diameter portion 11a of the reinforcing protrusion 11 is inserted into the reinforcing protrusion 12, the deck plate 6 is shown in FIG. ), The overall length is easily changed by sliding the

mold members

7 and 8 together as indicated by the arrow X. Therefore, it can be said that the deck plate 6 has a wide range of use after being separated and collected from the concrete slab and is the most suitable structure for reuse.

In the deck plate support 1a having such a structure, when concrete mixed in advance is poured into the upper surface 6b of the deck plate 6, it turns around the end portion 6a of the deck plate 6 and the concrete on the lower surface side. , And the concrete contacts only a part of the side surface 3a with respect to the square member 3, so that there is no possibility that a part of the square member 3 and the deck plate 6 are taken into the solidified concrete. .
In this case, since the deck plate 6 can be easily separated from the concrete slab, the deck plate 6 can be recovered and reused in a clean state with few scratches.

In addition, the deck plate support 1a has a simple structure in which each member constituting the deck plate support 1a is inexpensive and has a small number of points. Nevertheless, the deck plate 6 has the effect of being supported safely and reliably.
Furthermore, since no step is generated between the upper surface of the flange 5a of the H-shaped steel 5 and the upper surface 6b of the deck plate 6, use of useless concrete can be suppressed.
Therefore, in the deck plate support 1a, the manufacturing cost can be reduced and the cost of the concrete to be used can be kept low, thereby reducing the cost for the entire construction of the slab.

In addition, the deck plate support 1a has an effect that the square member 3 is fixed to the driving hardware 2 by inserting the bolt 4b into the through hole 4e and then tightening it into the screw hole 4d. Thereby, since the detachment of the square member 3 from the driving hardware 2 is prevented, safety is improved.
Further, since the axial direction of the bolt 4b is a vertical direction, a bending load based on the weight of the square member 3 is not easily generated in the bolt 4b. In this case, since the bolt 4b is not easily deformed, the bolt 4b can be easily loosened and the square member 3 can be removed from the hardware 2 after the slab construction.
Furthermore, since the direction in which the square 3 is supported is the same as the direction in which the bolt 4b is tightened, a series of operations can be performed in a stable posture, such as tightening the bolt 4b while supporting the square 3 from below. Therefore, worker fatigue is reduced.

Next, a concrete slab construction method using the deck plate support 1a will be described with reference to FIGS. 4 and 4 with reference to FIGS. The constituent elements shown in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof is omitted.
FIG. 4 is a process diagram showing an operation procedure when constructing the concrete slab 13 using the deck plate support 1a of the present embodiment. FIGS. 5 and 6 are views showing the attachment state of the deck plate support 1a to the flange 5a of the H-shaped steel 5 along the process diagram of FIG. 4 in order to explain the work procedure.

As shown in FIG. 4, first, in step S <b> 1, the driving hardware 2 is attached to the H-shaped steel 5. That is, the driving hardware 2 is installed so that the flange 5a is sandwiched from above and below by the sandwiching portions 2a and 2b, the bolt 4a screwed into the screw hole 4c is tightened, and the upper surface of the flange 5a is pressed by the lower end of the bolt 4a. Then, the driving hardware 2 is fixed to the H-shaped steel 5 (see FIG. 5A).
Next, in step S2, the through hole 4e is communicated with the screw hole 4d of the sandwiching portion 2b, and the bolt 4b is inserted into the through hole 4e from below with the side surface 3a being in contact with the lower surface of the sandwiching portion 2b. The square bar 3 is driven and fixed to the hardware 2 by inserting and tightening into the screw hole 4d (see FIG. 5B). Thereby, the mounting operation of the deck plate support 1a to the H-shaped steel 5 is completed.

In step S3, the deck plate 6 is adjusted to an appropriate length by sliding the

mold members

7 and 8, and then the end 6a of the deck plate 6 is placed on the deck plate placement surface 3c of the square member 3 ( (Refer FIG.5 (c)). Then, a polyurethane spacer (not shown) is installed in the gap E (see FIG. 1B) between the side surface 3a of the square member 3 and the flange 5a of the H-shaped steel 5.
In step S4, the concrete kneaded in advance is poured into the upper surface 6b of the deck plate 6 and the upper surface of the flange 5a of the H-shaped steel 5. This completes the concrete placement work. And the concrete slab 13 is formed because the placed concrete solidifies (refer FIG.5 (d)). The upper part of the driving hardware 2 and the bolt 4a are left in the concrete slab 13 as the concrete solidifies.

In step S5, the bolt 4b fastened to the clamping part 2b of the driving hardware 2 is loosened, extracted from the screw hole 4d and the through hole 4e, and the square member 3 is removed from the driving hardware 2 (see FIG. 6A). As a result, the restriction on the downward movement of the deck plate 6 is released, and the deck plate 6 can be easily separated from the concrete slab 13.
Therefore, in step S6, the deck plate 6 is removed from the concrete slab 13 (see FIG. 6B). Thereby, the construction work of the concrete slab 13 using the deck plate support 1a is completed.

Thus, according to the slab construction method using the deck plate support 1a, since the operation and effect of the deck plate support 1a already described are exhibited, the concrete slab 13 is constructed at low cost and after the construction. The deck plate 6 can be easily recovered from the concrete slab 13 and reused.

The deck plate support according to the second embodiment will be described with reference to FIGS. 7 to 10 (particularly corresponding to claims 3 and 4).
FIG. 7A is a side view showing the usage state of the deck plate support 1b of the present embodiment, and FIG. 7B is a cross-sectional view taken along the line CC in FIG. 7A. 8 (a) and 8 (b) are perspective views showing the appearance of the driving hardware 14 and the square member 15 constituting the deck plate support 1b of FIG. 7, respectively. In addition, about the component shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIGS. 7 and 8, the deck plate support 1 b is connected to the holding portions 14 a and 14 b opposed to each other and the holding portions 14 a and 14 b so as to form a substantially “U” shape in a side view. Connected to the holding portion 14b and the holding portion 14d connected to the holding portion 14b and having an L shape when viewed from the side. The flange 5a of the H-shaped steel 5 can be inserted between the holding portions 14a and 14b. Further, a driving tool 14 formed so that the square member 15 can be inserted inside the holding part 14b and the holding part 14d, and a square member 15 attached to the driving tool 14 so that the end 6a of the deck plate 6 can be placed on the upper surface, It consists of bolts 4a and 4b. In addition, the clamping part 14b and the holding | maintenance part 14d are formed so that the square member 15 can be clamped.
That is, in this embodiment, the square member 15 constitutes a support means for the deck plate 6, and the driving hardware 14 constitutes a fixing means for attaching the square member 15 to the flange 5 a of the H-shaped steel 5. Therefore, the clamping portions 14a and 14b and the connection portion 14c of the driving hardware 14 correspond to the clamping portions 2a and 2b and the connection portion 2c of the driving hardware 2, respectively.

In the driving hardware 14, a screw hole 4c that is screwed into the bolt 4a is formed in the holding portion 14a, and a screw hole 4d that is screwed into the bolt 4b is formed in the holding portion 14d connected to the holding portion 14b. .
In other words, in addition to the operation of the driving hardware 2 of the first embodiment, the driving hardware 14 has an operation of holding the square member 15 so as to hold the square member 15 from the side and the lower side. In this case, when one square member 15 is attached to or removed from the plurality of driving hardwares 14, those operations can be performed at a time. Therefore, work efficiency is good. Further, when the bolt 4b is removed from the screw hole 4d and extracted from the through hole 4e of the square member 15, the square member 15 is not immediately detached from the driving hardware 14 and dropped, which is safe.

On the other hand, the square member 15 has side surfaces 15a and 15b that are parallel to each other, side surfaces 15c and 15d that are orthogonal to the side surfaces 15a and 15b, and allows the bolt 4b to be inserted from the side surface 15c toward the side surface 15d. A through hole 4e is formed perpendicular to the side surface 15d. The through-hole 4e is formed so as to be able to communicate with the screw hole 4d in a state in which the square member 15 is sandwiched between the side surfaces 15a and 15b by the sandwiching portion 14b and the holding portion 14d of the driving hardware 14.
When the deck plate support 1b is attached to the flange 5a of the H-shaped steel 5 as shown in FIG. 7A, the height of the upper surface 6b of the deck plate 6 and the upper surface of the flange 5a of the H-shaped steel 5 are substantially the same. As described above, the deck plate mounting surface 15e of the square member 15 is formed one step higher than the side surface 15a that abuts against the sandwiching portion 14b of the driving tool 14.

Next, the construction method of the concrete slab 13 using the deck plate support 1b is demonstrated using FIG. 4, referring suitably FIG.9 and FIG.10. The components shown in FIGS. 1 to 8 are denoted by the same reference numerals, and the description thereof is omitted.
FIG. 9 and FIG. 10 are diagrams showing the attachment state of the deck plate support 1b to the flange 5a of the H-shaped steel 5 along the process diagram of FIG. 4 in order to explain the work procedure when constructing the concrete slab 13. It is.

As shown in FIG. 4, first, in step S <b> 1, the driving hardware 14 is attached to the H-shaped steel 5 so that the flange 5 a is sandwiched from above and below by the sandwiching portions 14 a and 14 b. Further, the bolt 4a screwed into the screw hole 4c is tightened, and the upper surface of the flange 5a is pressed by the lower end of the bolt 4a to fix the driving tool 14 to the H-shaped steel 5 (FIG. 9A). reference).
Next, in step S2, the square member 15 is driven in so that the screw hole 4d and the through hole 4e of the connecting portion 14e communicate with each other with the side surface 15a in contact with the lower surface of the holding portion 14b. And the holding portion 14d. Further, by inserting the bolt 4b through the through-hole 4e from the horizontal direction and tightening the screw 4d into the screw hole 4d, the square member 15 is fixed to the driving tool 14 (see FIG. 9B). Thereby, the mounting operation of the deck plate support 1b to the H-shaped steel 5 is completed.

In step S3, after adjusting the deck plate 6 to an appropriate length by sliding the

mold members

7 and 8, the end 6a of the deck plate 6 is placed on the deck plate placement surface 15e of the square member 15 ( (See FIG. 9C).
In step S4, the mixed concrete is poured into the upper surface 6b of the deck plate 6 and the upper surface of the flange 5a of the H-shaped steel 5. This completes the concrete placement work. And the concrete slab 13 is formed because the placed concrete solidifies (refer FIG.9 (d)). The upper portion of the driving hardware 14 and the bolt 4a are left inside the concrete slab 13 as the concrete solidifies.

In step S5, the bolt 4b fastened to the holding portion 14d of the driving hardware 14 is loosened and extracted from the screw hole 4d and the through hole 4e, and the square member 15 is removed from the driving hardware 14 (see FIG. 10A). As a result, the deck plate 6 is released from the restraint against the lateral movement and can be easily separated from the concrete slab 13.
Therefore, in step S6, the deck plate 6 is removed from the concrete slab 13 (see FIG. 10B). Thereby, the construction work of the concrete slab 13 using the deck plate support 1b is completed.

Thus, according to the slab construction method using the deck plate support 1b, the above-described operation and effect of the deck plate support 1b are exhibited. Therefore, as in the case of the first embodiment, the effect of performing the construction of the concrete slab 13 at low cost and facilitating the recovery and reuse of the deck plate 6 from the concrete slab 13 after the construction is exhibited.

The deck plate support of Example 3 will be described with reference to FIGS. 11 and 12 (particularly, corresponding to claims 6 and 7).
FIG. 11A is a side view showing the usage state of the deck plate support 1c of the present embodiment, and FIG. 11B is a cross-sectional view taken along line DD in FIG. 11A. 12 (a) and 12 (b) are perspective views showing the appearance of the rotation preventing member 16 and the square member 17 constituting the deck plate support 1c, respectively.
In addition, about the component shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIGS. 11 and 12, the deck plate support 1c includes the anti-rotation member 16 having the long hole 16b through which the bolt 4b is inserted in the deck plate support 1a of the first embodiment. Instead of this, a square member 17 is used.
The anti-rotation member 16 is a metal plate having a rectangular shape in plan view, and a long hole 16b is formed in the plane portion 16a along the longitudinal direction. The square member 17 has a substantially quadrangular prism shape, and a bolt 4b can be inserted from the side surface 17b toward the side surface 17a, and a through hole 4e is formed perpendicular to the side surface 17a. The side surface 17a is a surface with which the sandwiching portion 2b of the driving hardware 2 comes into contact. The side surface 17a is a bottom surface of the concave portion 18 provided so that the sandwiching portion 2b can be disposed with respect to the deck plate placement surface 17c. It is formed to be lower by one step than the surface 17c by the thickness of the sandwiching portion 2b.

Next, a concrete slab construction method using the deck plate support 1c will be described with reference to FIG. 4 while referring to FIGS. 11 and 12 as appropriate.
As shown in FIG. 4, first, in step S1, the driving hardware 2 is attached to the H-shaped steel 5 in the same manner as the case of the deck plate support 1a. Next, in step S2, the side surface 17a of the square member 17 is brought into contact with the lower surface of the sandwiching portion 2b so that the through hole 4e and the long hole 16b communicate with the screw hole 4d of the sandwiching portion 2b. The bolt 4b is inserted into the long hole 16b and the through hole 4e from below while the 16 flat portions 16a are in contact with the side surface 17b of the square member 17. Further, after adjusting the position of the anti-rotation member 16 in the longitudinal direction with respect to the square member 17 so that the end face 16c contacts the H-shaped steel 5, the bolt 4b is tightened into the screw hole 4d, and the square member 17 is fixed to the driving hardware 2. (See FIG. 11).

In step S3, the end portion 6a of the deck plate 6 is placed on the deck plate placement surface 17c of the square member 17 in the same manner as in the case of the deck plate support 1a. In the deck plate support 1c, since the sandwiching portion 2b of the driving hardware 2 is disposed in the recess 18 of the square member 17, the gap E is different from the case of the deck plate support 1a (see FIG. 1B). Does not occur. Therefore, it is not necessary to install a polyurethane spacer between the side surface 17 a of the square member 17 and the flange 5 a of the H-shaped steel 5.
Further, in step S4, concrete placement work is performed as in the case of the deck plate support 1a.

In step S3 or step S4, the load of the concrete slab 13 or the deck plate 6 is applied to the deck plate mounting surface 17c of the square member 17, thereby causing the arrow F in FIG. A rotation moment is generated to rotate the square member 17 in the direction indicated by. This rotational moment similarly occurs in the case of the deck plate support 1a. However, in the case of the deck plate support 1a, if the bolt 4b does not have sufficient bending rigidity, the bolt 4b bends and the square 3 As a result, the deck plate 6 may be detached from the deck plate placement surface 3c. On the other hand, in the deck plate support 1c, the rotation preventing member 16 has an action of preventing the rotation of the square member 17 against the above-described rotation moment. Therefore, the safety can be further enhanced as compared with the deck plate support 1a.

Further, in the deck plate support 1a, the stress caused by the above-mentioned rotational moment tends to concentrate on the contact portion between the side surface 3a of the square member 3 and the sandwiching portion 2b. There is a possibility of cracking. On the other hand, in the deck plate support 1c, the deck plate mounting surface 17c of the square member 17 comes into contact with the lower surface of the flange 5a, and the stress is difficult to concentrate on the contact portion between the side surface 17a of the square member 17 and the sandwiching portion 2b. That is, according to the deck plate support 1c, compared with the deck plate support 1a, the side surface 17a of the square member 17 is less likely to be cracked and is excellent in safety.

In step S5, the bolt 4b fastened to the clamping portion 2b of the driving hardware 2 is loosened and extracted from the screw hole 4d, the through hole 4e and the long hole 16b, and the anti-rotation material 16 and the square material 17 are removed from the driving hardware 2. Thereby, the restriction | limiting with respect to the downward movement of the deck plate 6 is cancelled | released, and it becomes possible to isolate | separate from the concrete slab 13 easily.
Finally, in step S6, the deck plate 6 is removed from the concrete slab 13 as in the case of the deck plate support 1a.

Thus, in the slab construction method using the deck plate support 1c, the above-described operation and effect of the deck plate support 1c are exhibited. Therefore, it is possible to reduce the construction cost of the concrete slab 13 and to easily collect and reuse the deck plate 6 from the concrete slab 13 after the construction.

The deck plate support according to the present invention is not limited to the structure shown in the above embodiment. For example, in Example 1, the bolt 4a is omitted, the bolt 4b is lengthened, and the bolt 4b screwed into the screw hole 4d is tightened to fix the square member 3 to the driving hardware 2 and the bolt 4b. It is good also as a structure which presses the lower surface of the flange 5a of the H-shaped steel 5 with a front-end | tip, and fixes the driving | operation metal fitting 2 to the H-shaped steel 5. FIG. In this case, since the number of parts is reduced, the manufacturing cost of the deck plate support can be reduced. Further, since only one bolt is required for tightening or the like, the working efficiency is improved.
Further, the sandwiching portions 2b and 14b can be arranged on the deck plate placement surface 3c of the square member 3 in the first embodiment or the deck plate placement surface 15c of the square member 15 in the second embodiment, similarly to the square member 17 in the third embodiment. In addition, the recess 18 may be formed so that the depth thereof is equal to the thickness of the sandwiching portions 2b and 14b. According to such a structure, the action and effect of the square member 17 described in the third embodiment are also exhibited in the deck plate support 1a of the first embodiment and the deck plate support 1b of the second embodiment.
In addition, as already stated, the deck plate 6 shown in the present embodiment is used for the formwork at the time of placing the concrete because it is widely used after being recovered from the concrete slab 13 and is easy to reuse. It is desirable. However, the present invention is not limited to this, and the deck plate support and the slab construction method using the same according to the present invention can be similarly applied to a deck plate having a structure in which the overall length cannot be adjusted.

The inventions described in claims 1 to 8 can be applied to floors and ceilings of multi-layer buildings.

DESCRIPTION OF SYMBOLS 1a Deck plate support tool 1b Deck plate support tool 1c Deck plate support tool 2 Driving metal 2a Holding part 2b Holding part 2c Connection part 3 Square material 3a Side surface 3b Side surface 3c Deck plate mounting surface 4a Bolt 4b Bolt 4c Screw hole 4d Screw hole 4e Through hole 5 H-shaped steel 5a Flange 6 Deck plate 6a End 6b Upper surface 7 Mold member 8 Mold member 9 Flat plate 10 Flat plate 11 Reinforcing ridge 11a Small diameter portion 11b Large diameter portion 12 Reinforcing ridge 13 Concrete Slab 14 Driving hardware 14a Clamping portion 14b Clamping portion 14c Connection portion 14d Holding portion 15 Square member 15a Side surface 15b Side surface 15c Side surface 15d Side surface 15e Deck plate mounting surface 16 Anti-rotation member 16a Flat portion 16b Long hole 16c End surface 17 Square member 17 Side 17b side 17c deck plate mounting surface 18 recess

Claims

A deck plate support for supporting a deck plate (6) when constructing a concrete slab (13) in a building having a beam of H-shaped steel (5) arranged so that the flange (5a) is horizontal. (1a-1c),
Fixing means (2) having a pair of sandwiching portions (2a, 2b, 14a, 14b) arranged to face each other and having a U-shape when viewed from the side so that the flange (5a) can be inserted therein. 14)
The fixing means (2, 14) is detachably attached to the fixing means (2, 14), and the deck plate mounting surface (3c, 15e, 17c) is provided with support means (3, 15, 17) provided on the top. A deck plate support (1a to 1c) characterized by the above.
The support means (3, 17) includes an upper surface (6b) of the deck plate (6) mounted on the deck plate mounting surface (3c, 17c) while being attached to the fixing means (2). The deck plate support (1a, 1c) according to claim 1, characterized in that the height of the upper surface of the flange (5a) coincides.
The fixing means (14) includes a holding portion (14d) connected to one of the pair of holding portions (14a, 14b), and an inner side of the holding portion (14d) and the holding portion connected thereto. The deck plate support (1b) according to claim 1 or 2, characterized in that the support means (15) can be inserted into the deck plate support.
A bolt (4b) for fixing the support means (3, 15, 17) to the fixing means (2, 14);
A screw hole (4d) screwed into the bolt (4b) is formed in the fixing means (2, 14),
The through hole (4e) for inserting the bolt (4b) is formed in the support means (3, 15, 17) so as to communicate with the screw hole (4d). The deck plate support (1a to 1c) according to any one of claims 3 to 3.
The deck plate support according to claim 4, wherein the screw hole (4d) is formed on a side of the pair of sandwiching portions (2a, 2b) located below the flange (5a). 1a, 1c).
It is provided with a rotation preventing member (16) in which a long hole (16b) for inserting the bolt (4b) into the flat surface portion (16a) is formed in a long shape along the longitudinal direction. The deck plate support (1c) according to claim 5.
Of the pair of clamping parts (2a, 2b, 14a, 14b), the clamping parts (2b, 14b) on the side located below the flange (5a) can be arranged, and the clamping parts (2b, 14b) A recess (18) is formed on the deck plate mounting surface (3c, 15e, 17c) of the support means (3, 15, 17) so that the depth is equal to the thickness of the support means (3, 15, 17). The deck plate support (1a to 1c) according to any one of claims 1 to 6.
In a building having a beam of H-shaped steel (5) arranged so that the flange (5a) is horizontal, a concrete slab using the deck plate support according to any one of claims 1 to 7. A slab construction method for forming (13),
Attaching the fixing means (2, 14) to the flange (5a);
Attaching the support means (3, 15, 17) detachably to the fixing means (2, 14);
Installing the deck plate (6) on the upper surface (3c, 15e, 17c) of the support means (3, 15, 17);
Pouring concrete previously mixed into the upper surface (6b) of the deck plate (6);
Removing the support means (3, 15, 17) from the fixing means (2, 14) after the concrete has solidified;
And a step of removing the deck plate (6) from the solidified concrete.