JP5834165B2 - Deck plate and manufacturing method thereof - Google Patents

Description

  The present invention relates to a deck plate used for forming a concrete slab on a floor, a ceiling, or the like of a building and a manufacturing method thereof, and more particularly to a deck plate that is difficult to deform and can be easily reused.

In a building using reinforced concrete or steel reinforced concrete as a structural material, slabs are formed on a floor, a ceiling, or the like by placing concrete on a formwork temporarily provided on a beam or the like. In many cases, a deck plate obtained by processing a steel plate is used as the mold.
Since the deck plate finishes its role when the concrete is hardened, it is desirable that the deck plate be quickly separated from the concrete and reused after slab construction.

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 a deck plate that can be adjusted, reused, and diverted under the name “sliding deck plate and construction method” and a slab construction method using the same. Yes.
The invention disclosed in Patent Document 2 includes two types of deck plates in which a slide holder is provided on the lower surface of a plate body whose upper surface is a temporary floor surface. It has a structure that can be connected to each other in a male and female shape.
In the deck plate having such a structure, since the length of the deck plate can be adjusted according to the interval between the slab forming regions, the range of objects that can be diverted is wide and excellent in versatility.

Japanese Patent No. 3781425 JP 2005-54354 A

  However, in the invention disclosed in Patent Document 1 which is the above-described prior art, near the boundary between the end portion of the ridge portion and the mounting allowance of the formwork member due to the weight of concrete placed on the upper surface of the temporary floor plate Since bending stress is concentrated on the flat plate, there is a problem that the flat plate is cracked or partially deformed and cannot be reused. Moreover, since the protrusion part joined by welding etc. to the flat plate will deform | transform when isolate | separating from a flat plate, there existed a subject that only the protrusion part could not be reused. Moreover, in the part which is not joined to a flat plate, the cross-sectional shape of a protrusion part is easy to be distorted, and it is necessary to perform the operation | work which slides a protrusion part carefully. Therefore, there is a problem that workability when adjusting the length of the deck plate is poor.

  In the invention disclosed in Patent Document 2, bending stress concentrates on the plate body near the end of the slide holder due to the weight of the concrete placed on the upper surface of the deck plate. In some cases, the steel plate was deformed and could not be reused even if the deck plate was recovered after slab construction. Further, since the slide holder is easily deformed when separated from the plate body, it is difficult to reuse the slide holder alone. Furthermore, since the slide holder having a shape with an open upper surface has low rigidity against torsional deformation or the like, the cross-sectional shape tends to be distorted when the slide holders are slid relative to each other. That is, since it is necessary to perform the work carefully, there is a problem that the length of the deck plate cannot be adjusted efficiently in a short time.

  The present invention has been made in response to such a conventional situation, and it is possible to efficiently adjust the entire length, and to collect and repeatedly use the concrete slab after it has been constructed. An object of the present invention is to provide a deck plate and a method of manufacturing the same.

  In order to achieve the above object, a third aspect of the present invention is a deck plate used as a mold when forming a concrete slab on a floor of a structure, and is pushed flat from one end to a predetermined length. The first and second square pipes that are crushed to form flat portions, and the upper surface of the first square pipe are joined to the lower surface except for a predetermined range along the longitudinal direction from the other end. A first flat plate, a second flat plate in which the upper surface of the second square pipe is joined to the lower surface, and at least along the longitudinal direction from the vicinity of one end inside the first square pipe and the second square pipe. An elongated member installed so as to exceed the flat portion, the first square pipe is formed to be insertable into the second square pipe, and the first square pipe and the second square pipe are opened. The first flat plate and the second plate can be inserted between the other ends. Each of the first square pipe and the second square pipe is joined to the plate, and a bellows-like folded part is formed on one side of the first square pipe and the second square pipe so as to extend at least from the flat part along the longitudinal direction from one end. To do.

In the deck plate having such a structure, the lower surfaces of the first square pipe and the second square pipe are flattened from the one end flattened in a flat shape to a predetermined length along the longitudinal direction, and the subsequent slope. Will have a part. In addition, when installing this deck plate in a structure as a formwork, this flat part contacts the square material etc. which support a deck plate.
Furthermore, for example, in the ridge portion having a V-shaped cross section as in the invention described in Patent Document 1, the upper portion is open, and the rigidity against torsional deformation is low, so that it is joined to the flat plate portion. Parts that are not easily deformed. In addition, when the ridge portion is separated from the flat plate portion, the cross-sectional shape is easily deformed.
In addition, when concrete is placed on the upper surfaces of the first flat plate and the second flat plate, noro (cement was kneaded with water only) leaking from the gap between the lower surface of the first flat plate and the upper surface of the second flat plate. In the state) flows along the lower surfaces of the first flat plate and the second flat plate and flows into the ridge portion from the opened upper portion. This nose solidifies in a state of adhering to the inner wall of the ridge, and becomes an obstacle when inserting other ridges. As a result, the deck plate cannot be reused.

On the other hand, in the deck plate of the present invention, the first square pipe and the second square pipe have a remarkably high rigidity against torsional deformation as compared with the above-described protrusion, so the first flat plate and Even if it is not joined to the second flat plate, deformation is unlikely to occur. That is, in the deck plate of the present invention, although the first square pipe is not joined to the first flat plate in a predetermined range along the longitudinal direction from the other end, for example, the other end of the first pipe is connected to the second plate. Even if the first square pipe is inserted and slid, the cross-sectional shape of the first square pipe is not likely to be deformed. Even when the first square pipe and the second square pipe are separated from the first flat plate and the second flat plate, their cross-sectional shapes are hardly deformed. Further, since the upper portions of the first square pipe and the second square pipe are not opened, the above-mentioned slot is transmitted along the lower surfaces of the first flat plate and the second flat plate, and the first square pipe and the second square pipe are connected. The situation that the operation of adjusting the length of the deck plate by sliding the first square pipe inserted into the second square pipe is not obstructed by flowing into the square pipe and solidifying it does not occur. .
Further, when concrete is placed on the upper surface of the deck plate, stress concentration tends to occur at the boundary between the flat portion and the inclined portion on the lower surface of the first square pipe and the second square pipe. However, in the deck plate of the present invention, since the rigidity at the boundary between the flat portion and the inclined portion is increased by the bellows-like folded portion, breakage or deformation hardly occurs in the portion.
In addition, the long member has an effect that the rigidity at the boundary between the flat portion and the inclined portion is further increased.

The invention according to claim 5 is a method of manufacturing a deck plate used as a mold when forming a concrete slab on a floor of a structure, and the first square pipe and the first square pipe Forming a V-shaped groove having a predetermined length from one end along the longitudinal direction of each of the second square pipes formed so as to be insertable inside; A step of installing a long member inside the first square pipe and the second square pipe so as to exceed at least the flattened portion from the vicinity of one end; A flat portion is crushed flat in a range not exceeding the portion where the V-shaped groove is formed from one end along the longitudinal direction with respect to the lower surfaces orthogonal to the pair of side surfaces of the one square pipe and the second square pipe. Forming the first and first Joining the upper surface of the square pipe to the lower surface of the first flat plate excluding a predetermined range from the other end in the longitudinal direction, and joining the upper surface of the second square pipe to the lower surface of the second flat plate And a process.
According to such a manufacturing method of the deck plate, in the first square pipe and the second square pipe, a part of the pair of side surfaces is deformed so as to be folded in a bellows shape according to the V-shaped groove, thereby forming the folding portion. In addition, the lower surface is deformed without any cracks or the like in the pressed portion, and a flat portion is formed in a range not exceeding the folding portion along the longitudinal direction from one end. Further, the present invention captures the invention of the object described in claim 3 as the invention of the method, and therefore has the same action as the invention described in claim 3.
Moreover, the folding part formed from the V-shaped groove acts so as to sandwich and fix the long member from above and below together with the inner surfaces of the first square pipe and the second square pipe.

As described above, according to the deck plate of the third aspect of the present invention, for example, the other end of the first square pipe is inserted into the second square pipe, and the first square pipe is connected to the second square pipe. When the first square pipe is slid with respect to the square pipe, the cross-sectional shape of the first square pipe is not easily distorted even in a portion that is not joined to the first flat plate over the predetermined range from the other end. The adjustment work can be performed repeatedly and safely. Further, after the concrete slab is constructed, the deck plate is collected, and the first square pipe and the second square pipe are separated when the first square pipe and the second square pipe are separated from the first flat plate and the second flat plate. Since the cross-sectional shape of the square pipe is not easily distorted, the deck plate can be used repeatedly multiple times. Furthermore, since the square pipes that flow into the first square pipe and the second square pipe and solidify there is no possibility that the square pipes cannot be used, the collected deck plates can be effectively reused. .
In addition, the first square pipe and the second square pipe are unlikely to be damaged or deformed.

According to the deck plate manufacturing method of the fifth aspect of the present invention, in addition to the same effects as the third aspect of the invention, the deck plate of the third aspect can be easily realized. There is an effect.
In addition, since the long member is fixed by the folding portion, there is no possibility that the long member is inadvertently detached from the first square pipe or the second square pipe during the manufacture of the deck plate or after the manufacture of the deck plate. That is, according to the manufacturing method of the present invention, a safe deck plate can be easily manufactured.

(A) is a side view of the deck plate which concerns on embodiment of this invention, (b) and (c) is a top view of two types of formwork members which comprise the deck plate shown to the same figure (a) It is. (A) is an external appearance perspective view of the mold member which comprises the deck plate shown in FIG. 1, (b) and (c) are B direction arrow views and C direction arrow views in the same figure (a), respectively. It is. (A) And (b) is the D direction arrow directional view and EE arrow directional cross-sectional view in Fig.2 (a), respectively. It is process drawing which shows the manufacturing method of the deck plate which concerns on embodiment of this invention. (A) And (b) is a figure for demonstrating the method to manufacture a deck plate along the process drawing of FIG. (A) thru | or (d) is a figure for demonstrating the use condition of the deck plate which concerns on embodiment of this invention.

The deck plate and the manufacturing method thereof according to the present invention will be specifically described with reference to FIGS.
Moreover, the usage method of the deck plate of this invention is demonstrated, referring to FIG. 6 for the case where it installs in the upper side flange of the H-shaped steel used as a beam of a structure.

The structure of the deck plate of the present embodiment will be described with reference to FIGS. 1 to 3 (particularly corresponding to claim 3).
FIG. 1A is a side view of the deck plate of this embodiment, and FIGS. 1B and 1C are diagrams showing two types of formwork members constituting the deck plate shown in FIG. It is a top view. 2 (a) is an external perspective view of the formwork member constituting the deck plate shown in FIG. 1, and FIGS. 2 (b) and 2 (c) are arrows in the direction B in FIG. 2 (a), respectively. It is a view and a C direction arrow view. 3 (a) and 3 (b) are a view in the direction of arrow D and a cross-sectional view in the direction of arrow EE in FIG. 2 (a), respectively.
1 (b) and 1 (c) correspond to views showing a state in which the deck plate 1 viewed in the direction indicated by the arrow A in FIG.

As shown in FIGS. 1 (a) to 1 (c), the deck plate 1 is composed of steel plate mold members 2 and 3 having a thickness of about 0.8 mm. Formwork members 2 and 3 are flat plates 4 and 5 whose upper surfaces 4a and 5a become molding surfaces when placing concrete, and square pipes 6 and 7 joined to lower surfaces 4b and 5b of flat plates 4 and 5 by welding. It is constituted by.
Each of the square pipes 6 and 7 is pressed and deformed in a flat shape at one end, and a long steel plate member 8 (see FIG. 2) so as to close the end portion (hereinafter referred to as flat ends 6b and 7b). Is inserted inside. And the outer diameter of the square pipe 6 is smaller than the outer diameter of the square pipe 7, and the opening end 6a is formed so that it can be penetrated with respect to the opening end 7a.
The method of joining the square pipes 6 and 7 to the flat plates 4 and 5 is not limited to welding, and other methods such as adhesion or fixing with rivets or screws may be used. Furthermore, the flat plates 4 and 5, the square pipes 6 and 7, and the long member 8 are not limited to those made of steel plates, but may be a metal such as aluminum or a molded product such as fiber reinforced resin.

The upper surface 6c of the square pipe 6 (see FIG. 2A) is spot-welded to the flat plate 4 at two locations near the center in the longitudinal direction and near the flat end 6b. 2 (a) is spot-welded to the flat plate 5 at three locations near the center in the longitudinal direction and near both ends. That is, in the mold member 2, the flat plate 5 is fixed to a certain length between the lower surface 4b of the flat plate 4 and the upper surface 6c of the square pipe 6 so that the square pipe 7 of the mold member 3 is inserted into the square pipe 6. Can only be inserted.
In addition, the location which joins the square pipes 6 and 7 to the flat plates 4 and 5 is not limited to what was shown to the present Example. That is, the square pipe 6 may be structured to be joined to the lower surface 4b of the flat plate 4 except for a predetermined range along the longitudinal direction from the opening end 6a.

In this way, the deck plate 1 connects the mold member 2 to the mold member 3 so that the open end 6a of the square pipe 6 is inserted into the open end 7a of the square pipe 7, and FIG. As shown by the arrow X, the overall length can be easily adjusted by sliding the mold members 2 and 3 with each other. That is, it can be said that the deck plate 1 has a wide range of use after being separated and collected from the concrete slab and is the most suitable structure for reuse.
Since the flat plates 4 and 5 are as thin as about 0.8 mm, the flat plate 5 is inserted between the lower surface 4 b of the flat plate 4 and the upper surface 6 c of the square pipe 6 and a part of the flat plates 4 and 5 is overlapped. Thereafter, even when concrete is placed on the upper surfaces 4 a and 5 a, there is no possibility that the concrete enters between the lower surface 4 b of the flat plate 4 and the upper surface 5 a of the flat plate 5.

2 and 3, the lower surfaces 6d and 7d of the square pipes 6 and 7 are provided with two flat portions 9a and 9b parallel to the upper surfaces 6c and 7c, and the flat portions on the flat ends 6b and 7b side. The distance between 9a and the upper surfaces 6c and 7c is shorter than the distance between the flat portion 9a on the opening ends 6a and 7a side and the upper surfaces 6a and 7a. Therefore, an inclined portion 9c is formed between the flat portions 9a and 9b.
Also, bellows-like folded portions are formed on the side surfaces 6e, 6e and the side surfaces 7e, 7e connecting the upper surfaces 6c, 7c and the lower surfaces 6d, 7d of the square pipes 6, 7 so as to reach the inclined portion 9c beyond the flat portion 9a. 10a and 10b are formed.
The long member 8 is installed so that one end closes the flat ends 6b and 7b and the other end extends beyond the flat portion 9a to reach the inclined portion 9c, and is formed by the folding portions 10a and 10a and the upper surfaces 6c and 7c. It is fixed so as to be sandwiched from above and below.

  Instead of the square pipes 6 and 7, when using the ridge portion in the invention described in the above-mentioned Patent Document 1, the ridge portion has a V-shaped cross section, and the upper portion is open, The rigidity against torsional deformation is low, and deformation is likely to occur in portions that are not joined to the flat plate portions 4 and 5. Further, when the deck plate 1 is recovered and the ridges are separated from the flat plate portions 4 and 5, the cross-sectional shape thereof is easily deformed, and it is highly likely that it is difficult to reuse the ridges. Further, when concrete is placed on the upper surfaces 4a and 5a of the flat plates 4 and 5, noro (in a state where the cement is kneaded with water only) leaks from the gap between the lower surface 4b of the flat plate 4 and the upper surface 5a of the flat plate 5. It flows along the lower surfaces 4b and 5b of the flat plates 4 and 5 from the opened upper portion into the ridge portion. This nose solidifies in a state of adhering to the inner wall of the ridge, and becomes an obstacle when inserting other ridges. Therefore, even if the deck plate 1 is collected, it may not be reused.

  On the other hand, the square pipes 6 and 7 have remarkably high rigidity against torsional deformation as compared with the above-described protrusions, and are not easily deformed even at locations not joined to the flat plates 4 and 5. That is, in the deck plate 1 having the above structure, the square pipe 6 is not joined to the flat plate 4 in a predetermined range along the longitudinal direction from the opening end 6a. Even when the square pipe 6 is slid, there is no possibility that the cross section of the square pipe 6 is deformed at the location. Therefore, the operation of adjusting the entire length of the deck plate 1 can be performed repeatedly and safely. Further, even when the deck plate 1 is recovered and the square pipes 6 and 7 are separated from the flat plates 4 and 5, their sectional shapes are not easily distorted, so that the separated square pipes 6 and 7 can be reused.

  In addition, since the upper portions of the square pipes 6 and 7 are not opened, the above-mentioned slot flows along the lower surfaces 4b and 5b of the flat plates 4 and 5 and flows into the square pipes 6 and 7 to be solidified. The situation in which the operation of adjusting the length of the deck plate 1 by sliding the square pipe 6 inserted through 7 is not hindered. Therefore, the recovered deck plate 1 and square pipes 6 and 7 can be effectively reused.

Next, a method for manufacturing the deck plate 1 will be described with reference to FIG. 5 with reference to FIG. 5 (particularly, corresponding to claim 5).
FIG. 4 is a process diagram showing a method for manufacturing the deck plate 1, and FIGS. 5A and 5B are diagrams for explaining the method for manufacturing the deck plate 1. In addition, about the component shown in FIG. 1 thru | or FIG. 3, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 4, first, in step S1, a steel square pipe 11 having a rectangular cross section and a steel square pipe 12 having a rectangular cross section and formed so that the steel square pipe 11 can be inserted therein are provided. Each is installed inside the concave groove 16 a of the press die 16. Then, the punch 14a and the die 14b having a W-shaped cross section are pressed against the side surfaces 13a and 13a constituting a pair of long sides of the rectangular shape, and the core 14c is inserted into the steel square pipes 11 and 12, respectively. Thereafter, the punch 14a is moved in a direction orthogonal to the side surface 13a, and two V-shaped grooves 15a and 15b having a predetermined length are formed from one end along the longitudinal direction of the steel square pipes 11 and 12. It forms in the side surfaces 13a and 13a (refer Fig.5 (a)).
In step S2, the steel plate long member 8 is inserted into the steel square pipes 11 and 12 through the open ends 11a and 12a, and is installed so that one side is in contact with the inner side of the side surface 13b (FIG. 5). (See (b)). The long member 8 is slightly narrower than the inner diameters of the side surfaces 13a and 13a of the steel square pipes 11 and 12, and one end of the long member 8 is aligned with the open ends 11a and 12a. 12, the other end has a length sufficient to exceed the flat portion 9 a.

  In Step S3, the square pipes 6 and 7 are formed by pressing and deforming the steel square pipes 11 and 12 over a predetermined length from one end using the press die 16. Specifically, as shown in FIG. 5B, the steel square pipes 11 and 12 described above are installed inside the concave groove 16a of the press die 16, and then the punch 17 having a trapezoidal shape in a side view is formed on the side surface 13c. Then, the punch 17 is moved in a direction orthogonal to the side surface 13c, and the steel square pipes 11 and 12 are crushed in a flat shape from one end to a predetermined length along the longitudinal direction. A flat portion 9a and an inclined portion 9c (see FIG. 3) connecting the flat portion 9a and the flat portion 9b are formed. Thereby, the steel square pipes 11 and 12 which have an open end and a flat end and in which the elongate member 8 is inserted in the flat end side are formed. That is, according to such a manufacturing method, the side surface 13c is deformed without difficulty, without causing a crack or the like at a location where the steel square pipes 11 and 12 are pressed. Therefore, the square pipes 6 and 7 can be easily manufactured.

  The side surfaces 13a and 13a are deformed so as to be folded in a bellows shape according to the two V-shaped grooves 15a and 15b because the outward deformation is restrained by the inner wall surface of the concave groove 16a of the press die 16. Then, the folding portions 10a and 10b are formed. At this time, among the folding parts 10a and 10b, the folding part 10a that abuts on one side of the long member 8 holds the long member 8 from above and below together with the side surface 13b of the steel square pipes 11 and 12 so as to be fixed. Works. Therefore, there is no possibility that the elongate member 8 is carelessly detached from the steel square pipes 11 and 12 during the manufacture of the deck plate 1. Similarly, after the deck plate 1 is manufactured, there is no fear that the long member 8 falls out of the square pipes 6 and 7. That is, according to the manufacturing method, the deck plate 1 having excellent safety can be easily manufactured.

  In step S4, the square pipes 6 and 7 formed from the steel square pipes 11 and 12 in steps S1 to S3 are fixed to the flat plates 4 and 5, respectively. Specifically, spot welding is performed on the lower surface 4 b of the flat plate 4 at two locations near the center in the longitudinal direction of the upper surface 6 c of the square pipe 6 and in the vicinity of the flat end 6 b, and the square pipe 7 is bonded to the lower surface 5 b of the flat plate 5. Spot welding is performed at three locations near the center in the longitudinal direction of the upper surface 7c and near both ends. Thereby, the formwork members 2 and 3 are formed.

Next, a method for using the deck plate 1 will be described with reference to FIG.
FIGS. 6A to 6D are views for explaining the usage state of the deck plate 1. In addition, about the component shown in FIG. 1 thru | or FIG. 3, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
For example, the deck plate 1 is attached to the H-shaped steel 19 via a deck plate support 18 including a driving hardware 20, a square member 21, and a rotation preventing member 24. The driving hardware 20 is installed so that the flange 19a is sandwiched from above and below by the sandwiching portions 20a and 20b, and then the bolt 22a screwed into the screw hole 22c is tightened to press the upper surface of the flange 19a with the lower end of the bolt 22a. Thus, it fixes with respect to the H-shaped steel 19 (refer Fig.6 (a)).

The square member 21 communicates the through hole 22e and the elongated hole (not shown) of the rotation preventing member 24 with the screw hole 22d of the sandwiching portion 20b, and makes the side surface 21a contact the lower surface of the sandwiching portion 20b and rotate. With the flat portion (not shown) of the prevention member 24 in contact with the side surface 21c of the square member 21, the bolt 22b is inserted into the long hole and the through hole 22e of the rotation prevention member 24 from below and tightened into the screw hole 22d. By being inserted, it is fixed to the driving hardware 20 (see FIG. 6B).
After the deck plate 1 is adjusted to an appropriate length by sliding the mold members 2 and 3, the flat portion 9a is placed on the deck plate placement surface 21b of the square member 21 (FIG. 6C). reference).

Concrete mixed in advance is poured into the upper surfaces 4a and 5a of the flat plates 4 and 5 constituting the deck plate 1 and the upper surface of the flange 19a of the H-shaped steel 19. As the concrete solidifies, a concrete slab 23 is formed (see FIG. 6D). Thereafter, the upper portion of the driving hardware 22 and the bolt 22a are left in the concrete slab 23 as the concrete is solidified.
Thus, when concrete is placed on the upper surfaces 4a and 5a of the flat plates 4 and 5, stress concentration tends to occur at the boundary between the flat portion 9a and the inclined portion 9c on the lower surfaces 6d and 7d of the square pipes 6 and 7. However, in the deck plate 1 of the present invention, the bellows-like folded portions 10a and 10b and the long member 8 act so as to increase the rigidity at the boundary between the flat portion 9a and the inclined portion 9c. And deformation hardly occurs.

  In addition, the deck plate 1 loosens the bolt 22b fastened to the clamping part 20b of the driving hardware 20 and removes it from the screw hole 22d, the through hole 22e, and the long hole of the rotation preventing member 24, and removes the rotation preventing member 24 and the square member 21. When it is removed from the driving hardware 20, the restraint against the downward movement is released, so that it can be easily separated from the concrete slab 23. And since the collect | recovered deck plate 1 is hard to produce a breakage and a deformation | transformation in the square pipes 6 and 7 as mentioned above, it can be used repeatedly in multiple times.

  The invention described in claim 3 and claim 5 can be applied when a concrete slab is constructed on a floor or a ceiling of a multi-layered building.

DESCRIPTION OF SYMBOLS 1 Deck plate 2 Formwork member 3 Formwork member 4 Flat plate 4a Upper surface 4b Lower surface 5 Flat plate 5a Upper surface 5b Lower surface
6 square pipe 6a open end 6b flat end 6c upper surface 6d lower surface 6e side surface 7 square pipe 7a open end 7b flat end 7c upper surface 7d lower surface 7e side surface 8 long member 9a flat portion 9b flat portion 9c inclined portion 10a folding portion 10b folding portion 11 Steel square pipe 11a Open end 12 Steel square pipe 12a Open end 13a Side face 13b Side face 13c Side face 14a Punch 14a Die 14c Core 15a V-shaped groove 15b V-shaped groove 16 Press die 16a Concave groove 17 Punch 18 Deck plate support 19 H-shaped steel 19a Flange 20 Driving hardware 20a Clamping portion 20b Clamping portion 21 Square member 21a Side surface 21b Deck plate mounting surface 21c Side surface 22a Bolt 22b Bolt 22c Screw hole 22d Screw hole 22e Through hole 23 Concrete slab 24 Anti-rotation member

Claims (2)

A deck plate (1) used as a formwork when forming a concrete slab on a floor of a structure,
A first square pipe (6) and a second square pipe (7) that are flattened from one end (6b, 7b) over a predetermined length to form a flat portion (9a);
A first flat plate in which the upper surface (6c) of the first square pipe (6) is joined to the lower surface (4b) except for a range from the other end (6a) to a predetermined length;
A second flat plate (5) in which the upper surface (7c) of the second square pipe (7) is joined to the lower surface (5b);
Inside the first square pipe (6) and the second square pipe (7), respectively, from the vicinity of the one end (6b, 7b) to extend at least the flat part (9a) along the longitudinal direction. An elongated member (8) installed inside,
The first square pipe (6) is formed so as to be able to be inserted into the second square pipe (7).
Said 1st square pipe (6) and said 2nd square pipe (7) are with respect to said 1st flat plate (4) and said 2nd flat plate (5) so that the other open ends can be penetrated. Each joined
Bellows-like folds (10a, 10b) are formed in the longitudinal direction from the one end (6b, 7b) on the side surfaces (6e, 7e) of the first square pipe (6) and the second square pipe (7), respectively. A deck plate (1) characterized in that the deck plate (1) is formed so as to extend at least along the flat portion (9a). A method of manufacturing a deck plate (1) used as a mold when forming a concrete slab on a floor of a structure,
One end (6b) along the longitudinal direction of each of the first square pipe (6) and the second square pipe (7) formed so that the first square pipe (6) can be inserted therein. 7b), forming a V-shaped groove (10a, 10b) of a predetermined length on a pair of opposing side surfaces (6e, 7e);
Subsequent to the step of forming the V-shaped grooves (10a, 10b), inside the first square pipe (6) and the second square pipe (7) from the vicinity of the one end (6b, 7b). A step of installing the long member (8) so as to exceed at least the flattened portion;
The lower end (6d, 7d) perpendicular to the pair of side surfaces (6e, 7e) of the first square pipe (6) and the second square pipe (7), respectively, the end ( 6b, 7b) a step of pressing and deforming into a flat shape in a range not exceeding the portion where the V-shaped groove (10a, 10b) is formed;
Joining the upper surface (6c) of the first square pipe (6) to the lower surface (4b) of the first flat plate (4) except for a predetermined range along the longitudinal direction from the other end (6a); ,
Joining the upper surface (7c) of the second square pipe (7) to the lower surface (5b) of the second flat plate (5), and manufacturing the deck plate (1) .

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