JP7457552B2 - deck plate - Google Patents

Description

The present invention relates to deck plates for use in reinforced concrete structural floors, etc.

BACKGROUND OF THE INVENTION Flat deck plates are used as formwork for concrete structures at construction sites where concrete slabs forming the floors and ceilings of buildings are constructed. The deck plate is installed so as to span between the beams, and both ends of the deck plate are fixed to the upper surfaces of the beams. As for the structure of such a deck plate, for example, a flat slab support part is provided between a plurality of ribs arranged in one direction, and this slab support part has trapezoidal ribs with protrusions to increase bending rigidity. A configuration in which a plurality of are formed along the longitudinal direction is known (see, for example, Patent Document 1).

In addition, for such deck plates, designs have been proposed in which protrusions are provided on the flat plate portion in order to improve cross-sectional performance without significantly increasing weight.

JP 2017-150132 Publication

However, although the cross-sectional performance of the deck plate in the longitudinal direction is improved by providing the protrusions that can be considered as stiffening ribs as described above, it is said that in the width direction of the deck plate, the flat plate-like portion is deflected. There was an issue.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a deck plate that can suppress deflection in the width direction while improving cross-sectional performance in the longitudinal direction of the deck plate. .

In order to solve the above problems, an aspect of the present invention is a deck plate in which a flat plate-like surface portion and a rib are alternately and continuously formed in the width direction, and the surface portion includes a flat portion and a rib. The flat part has a protruding portion formed to protrude along the longitudinal direction from one side of the flat part, and a plurality of bulges formed to protrude from one side of the flat part along the width direction.

Moreover, it is preferable that a plurality of the bulges are formed at intervals in the longitudinal direction.

Further, it is preferable that the bulging portion extends in a direction substantially perpendicular to the extending direction of the protruding portion.

Further, it is preferable that the bulging portion protrudes from a surface of the flat portion opposite to the direction in which the protruding portion protrudes.

Further, it is preferable that the bulging portion has a protruding height that is approximately the same as the protruding height of the protruding portion.

According to the aspect of the present invention, it is possible to suppress deflection in the width direction while improving the cross-sectional performance of the deck plate in the longitudinal direction.

It is a perspective view showing the composition of the deck plate concerning an embodiment. (a) It is a sectional view showing a state in which another deck plate is placed on the deck plate shown in FIG. 1, and (b) It is a sectional view showing a state in which another deck plate is placed on the conventional deck plate. .

Preferred embodiments of the present invention will be described with reference to the drawings. Note that the embodiment shown below is just one example, and various forms can be taken within the scope of the present invention.

<Deck plate configuration>
The structure of the deck plate according to this embodiment will be explained using FIGS. 1 and 2. The deck plate 1 is used as a formwork for concrete poured when constructing a floor structure (or ceiling structure) of a building structure. The deck plate 1 is installed, for example, so as to span between a plurality of beams.

The deck plate 1 is formed from a thin steel plate that has been plated with zinc or other plating, or from a black steel material that has not been surface-treated. The deck plate 1 is manufactured, for example, by roll-forming a flat steel plate with a roll-forming machine. The deck plate 1 is bent at a plurality of locations by the roll-forming machine. Here, the thickness of the deck plate 1 is preferably 0.5 to 2.3 mm. In this embodiment, the thickness of the deck plate 1 is 0.8 mm.
As shown in FIGS. 1 and 2 , the deck plate 1 has a rib 10 , a surface portion 20 , and an end closed portion 30 .

(rib)
The rib 10 is formed by bending a steel plate, and is formed so as to protrude from one surface side (downward) of the surface portion 20 . As shown in FIG. 2, the rib 10 includes a curved portion 11 bent toward one side (downward) of the steel plate, and a straight line continuous with the curved portion 11 and extending in a direction perpendicular to the surface portion 20. a folded part 13 that is continuous with the straight part 12 and is curved and folded back a plurality of times; a straight part 14 that is continuous with the folded part 13 and whose surface direction extends along the straight part 12; It has a curved part 15 that is continuous with the straight part 14 and is bent toward the surface part 20.
The curved portion 11 and the curved portion 15 are formed so that their bending radius R is approximately 6 mm. With this configuration, bending by roll forming is relatively easy, and it is possible to prevent waste of concrete due to the recess formed between the curved parts 11 and 15 becoming larger than necessary. can do.
The linear portion 12 and the linear portion 14 are formed so that their surfaces are in contact with each other, and the effect of being connected by caulking or the like is improved, for example. This makes it difficult for the straight portions 12 and 14 to separate.
The folded portion 13 is formed in a substantially triangular shape when viewed in cross section, and is folded back so that the straight portion 12 and the straight portion 14 are in contact with each other, and the starting point and the ending point are adjacent to each other.

In the rib 10 on one end side, the curved portions 11 and 15 are formed so that the bending radius R is about 6 mm. This is because bending by roll forming is relatively easy and because it prevents the recess formed between the curved portions 11 and 15 from becoming unnecessarily large, thereby causing concrete waste.
The straight portion 12 and the straight portion 14 are formed so that their surfaces abut against each other, and are connected by crimping or the like, so that the straight portion 12 and the straight portion 14 do not separate from each other.
The folded portion 13 is formed in a generally triangular shape in cross section, and is folded back so that the start point and the end point are adjacent to each other and the straight portion 12 and the straight portion 14 abut against each other.

(face part)
The surface portion 20 is mainly a portion of the deck plate 1 where the ribs 10 are not formed, and is a portion that receives the load of concrete to be placed. A plurality of surface portions 20 are arranged in the width direction W of the deck plate 1 (hereinafter simply referred to as “width direction W”) with the ribs 10 interposed therebetween. That is, the ribs 10 and the surface portions 20 are alternately formed in the width direction W of the deck plate 1. Each surface portion 20 is formed into a substantially rectangular shape and arranged on the same plane.

Moreover, the surface portion 20 has a plurality of protrusions 21 formed along the longitudinal direction L of the deck plate 1 (hereinafter simply referred to as “longitudinal direction L”). The protruding portion 21 is formed by bending a steel plate. The protruding portion 21 is formed on the surface portion 20 so as to protrude toward the side (downward) where the rib 10 is formed. The protruding portion 21 may protrude toward the opposite side (upward) from the side where the rib 10 is formed. As shown in FIG. 2, the surface portion 20 is thus configured by forming protrusions 21 and flat portions 22 alternately.
Three protrusions 21 are formed on the surface portion 20 located between the plurality of ribs 10. The number of protrusions 21 formed on one surface is not limited to three.

The surface portion 20 also has a plurality of bulges 23 formed on the flat portion 22 along the width direction W. As shown in FIG. 1, the bulges 23 are formed at intervals in the longitudinal direction L. The bulges 23 are also divided in the width direction by protrusions 21 formed along the longitudinal direction L. In the deck plate 1 of this embodiment, the deck plate 1 is processed so that the protrusions 21 are formed after the bulges 23 are formed. Therefore, when the protrusions 21 are formed, a portion of the bulges 23 is crushed, and the bulges 23 are divided in the width direction. However, this is not limited to such a configuration, and the present invention can also be applied to a configuration in which the bulges 23 are formed in the area of the protrusions 21.

The bulging portion 23 is formed along a direction (width direction W) substantially perpendicular to the extending direction (longitudinal direction L) of the protrusion portion 21 . In this way, by forming the protrusion 21 to be substantially perpendicular to the protrusion 21, the cross-sectional performance of the deck plate in the width direction W can be improved.
Further, the bulging portion 23 is formed to protrude toward one surface side (upper side) of the flat portion 22, that is, the side opposite to the protruding side (lower side) of the protrusion portion 21. In the case of a configuration without the bulge 23, the neutral axis position of the deck plate is shifted toward the rib 10 side due to the formation of the protrusion 21 that protrudes downward. By protruding toward the side opposite to the protruding side of the portion 21, a deck plate with a well-balanced neutral axis position can be realized. The bulging portion 23 may protrude toward the protruding side (downward) of the protruding portion 21 .
Further, the bulging portion 23 has a protruding height that is approximately the same as the protruding height of the protruding portion 21 . As will be described later, when another deck plate 100 is placed on the end of the deck plate 1, the protrusion 121 of the other deck plate 100 comes into contact with the surface portion 20 (flat portion 22) of the deck plate 1. If they come into contact with each other, the leading end side of the other deck plate 100 will be lifted up and not placed on the deck plate 1. Since the bulging portion 23 has a protruding height that is substantially the same as the protruding height of the protruding ridge portion 21, the tip side of the deck plate 100 comes into contact with the bulging portion 23, so that the above-described lifting can be suppressed. The height of the bulging portion 23 may be higher or lower than the protruding height of the protruding portion 21 .

(end close part)
As shown in FIG. 1, the end close portions 30 are formed at both ends of the deck plate 1 in the longitudinal direction L. As shown in FIG. The end closed portion 30 is formed by crushing both ends of the rib 10 at right angles to the surface of the deck plate 1. Thereby, the rib 10 is formed in a cross section in which the end close portions 30 at both ends are crushed, and the other portion sandwiched between the end close portions 30 is formed in a substantially triangular shape in cross section. With this configuration, both ends of the rib 10 are formed in a flat shape, so that they can be placed on the upper surface of the flange portion of the beam. The end close portion 30 is formed such that the length along the extending direction of the rib 10 is longer than the length placed on the upper surface of the flange portion of the beam.

An example of construction of the deck plate according to this embodiment will be described with reference to FIG. 2. Below, a construction example in which another deck plate 100 is placed on the end of the deck plate 1 will be described. As shown in FIG. 2, the other deck plate 100 has a protrusion 121 formed downward in the surface portion 120 on one end side in the width direction W among the surface portions 120 provided between the plurality of ribs 110. A flat mounting portion 122 is formed at the end of the surface portion 120 (on the edge side of the protrusion portion 21). Note that the protrusion height of the bulging portion 23 of the deck plate 1 is set to be approximately equal to the protrusion height of the protrusion portion 121 of the other deck plate 100.

As shown in FIG. 2(a), the surface portion 120 on one end side of the other deck plate 100 is arranged above the surface portion 20 located on the one end side of the deck plate 1, and the protrusion portion 121 of the other deck plate 100 It comes into contact with the surface portion 20 of the deck plate 1. At this time, the mounting portion 122 located on the tip side of the other deck plate 100 comes into contact with the bulge portion 23 of the deck plate 1. In this way, since the protruding height of the bulging part 23 of the deck plate 1 is set to be approximately equal to the protruding height of the protruding part 121 of the other deck plate 100, the end of the deck plate 1 and the other deck plate 100 is The protrusions 121 of the other deck plate 100 come into contact with the surface part 20 of the deck plate 1 while the parts are kept substantially parallel to each other, and the mounting part 122 of the other deck plate 100 supports the expansion of the deck plate 1. It comes into contact with the protrusion 23 .

On the other hand, as shown in FIG. 2(b), when another deck plate 100 is placed on the deck plate 1A in which the bulge is not formed, the surface portion 20A (multiple The surface portion 120 on the one end side of the other deck plate 100 is arranged above the surface portion 20A on the one end side in the width direction W of the surface portion 20A provided between the ribs 10A, and the protrusion 121 of the other deck plate 100 It comes into contact with the surface portion 20A of the deck plate 1. At this time, the mounting portion 122 located on the tip side of the other deck plate 100 does not come into contact with the surface portion 20A of the deck plate 1A, and is in a floating state.

In this way, when another deck plate 100 is placed on the deck plate 1A in which no bulging portion is formed, the placing portion on the tip side of the other deck plate 100 lifts up, causing the deck plates to overlap each other. In order to avoid a situation where the joint is not stable, only the flat plate part of the mounting part 122 of the other deck plate 100 is placed so that the protrusion part 121 of the other deck plate 100 does not hang on the deck plate 1A. This results in restrictions on the range in which the deck plate can fit in the width direction. On the other hand, since the deck plate 1 has the bulging part 23, the protrusion part 121 of the other deck plate 100 comes into contact with the surface part 20 of the deck plate 1, and the mounting part 122 of the other deck plate 100 is placed on the deck plate 1. The end of the other deck plate 100 is placed on the deck plate 1 while being in contact with the bulge 23 of the deck plate 1. As a result, the above-mentioned lifting does not occur at the joints between the deck plates, so a stable joint state can be obtained, and there are no restrictions on the range in which the deck plates can fit in the width direction compared to a configuration without the bulge 23. .

Note that in this embodiment, a configuration in which the protruding height of the protruding portion 23 of the deck plate 1 is set to be approximately equal to the protruding height of the protruding portion 121 of the other deck plate 100 has been exemplified, but the present invention is not limited to this. It is not limited to. The present invention can also be applied to a structure in which the height of the bulge 23 is different from the height of the ridge 121, such as the height of the bulge 23 being set lower than the height of the ridge 121. .

<Evaluation of cross-sectional performance of deck plate>
Hereinafter, evaluation of the cross-sectional performance of the deck plate according to the present embodiment will be described. Below, an evaluation example comparing the cross-sectional performance of a deck plate having a bulge with that of a deck plate without a bulge will be described.

First, the structure of the deck plate having the bulge will be explained. A bulge having a height of 1 mm, a total length of 150 mm (length in the width direction W), and a depth of 15 mm (length in the longitudinal direction L) is formed on the deck plate with a thickness of 0.8 mm. There is. Note that although a portion of the bulge is divided by the protrusion, the total length here corresponds to the length between both ends of one surface section assuming that the bulge is not divided. Further, the bulges are formed at intervals (pitch) of 50 mm in the longitudinal direction L.
On the other hand, a deck plate to be compared has the same dimensions as the deck plate described above, but does not have a bulge.

Regarding the deck plate having the above configuration, the section modulus, moment of inertia of area, and displacement after uniformly distributed load were evaluated as cross-sectional properties. The evaluation was performed using general-purpose structural analysis software (midas) by analyzing the deflection of the flat plate portion (face portion) when the deck plate was subjected to a uniformly distributed load. Note that the uniformly distributed load applied was a load (5000 N/m ² ) corresponding to a slab thickness of about 150 mm. The results of the above evaluation are shown in Table 1.

As shown in Table 1, the deflection of a deck plate without a bulge (displacement difference between the rib apex and the center of the flat plate) is greater than the deflection of a deck plate with a bulge (displacement difference between the rib apex and the center of the flat plate). The result was that the size was also about 1.8 times larger. By applying the deck plate having the bulge in this way, the result was that the deflection in the width direction W of the deck plate was significantly suppressed.

According to the deck plate according to the above embodiment, in the configuration in which the flat plate-like surface portions and the ribs are formed in succession in the width direction alternately, the surface portion includes a flat portion and a longitudinal direction from one surface side of the flat portion. , and a plurality of bulges formed to protrude from one side of the flat part in the width direction. By having such a configuration, it is possible to improve the cross-sectional performance of the deck plate in the longitudinal direction by forming the protrusions, while suppressing deflection in the width direction by forming the bulges.

The present invention is not limited to the configuration according to the above embodiment. The configuration of the bulge described in the above embodiment is merely an example, and the shape, arrangement, dimensions, etc. of the bulge can be changed as appropriate depending on the size of the deck plate, etc.

1... deck plate, 10... rib, 20... surface portion, 21... protrusion portion, 22... flat portion, 23... bulge portion

Claims (3)

A deck plate in which flat plate-like surfaces and ribs are alternately and continuously formed in the width direction,
The surface portion includes a flat portion, a protruding ridge portion formed to protrude along the longitudinal direction from one side of the flat portion, and a protruding ridge portion formed to protrude along the width direction from one side of the flat portion, and the protruding ridge portion is formed to protrude from one side of the flat portion along the width direction. a plurality of bulges formed in a direction substantially perpendicular to the extending direction of the part ;
The deck plate is characterized in that the bulging portion protrudes from a surface of the flat portion opposite to the direction in which the protruding portion protrudes. The deck plate according to claim 1, wherein a plurality of the bulges are formed at intervals in the longitudinal direction. 3. The deck plate according to claim 1, wherein the bulging portion has a protruding height that is approximately the same as the protruding height of the protruding ridge portion.

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