Deck plates and deck composite slabs for deck composite slabs

Abstract

To improve fire resistance performance on a deck composite slab by accelerating separation of the deck plate from a concrete part in fire while securing combination between the deck plate and the concrete part.SOLUTION: A deck plate 10 for a wave-shaped deck composite slab 1 is formed by ranging a plurality of crest parts 11 and valley bottom parts 13 continued to each other via inclination parts 15 inclined alternately, and comprises engaging parts 20 and 30 provided for engaging with a concrete part at the deck composite slab 1 and deformation acceleration parts 40 to accelerate separation from the concrete part in heat expansion. The deformation acceleration parts 40 are deformed to form gaps S between the deck plate and the concrete part in heat expansion.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a deck plate for a deck composite slab and a deck composite slab.

Background Art

[0002] The floors of large-scale buildings such as high-rise buildings are constructed with deck composite slabs formed by concrete (concrete part) and deck plates. As the deck plate used in the deck composite slab, for example, a corrugated deck plate is known in which inclined portions inclined alternately in different directions and a plurality of peak portions and valley bottom portions continuous with each other via the inclined portions are connected. In such a deck plate, as a structure for promoting the synthesis (engagement) with concrete, a key portion (engagement portion) capable of engaging with concrete is formed (see, for example, Patent Document 1).

[0003] The deck composite slab is formed by integrating the deck plate and concrete by the engagement portion provided on the deck plate. Thereby, as a reasonable composite structure in which the deck plate bears the tensile force and the concrete bears the compressive force, it supports the constant load acting on the floor.

[0004] On the other hand, it is known that the strength of the deck plate that bears the tensile force in the deck composite slab during a fire is lost by heat at the initial stage of the fire, and the deck plate no longer functions as a structure in the deck composite slab. In addition, since the deck composite slab may collapse at the fulcrum position, which is the joint between the beam and the deck composite slab during a fire, etc., a deck composite slab that reinforces the fulcrum position (joint position) to improve the allowable performance such as the load capacity and span and the fire resistance is known (see, for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] During a fire, heat is transmitted to the concrete through the deck plate. However, concrete is constructed by solidifying through the hydration reaction of cement and water, and a large amount of the water used in the hydration reaction remains inside the concrete. Therefore, even when the concrete is heated by a fire, it has the property that its temperature hardly rises due to the internal water, and it has been found that the rate of temperature rise of the concrete is slower than the rate of temperature rise of the deck plate.

[0007] FIG. 9 is a conceptual diagram for explaining the forces acting on the conventional deck composite slab 100 during a fire. For example, the deck composite slab 100 based on Patent Document 2 is fixed to the support beam B, and the deck plate 200 is also indirectly constrained by the support beam B. Due to heating during a fire, an expansion force P1 that causes the deck plate 200 to rapidly expand and elongate acts on the deck plate 200. However, the deck plate 200 is constrained by the support beam B at both of its ends, and a restraining force P2 that restrains the elongation of the deck plate 200 in the horizontal direction acts on the deck plate 200. Therefore, on the heated deck plate 200, a force that opposes the expansion force and the restraining force is generated, and a force P3 that attempts to deform the deck composite slab vertically downward acts.

[0008] In the deck composite slab 100, the deck plate 200 is enhanced for composite with the concrete 300 via the engagement portion. During a fire, the deck composite slab 100 loses its structural function early. Nevertheless, during a fire, a force P3 that pulls the concrete 300 downward in the vertical direction acts on the deck plate 200 as it deforms. That is, in addition to supporting the vertical load assumed by the deck composite slab, the downward vertical force P3 due to the thermal expansion of the deck plate 200 may exert an extra effect on the deck composite slab 100. This is considered to be one cause of the reduction in the fire resistance performance of the deck composite slab 100, and there is a need for countermeasures.

[0009] Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a technique for improving the fire resistance performance of a deck composite slab by promoting the peeling of the deck plate from the concrete portion during a fire while ensuring the composite of the deck plate and the concrete portion.

Means for Solving the Problems

[0010] In order to solve the above problems, a deck plate for a deck composite slab according to the present invention is a deck plate for a corrugated deck composite slab in which a plurality of peak portions and valley bottom portions that are continuous with each other are connected via alternately inclined inclined portions, and includes an engagement portion used for engagement with the concrete portion in the deck composite slab, and a deformation promoting portion that promotes peeling from the concrete portion during thermal expansion, and the deformation promoting portion is characterized in that it deforms so that a gap is formed between it and the concrete portion during thermal expansion.

[0011] Further, in the deck plate for a deck composite slab according to one aspect of the present invention, the engagement portion includes a groove formed at a transition portion between the inclined portion and the valley bottom portion, and the deformation promoting portion is provided at a predetermined interval along the extending direction of the groove, and may be an overhanging portion formed to project from the side of the groove toward the side of the valley bottom portion so as to partially interrupt the extension of the groove.

[0012] Further, in the deck plate for a deck composite slab according to one aspect of the present invention, the overhanging portion may have a pair of inclined surfaces extending in a direction in which surfaces facing in the extending direction of the groove intersect each other, and an intervening surface extending along the extending direction of the groove between the pair of inclined surfaces.

[0013] Further, in the deck plate for a deck composite slab according to one aspect of the present invention, the engaging portion includes a groove formed at a transition portion between the inclined portion and the bottom portion of the valley, and the deformation promoting portion is provided at a predetermined interval along the extending direction of the groove, and may be a thermoplastic filling member provided in the groove so as to partially interrupt the extension of the groove.

[0014] Further, in the deck plate for a deck composite slab according to one aspect of the present invention, the filling member may have a tip portion that protrudes from the groove toward the bottom portion of the valley and engages with the concrete portion.

[0015] Further, in the deck plate for a deck composite slab according to one aspect of the present invention, the filling member may be formed to taper from the side of the groove toward the side of the tip portion.

[0016] Further, in the deck plate for a deck composite slab according to one aspect of the present invention, the engaging portion includes a convex portion that protrudes toward the bottom portion of the valley in the inclined portion, and a plurality of the convex portions are provided at a predetermined interval along the extending direction of the inclined portion, and the filling member may be provided between at least some of the convex portions.

[0017] Furthermore, in order to solve the above problems, the deck composite slab according to the present invention includes a concrete part, and a plurality of peak parts and valley parts that are continuous with each other through alternately inclined inclined parts, and a corrugated deck plate that engages with the concrete part. The deck plate has an engaging part that is used for engaging with the concrete part in the deck composite slab, and a deformation promoting part that promotes peeling from the concrete part during thermal expansion. The deformation promoting part is characterized in that it deforms so that a gap is formed between it and the concrete part during thermal expansion.

Advantages of the Invention

[0018] According to the present invention, while ensuring the synthesis of the deck plate and the concrete part, the peeling of the deck plate from the concrete part during a fire is promoted, and the fire resistance performance of the deck composite slab is improved.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 4

Figure 5

Figure 6A

Figure 6B

Figure 7

Figure 8A

Figure 8B

Figure 9

Embodiments for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that in the following description, the drawings are schematic, and it is necessary to pay attention to the fact that the dimensional relationships of each element, the ratios of each element, etc. may be different from the actual situation. There may also be parts where the dimensional relationships and ratios are different between the drawings.

[0021] <First Embodiment> [Deck Composite Slab] FIG. 1 is a perspective view for explaining the configuration of a deck composite slab 1 according to the first embodiment. The deck composite slab 1 according to the first embodiment is, for example, a composite structure composed of a steel deck plate 10 and a concrete part 60, and is used for the ceiling or floor of a building such as a steel frame structure. In the deck composite slab 1, the deck plate 10 resists tensile force, and the concrete part 60 resists compressive force. Thereby, the deck composite slab 1 can withstand a large load and be spanned between support beams B of H-shaped steel over a long span. In this embodiment, a plurality of headed studs Sd are provided on the flange of the support beam B along the extending direction of the flange, but it is not limited to the headed studs Sd, and plug welding or the like may be performed.

[0022] Hereinafter, the direction in which the deck plate 10 is spanned between the support beams B of the building is defined as the longitudinal direction (length direction) L of the deck plate 10, the direction in which the deck plate 10 extends intersecting the longitudinal direction L is defined as the lateral direction (width direction) W, and the direction in which the deck plate 10 is placed on the support beam B is defined as the height direction H of the deck plate 10.

[0023] (Deck Plate) FIG. 2 is a perspective view of the deck plate 10 used for the deck composite slab 1 according to the first embodiment. The deck plate 10 in the first embodiment is a deck plate 10 for a corrugated deck composite slab 1 in which a plurality of peak portions 11 and valley bottom portions 13 that are continuous with each other are connected via inclined portions 15 that are inclined alternately in different directions, and includes engaging portions 20 and 30 provided for engagement with the concrete portion 60 in the deck composite slab 1, and a deformation promoting portion 40 that promotes peeling from the concrete portion 60 during thermal expansion. The deformation promoting portion 40 is characterized in that it deforms (including deformation, transformation, melting, etc.) so that a gap S is formed between it and the concrete portion 60 during thermal expansion. The configuration of the deck plate 10 in the first embodiment will be specifically described below.

[0024] The deck plate 10 is a corrugated steel plate formed by roll-forming a thin steel plate subjected to a surface treatment such as zinc plating. Note that the deck plate 10 may not be subjected to a surface treatment such as plating. The deck plate 10 has a peak portion 11, a valley bottom portion 13, an inclined portion 15, engaging portions 20 and 30, and a deformation promoting portion 40. The deck plate 10 has a corrugated shape in which the peak portion 11 and the valley bottom portion 13 extending in the longitudinal direction L are continuous with each other in the lateral direction W via the inclined portion 15.

[0025] The deck plate 10, when considered as a single plate, consists of two peak portions 11, one valley bottom portion 13, and two pairs of inclined portions 15, and is formed in a corrugated shape in a cross-section along the short direction W. Depending on the dimension of the deck plate 120 in the short direction W, only one peak portion 121 may be provided on one deck plate 120. Further, when one deck plate 10 is connected to another deck plate 10 in the short direction W, the connecting portion between the deck plates 10 functions as the valley bottom portion 13. Also, the deck plate 10 may be subjected to end closure processing at both ends in the longitudinal direction L.

[0026] The peak portion 11 is a flat portion formed on the upper side with respect to the support beam B in a state where the deck plate 10 is bridged between the support beams B (hereinafter, also referred to as "bridged state"), and is a plate-like portion extending in the longitudinal direction L. The peak portion 11 has a groove 12. The groove 12 is formed to be recessed toward the valley bottom portion 13 side. The groove 12 extends in the longitudinal direction L, and when there is one groove 12, it is provided near the center in the short direction W.

[0027] The strength of the peak portion 11 is improved by the groove 12 in the peak portion 11. The groove 12 is not limited to being formed singly in the peak portion 11, and a plurality of grooves 12 may be formed. Note that the groove 12 may not be formed.

[0028] The valley bottom portion 13 is parallel or substantially parallel to the peak portion 11, and is a flat portion placed on the support beam B in the bridged state. The valley bottom portion 13 is a plate-like portion extending in the longitudinal direction L. The valley bottom portion 13 does not overlap the peak portion 11 in the short direction W. Note that the groove 12 formed in the peak portion 11 may be formed in the valley bottom portion 13.

[0029] The inclined portion 15 is a portion connecting the peak portion 11 and the valley bottom portion 13, and is a plate-like portion extending in the longitudinal direction L. The inclined portion 15 obliquely extends from both ends of one peak portion 11 toward the valley bottom portion 13 in the short side direction W. The inclined portion 15 is inclined so as to form a predetermined angle, for example, an obtuse angle, with respect to the peak portion 11 and the valley bottom portion 13. Note that the groove 12 formed in the peak portion 11 may be formed in the inclined portion 15.

[0030] The engaging portion 20 is provided on the inclined portion 15. The engaging portion 20 includes an engaging convex portion 21 and an engaging concave portion 22. The engaging convex portion 21 is a convex portion formed to protrude from the surface of the adjacent inclined portion 15 via one peak portion 11 to the opposite sides (the side of the valley bottom portion 13), for example, by embossing. A plurality of engaging convex portions 21 are provided at predetermined intervals along the extending direction (longitudinal direction L) of the inclined portion 15. The engaging concave portion 22 is located between the engaging convex portions 21 along the longitudinal direction L. The engaging convex portion 21 and the engaging concave portion 22 increase the strength of the inclined portion 150 and promote the engagement between the concrete portion 60 and the deck plate 10 described later, enhancing the combined effect.

[0031] A bulging portion 14 is formed at the transition portion between the valley bottom portion 13 and the inclined portion 15. The bulging portion 14 is a portion protruding to the opposite sides in the pair of inclined portions 15 at one peak portion 11. That is, the bulging portions 14 in the pair of inclined portions 15 facing each other across the valley bottom portion 13 are formed to face each other and bulge in the direction approaching each other. The bulging portion 14 is located on the side of the valley bottom portion 13 with respect to the engaging convex portion 20.

[0032] The engaging portion 30 is formed as an engaging groove (dovetail groove) extending along the longitudinal direction L between the bulging portion 14 and the valley bottom portion 13 (hereinafter also referred to as "engaging groove 30"). The cross-section along the short-side direction W of the engaging groove 30 is formed to be curved. The engaging groove 30 is formed in a direction approaching each other at a pair of inclined portions 15 at one peak portion 11. That is, in a pair of inclined portions 15 continuous with the valley bottom portion 13 of the deck plate 10, the engaging groove 30 is formed to face each other and is curved in a direction away from each other. The engaging groove 30 promotes the engagement between the concrete portion 60 and the deck plate 10 described later and enhances the synthetic effect.

[0033] A plurality of deformation promoting portions 40 are provided at predetermined intervals along the extending direction (longitudinal direction L) of the engaging groove 30 so as to partially interrupt the extension of the engaging groove 30. The deformation promoting portion 40 is an overhanging portion (hereinafter also referred to as "deformation overhanging portion 40") formed to project from the side of the engaging groove 30 toward the side of the valley bottom portion 13. The deformation overhanging portion 40 is a portion where deformation is actively promoted, for example, when the deck composite slab 1 is heated during a fire and the deck plate 10 is deformed due to thermal expansion.

[0034] FIG. 3A is an enlarged view showing an enlarged portion of the engaging groove 30 of the deck plate 10 shown in FIG. 2. FIG. 3B is a cross-sectional view of the deck plate 10 taken along line B-B in FIG. 3A. The deformation overhanging portion 40 is formed on the side facing the valley bottom portion 13 so as to extrude the deck plate 10 in each engaging groove 30, for example, by embossing. That is, the deformation overhanging portion 40 projects in the short-side direction W from each engaging groove 30 formed in the inclined portion 15 continuous with one peak portion 11 toward the continuous valley bottom portion 13. The extension of each engaging groove 30 in the longitudinal direction L is interrupted by the deformation overhanging portion 40, and the engaging groove 30 is divided into a plurality of concavities and convexities continuous in the short-side direction W in a concave and convex shape. Thereby, while ensuring the normal engagement between the deck plate 10 and the concrete portion 60 in the divided engaging groove 30, it is possible to secure a portion that promotes the disengagement between the deck plate 10 and the concrete portion 60 when the deck plate 10 is heated.

[0035] The deformed protruding portion 40 has a pair of inclined surfaces 41 and a protruding surface (intervening surface) 42. The pair of inclined surfaces 41 are surfaces facing the extending direction (longitudinal direction L) of the engaging groove 30, and extend in a direction intersecting each other toward the adjacent valley bottom portion 13. The pair of inclined surfaces 41 extend from the surface or portion defining the engaging groove 30 facing the short side direction W along the longitudinal direction L toward the valley bottom portion 13 adjacent to the engaging groove 30, that is, so as to approach each other in the short side direction W.

[0036] The protruding surface 42 is continuous with the inclined surface 41 on the side opposite to the portion of the inclined surface 41 continuous with the surface or portion defining the engaging groove 30 facing the short side direction W. The protruding surface 42 extends between the pair of inclined surfaces 41 along the extending direction (longitudinal direction L) of the engaging groove 30. The protruding surfaces 42 in the engaging grooves 30 facing each other across the valley bottom portion 13 may be formed at the same position or at displaced positions in the longitudinal direction L.

[0037] (Concrete portion) The concrete portion 60 is formed by solidifying the concrete placed on the deck plate 10. Inside the concrete portion 60, for example, reinforcing bars (not shown) for preventing cracks or the like, welded wire meshes 61 (see FIG. 1) or the like may be embedded.

[0038] [Characteristics of the deck composite slab] According to the above deck composite slab 1, the improvement of fire resistance can be defined. The deck composite slab 1 assumes, for example, that it collapses at the fulcrum position which is the joint portion with the support beam B during a fire, and reinforces the fulcrum position (joint position) to improve the allowable performance such as the load capacity and span, and the fire resistance performance. A plurality of studs Sd provided on the flange of the support beam B are provided as reinforcing means. The studs Sd are arranged side by side in the short side direction W on the support beam B. In addition, along the row of the studs Sd, further arranging reinforcing bars (not shown) or elongated steel plates (not shown) along them further improves the performance of the deck composite slab 1.

[0039] By such reinforcement means, the end drawing resistance in the deck composite slab 1 is improved, the fixing degree to the support beam B is improved, the prevention of cracking and the expansion of cracks at the end of the deck composite slab 1 can be suppressed, and the allowable performance such as the loading capacity and span can be enhanced. Thereby, the stress generated around the stud Sd is dispersed, and the end of the deck composite slab 1 can be reinforced, so that the fire resistance performance can be improved.

[0040] In the deck composite slab 1 during a fire, the deck plate 10 is first heated by the flame that burns the ceiling from below, and then the concrete part 60 is heated. Since the concrete part 60 contains a large amount of moisture inside, it has the characteristic that the temperature is difficult to rise even when heated during a fire. Therefore, there is a large difference between the temperature rise rate in the deck plate 10 and the temperature rise rate in the concrete part 60.

[0041] For example, the thermal expansion coefficients of the deck plate 10 and the concrete part 60, which are steel materials in the deck composite slab 1, are about 11.0×10 -6 ℃ (expansion and contraction of 0.1 mm with a temperature change of 10 K per 1 m of unit length) and are the same. However, there is a significant difference in the temperature rise rate between the deck plate 10 and the concrete part 60 depending on the fire situation, etc. In the deck plate 10 of the deck composite slab 1, the elongation due to thermal expansion is significant compared to the thermal expansion of the concrete part 60 in the initial stage of the fire.

[0042] Here, the deformation of the deck plate 10 will be described with reference to FIG. 4. FIG. 4 is a cross-sectional view of the deck composite slab taken along the longitudinal direction L in the engaging groove 30. When the deck plate 10 is heated by the flame due to the fire, the deck plate 10 tends to deform so as to elongate due to thermal expansion. However, since the deck plate 10 is fixed to the support beam B at the end in the longitudinal direction L, a force that contracts in the longitudinal direction L acts on the deck plate 10.

[0043] The deck plate 10 is easily deformed by the deformation overhang portion 40. The forces acting on the pair of inclined surfaces 41 collide at the overhanging surface 42. The forces generated inside the deck plate 10 lose their escape path, and at each deformation overhang portion 40, the deck plate 10 deforms or buckles so as to bulge toward the side opposite to the concrete portion 60 (arrow P4). As a result, the engagement (constraint) between the deck plate 10 and the concrete portion 60 is partially released, and a gap S is formed. By releasing the engagement between the deck plate 10 and the concrete portion 60, the deck plate 10 is suppressed from pulling the concrete portion 60, and adverse effects on the entire deck composite slab 1 caused by the deck plate 10 can be eliminated.

[0044] FIG. 5 is a diagram schematically showing the state after the engagement between the deck plate 10 and the concrete portion 60 is released. Since the deck plate 10 in the first embodiment is provided with the deformation overhang portion 40 for the purpose of intentionally promoting its deformation, a gap S is formed between the deck plate 10 and the concrete portion 60 when heated by a fire. In particular, a gap (air layer) S is formed between the deck plate 10 and the concrete portion 60 along the longitudinal direction L, and an air layer S is provided between the deck plate 10 and the concrete portion 60. That is, since the deck plate 10 actively deforms during a fire, an air layer S having an additional heat insulation effect is formed between the deck plate 10 and the concrete portion 60, and the fire resistance performance of the deck composite slab 1 can be further improved.

[0045] <Modification> FIG. 6A is a perspective view showing a partial enlargement of the deck plate 10A for explaining the deformation promoting portion 50 according to the modification. FIG. 6B is a cross-sectional view of the deck plate 10A taken along line B-B in FIG. 6A. For the same components as those of the above-described deck plate 10, the same reference numerals are given and the description thereof is omitted. The deck plate 10A is different from the deck plate 10 in the deformation overhang portion 40.

[0046] In the first embodiment, the deformation promoting portion 40 was formed so as to project from the engagement groove 30 in the short-side direction W. In contrast, the deformation promoting portion 50 according to the modification example is formed such that the surface facing the peak portion 11 of the engagement groove 30 bulges in the height direction H toward the peak portion 11 (hereinafter, also referred to as "deformation ridge portion 50").

[0047] The deformation ridge portion 50 is formed on the side facing the peak portion 11 so as to push out the deck plate 10 in each engagement groove 30 by, for example, embossing. That is, the deformation ridge portion 50 is formed to bulge in the height direction H in each engagement groove 30 formed in the inclined portion 15 continuous with one peak portion 11. The extension of each engagement groove 30 in the longitudinal direction L is interrupted by the deformation ridge portion 50, and the engagement groove 30 is divided in a concave shape in the short-side direction W and in a convex shape in the height direction H so that the unevenness is continuous.

[0048] The deformation ridge portion 50 has a pair of inclined surfaces 51 and a top upper surface (intervening surface) 52. The pair of inclined surfaces 51 are surfaces facing the extending direction (longitudinal direction L) of the engagement groove 30 and extend in directions intersecting each other. The pair of inclined surfaces 51 extend from the surface or portion of the engagement groove 30 facing the top upper surface 52 along the longitudinal direction L so as to approach each other toward the side of the top upper surface 52.

[0049] The top upper surface 52 is continuous with the inclined surface 51 on the side opposite to the portion of the inclined surface 51 continuous with the surface or portion of the engagement groove 30 facing the top upper surface 52. The top upper surface 52 extends along the extending direction (longitudinal direction L) of the engagement groove 30 between the pair of inclined surfaces 51. The top upper surface 52 preferably contacts the bulging portion 14, but may not contact if the gap between the top upper surface 52 and the bulging portion 14 is small. The deformation ridge portion 50 may be formed at the same position in the longitudinal direction L in the engagement grooves 30 facing each other with the valley bottom portion 13 interposed therebetween, or may be formed at a displaced position.

[0050] The deck plate 10A is easily deformed by the deformation raised portions 50. The forces acting on the pair of inclined surfaces 51 collide at the top upper surface 52. The forces generated inside the deck plate 10A lose the escape space, and at each deformation raised portion 50, the deck plate 10A deforms or buckles so as to bulge on the side opposite to the peak portion 11. As a result, the engagement (constraint) between the deck plate 10A and the concrete portion 60 is partially released. By releasing the engagement between the deck plate 10A and the concrete portion 60, it is possible to suppress the deck plate 10A from pulling the concrete portion 60 downward in the vertical direction, and it is possible to eliminate the adverse influence on the entire deck composite slab 1 caused by the deck plate 10A.

[0051] <Second Embodiment> Next, the deck composite slab 8 according to the second embodiment will be described with reference to FIG. 7. FIG. 7 is an enlarged view showing an enlarged part of the deck plate 10B in the second embodiment. For the same configuration as the deck composite slab 1 according to the first embodiment, the same reference numerals are given and the description is omitted. The deck composite slab 8 according to the second embodiment is, for example, a composite structure composed of a steel deck plate 10B and a concrete portion 60, and is used for the ceiling or floor of a reinforced concrete building. The deck plate 10B has a peak portion 11, a valley bottom portion 13, an inclined portion 15, engagement portions 20 and 30, and deformation promoting portions 71 and 72.

[0052] A plurality of deformation promoting portions 71 are provided at predetermined intervals along the extending direction (longitudinal direction L) of the engagement groove 30 so as to partially interrupt the extension of the engagement groove 30. In the present embodiment, the deformation promoting portion 71 is a filling member (hereinafter, also referred to as "deformation filling member 71") formed of a thermoplastic resin or the like. However, for example, as long as it is a filling member formed of a metal or an alloy having a melting point lower than that of the deck plate 10B, the material is not particularly limited. The deformation filling member 71 is, for example, a portion where melting (deformation) is actively promoted before the deck composite slab 8 is heated and the deck plate 10B is deformed by thermal expansion during a fire.

[0053] The deformation promoting part 72 is provided in the engaging concave part 22 of the engaging part 20. In the present embodiment, the deformation promoting part 72 is a filling member (hereinafter, also referred to as "deformation filling member 72") formed of a thermoplastic resin or the like. However, for example, as long as it is a filling member formed of a metal or an alloy having a melting point lower than that of the deck plate 10B, the material is not particularly limited. Specifically, the deformation filling member 72 is provided in the engaging concave part 22 between the two engaging convex parts 21 so as not to be continuous in the longitudinal direction L. Thereby, while partially securing the normal engagement between the deck plate 10B and the concrete part 60 at the engaging part 20, it is possible to secure a part that promotes the disengagement of the engagement when the deck plate 10B is heated.

[0054] Furthermore, the deformation filling member 71 is provided so as to partially fill the engaging groove 30 along the longitudinal direction L. The deformation filling members 71 are provided at predetermined intervals from each other in the longitudinal direction L, and the engaging groove 30 is divided such that a plurality of concavities and convexities are continuous in the concave and convex shapes in the short direction W. That is, the part where the engaging groove 30 is concave becomes the part where the deformation filling member 71 is convex. Thereby, while securing the normal engagement between the deck plate 10B and the concrete part 60 in the divided engaging groove 30, it is possible to secure a part that promotes the disengagement of the engagement when the deck plate 10B is heated. Note that the deformation filling member 71 is accommodated in the engaging groove 30 so as not to exceed the bulging part 14 in the short direction W.

[0055] According to the deck composite slab 8 according to the second embodiment, in the initial stage of a fire, the deformation filling members 71 and 72 will melt first. As a result, the volume of the melted deformation filling members 71 and 72 will increase and try to move to the side away from the concrete part 60 so as to promote the thermal expansion of the heated deck plate 10B. Thereby, at the location where the deformation filling members 71 and 72 are provided, the deck plate 10B and the melted deformation filling members 71 and 72 can move relative to each other at the interface between them, so that the deck plate 10B can be deformed.

[0056] When the deck plate 10B deforms in a direction away from the concrete part 60, the melted deformation filling members 71 and 72 also move in a direction away from the concrete part 60 together. As a result, a gap S is generated between the deck plate 10B and the concrete part 60 in the deformation filling part 71. When the deformation filling members 71 and 72 melt, the elongation due to the thermal expansion of the deck plate 10B is promoted. Therefore, the deformation filling members 71 and 72 become the starting points for inducing the separation between the deck plate 10B and the concrete part 60 during a fire.

[0057] Note that the deformation filling member 72 in the present embodiment may be provided in the engaging concave portion 22 of the deck plate 10 in the first embodiment.

[0058] <Modification Example> FIG. 8A is a diagram for explaining a modification example of the deformation promoting part 80 in the second embodiment. FIG. 8B is a plan view schematically explaining a modification example of the deformation promoting part 80 in the second embodiment. The deformation filling member 71 in the second embodiment was formed to fit within the engaging groove 30. In contrast, the deformation filling member 81 according to the modification example is formed to protrude in the short side direction W from the engaging groove 30.

[0059] The deformation filling member 81 is a filling member formed of a thermoplastic resin or the like. However, for example, it may be a filling member formed of a metal or an alloy having a melting point lower than that of the deck plate 10B.

[0060] The deformable filling member 81 protrudes obliquely from the engaging groove 30 at the tip portion 81 toward the valley bottom portion 13 and the adjacent peak portion 11 in the short side direction W. The deformable filling member 81 is formed to taper from the side of the engaging groove 30 toward the tip portion 81 side. That is, the width of the deformable filling member 81 in the longitudinal direction L is formed to continuously decrease from the side of the engaging groove 30 toward the tip portion 82 side. The cross-sectional shape of the deformable filling member 81 in the longitudinal direction L is trapezoidal or substantially trapezoidal in the present embodiment, but may be triangular.

[0061] The deformable filling member 81 is provided so as to partially fill the engaging groove 30 along the longitudinal direction L. The deformable filling member 81 is continuously provided in the longitudinal direction L, and the engaging groove 30 is divided so that a plurality of concavities and convexities are continuous in the concave and convex shapes in the short side direction W. That is, the portion where the engaging groove 30 is concave becomes the convex portion where the deformable filling member 71 is located. Since the deformable filling member 81 is formed to taper toward the tip portion 82, a gap that widens from the side of the engaging groove 30 toward the short side direction W is generated between the adjacent deformable filling members 81.

[0062] The deformation promoting portion 83 is provided in the engaging concave portion 22 of the engaging portion 20. In the present embodiment, the deformation promoting portion 83 is a filling member formed of a thermoplastic resin (hereinafter, also referred to as "deformable filling member 72"), but for example, as long as it is a filling member formed of a metal or an alloy having a melting point lower than that of the deck plate 10B, the material is not particularly limited. Specifically, the deformable filling member 83 is provided in the engaging concave portion 22 between the two engaging convex portions 21 so as not to be continuous in the longitudinal direction L.

[0063] When the deformable filling member 81 according to the deformation example is adopted, the engagement amount between the deck plate 10B and the concrete portion 60 in the engaging groove 30 is reduced as compared with the case where the deformable filling member 71 is adopted. However, the tip portion 82 of the deformable filling member 81 protrudes in the short side direction W, and the tip portion 82 plays a role of enhancing the synthesis with the concrete portion 60.

[0064] In addition, since the volume of the portion of the deformation filling member 81 in the engagement groove 30 is larger than that of the tip portion 82, the amount of melting during heating due to a fire increases. Therefore, a larger gap (air layer) S is formed between the deck plate 10B and the concrete portion 60, and the separation between the deck plate 10B and the concrete portion 60 can be promoted.

[0065] Note that the cross-sectional shape of the deformation filling member 81 in the longitudinal direction L is not particularly limited and may be rectangular. Further, the deformation filling member 81 in the present embodiment may be provided on the deck plate 10 in the first embodiment.

[0066] <Others> As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments and includes all aspects included in the concept and scope of claims of the present invention. Further, each configuration may be appropriately and selectively combined so as to achieve at least part of the above-described problems and effects. Further, for example, the shape, material, arrangement, size, etc. of each component in the above-described embodiment can be appropriately changed according to the specific usage mode of the present invention. The deck composite slab 1, 8 according to the present invention is, for example, intended not to inhibit, that is, to promote the deformation of the deck plates 10, 10A, 10B due to heating during a fire, and the shapes of the deck plates 10, 10A, 10B and the engaging convex portions 20 and the engaging grooves 30 are not limited to the above-described embodiments.

Explanation of reference numerals

[0067] 1, 8... Deck composite slab 10, 10A, 10B... Deck plate 11... Peak portion, 13... Valley bottom portion, 15... Inclined portion 20... Engaging portion 21... Engaging convex portion 22... Engaging concave portion 30... Engaging groove (engaging portion) 40... Deformation protruding portion (deformation promoting portion) 41... Inclined surface, 42... Protruding surface (intervening surface) 50…Deformable raised portion (deformation promoting portion) 51…Inclined surface, 52…Top upper surface (intervening surface) 60…Concrete portion 71, 72, 81, 82…Deformable filling member (deformation promoting portion)

Claims

1. A deck plate for a deck composite slab, in which a plurality of peak portions and valley bottom portions that are continuous with each other are connected via inclined portions that are inclined alternately, an engaging portion that promotes engagement between the concrete portion and the deck plate in the deck composite slab through a groove formed at a transition portion between the inclined portion and the valley bottom portion and / or a convex portion that protrudes toward the valley bottom portion side in the inclined portion, a deformation promoting portion that promotes peeling of the deck plate from the concrete portion during thermal expansion, and comprising, the deformation promoting portion is provided in the groove at a predetermined interval along the extending direction of the groove so as to partially interrupt the extension of the groove, and deforms so that a gap is formed between it and the concrete portion during thermal expansion A deck plate for a deck composite slab, characterized in that.

2. The deformation promoting portion is an overhanging portion formed to overhang from the side of the groove toward the side of the valley bottom portion A deck plate for a deck composite slab according to claim 1, characterized in that.

3. The overhanging portion, a pair of inclined surfaces whose surfaces facing the extending direction of the groove extend in a direction intersecting each other, and an intervening surface extending along the extending direction of the groove between the pair of inclined surfaces, having A deck plate for a deck composite slab according to claim 2, characterized in that.

4. The deformation promoting portion is a thermoplastic filling member A deck plate for a deck composite slab according to claim 1, characterized in that.

5. The filling member has a tip portion that protrudes from the groove toward the valley bottom portion side and engages with the concrete portion. A deck plate for a deck composite slab according to claim 4, characterized in that.

6. The filling member is formed to taper from the side of the groove toward the side of the tip portion. A deck plate for a deck composite slab according to claim 5, characterized in that.

7. The convex portions are provided in a plurality at a predetermined interval along the extending direction of the inclined portion, the deformation promoting portion further includes a thermoplastic filling member provided between at least some of the convex portions and the convex portions A deck plate for a deck composite slab according to any one of claims 4 to 6, characterized in that.

8. A deck plate for a deck composite slab according to any one of claims 1 to 7, and a concrete portion formed by concrete placed on the deck plate, having A deck composite slab characterized by the above.

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