JP2023101161A - Deck plate for deck composite slab and deck composite slab - Google Patents

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

The present invention relates to deck plates and deck composite slabs for deck composite slabs.

BACKGROUND ART The floors of large-scale buildings such as high-rise buildings are constructed with deck composite slabs or the like formed of concrete (concrete parts) and deck plates. Deck plates used in deck composite slabs include, for example, slanted portions alternately slanted in different directions, and a plurality of crest portions and trough portions that are continuous with each other through the slanted portions. Shaped deck plates are known. In such a deck plate, a key portion (engagement portion) that can be engaged with concrete is formed as a structure for promoting synthesis (engagement) with concrete (see, for example, Patent Document 1). .

A deck composite slab is formed by integrating a deck plate and concrete by means of an engaging portion applied to the deck plate. This supports the constant loads acting on the floor as a rational composite structure, with the deck plate bearing the tensile force and the concrete bearing the compressive force.

On the other hand, it has been found that the capacity of the deck plate to bear the tensile forces in the deck composite slab during a fire is lost due to heat in the early stages of the fire, and the deck plate ceases to function 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, in the event of a fire, etc., the fulcrum position (joint position) is reinforced and the allowable load, span, etc. Deck synthetic slabs designed to improve performance and fire resistance are known (see, for example, Patent Document 2).

JP 2021-156142 A Japanese Patent Application Laid-Open No. 2020-41348

Heat is transferred to the concrete through the deck plate in the event of a fire. Concrete is built by solidifying through the hydration reaction of cement and water, and a large amount of water used for the hydration reaction remains inside the concrete. remains in Therefore, even if concrete is heated by a fire, it has the characteristic that the temperature does not rise easily due to the moisture inside, and the speed of temperature rise of concrete is slower than the speed of temperature rise of the deck plate. is known.

FIG. 9 is a conceptual diagram illustrating forces acting on a conventional composite deck slab 100 when a fire occurs. For example, the composite deck slab 100 based on US Pat. The deck plate 200 is subjected to an expansion force P1 that causes it to rapidly expand and expand due to heating during a fire. However, both ends of the deck plate 200 are restrained by the support beams B, and a restraining force P2 that restrains the extension of the deck plate 200 in the horizontal direction acts on the deck plate 200 . Therefore, the heated deck plate 200 is subjected to a contradictory force of expansion force and restraint force, and a force P3 acts to deform the composite deck slab vertically downward.

In deck composite slab 100, deck plate 200 is raised for composite with concrete 300 via engagements. In the event of a fire, the deck composite slab 100 prematurely loses its function as a structure. Nevertheless, when a fire occurs, the deck plate 200 is subjected to a force P3 that pulls the concrete 300 downward in the vertical direction due to its deformation. That is, in addition to supporting the vertical load that the deck composite slab is supposed to support, the vertically downward 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 of the causes of the deterioration of the fire resistance performance of the composite deck slab 100, and there is a need for countermeasures.

Therefore, the present invention has been made in view of the above problems, and promotes the separation of the deck plate from the concrete part in the event of a fire while ensuring the synthesis of the deck plate and the concrete part. An object of the present invention is to provide a technique for improving fire resistance performance.

In order to solve the above-mentioned problems, a deck plate for a composite deck slab according to the present invention is a corrugated deck formed by connecting a plurality of crests and valleys that are continuous to each other via alternately slanted slopes. A deck plate for a composite slab, comprising: an engaging portion used for engagement with a concrete portion of the composite deck slab; and a deformation promoting portion that promotes separation from the concrete portion during thermal expansion. In addition, the deformation promoting portion deforms so as to form a gap with the concrete portion during thermal expansion.

Further, in a deck plate for deck composite slab according to an aspect of the present invention, the engaging portion includes a groove formed in a transition portion between the inclined portion and the valley bottom portion, and the deformation promoting portion includes the are provided at predetermined intervals along the extending direction of the groove, and are formed to project from the groove side toward the valley bottom side so as to partially interrupt the extension of the groove. It may be an overhang.

Further, in a deck plate for a composite deck slab according to an aspect of the present invention, the projecting portion includes a pair of inclined surfaces extending in a direction in which the surfaces facing the extending direction of the grooves intersect with each other, and the pair of and an intervening surface extending along the extending direction of the groove between the inclined surface.

Further, in a deck plate for deck composite slab according to an aspect of the present invention, the engaging portion includes a groove formed in a transition portion between the inclined portion and the valley bottom portion, and the deformation promoting portion includes the Thermoplastic filling members may be provided at predetermined intervals along the extending direction of the groove and provided in the groove so as to partially interrupt the extension of the groove.

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

Moreover, in the deck plate for deck composite slab according to one aspect of the present invention, the filling member may be formed so as to taper from the groove side toward the tip portion side.

Further, in a deck plate for a composite deck slab according to an aspect of the present invention, the engaging portion includes a convex portion protruding toward the valley bottom in the inclined portion, and the convex portion is located on the inclined portion. A plurality of filling members may be provided at predetermined intervals along the extending direction, and the filling member may be provided between at least some of the protrusions.

Furthermore, in order to solve the above-mentioned problems, the deck composite slab according to the present invention is formed by connecting a plurality of peaks and valleys that are continuous to each other via concrete parts and alternately inclined inclined parts, a corrugated deck plate for engaging the concrete section, the deck plate having an engagement section adapted for engagement with the concrete section of the deck composite slab; and a deformation promoting portion that promotes separation from the concrete portion during thermal expansion, wherein the deformation promoting portion deforms so as to form a gap with the concrete portion during thermal expansion. .

Effect of the Invention According to the present invention, the deck plate and the concrete part can be combined together, and the separation of the deck plate from the concrete part in the event of a fire is promoted, thereby improving the fire resistance performance of the composite deck slab.

1 is a perspective view for explaining the configuration of a composite deck slab according to a first embodiment; FIG. 1 is a perspective view of a deck plate used in the composite deck slab according to the first embodiment; FIG. 3 is an enlarged view showing an engagement groove portion of the deck plate shown in FIG. 2; FIG. 3B is a cross-sectional view of the deck plate along line BB in FIG. 3A; FIG. FIG. 4 is a cross-sectional view of the deck plate taken along the longitudinal direction L at the engagement groove; FIG. 4 is a diagram schematically showing a state after disengagement between the deck plate and the concrete portion; FIG. 11 is a perspective view showing a partially enlarged deck plate for explaining a deformation promoting portion according to a modification; 6B is a cross-sectional view of the deck plate taken along line BB in FIG. 6A; FIG. It is an enlarged view which expands and shows a part of deck plate in 2nd Embodiment. FIG. 10 is a diagram for explaining a modification of the deformation promoting section in the second embodiment; FIG. 8B is a plan view for schematically explaining a modification of the deformation promoting portion according to the second embodiment; FIG. 2 is a conceptual diagram illustrating forces acting on a conventional composite deck slab when a fire occurs.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the following description, the drawings are schematic, and it should be noted that the dimensional relationship of each element, the ratio of each element, and the like may differ from reality. Even between the drawings, there are cases where portions having different dimensional relationships, ratios, etc. are included.

<First embodiment>
[Deck composite slab]
FIG. 1 is a perspective view for explaining the configuration of a composite deck slab 1 according to the first embodiment. The composite deck slab 1 according to the first embodiment is, for example, a composite structure composed of a steel deck plate 10 and a concrete portion 60, and is used for the ceiling or floor of a building such as a steel frame structure. is. In deck composite slab 1, deck plate 10 resists tensile forces and concrete section 60 resists compressive forces. As a result, the composite deck slab 1 can withstand a large load and span a long span between the support beams B of H-beam steel. In this embodiment, the flange of the support beam B is provided with a plurality of headed studs Sd along the extending direction of the flange. etc. may be applied.

In the following, the direction in which the deck plate 10 is bridged between the support beams B and the support beams B of the building is defined as the longitudinal direction (longitudinal direction) L of the deck plate 10, and the deck plate 10 intersects the longitudinal direction L. Let the extending direction be the lateral direction (width direction) W, and let the direction in which the deck plate 10 is placed on the support beams B be the height direction H of the deck plate 10 .

(deck plate)
FIG. 2 is a perspective view of a deck plate 10 used in the composite deck slab 1 according to the first embodiment. The deck plate 10 in the first embodiment is a corrugated synthetic deck slab formed by connecting a plurality of crest portions 11 and valley bottom portions 13 that are continuous to each other via inclined portions 15 that are alternately inclined in different directions. 1 deck plate 10, engaging portions 20, 30 used for engagement with the concrete portion 60 in the deck composite slab 1, and deformation promotion promoting separation from the concrete portion 60 during thermal expansion The deformation promoting portion 40 is characterized by being deformed (including deformation, transformation, dissolution, etc.) so that a gap S is formed between the concrete portion 60 and the concrete portion 60 during thermal expansion. The configuration of the deck plate 10 in the first embodiment will be specifically described below.

The deck plate 10 is a corrugated steel plate formed by roll forming a thin steel plate that has been subjected to surface treatment such as galvanization. The deck plate 10 may not be subjected to 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 wavy shape in which a crest portion 11 and a valley bottom portion 13 extending in the longitudinal direction L are continuous in the transverse direction W via an inclined portion 15 .

The single plate of the deck plate 10 is composed of two crests 11, one trough 13, and two pairs of inclined portions 15, and is formed in a corrugated cross section along the widthwise direction W. . Note that depending on the dimension of the deck plate 120 in the width direction W, one deck plate 120 may be provided with only one crest portion 121 . Also, when one deck plate 10 is connected to another deck plate 10 in the lateral direction W, the connecting portion between the deck plates 10 functions as a valley bottom portion 13 . Also, the deck plate 10 may be subjected to end closing processing at both ends in the longitudinal direction L. As shown in FIG.

The crest portion 11 is flat and positioned above the support beams B in a state in which the deck plate 10 is bridged between the support beams B (hereinafter also referred to as a “bridge state”). It is a formed portion and is a plate-like portion extending in the longitudinal direction L. The crest 11 has grooves 12 . The groove 12 is formed so as to be recessed toward the valley bottom 13 side. The groove 12 extends in the longitudinal direction L, and is provided near the center in the lateral direction W when the number of grooves 12 is one.

The grooves 12 in the crest portion 11 improve the strength of the crest portion 11 . The groove 12 is not limited to the case where one is formed in the peak portion 11, and a plurality of grooves 12 may be formed. Note that the groove 12 may not be formed.

The valley bottom 13 is parallel or substantially parallel to the crest 11, and is a flat portion placed on the support beam B in the bridging state. The valley bottom 13 is a plate-like portion extending in the longitudinal direction L. As shown in FIG. The valley bottom 13 does not overlap the crest 11 in the lateral direction W. As shown in FIG. Note that the groove 12 formed in the peak portion 11 may be formed in the valley bottom portion 13 .

The inclined portion 15 is a portion that connects the peak portion 11 and the valley bottom portion 13 and is a plate-like portion that extends in the longitudinal direction L. As shown in FIG. The inclined portion 15 obliquely extends from both end portions of one peak portion 11 in the lateral direction W toward the valley bottom portion 13 side. 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 .

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 projections 21 are formed by, for example, embossing from the surfaces of the adjacent inclined portions 15 via one peak portion 11 so as to protrude in mutually opposite sides (toward the valley bottom portion 13 side). It is a convex part. A plurality of engaging protrusions 21 are provided at predetermined intervals along the extending direction (longitudinal direction L) of the inclined portion 15 . The engaging recesses 22 are positioned between the engaging protrusions 21 along the longitudinal direction L. As shown in FIG. The engagement projections 21 and the engagement recesses 22 increase the strength of the inclined portion 150 and promote the engagement between the concrete portion 60 and the deck plate 10, which will be described later, to enhance the combined effect.

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 of the pair of inclined portions 15 of the one peak portion 11 that protrudes to the opposite sides. That is, the bulging portions 14 of the pair of inclined portions 15 facing each other with the valley bottom 13 interposed therebetween are formed to face each other and bulge toward each other. The bulging portion 14 is located on the valley bottom 13 side with respect to the engaging convex portion 20 .

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 root portion 13 (hereinafter also referred to as "engaging groove 30"). say). A cross section of the engagement groove 30 along the widthwise direction W is curved. The engaging grooves 30 are formed in a pair of inclined portions 15 on one crest portion 11 so as to approach each other. That is, in the pair of inclined portions 15 that are continuous with the valley bottom portion 13 of the deck plate 10, the engaging grooves 30 are formed so as to face each other and are curved in directions away from each other. The engaging groove 30 promotes the engagement between the concrete portion 60 and the deck plate 10, which will be described later, and enhances the synthesizing effect.

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 extending of the engaging groove 30 . The deformation promoting portion 40 is a protruding portion (hereinafter also referred to as “deformation protruding portion 40”) formed to protrude from the engaging groove 30 side toward the valley bottom portion 13 side. The deformed projecting portion 40 is a portion that actively promotes deformation when, for example, the composite deck slab 1 is heated and the deck plate 10 is deformed due to thermal expansion in the event of a fire.

FIG. 3A is an enlarged view showing an enlarged portion of the engagement groove 30 of the deck plate 10 shown in FIG. 2. FIG. FIG. 3B is a cross-sectional view of deck plate 10 taken along line BB in FIG. 3A. The deformed projecting portion 40 is formed on the side facing the valley bottom portion 13 by, for example, embossing so as to push out the deck plate 10 at each engaging groove 30 . That is, the deformed projecting portion 40 projects in the lateral direction W toward the continuous valley bottom portion 13 from each engaging groove 30 formed in the inclined portion 15 continuous to the one peak portion 11 . . The extension of each engagement groove 30 in the longitudinal direction L is interrupted by the deformed projecting portion 40, and the engagement groove 30 is divided in the width direction W so that a plurality of recesses and protrusions are continuous. ing. As a result, the engagement between the deck plate 10 and the concrete portion 60 is ensured in the divided engagement grooves 30 in the normal state, and the engagement between the deck plate 10 and the concrete portion 60 when the deck plate 10 is heated. It is possible to secure a portion that promotes release.

The deformed projecting portion 40 has a pair of inclined surfaces 41 and projecting surfaces (intervening surfaces) 42 . The pair of inclined surfaces 41 are surfaces facing the extending direction (longitudinal direction L) of the engaging groove 30 and extend in mutually intersecting directions toward the adjacent valley bottoms 13 . A pair of inclined surfaces 41 extend along the longitudinal direction L from a surface or portion defining the engaging groove 30 facing the lateral direction W toward the valley bottom 13 adjacent to the engaging groove 30, that is, the lateral direction. They extend in direction W so as to approach each other.

The protruding surface 42 is continuous with the inclined surface 41 on the side opposite to the portion of the inclined surface 41 that is continuous with the surface or portion defining the engagement groove 30 facing the width direction W. The projecting surface 42 extends along the extending direction of the engaging groove 30 (longitudinal direction L) between the pair of inclined surfaces 41 . The protruding surface 42 may be formed at the same position in the longitudinal direction L as the protruding surface 42 of the engaging groove 30 facing each other with the valley bottom 13 therebetween, or may be formed at a different position.

(concrete section)
The concrete portion 60 is formed by hardening the concrete placed on the deck plate 10 . Inside the concrete portion 60, for example, a reinforcing bar (not shown) for preventing cracks, a welded wire mesh 61 (see FIG. 1), or the like may be embedded.

[Deck composite slab characteristics]
According to the composite deck slab 1 described above, an improvement in fire resistance can be specified. For example, assuming that the deck composite slab 1 collapses at the fulcrum position, which is the joint with the support beam B, in the event of a fire, the fulcrum position (joint position) is reinforced to improve allowable performance such as load and span. and improved fire resistance. A plurality of studs Sd provided on the flange of the support beam B are provided as reinforcement means. The studs Sd are arranged in the lateral direction W on the support beam B. As shown in FIG. In addition, the performance of the composite deck slab 1 is further improved by arranging reinforcing bars (not shown) and elongated steel plates (not shown) along the rows of studs Sd.

Such a reinforcing means improves the pull-out strength of the edge of the composite deck slab 1, improves the degree of fixation to the support beam B, prevents cracks at the edge of the composite deck slab 1, and suppresses crack expansion. It is possible to increase the allowable performance such as payload and span. As a result, the stress generated around the stud Sd can be dispersed, and the edge of the composite deck slab 1 can be reinforced, thereby improving the fire resistance.

In the synthetic deck slab 1 at the time of fire, the deck plate 10 is first heated and then the concrete portion 60 is heated by the flames burning the ceiling from below. Since the concrete portion 60 contains a large amount of moisture inside, it has a characteristic that the temperature does not easily 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 portion 60 .

For example, the thermal expansion coefficients of the deck plate 10 and the concrete portion 60, which are steel materials in the deck composite slab 1, are approximately 11.0×10 ⁻⁶ ° C. (0.1 mm expansion/contraction per unit length of 1 m with a temperature change of 10 K). are identical. However, the deck plate 10 and the concrete portion 60 have significantly different temperature rise rates depending on the circumstances of the fire. Significant against swelling.

Here, deformation of the deck plate 10 will be described with reference to FIG. FIG. 4 is a cross-sectional view of the composite deck slab taken along the longitudinal direction L at the engagement groove 30. As shown in FIG. When the deck plate 10 is heated by the flames of the fire, the deck plate 10 tries to deform by thermal expansion so as to elongate. However, since the deck plate 10 is fixed to the support beams B at the ends in the longitudinal direction L, a contracting force in the longitudinal direction L acts on the deck plate 10 .

The deck plate 10 is easily deformed by the deformation projecting portion 40 . Forces acting on the pair of inclined surfaces 41 collide at the projecting surface 42 . The force generated inside the deck plate 10 loses a place to escape, and the deck plate 10 deforms or buckles at each deformed projecting portion 40 so as to swell toward the side opposite to the concrete portion 60 (arrow P4). As a result, the mutual engagement (restriction) 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 part 60, the deck plate 10 is restrained from pulling the concrete part 60, and the adverse influence of the deck plate 10 on the entire deck composite slab 1 is eliminated. can be done.

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 deformed projecting portion 40 for the purpose of intentionally promoting its deformation, the gap between the deck plate 10 and the concrete portion 60 is S is formed. 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 the air layer S is provided between the deck plate 10 and the concrete portion 60 . That is, since the deck plate 10 is actively deformed in the event of a fire, an air layer S having an additional heat insulating effect is formed between the deck plate 10 and the concrete portion 60, and the fire resistance performance of the composite deck slab 1 is further improved. can be improved.

<Modification>
FIG. 6A is a perspective view showing a partially enlarged deck plate 10A for explaining the deformation promoting portion 50 according to the modification. FIG. 6B is a cross-sectional view of deck plate 10A taken along line BB in FIG. 6A. The same reference numerals are given to the same components as those of the deck plate 10 described above, and the description thereof is omitted. The deck plate 10A differs in the deformed overhang 40 of the deck plate 10. As shown in FIG.

The deformation promoting portion 40 in the first embodiment is formed to protrude in the lateral direction W from the engaging groove 30 . On the other hand, the deformation promoting portion 50 according to the modified example is formed so that the surface of the engaging groove 30 facing the peak portion 11 protrudes in the height direction H toward the peak portion 11 (hereinafter referred to as Also referred to as “deformation protuberance 50”).

The deformed raised portion 50 is formed on the side facing the peak portion 11 by, for example, embossing so as to push out the deck plate 10 at each engagement groove 30 . That is, the deformed protruding portion 50 is formed to protrude in the height direction H in each engaging groove 30 formed in the inclined portion 15 continuous to the one peak portion 11 . The extension of each engagement groove 30 in the longitudinal direction L is interrupted by the deformed raised portion 50 so that the engagement groove 30 is concave in the lateral direction W and convex in the height direction H. split.

The deformed raised portion 50 has a pair of inclined surfaces 51 and a top surface (intervening surface) 52 . The pair of inclined surfaces 51 are surfaces facing the extending direction (longitudinal direction L) of the engaging groove 30 and extend in directions that intersect each other. The pair of inclined surfaces 51 extend along the longitudinal direction L from the surface or portion of the engagement groove 30 facing the top surface 52 toward the top surface 52 so as to approach each other.

The top surface 52 is continuous with the sloped surface 51 on the side opposite to the portion of the sloped surface 51 that is continuous with the surface or portion of the engagement groove 30 facing the top surface 52 . The top surface 52 extends along the extending direction (longitudinal direction L) of the engaging groove 30 between the pair of inclined surfaces 51 . The top surface 52 is preferably in contact with the bulging portion 14, but may not be in contact with the bulging portion 14 if the gap between it and the bulging portion 14 is small. The deformed raised portion 50 may be formed at the same position in the longitudinal direction L in the engaging grooves 30 facing each other across the valley bottom portion 13, or may be formed at a shifted position.

The deck plate 10A is easily deformed by the deformation protuberances 50 . Forces acting on the pair of inclined surfaces 51 collide at the top surface 52 . The force generated inside the deck plate 10A has no escape, and the deck plate 10A deforms or buckles at each deformed protuberance 50 so as to swell to the side opposite to the crest 11 . As a result, the mutual engagement (restraint) 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, the deck plate 10A is restrained from pulling the concrete portion 60 downward in the vertical direction, and the entire deck composite slab 1 is prevented from being adversely affected by the deck plate 10A. influence can be eliminated.

<Second Embodiment>
Next, a composite deck slab 8 according to a second embodiment will be described with reference to FIG. FIG. 7 is an enlarged view showing a part of the deck plate 10B in the second embodiment. The same reference numerals are assigned to the same configurations as those of the composite deck slab 1 according to the first embodiment, and the description thereof is omitted. The composite deck 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, engaging portions 20 and 30, and deformation promoting portions 71 and 72.

A plurality of deformation promoting portions 71 are provided at predetermined intervals along the extending direction (longitudinal direction L) of the engaging groove 30 so as to partially interrupt the extending of the engaging groove 30 . In the present embodiment, the deformation promoting portion 71 is a filling member (hereinafter also referred to as “deformation filling member 71”) made of thermoplastic resin or the like. The material is not particularly limited as long as the filling member is made of metal, alloy, or the like. The deformation filling member 71 is, for example, a portion that actively promotes melting (deformation) before the synthetic deck slab 8 is heated and the deck plate 10B is deformed due to thermal expansion when a fire occurs.

The deformation promoting portion 72 is provided in the engaging concave portion 22 of the engaging portion 20 . In the present embodiment, the deformation promoting portion 72 is a filling member (hereinafter also referred to as “deformation filling member 72”) made of thermoplastic resin or the like. The material is not particularly limited as long as the filling member is made of metal, alloy, or the like. Specifically, the deformed filling member 72 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. As shown in FIG. As a result, it is possible to partially secure the engagement between the deck plate 10B and the concrete portion 60 in the normal state at the engagement portion 20, while securing a portion that promotes disengagement when the deck plate 10B is heated. can be done.

Further, the deformable filling member 71 is provided so as to partially fill the engaging groove 30 along the longitudinal direction L. As shown in FIG. The deformable filling members 71 are provided at predetermined intervals in the longitudinal direction L, and the engaging groove 30 is divided in the lateral direction W such that a plurality of concave and convex concave and convex portions are continuous. . That is, the engaging groove 30 becomes a concave portion, and the deformation filling member 71 becomes a convex portion. As a result, while securing the normal engagement between the deck plate 10B and the concrete portion 60 in the divided engagement grooves 30, a portion that promotes disengagement when the deck plate 10B is heated is secured. be able to. Note that the deformable filling member 71 is accommodated within the engagement groove 30 so as not to extend beyond the bulging portion 14 in the lateral direction W. As shown in FIG.

According to the composite deck slab 8 according to the second embodiment, the deformed filling members 71 and 72 are the first to melt in the early stages of a fire. As a result, the volumes of the deformed filling members 71 and 72 after melting increase, and they try to move away from the concrete portion 60 so as to promote the thermal expansion of the heated deck plate 10B. As a result, the deck plate 10B and the melted deformed filling members 71 and 72 can move relative to each other at the interface where the deformed filling members 71 and 72 are provided, so that the deck plate 10B is not deformed. will be able to

As the deck plate 10B deforms away from the concrete portion 60, the melted deformed filling members 71 and 72 also move away from the concrete portion 60 together. As a result, a gap S is created between the deck plate 10B and the concrete portion 60 in the deformed filling portion 71 . Melting of the deformed filling members 71 and 72 promotes elongation due to thermal expansion of the deck plate 10B, so that the deformed filling members 71 and 72 serve as starting points for inducing separation between the deck plate 10B and the concrete portion 60 in the event of a fire. becomes.

Note that the deformed filling member 72 in the present embodiment may be provided in the engaging recess 22 of the deck plate 10 in the first embodiment.

<Modification>
FIG. 8A is a diagram for explaining a modification of the deformation promoting section 80 according to the second embodiment. FIG. 8B is a plan view for schematically explaining a modification of the deformation promoting portion 80 according to the second embodiment. The deformed filling member 71 in the second embodiment was formed so as to fit inside the engagement groove 30 . On the other hand, the modified filling member 81 according to the modified example is formed so as to protrude in the lateral direction W from the engagement groove 30 .

The modified filling member 81 is a filling member made of thermoplastic resin or the like, but may be a filling member made of a metal or alloy having a melting point lower than that of the deck plate 10B, for example.

The deformed filling member 81 obliquely protrudes from the engaging groove 30 in the lateral direction W toward the valley bottom portion 13 and the adjacent crest portion 11 at the distal end portion 81 . The deformed filling member 81 is formed to taper from the engagement groove 30 side toward the tip portion 81 side. That is, the width in the longitudinal direction L of the deformable filling member 81 is formed so as to continuously decrease from the engagement groove 30 side toward the tip portion 82 side. The cross-sectional shape of the deformed filling member 81 in the longitudinal direction L is trapezoidal or substantially trapezoidal in this embodiment, but may be triangular.

The deformable filling member 81 is provided so as to partially fill the engagement groove 30 along the longitudinal direction L. As shown in FIG. The deformed filling member 81 is continuously provided in the longitudinal direction L, and the engaging groove 30 is divided in the lateral direction W such that a plurality of concave and convex concave and convex portions are continuous. That is, the engaging groove 30 becomes a concave portion, and the deformation filling member 71 becomes a convex portion. Since the deformed filling member 81 is formed so as to taper toward the distal end portion 82 , the width between the adjacent deformed filling members 81 widens in the lateral direction W from the engagement groove 30 side. A gap like this occurs.

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 (hereinafter also referred to as “deformation filling member 72”) made of thermoplastic resin. Alternatively, the material is not particularly limited as long as the filling member is made of an alloy or the like. Specifically, the deformed 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. As shown in FIG.

When the modified filling member 81 according to the modified example is employed, the amount of engagement between the deck plate 10B and the concrete portion 60 in the engaging groove 30 is reduced compared to when the modified filling member 71 is employed. However, the tip portion 82 of the deformable filling member 81 protrudes in the lateral direction W, and the tip portion 82 plays a role of enhancing the combination with the concrete portion 60 .

In addition, since the deformed filling member 81 has a larger volume than the distal end portion 82 in the engagement groove 30, the amount of melted portion increases when heated by a fire. Therefore, a larger gap (air layer) S is formed between the deck plate 10B and the concrete portion 60, and separation between the deck plate 10B and the concrete portion 60 can be promoted.

The cross-sectional shape of the deformable filling member 81 in the longitudinal direction L is not particularly limited, and may be rectangular. Further, the modified filling member 81 in this embodiment may be provided in the deck plate 10 in the first embodiment.

<Others>
Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and includes all aspects included in the concept of the present invention and the scope of claims. Moreover, each configuration may be selectively combined as appropriate 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 embodiment may be appropriately changed according to the specific usage of the present invention. The purpose of the composite deck slabs 1, 8 according to the present invention is, for example, not to hinder the deformation of the deck plates 10, 10A, 10B due to heating in the event of a fire. , and the shapes of the engaging protrusions 20 and the engaging grooves 30 are not limited to the above-described embodiment and the like.

REFERENCE SIGNS LIST 1, 8 Deck composite slab 10, 10A, 10B Deck plate 11 Peak portion 13 Bottom portion 15 Inclined portion 20 Engagement portion 21 Engagement projection 22 Engagement recess 30 Engagement groove (engagement part)
40 ... Deformation projecting portion (deformation promoting portion)
41... Inclined surface, 42... Overhanging surface (intervening surface),
50 ... deformation protruding portion (deformation promoting portion)
51... Inclined surface, 52... Top surface (intervening surface)
60... Concrete part 71, 72, 81, 82... Deformation filling member (deformation promoting part)

Claims (8)

A deck plate for a corrugated composite deck slab formed by a series of peaks and valleys that are continuous with each other via alternating slopes, comprising:
an engagement portion provided for engagement with a concrete portion of the deck composite slab;
a deformation promoting portion that promotes separation from the concrete portion during thermal expansion;
with
A deck plate for a composite deck slab, wherein the deformation promoting portion deforms so as to form a gap with the concrete portion when thermally expanded. the engagement portion includes a groove formed in a transition portion between the slope portion and the valley bottom;
The deformation promoting portions are provided at predetermined intervals along the extending direction of the groove, and extend from the groove side to the valley bottom side so as to partially interrupt the extension of the groove. A deck plate for a composite deck slab according to claim 1, characterized in that it is a ledge formed to bulge out. The projecting portion is
a pair of inclined surfaces extending in directions in which surfaces facing the extending direction of the groove intersect each other;
an intervening surface extending along the extending direction of the groove between the pair of inclined surfaces;
A deck plate for a deck composite slab according to claim 2, characterized by: the engagement portion includes a groove formed in a transition portion between the slope portion and the valley bottom;
The deformation promoting portions are provided at predetermined intervals along the extending direction of the groove, and are thermoplastic filling members provided in the groove so as to partially interrupt the extension of the groove. A deck plate for a deck composite slab according to claim 1, characterized in that: 5. The deck plate of claim 4, wherein said filler member has a tip portion projecting from said groove toward said root portion for engaging said concrete portion. 6. A deck plate for a composite deck slab according to claim 5, wherein said filling member is formed so as to taper from said groove side toward said tip portion side. the engaging portion includes a convex portion that protrudes toward the valley bottom in the inclined portion;
A plurality of the convex portions are provided at predetermined intervals along the extending direction of the inclined portion,
A deck plate for a composite deck slab according to any one of claims 4 to 6, characterized in that said filling member is provided between at least some of said protrusions and said protrusions. . a concrete part;
a corrugated deck plate that is formed of a plurality of crests and valleys that are continuous with each other via alternately slanted slanted portions and that engages with the concrete portion;
A deck composite slab comprising:
The deck plate is
an engagement portion provided for engagement with a concrete portion of the deck composite slab;
a deformation promoting portion that promotes separation from the concrete portion during thermal expansion;
have
The composite deck slab, wherein the deformation promoting portion deforms so as to form a gap with the concrete portion when thermally expanded.

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