JP7630288B2 - Deck Plate Units and Composite Slabs - Google Patents

Description

The present invention relates to deck plate units and composite slabs.

Conventionally, in steel frame structures, a deck plate is fixed between beams made of H-shaped steel, and composite slabs such as floor slabs (floor structure) or ceiling slabs (ceiling structure) are constructed by pouring concrete on top of the deck plate and allowing it to harden.

In addition, a composite deck slab has been proposed in which reinforcing bars are placed around studs and wire mesh provided on the flanges of beams made of H-shaped steel, with the aim of preventing cracks from occurring in the concrete of the composite slab (see, for example, Patent Document 1).

JP 2020-041348 A

In recent years, there has been a demand for reducing the distance from the top of the beam to the top of the slab (concrete) in floor slabs and ceiling slabs (hereinafter referred to as "thickness"). Reducing the thickness of the slab leads to a reduction in material, rationalization of design, and reduction in construction costs due to a reduction in the amount of concrete used, but it also creates risks such as cracks in the concrete and reduced living performance, such as noise and vibration suppression.

In the composite deck slab of Patent Document 1, cracks in the concrete can be suppressed, but due to the structure in which studs and reinforcing steel bars are placed on the top surface of the flange portion of the H-shaped steel, it is difficult to make the slab thinner.

The present invention was made in consideration of the above points, and aims to provide a deck plate unit and composite slab with a simple structure that allows the thickness of the slab to be made thinner than conventional ones without compromising the strength, rigidity, or livability of the concrete.

To solve this problem, the deck plate unit of the present invention includes a deck plate made of corrugated steel plate having a corrugated section with a corrugated cross section in which the peak surfaces and valley bottom surfaces are alternately connected via inclined surfaces, and a spacer that joins the deck plate to the upper surface of the beam so as to suspend the deck plate with the corrugated section positioned below the upper surface of the beam.

In the present invention, the spacer is a member formed by bending a steel bar in order to place wire mesh or reinforcing bars above the deck plate, and preferably has a bridge section formed long in the longitudinal direction and multiple legs formed perpendicular to the bridge section.

In the present invention, it is preferable that the tips of the legs of the spacer are joined to the deck plate.

In the present invention, it is preferable that the deck plate has flat portions at both longitudinal ends parallel to the flange portions, and that the flat surfaces of the flat portions are joined to the upper surfaces of the flange portions.

In the present invention, it is preferable that the multiple legs of the spacer have a flange leg that is joined to the flange portion and a deck leg that is joined to the deck plate.

In the present invention, it is preferable that the bridge portion of the spacer that protrudes outward beyond both longitudinal ends of the deck plate is joined to the flange portion.

The composite slab of the present invention comprises a deck plate made of corrugated steel plate having a corrugated section with a corrugated cross section in which the peak surfaces and valley bottom surfaces are alternately connected via inclined surfaces, a spacer that joins the deck plate to the upper surface of the beam so as to suspend the deck plate with the corrugated section positioned below the upper surface of the beam, and concrete that has been poured onto the upper surface of the deck plate and hardened.

The present invention makes it possible to realize a deck plate unit and composite slab with a simple structure that allows the thickness of the slab to be made thinner than conventional ones without compromising the strength, rigidity, and livability of the concrete.

FIG. 2 is a schematic perspective view showing the external configuration of the deck plate unit according to the first embodiment of the present invention. FIG. 2 is a perspective view showing the external configuration of a deck plate according to the first embodiment of the present invention. FIG. 2 is a perspective view showing the external configuration when the deck plate in the first embodiment of the present invention is turned upside down. 1 is a longitudinal and lateral cross-sectional view showing the configuration of a composite slab using a deck plate unit in a first embodiment of the present invention. FIG. 1A and 1B are longitudinal and transverse cross-sectional views showing the difference in height between a composite slab using the deck plate unit in the first embodiment of the present invention and a comparative example. FIG. 11 is a schematic perspective view showing the external configuration of a deck plate unit according to a second embodiment of the present invention. 11A and 11B are longitudinal and lateral cross-sectional views showing the configuration of a composite slab using a deck plate unit in a second embodiment of the present invention. 11A and 11B are longitudinal and lateral cross-sectional views showing the difference in height between a composite slab using a deck plate unit in the second embodiment of the present invention and a comparative example.

1. Specific Example of the Embodiment (1-1) First Embodiment Hereinafter, the configuration of the deck plate unit and the composite slab according to the first embodiment of the present invention will be described in detail with reference to Figs. 1 to 5. Here, Fig. 1 is a schematic perspective view showing the external configuration of the deck plate unit in the first embodiment of the present invention. Fig. 2 is a perspective view showing the external configuration of the deck plate in the first embodiment of the present invention. Fig. 3 is a perspective view showing the external configuration when the deck plate in the first embodiment of the present invention is turned over. Fig. 4 is a longitudinal and transverse cross-sectional view showing the configuration of the composite slab using the deck plate unit in the first embodiment of the present invention. Fig. 5 is a longitudinal and transverse cross-sectional view showing the difference in height between the composite slab using the deck plate unit in the first embodiment of the present invention and a comparative example.

As shown in FIG. 1, the deck plate unit 10 is a unit consisting of a deck plate 20 and a spacer 30, and the deck plate 20 is spanned between beams 50, for example H-shaped steel, arranged opposite each other. However, for convenience, FIG. 1 shows only one of the beams 50. The flat portions 25 on both longitudinal ends of the deck plate 20 are placed on the upper surfaces of the flange portions 52 of the beams 50, and the two are fixed together by welding or the like.

As shown in FIG. 2, the deck plate 20 is formed from a thin steel plate and has a peak surface 21, which is a flat surface located at the peak portion, a valley bottom surface 22, which is a surface located at the valley bottom portion and is parallel or approximately parallel to the peak surface 21, and an inclined surface 23, which is a surface that connects the peak surface 21 and the valley bottom surface 22 and is inclined at a predetermined angle. The steel plate of the deck plate 20 may be subjected to a surface treatment such as zinc plating.

In this case, the deck plate 20 is formed by connecting the ends of a single plate, which is made up of two peak surfaces 21, three valley bottom surfaces 22, and four inclined surfaces 23. In FIG. 2, the single plate of the deck plate 20 is shown.

The deck plate 20 itself has a corrugated cross-sectional shape consisting of two corrugated sections 24, each of which consists of two valley bottom surfaces 22, one peak surface 21, and two inclined surfaces 23. The deck plate 20 also has flat sections 25 at both ends in the longitudinal direction, each of which has a plane parallel to the flanges 52, peak surfaces 21, and valley bottom surfaces 22 of the beams 50, and is end-closed.

As shown in FIG. 3, unlike the usual usage, the deck plate 20 is used upside down and spanned across the flange portion 52 of the beam 50, and the flat portions 25 on both ends of the deck plate 20 are placed on the top surface of the flange portion 52 of the beam 50 and attached together by welding or the like.

Therefore, as shown in Figures 4(A) and (B), the corrugated portion 24 of the deck plate 20 is not positioned above the upper surface of the flange portion 52 of the beam 50, but is positioned below the flange portion 52. In other words, the corrugated portion 24 of the deck plate 20 is bridged between the flange portions 52 of the two beams 50, and is positioned below the upper surface of the flange portions 52.

In addition, in the deck plate 20, spacers 30 of a predetermined height are arranged along the longitudinal direction on the back surface 24u of the corrugated portion 24 (i.e., the back surface of the peak surface 21). The spacers 30 are formed by bending bar-shaped steel (reinforced bars, deformed bars, etc.). The spacers 30 have a bridge portion 31 extending in the longitudinal direction, and multiple legs 32 formed to support the bridge portion 31 and extend downward perpendicular to the bridge portion 31.

The multiple legs 32 of the spacer 30 include flange legs 32a that are joined by welding or the like to the upper surface of the flange portion 52 of the beam 50, and multiple deck legs 32b that are joined by welding or the like to the underside 24u of the corrugated portion 24 of the deck plate 20. In this case, the deck legs 32b are formed longer than the flange legs 32a by the height between the upper surface of the flange portion 52 and the underside 24u of the corrugated portion 24 of the deck plate 20.

The bridge portion 31 of the spacer 30 is formed longer than the longitudinal length of the deck plate 20, and the flange leg portion 32a is positioned outside the flat portion 25 of the deck plate 20, but is formed to a length that does not extend outward beyond the flange portions 52 of the two beams 50.

In the spacer 30, the tip of the flange leg 32a is joined to the upper surface of the flange portion 52 of the beam 50, and the tips of the multiple deck legs 32b are joined to the back surface 24mu of the corrugated portion 24m of the deck plate 20. Therefore, the bridge portion 31 of the spacer 30 extends in a straight line parallel to the upper surface of the flange portion 52 and the back surface 24mu of the corrugated portion 24m of the deck plate 20.

The spacer 30 improves the strength and rigidity of the deck plate 20 in the longitudinal direction, and can also be used as a handle for workers to carry the deck plate 20 during construction. The number of flange legs 32a and deck legs 32b of the spacer 30 can be set arbitrarily according to the longitudinal length of the deck plate 20.

A lattice-shaped wire mesh 40 or reinforcing bars (hereinafter also referred to as "wire mesh 40, etc.") is placed on the spacer 30, and the spacer 30 and the wire mesh 40, etc. are joined together by welding, iron wire, etc. The spacer 30 is a member for arranging the wire mesh 40, etc. at a predetermined height above the deck plate 20, and the wire mesh 40, etc. can improve the strength of the concrete.

The floor slab 90 can be formed by pouring concrete 80 onto the top surface of the deck plate 20 and allowing it to harden. At this time, concrete 80 can also be poured into the inner space of the corrugated portion 24 of the deck plate 20.

Normally, as shown in Figure 5 (A), the deck plate 20 is placed on the top surface of the flange portion 52 of the beam 50 in the normal usage mode (see Figure 2), and concrete 80 is poured onto the top surface of the deck plate 20 and allowed to harden, forming the floor slab 100 of the comparative example.

In contrast, as shown in FIG. 5(B), if the deck plate 20 is placed upside down so that the corrugated portion 24 is positioned below the top surface of the flange portion 52 of the beam 50, concrete 80 can be poured into the inner space of the corrugated portion 24 to form a floor slab 90.

In this floor slab 90, the total height of the floor slab 90 can be reduced by the amount of arrow H1 compared to the floor slab 100 of the comparative example, without reducing the amount of concrete 80, by the amount that can be poured into the inner space of the corrugated portion 24 of the inverted deck plate 20.

In addition, the deck plate unit 10 is formed with the deck plate 20, spacer 30, and beam 50 already integrated, eliminating the need to join the spacer 30 and beam 50 to the deck plate 20 on-site, reducing construction time and costs.

(1-2) Second embodiment The configuration of the deck plate unit 200 according to the second embodiment of the present invention will be described in detail below with reference to Figs. 6 to 8. Fig. 6 is a schematic perspective view showing the external configuration of the deck plate unit according to the second embodiment of the present invention. Fig. 7 is a longitudinal and lateral cross-sectional view showing the configuration of a composite slab using the deck plate unit according to the second embodiment of the present invention. Fig. 8 is a longitudinal and lateral cross-sectional view showing the difference in height between a composite slab using the deck plate unit according to the second embodiment of the present invention and a comparative example.

As shown in FIG. 6, in which parts corresponding to those in FIG. 1 are given the same reference numerals, the deck plate unit 200 is a unit consisting of a deck plate 220 and a spacer 230, and the deck plate 220 is spanned between beams 50, for example H-shaped steel, arranged opposite each other. Note that in this case, only one of the beams 50 is shown.

As shown in Figures 7(A) and (B), in which parts corresponding to those in Figure 2 are given the same reference numerals, the deck plate 220 is formed from a thin steel plate and has a flat peak surface 21, a valley bottom surface 22 parallel or approximately parallel to the peak surface 21, and an inclined surface 23 connecting the peak surface 21 and the valley bottom surface 22. The steel plate of the deck plate 220 may be subjected to a surface treatment such as zinc plating.

In this case, the deck plate 220 is also formed by connecting multiple ends of a single plate consisting of two peak surfaces 21, three valley bottom surfaces 22, and four inclined surfaces 23. The single plate of the deck plate 220 has a corrugated cross-sectional shape consisting of two connected corrugated sections 24 consisting of two valley bottom surfaces 22, one peak surface 21, and two inclined surfaces 23.

The deck plate 220 is different from the deck plate 20 in the first embodiment in that it does not have flat portions 25 at both ends in the longitudinal direction, i.e., it is not end-closed, but is otherwise essentially the same as the deck plate 20.

In this case, the deck plate 220 is used in a normal manner without being turned upside down, unlike the deck plate 20 in the first embodiment. However, this is not limited to this, and the deck plate 220 may be used upside down, like the deck plate 20 in the first embodiment.

The deck plate 220 has spacers 230 arranged along the length of the valley bottom surface 22. The spacers 230 are formed by bending steel bars (reinforced bars) and have a bridge section 231 extending along the length and multiple legs 232 that support the bridge section 231 and extend downward perpendicular to the bridge section 231.

The bridge portion 231 of the spacer 230 is formed to be longer than the longitudinal length of the deck plate 220, but is formed to a length that does not extend beyond the flange portions 52 of the two beams 50. In addition, the multiple legs 232 of the spacer 230 have a length (height) equal to the distance from the upper surface of the flange portions 52 of the beams 50 to the valley bottom surface 22 when the deck plate 220 is suspended. In this case, the length (height) of the legs 232 of the spacer 230 can be set arbitrarily as long as it is shorter than the height of the beams 50.

The end of the bridge portion 231 of the spacer 230 is joined by welding to the upper surface of the flange portion 52 of the beam 50, and the tips of the multiple legs 232 are joined by welding or the like to the valley bottom surface 22 of the deck plate 220. As a result, the spacer 230 holds the deck plate 220 in a suspended state between the flange portion 52 of the beam 50 on one end side and the flange portion 50 of the beam 50 on the other end side.

In this way, the corrugated portion 24 of the deck plate 220 is not positioned above the upper surface of the flange portion 52 of the beam 50, but is positioned below the flange portion 52.

This spacer 230 also improves the longitudinal strength of the deck plate 220 and can be used as a handle for workers to carry the deck plate 220 during construction. Note that the number of legs 232 in the spacer 230 can also be set arbitrarily according to the longitudinal length of the deck plate 220.

A lattice-shaped wire mesh 40 or the like is placed on the spacer 230, and the spacer 230 and the wire mesh 40 or the like are joined together by welding, iron wire, or the like. The spacer 230 is also a member for arranging the wire mesh 40 or the like in a state where it is raised a predetermined height from the deck plate 220, and the wire mesh 40 or the like improves the strength of the concrete.

As shown in Figures 7(A) and (B), a floor slab 290 can be formed by pouring concrete 80 onto the deck plate 220 and allowing it to harden. At this time, concrete 80 can also be poured into the spaces between the corrugated portions 24 of the deck plate 220.

Normally, as shown in FIG. 8(A), a deck plate 220 is placed on the top surface of the flange portion 52 of the beam 50 in the normal manner, and concrete 80 is poured onto the top surface of the deck plate 220 and allowed to harden, forming the floor slab 300 of the comparative example.

In contrast, as shown in FIG. 8(B), if the deck plate 220 is placed in a suspended state by the spacer 130 so that the corrugated portion 24 is positioned below the upper surface of the flange portion 52 of the beam 50, the deck plate 220 can be positioned even lower than the upper surface of the flange portion 52 of the beam 50.

Therefore, in the floor slab 290, a larger amount of concrete 80 can be poured because the deck plate 220 is positioned lower, and concrete 80 can also be poured into the spaces between the corrugated sections 24, so that a floor slab 290 that is lower in height than the floor slab 300 of the comparative example can be formed while increasing the amount of concrete 80. In other words, the overall height of the floor slab 290 can be reduced by the amount of arrow H2 compared to the floor slab 300 of the comparative example.

In addition, in the floor slab 290, if the length of the legs 132 of the spacers 130 is made as long as possible while the deck plate 220 is suspended, the overall height of the floor slab 290 can be reduced accordingly. Conversely, if the amount of concrete 80 can be reduced as much as possible, the height of the floor slab 290 can be further reduced.

Furthermore, as in the first embodiment, the deck plate unit 200 has the deck plate 220, spacer 230, and beam 50 fixed in an integrated state in advance, eliminating the need to join the spacer 230 and beam 50 to the deck plate 220 on-site, thereby reducing construction time and costs.

2. Other Embodiments In this embodiment, the case where an H-shaped steel beam is used as the beam 50 has been described, but the present invention is not limited to this, and beams of other shapes may be used as long as they have a predetermined height.

In addition, those skilled in the art may appropriately modify the deck plate units 10, 200 and floor slabs 90, 290 of the present invention in accordance with previously known knowledge. As long as the configuration of the present invention is still achieved even after such modifications, it is of course within the scope of the present invention.

10, 200... deck plate unit, 20, 220... deck plate, 30, 230... spacer, 21... summit surface, 22... valley bottom surface, 23... inclined surface, 24... corrugated portion, 25... flat portion, 31, 231... bridge portion, 32, 232... legs, 32a... flange legs, 32b... deck legs, 40... wire mesh, 50... beam, 52... flange portion, 80... concrete, 90, 100, 290, 300... floor slab.

Claims (6)

A deck plate made of a corrugated steel plate having a corrugated portion having a cross-sectional corrugated shape in which peak surfaces and valley bottom surfaces are alternately connected via inclined surfaces;
A spacer that joins the upper surface of the beam and the deck plate,
The spacer has a bridge portion formed long in a longitudinal direction and a plurality of legs formed in a direction perpendicular to the bridge portion,
The plurality of legs include a flange leg portion joined to an upper surface of the beam and a deck leg portion joined to the deck plate,
The deck plate unit is configured so that the deck leg is longer than the flange leg by the height of the corrugated portion, and thereby the deck plate is suspended by the spacer so that the corrugated portion is positioned below the upper surface of the beam. A deck plate made of a corrugated steel plate having a corrugated portion having a cross-sectional corrugated shape in which peak surfaces and valley bottom surfaces are alternately connected via inclined surfaces;
A spacer that joins the upper surface of the beam and the deck plate,
The spacer has a bridge portion formed long in a longitudinal direction and a plurality of legs formed in a direction perpendicular to the bridge portion,
The tips of the multiple legs are joined to the deck plate and the bridge portion is joined to the upper surface of the beam, so that the deck plate is suspended by the spacer and the corrugated portion is positioned below the upper surface of the beam. 3. The deck plate unit according to claim 1, wherein the spacer is a member formed by bending a steel bar in order to place a wire mesh or a reinforcing bar on the deck plate. The deck plate unit according to claim 1 or 2, wherein the deck plate has flat portions at both longitudinal end portions that are parallel to the upper surfaces of the beams, and the flat surfaces of the flat portions are joinable to the upper surfaces of the beams. A deck plate made of a corrugated steel plate having a corrugated portion having a cross-sectional corrugated shape in which peak surfaces and valley bottom surfaces are alternately connected via inclined surfaces;
A spacer that joins the upper surface of the beam and the deck plate;
and concrete poured onto the upper surface of the deck plate and hardened.
The spacer has a bridge portion formed long in a longitudinal direction and a plurality of legs formed in a direction perpendicular to the bridge portion,
The plurality of legs include a flange leg portion joined to an upper surface of the beam and a deck leg portion joined to the deck plate,
A composite slab in which the deck leg is formed longer than the flange leg by the height of the corrugated portion, and the deck plate is suspended by the spacer so that the corrugated portion is positioned below the upper surface of the beam. A deck plate made of a corrugated steel plate having a corrugated portion having a cross-sectional corrugated shape in which peak surfaces and valley bottom surfaces are alternately connected via inclined surfaces;
A spacer that joins the upper surface of the beam and the deck plate;
and concrete poured onto the upper surface of the deck plate and hardened.
The spacer has a bridge portion formed long in a longitudinal direction and a plurality of legs formed in a direction perpendicular to the bridge portion,
A composite slab in which the tips of the multiple legs are joined to the deck plate and the bridge section is joined to the upper surface of the beam, and the deck plate is suspended by the spacer so that the corrugated section is positioned below the upper surface of the beam.

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