JP6160857B2 - Deck plate and floor structure - Google Patents

Description

  The present invention relates to a deck plate provided with a substrate portion and a plurality of reinforcing ribs protruding from the substrate portion, and a floor structure constructed using the deck plate.

FIG. 11 shows a cross section having a substrate portion 2 and a large portion 3b from the substrate portion 2 that has a constricted portion 3a that is an overlapping portion in the illustrated example on the substrate portion 2 side and that forms a space 3c on the distal end side. A deck plate made of a thin steel plate having a plurality of reinforcing ribs 3 protruding in shape is shown. A short width flat portion 2a is provided at one edge in the width direction of the substrate portion 2, and a locking piece 2b bent into an L shape is provided at the other edge. This type of deck plate is generally called a flat deck plate, but there is also a flat deck plate in which the reinforcing rib does not have an enormous portion and is simply folded into an L shape or an I shape.
This type of deck plate is used, for example, as a formwork for casting concrete by spanning between beams when building a floor slab or roof slab of a steel structure, reinforced concrete structure, or steel reinforced concrete structure.

In general, this type of deck plate is laid with the reinforcing rib 3 on the lower side. Usually, the deck plate length is as shown in the deck plate 1 'shown in FIGS. 12 (a), (b), and (c). The reinforcing rib 3 at the end in the direction is crushed toward the substrate portion 2 to form a crushed end 4 ′, and the crushed end 4 ′ is hung on the beam 5 (Patent Document 1).
If the end portion of the deck plate in the length direction (hereinafter, simply referred to as the length direction end portion) is not crushed, the placed concrete enters the enormous portion 3b of the reinforcing rib 3, and the amount of use of the concrete is unnecessarily increased. Since the cost is increased and the floor weight is also increased, it is not appropriate. Also, in order to save the floor height, as described above, the end portion in the longitudinal direction is crushed so that the upper surface height position of the deck plate is I try to lower it.
In this case, since the crushing end portion 4 ′ has a thickness, a gap is formed under the substrate portion 2 when the end portion in the length direction is simply crushed, so that the substrate portion 2 at the end portion is replaced with the substrate portion. A pan 2c is formed by being recessed from the upper surface.

  Since this type of deck plate is characterized in that a flat surface is formed on the entire upper surface as generally called a flat deck plate, it is common to lay the reinforcing rib 3 downward as described above. Patent Document 2 (Japanese Patent Laid-Open No. 8-218538) shows a case in which a flat deck plate that eliminates the need for crushing of the end portion and facilitates mounting of the ceiling hanger is laid with the reinforcing rib on the upper side. Has been. That is, the reinforcing rib of Patent Document 2 basically has a cross-sectional shape similar to that of the reinforcing rib 3 of FIG. 11, and forms an enormous space that forms a triangular space with the two-layer overlapping portion (the vertical strip portion 2a of Patent Document 2). Part (the hollow strip part 2b of Patent Document 2), but the end in the length direction is not configured to be crushed to close the space of the enormous part.

  In Patent Document 3 (Japanese Patent Laid-Open No. 9-4107), when the flat deck plate is coated, spot welding is performed to prevent the double-layered portion (vertical overlapping portion 2a of Patent Document 3) from expanding in the reinforcing rib. The basic structure is the same as that of Patent Document 2, although the purpose is to make it possible.

  By the way, although it is not a so-called flat deck plate, in the case of a normal deck plate in which a horizontal peak surface and a valley surface are continuously sloped to form a trapezoidal corrugated cross-sectional shape, the end portion in the length direction is not particularly treated. Then, since the concrete cast from the space below the mountain surface flows downstairs, it is necessary to have a means to prevent concrete leakage, crushing and closing the mountain part at the end in the length direction and closing the beam mounting part. This is also referred to as an encro deck plate (Patent Document 4: Japanese Patent Application Laid-Open No. 2007-077645).

JP-A-6-123153 JP-A-8-218538 JP-A-9-4107 JP2007-077645

  In the case of using the reinforcing rib with the upper side, in Patent Document 2, the end portion in the length direction is not configured to be crushed to close the space of the enormous portion. Therefore, the cast concrete enters a huge part, increasing the amount of concrete used and increasing the cost. Also, since the amount of concrete exceeds the design, the floor weight also increases and the allowable stress at the time of design may be exceeded. obtain.

  Then, although the case of the crushing edge part formed by crushing the length direction edge part from the top like patent document 1 is considered, the height of an edge part cross section will almost disappear, and the cross-sectional performance of an edge part will be sufficient. Although it is greatly reduced, it is desirable to prevent the deterioration of the cross-sectional performance as much as possible at the end.

  If the deck plate 1 ′ having the crushing end 4 ′ of FIG. 12 is laid upside down with the reinforcing rib 3 facing upward as in Patent Document 2, the deck plate 1 ″ of FIG. Thus, the above-described problem of Patent Document 2 in which the placed concrete enters the enormous portion is eliminated, and the pan 2c in FIG.

Whether the general usage as shown in FIG. 12 or the upside-down usage as shown in FIG. 13 is used, the reinforcing rib 3 is crushed from above to form a crushed end portion. In the end processing that crushes the reinforcing rib 3 from above to form the crushing end portion 4 ′, it is complicatedly folded and crushed, so that it is difficult to always obtain a constant crushing end shape, and a clean appearance Must not.
In addition, it is desirable to obtain a deck plate that can be improved in various respects as compared with a deck plate having an end portion crushed from above as in the prior art.

  The present invention has been made in view of the above circumstances, and when a deck plate having a plurality of reinforcing ribs having enormous portions is used with the reinforcing ribs on the upper side, the placed concrete is at the end in the longitudinal direction. The purpose is to obtain a deck plate that does not enter into the enormous part of the reinforcing rib. Also, when the end part of the reinforcing rib in the length direction of the deck plate is crushed to prevent the invasion of the enormous part of the concrete, the crushing is performed. It is an object of the present invention to obtain a deck plate that is easy to process and has little deterioration in cross-sectional performance at the end due to crushing, and is improved in other respects.

The invention of claim 1 that solves the above-described problem includes a substrate portion and a plurality of reinforcing ribs that protrude from the substrate portion in a cross-sectional shape having a constricted portion on the substrate portion side and a massive portion on the distal end side. A deck plate with
The crushing end portion that crushes the reinforcing ribs from both sides in the deck plate width direction in a manner in which the bulging portion plate material of the bulging portion tip side portion is folded inward at both ends in the deck plate length direction to close the bulging portion. It is characterized by having.

The invention according to claim 2 is a deck plate comprising a substrate portion and a plurality of reinforcing ribs protruding from the substrate portion in a cross-sectional shape having a narrowed portion on the substrate portion side and a massive portion on the tip side. There,
The reinforcing ribs are squeezed from both sides in the deck plate width direction in such a manner that the bulging part plate material of the bulging part tip side part further extends in the tip direction and is in a stacked state at both ends of the deck plate length direction. It has a closed crushing end.

Claim 3 is the deck plate as claimed in claim 1 or 2, wherein said Subomari portion of the reinforcing rib is closed Subomari unit without clearance, the deck plate both longitudinal ends of the enlarged portion of the reinforcing rib deck By being crushed from both sides in the plate width direction, a closed space is formed inside the reinforcing rib as a whole deck plate.

The invention of the floor structure of claim 4 is constructed by placing a plurality of deck plates according to any one of claims 1 to 3 , spanning between the beams with the reinforcing rib on the upper side, and placing concrete thereon. It is characterized by that.

In the invention of the floor structure according to claim 5 , one of the first floor and the second floor continuous on a common beam is an equal thickness slab, and the other is a synthetic slab,
The equal thickness slab is a slab constructed by placing concrete using a formwork whose entire upper surface is a flat surface,
The synthetic slab is a slab constructed by casting concrete using a deck plate having a projection integrally bonded to the concrete after the concrete is hardened to the concrete to be placed,
The synthetic slab is constructed by placing concrete using the deck plate according to any one of claims 1 to 3 as a formwork, and the upper surface height position is the same as the equal thickness slab. Features.

According to the present invention, the deck plate length direction both ends of the enormous portion of the reinforcing rib are crushed from both sides of the deck plate width direction to form a closed crushed end portion. Even if the concrete is laid on the beam with the facing up, the concrete does not enter the enormous portion of the reinforcing rib at the end of the deck plate in the longitudinal direction.
Accordingly, it is possible to prevent the amount of the concrete from being used more than designed and to prevent an increase in cost due to an increase in the amount of concrete. In addition, since the construction is performed with the concrete amount as designed, the floor weight does not increase beyond the design weight, and there is no possibility of exceeding the allowable stress at the time of design.

In the end processing that crushes the reinforcing rib from above as in the conventional case, since it is folded in a complicated manner and crushed, it is difficult to always obtain a constant crushing end shape, and it does not become a clean appearance, As described above, in the end processing for crushing from both sides of the deck plate width direction, a constant crushing end shape is always obtained, and a clean appearance is obtained.
Compared with the conventional process of crushing the entire reinforcing rib from above, the process of crushing from both sides of the deck plate width direction according to the present invention requires only a large part of the crushing process, so the force required for the process is small. That's it.

  Compared with the conventional crushing end portion formed by crushing from above, the cross-sectional height is substantially reduced and the cross-sectional performance is greatly reduced, and the crushing is formed from both sides of the deck plate width direction of the present invention. Since the crushing end portion maintains the cross-sectional height, the cross-sectional performance is large.

By laying the deck plate according to the present invention with the reinforcing rib having the enormous portion on the upper side as in claim 4 , there is a concrete synthesis effect in which the enormous portion is casted to the concrete, and the deck plate is a simple mold. Not only the frame, but also functions as a structural member after the concrete is hardened, and a so-called synthetic slab can be constructed.

Compared to the case where the reinforcing ribs are crushed from above as in the conventional case, when crushed from both sides in the deck plate width direction, the crushed portion transitions to a reinforcing rib cross-sectional shape that is not affected by edge processing. Since the cross-sectional gradual change region in the deck plate length direction can be shortened, the deformation region in the deck plate length direction can be shortened.
Therefore, it is possible to shorten the region of the deformed portion (crushed end portion + cross-sectional gradual change region) having a low concrete synthesis effect.

When the floor structure of claim 4 is constructed with a concrete volume that has a cross-sectional performance equivalent to that of a synthetic slab using a normal deck plate having a trapezoidal corrugated cross-sectional shape, the deck for a composite floor slab having the trapezoidal corrugated cross-sectional shape. The slab thickness can be reduced as compared with a synthetic slab using a plate (details will be described later).
Therefore, as according to claim 5, in the case of an equal thickness slab, other synthetic slabs one of two beds of contiguous on a common beam, the present invention said other synthetic slab as claimed in claim 5 By constructing using a deck plate, the slab thickness of the entire two floors is more than the slab thickness of the entire two floors when constructing a composite slab using a deck plate for a composite floor slab having a trapezoidal corrugated cross section. Can be thinned.
That is, the two floors on both sides of the continuous beam on the beam usually have the same floor surface height position, so if the other composite slab is a composite slab using a trapezoidal corrugated cross-section deck plate, It is necessary to apply the one equal thickness slab to an extra thickness in accordance with the slab thickness of the composite slab. However, since the slab thickness can be reduced by making the other synthetic slab as the synthetic slab of claim 4 , it is not necessary to construct the one equal-thick slab excessively thick, and therefore, both sides of the beam The slab thickness of the entire two floors can be made thinner than the slab thickness of the entire two floors when the synthetic slab is constructed using the deck plate for the synthetic floor slab having a trapezoidal corrugated cross section. Thereby, the floor height can be lowered, the construction cost can be reduced, and the cost of the entire building can be greatly reduced.

If the narrowed portion of the reinforcing rib is a closed narrowed portion with no gap by caulking, welding or the like as in claim 3 , it is preferable that the gap of the narrowed portion does not widen due to the weight of the concrete.

1 shows a deck plate according to an embodiment of the present invention, in which (a) is a plan view near the end of the deck plate, (b) is a cross-sectional view taken along line AA in (b), and (c) is B in (a). It is -B sectional drawing. FIG. 2 is a side view of a state in which the deck plate of FIG. 1 is spanned between beams. (A) is an enlarged view of the vicinity of the crushing end of FIG. 2, (b) is a cross-sectional view taken along the line CC in (a), (c) is a cross-sectional view taken along the line DD in (a), and (d) is It is the figure which expanded (c). It is a perspective view of the said deck plate. It is the figure which expanded the principal part of FIG. It is explanatory drawing of the process of crushing the edge part of the reinforcement rib in the said deck plate from the width direction, and forming a crushing edge part. It is a figure explaining the cross-sectional gradually change area | region length from the crushing edge part to the reinforcement rib which is not crushed in this invention, (b) is a figure of the principal part of the deck plate of FIG. ) Is a plan view of the main part of the conventional deck plate shown in FIG. (A) is principal part sectional drawing which shows one Example of the floor structure of this invention, (b) is sectional drawing of the floor structure shown in order to demonstrate the effect of the floor structure of (b). It is a figure (corresponding to FIG. 3) which shows the other Example of this invention, (A) is the figure which expanded the vicinity of the crushing edge part of a deck plate, (B) is C'-C 'of (A). Sectional drawing (c) is a sectional view taken along line D'-D 'in (a). It is a figure (corresponding to Drawing 3) which shows other examples of the present invention, (A) is the figure which expanded the neighborhood of the crushing edge part of a deck plate, (B) is C ''-C of (A). "Cross-sectional view, (c) is D" -D "cross-sectional view of (a). Describe the deck plate that is not crushed at the end of the deck plate length direction. (A) is a plan view near the end of the deck plate, (b) is a cross-sectional view taken along line EE of (a). is there The conventional deck plate will be described. (A) is a side view of the deck plate spanned between the beams, (b) is an enlarged cross-sectional view of FF of (b), and (c) is of (b). It is GG expanded sectional drawing except a beam. Other conventional deck plates will be described. (A) is a side view of the deck plate spanned between beams, (b) is an enlarged cross-sectional view of (b) HH, (c) is (b) It is an II expanded sectional view except a beam.

  Hereinafter, embodiments for carrying out the deck plate and floor structure of the present invention will be described with reference to the drawings.

  1A and 1B illustrate a deck plate 1 according to an embodiment. FIG. 1A is a plan view of the vicinity of an end of the deck plate, FIG. 1B is a cross-sectional view taken along the line A-A in FIG. It is BB sectional drawing of. FIG. 2 is a side view of the deck plate 1 of FIG. 3 (a) is an enlarged view of the vicinity of the crushing end portion of FIG. 2, (b) is a cross-sectional view taken along the line CC of (a), (c) is a cross-sectional view taken along the line DD of FIG. ) Is an enlarged view of (c). 4 is a perspective view of the vicinity of the end of the deck plate 1, and FIG. 5 is an enlarged view of a part of FIG.

This deck plate 1 is used, for example, as a formwork for placing concrete by spanning between beams when building a floor slab or roof slab of a steel frame, reinforced concrete structure, or steel reinforced concrete structure. Generally, it is manufactured by roll forming using a thin steel plate of about 0.8 mm to 1.6 mm.
The deck plate 1 in the illustrated example is the same as the deck plate described in FIG. 11 except for the end portion in the length direction. The deck plate 1 and two pieces in the illustrated example from the substrate unit 2 to the substrate unit 2 side are illustrated. Provided with a plurality of reinforcing ribs 3 projecting in a cross-sectional shape having an overlapped portion (constricted portion) 3a and having a huge portion 3b forming a space 3c on the distal end side, It has the short flat part 2a, and has the latching piece 2b bent in the L shape at the other edge part.

The deck plate of the present invention has crushing end portions 4 that crush the reinforcing ribs 3 from both sides in the deck plate width direction and close the enormous portion 3b at both ends in the deck plate length direction.
The crushing end portion 4 in the illustrated example has a deck plate width in such a manner that the flat portion (the enormous portion plate material) at the front end portion of the enormous portion is folded inward as shown in FIG. It is formed by being crushed from both directions.
FIG. 6 schematically shows a process of forming the crushing end portion 4. FIG. 6 (a) shows an original triangular cross-sectional shape in which the enormous portion 3b of the reinforcing rib 3 is not deformed. The center of the flat part S of the triangular side 3b is pushed into the substrate part 2 side as shown in the same figure (b) to be recessed or supported so as not to swell, and then the enormous part as shown in the figure (c) By crushing 3b from both sides with a metal mold, the flat portion S is folded into a two-layered state without a gap as shown in FIG. This end crushing process can be performed using an appropriate mold. In (b) to (d), the enormous portion 3b that is not deformed is indicated by a broken line.

In the end processing that crushes the reinforcing ribs from above as in the conventional case, since it is folded in a complicated manner and crushed, it is difficult to always obtain a constant crushing end shape, and it does not have a clean appearance, but in FIG. As shown, in the end processing that crushes from both sides of the deck plate width direction, a constant crushing end shape is always obtained, and a clean appearance is obtained.
In addition, compared to the conventional process of crushing the entire reinforcing rib from above, in the process of crushing from both sides of the deck plate width direction of the present invention, there is no deformation of the two-layer overlapped portion, and only a huge portion of the crushing process is required. Less force is required for processing.

As shown in FIGS. 2 and 3, the deck plate 1 is stretched between the beams 5 as a discarded formwork at the time of placing a concrete floor. To build a floor slab.
According to this deck plate 1, both end portions in the deck plate length direction of the enormous portion 3 b of the reinforcing rib 3 are crushed from both sides in the deck plate width direction to form closed crushing end portions 4. Thus, even if the reinforcing rib 3 is laid upward and the concrete is placed, the concrete does not enter the enormous portion 3b of the reinforcing rib 3 at the end portion in the deck plate length direction.
Accordingly, it is possible to prevent the amount of the concrete from being used more than designed and to prevent an increase in cost due to an increase in the amount of concrete. In addition, since the construction is performed with the concrete amount as designed, the floor weight does not increase beyond the design weight, and there is no possibility of exceeding the allowable stress at the time of design.

  Further, as compared with the conventional crushing end portion 4 ′ formed by crushing from above, the cross-sectional performance is substantially reduced as compared with the case where the cross-sectional performance is substantially reduced as in the embodiment. Since the crushing end portion 4 formed by crushing to the shape maintains the cross-sectional height, the cross-sectional performance is large. However, it is slightly lower than the reinforcing ribs that are not crushed.

  The floor structure constructed using this deck plate 1 has a concrete synthesis effect in which the reinforced rib 3 is on the upper side, so that the huge portion 3b of the reinforcing rib 3 is integrally coupled with the concrete cast. In particular, the surface of the enormous portion 3b toward the substrate portion 2 is engaged with the cast concrete, and the effect of combining the deck plate and the concrete is obtained. Therefore, the deck plate is not limited to a simple formwork, but functions as a structural member after the concrete is hardened, so that a so-called synthetic slab can be constructed. In addition, since it becomes a synthetic | combination slab, it is also possible to abbreviate | omit a structural reinforcement, but it is good also to arrange | position a structural reinforcement as needed.

FIG. 7 is a diagram for explaining the distance from the crushing end to the reinforcing rib that is not crushed in the present invention, that is, the cross-sectional gradual change region length. (A) is a plan view of (b), and (c) is a diagram of the main part of the conventional deck plate shown in FIG. 13 (a).
For example, in the case of a deck plate having a plate thickness of 1.0 mm, a height of the reinforcing rib 3 of 75 mm, a width of the huge portion 3b of 40 mm, and a length of the two-layer overlapping portion 3a of approximately 40 mm, the crushing end portion of the embodiment 4 can be formed even if the cross-sectional gradual change area length L when forming 4 is shortened to 50 mm, whereas the cross-sectional gradual change area in the case of conventional end processing that is crushed from above The length L ′ usually requires about 200 mm (note that the lengths of the crushing end portions 4 and 4 ′ are the same).
As described above, the cross-sectional gradual change region L in the case of end processing that crushes from the width direction of the present invention is significantly shorter than the cross-sectional gradual change region L ′ in the case of end processing that crushes from above. That's it. Therefore, it is possible to shorten the region of the deformed portion (crushed end portion + cross-sectional gradual change region) having a low concrete synthesis effect.

Table 1 compares the cross-sectional secondary moment and the adhesion area to the concrete (indicated by the length in the width direction) for the conventional and three types of end cross-sectional shapes of the present invention. The calculation is made with a plate thickness of 1 mm, a height of the reinforcing ribs of 75 mm, a width of 40 mm, and one span (reinforcing rib interval) of 210 mm.
<1> is a cross-sectional shape of an end portion where the conventional crushing is not performed (referred to as a non-enclosure cross-section), and <2> is a cross-sectional shape of the crushing end portion 4 of the present invention formed by crushing in the horizontal direction (temporarily vertical) <3> is a cross-sectional shape of a conventional crushing end 4 'formed by crushing from above (referred to as a horizontal encro-cross section). In addition, the large adhesion area with respect to concrete contributes to the binding force with respect to concrete.
As shown in Table 1, the cross-section secondary moment and the adhesion area are the largest in the case of the non-enclosure cross section. While the vertical encro-section 4 of the present invention is greatly reduced to 1% and the adhesion area of 54%, the cross-sectional secondary moment is 83% and the adhesion area is 90% with respect to the non-enclosure cross section. The degree of is slight.

FIG. 8 is a diagram for explaining a case where one of two floors continuous on the common beam 5 is constructed as an equal thickness slab 21 and the other as a composite slab.
One equal thickness slab 21 in the illustrated example is an equal thickness slab constructed by using the deck plate 1 ′ as a mere discarded mold frame whose entire upper surface is a flat surface as shown in FIG. Place vertical and horizontal reinforcing bars in the same way as reinforced concrete floors.
The composite slab is a slab in which the laid deck plate functions as a mold when the concrete is placed, and after the concrete is hardened, it is integrated with the concrete and bears a load. The composite slab 22 in FIG. This is a synthetic slab constructed by laying between beams as shown in FIG. 2 and using concrete as a synthetic deck.
In the synthetic slab 23 in FIG. 8 (b), the horizontal crest surface 11a and the trough surface 11b continuously form a trapezoidal corrugated cross-sectional shape on the inclined surface 11c, and further, a step portion 11d that engages with the concrete is formed on the inclined surface 11c. This is a synthetic slab constructed using a deck plate 11 for a synthetic floor slab.

Since the synthetic slab 23 of FIG. 8B cannot effectively use the entire thickness direction of the concrete in the valley as a structural member in terms of structural design, the slab thickness t ′ becomes thick.
On the other hand, when the synthetic slab 22 in FIG. 8 (a) is constructed with a concrete volume that has a cross-sectional performance equivalent to that of a synthetic slab using a deck plate for a synthetic floor slab having a trapezoidal corrugated cross-sectional shape, Since there is no concrete portion that cannot be used effectively as a member, the slab thickness t can be reduced as compared with the synthetic slab using the synthetic slab deck plate having the trapezoidal corrugated cross section.

By the way, as shown in FIG. 8 (a), two floors on both sides of the beam that are continuous on the beam 5 usually have the same floor surface height position. Therefore, the other composite slab is formed as shown in FIG. Thus, in the case of the synthetic slab 23 constructed using the deck plate 11 having the trapezoidal corrugated cross-sectional shape, the one equal thickness according to the slab thickness t ′ of the synthetic slab 23 in order to make the floor surface height position the same. It is necessary to increase the slab thickness of the slab 21 excessively (necessary to set t to t ′).
However, if the other synthetic slab is a synthetic slab 22 constructed using the deck plate 1 of the present invention as shown in FIG. 8 (A), the slab thickness does not need to be increased excessively, and the original slab thickness is increased. You can keep t.
Therefore, the slab thicknesses of the entire two floors 21 and 22 on both sides of the beams to be constructed with the same thickness are set to be the same as that of the entire two floors when the composite slab is constructed using the deck plate for the composite floor slab having the trapezoidal corrugated cross section. It can be made thinner than the slab thickness t ′. Thereby, the floor height can be lowered, the construction cost can be reduced, and the cost of the entire building can be greatly reduced.

  FIG. 9 shows a deck plate 1A according to another embodiment of the present invention. The crushing end portion 4A of the deck plate 1A is formed in such a manner that the enormous portion plate material at the end portion of the enormous portion further extends in the distal end direction, and is in a state where it is in a simple linear two-layered state as shown in FIG. It is formed by being crushed from both sides in the plate width direction.

FIG. 10 shows a deck plate 1B according to still another embodiment of the present invention. This deck plate 1B is a case where the two-layer overlapping portion (squeezed portion) 3a ′ of the reinforcing rib 3 ′ is elongated as shown in FIG. A lateral projecting portion 3d ′ projecting left and right is provided. This lateral protrusion 3d ′ has the effect of increasing the buckling strength of the two-layer overlapping portion 3a ′ and increasing the composite effect of the deck plate 1B and the concrete when placing concrete.
The enormous portion 3b ′ on the tip side of the reinforcing rib 3 ′ has the same cross-sectional shape as the enormous portion 3b shown in FIG. 3B, and forms a space 3c ′ in a substantially triangular shape.
Further, the squeezed enormous portion of the crushing end 4B in the deck plate 1B is the same as the squeezing end 4 shown in FIG. The enormous part plate material) is formed by being crushed from both sides in the deck plate width direction in a manner of being folded inward.

In each of the above embodiments, the narrowed portion connected to the substrate portion 2 of the reinforcing rib 3 is the two-sheet overlapping portion 3a in which two plate materials are overlapped, but the length (height) of the two-sheet overlapping portion 3a is not particularly limited. . Furthermore, the substantially triangular bulge part 3b may be formed directly from the substrate part 2, and the substantially triangular apex part of the bulge part 3b may have a cross-sectional shape that becomes a constricted part.
Further, the shape of the enormous portion forming the space is not limited to a substantially triangular shape.
Moreover, although the board | substrate part 2 is made into the flat form in the Example, it is not limited to flat form, for example, a thing with an unevenness | corrugation in the surface.

1, 1A, 1B Deck plate 2 Substrate part 3, 3 'Reinforcement ribs 3a, 3a' Two-layer overlapping part (constriction part)
3b, 3b 'Enlarged part 3c, 3c' Space 3d 'Lateral projecting part 4, 4A, 4B Crushing end part 5 Beam 21 Equal thickness slab 22 (Deck plate of the present invention) Synthetic slab 23 (Deck with trapezoidal corrugated cross section) Composite slab L (depending on the plate) Sectional change region length

Claims (5)

A deck plate having a plurality of reinforcing ribs protruding in a cross-sectional shape having a substrate portion and a narrowed portion on the substrate portion side and a huge portion on the tip side from the substrate portion,
The crushing end portion that crushes the reinforcing ribs from both sides in the deck plate width direction in a manner in which the bulging portion plate material of the bulging portion tip side portion is folded inward at both ends in the deck plate length direction to close the bulging portion. A deck plate characterized by comprising: A deck plate having a plurality of reinforcing ribs protruding in a cross-sectional shape having a substrate portion and a narrowed portion on the substrate portion side and a huge portion on the tip side from the substrate portion,
The reinforcing ribs are squeezed from both sides in the deck plate width direction in such a manner that the bulging part plate material of the bulging part tip side part further extends in the tip direction and is in a stacked state at both ends of the deck plate length direction. A deck plate having a closed crushing end. The squeezed portion of the reinforcing rib is a closed squeezed portion without a gap, and the deck plate length direction both ends of the enormous portion of the reinforcing rib are crushed from both sides of the deck plate width direction, thereby the deck plate The deck plate according to claim 1 or 2, wherein a closed space is formed inside the reinforcing rib as a whole. A floor structure comprising: a plurality of deck plates according to any one of claims 1 to 3 , spanning between beams with the reinforcing ribs facing upward, and concrete placed thereon. One of the two floors on the common beam is an equal thickness slab, the other is a composite slab,
The equal thickness slab is a slab constructed by placing concrete using a formwork whose entire upper surface is a flat surface,
The synthetic slab is a slab constructed by casting concrete using a deck plate having a projection integrally bonded to the concrete after the concrete is hardened to the concrete to be placed,
The synthetic slab is constructed by placing concrete using the deck plate according to any one of claims 1 to 3 as a formwork, and the upper surface height position is the same as the equal thickness slab. Characteristic floor structure.

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