Deck plate, and deck plate installation structure

Abstract

To provide deck plates and deck plate installation structures which can reduce cost while reducing the floor height.SOLUTION: A first deck plate 6A can reduce the floor height by connecting an end part 21 with an inverted end-closing shape 22 to a girder 2 making the level of the bottom edge of the first deck plate 6A lower than the top edge of the girder 2. The first deck plate 6A has the inverted end-closing shape 22 at only one side end part 21 in the span direction D1. Thus, common metal molds 60A, 70A can form two of the first deck plates 6A1, 6A2, enabling the "first" first deck plate 6A1 to be connected to one girder 21 and the "second" first deck plate 6A2 to be connected to the other girder 22. This enables reducing the manufacturing cost of the metal mold for forming the inverted end-closing shape 22 and reducing the fixed cost of the rearrangement works for the metal mold during the deck plate fabrication.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a deck plate and a deck plate installation structure. [Background technology]

[0002] A conventional deck slab is known from Patent Document 1. This deck slab is equipped with a reverse end-closed deck plate in order to lower the floor height without increasing the construction work. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-40746 A Summary of the Invention [Problem to be solved by the invention]

[0004] As mentioned above, when using a reverse end-closed deck plate, the floor height can be lowered by lowering the bottom end of the floor below the top end of the girder. Here, deck plates are generally laid out while fitting the fitting parts provided at the ends in the width direction, so as shown in Figure 7, the fitting parts have different shapes on the male and female sides, resulting in an asymmetric structure. Therefore, when viewed from the mold that forms the reverse end-closed shape at the end of the deck plate, the positional relationship between the male and female fitting parts on one end side and the male and female fitting parts on the other end side is not the same. Therefore, it is necessary to prepare a mold dedicated to the reverse end-closed shape on one end of the deck plate and a mold dedicated to the reverse end-closed shape on the other end side. This causes problems such as double the mold manufacturing cost and fixed costs for mold reassembly work when manufacturing deck plates.

[0005] The present invention has been made to solve such problems, and aims to provide a deck plate and a deck plate installation structure that can reduce costs while lowering the floor height. [Means for solving the problem]

[0006] The deck plate of the present invention has a first fitting portion provided at one end in the width direction, and a second fitting portion provided at the other end in the width direction and having a shape different from the first fitting portion, and the deck plate can be connected to an adjacent deck plate by fitting one of the first fitting portion and the second fitting portion into the other fitting portion of another deck plate adjacent in the width direction, and has a reverse end closed shape at only one end in the span direction.

[0007] The deck plate according to the present invention has an inverted end-closed shape at its end. Therefore, by joining the end of the deck plate having the inverted end-closed shape to the beam, the lower end of the deck plate can be lowered below the upper end of the beam, thereby lowering the floor height. Here, the deck plate has a first fitting portion provided at one end in the width direction and a second fitting portion provided at the other end in the width direction and having a shape different from that of the first fitting portion. If the deck plate has an inverted end-closed shape at both ends in the span direction, as described above, it is necessary to prepare a mold dedicated to the inverted end-closed shape at one end of the deck plate and a mold dedicated to the inverted end-closed shape at the other end. In contrast, the deck plate according to the present invention has an inverted end-closed shape only at one end in the span direction. Therefore, it is possible to mold two deck plates using a common mold, join the first deck plate to one beam, and join the second deck plate to the other beam. In this case, it is possible to reduce the cost of manufacturing the mold for forming the reverse end-closed shape and the fixed cost of changing the mold when manufacturing the deck plate. As a result, it is possible to reduce costs while lowering the floor height.

[0008] The deck plate laying structure of the present invention is a deck plate laying structure comprising a pair of beams facing each other in the span direction and a plurality of deck plates arranged between the pair of beams, in which the above-mentioned deck plate is used as the deck plate to be joined to the beam among the plurality of deck plates, and the end portion having an inverted end closed shape is joined to the beam.

[0009] In addition, the deck plate laying structure of the present invention is a deck plate laying structure comprising a pair of beams facing each other in the span direction and two deck plates arranged between the pair of beams, in which the above-mentioned deck plates are used as the two deck plates, and the ends having an inverted end-closed shape are joined to the beams.

[0010] According to the deck plate installation structure of the present invention, the floor height can be lowered by joining the end having the inverted end-closed shape to the beam. Also, the deck plate has the inverted end-closed shape only at one end in the span direction. Therefore, multiple deck plates can be formed using a common mold and joined to multiple beams, respectively. Therefore, the floor height can be lowered while reducing costs.

[0011] The beam may be a girder. In this case, by connecting the end of the inverted end-closed shape to the girder, the entire floor structure between the girder can be lowered.

[0012] The end opposite to the end having the inverted end-closed shape may be connected to a small beam. In this case, the floor height of the opposite end can be supported while being lowered.

[0013] The beam is a main girder, and the difference in vertical height between the main girder and the upper flange of the secondary girder may be "ab", where "a = deck plate height" and "deck plate thickness ≦ b ≦ 10mm". In this case, the floor height reduction effect can be achieved while ensuring the transport efficiency of the deck plate. Effect of the Invention

[0014] According to the present invention, it is possible to provide a deck plate and a deck plate installation structure that can reduce costs while lowering the floor height. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic cross-sectional view of a deck plate according to an embodiment of the present invention and a deck slab in which a deck plate laying structure is adopted, as viewed from the width direction. [Diagram 2] FIG. 2 is a plan view of a deck slab. [Diagram 3] FIG. 2 is an enlarged cross-sectional view of the deck slab as viewed from the width direction. [Figure 4] 4 is a cross-sectional view taken along lines IVa-IVa, IVb-IVb, and IVc-IVc shown in FIG. 3 as viewed in the span direction of the deck slab. [Diagram 5] 13A is a perspective view of the reverse end-closed shape seen from below, FIG. 13B is a perspective view of the open shape 24 seen from above, and FIG. 13C is a perspective view of the normal end-closed shape seen from above. [Figure 6] FIG. 1 is a plan view showing a deck plate laid between girders. [Figure 7] FIG. 4 is a cross-sectional view showing the fitting structure of the front first deck plate when viewed from the span direction. [Figure 8] FIG. 11 is a cross-sectional view showing the fitting structure of the rear first deck plate as viewed from the span direction. [Figure 9] 1 is a schematic cross-sectional view showing a deck plate installation structure using a deck plate according to a comparative example. FIG. [Figure 10] FIG. 11 is a perspective view showing a mold for molding a deck plate according to a comparative example. [Figure 11] FIG. 2 is a perspective view showing a mold for molding the deck plate according to the embodiment. [Figure 12] A schematic cross-sectional view showing a deck plate installation structure using a deck plate according to a modified example. [Figure 13]13 is a cross-sectional view of a deck plate fitting structure according to a modified example, as viewed from the span direction. FIG. [Figure 14] 10 is a schematic cross-sectional view for explaining the relationship between the difference in vertical height between the upper flanges of the main beam and the secondary beam. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[0017] FIG. 1 is a schematic cross-sectional view of a deck slab 100 employing a deck plate 6 and a deck plate laying structure 200 according to an embodiment of the present invention, as viewed from the width direction D2. FIG. 2 is a plan view of the deck slab 100. However, concrete 7 is omitted in FIG. 2. As shown in FIG. 1, the deck slab 100 is provided as a floor slab in a building. Both ends of the deck slab 100 are supported by a pair of girders 2. Also, a plurality of small beams 3 (five in this example) are provided midway between the pair of girders 2. The deck slab 100 has a deck plate 6 and concrete 7 provided on the deck plate 6.

[0018] Here, the span direction D1 and width direction D2 of the deck plate 6 will be explained. The direction in which the peaks 6a and valleys 6b of the deck plate 6 extend is the span direction D1 of the deck plate 6, and the direction in which the peaks 6a and valleys 6b are aligned is the width direction D2 of the deck plate 6. In the following explanation, when simply referring to the "span direction" and "width direction", this refers to the span direction D1 and width direction D2 of the deck plate 6. In FIG. 1, the main beams 2 and the secondary beams 3 extend parallel to the width direction D2. Furthermore, the main beams 2 and the secondary beams 3 are arranged spaced apart from each other in the span direction D1.

[0019] Fig. 3 is an enlarged cross-sectional view of the deck slab 100 as viewed from the width direction D2. Figs. 4(a), 4(b), and 4(c) are cross-sectional views taken along lines IVa-IVa, IVb-IVb, and IVc-IVc shown in Fig. 3.

[0020] As shown in Figures 4(a) and (b), the deck plate 6 has alternating peaks 6a and valleys 6b in the width direction D2. The peaks 6a are provided so as to protrude upward from the bottom surfaces of the valleys 6b. The multiple peaks 6a extend parallel to each other in the span direction D1 while being spaced apart from each other in the width direction D2. The peaks 6a form both side walls of the valleys 6b.

[0021] The concrete 7 is poured onto the deck plate 6. The concrete 7 is filled inside the valleys 6b of the deck plate 6 up to a position higher than the upper surfaces of the peaks 6a. As a result, the concrete 7 has an upper surface that extends in the span direction D1 and width direction D2 above the deck plate 6. This upper surface becomes the upper surface 100a of the deck slab 100. The thickness t of the concrete 7 on the peaks 6a of the deck plate 6 is 50 mm to 100 mm.

[0022] As shown in FIG. 1, the deck slab 100 according to this embodiment has a pair of first deck plates 6A and a second deck plate 6B. The pair of first deck plates 6A are arranged to be spaced apart from each other in the span direction D1, and are deck plates 6 joined to a pair of girders 2, respectively. The second deck plate 6B is a deck plate 6 arranged between the pair of first deck plates 6A in the span direction D1. In this embodiment, the deck slab 100 has two second deck plates 6B, but the number is not particularly limited. Both ends of the first deck plate 6A in the span direction D1 are joined to the girder 2 and the small beam 3 adjacent to the girder 2, respectively. Both ends of the second deck plate 6B in the span direction D1 are joined to the small beam 3 arranged between the girders 2. When supported between the second deck plates 6B in the span direction D1, they are supported by the small beam 3.

[0023] Next, the first deck plate 6A and the second deck plate 6B will be described in detail with reference to FIG. 3 and FIG. 4. As shown in FIG. 3, the first deck plate 6A has an inverted end-closed shape 22 only at one end 21 in the span direction D1 that is joined to the main girder 2. The other end 23 in the span direction D1 of the first deck plate 6A is joined to the sub-girder 3. In this embodiment, the other end 23 of the first deck plate 6A has an open shape 24. Between the end 21 and the end 23, the portion shown in FIG. 4(a) is configured as a general portion 11 that extends in the span direction D1 with the cross-sectional shapes of the peaks 6a and the valleys 6b being constant. The portion shown in FIG. 4(b) is not included in the general portion 11 because the cross-sectional shapes of the peaks 6a and the valleys 6b are not constant. The portion shown in FIG. 4(c) is not included in the general portion 11 because it does not have the peaks 6a and the valleys 6b. The second deck plate 6B has a normal end-closed shape 33 at both ends 31, 32 in the span direction D1. The both ends 31, 32 of the second deck plate 6B in the span direction D1 are joined to the small beams 3. The portion between the end 31 and the end 32 is configured as a general portion 11.

[0024] The shape of the end of the deck plate 6 will be described with reference to FIG. 5. FIG. 5(a) is a perspective view of the inverted end-closed shape 22 seen from below. The deck plate 6 has an upper flange 26 that forms the upper surface of the peak 6a and extends horizontally. The upper flange 26 has a flat joint 28 that extends from the tip of the peak 6a of the deck plate 6 to the girder 2 side. The joint 28 is placed on and fixed to the upper surface of the girder 2. The deck plate 6 has a lower flange 27 that forms the lower surface of the valley 6b and extends horizontally. The deck plate 6 has a side wall 29 that extends upward from the end of the lower flange 27 in the width direction D2 and is connected to the end of the upper flange 26 in the width direction D2. The pair of side walls 29 and the tip side of the lower flange 27 in the span direction D1 are closed by an inclined portion 30. The inclined portion 30 inclines upward as it approaches the tip side. The inclined portion 30 extends to the joint 28 of the upper flange 26.

[0025] 5(b) is a perspective view of the open shape 24 seen from above. The open shape 24 is a shape that opens at the tip in the span direction D1 while the cross-sectional shape of the general portion 11 is maintained at the tip. In the open shape 24, the tip of the side wall 29 is perpendicular to the horizontal direction.

[0026] 5(c) is a perspective view of the normal end-closed shape 33 as viewed from above. The lower flange 27 has a flat joint 34 that extends from the tip of the valley portion 6b of the deck plate 6 toward the minor beam 3. The joint 34 is placed on and fixed to the upper surface of the minor beam 3. The tip sides of the pair of side walls 29 and the upper flange 26 in the span direction D1 are closed by an inclined portion 36. The inclined portion 36 inclines downward as it approaches the tip side. The inclined portion 36 extends to the joint 34 of the lower flange 27.

[0027] As described above, the end 21 of the first deck plate 6A has an inverted end-closed shape 22. As a result, as shown in Fig. 3, the thickness of the concrete 7 at the location supported by the girders 2 is thinner than the thickness of the concrete in the general portion 11. The thickness of the concrete in the open shape 24 and the normal end-closed shape 33 is equal to the thickness of the concrete 7 in the general portion 11.

[0028] As shown in FIG. 4(a), the thickness of the concrete 7 in the general portion 11 is "t1". As shown in FIG. 4(b), the valley portion 6b in the inverted closed end shape 22 is disposed at a higher position than the valley portion 6b of the general portion 11. As a result, the thickness of the concrete 7 in the inverted closed end shape 22 is thinner than the thickness t1 of the concrete 7 in the general portion 11. As shown in FIG. 4(c), the joint portion 28 is disposed at a higher position than the valley portion 6b (see FIG. 4(a)) of the general portion 11. In this embodiment, the joint portion 28 is disposed at the same height as the peak portion 6a of the general portion 11. As a result, the thickness t2 of the concrete 7 in the joint portion 28 is thinner than the thickness t1 of the concrete 7 in the general portion 11.

[0029] As shown in FIG. 3, the concrete 7 has fire-resistant reinforcement 9 in the area corresponding to the first deck plate 6A. The fire-resistant reinforcement 9 is a reinforcing bar extending in the span direction D1. The fire-resistant reinforcement 9 extends in the span direction D1 so as to reach directly above the sub-beam 3. The end of the fire-resistant reinforcement 9 on the end side 21 is disposed at the end of the general portion 11 on the end side 21. The fire-resistant reinforcement 9 is disposed at a position lower than the peak portion 6a (see FIG. 4(a)). On the other hand, the concrete 7 does not have fire-resistant reinforcement 9 in the area corresponding to the second deck plate 6B. That is, the fire-resistant reinforcement 9 is not disposed above the second deck plate 6B.

[0030] Next, referring to Fig. 6, the deck plate installation structure 200 and the first deck plate 6A will be described in more detail. Fig. 6 is a plan view showing the deck plates 6A, 6B laid between the girders 2. In the following description, one side in the span direction D1 will be referred to as the "front" and the other side as the "rear". Also, the direction as viewed from the front side will be used as the reference, and one side in the width direction D2 will be referred to as the "right" and the other side as the "left". However, these directions are set for the sake of convenience in the description.

[0031] As shown in FIG. 6, a plurality of (three in this example) first deck plates 6A are arranged in the width direction between each beam. Among the girders 2, the front girder 2 is referred to as the "girder 21" and the rear girder 2 is referred to as the "girder 22". The first deck plate 6A joined to the front girder 21 is referred to as the "first deck plate 6A1", and the first deck plate 6A joined to the rear girder 22 is referred to as the "first deck plate 6A2". The front first deck plate 6A1 is joined to the front girder 21 so that the end 21 having the inverted end-closed shape 22 is arranged on the front side. The rear first deck plate 6A2 is joined to the rear girder 22 so that the end 21 having the inverted end-closed shape 22 is arranged on the rear side.

[0032] As shown in Fig. 6, the deck plate laying structure 200 comprises a pair of girders 2 facing each other in the span direction D1, and a plurality of deck plates 6 arranged between the pair of girders 2. Of the plurality of deck plates 6, the above-mentioned first deck plates 6A1, 6A2 are used as the deck plates 6 joined to the girders 21, 22. Ends 21 having the inverted end-closed shape 22 of the first deck plates 6A1, 6A2 are joined to the girders 21, 22. Ends 23 of the first deck plates 6A1, 6A2 opposite to the end 21 having the inverted end-closed shape 22 are joined to the sub-girders 3.

[0033] The fitting structure of the front first deck plate 6A1 will be described with reference to FIG. 7. FIG. 7(a) is a cross-sectional view of one first deck plate 6A1 as viewed from the front. FIG. 7(b) is a cross-sectional view of two fitted first deck plates 6A1 as viewed from the front. As shown in FIG. 7(a), each first deck plate 6A1 has a first fitting portion 51 and a second fitting portion 52. The first fitting portion 51 is provided at an end 53 on the right side (one side) in the width direction D2. The second fitting portion 52 is provided at an end 54 on the left side (the other side) in the width direction D2, and has a different shape from the first fitting portion 51. In this embodiment, the first fitting portion 51 has a male side shape that is received in the second fitting portion 52. The second fitting portion 52 has a female side shape that receives the first fitting portion 51. The dimension of each first deck plate 6A1 in the width direction D2 is, for example, 600 mm. Each first deck plate 6A1 has two valleys 6b, one peak 6a in the center, half the peak 6a on the right side, and half the peak 6a on the left side. A first fitting portion 51 is provided on the right half of the peak 6a. A second fitting portion 52 is provided on the left half of the peak 6a.

[0034] As shown in Fig. 7(b), the first deck plate 6A1 on the left side can be connected to the other first deck plate 6A on the right side by fitting the first fitting portion 51 on the right side of the first deck plate 6A1 on the left side into the second fitting portion 52 on the left side of the other first deck plate 6A1 adjacent to the right side in the width direction D2. By fitting the first fitting portion 51 and the second fitting portion 52 together, a single ridge portion 6a is formed. The fitting structure of the second deck plate 6B may be the same as the fitting structure of the first deck plate 61.

[0035] The fitting structure of the rear first deck plate 6A2 will be described with reference to FIG. 8. FIG. 8(a) is a cross-sectional view of one first deck plate 6A2 as viewed from the front. FIG. 8(b) is a cross-sectional view of two fitted first deck plates 6A2 as viewed from the front. As shown in FIG. 8(a), in each first deck plate 6A2, the first fitting portion 51 is provided at the end 54 on the left side (one side) in the width direction D2. The second fitting portion 52 is provided at the end 53 on the right side (the other side) in the width direction D2. Also, as shown in FIG. 8(b), the left first deck plate 6A2 can be connected to the other first deck plate 6A2 on the right side by fitting the second fitting portion 52 on the right side of the left first deck plate 6A2 into the first fitting portion 51 on the left side of the other first deck plate 6A2 adjacent to the right side in the width direction D2.

[0036] With the above-mentioned configuration, as shown in Fig. 6, of the multiple first deck plates 6A1 laid on the front side, a first male fitting portion 51 is provided on the right end, and a second female fitting portion 52 is provided on the left end. Of the multiple second deck plates 6B, a first male fitting portion 51 is provided on the right end, and a second female fitting portion 52 is provided on the left end. Of the multiple first deck plates 6A2 laid on the rear side, a second female fitting portion 52 is provided on the right end, and a first male fitting portion 51 is provided on the left end.

[0037] The relationship between the peaks 6a and the valleys 6b as shown in Figures 7 and 8 is merely an example and can be changed as appropriate. For example, as shown in Figure 13, each of the first deck plates 6A1, 6A2 may have two peaks 6a and one valley 6b. The valley 6b is formed by fitting the fitting portions 51, 52 together.

[0038] Next, a manufacturing method for the first deck plates 6A1, 6A2 will be described.

[0039] First, as a comparative example, a method for manufacturing a deck plate 106 having an inverted end-closed shape 22 at both ends as shown in FIG. 9 will be described. The deck plate 106 has the inverted end-closed shape 22 at both the front end 121 and the rear end 122. FIG. 10 is a perspective view showing how the deck plate 106 according to the comparative example is molded. As shown in FIG. 10(a), the front end 121 of the deck plate 106 is press-molded with two dies, a lower die 60A and an upper die 70A, to form the inverted end-closed shape 22. A female second fitting portion 52 is formed on the left side of the deck plate 106, and a male first fitting portion 51 is formed on the right side. Note that in FIG. 10(a), the deck plate 106 is shown upside down, so that the left and right are reversed. The lower die 60A has a protrusion 61 for forming the valley portion 6b. The upper die 70A has a groove portion 71 for forming the valley portion 6b. Moreover, the upper mold 70A has a groove 72 for forming the first fitting portion 51, and a groove 73 for forming the second fitting portion 52. The female side groove 73 is provided on one side surface 70a of the upper mold 70A in the width direction D2, and the male side groove 72 is provided on the other side surface 70b. The male side first fitting portion 51 is narrower in the width direction D2 than the female side second fitting portion 52. Therefore, the groove 73 is narrower in the width direction D2 than the groove 72.

[0040] In FIG. 10(b), the inverted end-closed shape 22 is formed by press-molding the rear end 122 of the deck plate 106 with two dies, the lower die 60B and the upper die 70B. The female second fitting portion 52 is formed on the left side of the deck plate 106, and the male first fitting portion 51 is formed on the right side. The upper die 70B has a groove portion 72 for molding the first fitting portion 51, and a groove portion 73 for molding the second fitting portion 52. The male groove portion 72 is provided on one side surface 70a of the upper die 70B in the width direction D2, and the female groove portion 73 is provided on the other side surface 70b. In this way, the positions of the groove portions 72 and 73 of the upper die 70B are reversed from the positions of the groove portions 72 and 73 of the die 70A when viewed from the groove portion 71. Therefore, in order to manufacture the deck plate 106 according to the comparative example, two types of dies, that is, upper dies 70A and upper dies 70B, are required. Note that the same lower dies 60A and 60B can be used.

[0041] Figure 11 is a perspective view showing how the first deck plates 6A1, 6A2 according to this embodiment are molded. As shown in Figure 11(a), the front end 21 of the front first deck plate 6A1 is press molded with two dies, a lower die 60A and an upper die 70A, to form an inverted end-closed shape 22. A second female fitting portion 52 is formed on the left side of the first deck plate 6A1, and a first male fitting portion 51 is formed on the right side. The configuration of the dies 60A, 70A is the same as that of Figure 10(a).

[0042] Here, as shown in FIG. 11(b), the second female fitting portion 52 is formed on the right side of the rear first deck plate 6A2, and the first male fitting portion 51 is formed on the left side. When viewed from the upper mold, the second female fitting portion 52 is formed on one side surface 70a, and the first male fitting portion 51 is formed on the other side surface 70b. Therefore, the upper mold of the rear first deck plate 6A2 is provided with a female groove portion 73 on one side surface 70a in the width direction D2, and a male groove portion 72 on the other side surface 70b. In this way, the same upper mold 70A as the upper mold 70A used for the front first deck plate 6A1 can be used as the upper mold of the rear first deck plate 6A2. In this way, the reverse end-closed shape 22 is formed by press-molding the rear end portion 21 of the rear first deck plate 6A2 with two molds, the lower mold 60A and the upper mold 70A.

[0043] The relationship between the heights of the main girder 2 and the secondary girder 3 will be described with reference to Figure 14. As shown in Figure 14(a), the difference in vertical height between the upper flange 2a of the main girder 2 and the upper flange 3a of the secondary girder 3 is "Δh". In this case, "Δh = ab" may be satisfied, where "a = height of the first deck plate 6A" and "plate thickness of the first deck plate 6A ≦ b ≦ 10mm". The reason why "b" is set to 10mm or less is as follows. That is, in the "Standard Specifications for Building Construction JASS6 Steel Frame Construction", the dimensional control tolerance of the bending of the beam (both in the beam depth direction and beam width direction) is limited to an absolute value of "10mm or less".

[0044] Next, the action and effect of the first deck plate 6A and the deck plate laying structure 200 according to this embodiment will be described.

[0045] The first deck plate 6A according to this embodiment has an inverted end-closed shape 22 at the end 21. Therefore, the first deck plate 6A can lower the floor height by joining the end 21 having the inverted end-closed shape 22 to the girder 2 and dropping the lower end of the first deck plate 6A below the upper end of the girder 2. Here, the first deck plate 6A has a first fitting portion 51 provided at one end in the width direction D2 and a second fitting portion 52 provided at the other end in the width direction D2 and having a shape different from that of the first fitting portion 51. If the deck plate has the inverted end-closed shape 22 at both ends in the span direction D1, as described above, it is necessary to prepare a mold dedicated to the inverted end-closed shape at one end of the deck plate and a mold dedicated to the inverted end-closed shape at the other end (see FIG. 10). In contrast, the first deck plate 6A according to this embodiment has the inverted end-closed shape 22 only at one end 21 in the span direction D1. Therefore, it is possible to use common molds 60A, 70A to form the two first deck plates 6A1, 6A2, and join the first first deck plate 6A1 to one of the girder 21 and the second first deck plate 6A2 to the other girder 22. In this case, it is possible to reduce the cost of producing the mold for forming the inverted end closed shape 22 and to reduce the fixed cost of reassembling the mold when manufacturing the deck plates. As a result, it is possible to reduce costs while lowering the floor height.

[0046] The deck plate laying structure 200 of this embodiment comprises a pair of beams facing each other in the span direction D1 and a plurality of deck plates 6 arranged between the pair of beams, and among the plurality of deck plates 6, the above-mentioned first deck plate 6A is used as the deck plate 6 to be joined to the beam, and the end portion 21 having the inverted end closed shape 22 is joined to the beam.

[0047] According to the deck plate laying structure 200 according to the present embodiment, by joining the end portion 21 having the reverse end closure shape 22 to the beam, the floor height can be reduced. Further, the first deck plate 6 has the reverse end closure shape 22 only at one end portion 21 in the span direction D1. Therefore, a plurality of first deck plates 6A can be formed using common molds 60A and 60B and joined to the plurality of beams respectively. Accordingly, the cost can be reduced while reducing the floor height.

[0048] The beam may be the main beam 2. In this case, by joining the end portion 21 having the reverse end closure shape 22 to the main beam 2, the entire floor structure between the main beams 2 can be lowered.

[0049] The end portion 23 on the side opposite to the end portion 21 having the reverse end closure shape 22 may be joined to the secondary beam 3. In this case, it can be supported while keeping the floor height of the opposite end portion 23 low.

[0050] The beam is the main beam 2, and the vertical height difference Δh between the upper flanges 2a and 3a of the main beam 2 and the secondary beam 3 may be "a - b". However, "a = the height of the first deck plate 6A" and "the plate thickness of the first deck plate 6A ≤ b ≤ 10 mm". For example, as shown in FIG. 14(b), when the upper end of the general portion 11 exists at a position higher than the end portion 21, "Δh < a - b". In this case, the floor height reduction effect is reduced. On the other hand, as shown in FIG. 14(c), when the end portion 21 protrudes upward, "Δh > a - b". In this case, when the first deck plates 6A are stacked during transportation to the site, the protruding portion of the end portion 21 upward interferes, and the deck plates cannot be stacked horizontally, resulting in a decrease in transportation efficiency. In contrast, as shown in FIG. 14(a), when "Δh = a - b" is satisfied, the floor height reduction effect can be exerted while ensuring the transportation efficiency of the deck plates.

[0051] The present invention is not limited to the above-described embodiments.

[0052] For example, the above-mentioned deck slab structure is merely one example, and may be modified as appropriate without departing from the spirit of the present invention.

[0053] The shape of the other end 23 of the first deck plate 6A is not limited and may be a normal end-closed shape 33. The shape of the end of the second deck plate 6B is not limited and may be an open shape 24. Furthermore, the shapes of both ends of the second deck plate 6B do not have to be the same as each other and may be different. For example, one may be an open shape and the other a normal end-closed shape.

[0054] In addition, when the second deck plate 6B has a normal end-closed shape 33 at both ends, two types of molds are required for the second deck plate 6B, but at least one type of mold is required for molding the reverse end-closed shape of the first deck plate 6A, so that a cost reduction effect can be obtained. When the other end 23 of the first deck plate 6A has a normal end-closed shape 33, a mold dedicated to the normal end-closed shape is required, but it can be shared between the front first deck plate 6A1 and the rear first deck plate 6A2, so that the cost reduction effect of the present invention can be obtained. In addition, the mold used for the second deck plate 6B can be reused for the normal end-closed shape 33 for the end 23.

[0055] The number of second deck plates 6B between the main girders is not particularly limited, and may be one, or may be three or more. The number of minor girders 3 is also not particularly limited.

[0056] Also, as shown in Fig. 12, only the first deck plate 6A may be laid. That is, the deck plate laying structure 200 according to the modified example is a deck plate laying structure 200 including a pair of beams facing each other in the span direction D1 and two deck plates 6 arranged between the pair of beams, in which the above-mentioned first deck plate 6A is used as the two deck plates 6, and the end 21 having the inverted end-closed shape 22 is joined to the beams.

[0057] [Form 1] A first fitting portion provided at one end in the width direction; A deck plate having a second fitting portion provided at the other end in the width direction and having a shape different from that of the first fitting portion, The deck plate can be connected to another deck plate by fitting one of the first fitting portion and the second fitting portion into the other fitting portion of another deck plate adjacent to the deck plate in the width direction, A deck plate having an inverted end-closed shape at only one end in the span direction. [Form 2] A pair of beams facing each other in the span direction; A deck plate laying structure comprising: a plurality of deck plates arranged between the pair of beams; A deck plate laying structure in which the deck plate described in form 1 is used as the deck plate to be joined to the beam among the multiple deck plates, and the end portion having the reverse end closed shape is joined to the beam. [Form 3] A pair of beams facing each other in the span direction; A deck plate laying structure comprising two deck plates arranged between the pair of beams, A deck plate laying structure in which the deck plates described in form 1 are used as the two deck plates, and the end portions having the inverted end closed shape are joined to the beams. [Form 4] The deck plate laying structure according to claim 2 or 3, wherein the beam is a main beam. [Form 5] The deck plate installation structure according to any one of embodiments 2 to 4, wherein the end portion opposite to the end portion having the reverse end closed shape is joined to a small beam. [Form 6] The beam is a girder; A deck plate laying structure as described in embodiment 5, wherein the difference in vertical height between the upper flanges of the main girder and the secondary girder is "ab". however, a = height of the deck plate The thickness of the deck plate is ≦b≦10mm [Explanation of symbols]

[0058] 2...main girder (beam), 3...minor girder, 6A...first deck plate (deck plate), 7...concrete, 22...reverse end closed shape, 51...first fitting portion, 52...second fitting portion, 200...deck plate laying structure.

Claims

1. a first fitting portion provided at one end in a width direction; A deck plate having a second fitting portion provided at the other end in the width direction and having a shape different from that of the first fitting portion, The deck plate can be connected to another deck plate by fitting one of the first fitting portion and the second fitting portion into the other fitting portion of another deck plate adjacent to the deck plate in the width direction, A deck plate having an inverted end-closed shape at only one end in the span direction.

2. A pair of beams facing each other in the span direction; A deck plate laying structure comprising: a plurality of deck plates arranged between the pair of beams; A deck plate laying structure, in which the deck plate described in claim 1 is used as the deck plate to be joined to the beam among the multiple deck plates, and the end portion having the reverse end closed shape is joined to the beam.

3. A pair of beams facing each other in the span direction; A deck plate laying structure comprising two deck plates arranged between the pair of beams, A deck plate laying structure, in which the deck plate described in claim 1 is used as the two deck plates, and the end portion having the inverted end closed shape is joined to the beam.

4. 4. The deck plate laying structure according to claim 2 or 3, wherein the beam is a main beam.

5. The deck plate laying structure according to claim 2 or 3, wherein the end portion opposite the end portion having the reverse end closed shape is joined to a small beam.

6. The beam is a girder; The deck plate installation structure according to claim 5, wherein the difference in vertical height between the upper flanges of the main beam and the secondary beam is "a-b". however, a = height of the deck plate The thickness of the deck plate is ≦b≦10 mm

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