Deck plate

Abstract

The purpose of the present invention is to stack deck plates in a stable state.　Provided is a deck plate (10) formed from a metal plate and comprising surface parts (3) and ribs (1, 2) that are alternately continuous. When a pair of deck plates (10a, 10b) are stacked with the front and back sides reversed, bottom surfaces (13b, 23b) of the ribs (1, 2) and contact parts (3a, 3b) that are in contact with the bottom surfaces (13b, 23b) of the ribs (1, 2) at the surface parts (3) are formed in a complementary shape.

Description

[Technical Field]

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

[0002] Deck plates are widely used when constructing floor slabs, roofs, and rooftop slabs in building structures. Deck plates are installed so that they span between beams, with both ends of the deck plate fixed to the top surfaces of the beams. After the deck plate is fixed, concrete is poured on top of the deck plate, and once the concrete hardens, the floor structure, roof, or rooftop structure is constructed. Deck plates are formed by bending metal plates using roll forming or other methods. Ribs are formed on the deck plate to increase its rigidity, and protrusions that protrude toward the ribs are formed on the slab support sections formed between the ribs (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-150132 Summary of the Invention [Problem to be solved by the invention]

[0004] After being manufactured in a factory, deck plates like the ones described above are bound together with bands in batches and shipped. Because deck plates have ribs, stacking them in the same direction increases the volume, limiting the number of plates that can be stacked. Therefore, pairs of deck plates are stacked upside down, and these pairs of deck plates are bound together with bands in multiple layers (hereinafter referred to as a package). However, as shown in Figure 8, when a pair of deck plates 200, 300 are stacked, the ribs 201 of one deck plate 200 may come into contact with the grooves 302 of the other deck plate 300, and the ribs 301 of the other deck plate 300 may come into contact with the grooves 202 of one deck plate 200. In this case, the contact area between the ribs 201, 301 and the grooves 202, 302 is small, creating an unstable condition, and when the deck plates 200, 300 are tied together with the band 400, they may bend around the contact points as fulcrums. Furthermore, the overall package may become unstable, causing problems such as the package not being able to stand on its own or being prone to tipping over.

[0005] Therefore, the present invention has been made in consideration of the above-mentioned problems, and aims to provide a technology that allows deck plates to be stacked in a stable state. [Means for solving the problem]

[0006] In order to solve the above problems, one aspect of the present invention is a deck plate formed from a metal plate, in which surface portions and ribs are formed alternately and continuously, and is characterized in that when a pair of deck plates are stacked upside down, the bottom surfaces of the ribs and the contact portions of the surface portions that come into contact with the bottom surfaces of the ribs are formed in complementary shapes.

[0007] Preferably, the bottom surface of the rib and the contact portion are formed in a flat shape.

[0008] Furthermore, when the pair of deck plates are stacked upside down, it is preferable that the entire bottom surface of the rib contacts the contact portion.

[0009] Furthermore, it is preferable that the surface portion has a protrusion portion that protrudes toward one side, and that when a pair of deck plates are stacked upside down, the bottom surface of the rib that comes into contact with the protrusion portion is formed in a shape complementary to the protrusion portion.

[0010] Furthermore, when the pair of deck plates are stacked upside down, it is preferable that the entire bottom surface of the rib contacts the protrusion portion.

[0011] Furthermore, it is preferable that the surface portion has a protrusion portion that protrudes toward one side, and that when a pair of deck plates are stacked upside down in multiple layers, the protrusion portions that come into contact with each other are formed in complementary shapes.

[0012] Furthermore, when a pair of deck plates are stacked upside down in multiple stages, it is preferable that the entire area of ​​one of the protrusions contacts the other of the protrusions.

[0013] It is also preferable that the protrusion portion has a first protrusion portion that protrudes toward the surface of the surface portion on which the rib is formed, and a second protrusion portion that protrudes toward the surface of the surface portion opposite to the surface on which the rib is formed.

[0014] Furthermore, it is preferable that the pair of deck plates be stacked upside down so that the height and width in the short side direction are minimized. [Effects of the Invention]

[0015] According to one aspect of the present invention, deck plates can be stacked in a stable state. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a perspective view of a deck plate in the first embodiment. [Figure 2] 2 is a cross-sectional view taken along the line AA of the deck plate shown in FIG. 1. [Figure 3] FIG. 3 is an enlarged cross-sectional view of the protrusion portion shown in FIG. 2. [Figure 4] FIG. 2 is a cross-sectional view showing a state in which the deck plates shown in FIG. 1 are stacked. [Figure 5] FIG. 10 is a perspective view of a deck plate in a second embodiment. [Figure 6]FIG. 6 is a BB cross-sectional view of the deck plate shown in FIG. 5. [Figure 7] FIG. 6 is a cross-sectional view showing a state in which the deck plates shown in FIG. 5 are stacked. [Figure 8] FIG. 10 is a diagram illustrating a problem that occurs when conventional deck plates are stacked and tied together. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that in the following description, the drawings are schematic, and the dimensional relationships and ratios of elements may differ from the actual ones. The dimensional relationships and ratios may differ between the drawings.

[0018] [First embodiment] The configuration of a deck plate according to a first embodiment will be described with reference to Fig. 1 to Fig. 4. Fig. 1 is a perspective view of the deck plate. Fig. 2 is a cross-sectional view of the deck plate shown in Fig. 1 taken along line AA. Fig. 3 is an enlarged cross-sectional view of the protrusion shown in Fig. 2. Fig. 4 is a cross-sectional view showing the deck plates shown in Fig. 1 stacked one on top of the other. As shown in FIGS. 1 to 4, the deck plate 10 serves as a formwork for concrete that is poured when constructing a floor structure (or a roof or rooftop structure) of a building structure.

[0019] <Deck plate configuration> As shown in Fig. 1, the deck plate 10 is bridged between opposing beams. One end of the deck plate 10 is placed on one beam and fixed thereto by welding or the like, and the other end is placed on the other beam and fixed thereto by welding or the like. Specifically, the beams are made up of, for example, H-shaped steel, and each end of the deck plate 10 is placed on and fixed to the flanges of the H-shaped steel that make up the respective beams.

[0020] As shown in Figures 1 and 2, the deck plate 10 is formed from a thin steel plate that may or may not have been subjected to a surface treatment such as galvanization. The deck plate 10 is manufactured, for example, by roll-forming a flat steel plate using a roll-forming machine. The deck plate 10 is bent at multiple locations by the roll-forming machine. Here, the thickness of the deck plate 10 is preferably 0.6 to 2.3 mm. The deck plate 10 includes, for example, two ribs 1 and 2, a surface portion 3, a protruding portion 4, a locking portion 5, and an end-closed portion 6.

[0021] (rib) As shown in Fig. 2, rib 1 is formed by bending a steel plate. Rib 1 has curved portion 11 bent toward one surface of the steel plate, straight portion 12 continuing from curved portion 11 and extending in a direction perpendicular to surface portion 3, folded portion 13 continuing from straight portion 12 and curved and folded back multiple times, straight portion 14 continuing from folded portion 13 and extending in a direction parallel to straight portion 12, and curved portion 15 continuing from straight portion 14 and folded toward surface portion 3. Curved portions 11 and 15 are formed so that their bending radius R is about 3 to 10 mm, for example, about 6 mm. This is because bending by roll forming is relatively easy and because it prevents the recess formed between curved portions 11 and 15 from becoming larger than necessary, thereby wasting concrete. The straight portion 12 and the straight portion 14 are formed so that their surfaces abut against each other and are connected by caulking or the like, thereby preventing the straight portion 12 and the straight portion 14 from separating. Folded portion 13 is formed in a generally triangular cross section, and is folded back so that the start point and end point are adjacent to each other and so that straight portion 12 and straight portion 14 abut each other. Folded portion 13 is formed so that bottom surface portion 13b, which corresponds to the bottom surface of rib 1, has one flat plane.

[0022] 2, the rib 2 is formed by bending a steel plate. The rib 2 has a curved portion 21 bent toward one surface of the steel plate, a straight portion 22 continuing from the curved portion 21 and extending in a direction perpendicular to the surface portion 3, a folded portion 23 continuing from the straight portion 22 and curved and folded back multiple times, a straight portion 24 continuing from the folded portion 23 and extending in a direction parallel to the straight portion 22, an inclined portion 25 continuing from the straight portion 24 and inclining obliquely away from the straight portion 22 toward the surface portion 3, a straight portion 26 continuing from the inclined portion 25 and extending in a direction parallel to the straight portion 22, and a curved portion 27 continuing from the straight portion 26 and bent toward the surface portion 3. Curved portions 21 and 27 are formed so that their bending radius R is about 3 to 10 mm, for example, about 6 mm. This is because bending by roll forming is relatively easy and because it prevents the recess formed between curved portions 21 and 27 from becoming larger than necessary, thereby wasting concrete. The straight portion 22 and the straight portion 24 are formed so that their surfaces abut against each other, and are connected by caulking or the like, so that the straight portion 22 and the straight portion 24 do not separate. Folded portion 23 is formed in a generally triangular cross section, and is folded back so that the starting point and the end point are adjacent to each other and so that straight portion 22 and straight portion 24 abut against each other. Folded portion 23 is formed so that bottom surface portion 23b, which corresponds to the bottom surface of rib 2, has one flat surface. Bottom surface portion 23b of folded portion 23 is formed so as to be located on the same plane as bottom surface portion 13b of folded portion 13. The inclined portion 25 is intended to form a gap between the straight portion 22 and the straight portion 26, and the presence of this inclined portion 25 allows the gap formed between the straight portion 22 and the straight portion 26 to serve as a receiving portion 50 for the locking portion 5, allowing the locking portion 5 to be inserted.

[0023] The deck plate 10 is formed with, for example, two ribs, rib 1 and rib 2, which are spaced apart (center-to-center distance) by 180 to 220 mm along the width direction (short side direction) of the deck plate 10. Specifically, the deck plate 10 has a width length L of 360 to 440 mm, and rib 1 is formed so that the distance L1 from one end of the deck plate 10 in the width direction to the center of rib 1 (the center of rib 1 is the boundary surface where linear portion 12 and linear portion 14 abut) is 180 to 220 mm. Rib 2 is formed so that the distance L2 from the center of rib 1 to the center of rib 2 (the center of rib 2 is the boundary surface where linear portion 22 and linear portion 24 abut) is 180 to 220 mm. In other words, rib 1 is formed near the center of the deck plate 10 in the width direction, and rib 2 is formed near one end of the deck plate 10 in the width direction. Here, it is preferable that the distance L1 and the distance L2 are equal, and for example, they are formed so that L1=L2=200 mm and L=400 mm. The ribs 1 and 2 are formed to extend along the length (longitudinal direction) of the deck plate 10. That is, the ribs 1 and 2 are formed continuously from one end to the other end along the direction in which they span the beam 20. The ribs 1, 2 are preferably formed so that the height H from their lower ends to the upper end (upper surface) of the surface portion 3 is 50 to 150 mm, and for example, the height H is formed so that H=H=100 mm.

[0024] (face part) As shown in Figure 2, the surface portions 3 are primarily portions of the deck plate 10 where the ribs 1 and 2 are not formed, and are surfaces that primarily bear the load of poured concrete. The surface portions 3 are formed adjacent to the ribs 1 and 2 in the short direction of the deck plate 10. In other words, the ribs 1 and 2 and the surface portions 3 are formed alternately on the deck plate 10. On the deck plate 10, the surface portions 3 are formed on the same plane. As shown in FIG. 4, by bringing the rib 1 of deck plate 10a and the rib 1 of deck plate 10b as close as possible (for example, until some portion of deck plates 10a, 10b come into contact), when a pair of deck plates 10a, 10b are stacked upside down so that the height and width in the short direction are minimized, the contact portions 3a, 3b (the rib-side surfaces of surface portion 3) that come into contact with the bottom surfaces 13b, 23b of ribs 1, 2 on surface portion 3 are formed in a shape complementary to the bottom surfaces 13b, 23b of ribs 1, 2. Specifically, as shown in FIGS. 2 and 4, the bottom surfaces 13b, 23b of ribs 1, 2 are formed in a single flat plane, and therefore, the contact portions 3a, 3b are also formed in a single flat plane. The contact portions 3a, 3b are formed on the same plane as surface portion 3, i.e., they are portions where no protrusions 4 are formed. As a result, when a pair of deck plates 10a, 10b are stacked upside down so that the height and width in the short side direction are minimized, the entire bottom surfaces 13b, 23b of the ribs 1, 2 come into contact with the contact portions 3a, 3b of the surface portion 3. At this time, the surface directions of the bottom surfaces 13b, 23b of the ribs 1, 2 and the contact portions 3a, 3b of the surface portion 3 are parallel and are on approximately the same plane along the short side direction of the deck plate 10.

[0025] (projection) As shown in Fig. 2, the protrusions 4 are formed by bending a steel plate. The protrusions 4 are formed on the surface 3 so as to protrude toward the surface on which the ribs 1 and 2 are formed. As a result, the surface 3 has alternating flat portions and valley portions (peak portions when viewed from the opposite side). A plurality of protrusions 4 are formed lined up along the short side direction of the deck plate 10, for example, two protrusions 4 are formed per surface portion 3. The number of protrusions 4 depends on the width, but it is preferable to limit the number to, for example, one to five per surface portion 3. The protrusions 4 are formed to extend along the longitudinal direction of the deck plate 10. As shown in Figure 3, the protrusions 4 are preferably formed so that their width B along the short side of the deck plate 10 is 20 to 30 mm, and their height h (the length from the underside of the surface 3 to the outer surface of the part that protrudes furthest from the ribs 1 and 2) is 3 to 8 mm. The protrusions 4 are formed so that their deepest valley 41, formed in the center in the width direction, has inclined surfaces 42 with the same inclination on both sides of this valley 41 in the width direction. The protrusions 4 are preferably formed so that the bending radius R of the curved parts 43 (the boundaries with the surface 3 and the valleys) where the metal plate is curved is 3 to 6 mm.

[0026] (Latching part) The locking portion 5 is formed at one end of the deck plate 10. The locking portion 5 is an end of a steel material curved at a substantially right angle from the surface portion 3, and is formed to extend along the height direction of the ribs 1 and 2. When connecting deck plates 10, the locking portion 5 of one deck plate 10 is inserted into a receiving portion 50 formed in the rib 2 of the other deck plate 10. When connecting the deck plates 10, the deck plates 10 are overlapped so that part of the surface portion 3 of the deck plate 10 is placed on the top surface of an extension portion 8 that is formed continuous with the curved portion 27 of the rib 2 and extends along the surface portion 3, and the locking portion 5 is inserted into the receiving portion 50. The locking portion 5 may have any height as long as it can be locked into the receiving portion 50. Furthermore, provided that the poured concrete does not leak, the surfaces may be overlapped, joined by welding, or connected with fasteners such as screws without forming the locking portion 5. Also, the receiving portion 50 only needs to be able to insert the locking portion 5 into the receiving portion 50 .

[0027] (End-closed part) As shown in FIG. 1, the closed end portions 6 are formed at both ends of the deck plate 10 in the longitudinal direction (longitudinal direction). The closed end portions 6 are formed by crushing both ends of ribs 1 and 2 in a direction perpendicular to the surface of the deck plate 10. As a result, the closed end portions 6 at both ends of ribs 1 and 2 are formed with a crushed cross section, and the other parts sandwiched between the closed end portions 6 are formed with a generally triangular cross section. As a result, the both ends of ribs 1 and 2 are lower in height than the other parts, so they can be placed on the top surface of the flange portion of the beam. The closed end portions 6 are formed so that the length along the extension direction of ribs 1 and 2 is longer than the length at which they rest on the top surface of the flange portion of the beam.

[0028] <Stacking of deck plates> When the manufactured deck plate 10 is to be shipped, pairs of deck plates 10a, 10b are stacked in a plurality of layers and bound with bands to form a package. FIG. 4 is a cross-sectional view showing a pair of deck plates 10a, 10b stacked upside down so that the height and width in the short-side direction are minimized. 4, one deck plate 10a is positioned so that ribs 1 and 2 face downward, and the other deck plate 10b is positioned so that ribs 1 and 2 face upward. By bringing rib 1 of deck plate 10a and rib 1 of deck plate 10b as close as possible (for example, bringing them close enough that any part of deck plates 10a, 10b comes into contact), the pair of deck plates 10a, 10b are stacked upside down so that the height and width in the short direction are minimized. The contact portion 3a of one deck plate 10a is in surface contact with the bottom portion 23b of the rib 2 of the other deck plate 10b, and the contact portion 3b of one deck plate 10a is in surface contact with the bottom portion 13b of the rib 1 of the other deck plate 10b. The bottom surface 23b of the rib 2 of one deck plate 10a is in surface contact with the contact portion 3a of the other deck plate 10b, and the bottom surface 13b of the rib 1 of one deck plate 10a is in surface contact with the contact portion 3b of the other deck plate 10b. In the state shown in FIG. 4, the contact areas between the surface portions 3 of the pair of deck plates 10a, 10b and the ribs 1, 2 are large, and the heights are the same, resulting in a stable state.

[0029] According to the deck plate 10 described above, when a pair of deck plates 10a, 10b are stacked upside down so that the height and width in the short-side direction are minimized, the bottom surfaces of the ribs 1, 2 and the contact portions 3a, 3b on the surface portion 3 that contact the bottom surfaces of the ribs 1, 2 are formed in complementary shapes, thereby maximizing the contact area between the bottom surfaces of the ribs 1, 2 and the contact portions 3a, 3b. Furthermore, the height at each position when stacked is also the same, allowing the deck plates 10 to be stacked in a stable manner. Therefore, when a pair of deck plates 10a, 10b are stacked in multiple layers and tied with bands to form a package, the bands do not provide a fulcrum for bending the short-side ends of the deck plates 10a, 10b. This prevents the deck plates 10a, 10b from floating, suppresses bending of the deck plates 10a, 10b, and allows the product to be shipped while maintaining quality, while also ensuring the stability of the package. Furthermore, the bottom surfaces 13b, 23b of the ribs 1, 2 and the contact portions 3a, 3b are both formed in flat, complementary shapes, which increases stability when stacking a pair of deck plates 10a, 10b, and since no processing is required to form the contact portions 3a, 3b, the manufacturing process is not complicated.

[0030] [Second embodiment] The configuration of a deck plate according to a second embodiment will be described with reference to Fig. 5 to Fig. 7. Fig. 5 is a perspective view of the deck plate. Fig. 6 is a BB cross-sectional view of the deck plate shown in Fig. 5. Fig. 7 is a cross-sectional view showing the deck plates shown in Fig. 5 stacked one on top of the other. The deck plate according to the second embodiment differs from the deck plate according to the first embodiment in the configuration of the ribs and protrusions, so the following description will mainly focus on the differences, with the same reference numerals used to describe common components.

[0031] <Deck plate configuration> 5 and 6, deck plate 70 is formed from a thin steel plate that may or may not be surface-treated, such as with zinc plating. Deck plate 70 includes, for example, two ribs 1a, 2a, a surface portion 3, a protrusion portion 4, a locking portion 5, and an end-closed portion 6.

[0032] (rib) As shown in Fig. 6, rib 1a is formed by bending a steel plate. Rib 1a has curved portion 11 bent toward one surface of the steel plate, straight portion 12 continuing from curved portion 11 and extending in a direction perpendicular to surface portion 3, folded-back portion 13 continuing from straight portion 12 and curved multiple times, straight portion 14 continuing from folded-back portion 13 and extending in a direction parallel to straight portion 12, and curved portion 15 continuing from straight portion 14 and folded toward surface portion 3. The folded portion 13 is formed in a generally triangular cross section and is folded back so that the starting point and the end point are adjacent so that the straight portion 12 and the straight portion 14 abut against each other. The folded portion 13 has a bottom surface 13b, which corresponds to the bottom surface of the rib 1a, formed in a shape complementary to one of the protrusions 4. Specifically, the bottom surface 13b is formed with a recess 13c that is recessed toward the inside of the rib 1a. When a pair of deck plates 70 are stacked upside down, the first protrusion 4a (described below) fits into the recess 13c, and the bottom surface of the recess 13c and the protruding surface of the protrusion 4a come into surface contact over almost the entire area. In other words, the recess 13c and the first protrusion 4a are formed in a complementary shape.

[0033] 6, the rib 2a is formed by bending a steel plate. The rib 2a has a curved portion 21 bent toward one surface of the steel plate, a straight portion 22 continuing from the curved portion 21 and extending in a direction perpendicular to the surface portion 3, a folded portion 23 continuing from the straight portion 22 and curved and folded back multiple times, a straight portion 24 continuing from the folded portion 23 and extending in a direction parallel to the straight portion 22, an inclined portion 25 continuing from the straight portion 24 and inclining obliquely away from the straight portion 22 toward the surface portion 3, a straight portion 26 continuing from the inclined portion 25 and extending in a direction parallel to the straight portion 22, and a curved portion 27 continuing from the straight portion 26 and bent toward the surface portion 3. The folded portion 23 is formed in a generally triangular cross section and is folded back so that the starting point and the end point are adjacent and the linear portion 22 and the linear portion 24 abut against each other. The folded portion 23 has a bottom surface 23b, which corresponds to the bottom surface of the rib 2a, formed in a shape complementary to one of the protrusions 4. Specifically, the bottom surface 23b is formed with a recess 23c recessed toward the inside of the rib 2a. When a pair of deck plates 70 are stacked upside down, the first protrusion 4a fits into the recess 23c, and the bottom surface of the recess 23c and the protruding surface of the protrusion 4a come into surface contact over almost the entire area. In other words, the recess 23c and the first protrusion 4a are formed in a complementary shape. The bottom surface 23b of the folded portion 23 is formed to be located on the same plane as the bottom surface 13b of the folded portion 13.

[0034] (face part) As shown in Figure 6, the surface portions 3 are primarily portions of the deck plate 70 where the ribs 1a, 2a are not formed, and are surfaces that primarily bear the load of the poured concrete. The surface portions 3 are formed adjacent to the ribs 1a, 2a in the width direction of the deck plate 70. In other words, the ribs 1a, 2a and the surface portions 3 are formed alternately on the deck plate 70. On the deck plate 70, the surface portions 3 are formed on the same plane. 7, when a pair of deck plates 70a, 70b are stacked upside down, first protrusions 4a are formed on contact portions 3a, 3b (the rib-side surfaces of surface portion 3) that come into contact with bottom surfaces 13b, 23b of ribs 1a, 2a on surface portion 3. In other words, first protrusions 4a on surface portion 3 function as contact portions 3a, 3b.

[0035] (projection) 6, the protrusions 4 are formed by bending a steel plate. The protrusions 4 have a first protrusion 4a formed on the surface 3 so as to protrude toward the surface on which the ribs 1a and 2a are formed, and a second protrusion 4b formed so as to protrude toward the surface opposite to the surface on which the ribs 1a and 2a are formed. A plurality of protrusions 4 are formed in a line along the width direction of the deck plate 70, with, for example, three protrusions 4 formed per surface 3. Of the three protrusions 4, two are first protrusions 4a and one is a second protrusion 4b. The number of protrusions 4 depends on the width, but is preferably limited to, for example, one to five per surface 3. The protrusions 4 are formed to extend along the longitudinal direction of the deck plate 70. The second protrusion 4b may be formed to be the same size as the first protrusion 4a, but the second protrusion 4b may be formed to be slightly smaller in width and depth than the first protrusion 4a in order to fit into the first protrusion 4a. As shown in Fig. 7, the second protrusion 4b is formed in a position opposite the first protrusion 4a of one deck plate 70a that comes into contact with the other when a pair of deck plates 70 are stacked upside down in multiple layers. Specifically, as shown in Fig. 6 and Fig. 7, the first protrusion 4a and the second protrusion 4b are formed in complementary shapes, and the second protrusion 4b of one deck plate 70a, 70b fits into the first protrusion 4a of the other deck plate 70b, 70a, so that the bottom surface of the first protrusion 4a and the protruding surface of the second protrusion 4b are in surface contact over almost the entire area.

[0036] <Stacking of deck plates> When the manufactured deck plate 70 is to be shipped, pairs of deck plates 70a, 70b are stacked in multiple layers and bound with bands to form a package. FIG. 7 is a cross-sectional view showing a pair of deck plates 70a, 70b stacked upside down in two stages. 7, one deck plate 70a is positioned with its ribs 1a and 2a facing downward, and the other deck plate 70b is positioned with its ribs 1a and 2a facing upward. The pair of deck plates 70a and 70b are stacked in a positioned state by fitting the first protrusion 4a of deck plate 70a into and contacting the recesses 13c and 23c of the ribs 1a and 2a of deck plate 70b. A first protrusion 4a is formed on the contact portion 3a of one deck plate 70a, and this first protrusion 4a is in surface contact with a recess 23c formed in the bottom surface 23b of the rib 2a of the other deck plate 70b, and a first protrusion 4a is formed on the contact portion 3b of one deck plate 70a, and this first protrusion 4a is in surface contact with a recess 13c formed in the bottom surface 13b of the rib 1a of the other deck plate 70b. A first protrusion 4a is formed on the contact portion 3a of the other deck plate 70b, and this first protrusion 4a is in surface contact with a recess 23c formed on the bottom surface 23b of the rib 2a of one of the deck plates 70a, and a first protrusion 4a is formed on the contact portion 3b of the other deck plate 70b, and this first protrusion 4a is in surface contact with a recess 13c formed on the bottom surface 13b of the rib 1a of one of the deck plates 70a.

[0037] Furthermore, when a pair of deck plates 70a, 70b are stacked upside down in multiple stages (two stages in FIG. 7), the second protrusion 4b of the deck plate 70b of the upper pair of deck plates 70a, 70b is in surface contact with the first protrusion 4a of the deck plate 70a of the lower pair of deck plates 70a, 70b. Specifically, the second protrusion 4b fits into the first protrusion 4a, and the protruding surface of the second protrusion 4b is in surface contact over almost the entire area with the bottom surface of the first protrusion 4a. Additionally, the first protrusion 4a of the deck plate 70b of the pair of deck plates 70a, 70b located on the upper side is in surface contact with the second protrusion 4b of the deck plate 70a of the pair of deck plates 70a, 70b located on the lower side. Specifically, the second protrusion 4b fits into the first protrusion 4a, and the protruding surface of the second protrusion 4b is in surface contact over almost the entire area with the bottom surface of the first protrusion 4a. In the state shown in FIG. 7, the contact areas between the protruding portions 4a, 4b and the ribs 1a, 2a of the pair of deck plates 70a, 70b are large and the heights are the same, resulting in a stable state. In the second embodiment, the deck plate is provided with recesses 13c, 23c formed in the bottom surfaces 13b, 23b of the ribs 1a, 2a, and a second protrusion 4b that protrudes in the opposite direction to the first protrusion 4a so as to fit into the first protrusion 4a, but it may also be provided with only one of these components.

[0038] According to the deck plate 70 described above, when a pair of deck plates 70a, 70b are stacked upside down, the bottom surfaces of the ribs 1a, 2a and the first protrusions 4a that contact the bottom surfaces of the ribs 1a, 2a are formed in complementary shapes, thereby maximizing the contact area between the bottom surfaces of the ribs 1a, 2a and the first protrusions 4a. Furthermore, the height at each position when stacked is also the same, allowing the deck plates 70 to be stacked in a stable manner. Therefore, when a pair of deck plates 70a, 70b are stacked in multiple layers and tied with bands to form a package, the bands do not provide a fulcrum for bending the shorter edges of the deck plates 70a, 70b. This prevents the deck plates 70a, 70b from floating, suppresses bending of the deck plates 70a, 70b, and allows the product to be shipped in a quality maintained state. In addition, the bottom surfaces 13b, 23b of the ribs 1a, 2a are formed with recesses 13c, 23c that are formed in a shape complementary to the first protrusions 4a formed on the contact portions 3a, 3b with which the ribs 1a, 2a come into contact. Therefore, the first protrusions 4a fit into the recesses 13c, 23c, thereby functioning as stoppers that restrict movement of both deck plates 70a, 70b in the short direction. Furthermore, by forming recesses 13c, 23c in the bottom surface portions 13b, 23b of the ribs 1a, 2a, the ribs 1a, 2a and the surface portion 3 can be brought into surface contact with each other, allowing for stable stacking, regardless of whether or not there is a first protrusion portion 4 at the contact portion. Furthermore, the second protrusions 4b of the deck plate 70b of the upper pair of deck plates 70a, 70b are in surface contact with the first protrusions 4a of the deck plate 70a of the lower pair of deck plates 70a, 70b, and the first protrusions 4a of the deck plate 70b of the upper pair of deck plates 70a, 70b are in surface contact with the second protrusions 4b of the deck plate 70a of the lower pair of deck plates 70a, 70b. This allows the first protrusions 4a and the second protrusions 4b to fit together, functioning as stoppers that restrict movement of adjacent pairs of deck plates 70a, 70b in the short direction. Furthermore, when stacking pairs of deck plates 70a, 70b in multiple layers, positioning can be achieved simply by fitting the opposing first protrusions 4a and second protrusions 4b together, making the stacking process easier.

[0039] <Other> Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and includes all aspects encompassed within the concept and scope of the claims of the present invention. Furthermore, each configuration may be appropriately and selectively combined to achieve at least some of the above-described problems and effects. Furthermore, for example, the shape, material, arrangement, size, etc. of each component in the above embodiments may be appropriately modified depending on the specific use of the present invention. For example, the number, spacing, shape, etc. of the ribs and protrusions on the deck plate can be freely changed within the scope that allows the present invention to be realized. Furthermore, when a pair of deck plates are stacked upside down, only some of the combinations of contact portions between the bottom surfaces of the ribs and the surface portions may be formed into complementary shapes. [Explanation of symbols]

[0040] 10, 10a, 10b, 70, 70a, 70b deck plate 1,2,1a,2a Rib 3 sides 3a,3b Contact part 4 Projection part 4a First ridge 4b Second ridge 13b,23b Bottom part 13c, 23c recess

Claims

1. A deck plate made of a metal plate, in which surface portions and ribs are formed alternately and continuously, When the pair of deck plates are stacked upside down, the bottom surface of the rib and the contact portion of the surface portion that comes into contact with the bottom surface of the rib are formed in complementary shapes, The surface portion has a protrusion portion formed thereon that protrudes toward one surface side, A deck plate characterized in that, when a pair of deck plates are stacked upside down, the bottom surface of the rib that contacts the protrusion portion is formed in a shape complementary to the protrusion portion.

2. 2. The deck plate according to claim 1, wherein when a pair of deck plates are stacked upside down, the entire bottom surface of the rib comes into contact with the contact portion.

3. 3. The deck plate according to claim 1, wherein when a pair of deck plates are stacked upside down, a recess formed on the bottom surface of the rib comes into contact with the protrusion portion.

4. A deck plate formed from a metal plate, in which surface portions and ribs are formed alternately and continuously, When the pair of deck plates are stacked upside down, the bottom surface of the rib and the contact portion of the surface portion that comes into contact with the bottom surface of the rib are formed in complementary shapes, The surface portion has a protrusion portion formed thereon that protrudes toward one surface side, A deck plate characterized in that when a pair of deck plates are stacked upside down in multiple layers, the protrusions that come into contact with each other are formed in complementary shapes.

5. 5. The deck plate according to claim 4, wherein when a pair of deck plates are stacked upside down in multiple layers, the entire area of ​​one of the protrusions contacts the other protrusion.

6. The protrusion portion is a first protrusion portion protruding from the surface portion toward the surface on which the rib is formed; a second protrusion protruding from the surface opposite to the surface on which the rib is formed; The deck plate according to claim 4 or 5, characterized in that

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