Deck plate connecting fittings and deck plate connecting structure

Abstract

This design minimizes the reduction in wind pressure resistance of the deck plate connecting hardware while reducing the force required when folding the plate section. [Solution] The deck plate connecting fitting 100 comprises a fitting portion 110 that fits into the flange 12 of the steel beam 10, a plate portion 120 that extends from the other end 112B of the first piece 112 of the fitting portion 110 and sandwiches the end 52 of the deck plate 50 that is stretched over the flange 12 between the fitting portion 110 and the plate portion 120, and a substantially rectangular opening 140 formed along the direction of the fold line at the boundary portion 130 between the other end 112B of the first piece 112 and the base portion 122 of the plate portion 120.

Description

Technical Field

[0001] The present invention relates to a deck plate connecting fitting and a deck plate connecting structure.

Background Art

[0002] Patent Document 1 discloses a technique related to a deck plate connecting fitting and a deck plate connecting structure. In this prior art, the deck plate connecting fitting includes a fitting portion that fits into a flange of a steel material, and a plate portion that is folded back from an end of the fitting portion and extends to sandwich an end portion of the deck plate spanned on the flange together with the fitting portion.

[0003] Patent Document 2 discloses a technique related to a deck plate locking tool for locking a deck plate to a flange of a beam with an end portion of the deck plate placed on the beam. In this prior art, the deck plate locking tool has an upper piece and a lower piece that are continuous via a folded-back portion and parallel to each other, and a clamping piece having a gap into which an end portion of a substrate of the deck plate enters between the upper piece and the lower piece, a locking piece that is locked to the lower surface of the flange, and a connecting piece that connects the clamping piece and the locking piece, which are formed of a continuous steel material having spring properties or shape memory properties. The clamping piece sandwiches an end portion of the substrate that has entered the gap between the upper piece and the lower piece from above and below by a restoring force based on spring properties or shape memory properties.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The deck plate connecting fitting described in Patent Document 1 addresses the need to reduce the force required when folding the plate portion in order to improve work efficiency. However, if the thickness of the deck plate connecting fitting is reduced to decrease the force required when folding the plate portion, for example, the wind pressure resistance will decrease.

[0006] In view of the above facts, the present invention aims to reduce the force required when folding the plate portion while suppressing the decrease in wind pressure resistance of the deck plate connecting fittings. [Means for solving the problem]

[0007] The first embodiment is a deck plate connecting fitting comprising: a fitting portion that fits into a flange of a steel material; a plate portion that extends from the end of the fitting portion and is folded back, and which sandwiches the end of a deck plate that is placed over the flange between the fitting portion and the plate portion; and a substantially rectangular opening formed along the direction of the fold line at the boundary between the end of the fitting portion and the plate portion.

[0008] In the first embodiment of the deck plate connecting fitting, a substantially rectangular opening is formed along the folding line direction at the boundary between the end of the fitting part and the plate part, thereby reducing the force required when folding the plate part while suppressing a decrease in wind pressure resistance.

[0009] The second embodiment is the deck plate connecting fitting described in the first embodiment, wherein the upper edge of the opening is aligned with the upper surface or near the upper surface of the flange.

[0010] In the second embodiment of the deck plate connecting fitting, the upper edge of the opening is aligned with the upper surface or near the upper surface of the flange, so the bulge at the end after folding the plate portion is reduced.

[0011] The third embodiment is a deck plate connecting fitting comprising: a fitting portion that fits into a flange of a steel material; a plate portion that extends from the end of the fitting portion and is folded back, and which sandwiches the end of a deck plate that is placed over the flange between the fitting portion and the plate portion; and substantially rectangular notches formed along the direction of the fold line at both ends in the direction of the fold line at the boundary between the end of the fitting portion and the plate portion.

[0012] In the third embodiment of the deck plate connecting fitting, substantially rectangular notches are formed along the folding line direction at both ends in the folding line direction at the boundary between the end of the fitting part and the plate part, thereby reducing the force required when folding the plate part while suppressing a decrease in wind pressure resistance.

[0013] The fourth embodiment is the deck plate connecting fitting according to the first embodiment, wherein the upper edge of the notch is along the upper surface or near the upper surface of the flange.

[0014] In the fourth embodiment of the deck plate connecting fitting, the upper edge of the notch is aligned with the upper surface or near the upper surface of the flange, so the bulge at the end after folding the plate portion is reduced.

[0015] The fifth embodiment is a deck plate connecting structure comprising a steel material in which the fitting portion of a deck plate connecting fitting according to any one of the first to fourth embodiments is inserted into a flange, and a deck plate that spans over the flange and whose end is sandwiched between the fitting portion and a plate portion that is folded back from the end of the fitting portion and extends over the flange.

[0016] In the fifth embodiment of the deck plate connecting structure, a substantially rectangular opening or notch is formed along the folding line direction at the boundary between the end of the fitting portion of the deck plate connecting fitting and the plate portion. This reduces the force required to fold the plate portion while suppressing a decrease in wind pressure resistance, thereby improving work efficiency. [Effects of the Invention]

[0017] According to the present invention, it is possible to reduce the force required when folding back the plate portion while suppressing the reduction in wind pressure resistance of the deck plate connecting fittings. [Brief explanation of the drawing]

[0018] [Figure 1] This is a perspective view of a deck plate connecting fitting according to the first embodiment of the present invention. [Figure 2](A) is a side view of the deck plate connecting fitting of FIG. 1 as viewed from the Y direction, and (B) is a front view as viewed from the X direction. [Figure 3] It is a side view of the deck plate connection structure in which the deck plate is connected to the steel frame beam with the deck plate connecting fitting of FIG. 1 as viewed from the Y direction. [Figure 4] It is a perspective view of the deck plate connection structure in which the deck plate is connected to the steel frame beam with the deck plate connecting fitting of FIG. 1. [Figure 5] It is a process diagram showing the construction process of laying the deck plate across the steel frame beam and connecting and fixing it with the deck plate connecting fitting in order from (A) to (D). [Figure 6] It is an explanatory diagram for explaining the bending by the leg of the plate portion of the deck plate connecting fitting in the processes of FIGS. 5(C) and 5(D). [Figure 7] (A) is a cross-sectional view near the opening of the deck plate connecting fitting of FIG. 1, (B) is a cross-sectional view near the opening of the deck plate connecting fitting of the first modification example, and (C) is a cross-sectional view near the opening of the deck plate connecting fitting of the second modification example. [Figure 8] It is a side view showing the swelling of the root portion of the plate portion after bending the plate portion of the deck plate connecting fitting of the second modification example of FIG. 7(C). [Figure 9] (A) is a dimension diagram of the first test piece, (B) is a dimension diagram of the second test piece, and (C) is a dimension diagram of the third test piece. [Figure 10] It is a side view of the test device, (A) is a view of the simulated flange in the initial state, and (B) is a view of the simulated flange in the state where it has moved downward. [Figure 11] It is a graph of an example of the test results. [Figure 12] It is a list of the test results. [Figure 13] It is a perspective view of the deck plate connecting fitting of the second embodiment of the present invention.

Mode for Carrying Out the Invention

[0019] <First Embodiment> A deck plate connecting fitting and deck plate connecting structure according to a first embodiment of the present invention will be described. The two orthogonal directions in the horizontal direction are denoted as the X direction and the Y direction, and are indicated by arrows X and Y, respectively. The vertical direction perpendicular to the X and Y directions is denoted as the Z direction, and is indicated by arrow Z.

[0020] Each drawing is only a schematic representation. The dimensions and proportions of the elements shown in the drawings may not necessarily match those of reality. Dimensions, proportions, and quantities of elements may also not necessarily match between multiple drawings. Hatching to represent cross-sections may be omitted if it makes the drawing difficult to read.

[0021] Furthermore, explanations of configurations not directly related to the present invention and well-known configurations may be omitted or simplified.

[0022] [Deck plate connecting hardware] First, the deck plate connecting fitting of the first embodiment will be described. Note that the directions of the deck plate connecting fitting refer to the directions when it is attached to the flange described later (the state shown in Figures 3 and 4 described later). The X direction is defined as the width direction, the view from the X direction is defined as the front view, and the view from the Y direction is defined as the side view.

[0023] As shown in Figures 1, 2(A), and 2(B), the deck plate connecting fitting 100 is composed of a horizontal U-shaped fitting portion 110 and a plate portion 120. The deck plate connecting fitting 100 of this embodiment is made by bending a flexible, elastically deformable steel plate. The deck plate connecting fitting 100 of this embodiment is made by forming a hot-dip galvanized sheet metal with a plate thickness of 1.2 mm, but is not limited to this. Also, the dimensional specifications of the deck plate connecting fitting 100 of this embodiment are the same as those of the second test specimen 302 (Figure 9(B)) described later, but are not limited to this either.

[0024] The fitting portion 110 of the deck plate connecting fitting 100 is composed of a rectangular first piece 112, a second piece 114, and a third piece 116. The second piece 114 extends from one end 112A of the first piece 112, bending at approximately a right angle. The third piece 116 extends from one end 114A of the second piece 114, bending at an acute angle. As the third piece 116 is bent at an acute angle as described above, it is inclined toward the first piece 112. In other words, the fitting portion 110 is narrower toward the open side of the U-shape.

[0025] Furthermore, as shown in Figures 1 and 2(B), the third piece 116 of the fitting portion 110 is longer than the first piece 112, and the tip 117 of the third piece 116 protrudes beyond the other end 112B of the first piece 112.

[0026] Furthermore, the fitting portion 110 has spring properties, and the third piece 116 elastically deforms so that the open side widens, with the bent portion, which is one end 114A of the second piece 114, acting as a fulcrum, as illustrated by the dashed line (double-dotted line) in Figure 2(B).

[0027] The plate portion 120 extends from the other end 112B of the first piece 112 of the fitting portion 110 by bending. Screw holes 125 for screw fixing, which will be described later, are formed in the plate portion 120 (see Figures 1 and 2(A)). The line used when bending the plate portion 120 is denoted as the fold line T (see Figure 1).

[0028] As shown in Figure 2(B), the plate portion 120 is bent at approximately a right angle from the first piece 112 of the fitting portion 110, but as illustrated by the dashed line, it is bent (folded back) at the base portion 122 of the plate portion 120, becoming approximately parallel to the first piece 112 (see also Figure 3).

[0029] As shown in Figure 1, the upper surface 113 of the first piece 112 of the deck plate connecting fitting 100 in this embodiment is provided with an engraving 70 indicating the specifications of the flange 12 to which the fitting will be used, such as the plate thickness. Note that the engraving 70 is omitted from the illustrations except in Figures 1 and 13. In addition, each corner of the deck plate connecting fitting 100 is rounded, that is, a corner radius is formed.

[0030] As shown in Figures 1, 2(A), and 7(A), an opening 140 is formed at the boundary portion 130 (see Figure 7(C)) between the other end 112B of the first piece 112 of the fitting portion 110 and the base portion 122 of the plate portion 120. The portions on both sides of the opening 140 at the base portion 122 of the plate portion 120 are referred to as a continuous portion 150 (see Figures 1 and 2(A)). In Figures 6 and 8, which will be described later, the opening 140 is shown in black for clarity.

[0031] The opening 140 is a narrow rectangle oriented along the direction of the fold line T (see Figure 1) (in this embodiment, the Y direction). As shown in Figure 7(C), the boundary portion 130 is near the other end 112B of the fitting portion 110.

[0032] As shown in Figure 7(A), the opening 140 in this embodiment is formed spanning the other end 112B of the first piece 112, and the upper edge 142 of the opening 140 (see also Figures 1 and 2(A)) is located near the upper surface 54 of the end 52 of the deck plate 50 (see also Figures 6 and 8), which will be described later, and in this example, slightly above the upper surface 54. The lower edge 144 of the opening 140 is located below the end 52 of the deck plate 50.

[0033] [Deck plate connecting structure] Next, we will describe a deck plate connecting structure 200 in which a deck plate 50 is connected and fixed to the flange 12 of a steel beam 10, which is an example of a steel material, using a deck plate connecting fitting 100.

[0034] As shown in Figures 3 and 4, two steel beams 10, with their longitudinal direction in the Y direction (see Figures 1 and 2(A)), are erected with a gap in the X direction. In this embodiment, the steel beams 10 are made of H-shaped steel having upper and lower flanges 12 and 14 and a web 16, but are not limited to this.

[0035] The deck plates 50 are stretched across these two steel beams 10 to erect the structure. The deck plates 50 are also arranged in the Y direction (see Figures 1 and 2(A)) (see Figure 4).

[0036] The ends 52 on both sides of the deck plate 50 in the X direction are connected and fixed to the upper flanges 12 of the steel beam 10 by deck plate connecting fittings 100. Reinforcing bars are then placed on top of the deck plate 50, and concrete is poured over it.

[0037] As shown in Figure 3, the U-shaped fitting portion 110 of the deck plate connecting fitting 100 is inserted into the upper flange 12 of the steel beam 10. As mentioned above, the U-shaped fitting portion 110 has spring properties and fits by sandwiching the flange 12.

[0038] The end portion 52 of the deck plate 50 rests on the first piece 112 of the fitting portion 110. The plate portion 120 is folded back at the base portion 122 (see dashed line in Figure 2(B)), and the end portion 52 of the deck plate 50 is sandwiched between it and the first piece 112 of the fitting portion 110. The plate portion 120 of the deck plate connecting fitting 100 and the end portion 52 of the deck plate 50 are fixed together by screws 80 inserted through screw holes 125 (see Figure 1) (see also Figure 4). In this embodiment, self-drilling screws 80 are used.

[0039] As shown in Figures 7(A) and 2(A), when the end portion 52 of the deck plate 50 is placed on the first piece 112 of the fitting portion 110 of the deck plate connecting fitting 100, the lower edge 144 of the opening 140 is located on the underside of the deck plate 50. From another perspective, the opening 140 is formed to straddle the fold line T (see Figure 1). Furthermore, the upper edge 142 of the opening 140 is pre-formed to be located on or near the upper surface 54 of the end portion 52 of the deck plate 50 (see also Figures 6 and 8). In this embodiment, as mentioned above, the upper edge 142 of the opening 140 is located near the top of the upper surface 54 (for example, about 1 mm from the upper surface 54).

[0040] [Construction method] Next, we will explain an example of a construction method in which the deck plates 50 are stretched across the steel beams 10 and then connected and fixed using deck plate connecting fittings 100.

[0041] As shown in Figure 5(A), the fitting portion 110 of the deck plate connecting fitting 100 is inserted into the upper flange 12 of the steel beam 10. At this time, the plate portion 120 is in its unbent state. The U-shaped fitting portion 110 has spring properties and clamps the flange 12 with spring force.

[0042] As shown in Figure 5(B), the end portion 52 of the deck plate 50 is placed on the upper surface 113 of the first piece 112 of the fitting portion 110 of the deck plate connecting fitting 100, and then stretched across the predetermined position on the steel beam 10 (see also Figures 3 and 4).

[0043] As shown in Figures 5(C) and 5(D), the plate portion 120 of the deck plate connecting fitting 100 is bent, and the end portion 52 of the deck plate 50 is sandwiched between it and the first piece portion 112 of the fitting portion 110.

[0044] As shown in Figure 6, in this embodiment, the worker bends the board portion 120 by stepping on it with their foot 90. In Figure 6, the opening 140 is shown in black. After bending it with the foot 90, the worker may also use a wooden hammer or the like to strike the board portion 120, especially the base portion 122 of the board portion 120, to make the board portion 120 and the end portion 52 of the deck plate 50 tightly bonded together.

[0045] As shown in Figure 4, after all the deck plates 50 are laid out, the plate portion 120 of the deck plate connecting fitting 100 and the end portion 52 of the deck plate 50 are fixed together with screws 80 from above, as shown in Figures 3 and 4.

[0046] <Mechanism and Effects> Next, the operation and effects of this embodiment will be described.

[0047] The fitting portion 110 of the deck plate connecting fitting 100 is inserted into the flange 12 of the steel beam 10, and the end portion 52 of the deck plate 50, which is erected on the steel beam 10, is placed on the first piece 112 of the fitting portion 110, and the plate portion 120 is bent and sandwiched in place, thereby connecting and fixing the deck plate 50 to the steel beam 10. Thus, the deck plate 50 can be connected and fixed to the steel beam 10 without using welding.

[0048] In this embodiment, when a worker bends the plate portion 120 of the deck plate connecting fitting 100 with their leg 90, the opening 140 is formed, making it easier to bend with the leg 90 compared to when the opening 140 is not formed, thus improving workability. Furthermore, as will be described later, the reduction in the wind resistance of the deck plate 50 due to the formation of the opening 140 is suppressed, and the necessary wind resistance is ensured. In other words, by forming the opening 140 in the deck plate connecting fitting 100, the force required when folding back the plate portion 120 is reduced while suppressing the reduction in wind pressure resistance.

[0049] Furthermore, the opening 140 has an upper edge 142 located near the upper surface 54 of the end 52 of the deck plate 50. The plate portion 120 bends starting from near the position of the upper edge 142 of the opening 140 in the continuous portion 150, so the continuous portion 150 of the plate portion 120 easily adheres to the end 52 of the deck plate 50.

[0050] Furthermore, the plate portion 120 of the deck plate connecting fitting 100 in this embodiment is provided with markings 70 indicating specifications such as the plate thickness of the flange 12. Therefore, incorrect selection of the deck plate connecting fitting 100 during construction is prevented or suppressed.

[0051] Furthermore, each corner of the deck plate connecting fitting 100 in this embodiment is rounded, meaning that a corner radius (R) is formed. Therefore, tearing of the bag in which the deck plate connecting fitting 100 is placed when transporting it from the material storage area to the construction site is prevented or suppressed.

[0052] (Location of the opening) Next, the position of the opening 140 of the deck plate connecting fitting 100 will be explained using Figures 7(A), 7(B), and 7(C), etc.

[0053] Figure 7(A) is a view of the vicinity of the opening 140 of the deck plate connecting fitting 100 in this embodiment. As described above, the opening 140 of the deck plate connecting fitting 100 in this embodiment has its lower edge 144 located below the deck plate 50, and its upper edge 142 located near the upper surface 54 of the end 52 of the deck plate 50. From another perspective, the opening 140 is formed straddling the fold line T (see Figure 1).

[0054] Figure 7(B) shows the vicinity of the opening 140 of the deck plate connecting fitting 101 of the first modified example. In the opening 140 of the deck plate connecting fitting 101 of the first modified example, the lower edge portion 144 is located near the upper surface 113 of the first piece portion 112 of the fitting portion 110. From another point of view, the opening 140 is not formed across the fold line T (see Figure 1), but the lower edge portion 144 is formed near the fold line T.

[0055] Figure 7(C) shows the vicinity of the opening 140 of the deck plate connecting fitting 102 of the second modified example. In the second modified example, the opening 140 of the deck plate connecting fitting 102 has its lower edge 144 located near the upper surface 54 of the end 52 of the deck plate 50. From another perspective, the opening 140 is not formed across the fold line T (see Figure 1), and the lower edge 144 is separated from the fold line T.

[0056] In the first modified example of the deck plate connecting fitting 101 shown in Figure 7(B), the opening 140 is easily deformed when the plate portion 120 is bent at approximately 90° after forming the opening 140 in the sheet metal during the forming process of the deck plate connecting fitting.

[0057] In the second modified example shown in Figure 7(C), when the worker bends the plate portion 120 with their foot 90, the deck plate connecting fitting 102 bends starting from the positions of the upper edge 142 and lower edge 144 of the continuous portion 150 (see Figure 1, etc.) of the base portion 122 of the plate portion 120, as shown in Figure 8. Therefore, the continuous portion 150 of the plate portion 120 bulges out in a convex shape and does not adhere closely to the end portion 52 of the deck plate 50. Note that in Figure 8, as in Figure 6, the opening 140 is shown in black.

[0058] In contrast to these modifications, the opening 140 of the deck plate connecting fitting 100 in this embodiment shown in Figure 7(A) has its lower edge 144 located below the deck plate 50, and its upper edge 142 located near the upper surface 54 of the end 52 of the deck plate 50.

[0059] Therefore, in the molding process of the deck plate connecting fitting, when the plate portion 120 is bent at approximately 90° after forming the opening 140 in the sheet metal (see Figures 1 and 2(A)), the opening 140 is less likely to deform. In addition, the continuous portion 150 of the plate portion 120 adheres closely to the end portion 52 of the deck plate 50 (compare Figures 6 and 8).

[0060] Furthermore, the deck plate connecting fitting 101 of the first modified example shown in Figure 7(B) and the deck plate connecting fitting 102 of the second modified example shown in Figure 7(C) are also examples of embodiments of the present invention. In addition, as shown in Figure 8, if the continuous portion 150 of the base portion 122 of the plate portion 120 (see Figures 1 and 2, etc.) bulges out in a convex shape, it is desirable to smooth it out by tapping it with a wooden hammer or the like.

[0061] <Second Embodiment> A deck plate connecting fitting and deck plate connecting structure according to a second embodiment of the present invention will now be described. Note that the same reference numerals are used for the same components as in the first embodiment, and redundant descriptions will be omitted.

[0062] [Deck plate connecting hardware] First, let me describe the deck plate connecting fitting of the second embodiment.

[0063] As shown in Figure 13, the deck plate connecting fitting 109 is composed of a horizontal U-shaped fitting portion 110 and a plate portion 120. The deck plate connecting fitting 109 of this embodiment is made by bending a flexible, elastically deformable steel plate. The deck plate connecting fitting 109 of this embodiment is made by forming a hot-dip galvanized sheet metal with a plate thickness of 1.2 mm, but is not limited to this. Also, the dimensional specifications of the deck plate connecting fitting 109 of this embodiment are the same as those of the third test specimen 303 (Figure 9(C)) described later, but are not limited to this either.

[0064] The fitting portion 110 of the deck plate connecting fitting 109 is composed of a rectangular first piece 112, a second piece 114, and a third piece 116. The fitting portion 110 is springy, and the third piece 116 elastically deforms so that the open side widens, with the bent portion at one end 114A of the second piece 114 acting as a fulcrum.

[0065] Notches 141 are formed on both sides in the direction of the fold line T (Y direction in this embodiment) at the boundary portion 130 between the other end 112B of the first piece 112 of the fitting portion 110 and the base portion 122 of the plate portion 120. The notches 141 are long rectangles along the direction of the fold line T. The portion between the notches 141 and the base portion 122 of the plate portion 120 is designated as a continuous portion 153.

[0066] [Deck plate connecting structure] Next, a deck plate connection structure will be described in which the deck plate 50 is connected and fixed to the flange 12 of the steel beam 10 using the deck plate connecting fitting 109. Note that the deck plate connection structure of this embodiment is simply the same as the deck plate connection structure 200 of the first embodiment (see Figures 3 and 4, etc.), but with the deck plate connecting fitting 109 replaced by the deck plate connecting fitting 109, so only the positional relationship between the notch 141 and the deck plate 50 will be described.

[0067] When the end portion 52 of the deck plate 50 (see Figures 3 and 4, etc.) is placed on the first piece 112 of the fitting portion 110 of the deck plate connecting fitting 109, the lower edge 145 of the notch 141 is located on the underside of the deck plate 50. From another perspective, the notch 141 is formed to straddle the fold line T. Furthermore, the upper edge 143 of the notch 141 is pre-formed to be located on or near the upper surface 54 of the end portion 52 of the deck plate 50 (see also Figures 7(A), 6 and 8, etc.). In this embodiment, the upper edge 143 of the notch 141 is located near the top of the upper surface 54 (for example, about 1 mm from the upper surface 54).

[0068] [Construction method] The construction method is the same as in the first embodiment (see Figures 5 and 6, etc.), so the explanation will be omitted.

[0069] <Mechanism and Effects> Next, the operation and effects of this embodiment will be described.

[0070] The fitting portion 110 of the deck plate connecting fitting 109 is inserted into the flange 12 of the steel beam 10, and the end portion 52 of the deck plate 50, which is erected on the steel beam 10, is placed on the first piece 112 of the fitting portion 110, and the plate portion 120 is bent and sandwiched in place, thereby connecting and fixing the deck plate 50 to the steel beam 10. Thus, the deck plate 50 can be connected and fixed to the steel beam 10 without using welding.

[0071] In this embodiment, when a worker bends the plate portion 120 of the deck plate connecting fitting 109 with their leg 90 (see Figure 6), the notch 141 is formed, making it easier to bend with the leg 90 compared to when the notch 141 is not formed, thus improving workability. In other words, by forming the notch 141 in the deck plate connecting fitting 109, the force required to fold back the plate portion 120 is reduced while suppressing a decrease in wind pressure resistance.

[0072] Furthermore, the upper edge 143 of the notch 141 is located near the upper surface 54 of the end 52 of the deck plate 50. Since the plate portion 120 bends starting from near the position of the upper edge 143 of the notch 141 in the continuous portion 153, the continuous portion 153 of the plate portion 120 easily adheres to the end 52 of the deck plate 50.

[0073] <Wind pressure resistance test> Next, we will describe the wind pressure resistance tests and results for the deck plate connecting fitting 100 of the first embodiment and the deck plate connecting fitting 109 of the second embodiment.

[0074] • Wind resistance First, let me explain wind pressure resistance.

[0075] If the downward wind pressure on the deck plate 50, which is fixed to the flange 12 by deck plate connecting fittings 100 and 109, is large, the deck plate 50 will lift up, causing the deck plate connecting fittings 100 to deform and fall off. The wind pressure resistance is the limit of wind pressure at which the deck plate connecting fittings 100 and 109 will not fall off.

[0076] • Test specimen Next, I will describe the test specimens used in the test.

[0077] The second test specimen 302 shown in Figure 9(B) has the same structure as the deck plate connecting fitting 100 of the first embodiment (see Figure 1, etc.), and its dimensions are as shown in Figure 9(B). Specifically, it is formed from a hot-dip galvanized sheet metal with a thickness of 1.2 mm, and its width in the Y direction is 100 mm. The length of the plate portion 120 is 150 mm. The length of the plate portion 120 is the length from the upper surface 113 of the first piece portion 112. The length of the opening 140 in the Y direction is 50 mm. Therefore, the lengths of the continuous portions 150 on both sides of the opening 140 in the Y direction are 25 mm each. The width of the opening 140 is 5 mm. The opening 140 is formed spanning the first piece portion 112 (see Figures 1 and 7(A)), and this 5 mm is the width from the other end 112B (see Figure 1).

[0078] The third test specimen 303 shown in Figure 9(C) has the same structure as the deck plate connecting fitting 109 of the second embodiment (see Figure 13), and its dimensions are as shown in Figure 9(C). Specifically, it is formed from a hot-dip galvanized sheet metal with a thickness of 1.2 mm, and its width in the Y direction is 100 mm. The length of the plate portion 120 is 150 mm. The length of the plate portion 120 is the length from the upper surface 113 of the first piece portion 112. The Y-direction length of each notch 141 is 25 mm. Therefore, the Y-direction length of the continuous portion 153 between the notches 141 is 50 mm. The width of the notch 141 is 5 mm. The notch 141 is formed spanning the first piece portion 112, and this 5 mm is the width from the other end 112B (see Figure 13).

[0079] The first test specimen 301 shown in Figure 9(A) has a structure in which no opening 140 or notch 141 is formed. Therefore, the continuous portion 151 in the first test specimen 301 is 100 mm.

[0080] • Test equipment Next, we will describe the test apparatus 500.

[0081] The test apparatus 500 shown in Figures 10(A) and 10(B) consists of a simulated deck 510 that mimics a deck plate 50 (see Figure 3) and a simulated flange 520 that mimics a flange 12 of a steel beam 10 (see Figure 3).

[0082] The simulated deck 510 is supported and fixed at each corner by columns not shown. The simulated flange 520 moves downward by a drive mechanism not shown, and the vertical load acting on the simulated flange 520 can be measured.

[0083] • Test method Next, I will explain the testing method.

[0084] First, as shown in Figure 10(A), the fitting portions 110 of the first test specimen 301, the second test specimen 302, and the third test specimen 303 are inserted into the simulated flange 520 and fitted together, the simulated deck 510 is placed on top, the plate portion 120 is bent and sandwiched in place, and then fixed with screws 80.

[0085] Then, as shown in Figure 10(B), the simulated flange 520 is moved downward to measure the maximum load until the first test specimen 301, the second test specimen 302, and the third test specimen 303 deform and fall off. If no detachment occurs up to a load of 1000 kgf, 1000 kgf is considered the maximum load.

[0086] • Test results Next, I will explain the test results.

[0087] Figure 11 shows an example of test data. The horizontal axis represents the stroke (amount of movement) of the simulated flange 520 as it moves downward from the position shown in Figure 10(A), and the vertical axis represents the vertical load at that time. In Figure 11, the load decreases sharply when the flange moves downward by approximately 65 mm. Therefore, the test specimen deformed and detached at this point. The load of 840 kgf at this point represents the maximum load and wind resistance.

[0088] Five specimens were prepared for the first test (301), numbered No. 1 through No. 5; four specimens were prepared for the second test (302), numbered No. 1 through No. 4; and three specimens were prepared for the third test (303), numbered No. 1 through No. 3. Each specimen was then tested. The table in Figure 12 shows a summary of the test results.

[0089] From the table in Figure 12, the average maximum load (wind pressure resistance) of the second test specimen 302 is -21.3% of the average maximum load (wind pressure resistance) of the first test specimen 301, and the average maximum load (wind pressure resistance) of the third test specimen 303 is -31.8% of the average maximum load (wind pressure resistance) of the first test specimen 301.

[0090] Thus, in the second test specimen 302, which is equivalent to the first embodiment, the continuous section 150 is 50 mm long due to the formation of the opening 140, making the plate section 120 easier to bend. Nevertheless, the maximum load is only about 20% less than that of the first test specimen 301, which has a continuous section 151 without the opening 140 that is 100 mm long, indicating that wind pressure resistance can be ensured.

[0091] Similarly, in the third test specimen 303, which is equivalent to the second embodiment, the continuous section 150 is 50 mm long due to the formation of the notch 141, making the plate section 120 easier to bend. Nevertheless, the maximum load is only about 30% less than that of the first test specimen 301, which has a continuous section 151 of 100 mm where the notch 141 is not formed, indicating that wind pressure resistance is ensured.

[0092] Furthermore, when a similar test was conducted on a test specimen with a Y-direction width that was half (50 mm) of that of the first test specimen 301, it was confirmed that the maximum load (wind pressure resistance) was less than approximately half that of the first test specimen 301. With deck plate connecting fittings whose Y-direction width is half that of the first test specimen 301, it is possible to ensure wind pressure resistance by increasing the number of fittings installed, but this increases the installation and bending work required by workers, thus reducing workability. In other words, the deck plate connecting fittings 100 and 109 of this embodiment can ensure wind pressure resistance without increasing the number of fittings installed.

[0093] Furthermore, tests were conducted separately on the ease of bending the plate portion 120 in the second test specimen 302 and the third test specimen 303. As a result, it was confirmed that the plate portion 120 of the second test specimen 302 and the third test specimen 303 could be bent with approximately half the force required for the first test specimen 301.

[0094] Furthermore, actual work performed by the workers confirmed that the second test specimen 302 and the third test specimen 303 were easier to bend the plate portion 120 of than the first test specimen 301, resulting in improved work efficiency.

[0095] However, while making the opening 140 and notch 141 longer in the Y direction reduces the force required to fold back the plate portion 120, making them too long may reduce wind pressure resistance. Therefore, the lengths of the opening 140 and notch 141 should be set appropriately according to the required wind pressure resistance.

[0096] <Other> Furthermore, the present invention is not limited to the embodiments described above.

[0097] For example, in the above embodiment, the deck plate connecting fittings 100 and 109 had screw holes 125 pre-formed in the plate portion 120, but this is not limited to this. For example, something other than screw holes 125 may be used, such as a mark indicating the screw fixing position. Also, fixing members or fixing methods other than screws 80 may be used. Furthermore, the plate portion 120 and the deck plate 50 do not need to be fixed together, and the plate portion 120 is simply bent to sandwich the deck plate 50.

[0098] Furthermore, in the above embodiment, the deck plate 50 was installed on two parallel steel beams 10, but it is not limited to this. The deck plate 50 may be installed on one steel beam 10 and on a member other than a steel beam 10. In this case, the deck plate connecting structure 200 of the present invention is applied only to the connection between one of the steel beams 10 and the deck plate 50. The member on which the deck plate 50 is installed other than the steel beam 10 is a steel beam such as a steel pipe or a reinforced concrete beam that does not have a flange into which the fitting portion 110 of the deck plate connecting fittings 100 and 109 is inserted.

[0099] Furthermore, in the above embodiment, the plate portion 120 of the deck plate connecting fittings 100 and 109 was bent by stepping on it with the foot 90, but this is not the only way. For example, a worker may bend it by hand using a jig or tool.

[0100] Furthermore, the present invention can be implemented in various forms without departing from the spirit of the invention. Multiple embodiments and modifications can be combined as appropriate. [Explanation of Symbols]

[0101] 10. Steel beam (an example of steel material) 12 flanges 50 Deck Plates 52 End 100 Deck Plate Connecting Brackets 101 Deck Plate Connecting Bracket 102 Deck Plate Connecting Bracket 109 Deck Plate Connecting Bracket 110 Fitting part 120 Board part 122 Root part 130 Boundary site 140 opening 141 Notch 142 Upper part 143 Upper part 144 Lower part 145 Lower part 200 Deck Plate Connecting Structure 302 Second Test Specimen (Deck Plate Connecting Fitting) 303 Third Test Specimen (Deck Plate Connecting Fitting)

Claims

1. A fitting part that fits into the flange of the steel material, A plate portion that extends from the end of the fitting portion and sandwiches the end of the deck plate, which is placed over the flange, with the fitting portion, A substantially rectangular opening is formed along the folding line direction at the boundary between the end of the fitting portion and the plate portion, A deck plate connecting fitting equipped with a deck plate connector.

2. The upper edge of the opening is along the upper surface or near the upper surface of the flange. The deck plate connecting fitting according to claim 1.

3. A fitting part that fits into the flange of the steel material, A plate portion that extends from the end of the fitting portion and sandwiches the end of the deck plate, which is placed over the flange, with the fitting portion, A substantially rectangular notch is formed along the direction of the fold line at both ends in the direction of the fold line at the boundary between the end of the fitting portion and the plate portion, A deck plate connecting fitting equipped with a deck plate connector.

4. The upper edge of the notch is along the upper surface or near the upper surface of the flange. The deck plate connecting fitting according to claim 3.

5. The fitting portion of the deck plate connecting fitting according to any one of claims 1 to 4 is a steel material inserted into a flange, A deck plate is stretched across the flange, with its end sandwiched between the fitting portion and a plate portion that is folded back from the end of the fitting portion on the flange, A deck plate connecting structure equipped with this feature.

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