Gutter support and gutter support structure

Abstract

The present invention aims to provide a gutter support and its mounting structure. [Solution] The present invention relates to a gutter support that is attached to the tip of an eaves board of a roof and supports a gutter, comprising: a support body attached to the tip of the eaves board; a vertical piece extending from a part of the support body in a direction intersecting the support body; a horizontal piece extending from the tip of the vertical piece in a direction intersecting the vertical piece; a vertical locking piece extending from the tip of the horizontal piece toward the support body and rotatably supported with respect to the horizontal piece; an extension piece formed on the tip side of the vertical locking piece and attachable to the upper side of the support body by rotation of the vertical locking piece; and a mounting bolt that is detachably attached to the support body and penetrates the support body, wherein at least one of the vertical piece, the horizontal piece and the vertical locking piece is made of a channel material having a groove and a protruding wall.

Description

Technical Field

[0001] The present invention relates to an eaves gutter support and an eaves gutter support structure.

Background Art

[0002] As a support for an eaves gutter disposed below the eaves tip of a folded-plate roof, a J-shaped eaves gutter support is known, which includes a support body attached to the eaves tip of the folded-plate roof and an eaves gutter receiving portion formed to extend from the support body to support the eaves gutter (see Patent Document 1).

[0003] This eaves gutter support includes a support body having a substantially U-shaped support recess fitted to the eaves tip end portion of the folded-plate roof, and a bolt for screwing into a bolt screw hole drilled in the upper piece of the support recess to tighten and fix the support body to the eaves tip end portion. Further, it includes a U-shaped receiving portion having a vertical piece extending downward from the support body and a horizontal piece and a locking piece attached via an adjustment bolt so as to extend from the lower portion of the vertical piece. Since these vertical piece, horizontal piece, and support piece are assembled in a U-shape, the eaves gutter can be supported thereby. The eaves gutter support described in Patent Document 1 is configured to support the eaves gutter by a U-shaped receiving portion formed by a vertical piece, a horizontal piece, and a locking piece extending downward from the support body. Further, a locking piece is provided rotatably with respect to the horizontal piece via a slide pin, and the eaves gutter can be temporarily installed on the horizontal piece when the locking piece is rotated downward.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In this type of gutter support, the vertical, horizontal, and support pieces for supporting the gutter are generally made up of multiple steel plates. However, since a considerable weight acts on the gutter when it is full of rainwater, the steel plates used are of sufficient thickness to withstand the load equivalent to that when the gutter is full. However, since gutter supports are metal fittings installed in multiples at the eaves of a roof, and a considerable number of these supports are installed on a roof, it is desirable that each individual gutter support be as lightweight and strong as possible. Furthermore, since gutter supports that support wide gutters securely support the bottom surface of the gutter with horizontal pieces, the gutter supports and gutters require a structure that ensures excellent connection at the support points and is resistant to rattling, shifting, and loosening.

[0006] This invention has been made in view of the circumstances described above, and aims to provide a gutter support and gutter support structure that can stably support the gutter while reducing its weight. Furthermore, the present invention aims to provide a gutter support and gutter support structure that can reliably support the bottom plate side of the gutter, has excellent compatibility with the gutter bottom plate, and is less likely to cause damage to the gutter bottom plate when the gutter is supported. [Means for solving the problem]

[0007] To solve the aforementioned problems, the present invention proposes the following embodiments. [1] The gutter support according to this embodiment is a gutter support attached to the tip of the eaves board of a roof to support a gutter, and is characterized in that it comprises a support body attached to the tip of the eaves board, a vertical piece extending from a part of the support body in a direction intersecting the support body, a horizontal piece extending from the tip of the vertical piece in a direction intersecting the vertical piece, a vertical locking piece extending from the tip of the horizontal piece toward the support body and rotatably supported with respect to the horizontal piece, an extension piece formed on the tip side of the vertical locking piece and attachable to the upper side of the support body by rotation of the vertical locking piece, and a mounting bolt that is detachably attached to the support body and penetrates the support body, and at least one of the vertical piece, the horizontal piece and the vertical locking piece is made of a channel material having a groove and a protruding wall.

[0008] If at least one of the vertical pieces, horizontal pieces, and vertical locking pieces is made of channel material having a groove and a protruding wall, the structural strength of the vertical pieces, horizontal pieces, and vertical locking pieces can be increased, providing a gutter support that is resistant to twisting and bending even when supporting a gutter.

[0009] "2" In the gutter support according to this embodiment, the horizontal piece is a member that contacts the bottom plate of the gutter and supports the bottom plate, and a configuration can be adopted in which the protruding wall is formed on the upper surface of the horizontal piece and a rounded portion is formed at the tip edge of the protruding wall.

[0010] By having a protruding wall on the upper side of the horizontal piece, the tip of the protruding wall contacts the bottom plate of the gutter and supports the bottom plate of the gutter. In this case, the protruding wall contacts the bottom plate of the gutter via the rounded portion formed at the tip edge of the protruding wall, so the protruding wall does not damage the bottom plate of the gutter.

[0011] "3" In the gutter support according to this embodiment, a bent piece is formed at the tip of the horizontal piece, the bent piece is made of the channel material, the base end of the vertical locking piece is made of the channel material, the bent piece and the base end of the vertical locking piece are joined so as to be rotatable by an axial member that penetrates the overlapping portion, with the protruding wall overlapping the groove.

[0012] If the horizontal bent pieces are made of channel material, the structural strength of the horizontal bent pieces and the vertical locking pieces can be increased, and a gutter support can be provided that is resistant to twisting and bending even when the gutter is supported by the horizontal pieces and the vertical locking pieces. Furthermore, if the horizontal bent piece and the vertical locking piece are integrated with a shaft member that penetrates both, the vertical locking piece can be rotatably connected to the horizontal bent piece at the tip of the horizontal piece. Therefore, the vertical locking piece can be rotated up and down at the tip of the horizontal piece, and by rotating the vertical locking piece downward, a space can be secured on the side of the horizontal piece for the gutter to pass through. By utilizing this space and installing the gutter on top of the horizontal piece, the gutter can be temporarily supported on the horizontal piece.

[0013] "4" In the gutter support according to this embodiment, the support body has an upper piece installed on the upper side of the tip of the eaves board and a lower piece installed on the lower side of the tip of the eaves board, at least a part of the extension piece that abuts the upper piece is made of a channel material having a protruding wall on one side of the widthwise central part and a recessed groove on the other side, and flat plate portions on both sides of the protruding wall in the widthwise direction, at least a part of the lower piece is made of a channel material having a protruding wall on one side of the widthwise central part and a recessed groove on the other side, and flat plate portions on both sides of the protruding wall in the widthwise direction, and the extension piece and the lower piece face each other with their respective recessed groove sides facing each other via the upper piece, and a mounting bolt that penetrates the protruding wall and the lower piece and a nut that is screwed onto the mounting bolt can be adopted.

[0014] The extension piece and the lower piece are positioned so that their protruding walls are facing opposite directions, sandwiching the upper piece from above and below in the thickness direction. This allows the extension piece, upper piece, and lower piece to be fastened together with mounting bolts that pass through them and nuts that are screwed onto them, making it difficult for rattle or misalignment to occur, and allowing them to be joined in a highly secure state.

[0015] "5" In the gutter support according to this embodiment, a reinforcing plate made of a channel material having a protruding wall that can be fitted into a groove of the horizontal piece and flat plate portions formed on both sides in the width direction of the protruding wall can be detachably attached to the lower surface of the horizontal piece.

[0016] A configuration can be adopted in which a reinforcing plate is provided and a portion of the horizontal piece is supported by the reinforcing plate. By attaching the reinforcing plate to some part under the eaves, a structure can be adopted in which the gutter support is supported by the reinforcing plate via the horizontal piece. Therefore, a gutter support that is less prone to rattling or shifting can be provided.

[0017] "6" The gutter support structure of this embodiment is configured such that the gutter is supported by a gutter support attached to the tip of the eaves board of the roof, wherein the gutter support comprises a support body attached to the tip of the eaves board, a vertical piece extending from a part of the support body in a direction intersecting the support body, a horizontal piece extending from the tip of the vertical piece in a direction intersecting the vertical piece, a vertical locking piece extending from the tip of the horizontal piece toward the support body and rotatably supported with respect to the horizontal piece, an extension piece formed on the tip side of the vertical locking piece and attachable to the upper side of the support body by rotation of the vertical locking piece, and a mounting bolt detachably attached to the support body and passing through the support body, wherein at least one of the vertical piece, the horizontal piece and the vertical locking piece is made of channel material having a groove and a protruding wall.

[0018] If at least one of the vertical pieces, horizontal pieces, and vertical locking pieces is made of channel material having a groove and a protruding wall, the structural strength of the vertical pieces, horizontal pieces, and vertical locking pieces can be increased, providing a gutter support structure that is resistant to twisting and bending even when supporting a gutter.

[0019] "7" In the gutter support structure of this embodiment, the horizontal piece is a member that contacts the bottom plate of the gutter and supports the bottom plate, and the horizontal piece is made of a channel material having a protruding wall in the center of the width direction on the upper side of the horizontal piece and flat plate portions on both sides of the width direction of the protruding wall, and a rounded portion can be formed at the tip edge of the protruding wall.

[0020] By having a protruding wall on the upper side of the horizontal piece, the tip of the protruding wall contacts the bottom plate of the gutter and supports the bottom plate of the gutter. In this case, the protruding wall contacts the bottom plate of the gutter via the rounded portion formed at the tip edge of the protruding wall, so in a structure in which the gutter is supported by a gutter support, the tip edge of the protruding wall does not damage the bottom plate of the gutter.

[0021] "8" In the eaves gutter support structure of this embodiment, a bent piece is formed at the tip of the horizontal piece, and at least the bent piece of the horizontal piece is made of a channel member having a ridge wall at the center in the width direction and flat plate portions on both sides in the width direction of the ridge wall. At least the base end portion of the vertical locking piece is made of a channel member having a ridge wall at the center in the width direction and flat plate portions on both sides in the width direction of the ridge wall. A configuration can be adopted in which the channel member constituting the bent piece of the horizontal piece and the channel member constituting at least the base end portion of the vertical locking piece overlap the protruding sides of the ridge walls and are joined by a shaft member passing through the ridge walls.

[0022] If the bent piece of the horizontal piece is made of a channel member, the structural strength of the bent piece of the horizontal piece and the vertical locking piece can be enhanced, and even if the eaves gutter is supported by the horizontal piece and the vertical locking piece, an eaves gutter support structure that is strong against twisting and bending can be provided. Also, if they are integrated with a shaft member passing through both the bent piece of the horizontal piece and the vertical locking piece, the vertical locking piece can be rotatably connected to the bent piece of the horizontal piece on the tip side of the horizontal piece. Therefore, the vertical locking piece can be pivoted up and down on the tip side of the horizontal piece, and by pivoting the vertical locking piece downward, a space for passing the eaves gutter to the side of the horizontal piece can be secured. By using this space and installing the eaves gutter on the horizontal piece, the eaves gutter can be temporarily supported on the horizontal piece.

[0023] "9" In the eaves gutter support structure of this embodiment, the support tool body has an upper piece installed on the upper surface side of the tip of the eaves front plate and a lower piece installed on the lower surface side of the tip of the eaves front plate. At least a part of the extension piece abutted against the upper piece is made of a channel member having a ridge wall at the center in the width direction and flat plate portions on both sides in the width direction of the ridge wall. At least a part of the lower piece is made of a channel member having a ridge wall at the center in the width direction and flat plate portions on both sides in the width direction of the ridge wall. The extension piece and the lower piece oppose the inner surface sides of the respective ridge walls via the upper piece, oppose the respective flat plate portions via the upper piece, and a configuration can be adopted in which a mounting bolt passing through the ridge wall and the lower piece and a nut screwed onto the mounting bolt are provided.

[0024] The extending piece and the lower piece are provided such that the rib walls of the extending piece and the rib walls of the lower piece face in opposite directions and sandwich the upper and lower portions in the thickness direction of the upper piece. As a result, when the extending piece, the upper piece, and the lower piece are fastened by a mounting bolt that penetrates the extending piece, the upper piece, and the lower piece and a nut that is screwed onto the bolt, rattling and displacement are unlikely to occur, and a gable gutter support structure that can join them while maintaining a high fastening state can be provided.

[0025] 「10」In the gable gutter support structure of this embodiment, a reinforcing plate made of a channel material having a rib wall that can be fitted into the concave groove of the horizontal piece and flat plate portions formed on both sides in the width direction of the rib wall can be detachably attached to the lower surface side of the horizontal piece.

[0026] A gable gutter support structure provided with a reinforcing plate and supporting a part of the horizontal piece with the reinforcing plate can be adopted. By attaching the reinforcing plate to somewhere under the eaves, a structure in which the gable gutter support is supported via the horizontal piece by the reinforcing plate can be adopted. Therefore, a gable gutter support structure in which rattling and displacement are unlikely to occur can be provided.

Advantages of the Invention

[0027] In the gable gutter support of the present invention, at least one of the vertical piece, the horizontal piece, and the vertical side locking piece is made of a channel material having a concave groove and a rib wall, so the structural strength of the vertical piece, the horizontal piece, and the vertical side locking piece can be increased, and a gable gutter support that is strong against twisting and bending even when supporting a gable gutter can be provided.

Brief Description of the Drawings

[0028] [Figure 1] It is a partial cross-sectional view showing a state in which a gable gutter is supported by the gable gutter support of the first embodiment according to the present invention. [Figure 2] It is a perspective view showing a state in which a gable gutter is supported by a plurality of gable gutter supports of the first embodiment. [Figure 3] It is a perspective view showing a state in which a gable gutter is supported by the gable gutter support of the first embodiment. [Figure 4] It is a side view showing a state in which a gable gutter is supported by the gable gutter support of the first embodiment. [Figure 5]This is a perspective view from another direction of the gutter supported by the gutter support of the first embodiment. [Figure 6] This is a side view from another direction showing the gutter supported by the gutter support of the first embodiment. [Figure 7] This is a plan view showing the gutter supported by the gutter support of the first embodiment. [Figure 8] This is a partial cross-sectional view showing the configuration when a reinforcing plate is provided to the gutter support of the first embodiment. [Figure 9] This is a cross-section showing the protruding wall, recessed groove, and flat plate portion in the eaves support of the first embodiment. [Figure 10] Figure 10(A) is an explanatory diagram showing the state in which the bottom plate of the eaves gutter is supported by the horizontal piece of the eaves support of the first embodiment, and Figure 10(B) is an explanatory diagram showing the state in which the bottom plate of the eaves gutter is supported by an eaves gutter support equipped with a modified horizontal piece. [Figure 11] This is an explanatory diagram showing how the bottom plate of the eaves gutter is supported by a flat, horizontal piece that does not have a protruding wall. [Figure 12] This is an explanatory diagram showing a state in which a flat, bent piece and a flat, vertically-oriented locking piece are overlapped and joined together with bolts. [Figure 13] This is an explanatory diagram showing the state in which the protruding wall of the bent horizontal piece and the protruding portion on the base end side of the vertical locking piece are overlapped and joined with bolts in the eaves support of the first embodiment. [Figure 14] This is an explanatory diagram showing a state in which the tip of the eaves board is sandwiched between an extension piece with a protruding wall and a lower piece with a protruding wall, with the protruding walls facing in opposite directions. [Figure 15] This is an explanatory diagram showing a state in which the tip of the eaves board is sandwiched between an extension piece with a protruding wall and a lower piece with a protruding wall, with the protruding walls facing the same direction. [Modes for carrying out the invention]

[0029] Hereinafter, an example of a gutter support and gutter support structure according to the first embodiment of the present invention will be described with reference to Figures 1 to 7. The gutter support according to this embodiment is used, for example, to support the gutter when attached to the tip of the eaves board of a corrugated metal roof. As shown representatively in Figures 1 and 2, in the first embodiment, multiple gutter support members A are installed along the eaves of the corrugated metal roof B at predetermined intervals, and the gutter 40, which will be described later, is supported by multiple gutter support members A. The corrugated metal roof B shown in this embodiment consists of corrugated metal roofing material 4 with multiple peaks 2 and multiple valleys 3 alternating in a continuous pattern. In this embodiment, both the peaks 2 and valleys 3 are formed in a corrugated shape with an isosceles trapezoidal contour. Although there are various types of corrugated metal roofs B, such as seam-jointed, overlapping, and interlocking types, the gutter support members A in this embodiment can be applied to any type of corrugated metal roof.

[0030] As shown in Figures 1 and 2, the gutter support A is bolted to the tip 2A of the eaves board that forms the peak of the ridge 2 of the corrugated metal roof B. The gutter support A has a support body 10 which includes a lower piece 6 that forms a recess 5 into which the tip 2A of the eaves board can be inserted, an upright piece 7, and an upper piece 9. Below the support body 10, a vertical piece 16, a horizontal piece 17, a vertical locking piece 18, and a mounting piece 22, which will be described later, are arranged together with the support body 10 to form an overall rectangular shape. Figures 3 and 5 show perspective views of the configuration in which the gutter support A supports the gutter 40, Figures 4 and 6 show side views of the same configuration, and Figure 7 shows a bottom view of the same configuration.

[0031] In this example, a rising piece 7 is formed on a portion of the end piece 8, which is superimposed on one end of the lower piece 6 in the longitudinal direction, and rises from the lower piece 6 at an angle. An upper piece 9 is formed to extend this rising piece 7. The lower piece 6, rising piece 7, end piece 8, and upper piece 9 are all made of elongated, plate-shaped channel material of the same width. In this example, a groove 6A is formed in the center of the upper surface in the width direction of the lower piece 6, and flat plate portions 6B are formed on both sides of the groove 6A, i.e., on both sides of the lower piece 6 in the width direction. In addition, a protruding wall 6D is formed on the back side (one side of the center in the width direction of the lower piece 6) of the portion where the groove 6A is formed on the lower piece 6. Figure 9 shows the cross-section of the lower piece 6 in the portion where the protruding wall 6D is formed, displayed upside down. For example, a single steel plate is bent, and a groove 6A is provided on the upper side in Figure 1 (lower side in Figure 9), a protruding wall 6D is provided on the lower side in Figure 1 (upper side in Figure 9), and flat plate sections 6B, which are slightly narrower than the protruding wall 6D, are provided on both ends of the protruding wall 6D in the width direction. Furthermore, the cross-sectional shapes of the upper vertical piece 12, lower vertical piece 13, horizontal piece 17, vertical locking piece 18, and mounting piece 22, which will be described later, are all similar to the cross-sectional shapes shown in Figure 9. In addition, the shapes of the lower piece 6, upper vertical piece 12, lower vertical piece 13, horizontal piece 17, vertical locking piece 18, and mounting piece 22 are not limited to the channel material shapes with one protruding wall shown in each figure, but may also be channel material shapes with multiple protruding walls.

[0032] A gap of a certain width is formed between the lower piece 6 and the upper piece 9, and the tip of the eaves board 2A of the corrugated metal roof B is inserted into this gap until its tip reaches the upright piece 7. In other words, the tip of the eaves board 2A is inserted into the recess 5.

[0033] In Figure 1, the gap between the lower piece 6 and the upper piece 9 has the rising piece 7 located at its left end as the far end, so the right end of the gap between the lower piece 6 and the upper piece 9 is referred to as the entrance side of the recess 5. On the right end side of the upper piece 9, an inclined piece 11 is formed in the portion located on the entrance side of the gap, sloping away from the lower piece 6. In the portion where this inclined piece 11 is formed, the gap between the lower piece 6 and the upper piece 9, that is, the opening on the entrance side of the recess 5, is widened, so when inserting the tip of the eaves board 2A of the corrugated metal roof B through this entrance side, the inclined piece 11 acts as a guide, making the insertion of the tip of the eaves board 2A easier.

[0034] The upper vertical piece 12 extends downward at an angle of approximately 90° from the right end of the lower piece 6 in Figure 1 (see Figures 5 and 6). The upper vertical piece 12 has a groove 12A formed in its widthwise center, and flat plate portions 12B are formed on both sides of the groove 12A, i.e., on both sides of the upper vertical piece 12 in the widthwise direction. In addition, a protruding wall 12D is formed on the back side of the groove 12A of the upper vertical piece 12. The overall width, groove width, and flat plate portion width of the upper vertical piece 12 are formed to be the same width as the overall width, groove width, and flat plate portion width of the lower piece 6, respectively.

[0035] The lower vertical piece 13 is superimposed on the upper vertical piece 12, passing from the upper side through the central and lower sides, and further extending the upper vertical piece 12 downwards. A groove 13A is also formed in the lower vertical piece 13, and a flat plate portion 13B and a protruding wall 13D are formed therein. Since the lower vertical piece 13 has an overall width, groove width, and flat plate portion width that correspond to the overall width, groove width, and flat plate portion width of the upper vertical piece 12, the lower vertical piece 13 can be superimposed on the upper vertical piece 12. Furthermore, the upper vertical piece 12 and the lower vertical piece 13 are integrated by a bolt 14 that passes through the overlapping portion of the two pieces and a nut 15 screwed onto it, forming a vertical piece 16.

[0036] A horizontal piece 17 is formed at the lower end of the lower vertical piece 13, extending laterally at an angle slightly wider than 90° relative to the lower vertical piece 13. A groove 17A is formed in the horizontal piece 17, and a flat plate portion 17B and a protruding wall 17D are formed therein. The horizontal piece 17 has an overall width, groove width, and flat plate portion width that correspond to the overall width, groove width, and flat plate portion width of the lower vertical piece 13. In the horizontal piece 17, a rounded portion R is formed at the leading edge of the protruding wall 17D. A short bent piece 17E is formed at the tip of the horizontal piece 17, with the horizontal piece 17 bent outward (downward) at approximately 90°. A vertical locking piece 18 is formed on the outside of this bent piece 17E so as to intersect the horizontal piece 17 at an obtuse angle of nearly 90°. This vertical locking piece 18 has a groove 18A, a flat plate portion 18B, and a protruding wall 18D formed along its entire length, similar to the horizontal piece 17. The length of the vertical locking piece 18 is slightly shorter than the length of the vertical piece 16. Therefore, the tip (upper end) of the vertical locking piece 18 extends to a position close to one end of the lower piece 6.

[0037] A bolt 20 and a nut 21 that screws onto it are provided so as to pass through the portion where the lower end of the vertical locking piece 18 overlaps with the bent piece 17E of the horizontal piece 17. This bolted structure allows the lower end of the vertical locking piece 18 to be rotatably and detachably connected to the bent piece 17E of the horizontal piece 17. The vertical locking piece 18 is rotatably connected to the tip of the horizontal piece 17 with the bolt 20 as the pivot axis. Since the bolt 20 is arranged parallel to the length of the horizontal piece 17, in other words, it can also be said that the vertical locking piece 18 is rotatably supported with the bolt 20, which is aligned with the length of the horizontal piece 17, as the pivot axis. Furthermore, the portion where the lower end of the vertical locking piece 18 overlaps the bent piece 17E of the horizontal piece 17 is not limited to a bolted structure using a bolt 20 and nut 21; for example, the bent piece 17E of the horizontal piece 17 and the lower end of the vertical locking piece 18 may be connected by a hinge. In this case as well, the vertical locking piece 18 is connected to the tip of the horizontal piece 17 so as to be rotatable with the hinge as the pivot axis.

[0038] As shown in Figure 1, the protruding wall 17D of the bent piece 17E protrudes to the left of the flat plate portion 17B, and the groove 18A of the vertical locking piece 18 faces to the right, as shown in Figure 1. Therefore, the protruding wall 17D of the bent piece 17E is inserted into the groove 18A of the vertical locking piece 18, and the base ends of the bent piece 17E and the vertical locking piece 18 are overlapped. A bolt 20 passes through the overlapped portion, joining the two. An example of this joining structure is shown in an enlarged view in Figure 13.

[0039] A roughly L-shaped mounting piece 22 is provided on the outer upper end of the vertical locking piece 18, with its lower side aligned with the outer upper end of the vertical locking piece 18 and its upper side aligned with the upper piece 9. The mounting piece 22 has a groove 22A in its widthwise center, flat plate portions 22B on both sides of the groove 22A in the widthwise direction, and a protruding wall 22D on the back side of the groove 22A. The lower side of the mounting piece 22 has a groove 22A, flat plate portions 22B and protruding wall 22D in the same way as the vertical locking piece 18, and their overall width, groove width and flat plate portion width are the same as the overall width, groove width and flat plate portion of the vertical locking piece 18. For this reason, the lower side of the mounting piece 22 overlaps and follows the outer upper end of the vertical locking piece 18. A bolt 25 and a nut 26 that screws onto it are provided so as to pass through the portion where the lower side of the mounting piece 22 overlaps with the outer upper end of the vertical locking piece 18.

[0040] The upper part of the mounting piece 22 is attached to the upper side of the upper piece 9 as an extension piece 22F. The upper tip portion of the mounting piece 22 is superimposed on the flat upper piece 9. The extension piece 22F also has a groove 22A, a flat portion 22B, and a protruding wall 22D, similar to the mounting piece 22, and has a shape equivalent to the cross-sectional shape of the lower piece 6 shown in Figure 9.

[0041] Near the inclined piece 11, through-holes are formed in the portion where the lower piece 6 and the upper piece 9 overlap with a gap in between, penetrating the lower piece 6 and the upper piece 9, and a first mounting bolt 31 is attached as a fixing member so as to pass through these through-holes. A nut 33 is screwed onto the first mounting bolt 31. In addition, through-holes are formed in the portion where the extension piece 22F overlaps the upper piece 9, penetrating the extension piece 22F, the upper piece 9, and the lower piece 6, and a second mounting bolt 32 is attached as a fixing member so as to pass through these through-holes. A nut 34 is screwed onto the second mounting bolt 32.

[0042] As shown in Figure 1, when the tip portion 2A of the eaves board is inserted into the recess 5, a through-hole is also formed in the tip portion 2A of the eaves board so as to align with the aforementioned through-hole. Therefore, the first mounting bolt 31 is provided so as to pass through the lower piece 6, the upper piece 9 and the tip portion 2A of the eaves board inserted between them, and the gutter support A is fixed to the tip portion 2A of the eaves board by tightening the nut 33 screwed onto the first mounting bolt 31. Furthermore, the second mounting bolt 32 is provided so as to pass through the extension piece 22F, the upper piece 9, the lower piece 6, and the tip portion 2A of the eaves board inserted between them, and the gutter support A is fixed to the tip portion 2A of the eaves board by tightening the nut 34 screwed onto the second mounting bolt 32.

[0043] Figure 1 shows the state in which the gutter support A is attached to the tip 2A of the eaves board of the corrugated metal roof B. The gutter 40 is supported inside a rectangular frame enclosed by the vertical piece 16, horizontal piece 17, and vertical locking piece 18 of the gutter support A. The gutter 40 consists of a bottom plate 40A, an inner plate 40B, and an outer plate 40C. Outward-facing ear portions 40E are formed at the upper ends of the inner plate 40B and the outer plate 40C, respectively. As shown in Figure 1, in this embodiment, the height of the outer plate 40C of the gutter 40 is formed to be slightly higher than the height of the inner plate 40B. The gutter 40 is, for example, a large gutter made of resin, such as a large gutter with a base plate 40A that is more than 200 mm wide. It is preferable to apply a gutter support A to support such a large gutter 40. In the gutter 40, if the width of the base plate 40A is increased by 1.6 times, the cross-sectional area of ​​the flow path of the gutter 40 becomes three times larger. Since such a large gutter 40 becomes considerably heavy when filled with rainwater, it is desirable to apply a gutter support A with a robust structure like that of this embodiment.

[0044] Furthermore, in the gutter support A, a gutter upper edge locking piece 42 is formed on the inside of the lower vertical piece 13 to secure the upper edge of the inner plate 40B, and a gutter upper edge locking piece 43 is formed on the inside of the vertical locking piece 18 to secure the upper edge of the outer plate 40C. The upper edge locking piece 43 of the eaves gutter consists of a base end 43A that contacts the inner surface of the vertical locking piece 18, an upright piece 43B extending from the end of the base end 43A at approximately a right angle to the base end 43A, and an extended piece 43C extending from the tip of the upright piece 43B at approximately a right angle to the upright piece 43B. The upright piece 43B and the extended piece 43C form an L-shaped locking portion 43D. The base end 43A is rotatably supported by a screw (shaft member) 44 that penetrates the central part of the base end 43A and the adjacent vertical locking piece 18 in the thickness direction of the two.

[0045] The base end portion 43A is made of a concave curved plate, with its central portion facing the groove 18A of the adjacent vertical locking piece 18, and the central portion of the base end portion 43A in contact with the bottom of the groove 18A. The width of the base end portion 43A is formed to be approximately the same as the width of the groove 18A in the vertical locking piece 18, and is sized so that the periphery of the base end portion 43A and the inner wall of the groove 18A do not interfere with each other when the base end portion 43A rotates. Therefore, as the base end portion 43A rotates around the screw, the upper edge locking piece 43 of the eaves gutter rotates along the inner surface of the vertical locking piece 18. In addition, the length of the upright piece 43B (the length in the direction perpendicular to the base end portion 43A when the base end portion 43A is considered as a flat plate) is formed to be slightly longer than the horizontal length of the ear portion 40E formed on the eaves gutter 40.

[0046] The upper edge locking piece 42 of the eaves gutter consists of a base end 42A that is in contact with the inner surface of the lower vertical piece 13, an upright piece 42B that extends from the end of the base end 42A at approximately a right angle to the base end 42A, and an extended piece 42C that extends from the tip of the upright piece 42B at approximately a right angle to the upright piece 42B. An L-shaped locking portion 42D is formed from an upright piece 42B and an extended piece 42C. The base end portion 42A is rotatably supported by a screw (shaft member) 45 that penetrates the central part of the base end portion 42A and the adjacent lower vertical piece 13 and upper vertical piece 12 in the thickness direction of those pieces. The base end portion 42A is formed in a roughly U-shape with low side wall portions 42b provided on both sides in the width direction of the flat plate portion 42a, inclined relative to the flat plate portion 42a. The upper edge locking piece 42 of the eaves gutter is roughly U-shaped, but since it is made of resin and the side wall portions 42b are low, the base end portion 42A can be rotated slightly so that the side wall portions 42b can pass over the edge of the protruding wall 12D. Alternatively, if the base end portion 42A of the upper edge locking piece 42 of the eaves gutter is made flat, or if the inner surface of the lower vertical piece 13 is made flat, the upper edge locking piece 42 of the eaves gutter can be supported so as to be rotatable.

[0047] The following describes the work process for attaching the gutter support A to the corrugated metal roof B, which has the configuration shown in Figure 2, and for supporting the gutter 40 with the gutter support A. First, the tip 2A of the eaves plate of the corrugated metal roof B is inserted into the recess 5 of the gutter support A. With the eaves plate tip 2A aligned with the through holes formed in the lower piece 6 and the upper piece 9, the first mounting bolt 31 is inserted through these through holes, and the nut 33 is screwed onto the first mounting bolt 31 and tightened. Furthermore, the vertical locking piece 18 is rotated downwards around the bolt 20 so that the vertical locking piece 18 and the mounting piece 22 are facing downwards. In this initial state, the storage space partitioned by the horizontal piece 17 and the vertical piece 16 is not closed by the vertical locking piece 18 and the mounting piece 22, but is open.

[0048] The gutter support A can be attached to the tip 2A of the eaves board by fastening the first mounting bolt 31 and nut 33 together. In this state, the gutter 40 can be placed on the horizontal piece 17 of the gutter support A and temporarily supported. As shown in Figure 2, multiple gutter support brackets A are installed at the eaves. When installing gutters 40 on multiple installed gutter support brackets A, it is necessary to install one gutter 40 and then connect the other gutters 40 via joints (not shown). In this case, as explained earlier based on Figure 12, it is necessary to lift the end of the gutter 106 and fit the end of the gutter 106 into the joint 108 at the end of the already installed gutter 105.

[0049] In the case of the gutter 40 of this embodiment, as explained earlier based on Figure 12, it is necessary to install a joint (not shown) at the end of the already installed gutter 40, apply adhesive to the inner surface of this joint, and then lift and fit the adjacent gutter 40 into this joint. To achieve this, it is desirable to rotate the upper edge locking pieces 42 and 43 of the eaves gutter, as shown in Figure 1, upward so as not to interfere with the lifting and fitting of the eaves gutter 40, and to install them in a direction that avoids obstruction to the eaves gutter 40. After fitting the end of one gutter 40 into the joint of the already installed gutter 40 and joining them, the vertical locking piece 18 is rotated upward so that the vertical locking piece 18 and the mounting piece 22 are facing upward, and the extended piece 22F at the tip of the mounting piece 22 is placed on top of the upper piece 9.

[0050] If the upper edge locking piece 43 of the eaves gutter, which is currently facing upwards, is rotated downwards to the state shown in Figure 1 (downward), then the locking portion 43D of the upper edge locking piece 43 of the eaves gutter can be used to hold down the upper edge of the outer plate 40C, as shown in Figure 1. Also, if the locking portion 42D of the upper edge locking piece 42 of the eaves gutter was facing upwards, the upper edge locking piece 42 of the eaves gutter can be rotated so that the locking portion 42D faces downwards, as shown in Figure 1, to hold down the upper edge of the inner plate 40B.

[0051] When the extension piece 22F is placed on the upper piece 9, the through holes formed in the mounting piece 22, the upper piece 9, the tip of the eaves board 2A, and the lower piece 6 are aligned. The second mounting bolt 32 is then passed through these holes, and the nut 34 is screwed onto the second mounting bolt 32. After this, the upper edge locking piece 43 of the eaves gutter is rotated downwards to position the extension piece 43C inside the outer plate 40C, thereby enabling the eaves gutter 40 to be supported by the eaves gutter support A.

[0052] With the gutter support A configured as described above, the tip of the eaves board 2A can be inserted into the recess 5 of the support body 10, and the gutter support A can be temporarily fixed to the tip of the eaves board with the first mounting bolt 31 that passes through the upper piece 9 of the support body 10, the tip of the eaves board 2A, and the lower piece 6. If the vertical locking piece 18 is rotated downward in this state, the gutter 40 can be installed and temporarily supported along the horizontal piece 17 and the vertical piece 16. Furthermore, the process of inserting the tip portion 2A of the eaves board into the recess 5 of the support body 10 and tightening the first mounting bolt 31 can be performed safely and easily by a single worker.

[0053] With the gutter support A temporarily fastened by the first mounting bolt 31, the gutter support A is in a state where it can stably support even heavy objects. Therefore, even if a heavy gutter 40 is placed on the horizontal piece 17, the gutter 40 will not become unstable. For this reason, workers can perform the temporary support work on the gutter 40 safely and securely, even in places with poor working environments such as high places. Furthermore, when joining another gutter to the temporarily supported gutter 40 via a joint, it is necessary to lift and fit the end of the other gutter into the temporarily supported gutter 40, but the gutter upper edge locking piece 42 does not get in the way during this work.

[0054] Furthermore, after temporarily supporting the gutter 40, the vertical locking piece 18 is rotated upward, allowing the extension piece 22F at the tip of the mounting piece 22 to be attached to the upper piece 9 of the support body 10. From this state, the gutter support can be completed by fastening the extension piece 22F, the upper piece 9, the tip of the eaves board 2A, and the lower piece 6 with the second mounting bolt 32 that passes through them and the nut 34 that is screwed onto it. In this case, to prevent the upper edge locking piece 43 of the eaves gutter from interfering with the upper edge of the outer plate 40C of the eaves gutter 40, rotate the tip of the upper edge locking piece 43 so that it is closer to the tip of the vertical locking piece 18. After attaching the extension piece 22F to the upper piece 9, rotate the upper edge locking piece 43 downward, and as shown in Figure 1, the locking portion 43D can be used to hold down the upper edge of the outer plate 40C. With the above configuration, the first mounting bolt 31 and the second mounting bolt 32 can stably support the gutter support A, allowing even heavy gutters 40 to be stably supported, and also enabling safe and easy installation.

[0055] If the gutter support A has the above configuration, then a portion of the lower piece 6, the upper vertical piece 12, the lower vertical piece 13, the horizontal piece 17, and the vertical locking piece 18 all have recessed grooves and protruding walls, so all of them have a structure that is resistant to twisting. Therefore, even if the gutter 40 is heavy and is subjected to shaking or twisting due to wind, earthquakes, etc., a robust gutter support A can be provided that can stably support the gutter 40. When supporting the gutter 40, if the gutter support A is fixed to the tip 2A of the eaves board using the first mounting bolt 31 and the second mounting bolt 32, torsional forces tend to concentrate on the upper side of the vertical piece 16 and the upper side of the vertical locking piece 18. In this regard, the upper side of the vertical piece 16 has a structure that is resistant to twisting because it is a two-layer structure consisting of an upper vertical piece 12 and a lower vertical piece 13 with a recessed groove and a protruding wall fitted together. Furthermore, the upper side of the vertical locking piece 18 also has a structure that is resistant to twisting because it is a two-layer structure consisting of a vertical locking piece 18 with a recessed groove and a protruding wall fitted together and a mounting piece 22. Therefore, the gutter support A is resistant to twisting and has a robust structure that can stably support the gutter 40.

[0056] Furthermore, the connection between the upper piece 9 and the mounting piece 22 is not limited to a bolted structure using the first mounting bolt 31 and nut 33; for example, the tip of the upper piece 9 and the tip of the mounting piece 22 may be connected by a hinge. In this case, the mounting piece 22 is connected to the tip of the upper piece 9 so as to be rotatable with the hinge as the pivot axis, and the mounting piece 22 is rotatably supported so as to rotate on the plane formed by the upper piece 9 and the mounting piece 22. Furthermore, the connection between the bent piece 17E of the horizontal piece 17 and the vertical locking piece 18 may also be made by hinge. In this case, the vertical locking piece 18 and the mounting piece 22 are rotatable by hinges, and the vertical locking piece 18 and the mounting piece 22 are connected by a bolt 25 that passes through the overlapping portion of the upper part of the vertical locking piece 18 and the lower part of the mounting piece 22, and a nut 26 that is screwed onto it.

[0057] The above-mentioned gutter support A supports the bottom plate 40A of the gutter 40 with a horizontal piece 17. Figure 10(A) shows an enlarged view of the part where the horizontal piece 17 supports the bottom plate 40A of the gutter 40. Since the gutter 40 is provided with a water slope, the horizontal piece 17 contacts the leading edge of the protruding wall 17D at an angle as shown in Figure 10(A). However, since a rounded portion R is formed at the leading edge of the protruding wall 17D, the bottom plate 40A of the gutter 40 will not be damaged. In contrast, as shown in Figure 11, if the horizontal piece 17' were simply a flat plate, the corner of the leading edge of the horizontal piece 17' would come into contact with the bottom surface of the bottom plate 40A of the gutter 40. This could potentially damage the bottom plate 40A of the gutter 40. For example, this contact may occur when installing the gutter 40, or after installation, when strong forces are applied to the gutter 40 during heavy rain or strong winds such as those caused by typhoons. In this respect, if the horizontal piece 17 has the curved section R described above, there is no risk of damaging the bottom plate 40A of the gutter 40.

[0058] Figure 10(B) is a cross-sectional view showing a modified example of the horizontal piece 17 provided on the gutter support A. In this modified example, the horizontal piece 171 has flat plate portions 17B formed on both sides in the width direction of the protruding wall 17D, intersecting the protruding wall 17D at an angle close to right, and a recessed groove 17A is formed in the portion sandwiched between the protruding wall 17D and the left and right flat plate portions 17B. In this application, the lower piece 6, upper vertical piece 12, lower vertical piece 13, horizontal piece 17, vertical locking piece 18, and mounting piece 22, which are made from channel material, can adopt a structure having protruding walls of various shapes, and a configuration having a protruding wall 17D with the shape shown in Figure 10(B) is also within the scope of this application. In the configuration shown in Figure 10(B), since rounded sections R are formed on both sides in the width direction at the tip of the protruding wall 17D, the bottom plate 40A of the gutter 40 can be supported without damaging the bottom plate 40A of the gutter 40, similar to the configuration shown in Figure 10(A).

[0059] Furthermore, if the eaves gutter 40 is made of resin, a joint is used to connect the ends of adjacent eaves gutters 40. However, after placing the eaves gutter 40 on the horizontal piece 17 of the eaves gutter support A, it is necessary to move the eaves gutter 40 along its longitudinal direction and insert it into the joint. In this case, eaves gutters 40 with a base plate 40A width exceeding 200 mm, especially those 300 mm or more, or eaves gutters 40 with a metal plate as a core material inside the base plate or inner and outer plates, are difficult to move after being placed on the horizontal piece 17 of the eaves gutter support A due to their own weight. However, with the configuration of the horizontal piece 17 having the aforementioned curved section R, construction is easier when connecting eaves gutters 40 using a joint, and there is no risk of damaging the base plate 40A of the eaves gutter 40 during construction.

[0060] The above-mentioned gutter support A has a structure in which the bent piece 17E of the horizontal piece 17 and the base end of the vertical locking piece 18 are overlapped as shown in Figure 13, and then joined by a bolt 20 and a nut 21. As shown in Figure 13, if the protruding wall 17D of the bent piece 17E and the groove 18A on the base end side of the vertical locking piece 18 are overlapped and joined by a bolt 20 that passes through the overlapping portion, this joint portion is less likely to shift even if twisting is applied to the gutter support A, and has a robust structure that can stably support the gutter 40. In contrast, as shown in Figure 12, if the bent piece 17E' is flat and the base end of the vertical locking piece 18 is also flat, then even if the two are fastened together with a bolt 20, there is a risk of misalignment occurring at the joint between the base end of the vertical locking piece 18 and the bent piece 17E'. Since there is a small clearance between the through hole for inserting the bolt 20 and the bolt 20, this clearance may cause relative misalignment or twisting of the vertical locking piece 18 and the bent piece 17E within the range of the clearance.

[0061] The above-mentioned gutter support A has a structure in which the tip 2A of the eaves board is sandwiched from above and below by the lower piece 6 and the extension piece 22F, and fixed with a bolt 32. A schematic of this structure is shown in Figure 14. Although there is also an upper piece 9 between the lower piece 6 and the extension piece 22F, the upper piece 9 is omitted from the description in Figure 14. In the lower piece 6 and the extension piece 22F, the protruding wall 6D of the lower piece 6 and the protruding wall 22D of the extension piece 22F are oriented in opposite directions along the thickness direction of the tip of the eaves board 2A. In other words, the groove 6A of the lower piece 6 and the groove 22A of the extension piece 22F are facing each other and are positioned to sandwich the tip of the eaves board 2A. As shown in Figure 14, by positioning the protruding wall 6D of the lower piece 6 and the protruding wall 22D of the extension piece 22F and fastening them together with bolts 32, a structure can be created in which the tip of the eaves board 2A is firmly fastened by the lower piece 6 and the extension piece 22F. In contrast, if, as shown in Figure 15, the protruding wall 6D of the lower piece 6 and the protruding wall 22D of the extension piece 22F are arranged and fastened together with bolts 32 and nuts 34, the bolts 32 will be prone to loosening.

[0062] Figure 8 shows a structure in which a reinforcing plate 50 is further added when the gutter support A with the above configuration is installed at the eaves. The reinforcing plate 50 has a base plate portion 50A that is attached to the lower side of the horizontal piece 17 and a bent piece 50B formed on one end of the base plate portion 50A. The reinforcing plate 50 is attached to the horizontal piece 17 by bolts 51 with the bent piece 50B facing the wall surface under the eaves. The reinforcing plate 50 has a cross-section equivalent to the cross-section of the lower piece 6 shown in Figure 9. By fixing the bent portion 50B of the reinforcing plate 50 to the wall surface under the eaves using bolts 52, the gutter support A can be held even more stably. Furthermore, by fitting the protruding wall of the substrate portion 50A into the recessed groove 17A on the lower side of the horizontal piece 17, a structure resistant to twisting and displacement can be created in which the horizontal piece 17 is stably supported by the reinforcing plate 50, similar to the structure described based on Figure 13. [Explanation of Symbols]

[0063] A... Gutter support, B... Corrugated metal roof, 2... Peak section, 2A... Tip of eaves board, 3... Valley section 5...recess, 6...lower piece, 6A...groove, 6D...protruding wall, 7...upper piece, 9...upper piece 10...support body, 12...upper vertical piece, 12A...concave groove, 12D...projection wall, 13...bottom vertical piece, 13A...concave groove, 13D...projection wall, 16...vertical piece, 17...horizontal piece, 17A...concave groove, 17D...Protruding wall, R...Rounded section, 18...Vertical locking piece, 18A...Recessed groove, 18D...Protruding wall, 22...Mounting piece, 22A...Recessed groove, 22D...Protruding wall, 22F...Extension piece, 22A...Recessed groove, 31...First mounting bolt, 32...Second mounting bolt, 40...Eaves gutter, 40A...Bottom plate, 40B...Inner panel, 40C...Outer panel, 42, 43...Upper edge locking piece for the eaves gutter. 42D, 43D...locking part.

Claims

1. A gutter support that is attached to the tip of the eaves board of a roof and supports the gutter, The support body attached to the tip of the eaves board, A vertical piece extending from a part of the support body in a direction intersecting the support body, A transverse piece extending from the tip of the vertical piece in a direction intersecting the vertical piece, A vertical locking piece extends from the tip of the horizontal piece toward the support body and is rotatably supported relative to the horizontal piece, An extension is formed on the tip side of the vertical locking piece and can be attached to the upper side of the support body by the rotation of the vertical locking piece, A gutter support that is detachably attached to the support body and has mounting bolts that pass through the support body, wherein at least one of the vertical piece, the horizontal piece, and the vertical locking piece is made of a channel material having a groove and a protruding wall.

2. The gutter support according to claim 1, wherein the horizontal piece is a member that contacts and supports the bottom plate of the gutter, the protruding wall is formed on the upper surface of the horizontal piece, and a rounded portion is formed at the leading edge of the protruding wall.

3. A bent piece is formed at the tip of the transverse piece, and the bent piece is made of the channel material, and the base end of the longitudinal locking piece is made of the channel material, The gutter support according to claim 1 or claim 2, wherein the base end of the bent piece and the vertical locking piece overlap the protruding wall in the recessed groove and are rotatably joined by a shaft member that penetrates the overlapping portion.

4. The support body has an upper piece installed on the upper side of the tip of the eaves board and a lower piece installed on the lower side of the tip of the eaves board. At least a portion of the extension piece that abuts the upper piece is made of a channel material having a protruding wall on one side of the widthwise central portion and a recessed groove on the other side, with flat plate portions on both sides of the widthwise protruding wall. At least a portion of the lower piece is made of a channel material having a protruding wall on one side of the central part in the width direction and a recessed groove on the other side, with flat plate portions on both sides of the protruding wall in the width direction. The extended piece and the lower piece face each other with their respective groove sides connected by the upper piece, The gutter support according to claim 1 or 2, further comprising the mounting bolt that penetrates the protruding wall and the lower piece, and a nut that is screwed onto the mounting bolt.

5. The gutter support according to claim 1 or 2, wherein a reinforcing plate made of a channel material having a protruding wall that can be fitted into a groove in the horizontal piece and flat plate portions formed on both sides in the width direction of the protruding wall is detachably attached to the lower surface side of the horizontal piece.

6. The gutter is supported by a gutter support attached to the tip of the eaves board of the roof, and the gutter support is The support body attached to the tip of the eaves board, A vertical piece extending from a part of the support body in a direction intersecting the support body, A transverse piece extending from the tip of the vertical piece in a direction intersecting the vertical piece, A vertical locking piece extends from the tip of the horizontal piece toward the support body and is rotatably supported relative to the horizontal piece, An extension is formed on the tip side of the vertical locking piece and can be attached to the upper side of the support body by the rotation of the vertical locking piece, A gutter support structure that is detachably attached to the support body and has mounting bolts that pass through the support body, wherein at least one of the vertical piece, the horizontal piece, and the vertical locking piece is made of a channel material having a groove and a protruding wall.

7. The aforementioned horizontal piece is a member that contacts and supports the bottom plate of the gutter, the aforementioned protruding wall is formed on the upper surface of the horizontal piece, and a rounded portion is formed at the leading edge of the protruding wall. The gutter support structure according to claim 6.

8. A bent piece is formed at the tip of the transverse piece, and the bent piece is made of the channel material, and the base end of the longitudinal locking piece is made of the channel material, The bent piece and the base end of the longitudinal locking piece overlap the protruding wall in the groove, and are rotatably joined by a shaft member that penetrates the overlapping portion. The gutter support structure according to claim 6 or claim 7.

9. The support body has an upper piece installed on the upper side of the tip of the eaves board and a lower piece installed on the lower side of the tip of the eaves board. At least a portion of the extension piece that abuts the upper piece is made of a channel material having a protruding wall on one side of the widthwise central portion and a recessed groove on the other side, with flat plate portions on both sides of the widthwise protruding wall. At least a portion of the lower piece is made of a channel material having a protruding wall on one side of the central part in the width direction and a recessed groove on the other side, with flat plate portions on both sides of the protruding wall in the width direction. The extended piece and the lower piece face each other with their respective groove sides connected by the upper piece, The mounting bolt and nut are provided, with the mounting bolt penetrating the aforementioned protruding wall and the aforementioned lower piece. The gutter support structure according to claim 6 or 7.

10. The gutter support structure according to claim 6 or 7, wherein a reinforcing plate made of a channel material having a protruding wall that can be fitted into a groove of the horizontal piece and flat plate portions formed on both sides in the width direction of the protruding wall is detachably attached to the lower surface side of the horizontal piece.

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