Wire installation structure and wire installation method

Abstract

To provide a wire installation structure and a wire installation method capable of enhancing safety by suppressing direct treading on a slate roof.SOLUTION: A wire installation structure according to an embodiment is a wire installation structure provided on a slate roof 1. A wire installation structure includes a base part 21 provided on a slate roof 1 and formed in a frame shape in a plan view, a plurality of leg parts 23 extending obliquely upward from a peripheral edge part of the base part 21 in the plan view, and a wire fixing part 24 for fixing a wire at upper parts of the plurality of leg parts 23. The base portion 21 has a holding portion 21f that holds the scaffold board 22 inside the base portion 21 in a plan view.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to a wire installation structure and a wire installation method. [Background technology]

[0002] Patent Document 1 describes a roof mounting jig for installing life rope supports, which are used to tension life ropes in the construction of steel-frame buildings, etc. The roof mounting jig has a first angle iron extending along the roof surface, a second angle iron extending perpendicular to the first angle iron along the roof surface at one end of the first angle iron, and a third angle iron extending parallel to the second angle iron at the other end of the first angle iron.

[0003] The life rope post mounting part is welded to the second angle member. The life rope post has a connecting ring at the top and a gripping part and bolt at the bottom. The life rope post is fixed to the roof surface mounting jig by fitting the gripping part into the life rope post mounting part. The life rope is connected to the life rope post by hanging the life rope hook on the connecting ring.

[0004] Patent Document 2 describes a life rope tensioning tool that is installed on a folded-plate roof with ridges. The life rope tensioning tool has a base that extends linearly along the ridges, a fixed beam that extends perpendicular to the base at one end, and a movable beam that extends perpendicular to the base at the other end. The base is U-shaped, with a web that extends horizontally and a pair of flanges that rise from both ends of the web.

[0005] A cylindrical sleeve extending vertically upward from the base is inserted into the U-shaped part of the base, and a life rope tensioning pole is inserted into the sleeve. The life rope tensioning pole is equipped with a life rope fixing bracket at its top for securing the life rope. The life rope's hook is fixed to the life rope fixing bracket, thereby connecting the life rope to the life rope tensioning pole.

[0006] Patent Document 3 describes a safety device equipped with a life rope post. The safety device has a life rope post, a rod-shaped first mounting member on which the life rope post is placed, a rod-shaped connecting part extending diagonally downward from the life rope post, and a second mounting member extending parallel to the first mounting member at the lower end of the connecting part. The life rope post has a rope hook part at its upper part. The life rope is connected to the life rope post by hanging it on the rope hook part. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-158868 [Patent Document 2] Japanese Patent Application Publication No. 2018-91092 [Patent Document 3] Japanese Patent Application Publication No. 2020-33710 Summary of the Invention [Problem to be solved by the invention]

[0008] However, because slate roofs are relatively thin, if a worker steps directly on the slate roof, there is a risk of the roof being punctured or the worker falling. Therefore, slate roofs are often provided with running boards, and workers walk on the running boards. Wire installation structures, such as the roof surface mounting jigs to which the life ropes are connected, are installed while the worker stands on the running board. However, when installing the wire installation structure, there is a risk that the worker standing on the running board may lose his footing. As such, there is a risk of stepping directly on the slate roof when installing the wire installation structure, and there is room for improvement in terms of safety.

[0009] The present disclosure aims to provide a wire installation structure and a wire installation method that can increase safety by preventing direct stepping on a slate roof. [Means for solving the problem]

[0010] (1) The wire installation structure according to the present disclosure is a wire installation structure to be installed on a slate roof. The wire installation structure is installed on the slate roof and includes a base portion formed in a frame shape in a plan view, a plurality of legs extending diagonally upward from the periphery of the base portion in a plan view, and wire fixing portions for fixing wires at the upper portions of the plurality of legs. The base portion has a holding portion for holding scaffolding boards inside the base portion in a plan view.

[0011] In this wire installation structure, a base portion formed in a frame shape in a plan view is fixed onto a slate roof. A plurality of legs extend diagonally upward from the peripheral edge of the base portion in a plan view, and a wire fixing portion to which the wire is fixed is provided at the top of the plurality of legs. A plurality of legs extend diagonally downward from the wire fixing portion, and the lower ends of the plurality of legs are fixed to the peripheral edge of the frame-shaped base portion, thereby increasing the resistance of the wire installation structure to pulling on the wire. A holding portion for holding a scaffolding board is provided inside the base portion formed in a frame shape in a plan view. Therefore, the scaffolding board is held by the holding portion, and workers can work on this scaffolding board, reducing the possibility of workers stepping directly on the slate roof. Therefore, direct stepping on the slate roof can be prevented, thereby increasing safety.

[0012] (2) In the above (1), the wire fixing portion may be annular and have a hole for hooking one end of the wire. In this case, the wire is hooked into the circular hole, which reduces rattling of the wire and increases the degree of freedom of movement of the wire.

[0013] (3) A wire installation method according to the present disclosure is a wire installation method for installing a wire installation structure on a slate roof, the wire installation method comprising the steps of: fixing a base formed in a frame shape in a plan view on the slate roof; holding scaffolding boards by fitting them into holding parts located inside the base in a plan view; fixing one end of each of a plurality of legs to the peripheral edge of the base in a plan view; and fixing wires to wire fixing parts located at the tops of the plurality of legs.

[0014] In this wire installation method, a base formed in a frame shape in plan view is fixed onto a slate roof, and one end of each of multiple legs is fixed to the peripheral edge of the base. Then, a wire is fixed to a wire fixing portion located at the top of the multiple legs. The multiple legs extend diagonally downward from the wire fixing portion, and the lower ends of the multiple legs are fixed to the peripheral edge of the frame-shaped base, thereby increasing the resistance of the wire installation structure to pulling on the wire. A holding portion is provided inside the base formed in a frame shape in plan view, and a scaffolding board is fitted into the holding portion. Therefore, work can be performed on the scaffolding board held by the holding portion, reducing the possibility of workers stepping directly on the slate roof. This prevents workers from stepping directly on the slate roof, thereby increasing safety. [Effects of the Invention]

[0015] According to the present disclosure, it is possible to prevent people from stepping directly on a slate roof, thereby increasing safety. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view showing an example of a slate roof. [Figure 2] FIG. 2 is an enlarged perspective view of an example slate roof. [Figure 3] Fig. 3(a) is a perspective view showing the C-shaped steel and roofing material of the slate roof of Fig. 2. Fig. 3(b) is a cross-sectional view showing the C-shaped steel and roofing material of the slate roof of Fig. 2. [Figure 4] FIG. 4 is a diagram showing steps of a wire installation method according to an embodiment. [Figure 5] FIG. 5 is a perspective view showing a base portion of the wire installation structure according to the embodiment. [Figure 6] FIG. 6 is a diagram showing steps of a wire installation method according to an embodiment. [Figure 7] FIG. 7 is a diagram showing steps of a wire installation method according to an embodiment. [Figure 8]FIG. 8 is a diagram showing a plurality of legs and a wire fixing portion of the wire installation structure according to the embodiment. [Figure 9] 9(a) and 9(b) are enlarged views of the wire fixing portion of FIG. [Figure 10] FIG. 10 is a diagram showing a wire installation structure according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of a wire installation structure and a wire installation method according to the present disclosure will be described with reference to the drawings. In the description of the drawings, identical or corresponding elements are designated by the same reference numerals, and duplicate explanations will be omitted as appropriate. The drawings may be partially simplified or exaggerated for ease of understanding, and the dimensional proportions and the like are not limited to those shown in the drawings.

[0018] FIG. 1 is a diagram showing a slate roof 1 and work being done on the slate roof 1. The slate roof 1 is a thin-plate roof made of a material whose main component is cement, for example. When a worker M works on the slate roof 1, there is a risk of stepping through the slate roof 1 or falling from the slate roof 1.

[0019] To prevent someone from stepping through the slate roof 1, a running board B is sometimes installed on top of the slate roof 1. The running board B is a work passageway that workers M walk on. To prevent falls from the slate roof 1, a life rope wire C is installed on top of the slate roof 1, and a safety harness A worn by workers M is sometimes connected to the wire C. The wire C is stretched, for example, between multiple life rope tensioning devices 2 installed on the top of the slate roof 1. The life rope tensioning devices 2 are also called stanchions.

[0020] Fig. 2 is a perspective view showing an example of a slate roof 1. Fig. 3(a) is an enlarged perspective view of a portion of the slate roof 1. Fig. 3(b) is a cross-sectional view of the slate roof 1. As shown in Figs. 2, 3(a) and 3(b), the slate roof 1 comprises, for example, a plurality of C-shaped steel beams 11 and corrugated slates 12 placed on the plurality of C-shaped steel beams 11.

[0021] The C-shaped steel 11 has an upper surface 11b on which the corrugated slate 12 is placed, a lower surface 11c located below the upper surface 11b, and a side surface 11d connecting the upper surface 11b and the lower surface 11c. The upper surface 11b extends, for example, in a first direction D1 and a second direction D2 intersecting the first direction D1, and has a thickness in a third direction D3 intersecting both the first direction D1 and the second direction D2. The first direction D1 is the longitudinal direction of the C-shaped steel 11, and the second direction D2 is the width direction of the C-shaped steel 11. For example, the first direction D1 and the second direction D2 are horizontal directions, and the third direction D3 is vertical. The first direction D1, the second direction D2, and the third direction D3 are perpendicular to each other.

[0022] The lower surface portion 11c extends, for example, parallel to the upper surface portion 11b. The side surface portion 11d extends in the third direction D3 between the upper surface portion 11b and the lower surface portion 11c. The side surface portion 11d extends in the first direction D1 and the third direction D3 and has a thickness in the second direction D2. The slate roof 1 has a plurality of C-shaped steel beams 11, which are lined up along the second direction D2.

[0023] The corrugated slate 12 has a corrugated shape. The corrugated slate 12 has a plurality of recesses 12b and a plurality of protrusions 12c, and the recesses 12b and the protrusions 12c are alternately arranged along the first direction D1. The corrugated slate 12 is made of a material containing cement, for example. However, the material of the corrugated slate 12 is not particularly limited.

[0024] The slate roof 1 has, for example, a plurality of hook bolts 13 that secure the corrugated slates 12 to the C-shaped steel 11. The hook bolt 13 has a rod-shaped part 13d with a hook part 13b at one end that can be hooked onto the C-shaped steel 11 and a threaded part 13c at the other end, and a nut 13f that is screwed onto the threaded part 13c of the rod-shaped part 13d that protrudes above the corrugated slates 12.

[0025] The corrugated slate 12 has a through hole 12d through which a rod-shaped portion 13d is passed. A hook portion 13b at the lower end of the rod-shaped portion 13d extending downward from the through hole 12d is hooked onto the C-shaped steel 11, and a nut 13f is tightened onto a threaded portion 13c of the rod-shaped portion 13d extending upward from the through hole 12d. In this way, the hook bolt 13 is attached to the C-shaped steel 11 and the corrugated slate 12.

[0026] The wire installation structure 20 (see FIG. 10) according to this embodiment is used as the above-mentioned life rope tensioning tool 2. The wire installation structure 20 is installed on a slate roof 1. Below, an example of a wire installation method for installing the wire installation structure 20 on a slate roof 1 (corrugated slates 12) will be described.

[0027] First, as shown in Fig. 4, a base 21 formed in a frame shape in plan view is fixed onto the slate roof 1 (step of fixing the base). Fig. 5 is a diagram showing the base 21. As shown in Figs. 4 and 5, the base 21 is provided on the slate roof 1 and is formed, for example, in a rectangular frame shape in plan view.

[0028] The base 21 has a plurality of first members 21b extending in a first direction D1 and a plurality of second members 21c extending in a second direction D2. The first members 21b are elongated. When the first members 21b are cut along a plane perpendicular to the longitudinal direction of the first members 21b, the cross section is, for example, L-shaped. For example, the first members 21b and the second members 21c are L-shaped angles. As an example, the first members 21b and the second members 21c are perforated angles.

[0029] The first member 21b is composed of, for example, a first plate portion 21b1 that extends in the first direction D1 and the second direction D2 and has a thickness in the third direction D3, and a second plate portion 21b2 that extends in the first direction D1 and the third direction D3 and has a thickness in the second direction D2. The second plate portion 21b2 is a portion that rises upward from the end of the first plate portion 21b1 in the second direction D2.

[0030] The first member 21b has a through-hole 21b3 that penetrates the first member 21b. The through-hole 21b3 has, for example, an oval shape with a major axis extending in the first direction D1. The first member 21b has a plurality of through-holes 21b3. The plurality of through-holes 21b3 are lined up along the first direction D1. The through-hole 21b3 is formed in each of the first plate portion 21b1 and the second plate portion 21b2.

[0031] The second member 21c has an elongated shape. When the second member 21c is cut along a plane perpendicular to the longitudinal direction of the second member 21c, the cross section is, for example, L-shaped. The second member 21c is composed of, for example, a first plate portion 21c1 that extends in the first direction D1 and the second direction D2 and has a thickness in the third direction D3, and a second plate portion 21c2 that extends in the second direction D2 and the third direction D3 and has a thickness in the first direction D1. The second plate portion 21c2 is a portion that rises upward from the end of the first plate portion 21c1 in the first direction D1.

[0032] The second member 21c has a through-hole 21c3 that penetrates the second member 21c. The through-hole 21c3 has, for example, an oval shape with a major axis extending in the second direction D2. The second member 21c has a plurality of through-holes 21c3. The plurality of through-holes 21c3 are lined up along the second direction D2. The through-hole 21c3 is formed in each of the first plate portion 21c1 and the second plate portion 21c2.

[0033] A plurality of first members 21b and a plurality of second members 21c are arranged in a frame shape to form the base portion 21. Ends of two first members 21b extending in the first direction D1 are joined to ends of two second members 21c extending in the second direction D2, respectively, to form the frame-shaped base portion 21. At this time, the first members 21b are arranged so that the second plate portions 21b2 face outward from the base portion 21 in a plan view, and the second members 21c are arranged so that the second plate portions 21c2 face outward from the base portion 21 in a plan view.

[0034] In this embodiment, the base portion 21 is formed by two first members 21b and four second members 21c. Two of the four second members 21c are arranged to extend along the second direction D2 from a midpoint of the first member 21b in the first direction D1. For example, an end of the second member 21c in the second direction D2 is joined onto the first plate portion 21b1 of the first member 21b.

[0035] By forming the base portion 21 as described above, a holding portion 21f is formed in the base portion 21, into which a scaffolding board 22 (see FIG. 6), which will be described later, is fitted. The holding portion 21f holds the scaffolding board 22 inside the base portion 21 in a plan view. For example, the holding portion 21f is formed between two second members 21c that are arranged to extend along the second direction D2 from a midpoint in the first direction D1 of the first member 21b. In other words, the holding portion 21f is the frame portion 21g that is located in the center in the first direction D1, out of three frame portions 21g lined up along the first direction D1. The scaffolding board 22 is fitted into this frame portion 21g.

[0036] The base 21 is fixed to the slate roof 1 (corrugated slates 12) by, for example, hook bolts F. These hook bolts F may be the existing hook bolts 13 described above, or new hook bolts F. If the existing hook bolts 13 are not deteriorated, they may be used, but if the hook bolts 13 are deteriorated, it is preferable to use new hook bolts.

[0037] For example, the base 21 is fixed to the slate roof 1 by fastening a nut at the top of the base 21 to a hook bolt F that is hooked onto the C-shaped steel 11 and passed through the through hole 12d of the corrugated slate 12 and the through holes 21b3 and 21c3 of the base 21. As mentioned above, the through holes 21b3 and 21c3 through which the hook bolt F is inserted are oval in shape. Therefore, the hook bolt F can be easily inserted into the through holes 21b3 and 21c3, and the base 21 can be easily fixed to the slate roof 1.

[0038] For example, each of the four corners of the base 21 in plan view is fixed to the slate roof 1 by a hook bolt F. Also, the intersection P of the first member 21b and the second member 21c may be fixed to the slate roof 1 by a hook bolt. In this case, there are eight fixing points of the base 21 to the slate roof 1. For example, the work of fixing the base 21 to the slate roof 1 is performed by a worker M standing on a running board B that has been installed on the slate roof 1 in advance, starting from the point closest to the running board B.

[0039] In this case, first, the intersection P1 of the base 21 closest to the running board B is fixed to the slate roof 1. More specifically, a worker M standing on the running board B fixes the two intersections P1 closest to the running board B to the slate roof 1. Next, the intersection P2 of the base 21 second closest to the running board B is fixed to the slate roof 1.

[0040] At this time, worker M standing on running board B fixes the two intersections P2 that are second closest to running board B to the slate roof 1. In this way, by fixing the intersections P to the slate roof 1 in order of closest to running board B (worker M), the risk of worker M slipping off running board B and the risk of worker M stepping directly onto the slate roof 1 can be reduced, thereby improving safety.

[0041] 6, the scaffolding plank 22 is held by fitting it into the holding portion 21f located inside the base portion 21 in a plan view (step of holding the scaffolding plank). The holding portion 21f is formed, for example, as a rectangle with vertices P2 of the two intersecting portions of the base portion 21 second closest to the running board B and P3 of the two intersecting portions of the base portion 21 third closest to the running board B. The scaffolding plank 22 is fitted into this holding portion 21f.

[0042] In this way, by fitting the scaffolding board 22 into the holding portion 21f formed inside the base portion 21, which has a frame shape in a plan view, part of the base portion 21 can be effectively used as a scaffold. After fitting the scaffolding board 22 into the holding portion 21f, worker M stands on the scaffolding board 22 and fixes the intersection P3 of the base portion 21 that is third closest to the running board B and the intersection P4 that is fourth closest to the running board B to the slate roof 1. By fixing the eight intersection portions P to the slate roof 1 as described above, the fixing of the base portion 21 to the slate roof 1 is completed.

[0043] After the base 21 has been fixed to the slate roof 1, as shown in FIG. 7, the multiple legs 23 of the stanchion 20A, which is part of the wire installation structure 20, are fixed to the base 21. The number of legs 23 in the stanchion 20A is, for example, four. For example, the wire installation structure 20 includes the base 21 and the stanchion 20A. FIG. 8 is a diagram showing the stanchion 20A. As shown in FIGS. 7 and 8, one end 23b of each of the multiple legs 23 is fixed to the peripheral edge of the base 21 in a plan view. For example, the one end 23b of the leg 23 is fixed to either the first member 21b or the second member 21c of the base 21 with a bolt.

[0044] For example, the stanchion 20A is foldable, which makes it easy to carry the stanchion 20A onto the slate roof 1. The stanchion 20A has, for example, a plurality of legs 23 fixed to the base 21, a wire fixing portion 24 provided at the end opposite to one end 23b of the legs 23, a first rod-shaped portion 25 extending downward from the wire fixing portion 24, and a second rod-shaped portion 26 extending horizontally between the first rod-shaped portion 25 and the legs 23.

[0045] The multiple legs 23 are arranged to extend obliquely upward from the peripheral edge of the base 21 in a plan view. At this time, the multiple legs 23 are opened relative to the wire fixing portion 24 and the first rod-shaped portion 25, and one end 23b of each of the opened multiple legs 23 is fixed to the base 21. The one end 23b is fixed to the base 21 with a bolt, for example, by impact.

[0046] The stanchion 20A has, for example, the same number of second rod-shaped portions 26 as the number of legs 23. The second rod-shaped portions 26 are provided to fix the distance between the opened legs 23 and the first rod-shaped portions 25, i.e., the degree to which the legs 23 are opened from the first rod-shaped portions 25. When the legs 23 are opened relative to the first rod-shaped portions 25, the second rod-shaped portions 26 are fixed to the first rod-shaped portions 25 and the legs 23, thereby fixing the degree to which the legs 23 are opened relative to the first rod-shaped portions 25. The second rod-shaped portions 26 are fixed to the first rod-shaped portions 25 and the legs 23, for example, by bolts and nuts.

[0047] The wire fixing portion 24 fixes the wires at the upper portions of the multiple legs 23. Figures 9(a) and 9(b) are diagrams showing the attachment structure of the wire fixing portion 24 to the legs 23. As shown in Figures 9(a) and 9(b), the wire fixing portion 24 has a hole 24b into which one end of the wire C is hooked.

[0048] For example, the wire-fixing portion 24 is annular, and the hole 24b is circular. For example, the wire-fixing portion 24 has an annular portion 24c in which the hole 24b is formed, and a protruding portion 24d protruding from the annular portion 24c. As an example, the protruding portion 24d is plate-shaped. For example, the protruding portion 24d and the leg portion 23 have a through-hole through which the bolt V is passed.

[0049] The wire fixing part 24 is attached to the leg part 23 by fastening a nut N to a bolt V that is passed through the through hole of the protrusion 24d and the through hole of the leg part 23. For example, the protrusion 24d and the leg part 23 have a plurality of (for example, two) of the above-mentioned through holes, and by providing a plurality of bolts V and a plurality of nuts N, the wire fixing part 24 can be fixed to the leg part 23 more firmly.

[0050] After the stanchion 20A is fixed to the base 21, the wire C is fixed to the wire fixing portion 24 located on the upper part of the plurality of legs 23 (step of fixing the wire), as shown in Fig. 10. For example, the wire C is fixed to the wire fixing portion 24 by hooking a hook provided at one end of the wire C into the annular portion 24c of the wire fixing portion 24.

[0051] A plurality of bases 21 may be installed on the slate roof 1, and the legs 23 of the stanchions 20A may be fixed to each of the plurality of bases 21, and then the wire C may be fixed so as to span the plurality of wire fixing parts 24. In this case, one end of the wire C is fixed to one of the two wire fixing parts 24, and the other end of the wire C is fixed to the other of the two wire fixing parts 24. As described above, the wire installation structure 20 installed on the slate roof 1 can be used as the life rope tensioning tool 2 described above.

[0052] Next, the effects obtained from the wire installation structure 20 and wire installation method according to this embodiment will be described. In the wire installation structure 20 and wire installation method according to this embodiment, a base 21 formed in a frame shape in a plan view is fixed onto a slate roof 1. A plurality of legs 23 extend obliquely upward from the periphery of the base 21 in a plan view, and a wire fixing portion 24 to which a wire C is fixed is provided at the top of the plurality of legs 23. The plurality of legs 23 extend obliquely downward from the wire fixing portion 24, and one end 23b (lower end) of the plurality of legs 23 is fixed to the periphery of the frame-shaped base 21, thereby increasing the resistance of the wire installation structure 20 to the pulling of the wire C. In this embodiment, the strength of the wire installation structure 20 can be increased to the extent that the wire installation structure 20 can remain fixed to the slate roof 1 even when three people are pulling on the wire C.

[0053] 5 and 6, a holding portion 21f for holding a scaffolding board 22 is provided inside the base portion 21, which is formed in a frame shape in a plan view. Therefore, the scaffolding board 22 is held by the holding portion 21f, and the worker M can work on the scaffolding board 22, thereby reducing the possibility that the worker M will step directly on the slate roof 1. Therefore, it is possible to prevent the worker M from stepping directly on the slate roof 1 and increase safety.

[0054] In this embodiment, the wire fixing portion 24 is annular and has a hole 24b into which one end of the wire C is hooked. In this case, since the wire C is hooked into the circular hole 24b, rattle of the wire C can be suppressed and the degree of freedom of movement of the wire C can be increased.

[0055] The above describes embodiments of the wire installation structure and wire installation method according to the present disclosure. However, the wire installation structure and wire installation method according to the present disclosure are not limited to the above-described embodiments and may be modified within the scope of the gist described in the claims. In other words, the function, shape, size, material, number, and arrangement of each part of the wire installation structure, as well as the content and order of the steps of the wire installation method, may be modified as appropriate within the scope of the above-described gist.

[0056] For example, in the above-described embodiment, an example was described in which the wire installation structure 20 had four legs 23. However, the number of legs 23 is not particularly limited. However, four legs 23 is preferable because this increases the stability of the wire installation structure 20 and prevents the wire installation structure 20 from becoming too heavy.

[0057] In the above-described embodiment, an example has been described in which eight intersections P of the base 21 are fixed to the slate roof 1. However, the number of fixing points of the base 21 to the slate roof 1 is not limited to eight, and may be, for example, six. From the viewpoint of strength, it is preferable that the number of fixing points of the base 21 to the slate roof 1 be six or more.

[0058] In the above-described embodiment, an example has been described in which the frame-shaped base 21 is formed by two first members 21b extending in the first direction D1 and four second members 21c extending in the second direction D2. However, the frame-shaped base may be formed by two first members 21b and three second members 21c, or by two first members 21b and two second members 21c. In this way, the number of first members 21b and second members 21c forming the base can be changed as appropriate.

[0059] In the above-described embodiment, the base portion 21 is formed in a rectangular frame shape in a plan view. However, the shape of the base portion in a plan view does not have to be a rectangular frame shape, and may be a polygon other than a rectangle, such as a triangular shape, a pentagonal shape, a hexagonal shape, or an octagonal shape. In this way, the shape of the base portion in a plan view is not particularly limited.

[0060] In the above-described embodiment, a wire installation structure 20 used as a life rope tensioning tool 2 was described. However, the wire installation structure does not have to be a life rope tensioning tool 2, and may be one in which a wire other than a life rope is installed. In this way, the wire installation structure and wire installation method according to the present disclosure can be applied to various wires. [Explanation of symbols]

[0061] 1...Slate roof, 2...Main rope tensioning tool, 11...C-shaped steel, 11b...Upper surface portion, 11c...Lower surface portion, 11d...Side portion, 12...Corrugated slate, 12b...Concave portion, 12c...Convex portion, 12d...Through hole, 13...Hook bolt, 13b...Hook portion, 13c...Threaded portion, 13d...Rod-shaped portion, 13f...Nut, 20...Wire installation structure, 20A...Stanchion, 21...Base portion, 21b...First member, 21b1...First plate portion, 21b2...Second plate portion, 21b3...Through hole, 21c...Second member, 2 1c1...first plate portion, 21c2...second plate portion, 21c3...through hole, 21f...holding portion, 21g...frame portion, 22...scaffolding board, 23...leg portion, 23b...one end, 24...wire fixing portion, 24b...hole, 24c...annular portion, 24d...protruding portion, 25...first rod-shaped portion, 26...second rod-shaped portion, A...safety belt, B...step, C...wire, D1...first direction, D2...second direction, D3...third direction, F...hook bolt, M...worker, N...nut, P, P1, P2, P3, P4...intersection portion, V...bolt.

Claims

1. A wire installation structure installed on a slate roof, a base portion provided on the slate roof and formed in a frame shape in a plan view; a plurality of legs extending obliquely upward from a peripheral edge of the base in a plan view; a wire fixing portion for fixing a wire at an upper portion of the plurality of legs; Equipped with The base portion has a holding portion that holds a scaffolding board inside the base portion in a plan view, Wire installation structure.

2. The wire fixing portion is annular and has a hole through which one end of the wire is hooked. The wire installation structure of claim 1 .

3. A wire installation method for installing a wire installation structure on a slate roof, comprising: A step of fixing a base portion formed in a frame shape in a plan view on the slate roof; A step of holding the scaffolding board by fitting the scaffolding board into a holding portion located inside the base portion in a plan view; a step of fixing one end of each of the plurality of legs to a peripheral edge portion of the base portion in a plan view; a step of fixing a wire to a wire fixing portion located at an upper portion of the plurality of legs; Equipped with Wire installation method.

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