Device for installing net

Abstract

To provide a net erection device having a structure capable of further easily installing a shatterproof net at a preferable height position.SOLUTION: A net erection device 100 includes a plurality of net erection jigs 10 to be attached to a construction scaffold 130. A wire 120 from which a shatterproof net 110 is suspended can be erected between the plurality of net erection jigs 10. The net erection jig 10 includes a jig attachment / detachment portion 15 for detachably attaching the net erection jig 10 to a construction scaffold 130 in a state in which the net erection jig 10 protrudes upward from the construction scaffold 130.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a device for erecting a net.

Background Art

[0002] As a device for erecting a net, for example, there is one described in Patent Document 1. The net erection device of Patent Document 1 (described as a rubble scattering prevention structure in the same document) is used for a structure (described as a building in the same document) having one or a plurality of floor materials partitioning the inside into a plurality of floors, and includes a plurality of support members (described as columns in the same document) fixed to the floor material of the structure. The plurality of support members protrude upward from the floor material of the uppermost floor, and a wire (described as a support wire in the same document) from which a scattering prevention net is suspended can be installed between the upper end portions of the support members.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the net erection device of Patent Document 1, there is room for improvement in the structure for more easily installing the scattering prevention net at a preferable height position.

[0005] The present invention has been made in view of the above problems, and provides a net erection device having a structure that can more easily install a scattering prevention net in a preferable arrangement.

Means for Solving the Problems

[0006] According to the present invention, it includes a plurality of net erection jigs attached to a construction scaffold. The anti-scattering net can be installed between the plurality of jig for net installation, The jig for net installation includes a jig attachment / detachment part for detachably attaching the jig for net installation to the construction scaffold in a state where the jig for net installation protrudes above the construction scaffold. 、 The jig for net installation is a horizontal member that is detachably attached to the construction scaffolding by the jig attachment / detachment part in a state of extending in the horizontal direction, a support member that is detachably attached to the horizontal member in a state of being erected vertically, and includes the scattering prevention net is suspended at the upper end of the support member, the attachment position of the support member to the horizontal member is variable in the horizontal direction A device for installing a net is provided.

Effect of the Invention

[0007] According to the present invention, it is possible to provide a device for installing a net having a structure that can more easily install the anti-scattering net in a preferable arrangement.

Brief Description of the Drawings

[0008]

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Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are assigned to the same components, and the description will be omitted as appropriate. In Figs. 1 and 2, the splash prevention net 110 and the wire 120 are shown by a two-dot chain line. Also, in Figs. 5 and 6, the net erection jig 10 and the construction scaffold 130 are schematically shown, respectively. Further, in Figs. 3(a), 3(b), 4, 9, 11, 10, 15, 16 and 18, the construction scaffold 130 is shown by a two-dot chain line. Also, in Figs. 3(a) and 3(b), the wire 120 is shown by a two-dot chain line, and in Fig. 4, the splash prevention net 110 is shown by a two-dot chain line. In the following description, unless otherwise specified, the positional relationship of each part of the net erection device 100 indicates the positional relationship in a state where the net erection device 100 is attached to the construction scaffold 130.

[0010] As shown in any one of FIGS. 1 to 4, the net erection device 100 according to the present embodiment includes a plurality of net erection jigs 10 attached to the construction scaffold 130, and a scattering prevention net 110 can be erected between the plurality of net erection jigs 10. The net erection jig 10 includes a jig attachment / detachment part 15 for detachably attaching the net erection jig 10 to the construction scaffold 130 in a state where the net erection jig 10 protrudes above the construction scaffold 130. More specifically, the net erection jig 10 includes, for example, a horizontal member 20 that is detachably attached to the construction scaffold 130 by the jig attachment / detachment part 15 in a state of extending in the horizontal direction, and a support member 30 that is detachably attached to the horizontal member 20 in a state of being erected vertically.

[0011] In the case of the present embodiment, as an example, a wire 120 from which the scattering prevention net 110 is suspended can be erected between the plurality of net erection jigs 10. As shown in FIGS. 5 and 6, in a plan view, one end of the wire 120 is held at the upper end portion 30a of the support member 30 of the net erection jig 10 on one side, and the other end of the first wire 121 is held at the upper end portion 30a of the support member 30 of the net erection jig 10 on the other side, with the building 140 sandwiched therebetween and the net erection jigs 10 facing each other.

[0012] The construction scaffold 130 to which the plurality of net erection jigs 10 are attached is used, for example, during the demolition work of a structure (for example, the building 140) having at least one floor (floor), and the construction scaffold 130 is erected around the building 140. The scattering prevention net 110 is disposed at least above the building 140 in a state of being suspended by the wire 120, suppressing the scattering of demolition materials such as bolt fragments to the outside of the building 140 when performing the demolition work of the building 140.

[0013] According to the present embodiment, the net erection device 100 includes a plurality of net erection jigs 10 that are detachably attached to the construction scaffold 130 in a state of protruding above the construction scaffold 130. Thereby, the wire 120 from which the splash prevention net 110 is suspended can be satisfactorily erected at a position above the construction scaffold 130. Therefore, during the dismantling work, a sufficient separation distance in the vertical direction between the floor to be dismantled and the splash prevention net 110 can be ensured, so that interference between the heavy machine 150 such as a hydraulic excavator disposed on the floor and the splash prevention net 110 can be suppressed. That is, the splash prevention net can be more easily installed in a preferable arrangement.

[0014] The construction scaffold 130 has a general structure. As shown in FIGS. 4 and 7, the building frame 130a constituting the construction scaffold 130 is configured, for example, by assembling a pair of frame bodies 131 that are respectively erected at intervals from each other, and a base member 134 and braces 135 that are erected between the pair of frame bodies 131. The frame body 131 has, for example, a pair of leg portions 132 that are each formed in a rod shape and arranged vertically, and a rod-shaped base holding beam portion 133 that is horizontally erected between the upper end portions of the pair of leg portions 132. An X-shaped brace 135 is erected between one pair of leg portions 132 of the pair of frame bodies 131. On the other hand, no brace 135 is erected between the other pair of leg portions 132 of the pair of frame bodies 131. Instead, a horizontal member 20 is attached by a jig attachment / detachment portion 15. Furthermore, the base member 134 is locked between the base holding beam portions 133 of the pair of frame bodies 131 to be erected.

[0015] Here, FIG. 5 shows the arrangement of the construction scaffold 130 around the building 140. In FIGS. 5 and 6, the building 140 is illustrated by a two-dot chain line. As shown in FIG. 5, a plurality of building frames 130a are arranged horizontally along the outer surface 142 of the building body 141 of the building 140. The building frames 130a adjacent to each other in the horizontal direction share the frame body 131 located at their boundaries. Also, the building frames 130a are arranged in a plurality of stacked layers in the vertical direction. The construction scaffold 130 is erected, for example, so as to surround the building 140 by a plurality of building frames 130a arranged in this way. The construction scaffold 130 is erected, for example, in a substantially rectangular shape in plan view.

[0016] As shown in FIGS. 4 and 5, in the case of this embodiment, the plurality of net erection jigs 10 include, in plan view, a net erection jig 10 (hereinafter referred to as the first net erection jig 11) arranged on one side with the building 140 interposed therebetween, and a net erection jig 10 (second net erection jig 12) arranged on the other side. And the first net erection jig 11 and the second net erection jig 12 are arranged to face each other with the building 140 interposed therebetween. Each net erection jig 10 is formed, for example, in the same shape and the same size as each other. The plurality of first net erection jigs 11 are arranged, for example, in a plurality of rows spaced apart from each other in the horizontal direction. Similarly, each of the plurality of second net erection jigs 12 is arranged, for example, in a plurality of rows spaced apart from each other in the horizontal direction. In this state, each first net erection jig 11 is arranged such that the support member 30 of the first net erection jig 11 is located on the building 140 side, and each second net erection jig 12 is arranged such that the support member 30 of the second net erection jig 12 is located on the building 140 side. That is, the first net erection jig 11 and the second net erection jig 12 are arranged in opposite postures to each other. Also, as shown in FIGS. 1 and 2, in the vertical direction, the upper end portions of the first net erection jigs 11 and the upper end portions of the second net erection jigs 12 are arranged, for example, at substantially the same height positions as each other. Then, as shown in FIGS. 5 and 6, among the plurality of first net erection jigs 11 and second net erection jigs 12 arranged side by side, a wire 120 is erected between one first net erection jig 11 and one second net erection jig 12 that face each other. Here, as shown in FIG. 7, the anti-scattering net 110 is suspended by, for example, a pair of wires 120, and the anti-scattering net 110 is stretched between the pair of wires 120. More specifically, one of the pair of wires 120 (hereinafter referred to as the first wire 121) by which one anti-scattering net 110 is suspended is erected between one first net erection jig 11 and one second net erection jig 12, and the other wire 120 (hereinafter referred to as the second wire 122) is erected between the first net erection jig 11 arranged adjacent to the first net erection jig 11 and the second net erection jig 12 arranged adjacent to the second net erection jig 12.

[0017] As shown in FIGS. 5, 6, and 7, in a state of being suspended by the first wire 121 and the second wire 122, each anti-scattering net 110 includes, for example, a main portion 111 that covers the upper part of the building 140, a first hanging portion 112a that hangs along the first wire 121, a first hanging portion 112b that hangs along the second wire 122, and a pair of second hanging portions 113a and 113b arranged between the first hanging portions 112a and 112b. Note that FIG. 7 shows one anti-scattering net 110 and its peripheral structure. More specifically, the anti-scattering net 110 has, for example, a main portion 111 that is substantially rectangular in plan view, a pair of first hanging portions 112a and 112b respectively connected to each end in the short side direction of the main portion 111, and a pair of second hanging portions 113a and 113b respectively connected to each end in the long side direction of the main portion 111. As shown in FIG. 7, a plurality of dove-eye holes 115 are provided at each side end portion in the short side direction of the main portion 111, and the dove-eye holes 115 are arranged at equal intervals in the longitudinal direction of the main portion 111. And an annular member 116 (see FIG. 7) is attached to each dove-eye hole 115. That is, via the dove-eye holes 115, a plurality of annular members 116 are attached to each of the side end portions in the short side direction of the main portion 111. Each annular member 116 is, for example, a C-link. The scattering prevention net 110 is attached to the wire 120 such that, for example, the longitudinal direction of the main portion 111 of the scattering prevention net 110 is along the extending direction of the wire 120. More specifically, a first wire 121 is inserted into each annular member 116 attached to one side end portion in the short side direction of the main portion 111 in the order of arrangement of the annular members 116, and a second wire 122 is inserted into each annular member 116 attached to the other side end portion in the short side direction of the main portion 111 in the order of arrangement of the annular members 116. In this way, in a state where the scattering prevention net 110 is suspended from the wire 120, one of the pair of first hanging portions 112a, 112b, i.e., the first hanging portion 112a, hangs down along the first wire 121, and the other first hanging portion 112b hangs down along the second wire 122. Also, between the first wire 121 and the second wire 122, one of the pair of second hanging portions 113a, 113b, i.e., the second hanging portion 113a, hangs down along one side end portion in the short side direction of the main portion 111, and the other second hanging portion 113a hangs down along the other side end portion in the short side direction of the main portion 111.

[0018] Two ropes 126a, 126b for opening and closing the scattering prevention net 110 are attached to the scattering prevention net 110. The ropes 126a, 126b may be inserted, for example, into the annular member 116 through which the wire 120 is inserted, or may be inserted into an annular member 116 different from the annular member 116. FIG. 7 shows an example in which ropes 126a and 126b are inserted into an annular member 116 different from the annular member 116 through which wire 120 is inserted. More specifically, a plurality of the above-described dove-eye holes 115 and a plurality of annular members 116 are respectively attached to the lower ends of the first hanging portions 112a and 112b, and the ropes 126a and 126b are inserted into the corresponding annular members 116 in the order of arrangement of the annular members 116. Each end of the ropes 126a and 126b hangs downward from the end of the anti-scattering net 110. By pulling one end of the ropes 126a and 126b toward the other end side, the anti-scattering net 110 can be closed. That is, the ropes 126a and 126b guide the respective annular members 116 to the wire 120 and pull them toward the other end side. Note that each end of the ropes 126a and 126b may be held by, for example, a construction scaffold 130 or a net erection jig 10.

[0019] As described above, the net erection jig 10 includes, for example, a horizontal member 20 detachably attached to the construction scaffold 130 by a jig attachment / detachment portion 15 in a state of extending in the horizontal direction, and a support member 30 detachably attached to the horizontal member 20 in a state of standing vertically. As shown in FIGS. 1 to 4, the horizontal member 20 has, for example, a pair of upper and lower horizontal bar-shaped portions 22 each extending horizontally, and a plurality of vertical bar-shaped portions 24 connecting the pair of horizontal bar-shaped portions 22 at a plurality of locations in the longitudinal direction of the pair of horizontal bar-shaped portions 22. The pair of horizontal bar-shaped portions 22 are attached to the construction scaffold 130 in a state of being along the outer surface 142 of the frame 141 of the structure (in this embodiment, the building 140). More specifically, in this embodiment, the attachment position of the support member 30 to the horizontal member 20 is variable in the longitudinal direction of the horizontal bar-shaped portion 22. As shown in FIGS. 8(a), 8(b), and 8(c), the pair of horizontal bar-shaped portions 22 are formed in the same shape as each other, for example. Also, each of the pair of horizontal bar-shaped portions 22 is formed in a substantially rectangular tubular shape, for example. The vertical rod-shaped portions 24 are formed, for example, in the same shape as one another. Each vertical rod-shaped portion 24 is formed, for example, in a substantially rectangular tubular shape. The pair of horizontal rod-shaped portions 22 are, for example, arranged parallel to each other, and each vertical rod-shaped portion 24 extends in a direction perpendicular to each of the pair of horizontal rod-shaped portions 22. Also, each vertical rod-shaped portion 24 is arranged at equal intervals in the longitudinal direction of the horizontal rod-shaped portion 22. In this manner, the pair of horizontal rod-shaped portions 22 and the multiple vertical rod-shaped portions 24 are welded to each other, and the horizontal member 20 is formed in an eye shape.

[0020] The horizontal rod-shaped portion 22 is attached to the construction scaffolding 130 by, for example, a jig attachment / detachment portion 15 (see FIG. 9). The jig attachment / detachment portion 15 is not particularly limited, but an example thereof is a double clamp. A double clamp is an integrated unit of two clamps, and the axial directions of one clamp and the other clamp of the double clamp are perpendicular to each other. One clamp holds the horizontal rod-shaped portion 22, and the other clamp holds the leg portion 132 of the frame body 131 of the construction scaffolding 130. In the present embodiment, the net erection jig 10 is provided with four jig attachment / detachment parts 15 (double clamps), and the four jig attachment / detachment parts 15 are attached, for example, to parts A, B, C, and D shown in Fig. 10. In this manner, the pair of horizontal rod-shaped parts 22 and the construction scaffolding 130 are connected to each other by the four double clamps (jig attachment / detachment parts 15).

[0021] As shown in FIGS. 3(a) and 3(b), the column member 30 has, for example, a pair of second vertically rod-shaped portions 32a and 32b each extending in the vertical direction, and a plurality of second horizontally rod-shaped portions 34 connecting the pair of second vertically rod-shaped portions 32a and 32b at respective multiple locations in the longitudinal direction of the pair of second vertically rod-shaped portions 32a and 32b. When the pair of second vertically rod-shaped portions 32a and 32b are in a state along the outer surface 142 of the housing 141, one of the pair of second vertically rod-shaped portions 32b is arranged at a position relatively close to the housing 141, and the other second vertically rod-shaped portion 32a of the pair of second vertically rod-shaped portions 32a and 32b is arranged at a position relatively away from the housing 141, and it is attached to the horizontal member 20. That is, in the case of the present embodiment, as shown in FIGS. 1 and 2, the column member 30 is arranged horizontally between the outer surface 142 of the housing 141 and the building frame 130a of the construction scaffold 130. The pair of second vertically rod-shaped portions 32a and 32b are, for example, formed in the same shape as each other. Also, each of the pair of second vertically rod-shaped portions 32a and 32b is, for example, formed in a substantially rectangular tube shape. The plurality of second horizontally rod-shaped portions 34 are, for example, formed in the same shape as each other. Also, the second horizontally rod-shaped portion 34 is, for example, formed in a substantially rectangular tube shape. The pair of second vertically rod-shaped portions 32a and 32b are, for example, arranged parallel to each other, and each second horizontally rod-shaped portion 34 extends in a direction orthogonal to each of the pair of second vertically rod-shaped portions 32a and 32b. Also, each second horizontally rod-shaped portion 34 is arranged at equal intervals in the longitudinal direction of the pair of second vertically rod-shaped portions 32a and 32b. In this way, the pair of second vertically rod-shaped portions 32a and 32b and the plurality of second horizontally rod-shaped portions 34 are welded to each other, and the column member 30 is formed in a square shape.

[0022] Also, in the case of the present embodiment, the column member 30 is attached to the horizontal member 20 by connecting the other second vertically rod-shaped portion 32a and the horizontal rod-shaped portion 22 with a double clamp 40 (see FIG. 9). Accordingly, by appropriately adjusting the attachment position of the first clamp 41 with respect to the horizontal bar-shaped portion 22, the attachment position of the support member 30 with respect to the horizontal member 20 can be easily changed within the range of the arrow shown in FIG. 9. However, the portion where the horizontal bar-shaped portion 22 is connected to the vertical bar-shaped portion 24 is excluded from the range of the arrow shown in FIG. 9. Also, by appropriately adjusting the attachment position of the second clamp 42 with respect to the other second vertical bar-shaped portion 32a, the attachment position of the support member 30 with respect to the horizontal member 20 can be easily changed in the vertical direction. More specifically, as shown in FIG. 1 and the like, the double clamp 40 is an integrated structure of two clamps 41 and 42. One clamp 41 (hereinafter, the first clamp 41) of the double clamp 40 and the other clamp 42 (hereinafter, the second clamp 42) are arranged such that their axial directions are orthogonal to each other. The first clamp 41 of the double clamp 40 holds, for example, the horizontal bar-shaped portion 22, and the second clamp 42 of the double clamp 40 holds the other second vertical bar-shaped portion 32a. In this way, the support member 30 is attached to the horizontal member 20. In this state, the longitudinal directions of the pair of second vertical bar-shaped portions 32a and 32b are orthogonal to, for example, the longitudinal direction of the pair of horizontal bar-shaped portions 22. Also, the axial direction of the first clamp 41 coincides with the longitudinal direction (horizontal direction) of the horizontal bar-shaped portion 22, and the axial direction of the second clamp 42 coincides with the longitudinal direction (vertical direction) of one of the second vertical bar-shaped portions 32a.

[0023] The first clamp 41 is a general angle clamp and has, for example, a first clamping portion, a second clamping portion, and a shaft support portion that pivotally supports the first clamping portion and the second clamping portion so that they can be opened and closed relative to each other. Further, it has a fastening bolt that connects the first clamping portion and the second clamping portion to each other, and a fastening nut that is screwed with the fastening bolt. The first clamp 41 is the same as the second clamp 42.

[0024] As shown in FIGS. 3(a) and 3(b), in the case of this embodiment, the other second vertical rod-shaped portion 32a and the horizontal rod-shaped portion 22 are connected to each other by two double clamps 40. As an example, the two double clamps 40 are respectively attached to the E portion and the F portion shown in FIG. 10 on the horizontal rod-shaped portion 22, for example. The two double clamps 40 are detachably attached to the horizontal member 20 and the second vertical rod-shaped portion 32a, respectively, in a state of being separated from each other in the longitudinal direction of the second vertical rod-shaped portion 32a. More specifically, the first clamp 41 of one of the two double clamps 40 holds one of the pair of horizontal rod-shaped portions 22, and the first clamp 41 of the other double clamp 40 holds the other horizontal rod-shaped portion 22 of the pair of horizontal rod-shaped portions 22. Also, the second clamp 42 of the one double clamp 40 and the second clamp 42 of the other double clamp 40 hold the other second vertical rod-shaped portion 32a, respectively.

[0025] Here, in the case of this embodiment, the jig 10 for net installation is configured to hold the wire 120 at the upper end portion 30a of the column member 30, and the attachment position of the column member 30 to the horizontal member 20 is variable in the horizontal direction. More specifically, in the case of this embodiment, as shown in FIGS. 5 and 6, in a plan view, among the first net installation jig 11 and the second net installation jig 12 that face each other with the building 140 interposed therebetween, one end of the first wire 121 is held at the upper end portion 30a of the column member 30 of the first net installation jig 11, and the other end of the first wire 121 is held at the upper end portion 30a of the column member 30 of the second net installation jig 12. Similarly, in a plan view, among the first net installation jig 11 and the second net installation jig 12 that face each other with the building 140 interposed therebetween, one end portion of the second wire 122 is held at the upper end portion 30a of the column member 30 of the first net installation jig 11, and the other end portion of the second wire 122 is held at the upper end portion 30a of the column member 30 of the second net installation jig 12. Here, the first wire 121 and the second wire 122 from which a single splash prevention net 110 is suspended are preferably installed in a state of extending parallel to each other in the horizontal direction, for example. By doing so, the splash prevention net 110 can be suspended from the wires 120 (the first wire 121 and the second wire 122) so as to be substantially rectangular in plan view. Therefore, when opening and closing the splash prevention net 110, one end of each of the ropes 126a and 126b can be smoothly pulled along the wire 120 to the other end side of the ropes 126a and 126b. And according to the above-described configuration, by adjusting the attachment position of the support member 30 with respect to the horizontal member 20 in the horizontal direction, the extending direction of the wire 120 can be adjusted. For this reason, for example, even if the building frame 130a to which the first net installation jig 11 is attached and the building frame 130a to which the second net installation jig 12 facing the first net installation jig 11 is attached are not symmetrically arranged with respect to the building 140, the support member 30 of the first net installation jig 11 and the support member 30 of the second net installation jig 12 can be arranged at symmetric positions with respect to the building 140. Therefore, the first wire 121 and the second wire 122 from which a single splash prevention net 110 is suspended can be installed in a state of extending parallel to each other in the horizontal direction.

[0026] Here, the support member 30 is formed, for example, by connecting a plurality of unit structures 31 having the same shape and the same size as the horizontal member 20 in the longitudinal direction. Therefore, the unit structure 31 is formed in the same shape as the horizontal member 20 shown in FIGS. 8(a) to 8(c). More specifically, the horizontal member 20 is detachably attached to the construction scaffold 130 in a state of extending in the horizontal direction, while the unit structure 31 is detachably attached to the horizontal member 20, for example, in a state of being erected vertically. Therefore, the unit structure 31 has, for example, a pair of third vertically extending rod-shaped portions 31a that each extend vertically, and a plurality of third horizontally extending rod-shaped portions 31b that connect the pair of third vertically extending rod-shaped portions 31a to each other at each of a plurality of locations in the longitudinal direction of the pair of third vertically extending rod-shaped portions 31a. And a pair of second vertically extending rod-shaped portions 32a, 32b of the support member 30 are configured by connecting a plurality of the pair of third vertically extending rod-shaped portions 31a of the unit structure 31 in the longitudinal direction. Further, each second horizontally extending rod-shaped portion 34 of the support member 30 is constituted by the third horizontally extending rod-shaped portion 31b of the unit structure 31.

[0027] In the case of this embodiment, as shown in FIG. 11, each unit structure 31 is connected to each other by a connecting member 60. As shown in FIGS. 12(a), 12(b), and 12(c), the connecting member 60 has, for example, a pair of cylindrical portions 61, 62 and a connecting portion 64 that connects the pair of cylindrical portions 61, 62 to each other. Each of the pair of cylindrical portions 61, 62 is formed, for example, in the same shape as each other. Further, each of the pair of cylindrical portions 61, 62 is formed, for example, in a cylindrical shape with the vertical direction as the axial direction. The upper end portion of each of the pair of cylindrical portions 61, 62 is chamfered by caulking, for example, and the diameter is reduced upward, and the lower end portion of each of the pair of cylindrical portions 61, 62 is chamfered by caulking, for example, and the diameter is reduced downward. Also, the upper end of the cylindrical portion 61 is disposed above the upper end of the cylindrical portion 62. The connecting portion 64 has, for example, a pair of plate-like portions 65a, 65b (see FIGS. 12(b), etc.), and the pair of plate-like portions 65a, 65b are assembled to each other to be configured. The pair of plate-like portions 65a, 65b are fixed to each other by welding, for example. Each of the pair of plate-like portions 65a, 65b is formed, for example, in the same shape as each other. Each of the pair of plate-like portions 65a, 65b is, for example, a plate-like portion curved in a substantially L shape, and is formed in a substantially rectangular cylindrical shape by being assembled to each other in a posture that is vertically inverted with respect to each other. More specifically, each of the pair of plate-like portions 65a and 65b has a horizontal portion 67a with each plate surface facing the vertical direction, and a vertical portion 67b that is connected to the horizontal portion 67a and has each plate surface facing the horizontal direction. As shown in FIGS. 12(a) and 12(b), each of the pair of plate-like portions 65a and 65b is formed, for example, in a rectangular shape that is long in one direction. The dimension of the horizontal portion 67a in the length direction is larger than the dimension of the vertical portion 67b in the length direction, for example. Also, the vertical portion 67b is connected to the central portion in the length direction of the horizontal portion 67a. As shown in FIGS. 12(b) and 12(c), for example, the horizontal portion 67a of one of the pair of plate-like portions 65a and 65b and the horizontal portion 67a of the other plate-like portion 65b are arranged parallel to and facing each other, and the vertical portion 67b of the one plate-like portion 65b and the vertical portion 67b of the other plate-like portion 65b are arranged parallel to and facing each other. In addition, each of the pair of plate-like portions 65a and 65b has a pair of fitting holes 66b and 66c, and a pair of cylindrical portions 61 and 62 are respectively fitted into the corresponding fitting holes 66b and 66c. More specifically, the fitting holes 66b and 66c are through holes that penetrate the horizontal portion 67a in the thickness direction (vertical direction). The fitting hole 66b is formed at one end of the horizontal portion 67a in the length direction, and the fitting hole 66c is formed at the other end of the horizontal portion 67a in the length direction. The fitting hole 66b of one of the plate-like portions 65a and the fitting hole 66b of the other plate-like portion 65a are arranged coaxially with each other. Then, one of the pair of cylindrical portions 61 and 62, i.e., one cylindrical portion 61, is welded in a state of being inserted into each of the fitting hole 66b of one of the plate-like portions 65a and the fitting hole 66b of the other plate-like portion 65a. Similarly, the fitting hole 66c of one of the plate-like portions 65a and the fitting hole 66c of the other plate-like portion 65a are arranged coaxially with each other. Then, one of the pair of cylindrical portions 61 and 62, i.e., one cylindrical portion 62, is welded in a state of being inserted into each of the fitting hole 66c of one of the plate-like portions 65a and the fitting hole 66c of the other plate-like portion 65a. In addition, through-holes penetrating in the thickness direction are formed in the horizontal portions 67a of the pair of plate-like portions 65a and 65b, and nuts 68 are welded at positions corresponding to the through-holes.

[0028] In the case of this embodiment, the unit structures 31 adjacent to each other vertically are connected to each other as follows, for example. One connecting member 60 is attached to the lower end portion of the upper unit structure 31 among the unit structures 31 adjacent to each other vertically, and the connecting member 60 is attached to the upper end portion of the lower unit structure 31 among the adjacent unit structures 31. In this way, the plurality of unit structures 31 are vertically connected to each other via the connecting member 60. More specifically, as shown in FIG. 11, the upper end portions of the pair of cylindrical portions 61 and 62 are respectively inserted into the inner cavities of the pair of third vertical rod-like portions 31a of the upper unit structure 31, and the lower end portions of the pair of cylindrical portions 61 and 62 are respectively inserted into the inner cavities of the pair of third vertical rod-like portions 31a of the lower unit structure 31. In this state, the pair of third vertical rod-like portions 31a of each unit structure 31 are arranged coaxially with each other. Here, in the plurality of third horizontal rod-like portions 31b, a pair of first insertion holes 35a and 35b penetrating the plurality of third horizontal rod-like portions 31b in the vertical direction are formed in the third horizontal rod-like portion 31b arranged at the uppermost side and the third horizontal rod-like portion 31b arranged at the lowermost side, respectively. Insertion bolts 69 are respectively inserted into the pair of first insertion holes 35a and 35 of the third horizontal rod-like portion 31b arranged at the lowermost side in the upper unit structure 31, and further, by screwing the insertion bolts 69 into the nuts 68 of the connecting member 60, the connecting portion 64 of the connecting member 60 is fixed to the lower end portion of the unit structure 31. Similarly, insertion bolts 69 are respectively inserted into the pair of first insertion holes 35a and 35 of the third horizontal rod-like portion 31b arranged at the uppermost side in the lower unit structure 31, and further, by screwing the insertion bolts 69 into the nuts 68 of the connecting member 60, the connecting portion 64 of the connecting member 60 is fixed to the upper end portion of the unit structure 31. In this way, the plurality of unit structures 31 are vertically connected to each other via the connecting member 60.

[0029] Also, as shown in FIG. 4, in the case of this embodiment, one horizontal member 20 is attached to one unit structure 31. More specifically, the net erection jig 10 includes a plurality of horizontal members 20 whose vertical positions are different from each other, and each horizontal member 20 is attached to each formwork 130a arranged in a stacked manner in the vertical direction, for example. And each unit structure 31 will be attached to each of the horizontal members 20 arranged in this way. However, the number of the horizontal members 20 included in the net erection jig 10 is not particularly limited, and can be appropriately set according to the height dimension of the construction scaffold 130 and the progress of the dismantling work. In FIGS. 1 and 3(a), as an example, a state is shown in which a horizontal member 20 is attached to each of the unit structures 31 from the third stage downward among the plurality of unit structures 31. Also, in FIGS. 2 and 3(b), as an example, a state is shown in which one horizontal member 20 is attached to each of all the unit structures 31, and the height position of the construction scaffold 130 is set at a position lower than the state shown in FIG. 3(a). In this way, in the case of this embodiment, the net erection jig 10 can be attached to the construction scaffold 130 so that the net erection jig 10 is arranged at a desired height position regardless of the height dimension of the construction scaffold 130.

[0030] In the case of this embodiment, the number of the unit structures 31 included in the net erection jig 10 is, as an example, five. Therefore, the number of the connecting members 60 for connecting the five unit structures 31 to each other is, as an example, four. However, in the present invention, the number of the unit structures 31 and the number of the connecting members 60 included in the net erection jig 10 are not particularly limited, and can be appropriately set according to the height of the construction scaffold 130 to which it is attached and the desired height position of the wire 120. Also, for example, a plurality of net erection jigs 10 may have different numbers of unit structures 31 and connecting members 60.

[0031] The dimension of the horizontal member 20 (unit structure 31) in the longitudinal direction is not particularly limited, but for example, it is preferably 100 cm or more and 300 cm or less. The dimension of the horizontal member 20 (unit structure 31) in the short transverse direction is not particularly limited, but for example, it is preferably 20 cm or more and 40 cm or less. The dimension of the support member 30 in the longitudinal direction is not particularly limited, but for example, it is preferably 700 cm or more and 1700 cm or less.

[0032] Further, the net erection jig 10 includes, for example, a wire hanger 50 (see FIG. 13 etc.) attached to the upper end portion 30a of the support member 30. In FIGS. 9 and 18, the illustration of the wire hanger 50 is omitted. As shown in FIGS. 14(a), 14(b) and 14(c), the wire hanger 50 has, for example, pulleys 52a, 52b with which a wire 120 engages, and the wire 120 can be erected between the pulleys 52a, 52b of the wire hangers 50 of a plurality of net erection jigs 10. In FIGS. 14(a) and 14(c), the wire 120 is illustrated by a two-dot chain line. Thereby, when the wire 120 is erected between the net erection jigs 10, the tension state of the wire 120 can be adjusted well. In the case of this embodiment, among the plurality of unit structures 31 constituting the support member 30, the upper end portion of the unit structure 31 arranged at the uppermost side constitutes the upper end portion 30a of the support member 30. That is, the wire hanger 50 is attached to the upper end portion of the unit structure 31 arranged at the uppermost side.

[0033] Also, in the case of this embodiment, as shown in FIGS. 5 and 6, two wires 120 can be attached to one net erection jig 10 by means of a wire hanger 50. One end of one of the two wires 120 attached to one net erection jig 10 engages with a pulley 52a, and one end of the other wire 120 engages with a pulley 52b. Note that in FIG. 7, the illustration of one of the two wires 120 attached to one net erection jig 10 is omitted. Then, as shown in FIG. 5, by attaching two wires 120 to each net erection jig 10, a plurality of anti-scattering nets 110 can be installed well. More specifically, in the case of this embodiment, two wires 120 are installed between one first net erection jig 11 and one second net erection jig 12. And an anti-scattering net 110 is suspended from one of the two wires 120 installed between one first net erection jig 11 and one second net erection jig 12, and another anti-scattering net 110 different from the said anti-scattering net 110 is also suspended from the other wire 120. In this state, along the said one wire 120, the first hanging part 112b of the net erection device 100 hangs down, and along the said other wire 120, the first hanging part 112a of another net erection device 100 different from the said net erection device 100 hangs down. By doing so, even if there is a gap between adjacent anti-scattering nets 110 in plan view, the disassembled materials that are about to scatter during the disassembly work can be captured by the first hanging parts 112a and 112b. Also, since the outermost first hanging parts 112a and 112b among the plurality of first hanging parts 112a and 112b, and the plurality of second hanging parts 113a and 113b are arranged so as to surround the building 140, it is possible to more surely suppress the disassembled materials from scattering outside the building 140.

[0034] The wire hanger 50 further includes, for example, a pair of fitting portions 53a and 53b that are respectively fitted into a pair of second vertical rod-shaped portions 32a and 32b, a connecting portion 51 that connects the pair of fitting portions 53a and 53b to each other, and brackets 55a and 55b that respectively hold pulleys 52a and 52b. The connecting portion 51 is formed, for example, in a substantially rectangular cylindrical shape extending in the horizontal direction. Also, an annular portion 54 is provided, for example, at the central portion in the longitudinal direction of the connecting portion 51. The pair of fitting portions 53a and 53b are formed, for example, in the same shape as each other. More specifically, each of the pair of fitting portions 53a and 53b is formed, for example, in a cylindrical shape protruding downward. Of the pair of fitting portions 53a and 53b, one fitting portion 53a protrudes downward from the lower surface of one end portion in the length direction of the connecting portion 51, and the other fitting portion 53a protrudes downward from the lower surface of the other end portion in the length direction of the connecting portion 51. The pair of fitting portions 53a and 53b are fixed to the connecting portion 51, for example, by welding. Also, the lower end portion of each of the pair of fitting portions 53a and 53b is chamfered, for example, by caulking and the diameter is reduced downward. The brackets 55a and 55b are plate-shaped portions formed, for example, in an inverted U shape that curves upward. And the bracket 55a sandwiches the pulley 52a, and the bracket 55b sandwiches the pulley 52b. More specifically, the bracket 55a is provided with, for example, a shaft support portion 57a, and the pulley 52a is rotatably supported by the bracket 55a by the shaft support portion 57a. Similarly, the bracket 55b is provided with, for example, a shaft support portion 57b, and the pulley 52b is rotatably supported by the bracket 55b by the shaft support portion 57b. And the pulleys 52a and 52b are arranged coaxially with each other. The axial direction of the pulleys 52a and 52b is orthogonal to the longitudinal direction of the connecting portion 51. Also, as shown in FIG. 13, brackets 55a and 55b are fixed by welding, for example, to the end portions of the connecting portion 51 that are located closer to the housing 141 among the end portions in the longitudinal direction. Therefore, each of the pulleys 52a and 52b is provided at the end portion of the connecting portion 51 that is located closer to the housing 141 among the end portions in the longitudinal direction.

[0035] As shown in FIG. 13, one of the pair of fitting portions 53a and 53b, i.e., fitting portion 53a, is inserted into the inner cavity of one of the second vertical rod-shaped portions 32a, and the other fitting portion 54b is inserted into the inner cavity of the other second vertical rod-shaped portion 32b, whereby the wire hanger 50 is attached to the upper end portion 30a of the support member 30. More specifically, the pulley 52b of the wire hanger 50 attached to the first net erection jig 11 and the pulley 52a of the wire hanger 50 attached to the second net erection jig 12 are arranged to face each other via the building 140, and the wire 120 is engaged with each of the pulleys 52a and 52b. Similarly, the pulley 52a of the wire hanger 50 attached to the first net erection jig 11 and the pulley 52b of the wire hanger 50 attached to the second net erection jig 12 are arranged to face each other via the building 140, and the wire 120 is engaged with each of the pulleys 52a and 52b. Here, the separation distance between the pulley 52a and the pulley 52b in the axial direction is preferably substantially equal to or less than the length dimension of the pulley 52a (pulley 52b) in the axial direction, for example. By doing so, the separation distance between the wire 120 engaged with the pulley 52a and the wire 120 engaged with the pulley 52b can be reduced, so that the gap between a plurality of anti-scattering nets 110 adjacent to each other in plan view can be made smaller. Therefore, the disassembled materials that tend to scatter during the disassembly work can be more reliably captured by the anti-scattering net 110.

[0036] In addition, the net erection device 100 includes, for example, a holding mechanism 90 (see FIG. 15) that holds one end of the wire 120 and is detachably attached to the construction scaffold 130. More specifically, in the case of the present embodiment, one end of the wire 120 extends further downward toward the holding mechanism 90 in a state of being locked to the wire hanger 50 (see FIG. 13). The holding mechanism 90 is, as an example, a lever block (registered trademark). The holding mechanism 90 includes, for example, a chain 91, a first hook portion 92 fixed to one end of the chain 91, an operation portion 94 for adjusting the length of the chain 91, and a second hook portion 93 provided on the operation portion 94. In the case of the present embodiment, a clip member 96 (see FIG. 15) is fixed to one end of the wire 120. The clip member 96 is, as an example, a Kitto clip (registered trademark). The clip member 96 is provided with an annular portion, and the first hook portion 92 of the holding mechanism 90 is locked to the annular portion. By adjusting the length of the chain 91 from the operation portion 94 to the first hook portion 92, one end of the wire 120 can be pulled toward the holding mechanism 90 (downward) to apply tension, or one end of the wire 120 can be extended to the side opposite to the holding mechanism 90 (upward) to be relaxed. In addition, the net erection device 100 includes a first locking member 95 to which the second hook portion 93 of the holding mechanism 90 is locked. The first locking member 95 is formed, for example, in a substantially semi-elliptical annular shape, is externally inserted into any one of the plurality of second horizontal bar-shaped portions 34, and the second hook portion 93 of the holding mechanism 90 is locked thereto. Thereby, it is possible to prevent the holding mechanism 90 from being pulled upward by the tension of the wire 120. That is, the wire 120 can be preferably pulled to apply tension. The first locking member 95 is, as an example, a shackle. In the case of this embodiment, as an example, among the first net erection jig 11 and the second net erection jig 12 arranged to face each other, a holding mechanism 90 for holding one end of the wire 120 is attached to the second net erection jig 12, and the other end of the wire 120 is fixed to the first net erection jig 11 by a fixing member (not shown). Then, the tension applied to the wire 120 can be adjusted by the holding mechanism 90 attached to the second net erection jig 12.

[0037] In the case of this embodiment, the net erection device 100 includes a cable body feeding mechanism 70 (see FIG. 16) capable of feeding out a cable body 71 that supports the column member 30 in a state of being removed from the horizontal member 20, and a guide mechanism 80 (see FIG. 18) that guides the column member 30 in a state of being removed from the horizontal member 20 up and down. And the guide mechanism 80 is detachably attached to the horizontal member 20, and the cable body feeding mechanism 70 is detachably attached to the construction scaffold 130. More specifically, as shown in FIGS. 1 and 2, when shifting the floor that is disassembled as the disassembly work progresses to the lower floor, it is necessary to lower the height position of the anti-scattering net 110. And according to the above configuration, as shown in FIGS. 1 and 2, since the column member 30 in a state of being removed from the horizontal member 20 can be guided downward by the guide mechanism 80, the height position of the anti-scattering net 110 can be adjusted smoothly. More specifically, the double clamp 40 connecting the horizontal member 20 and the column member 30 is removed from the horizontal member 20 and the column member 30, and instead, the guide mechanism 80 is attached to the horizontal bar-shaped portion 22. Then, the column member 30 in a state of being removed from the horizontal member 20 can be smoothly guided downward by the guide mechanism 80. Note that in the case of this embodiment, one guide mechanism 80 is attached to each of the plurality of horizontal members 20 included in one net erection jig 10. In addition, since the guide mechanism 80 can smoothly guide the column member 30 in the vertical direction in a state where it is removed from the horizontal member 20, the height position of the upper end portion 30a of the column member 30 of the first net erection jig 11 and the height position of the upper end portion 30a of the column member 30 of the second net erection jig 12 facing the first net erection jig 11 can be easily aligned.

[0038] As shown in FIG. 16, for example, the cord-like body feeding mechanism 70 supports the column member 30 via a mounting fitting 76 attached to the lower end portion 30b of the column member 30. More specifically, the cord-like body feeding mechanism 70 includes a main body portion 70a from which the cord-like body 71 is fed out, and a hook portion 72 provided at one end of the cord-like body 71. Note that the cord-like body 71 is not particularly limited, and examples thereof include a chain, a wire, and a rope. Also, as shown in FIGS. 17(a) and 17(b), the mounting fitting 76 has, for example, a bifurcated portion 77 which is a plate-like portion curved in a substantially U shape, and a plate-like portion 78 hanging down from the lower surface of the bifurcated portion 77. For example, a pair of insertion holes 76a penetrating the bifurcated portion 77 are formed in the bifurcated portion 77. Also, for example, a locking hole 76b penetrating the plate-like portion 78 is formed in the plate-like portion 78. Here, a pair of second insertion holes 36a penetrating the second vertical rod-shaped portion 32a in the thickness direction are formed at the lower end portion of the other second vertical rod-shaped portion 32a. Then, with the bifurcated portion 77 arranged to sandwich the lower end portion of the other second vertical rod-shaped portion 32a, the mounting fitting 76 can be fixed to the column member 30 by inserting insertion bolts (not shown) into each of the insertion holes 76a of the bifurcated portion 77 and the pair of second insertion holes 36a of the second vertical rod-shaped portion 32b. Also, a second locking member 75 to which the hook portion 72 of the cord-like body feeding mechanism 70 is locked is attached to the locking hole 76b of the plate-like portion 78. In this way, the cable feeding mechanism 70 supports the support member 30 via the mounting fitting 76. Thus, when the support member 30 is attached to the horizontal member 20, the lower end portion 30b of the support member 30 is well supported by the cable feeding mechanism 70. Further, when guiding the support member 30 in the up-and-down direction in a state where it is removed from the horizontal member 20, by adjusting the length of the cable 71 from the main body portion 70a to the hook portion 72, the cable feeding mechanism 70 can safely move the support member 30 up and down while supporting the lower end portion 30b of the support member 30. Further, the cable feeding mechanism 70 is suspended, for example, by the mounting member 73 from the base holding beam portion 133 of the frame body 131.

[0039] The guide mechanism 80 includes, for example, a pair of guide members 82a and 82b that are detachably attached to the horizontal member 20 in a state of being spaced apart from each other in the longitudinal direction of the horizontal bar-shaped portion 22, and rollers 84a and 84b that are spanned between the pair of guide members 82a and 82b so as to be parallel to the horizontal bar-shaped portion 22. Then, with the support member 30 passed through the space 80a surrounded by the pair of guide members 82a and 82b, the rollers 84a and 84b, and the horizontal bar-shaped portion 22, the guide mechanism 80 guides the support member 30 up and down. Thereby, the support member 30 in a state of being removed from the horizontal member 20 can be displaced up and down safely and smoothly.

[0040] As shown in FIGS. 18, 19(a), and 19(b), one of the guide members 82a includes a pair of upper and lower clamps 85a and 85b that are detachably attached to the pair of upper and lower horizontal bar-shaped portions 22 respectively, a first plate-shaped portion 87a to which the pair of upper and lower clamps 85a and 85b are fixed, and a second plate-shaped portion 87b that reinforces the first plate-shaped portion 87a. The first plate-like portion 87a is, for example, a plate-like portion that is curved in a substantially L shape in a plan view, and has a first portion whose each plate surface faces the longitudinal direction of the second horizontal rod-like portion 34, and a second portion that is connected to the first portion and whose each plate surface faces the longitudinal direction of the horizontal rod-like portion 22. The second plate-like portion 87b is, for example, a plate-like portion whose each plate surface faces the vertical direction. The second plate-like portion 87b is, for example, formed in a substantially right-angled triangle shape in a plan view, and one of the two sides excluding the hypotenuse is connected to the first portion of the first plate-like portion 87a, and the other side is connected to the second portion of the second plate-like portion 87b. In this way, since the second plate-like portion 87b is orthogonal to each of the first portion and the second portion of the first plate-like portion 87a, the first plate-like portion 87a is reinforced by the second plate-like portion 87b, and the structural strength of the guide mechanism 80 can be sufficiently ensured. The pair of upper and lower clamps 85a and 85b are, for example, clamps similar to the first clamp 41 of the double clamp 40. One of the pair of upper and lower clamps 85a and 85b holds one of the pair of upper and lower horizontal rod-like portions 22, and the other clamp 85b holds the other horizontal rod-like portion 22. The pair of upper and lower clamps 85a and 85b are, for example, fixed to the first portion of the first plate-like portion 87a in a state of being separated from each other in the vertical direction. As an example, each of the pair of upper and lower clamps 85a and 85b is fixed to the first portion by an insertion bolt and a lock nut. The other guide member 82b is formed in a symmetrical shape with the one guide member 82a with reference to the rollers 84a and 84b. Therefore, the other guide member 82b has the pair of upper and lower clamps 85a and 85b, the first plate-like portion 87a, and the second plate-like portion 87b. Here, as shown in FIG. 19(b), in the first plate-like portion 87a, notch-shaped portions 89a and 89b are formed at the end portions on the side opposite to the horizontal member 20 side. Each of the rollers 84a and 84b is rotatably supported by the notch-shaped portions 89a and 89b in a state of extending along the longitudinal direction of the horizontal rod-like portion 22. When the rollers 84a and 84b come into contact with the support member 30, the support member 30 will be smoothly guided vertically.

[0041] In the case of this embodiment, in a state where the guide mechanism 80 is attached to the horizontal member 20, each of the pair of clamps 85a and 85b of one guide member 82a and each of the pair of clamps 85a and 85b of the other guide member 82a are spaced apart from each other in the longitudinal direction of the horizontal bar-shaped portion 22. And the inner surface of the first plate-shaped portion 87a of one guide member 82a and the inner surface of the first plate-shaped portion 87a of the other guide member 82b are arranged in a parallel and opposed state to each other. In this state, one end portion of each of the rollers 84a and 84b is inserted into the notch-shaped portions 89a and 89b of the first plate-shaped portion 87a of one guide member 82a, one end portion of each of the rollers 84a and 84b is fixed to the notch-shaped portions 89a and 89b of the first plate-shaped portion 87a of one guide member 82a, and the other end portion of each of the rollers 84a and 84b is fixed to the notch-shaped portions 89a and 89b of the first plate-shaped portion 87a of the other guide member 82a. In this way, the rollers 84a and 84b are bridged between the pair of guide members 82a and 82b, and the pair of guide members 82a and 82b are connected to each other by the rollers 84a and 84b. And in the case of this embodiment, the space 80a is defined by the inner surface of the first plate-shaped portion 87a of one guide member 82a, the inner surface of the first plate-shaped portion 87a of the other guide member 82b, a part of the outer surface (the surface opposite to the housing 141 side) of each of the pair of upper and lower horizontal bar-shaped portions 22, and the rollers 84a and 84b. More specifically, the support member 30 is arranged between the first plate-shaped portion 87a of one guide member 82a and the first plate-shaped portion 87a of the other guide member 82b in the longitudinal direction of the horizontal bar-shaped portion 22, and is arranged between the pair of upper and lower horizontal bar-shaped portions 22 and the rollers 84a and 84b in the longitudinal direction of the second horizontal bar-shaped portion 34. According to the above configuration, by removing the rollers 84a and 84b from each of the pair of guide members 82a and 82b, the connection between the pair of guide members 82a and 82b can be easily released. Therefore, the guide mechanism 80 can be easily removed from the support member 30 at any position in the longitudinal direction of the support member 30.

[0042] <Modification Example 1> Next, a first modification of the embodiment will be described with reference to FIGS. 20, 21(a), and 21(b). In FIG. 20, the construction scaffold 130 is illustrated by a two-dot chain line. Also, in FIG. 20, the illustration of the wire hanger 50 is omitted. The net erection device 100 according to this modification is different from the net erection device 100 according to the above embodiment in the points described below, and is configured in the same manner as the net erection device 100 according to the above embodiment in other points.

[0043] In the embodiment, an example in which the guide mechanism 80 includes a pair of guide members 82a and 82b and rollers 84 has been described. However, in the case of this modification, the guide mechanism 80 does not include the above-described pair of guide members 82a and 82b and rollers 84, and instead includes a clamp 85a that is detachably attached to the horizontal member 20, and a bifurcated portion 88 that guides the support member 30 vertically. Thereby, the guide mechanism 80 according to this modification can be set to a smaller size than the guide mechanism 80 according to the embodiment. Therefore, for example, when the guide mechanism 80 according to the embodiment cannot be used due to reasons such as space, the support member 30 can be guided vertically by the guide mechanism 80 according to this modification. More specifically, as shown in FIGS. 21(a) and 21(b), the clamp 85a is a general clamp, for example, similar to the clamp 85a of the guide mechanism 80 in the embodiment. The bifurcated portion 88 is, for example, a plate-shaped portion curved in a substantially U shape in plan view, and has a pair of opposing portions 88a facing each other. And the substantially U-shaped bifurcated portion 88 is open toward the side opposite to the horizontal member 20 side. And as shown in FIG. 20, one of the second vertical rod-shaped portions 32a is disposed between the pair of opposing portions 88a of the bifurcated portion 88, and the second vertical rod-shaped portion 32a is vertically guided by the bifurcated portion 88. According to the above-described configuration, when the guiding of the column member 30 by the guiding mechanism 80 is completed, the guiding mechanism 80 can be quickly removed from the horizontal member 20. When the column member 30 is vertically guided by the guiding mechanism 80, for example, in order to suppress the dropping in the direction away from the construction scaffold 130, it is preferable that the other second vertical rod-shaped portion 32b is supported by the worker.

[0044] In the case of this modification example, as an example, the column member 30 is vertically guided by two guiding mechanisms 80. The clamp 85a included in one of the two guiding mechanisms 80 and the clamp 85a included in the other guiding mechanism 80 are attached to the horizontal member 20 in a state of being separated from each other in the length direction of the vertical rod-shaped portion 24. More specifically, the clamp 85a included in one of the two guiding mechanisms 80 is attached to one of the pair of upper and lower horizontal rod-shaped portions 22, and the clamp 85a included in the other guiding mechanism 80 is attached to the other of the pair of upper and lower horizontal rod-shaped portions 22. In this state, the bifurcated portion 88 included in the one guiding mechanism 80 and the bifurcated portion 88 included in the other guiding mechanism 80 support portions of the one second vertical rod-shaped portion 32a that are separated from each other in the vertical direction. For this reason, the column member 30 can be vertically guided in a more stable state.

[0045] <Modification Example 2> Next, a second modification example of the embodiment will be described with reference to FIGS. 22 to 24(d). In FIG. 22, the illustration of the horizontal member 20 is omitted. The net erection device 100 according to this modification is different from the net erection devices 100 according to the above-described embodiment and Modification 1 in the points described below, and is configured in the same manner as the net erection devices 100 according to the above-described embodiment and Modification 1 in other points.

[0046] In the case of this modification, the net erection device 100 includes an assembling member 210 for assembling a pair of column members 30 to each other. Then, the pair of column members 30 assembled to each other via the assembling member 210 are attached to a common horizontal member 20, and the wire hanger 50 is installed between the upper end portions of the pair of column members 30. Thereby, the structural strength of the net erection jig 10 can be improved, and one end portion of the wire 120 can be engaged between the upper end portions of the pair of column members 30.

[0047] As shown in FIGS. 24(a), 24(b), and 24(c), the assembling member 210 has, for example, a pair of support portions 211a and 211b that respectively support the pair of column members 30, and a pair of connecting portions 212a and 212b that connect the pair of support portions 211a and 211b to each other. Each of the pair of support portions 211a and 211b is, for example, formed to be long in one direction and is a plate-like portion curved in a substantially U shape. More specifically, each of the pair of support portions 211a and 211b is open upward. Also, each of the pair of support portions 211a and 211b is arranged parallel to and spaced apart from each other. Each of the pair of connecting portions 212a and 212b is, for example, formed in a substantially rectangular tube shape. Each of the pair of connecting portions 212a and 212b is arranged parallel to and spaced apart from each other. Each of the pair of support portions 211a and 211b extends, for example, along the longitudinal direction of the second horizontal bar-shaped portion 34, and each of the pair of connecting portions 212a and 212b extends, for example, along the longitudinal direction of the horizontal bar-shaped portion 22. That is, each of the pair of support portions 211a and 211b is orthogonal to each of the pair of connecting portions 212a and 212b. As shown in FIG. 22, inside one of the pair of support portions 211a and 211b, the second horizontal bar-shaped portion 34, which is located at the uppermost position in one of the pair of support column members 30, is disposed, and inside the other support portion 211b, the second horizontal bar-shaped portion 34, which is located at the uppermost position in the other support column member 30 of the pair of support column members 30, is inserted. Here, the assembling member 210 further includes a pair of insertion bolts 214a and 214b, and a pair of lock nuts 213a and 213b that are screwed to the tip ends of the respective insertion bolts 214a and 214b. One of the pair of insertion bolts 214a and 214b, i.e., the insertion bolt 214a, is inserted in this order from the surface of one support portion 211a on the side opposite to the other support portion 211b side through the one support portion 211a, the second horizontal bar-shaped portion 34 of the one support column member 30, one connecting portion 212a, the other support portion 211b, and the second horizontal bar-shaped portion 34 of the other support column member 30. Further, the other insertion bolt 214b of the pair of insertion bolts 214a and 214b is inserted in this order from the surface of one support portion 211a on the side opposite to the other support portion 211b side through the one support portion 211a, the second horizontal bar-shaped portion 34 of the one support column member 30, the other connecting portion 212b, the other support portion 211b, and the second horizontal bar-shaped portion 34 of the other support column member 30. In this way, the pair of support column members 30 are assembled to each other via the assembling member 210. In this state, the second horizontal bar-shaped portion 34 of one support column member 30 and the second horizontal bar-shaped portion 34 of the other support column member 30 are arranged parallel to each other and are orthogonal to the longitudinal direction of the horizontal member 20.

[0048] Also, in the case of this modification example, as shown in FIG. 22, in the longitudinal direction of the horizontal member 20, the length dimension of the connecting portion 51 of the wire hanger 50 is set to a dimension slightly larger than the length dimension of the assembling member 210. Then, the fitting portion 53a of the wire hanger 50 is inserted into one second vertical rod-shaped portion 32b of the one support member 30, and the fitting portion 53a of the wire hanger 50 is inserted into one second vertical rod-shaped portion 32b of the other support member 30. In this state, the longitudinal direction of the wire hanger 50 is orthogonal to the longitudinal direction of the second horizontal rod-shaped portion 34. And, as shown in FIGS. 23(a), 23(b), and 23(c), brackets 55a and 55b are provided on the surface of the connecting portion 51 on the side opposite to the assembling member 210 side, and pulleys 52a and 52b are attached.

[0049] <Modification Example 3> Next, a third modification example of the embodiment will be described with reference to FIGS. 25(a) to 27(e). Note that FIG. 26(b) shows a state in which the first-stage building frame 130a and the second-stage building frame 130a from the top are removed from the state shown in FIG. 26(a). FIG. 27(c) shows a state in which a guide mechanism 80 is attached to the horizontal member 20 instead of the double clamp 40 from the state shown in FIG. 26(b). FIG. 27(d) shows a state in which the support member 30 is arranged at a position lower than the state shown in FIG. 27(c). FIG. 27(e) shows a state in which the splash-preventing net 110 is suspended at a position lower than the state shown in FIG. 27(d). The net erection device 100 according to this modification example is different from the net erection devices 100 according to the above-described embodiment and modification examples 1 and 2 in the points described below, and is configured in the same manner as the net erection devices 100 according to the above-described embodiment and modification examples 1 and 2 in other points.

[0050] As shown in FIGS. 25(a), 25(b), and 25(c), in the case of this modification example, the net erection device 100 further includes a reinforcing member 220 that reinforces the unit structures 31 adjacent to each other vertically. As a result, the state in which a plurality of unit structures 31 are connected in the longitudinal direction can be maintained well, so that the structural strength of the support member 30 can be ensured sufficiently.

[0051] As shown in FIGS. 25(b) and 25(c), the reinforcing member 220 includes, for example, a pair of upper and lower clamps 222 that are detachably attached to the third vertically rod-shaped portion 31a of the unit structure 31 in a state of being spaced apart from each other in the longitudinal direction of the third vertically rod-shaped portion 31a, and a rod-shaped portion 221 that is held by the pair of upper and lower clamps 222 so as to be parallel to the third vertically rod-shaped portion 31a. The pair of upper and lower clamps 222 are each a general angle clamp, and are, for example, the same as the above-described first clamp 41 and second clamp 42. The rod-shaped portion 221 is formed, for example, in a substantially rectangular tubular shape. One end portion of the rod-shaped portion 221 in the longitudinal direction is provided with, for example, one of the pair of upper and lower clamps 222, and the other end portion is provided with the other clamp 222. The rod-shaped portion 221 and the pair of upper and lower clamps 222 are fixed to each other, for example, by welding.

[0052] In the case of this embodiment, the unit structures 31 adjacent to each other vertically are reinforced by the reinforcing member 220, for example, as follows. As shown in FIGS. 25(a) and 26(a), the reinforcing member 220 is attached to, for example, the third vertically rod-shaped portion 31a of the unit structure 31. More specifically, one of a pair of clamps 222 is attached to the lower end of the third vertical rod-shaped portion 31a of the upper unit structure 31 among the unit structures 31 adjacent to each other vertically, and the other of the pair of clamps 222 is attached to the upper end of the third vertical rod-shaped portion 31a of the lower unit structure 31 among the adjacent unit structures 31. In this state, the axial directions of the pair of clamps 222 coincide with the longitudinal direction (vertical direction) of the third vertical rod-shaped portion 31a, respectively. Further, the rod-shaped portion 221 is arranged along the lower end of the third vertical rod-shaped portion 31a of the upper unit structure 31 and the upper end of the third vertical rod-shaped portion 31a of the lower unit structure 31. In this way, the reinforcing member 220 reinforces the column member 30 formed by connecting a plurality of unit structures 31 in the longitudinal direction. As shown in FIG. 27(c), one reinforcing member 220 may be attached to the third vertical rod-shaped portion 31a disposed at a position relatively closer to the housing 141 among the pair of third vertical rod-shaped portions 31a, or one reinforcing member 220 may be attached to each of the pair of third vertical rod-shaped portions 31a.

[0053] In the case of this modification example, as an example, the net erection jig 10 includes two reinforcing members 220. Then, as shown in FIG. 25(a), one reinforcing member 220 is attached to each of the lower end of the first-stage unit structure 31 from the top and the upper end of the second-stage unit structure 31 from the top among the plurality of unit structures 31, and one reinforcing member 220 is attached to each of the lower end of the second-stage unit structure 31 from the top and the upper end of the third-stage unit structure 31 from the top.

[0054] Here, an example of a series of flows of the operation of lowering the height position of the anti-scattering net 110 will be described with reference to FIGS. 26(a) to 27(e). First, as shown in FIGS. 26(a) and 26(b), remove the first-stage building frame 130a and the second-stage building frame 130a from the plurality of building frames 130a to which the net erection jig 10 (the first net erection jig 11) is attached, counting from the top. In this state, among the plurality of unit structures 31 that constitute the support member 30, the first-stage unit structure 31 and the second-stage unit structure 31, counting from the top, are each removed from the corresponding building frame 130a. Also, the third-stage unit structure 31, counting from the top, is attached to the first-stage building frame 130a, and the fifth (lowermost) unit structure 31, counting from the top, is attached to the fourth-stage building frame 130a, counting from the top. Next, as shown in FIG. 27(c), remove the support member 30 from the horizontal member 20. More specifically, remove the double clamp 40 from each of the support member 30 and the horizontal members 20, and instead attach the guide mechanism 80 to each horizontal member 20. At this time, one guide mechanism 80 is attached to each of the first-stage horizontal member 20 and the fourth-stage horizontal member 20, counting from the top. Here, the guide mechanism 80 mentioned here is the guide mechanism 80 in the above-described embodiment, and the guide mechanism 80 has a pair of guide members 82a, 82b and rollers 84a, 84b, respectively. Also, one guide mechanism 80 is attached to each of the second-stage horizontal member 20 and the third-stage horizontal member 20, counting from the top. Here, the guide mechanism 80 mentioned here is the guide mechanism 80 in Modification 1, and the guide mechanism 80 includes a clamp 85a and a bifurcated portion 88, respectively. Furthermore, attach one horizontal member 20 and one guide mechanism 80 (the guide mechanism 80 in Modification 1) to the fifth-stage building frame 130a and the sixth-stage building frame 130a, counting from the top, respectively. Also, remove the reinforcing member 220 attached to each of the lower end portion of the second-stage unit structure 31 and the upper end portion of the third-stage unit structure 31 from the unit structure 31. Next, remove the reinforcing members 220 attached to the lower end of the unit structure 31 in the first row from the top and the upper end of the unit structure 31 in the second row from the top, respectively, from the unit structure 31. Then, as shown in FIG. 27(d), guide the column member 30 downward by a plurality of guide mechanisms 80. As shown in FIG. 27(e), when the lower end 30b of the column member 30 is lowered below the height position of the sixth horizontal member 20 from the top, attach the column member 30 to the horizontal member 20 again. More specifically, remove the plurality of guide mechanisms 80 from the corresponding horizontal members 20, and attach the double clamps 40 to each of the horizontal members 20 and the column member 30 again. Also, attach one (or two) reinforcing members 220 to the lower end of the unit structure 31 in the first row from the top and the upper end of the unit structure 31 in the second row from the top, respectively, among the plurality of unit structures 31, and attach one (or two) reinforcing members 220 to the lower end of the unit structure 31 in the second row from the top and the upper end of the unit structure 31 in the third row from the top, respectively. Also, remove the horizontal members 20 in the first row and the second row from the top from the corresponding building frames 130a. Also, for the second net erection jig 12, lower the height position of the upper end 30a of the column member 30 of the second net erection jig 12 in the same procedure so that the height position of the upper end of the second net erection jig 12 is substantially equal to the height position of the upper end of the first net erection jig 11. In this way, the height position of the upper end 30a of the column member 30 can be lowered smoothly and safely. Therefore, the height position of the anti-scattering net 110 can also be lowered smoothly and safely.

[0055] <Modification 4> Next, a fourth modification of the embodiment will be described with reference to FIGS. 28 to 37(b). The net erection device 100 according to this modification is different from the net erection devices 100 according to the above-described embodiment and Modifications 1 to 3 in the points described below, and is configured in the same manner as the net erection devices 100 according to the above-described embodiment and Modifications 1 to 3 in other points.

[0056] In the above-described embodiments and Modifications 1 to 3, an example was described in which the wire 120 from which the splash prevention net 110 is suspended is installed between a plurality of net installation jigs 10. However, in the case of this modification, instead of the wire 120, a rail portion 310 is installed between a plurality of net installation jigs 10, and the splash prevention net 110 is suspended from the rail portion 310. More specifically, in the case of this modification, the net installation device 100 includes a rail portion 310 installed between upper end portions 30a of a pair of support members 30, and a plurality of moving portions 340 provided movably between the upper end portions 30a of the pair of support members 30 along the rail portion 310. The moving portion 340 has a connecting portion 344 from which the splash prevention net 110 is suspended.

[0057] Even with such a configuration, the splash prevention net 110 can be satisfactorily installed at a position above the construction scaffold 130. Therefore, during the dismantling work, a sufficient vertical separation distance between the floor to be dismantled and the splash prevention net 110 can be ensured, so that interference between a heavy machine 150 such as a hydraulic excavator disposed on the floor and the splash prevention net 110 can be suppressed. That is, the splash prevention net 110 can be more easily installed in a preferable arrangement. Furthermore, according to this modification, the net installation device 100 includes a plurality of moving portions 340 provided movably between upper end portions of a pair of support members 30, and the splash prevention net 110 is suspended from the connecting portions 344 of the plurality of moving portions 340. Thereby, the splash prevention net 110 can smoothly move between the upper end portions 30a of the pair of support members 30 as the moving portion 340 moves. Therefore, the opening and closing of the splash prevention net 110 can be easily performed.

[0058] As shown in Fig. 28, also in this modification example, similar to the embodiment and Modification Examples 1 to 3, a plurality of net erection jigs 10 are arranged on one side with the building 140 interposed therebetween in plan view, including a net erection jig 10 (first net erection jig 11) arranged on one side and a net erection jig 10 (second net erection jig 12) arranged on the other side. The first net erection jig 11 and the second net erection jig 12 are arranged to face each other with the building 140 interposed therebetween. Each of the plurality of first net erection jigs 11 is arranged, for example, in a plurality side by side in the direction of facing orthogonally. Similarly, each of the plurality of second net erection jigs 12 is arranged, for example, in a plurality side by side in the direction of facing orthogonally. That is, a plurality of pairs of support members 30 are arranged side by side in the direction of facing orthogonally. Here, the "direction of facing orthogonally" may be any direction that includes at least a component orthogonal to the horizontal direction and the facing direction between the support members 30 on which the rail portions 310 are erected. Then, as shown in Figs. 5 and 6, among the first net erection jigs 11 and the second net erection jigs 12 arranged side by side in the direction of facing orthogonally, a rail portion 310 is erected between the support member 30 of one first net erection jig 11 and the support member 30 of one second net erection jig 12 that face each other with the building 140 interposed therebetween. Also, as shown in Figs. 29(a) to 30, the splash prevention net 110 is suspended, for example, by a pair of rail portions 310, and the splash prevention net 110 is stretched between the pair of rail portions 310. More specifically, one of a pair of rail portions 310 from which a single splash prevention net 110 is suspended (hereinafter, the first rail portion 311) is installed between the support member 30 of one first net installation jig 11 and the support member 30 of one second net installation jig 12, and the other rail portion 310 (hereinafter, the second rail portion 312) is installed between the support member 30 of the first net installation jig 11 disposed adjacent to the first net installation jig 11 and the support member 30 of the second net installation jig 12 disposed adjacent to the second net installation jig 12. That is, the splash prevention net 110 is suspended by a pair of two sets of support members 30. And, by arranging a plurality of such pairs of two sets of support members 30 side by side in the opposing orthogonal directions, a plurality of splash prevention nets 110 are installed side by side in the opposing orthogonal directions.

[0059] Here, in the case of this modification example, as shown in FIGS. 29 and 30, two pairs of support members 30 are arranged so as to be separated from each other by a width interval (hereinafter, simply referred to as the width interval) wider than the width dimension of the splash prevention net 110 in the opposing orthogonal directions to form a set, and the pairs of two sets of support members 30 are arranged adjacent to each other in the opposing orthogonal directions. And, the splash prevention net 110 is suspended on the inner surface sides facing each other of the two pairs of support members 30 separated from each other with the width interval via the moving portions 340, respectively. On the other hand, the moving portions 340 are not provided on the inner surfaces facing each other of the two pairs of support members 30 adjacent to each other in the opposing orthogonal directions, and the splash prevention net 110 is not suspended. As a result, a configuration is adopted in which the scattering prevention net 110 is not suspended between a pair of two strut members 30 and another pair of two strut members 30 (adjacent two pairs of strut members 30) that are different from the pair of two strut members 30. Therefore, for example, when changing the attachment position of the scattering prevention net 110, it is sufficient to change the attachment position of the pair of two strut members 30 from which the scattering prevention net 110 is suspended in the vertical direction or the horizontal direction with respect to the corresponding horizontal member 20. That is, since it is not necessary to change the attachment positions of the two pairs of strut members 30 (strut members 30 of another set) adjacent to the pair of two strut members 30, the attachment position of the scattering prevention net 110 can be changed more smoothly. Here, "adjacent" means, for example, being arranged adjacent to each other at an interval smaller than the dimension in the short side direction of the main part 111 of the scattering prevention net 110. Also, here, the "width dimension of the scattering prevention net 110" means, for example, the width dimension of the scattering prevention net 110 in a state where the scattering prevention net 110 is suspended by a pair of two strut members 30 and is bent by its own weight. Also, here, the "inner surface" means, for example, the opposing surfaces facing each other between two pairs of strut members 30 that are separated from each other with a width interval.

[0060] In the case of this modification, as shown in FIGS. 28, 29(a), and 29(b), the net erection device 100 includes a rod-shaped part 320 to which the rail part 310 is attached, a support structure 360 that supports the rod-shaped part 320, and a plurality of support members 330 that support the rod-shaped part 320 in a state where the support structure 360 and the rod-shaped part 320 are connected to each other.

[0061] As shown in FIG. 28, the rail part 310 is formed, for example, by connecting a plurality of rail part constituent members 315 having the same shape as each other in the longitudinal direction. As shown in FIGS. 31(a) and 31(b), each rail portion component 315 has, for example, a first plate-like portion 316 and a second plate-like portion 317 that intersect each other. Each of the first plate-like portion 316 and the second plate-like portion 317 is formed, for example, in a plate-like shape that is long in the horizontal direction. Each plate surface of the first plate-like portion 316 faces the horizontal direction, and the plate surface of the second plate-like portion 317 faces the vertical direction. One end portion in the width direction of the second plate-like portion 317 is connected to the central portion in the width direction of the first plate-like portion 316. As shown in FIG. 31(b), in a side view, the rail portion component 315 is formed in a shape like a T lying on its side. The length dimension of the first plate-like portion 316 is set, for example, to a dimension equivalent to the length dimension of the second plate-like portion 317. The thickness dimension of the first plate-like portion 316 is set, for example, to a dimension smaller than the thickness dimension of the second plate-like portion 317. Here, in the case of this modification example, on each of the upper surface and the lower surface of the second plate-like portion 317, groove portions 317a extending from one end to the other end in the longitudinal direction of the second plate-like portion 317 are formed. Each groove portion 317a is formed, for example, at the central portion in the width direction of the second plate-like portion 317. The groove portion 317a formed on the upper surface of the second plate-like portion 317 is recessed downward, and the groove portion 317a formed on the lower surface of the second plate-like portion 317 is recessed upward. When a plurality of rail portion components 315 are connected in the longitudinal direction, each groove portion 317a of each rail portion component 315 forms, for example, a series of groove portions 310a that continuously extend in the longitudinal direction. More specifically, a series of groove portions 310a that continuously extend in the longitudinal direction are formed on each of the upper surface and the lower surface of the second plate-like portion 317. And the moving portion 340 is guided by this series of groove portions 310a, and can move between the upper end portions 30a of the support members 30. Note that the length dimension of each rail portion component 315 and the number of rail portion components 315 to be connected are not particularly limited, and can be appropriately set according to the size of the building 140 and the separation distance between a pair of support members 30. Also, the length dimensions of each rail portion component 315 may be set to the same dimension as each other, or may be set to different dimensions from each other.

[0062] As shown in FIG. 28, the rod-shaped portion 320 is formed, for example, by connecting a plurality of rod-shaped component members 321 having the same shape as each other in the longitudinal direction. As shown in FIGS. 32(a), 32(b), and 32(c), the rod-shaped component member 321 is formed, for example, in a substantially rectangular cylindrical shape that is long in one direction and has four surfaces. Each rod-shaped component member 321 is connected to each other, for example, by a connecting member 350. As shown in FIG. 37, the connecting member 350 includes, for example, a pair of insertion portions 351 extending in the horizontal direction, a fixing portion 352 externally inserted into the pair of insertion portions 351, a fastening nut 353 attached to one of the pair of insertion portions 351, and a fastening bolt 354 fixed by the fastening nut 353. The fixing portion 352 is formed, for example, in a substantially rectangular cylindrical shape. The fixing portion 352, the fastening nut 353, and the fastening bolt 354 are arranged, for example, at the central portion in the longitudinal direction of the insertion portion 351. In other words, the pair of insertion portions 351 protrude in both directions in the longitudinal direction from both ends of the fixing portion 352. Further, one end portion of the fastening nut 353 is inserted into the fixing portion 352.

[0063] As shown in FIG. 33(a), one connecting member 350 is attached to one end portion of one of the rod-shaped component members 321 adjacent to each other in the longitudinal direction, and the connecting member 350 is attached to the other end portion of the other rod-shaped component member 321 among the adjacent unit structures 31. In this way, the plurality of rod-shaped component members 321 are connected to each other vertically via the connecting member 350. More specifically, as shown in FIG. 33(a), one end portion of each of the pair of insertion portions 351 is inserted into the inner cavity of the rod-shaped component member 321 on the one side, and the other end portion of each of the pair of insertion portions 351 is inserted into the inner cavity of the rod-shaped component member 321 on the other side. Then, the fixing portion 352 is externally inserted into the joint portion between the rod-shaped component member 321 on the one side and the rod-shaped component member 321 on the other side.

[0064] As shown in FIG. 28, the support structure 360 is formed, for example, in the same manner as the support member 30 by connecting a plurality of second unit structures 361 having the same shape and size as the horizontal member 20 in the longitudinal direction by the connecting member 60. However, each second unit structure 361 is connected to each other in a state of extending in the horizontal direction and is detachably attached to the support member 30. Therefore, the second unit structure 361 has, for example, a pair of fourth horizontal rod-shaped portions 361a each extending horizontally, and a plurality of fourth vertical rod-shaped portions 361b connecting the pair of fourth horizontal rod-shaped portions 361a at each of a plurality of locations in the longitudinal direction of the pair of fourth horizontal rod-shaped portions 361a.

[0065] As shown in FIGS. 35(a), 35(b), and 35(c), the support member 330 has a prism portion 332 extending vertically, a pair of support portions 331 provided at the upper end portion of the prism portion 332, and a clamp 333 provided at the lower end portion of the prism portion 332. The prism portion 332 is formed, for example, in a substantially rectangular tubular shape with a bottom, and has four side surfaces and one bottom surface. Each of the pair of support portions 331 is formed, for example, in a symmetric shape with respect to the prism portion 332. More specifically, one of the pair of support portions 331 is formed on one of the four side surfaces of the prism portion 332, and the other of the pair of support portions 331 is formed on the opposing surface facing the said surface. Each of the pair of support portions 331 has a horizontal portion with each plate surface facing in the vertical direction, and a pair of vertical portions connected to the horizontal portion and with each plate surface facing in the horizontal direction. As shown in FIG. 35(a), the horizontal portion is formed, for example, in a rectangular shape elongated in one direction. A pair of insertion holes 330a penetrating the horizontal portion in the thickness direction are formed in the horizontal portion. As shown in FIG. 35(b), each of the pair of vertical portions is formed, for example, in a substantially right-angled triangular shape in a front view, and one of the two sides excluding the hypotenuse is connected to the prism portion 332. As shown in FIG. 35(c), the clamp 333 is fixed to the bottom of the prismatic portion 332 by, for example, a fixing nut 333a and a fixing bolt 333b. The clamp 333 is a general angle clamp and has, for example, a first clamping portion, a second clamping portion, and a shaft support portion that pivotally supports the first clamping portion and the second clamping portion so as to be mutually openable and closable. Further, it has a fastening bolt that connects the first clamping portion and the second clamping portion to each other, and a fastening nut that is screwed with the fastening bolt.

[0066] As shown in FIG. 28, in the case of this modification, the support structure 360 is detachably attached to the second vertical rod-shaped portion 32b of the corresponding support member 30 via a connecting member (not shown) in a state where the upper end portions 30a of a pair of support members 30 are bridged. The connecting member is not particularly limited, and a double clamp or other members may be used. The length dimension of the support structure 360 is preferably set to be approximately equal to the separation distance between the second vertical rod-shaped portions 32b of the pair of support members 30 in the facing direction, for example. Also, as shown in FIG. 34, in the case of this modification, one rail portion constituting member 315 is attached to one rod-shaped portion constituting member 321. More specifically, the rail portion constituting member 315 is attached to the surface facing the horizontal direction among the four surfaces of the rod-shaped portion constituting member 321. In the example shown in FIG. 29(b), in the rod-shaped portion constituting member 321, a plurality of second insertion holes 320b are formed in the surface to which the rail portion constituting member 315 is attached. Then, by inserting insertion bolts 318 into the second insertion holes 320b and the insertion holes 216a of the rail portion constituting member 315, respectively, the rail portion constituting member 315 and the rod-shaped portion constituting member 321 are fixed to each other. As an example, the length dimension of the rail portion constituting member 315 is set to be slightly larger than the length dimension of the rod-shaped portion constituting member 321. In a state where the rail portion constituting member 315 and the rod-shaped portion constituting member 321 are fixed to each other, both ends in the longitudinal direction of the rail portion constituting member 315 protrude slightly more than both ends in the longitudinal direction of the rod-shaped portion constituting member 321.

[0067] Then, as shown in FIG. 28, a rod-shaped component 321 to which a rail component 315 is fixed is attached to a support structure 360 in a state where a plurality of such rod-shaped components 321 are connected along the longitudinal direction, thereby forming a series of rail parts 310 and a series of rod-shaped parts 320. In this state, the longitudinal direction of the series of rail parts 310 and the longitudinal direction of the rod-shaped parts 320 each coincide with the longitudinal direction of the support structure 360. More specifically, in the case of this modification, a plurality of support members 330 are attached to the rod-shaped component 321, and the rod-shaped component 321 is detachably attached to the support structure 360 via the plurality of support members 330. First insertion holes 320a are respectively formed in the upper and lower pair of surfaces of the rod-shaped component 321. Then, an insertion bolt 334 is inserted into the first insertion hole 320a and the insertion hole 330a of the support portion 331 of the support member 330, whereby the rod-shaped component 321 and the support member 330 are fixed to each other. Also, in this state, the lower surface of the rod-shaped component 321 is supported by the horizontal portion of the support portion 331. Further, the clamps 333 of the respective support members 330 are respectively attached to a plurality of locations in the longitudinal direction of the upper fourth horizontal rod-shaped portion 361a among the pair of fourth horizontal rod-shaped portions 361a of the support structure 360, for example. Note that it is preferable that the number and length dimensions of each of the rail components 315 are set such that the length dimension of the rail part 310 corresponds to the length dimension of the support structure 360. Similarly, it is preferable that the number and length dimensions of each of the rod-shaped components 321 are set such that the length dimension of the rod-shaped part 320 corresponds to the length dimension of the support structure 360.

[0068] As shown in FIGS. 36(a) and 36(b), the moving part 340 has, for example, in addition to the above-described connecting part 344, a pair of upper and lower rotating members 341 that are rotatably attached to the rail part 310, and a bifurcated part 343 that holds the pair of upper and lower rotating members 341 respectively. The upper and lower pair of rotating members 341 are, for example, formed in a vertically symmetric shape with respect to each other. The pair of rotating members 341 includes a wheel 341a formed in a substantially disk shape with the vertical direction as the axial direction, and a flange portion 341b that projects in a circumferential shape radially outward from the outer peripheral surface of the wheel 341a. The flange portion 341b of the upper rotating member 341 is formed at the upper end portion of the wheel 341a, and the flange portion 341b of the lower rotating member 341 is formed at the lower end portion of the wheel 341a. The bifurcated portion 343 includes, for example, a pair of first portions 343a whose plate surfaces are horizontally arranged, and a second portion 343b that connects the pair of first portions 343a to each other. The bifurcated portion 343 is provided with, for example, an upper and lower pair of shaft support portions 342. The upper rotating member 341 arranged on the upper side is rotatably supported by the bifurcated portion 343 by the shaft support portion 342 arranged on the upper side. Similarly, the lower rotating member 341 arranged on the lower side is rotatably supported by the bifurcated portion 343 by the shaft support portion 342 arranged on the lower side. And the upper and lower pair of rotating members 341 are arranged coaxially with each other. The connecting portion 344 has a ring member 344a formed in an annular shape in plan view, and a fixing portion 344b that fixes the ring member 344a to the bifurcated portion 343. The fixing portion 344b is provided, for example, on the surface of the second portion 343b of the bifurcated portion 343 on the side opposite to the side where the rotating member 341 is arranged. Here, also in the case of this modification example, a plurality of small holes 115 are provided at each side end portion in the short hand direction of the main portion 111 of the splash prevention net 110, and an annular member 116 (see FIG. 29(b)) is attached to each small hole 115. In the case of this modification example, the splash prevention net 110 is suspended by the connecting portion 344 by attaching each annular member 116 to each ring member 344a detachably.

[0069] In the case of this modification, as shown in FIGS. 37(a) and 37(b), the outer diameter dimension of the wheel 341a is set to be slightly smaller than the width dimension of the groove portion 310a (groove portion 317a) of the rail portion 310. On the other hand, the outer diameter dimension of the flange portion 341b is set to be slightly larger than the width dimension of the groove portion 310a (groove portion 317a) of the rail portion 310. Also, the separation distance in the vertical direction between the lower surface of the upper wheel 341a and the upper surface of the lower wheel 341a is set to be larger than, for example, the thickness dimension of the formation region of the pair of groove portions 317a in the second plate-like portion 317 and smaller than the vertical dimension of the first plate-like portion 316. And the second plate-like portion 317 is sandwiched by the upper rotating member 341 and the lower rotating member 341. More specifically, the wheel 341a of the upper rotating member 341 is disposed inside the upper groove portion 317a of the rail portion 310, and the flange portion 341b of the upper rotating member 341 abuts against the upper surface of the second plate-like portion 317. Similarly, the wheel 341a of the lower rotating member 341 is disposed inside the lower groove portion 317a of the rail portion 310, and the flange portion 341b of the lower rotating member 341 abuts against the lower surface of the second plate-like portion 317. In this state, the pair of rotating members 341 can rotate and move in the extending direction of the rail portion 310 along the end surface on the side opposite to the first plate-like portion 316 side in the groove portion 317a. According to such a configuration, the moving portion 340 and thus each annular member 116 of the splash prevention net 110 can smoothly move between the pair of support members 30 along the rail portion 310. Furthermore, for example, even if the moving portion 340 is in a state of being inclined downward toward the splash prevention net 110 due to the weight of the splash prevention net 110, the flange portion 341b of the lower rotating member 341 abuts against the lower surface of the second plate-like portion 317, so that the state in which the pair of wheels 341a are disposed inside the corresponding groove portions 317a can be maintained well. Note that retaining fixtures (not shown) for suppressing the detachment of the moving portion 340 from the rail portion 310 may be provided at both ends in the length direction of the rail portion 310. Further, the moving part 340 may be provided so as to be slidable with respect to the rail part 310 without including, for example, a rotating member 341.

[0070] In the case of this modification, as shown in FIG. 30, one of the pair of rail parts 310 (first rail part 311) from which one scattering prevention net 110 is suspended and the other rail part 310 (second rail part 312) of the pair of rail parts 310 are preferably installed in a state of extending parallel to each other in the direction of facing orthogonally. By doing so, the scattering prevention net 110 can be suspended from the rail part 310 (first rail part 311 and second rail part 312) so as to be substantially rectangular in plan view. Also, as shown in FIG. 28, each of the first rail part 311 and the second rail part 312 is preferably installed so as to extend horizontally. By doing so, it is possible to suppress the main part 111 of the scattering prevention net 110 from being bent, and the net installation device 100 can be suspended with the main part 111 being more developed in the horizontal direction. Also, the separation distance between two pairs of support members 30 adjacent to each other in the direction of facing orthogonally is preferably, for example, not more than twice the thickness dimension of the support member 30. By doing so, in plan view, the gap between a plurality of scattering prevention nets 110 adjacent to each other can be made smaller. Therefore, the disassembled material that is about to scatter during the disassembly work can be more reliably captured by the scattering prevention net 110. As an example, two pairs of support members 30 adjacent to each other are attached to a common horizontal member 20. As shown in FIG. 29(b), in the case of this modification, rail parts 310 (first rail part 311 and second rail part 312) are respectively arranged on the inner surface sides of two pairs of support members 30 spaced apart from each other with a width interval therebetween. More specifically, the first rail part 311 is attached to the inner surface of one rod-shaped part 320 of two pairs of support members 30 spaced apart from each other with a width interval therebetween, and the second rail part 312 is attached to the inner surface of the other rod-shaped part 320 of the two pairs of support members 30. On one side, the rail portion 310 is not disposed on the inner surface sides facing each other in two pairs of adjacent support members 30. More specifically, one rail portion 310 is attached to one rod-shaped portion 320.

[0071] More specifically, each annular member 116 attached to one side end portion in the short side direction of the main portion 111 is inserted in order into each moving portion 340 attached to the first rail portion 311, and each annular member 116 attached to the other side end portion in the short side direction of the main portion 111 is inserted in order into each moving portion 340 attached to the second rail portion 312. In this way, in a state where the splash prevention net 110 is suspended from the rail portion 310, one of the pair of first hanging portions 112a, 112b, i.e., the first hanging portion 112a, hangs down along the first rail portion 311, and the other first hanging portion 112b hangs down along the second rail portion 312. Also, between the first rail portion 311 and the second rail portion 312, one of the pair of second hanging portions 113a, 113b, i.e., the second hanging portion 113a, hangs down along one side end portion in the short side direction of the main portion 111, and the other second hanging portion 113a hangs down along the other side end portion in the short side direction of the main portion 111. In the case of this modification, when closing the splash prevention net 110, the splash prevention net 110 can be closed by pulling one end portion of the splash prevention net 110 in the opposite direction toward the other end side. More specifically, the moving portion 340 is guided by the rail portion 310 and moves from one end side to the other end side in the opposite direction, whereby one end portion of the splash prevention net 110 can be pulled toward the other end side. Also, for example, the splash prevention net 110 can be deployed by pulling one end portion of the splash prevention net 110 in the opposite direction toward the one end side from a state where the splash prevention net 110 is closed.

[0072] <Modification 5> Next, a fifth modification of the embodiment will be described with reference to FIGS. 38(a) to 39. In FIG. 38(a), the splash prevention net 110 and the support member 30 are shown by two-dot chain lines. The net erection device 100 according to this modification is different from the net erection devices 100 according to the above-described embodiment and Modifications 1 to 4 in the points described below, and is configured in the same manner as the net erection devices 100 according to the above-described embodiment and Modifications 1 to 4 in other points.

[0073] In the case of this modification, as shown in FIGS. 38(a), 38(b), and 39, two pairs of support members 30 are arranged to be separated from each other at a width interval (hereinafter simply referred to as the width interval) wider than the width dimension of the splash prevention net 110 in the direction of facing and orthogonal to each other, and form a set. The two pairs of support members 30 of one set are also arranged to be separated from each other at a width interval in the direction of facing and orthogonal to each other. Then, the splash prevention net 110 is suspended on the inner surface sides facing each other of the two pairs of support members 30 separated from each other with the width interval via the moving parts 340, respectively. Another splash prevention net 110 different from the splash prevention net 110 is also suspended on the surface side opposite to the inner surface side via the moving parts 340, respectively. As a result, a configuration is formed in which different splash prevention nets 110 are suspended on both side surface sides of the two pairs of support members 30 in the direction of facing and orthogonal to each other. Therefore, in plan view, the gap between a plurality of adjacent splash prevention nets 110 can be made smaller. Therefore, the disassembled materials that tend to scatter during the disassembly work can be more reliably captured by the splash prevention net 110. Here, the "inner surface" means, for example, the opposing surfaces of the two pairs of support members 30 facing each other. The surface opposite to the inner surface of the two pairs of support members 30 means, for example, the surface facing the opposite side of the opposing surface in the direction of facing and orthogonal to each other.

[0074] In the case of this modification, as shown in FIGS. 38(a) and 38(b), a pair of rail portions 310 are attached to one rod-shaped portion 320. The pair of rail portions 310 are symmetrically arranged with respect to each other in the direction of orthogonal opposition with the rod-shaped portion 320 as a reference. More specifically, one of the pair of rail portions 310 is attached to one of the pair of surfaces of the rod-shaped portion 320 in the direction of orthogonal opposition, and the other of the pair of rail portions 310 is attached to the other of the pair of surfaces. Then, different splash prevention nets 110 are suspended from the pair of rail portions 310, respectively. More specifically, as shown in FIG. 39, for each moving portion 340 of one of the pair of rail portions 310, for example, one side end portion in the lateral direction of the main portion 111 of the splash prevention net 110 is suspended. For each moving portion 340 of the other of the pair of rail portions 310, for example, the other side end portion in the lateral direction of the main portion 111 of a splash prevention net 110 different from the splash prevention net 110 suspended from the one rail portion 310 is suspended. According to such a configuration, in the direction of orthogonal opposition, the separation distance between the pair of rail portions 310 arranged adjacent to each other can be made smaller, so that in a plan view, the gap between a plurality of adjacent splash prevention nets 110 can be made even smaller.

[0075] The present invention is not limited to the above-described embodiments, and also includes various modifications, improvements, and the like as long as the object of the present invention is achieved.

[0076] For example, in the above-described Modifications 4 and 5, an example in which the support structure 360 is formed using the second unit structure 361 having the same shape and size as the horizontal member 20 has been described. However, the present invention is not limited to this example, and the shape and size of the second unit structure 361 may be different from the shape and size of the horizontal member 20. In this case, for example, the one shown in FIG. 40 can be used as the second unit structure 361. This second unit structure 361 has, for example, a pair of fourth horizontal rod-shaped portions each extending horizontally, and a reinforcing portion extending in a zigzag manner between the pair of fourth horizontal rod-shaped portions. The reinforcing portion connects the pair of fourth horizontal rod-shaped portions at each of a plurality of locations in the longitudinal direction of the pair of fourth horizontal rod-shaped portions. In the example shown in FIG. 40, the adjacent second unit structures 361 are mutually connected by, for example, a connecting member 370.

[0077] This embodiment encompasses the following technical ideas. (1) It includes a plurality of jig devices for net erection that are attached to a construction scaffold, A splash prevention net can be installed between the plurality of jig devices for net erection, The jig device for net erection is a net erection device including a jig attachment / detachment portion for detachably attaching the jig device for net erection to the construction scaffold in a state where the jig device for net erection protrudes above the construction scaffold. (2) The jig device for net erection includes a horizontal member that is detachably attached to the construction scaffold by the jig attachment / detachment portion in a state of extending in the horizontal direction, and a support member that is detachably attached to the horizontal member in a state of being erected vertically, and the splash prevention net is suspended at the upper end portion of the support member, and the net erection device according to (1), wherein the attachment position of the support member with respect to the horizontal member is variable in the horizontal direction. (3) The horizontal member has a pair of upper and lower horizontally extending horizontal rod-shaped portions, and a plurality of vertical rod-shaped portions connecting the pair of horizontal rod-shaped portions at each of a plurality of locations in the longitudinal direction of the pair of horizontal rod-shaped portions. The net erection device according to (2), wherein the pair of horizontal rod-shaped portions are attached to the construction scaffold in a state along the outer surface of the structure's framework. (4) The support member has a pair of second vertically extending vertical rod-shaped portions, and a plurality of second horizontally extending rod-shaped portions connecting the pair of second vertically extending rod-shaped portions at each of a plurality of locations in the longitudinal direction of the pair of second vertically extending rod-shaped portions. The pair of second vertically extending rod-shaped portions are along the outer surface of the framework, and one of the pair of second vertically extending rod-shaped portions is disposed at a position relatively close to the framework, and the other of the pair of second vertically extending rod-shaped portions is disposed at a position relatively far from the framework. The net erection device according to (3), wherein the support member is attached to the horizontal member. (5) The support member is attached to the horizontal member by connecting the other second vertically extending rod-shaped portion and the horizontal rod-shaped portion with a double clamp. The net erection device according to (4). (6) A rail portion installed between the upper end portions of the pair of support members, A plurality of moving portions provided movably along the rail portion between the upper end portions of the pair of support members, and The moving portion has a connecting portion to which the splash prevention net is suspended. The net erection device according to any one of (2) to (5). (7) A plurality of pairs of the pair of support members are arranged side by side in the opposing orthogonal directions, Two pairs of support members are spaced apart from each other in the opposing orthogonal directions by a width interval wider than the width dimension of the splash prevention net to form a set, The two pairs of support members in the set are arranged adjacent to each other in the opposing orthogonal directions, The splash prevention net is suspended on the inner surfaces facing each other of the two pairs of support members spaced apart from each other by the width interval, respectively, via the moving portions. The moving part is not provided on the inner surfaces facing each other of the two pairs of support members adjacent to each other in the opposite orthogonal direction, and the anti-scattering net is not suspended, which is characterized in that it is the net erection device according to (6). (8) A plurality of pairs of the pair of support members are arranged side by side in the opposite orthogonal direction, Two pairs of support members are arranged separately from each other at the width interval wider than the width dimension of the anti-scattering net in the opposite orthogonal direction to form a set, The two pairs of support members of the set are arranged separately from each other at the width interval in the opposite orthogonal direction, On the inner surfaces facing each other of the two pairs of support members separated from each other with the width interval therebetween, the anti-scattering net is suspended via the moving part respectively, and on the surface side opposite to the inner surface side, another anti-scattering net different from the anti-scattering net is also suspended via the moving part respectively, which is characterized in that it is the net erection device according to (6). (9) The wire on which the anti-scattering net is suspended can be erected between a plurality of the net erection jigs, which is the net erection device according to any one of (1) to (5). (10) The net erection jig, is configured to hold the wire at the upper end of the support member, includes a wire hanger attached to the upper end of the support member, the wire hanger has a pulley with which the wire engages, The wire can be erected between the pulleys of the wire hangers of the plurality of net erection jigs, which is the net erection device according to (9). (11) It includes an assembling member for assembling the pair of support members to each other, the pair of support members assembled to each other via the assembling member are attached to a common horizontal member, the wire hanger is erected between the upper ends of the pair of support members, which is the net erection device according to (10). (12) A cable body feeding mechanism capable of feeding out a cable body that supports the column member in a state of being removed from the horizontal member, A guide mechanism that guides the column member in the state of being removed from the horizontal member up and down, and includes The guide mechanism is detachably attached to the horizontal member, The cable body feeding mechanism is detachably attached to the construction scaffold. The net erection device according to any one of (3) to (11) cited in (2). (13) The guide mechanism includes a pair of guide members that are detachably attached to the horizontal member in a state of being spaced apart from each other in the longitudinal direction of the horizontal bar-shaped portion, and a roller that is spanned between the pair of guide members so as to be parallel to the horizontal bar-shaped portion. With the pair of guide members, the roller, and the column member passed through the space surrounded by the horizontal bar-shaped portion, the guide mechanism guides the column member up and down. The net erection device according to (12). (14) The column member is formed by connecting a plurality of unit structures having the same shape and size as the horizontal member in the longitudinal direction. The net erection device according to any one of (3) to (13) cited in (2). [Explanation of Signs]

[0078] 10 Fixture for net erection 11 First fixture for net erection 12 Second fixture for net erection 15 Fixture attachment / detachment part 20 Horizontal member 22 Horizontal bar-shaped portion 24 Vertical bar-shaped portion 30 Column member 30a Upper end portion 30b Lower end portion 31 Unit structure 31a Third vertical bar-shaped portion 31b Third horizontal bar-shaped portion 32 Second vertical bar-shaped portion 32a One of the second vertical bar-shaped portions 32b Second vertical rod-shaped part of the other party 34 Second horizontal rod-shaped part 35a, 35b First insertion hole 36a Second insertion hole 40 Double clamp 41 First clamp 42 Second clamp 50 Wire hanger 51 Connecting part 52a, 52b Pulley 53a, 53b Insertion part 54 Annular part 55a, 55b Bracket 57a, 57b Shaft support part 60 Connecting member 61 First cylindrical part 62 Second cylindrical part 64 Connecting part 65a, 65b Plate-shaped part 66a Insertion hole 66b, 66c Fitting hole 67a Horizontal part 67b Vertical part 68 Locking nut 69 Insertion bolt 70 Cable payout mechanism 71 Cable 72 Hook part 73 Mounting member 75 Second locking member 76 Mounting fitting 76a Insertion hole 76b Locking hole 77 Fork part 78 Plate-shaped part 80 Guide mechanism 80a Space 82a, 82b Guide member 84a, 84b Roller 85a, 85b Clamp 87a First plate-shaped part 87b Second plate-shaped part 88 Fork part 88a Opposing part 89a, 89b Notch-shaped part 90 Holding mechanism 91 Chain 92 First Hook Part 93 Second Hook Part 94 Operation Part 95 First Locking Member 96 Clip Member 100 Net Erection Device 110 Anti-Scattering Net 111 Main Part 112a, 112b First Hanging Part 113a, 113b Second Hanging Part 115 Dovetail Hole 116 Annular Member 120 Wire 121 First Wire 122 Second Wire 126a, 126b Rope 130 Construction Scaffold 130a Building Frame 131 Frame Body 132 Leg Part 133 Platform Holding Beam Part 134 Platform Member 135 Brace 140 Building (Structure) 141 Body 142 Outer Surface 150 Heavy Machine 210 Assembly Member 211a, 211b Support Part 212a, 212b Connection Part 213a, 213a Locking Nut 214a, 214b Insertion Bolt 220 Reinforcement Member 221 Rod-Shaped Part 222 Clamp 310 Rail Part 310a Groove Part 311 First Rail Part 312 Second Rail Part 315 Rail Part Constituent Member 316 First Plate-Like Part 316a Insertion Hole 317 Second Plate-Like Part 317a Groove Part 318 Insertion bolt 320 Rod-shaped part 320a First insertion hole 320b Second insertion hole 321 Rod-shaped member 330 Support member 330a Insertion hole 331 Support part 332 Prismatic part 333 Clamp 333a Fixing nut 333b Fixing bolt 334 Insertion bolt 340 Moving part 341 Rotating member 241a Wheel 341b Flange part 342 Shaft support part 343 Fork part 343a First part 343b Second part 344 Connecting part 344a Ring member 344b Fixing part 345 Mounting member 350 Connecting member 351 Insertion part 352 Fixing part 353 Fastening nut 354 Fastening bolt 360 Support structure 361 Second unit structure 370 Connecting member

Claims

1. Comprising a plurality of jig fixtures for net installation, which are attached to a construction scaffold, A splash prevention net can be installed between the plurality of jig fixtures for net installation, The jig fixture for net installation includes a jig attachment / detachment part for detachably attaching the jig fixture for net installation to the construction scaffold in a state where the jig fixture for net installation protrudes above the construction scaffold, The jig fixture for net installation A horizontal member that is detachably attached to the construction scaffold by the jig attachment / detachment part in a horizontally extending state, A support member that is detachably attached to the horizontal member in a vertically standing state, Comprises, The splash prevention net is suspended at the upper end of the support member, A net installation device in which the attachment position of the support member with respect to the horizontal member is variable in the horizontal direction.

2. The horizontal member has a pair of horizontally extending upper and lower horizontal rod-shaped parts and a plurality of vertical rod-shaped parts that connect the pair of horizontal rod-shaped parts at each of a plurality of locations in the longitudinal direction of the pair of horizontal rod-shaped parts. The net installation device according to claim 1, wherein the pair of horizontal rod-shaped parts are attached to the construction scaffold in a state along the outer surface of the structure's framework.

3. Each of the support members has a pair of second vertical rod-shaped parts extending in the vertical direction and a plurality of second horizontal rod-shaped parts that connect the pair of second vertical rod-shaped parts at each of a plurality of locations in the longitudinal direction of the pair of second vertical rod-shaped parts. The pair of second vertical rod-shaped parts are along the outer surface of the framework, and one of the pair of second vertical rod-shaped parts is arranged at a position relatively close to the framework and the other of the pair of second vertical rod-shaped parts is arranged at a position relatively far from the framework. The net installation device according to claim 2, wherein the support member is attached to the horizontal member.

4. The net installation device according to claim 3, wherein the support member is attached to the horizontal member by connecting the other second vertical rod-shaped part and the horizontal rod-shaped part with a double clamp.

5. A rail part installed between the upper ends of the pair of support members, A plurality of moving parts provided movably between the upper ends of the pair of support members along the rail part. The net erection device according to any one of claims 1 to 4, wherein the moving part has a connecting part from which the splash prevention net is suspended.

6. A plurality of pairs of the pair of support members are arranged side by side in the opposing orthogonal direction, Two pairs of support members are arranged to be separated from each other at a width interval wider than the width dimension of the splash prevention net in the opposing orthogonal direction to form a set, The two pairs of support members are arranged adjacent to each other in the opposing orthogonal direction, The two pairs of support members separated from each other with the width interval therebetween have the splash prevention net suspended on their inner surfaces facing each other via the moving part, The net erection device according to claim 5, wherein the moving part is not provided on the inner surfaces facing each other of the two pairs of support members adjacent to each other in the opposing orthogonal direction, and the splash prevention net is not suspended.

7. A plurality of pairs of the pair of support members are arranged side by side in the opposing orthogonal direction, Two pairs of support members are arranged to be separated from each other at a width interval wider than the width dimension of the splash prevention net in the opposing orthogonal direction to form a set, The two pairs of support members are also arranged to be separated from each other at the width interval in the opposing orthogonal direction, The two pairs of support members separated from each other with the width interval therebetween have the splash prevention net suspended on their inner surfaces facing each other via the moving part, and another splash prevention net different from the said splash prevention net is suspended on the surface side opposite to the inner surface side via the moving part respectively. The net erection device according to claim 5 is characterized by this.

8. The net erection device according to any one of claims 1 to 4, wherein a wire from which the splash prevention net is suspended can be erected between a plurality of the net erection jigs.

9. The net erection jig is configured to hold the wire at the upper end of the support member, includes a wire hanger attached to the upper end of the support member, the wire hanger has a pulley with which the wire engages, The net erection device according to claim 8, wherein the wire can be erected between the pulleys of the wire hangers of the plurality of net erection jigs.

10. It includes an assembling member for assembling a pair of the support members to each other, The pair of support members assembled to each other via the assembling member are attached to a common horizontal member. The wire hanger is the net erection device according to claim 9, which is installed between the upper ends of the pair of support members.

11. A cable feeding mechanism capable of feeding out a cable body that supports the support member in a state of being removed from the horizontal member, A guide mechanism that guides the support member in a state of being removed from the horizontal member up and down, Comprising, The guide mechanism is detachably attached to the horizontal member, The cable feeding mechanism is the net erection device according to any one of claims 1 to 10, which is detachably attached to the construction scaffold.

12. The guide mechanism has a pair of guide members that are detachably attached to the horizontal member in a state of being spaced apart from each other in the longitudinal direction of the horizontal bar-shaped portion, and a roller spanned between the pair of guide members so as to be parallel to the horizontal bar-shaped portion. The net erection device according to claim 11, which cites claim 2, wherein the guide mechanism guides the support member up and down with the support member passed through the space surrounded by the pair of guide members, the roller, and the horizontal bar-shaped portion.

13. The support member is formed by connecting a plurality of unit structures having the same shape and size as the horizontal member in the longitudinal direction. The net erection device according to any one of claims 1 to 12.

Images