JP6621361B2 - Protective net unit, plant equipment, and installation method of protective net unit - Google Patents

Description

  The present invention relates to a protective net unit, plant equipment, and a method for installing a protective net unit.

  Conventionally, various techniques for installing a protection net covering a protection object around the protection object are known. For example, in Patent Document 1, a linear member (rope) attached to a peripheral portion of a film-like member (protective net) is attached to a plurality of support portions provided on a frame body installed around a protection target. A support structure is disclosed in which a film-like member is supported by a frame through a plurality of support portions by winding. Further, Patent Document 2 is configured as a unit having a panel surface whose main component is a wire mesh, and a detachable connecting portion provided on at least one side edge of the panel surface. A wire mesh panel unit that constitutes a wire mesh structure by combining with the unit is disclosed.

Japanese Patent Laying-Open No. 2015-163761 Japanese Utility Model Publication No. 64-57366

  However, in the protection net support structure disclosed in Patent Document 1, a plurality of support portions are provided on a frame body that is installed around an object to be protected, and then the protection net is provided with respect to the plurality of support portions. The work of winding the attached rope is required, and the work load at the site is large. Further, when the protective net is installed, it is necessary to provide work scaffolds on both the outer side and the inner side of the frame body and to cure the protection target, which increases the work period. In addition, the wire mesh panel unit described in Patent Document 2 can be easily assembled, disassembled, transferred, reassembled, and repaired by a general consumer according to the purpose of use and preference for a small wire mesh structure such as a pet cage. The purpose is to make it possible. For this reason, it is difficult to apply the technique of Patent Document 2 to a large-sized wire mesh structure for protecting a relatively large object to be protected as included in the plant equipment.

  The present invention has been made in view of the above, and it is an object of the present invention to simplify the installation work of a protection net for protecting a relatively large protection object and reduce the work period.

  In order to solve the above-described problems and achieve the object, the protective net unit of the present invention includes a protective net, a rope attached to a peripheral portion of the protective net, and the rope being wound to support the protective net. A plurality of support members, and a frame member attached to the plurality of support members and capable of positioning the plurality of support members at a support position when supporting the protective net, the plurality of support members, The surface opposite to the attachment position of the frame member is fixed to a frame body installed around the protection target.

  In the protection net unit of the present invention, a frame member that positions a plurality of support members at a support position when supporting the protection net is attached to the plurality of support members, and is opposite to the attachment position of the frame member of the plurality of support members. The side surface is fixed to a frame installed around the object to be protected. As a result, before fixing a plurality of support members to the frame installed around the object to be protected, that is, in a work separate from the work of installing the protective net on the frame, it is attached to the periphery of the protective net. The protective rope, the rope, the plurality of support members, and the frame member can be assembled as a protective net unit by winding the rope around the plurality of support members. As a result, the field work for attaching the protective net unit to the frame body is only the work for fixing the plurality of support members to the frame body, so the work burden on the field can be reduced. In addition, by fixing a plurality of support members to the frame on the surface opposite to the attachment position of the frame member, it is possible to work only on the outside of the frame at the site, so work on the inside of the frame It is possible to omit the work of installing and dismantling the scaffolding and the work of curing the protection object. Therefore, according to the protection net unit of the present invention, it is possible to simplify the installation work of the protection net for protecting relatively large protection objects and reduce the work period.

  The frame member is preferably removable from the plurality of support members after the plurality of support members are fixed to the frame. Thereby, the weight of the protection net unit installed in the frame can be reduced.

  Moreover, it is preferable that a plurality of the protective nets are arranged in a stacked manner. As described above, even when a plurality of protective nets are used, the protective net unit according to the present invention can reduce the work load at the site, thereby simplifying the installation work of the protective net and reducing the work period. be able to.

  Moreover, it is preferable that a plurality of the ropes are attached to each of the plurality of protective nets. In this way, even when a plurality of ropes are attached to each of a plurality of protective nets, the protective net unit of the present invention can reduce the work load at the site, so the installation of the protective nets The work can be simplified and the work period can be reduced.

  The rope has one end connected to a turnbuckle, and the turnbuckle is connected to the rope adjacent to the rope in the stacking direction when viewed from the stacking direction of the plurality of protective nets. It is preferable that the turnbuckle is disposed at a position that does not overlap with the other turnbuckle. Thereby, since the turnbuckle overlaps when viewed from the stacking direction of the protective net, it is possible to suppress the thickness of the portion from increasing and interfering with the frame member. Therefore, the protective net, the rope, and the plurality of support members Also, the assembly work of the frame member can be easily performed.

  Moreover, it is preferable that the turnbuckles are arranged at positions different from each other in the stacking direction, depending on whether the turnbuckles are arranged odd-numbered or even-numbered in the stacking order. Thereby, each turnbuckle connected to each rope can be easily arranged at a position where they do not overlap when viewed from the stacking direction of the plurality of protective nets.

  Further, the other end of the rope is fastened to the rope itself by a fastener, and the fastener is adjacent to the fastened rope in the stacking direction when viewed from the stacking direction of the plurality of protective nets. It is preferable that the other fasteners fastened to the matching ropes are arranged at positions where at least a part does not overlap. Thereby, it can suppress that the thickness of the part increases and it interferes with a frame member because a fastener overlaps seeing from the lamination direction of a protection net.

  A plurality of the protection net units are fixed to the frame body side by side, a reinforcing member is attached to a part of the plurality of supporting members, and the reinforcing member is located between the adjacent protection net units. It is preferable to be fixed to the frame located at the position. Thereby, the frame body which is located between adjacent protection net units and which receives a comparatively large load can be favorably reinforced by the reinforcing member.

  In order to solve the above-described problems and achieve the object, a plant facility of the present invention includes a protection net unit of the present invention, a protection object at least partially covered by the protection net, and a surrounding area of the protection object. And a frame to which the plurality of support members are fixed.

  In order to solve the above-described problems and achieve the object, the present invention provides a protection net unit installation method in which the protection net unit of the present invention is installed on a frame body that is installed around a protection target, The frame member is attached to a plurality of support members, the plurality of support members are positioned at the support position, the rope is wound around the plurality of support members, and the protective net, the rope, the plurality of support members, and the frame An assembly step of assembling a member as the protective net unit; and a fixing step of fixing the plurality of support members to the frame body from the side opposite to the attachment position of the frame member after the assembly step. And

  The protection net unit, the plant equipment, and the installation method of the protection net unit according to the present invention can simplify the installation work of the protection net for protecting relatively large protection objects and reduce the work period. There is an effect.

Drawing 1 is an explanatory view showing the important section of the plant equipment concerning an embodiment. FIG. 2 is an explanatory diagram illustrating a protection net unit according to the embodiment. FIG. 3 is an explanatory view showing an assembling process of the protective net unit. FIG. 4 is an explanatory view showing an assembling process of the protective net unit. FIG. 5 is an explanatory view showing an assembling process of the protective net unit. FIG. 6 is an explanatory view showing an assembling process of the protective net unit. FIG. 7 is an explanatory view showing a state in which the assembled protective net unit is fixed to the frame. FIG. 8 is an explanatory diagram showing a structure for attaching a plurality of wire ropes to a protective net and a support member. FIG. 9 is an explanatory view showing a structure for attaching a plurality of wire ropes to a protective net and a support member. FIG. 10 is an explanatory view showing a structure for attaching a plurality of wire ropes to a protective net and a support member. FIG. 11 is an explanatory view showing a structure for attaching a plurality of wire ropes to a protective net and a support member. FIG. 12 is an explanatory diagram showing a protective net positioned on the odd-numbered sheets in the stacking order. FIG. 13 is an explanatory diagram showing a protection net positioned at the even number in the stacking order. FIG. 14 is a perspective view showing a protective net as a comparative example. FIG. 15 is an explanatory diagram illustrating an example of a work process and a work period from assembly to installation of the protection net unit. FIG. 16 is an explanatory diagram illustrating an example of a work process and a work period until a protective net is installed as a comparative example.

  Hereinafter, embodiments of a protection net unit, plant equipment, and a method of installing a protection net unit according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

  Drawing 1 is an explanatory view showing the important section of plant equipment 1 concerning the embodiment of the present invention. The plant facility 1 is a facility such as a nuclear power plant or a reprocessing plant, for example. As shown in FIG. 1, the protection object 2, a frame 3 surrounding the protection object 2, and one of the protection objects 2. And a plurality of protection net units 10 including a plurality of protection nets 20 covering the part.

  The protection object 2 is a relatively large facility such as a pump, and is disposed outside the building. The frame 3 is formed by assembling a plurality of steel frames such as H-shaped steel, I-shaped steel, angle steel, and channel steel around the object 2 to be protected. A plurality of protection net units 10 are fixed to the frame 3 in a plurality. In the present embodiment, the plurality of protection net units 10 are fixed to the frame body 3 located on the side of the protection object 2. The protection net unit 10 may be fixed to the frame body 3 positioned above the protection target object 2. The plurality of protection net units 10 protects the protection target object 2 from flying objects such as steel frames that fly due to, for example, a tornado by the respective protection nets 20.

  FIG. 2 is an explanatory diagram illustrating the protection net unit 10 according to the embodiment. The figure on the left side in the figure is a front view showing the protection net unit 10, and the figure on the right side in the figure is a side view showing the protection net unit 10. The protection net unit 10 includes a plurality of the protection nets 20, a plurality of wire ropes 30 attached to each of the plurality of protection nets 20, and a plurality of wire ropes 30 wound around the plurality of wire ropes 30. A plurality of (four in this embodiment) support members 40 that support the protective net 20 via the support member 50 and a reinforcing member 50 are provided.

  The protection net 20 is a wire net made of a metal material such as stainless steel or iron, for example, and is stretched around the side of the protection object 2 to protect the protection object 2 from flying objects. The protective net 20 may be a fiber network such as synthetic resin fiber or natural fiber. As shown in FIG. 2, the protection net 20 is formed in a rectangular shape, and square cutouts 20 a are formed at the corners of the four corners. Each support member 40 is arrange | positioned in the position in which the notch 20a was formed. In the present embodiment, five protection nets 20 are stacked for each protection net unit 10. Note that the number of the protective nets 20 stacked is not limited to five, and at least one protective net unit 10 may be provided. Further, the protective net 20 may be formed in a square shape and may be formed with square notches 20a at the corners of the four corners. The notch 20a may be formed in an arc shape.

  The plurality of wire ropes 30 are made of, for example, a hard steel wire, a stainless steel wire, a piano wire, or the like. Each wire rope 30 is sewn to a part of the peripheral edge of the protection net 20, and is wound around a part of each support member 40 arranged at the corners of the four corners of the protection net 20. Four wire ropes 30 are attached to each protection net 20. Note that at least one wire rope 30 may be attached to each protection net 20.

  The support member 40 includes a substrate section 41 having a square cross section, a columnar columnar section 42 provided on the substrate section 41 and around which the wire rope 30 is wound, and a side of the columnar section 42 opposite to the substrate section 41. And a holding plate 43 having a circular cross section fixed to the end face. The substrate portion 41 of the support member 40 may have a rectangular cross section, a polygonal cross section, or a circular cross section. The columnar part 42 may have a prismatic shape. The holding plate portion 43 may have a polygonal cross section.

  The substrate portion 41 of the support member 40 is fixed to the frame 3 by welding. Thus, by fixing the board | substrate part 41 to the frame 3 by welding, the protection net unit 10 can be firmly fixed to the frame 3 via the some support member 40. FIG. Moreover, compared with the case where the supporting member 40 is fixed to the frame 3 using a plurality of fasteners, it is possible to suppress an increase in the work process and the number of parts. Details of the installation work of the protective net unit 10 to the frame 3 will be described later.

  The columnar portion 42 of the support member 40 includes a plurality of separators 44 that are formed at intervals along the axial direction of the columnar portion 42 and project from the outer peripheral surface. Each separator 44 is formed in a plate shape. Each separator 44 divides the outer peripheral surface of the columnar portion 42 into six ranges in the axial direction. The plurality of wire ropes 30 are individually wound around each range of the outer peripheral surface of the columnar section 42 divided into a plurality in the axial direction by a plurality of separators 44 for each of the plurality of protection nets 20. Thereby, it is possible to prevent the wire ropes 30 from interfering with each other between the plurality of protection nets 20 and to apply appropriate tension to the wire ropes 30 and thus the protection nets 20.

  Next, a method for installing the protective net unit 10 on the frame 3 will be described in accordance with a series of steps from the assembling process of the protective net unit 10 to the fixing process to the frame 3. FIGS. 3 to 6 are explanatory views showing the assembly process of the protective net unit 10, and FIG. 7 is an explanatory view showing a state in which the assembled protective net unit 10 is fixed to the frame 3. 3 to 6, the upper diagram shows a plan view, and the lower diagram shows a side view. In FIG. 7, the upper diagram shows a side view, and the lower diagram shows a plan view.

  The assembling process of the protection net unit 10 is performed in a facility different from the arrangement position of the protection target object 2 in the plant equipment 1. In the assembling process of the protective net unit 10, first, as shown in FIG. 3, four support members 40 are placed on the support base 100, and the substrate portion 41 of the support member 40 and the support base 100 are clamped 70. Use to fix. The support base 100 is formed by, for example, stacking H-shaped steel in two stages.

  Next, as shown in FIG. 4, the frame member 60 is attached to the holding plate portions 43 of the plurality of support members 40. The frame member 60 is formed as a rectangular frame, and is detachably fastened to the holding plate portion 43 of the support member 40 by a plurality of bolts and nuts (not shown). As a result, the plurality of support members 40 are positioned at the support positions when the protection net 20 is supported by the frame member 60.

  After the plurality of support members 40 are positioned at the support positions by the frame member 60, as shown in FIG. 5, each protection net 20 is arranged inside the four support members 40, and each of the protection nets 20 attached to each protection net 20. The wire rope 30 is wound around the plurality of support members 40. Here, FIG. 8 to FIG. 11 are explanatory diagrams showing the attachment structure of each wire rope 30 to the protection net 20 and the support member 40. 8 to 11 are the same in all directions. 8 to 11, only the columnar portion 42 around which the plurality of wire ropes 30 are wound is described among the constituent elements of the support member 40. 8 to 11, the wire rope 30 shown in FIG. 8 is the first wire rope 31, the wire rope 30 shown in FIG. 9 is the second wire rope 32, and the wire rope 30 shown in FIG. The wire rope 33 and the wire rope 30 shown in FIG.

  The first wire rope 31 is sewn to the lower short side 21 in FIG. 8 of the protective net 20, the right long side 22 in FIG. 8, and the lower side 20b in the upper left notch 20a in FIG. The first wire rope 31 is wound around the columnar portions 42 of all the support members 40 arranged at the four corners of the protective net 20. One end 31 a of the first wire rope 31 is attached to the turnbuckle 71. The turnbuckle 71 is disposed at a position offset by a predetermined distance from the upper left support member 40 in FIG. The other end 31 b of the first wire rope 31 is fastened to the first wire rope 31 itself by a plurality of fasteners (wire grips) 81. The plurality of fasteners 81 are arranged at positions offset by a predetermined distance from the upper right support member 40 in FIG.

  The second wire rope 32 is sewn to the lower side 20b of the upper right notch 20a in FIG. The 2nd wire rope 32 is wound around the columnar part 42 of the supporting member 40 arrange | positioned at the upper right and upper left in FIG. One end 32 a of the second wire rope 32 is attached to the turnbuckle 71. The other end 32 b of the second wire rope 32 is fastened to the second wire rope 32 itself by a plurality of fasteners 82. Thereby, the first wire rope 31 and the second wire rope 32 are connected to each other via the turnbuckle 71 and are fixed to the protective net 20 and the support member 40. The plurality of fasteners 82 are arranged at positions offset by a predetermined distance from the upper left support member 40 in FIG. 9. Further, the plurality of fasteners 82 are arranged at positions offset to the upper side in FIGS. 8 and 9 with respect to the plurality of fasteners 81.

  The third wire rope 33 is sewn to the upper short side 23 in FIG. 10 of the protective net 20, the left long side 24 in FIG. 10, and the upper side 20b of the lower right notch 20a in FIG. The third wire rope 33 is wound around the columnar portions 42 of all the support members 40 arranged at the four corners of the protective net 20. One end 33 a of the third wire rope 33 is attached to the turnbuckle 72. The turnbuckle 72 is disposed at a position offset by a predetermined distance from the lower right support member 40 in FIG. The other end 33 b of the third wire rope 33 is fastened to the third wire rope 33 itself by a plurality of fasteners 83. The plurality of fasteners 83 are arranged at positions offset by a predetermined distance from the lower left support member 40 in FIG.

  The fourth wire rope 34 is sewn to the upper side 20b of the lower left notch 20a in FIG. The 4th wire rope 34 is wound around the columnar part 42 of the support member 40 arrange | positioned in the lower right and lower left in FIG. One end 34 a of the fourth wire rope 34 is attached to the turnbuckle 72. The other end 34 b of the fourth wire rope 34 is fastened to the fourth wire rope 34 itself by a plurality of fasteners 84. As a result, the third wire rope 33 and the fourth wire rope 34 are coupled via the turnbuckle 72 and are fixed to the protective net 20. The plurality of fasteners 84 are disposed at positions offset by a predetermined distance from the lower right support member 40 in FIG. Further, the plurality of fasteners 84 are disposed at positions offset downward in FIGS. 10 and 11 with respect to the plurality of fasteners 83.

  Thus, in the protection net unit 10 of the present embodiment, the mounting positions of the turnbuckle 71 and the turnbuckle 72 and the plurality of fasteners 81, 82, 83 and 84 are determined by the distance from the support member 40. Thereby, even if the size of the protective net 20 is changed for each protective net unit 10, it is possible to prevent the installation positions of the turn buckle 71 and the turn buckle 72 and the plurality of fasteners 81, 82, 83 and 84 from being mistaken. can do.

  Here, FIG. 12 is an explanatory diagram showing the odd-numbered protective nets 20 in the stacking order, and FIG. 13 is an explanatory diagram showing the even-numbered protective nets 20 in the stacking order. As shown in the figure, each protection net 20 is stacked with the odd-numbered protection net 20 and the even-numbered protection net 20 in the stacking order so that the left-right relationship in FIGS. 12 and 13 is reversed. . As a result, the turnbuckle 71 and the turnbuckle 72 are arranged at different positions when viewed from the stacking direction of the protective net 20. That is, when viewed from the stacking direction of the plurality of protective nets 20, the turnbuckle 71 and the turnbuckle 72 are connected to the wire rope 30 connected to the wire rope 30 adjacent in the stacking direction and the other turnbuckle 71 connected thereto. And it arrange | positions in the position which does not overlap with the turnbuckle 72. FIG.

  In addition, in the protective net 20 arranged in the odd numbered order in the stacking order, the plurality of fasteners 82 are arranged offset to the upper side in the drawing with respect to the plurality of fasteners 81, and the plurality of fasteners 84 are plural. The fastener 83 is offset from the lower side in the figure. On the other hand, in the protective net 20 arranged in the even number in the stacking order, a plurality of fasteners 81 are arranged offset to the upper side in the drawing with respect to the plurality of fasteners 82 and a plurality of fasteners 83 are provided. The fastener 84 is offset from the lower side in the figure. Thereby, the plurality of fasteners 81, 82, 83, and 84 are fastened to the wire ropes 30 adjacent to each other in the stacking direction when viewed from the stacking direction of the plurality of protective nets 20. The plurality of fasteners 81, 82, 83, and 84 are arranged so as not to partially overlap.

  FIG. 14 is an explanatory diagram showing a protective net unit 10B as a comparative example. In the protective net unit 10B, a turnbuckle 71 (or a turnbuckle 72) connected to one end of the wire rope 30 is disposed so as to overlap when viewed from the stacking direction of the protective net 20. As a result, the thickness H2 of the portion where the turnbuckle 71 (or turnbuckle 72) overlaps is greater than the thickness H1 of the plurality of protective nets 20, and the frame member 60 may not be attached to the plurality of support members 40. is there.

  In the protection net unit 10 of the present embodiment, the turnbuckles 71 and the turnbuckles 72 connected to the wire ropes 30 are connected to the plurality of protection nets 20 in two of the plurality of protection nets 20 that are successively stacked. It can arrange | position in the position which does not overlap seeing from the lamination direction. Accordingly, the frame member 60 can be easily attached to the plurality of support members 40 without forming a portion having a thickness larger than the thickness H1 of the protection net unit 10.

  In the protection net unit 10 of the present embodiment, a plurality of fasteners 81, 82, 83, and 84 that fasten the wire ropes 30 are connected to the plurality of the protection nets 20 continuously stacked. The protective net 20 can be disposed at a position where the portions do not overlap when viewed from the stacking direction. This also makes it possible to easily attach the frame member 60 to the plurality of support members 40 without forming a portion having a thickness larger than the thickness H1 of the protective net unit 10.

  Next, as shown in FIG. 6, the reinforcing member 50 is fixed to a part of the four support members 40. In this embodiment, the reinforcing member 50 is formed in a plate shape by, for example, a steel frame, and on the end surfaces of the two substrate portions 41 arranged along the short side 21 of the protective net 20 among the four support members 40. Fixed by welding. The reinforcing member 50 may be formed in a T-shaped cross section. Further, the reinforcing member 50 may be fastened and fixed to the substrate portion 41 of the support member 40 using a plurality of bolts and a plurality of nuts.

  After assembling the protection net unit 10 in this way, a fixing process is performed in which the protection net unit 10 is transported to the vicinity of the protection object 2 and fixed to the frame 3 installed around the protection object 2. As shown in FIG. 7, in the protective net unit 10, the surface of the plurality of support members 40 opposite to the attachment position of the frame member 60 is fixed to the frame body 3 by welding. Moreover, as shown in FIG. 1, the reinforcement member 50 is welded to the frame 3 located between adjacent ones in the vertical direction (vertical direction in FIG. 1) among the plurality of protective net units 10. Fixed. Thereby, the intermediate member of the frame 3 to which a relatively large load is applied can be favorably reinforced by the reinforcing member 50.

  After the protection net unit 10 is fixed to the frame 3, the frame member 60 is removed from the plurality of support members 40 as shown in FIGS. 1 and 2. Thereby, the weight of the protection net unit 10 can be reduced and the load concerning the frame 3 can be reduced. Note that the frame member 60 may be left attached to the plurality of support members 40 when it is not necessary to reduce the load applied to the frame body 3. Further, after the frame member 60 is removed, another reinforcing member that is lighter in weight than the frame member 60 may be attached to the plurality of support members 40.

  As described above, in the protection net unit 10 of the present embodiment, the frame member 60 positions the plurality of support members 40 at the support position, so that the plurality of support members 40 are installed around the protection object 2. Before fixing to 3, each wire rope 30 attached to the protective net 20 can be wound around a plurality of support members 40. That is, the protective net 20, the wire rope 30, the plurality of support members 40, and the frame member 60 can be assembled as the protective net unit 10 in a work separate from the work of installing the protective net 20 on the frame 3 (panelization). can do).

  As a result, the field work for attaching the protective net unit 20 to the frame body 3 is only the work for fixing the plurality of support members 40 to the frame body 3, so that the work burden on the field can be reduced. In addition, since the work space at the site can be reduced, it is possible to arrange a plurality of protection net units 10 around the protection object 2 arranged in a narrow area in the plant facility 1. Furthermore, it is possible to improve the assembly quality of the protective net unit 10 and the inspection accuracy of the assembly quality.

  Further, as a field work for attaching the protective net unit 20 to the frame body 3 by fixing the surface of the plurality of support members 40 opposite to the attachment position of the frame member 60 to the frame body 3, You can only work with it. As a result, it is not necessary to assemble an internal scaffold for attaching the protection net unit 10 inside the frame 3 or to cure the protection object 2 when attaching the protection net unit 10.

  Here, FIG. 15 is an explanatory view showing an example of the work process and work period from assembly to installation of the protection net unit 10, and FIG. 16 shows the work process and work until installation of the protection net 20 as a comparative example. It is explanatory drawing which shows an example of a period. FIG. 16 shows that a plurality of support members 40 are fixed to the frame 3 at the site, and a plurality of protection nets 20 are stacked on each of the plurality of support members 40 while being attached to each of the plurality of protection nets 20. The work process in the case of winding each wire rope 30 around each support member 40 is shown.

  As shown in FIG. 15, the work steps from assembly to installation of the protective net unit 10 include (1) an assembly process of an external scaffold for attaching the protective net unit 10 to the frame 3, and (2) the protective net unit 10. (3) A step of attaching the protective net unit 10 to the frame 3, that is, a step of fixing the plurality of support members 40 to the frame 3, and (4) a step of disassembling the external scaffold are required. On the other hand, the work steps up to the installation of the protective net 20 as a comparative example in FIG. 16 include (1) an assembly process of an external scaffold for attaching the protective net 20 to the frame 3, and (2) a protective net on the frame 3. Assembly of internal scaffold for attaching 20 and curing process of protection object 2, (3) Installation process of protection net 20 to frame 3, (4) Dismantling of internal scaffold, and removal of protection object 2 Step, (5) The step of dismantling the external scaffold is required.

  As shown in the work period of the (3) net attachment step in FIGS. 15 and 16, in the protection net unit 10 of the present embodiment, a plurality of support members 40 are fixed to the frame 3 at the site, and then the plurality of the plurality of support members 40 are fixed. Compared to the case where each wire rope 30 attached to each piece is wound around each support member 40 while laminating a plurality of protective nets 20 on the support member 40, the work burden of field work can be reduced. The work period can be reduced.

  Further, in the protection net unit 10 of the present embodiment, as described above, as shown in FIG. 16, (2) internal scaffold assembly and curing work of the protection target object 2, (4) internal scaffold dismantling and curing removal of the protection target object 2 are performed. This step can be omitted. Further, during the formation of the outer scaffold of the frame 3 at the site (the work period of (1) shown in FIG. 15), the assembling process of the protective net unit 10 (shown in FIG. 15) at a facility different from the site ( The work period 2) can be performed. On the other hand, in the work process up to the installation of the protection net 20 of the comparative example shown in FIG. 16, at least (1) the assembly process of the external scaffold, (2) the assembly of the internal scaffold, and a part of the curing process of the protection object 2 It is necessary to wait for the start of the attaching process of the protective net 20 until the process is finished.

  Thus, according to the protection net unit 10 of the present embodiment, the work period until the installation of the protection net unit 10 can be reduced as compared with the comparative example shown in FIG. In addition, by reducing the work period until the installation of the protection net unit 10, work at high places can be reduced, so that work safety can also be improved.

  As described above, according to the plant equipment 1, the protection net unit 10, and the installation method of the protection net unit 10 according to the embodiment, the installation work of the protection net for protecting the relatively large protection object 2 is simplified. And reduction in work period.

  Further, the frame member 60 can be detached from the plurality of support members 40 after the plurality of support members 40 are fixed to the frame 3. Thereby, the weight of the protection net unit 10 installed in the frame 3 can be reduced.

  A plurality of protective nets 20 are arranged in a stacked manner. As described above, even when a plurality of protection nets 20 are used, the protection net unit 10 according to the embodiment can reduce the work load at the site, so that the installation work of the protection net 20 can be simplified and the work period can be reduced. Can be reduced.

  A plurality of wire ropes 30 are attached to each of the plurality of protective nets 20. As described above, even when a plurality of wire ropes 30 are attached to each of the plurality of protection nets 20, the protection net unit 10 according to the embodiment can reduce the work burden on site. Thus, the installation work of the protective net 20 can be simplified and the work period can be reduced.

  Further, one end of the wire rope 30 is connected to the turnbuckle 71 or the turnbuckle 72, and the turnbuckle 71 and the turnbuckle 72 are connected to each other when viewed from the stacking direction of the plurality of protective nets 20. And other turnbuckles 71 and turnbuckles 72 connected to adjacent wire ropes 30 in the stacking direction. Accordingly, since the turnbuckle 71 and the turnbuckle 72 overlap each other when viewed from the stacking direction of the protection net 20, it is possible to prevent the thickness of the portion from increasing and interfere with the frame member 60. 20, the assembly work of the wire rope 30, the plurality of support members 40, and the frame member 60 can be easily performed. Each turnbuckle 71 and each turnbuckle 72 connected to each wire rope 30 has a plurality of protective nets as long as there is no possibility of interfering with the frame member 60 when the frame member 60 is attached to the plurality of support members 40. They may be arranged so as to overlap each other when viewed from the stacking direction.

  Further, the turnbuckle 71 and the turnbuckle 72 are arranged at different positions in the stacking direction depending on the odd-numbered and even-numbered protective nets 20 in the stacking order. Thereby, the turnbuckle 71 and the turnbuckle 72 can be easily disposed at a position where they do not overlap when viewed from the stacking direction of the plurality of protective nets 20. Note that the turnbuckle 71 and the turnbuckle 72 need not be arranged at the same position among the plurality of protective nets 20 that are arranged in an odd number in the stacking order and those that are arranged in an even number. All of the nets 20 may be arranged at different positions.

  The other end of the wire rope 30 is fastened to the wire rope 30 itself by a plurality of fasteners 81, 82, 83, or 84, and the plurality of fasteners 81, 82, 83, and 84 are connected to the plurality of protective nets 20. When viewed from the laminating direction, the plurality of fasteners 81, 82, 83, and 84 that are fastened to the wire rope 30 that is fastened and the wire rope 30 that is adjacent in the laminating direction are arranged at positions that do not overlap. The Thereby, when each fastener 81, 82, 83, and 84 overlaps seeing from the lamination direction of the protective net 20, it can suppress that the thickness of the part increases and interferes with the frame member 60. Note that each of the fasteners 81, 82, 83, and 84 may be arranged at a position where not all but a part of the protective net 20 overlap when viewed from the stacking direction of the protection net 20. The fasteners 81, 82, 83, and 84 overlap with each other when viewed from the stacking direction of the protective net 20 unless there is a possibility of interference with the frame member 60 when the frame member 60 is attached to the plurality of support members 40. It may be arranged.

  The attachment structure of the wire rope 30 to the protective net 20 and the plurality of support members 40 is not limited to that shown in FIGS. For example, one wire rope 30 may be sewn to the peripheral edge of the protective net 20 and both ends of the wire rope 30 may be connected by turnbuckles. Also in this case, if the turnbuckles connected to the wire ropes 30 are arranged at positions where they do not overlap when viewed from the stacking direction of the plurality of protective nets 20, the turnbuckles and the frame member 60 are prevented from interfering with each other. can do.

  In addition, a plurality of protection net units 10 are fixed to the frame 3 side by side, and a reinforcement member 50 is attached to a part of the plurality of support members 40, and the reinforcement members 50 are arranged between adjacent protection net units 10. It is fixed to the frame 3 located between them. Thereby, the part which is located between the adjacent protection net units 10 among the frames 3 and which receives a comparatively big load can be favorably reinforced by the reinforcing member 50. The reinforcing member 50 may be omitted from the protective net unit 10.

DESCRIPTION OF SYMBOLS 1 Plant equipment 2 Protective object 3 Frame 10, 10B Protective net unit 20 Protective net 20a Notch 20b Side 21, 23 Short side 22, 24 Long side 30 Wire rope 31 First wire rope 31a, 32a, 33a, 34a One end 31b, 32b, 33b, 34b Other end 32 Second wire rope 33 Third wire rope 34 Fourth wire rope 40 Support member 41 Substrate portion 42 Column portion 43 Holding plate portion 44 Separator 50 Reinforcement member 60 Frame member 71, 72 Turnbuckle 81, 82, 83, 84 Fastener 100 Support base

Claims (10)

A protective net,
A rope attached to the periphery of the protective net;
A plurality of support members around which the rope is wound to support the protective net;
A frame member attached to the plurality of support members and capable of positioning the plurality of support members at a support position when supporting the protective net;
With
The protection net unit, wherein the plurality of support members are fixed to a frame body having a surface opposite to an attachment position of the frame member around the object to be protected.   2. The protective net unit according to claim 1, wherein the frame member is removable from the plurality of support members after the plurality of support members are fixed to the frame body.   The protection net unit according to claim 1, wherein a plurality of the protection nets are stacked.   The protection net unit according to claim 3, wherein a plurality of the ropes are attached to each of the plurality of protection nets. The rope has one end connected to a turnbuckle,
When viewed from the stacking direction of the plurality of protective nets, the turnbuckle is disposed at a position that does not overlap the connected rope and the other turnbuckle connected to the adjacent rope in the stacking direction. The protective net unit according to claim 3 or 4, wherein the protective net unit is provided.   The turnbuckle is disposed at odd positions in the stacking order among the plurality of protective nets and at even positions in the stacking order, and is disposed at different positions as viewed from the stacking direction. Item 6. The protective net unit according to item 5. The other end of the rope is fastened to the rope itself by a fastener,
The fastener, when viewed from the stacking direction of the plurality of protective nets, is a position where at least a part of the fastened rope and the other fastener fastened to the adjacent rope in the stacking direction do not overlap. The protective net unit according to claim 5 or 6, wherein the protective net unit is arranged in a vertical direction. A plurality of the protective net units are arranged along the frame body,
A reinforcing member is attached to a part of the plurality of support members,
The protection net unit according to any one of claims 1 to 7, wherein the reinforcing member is fixed to the frame body positioned between the adjacent protection net units.   The protection net unit according to any one of claims 1 to 8, a protection object that is at least partially covered by the protection net, and a plurality of support members that are installed around the protection object. A plant facility comprising: a fixed frame. A method for installing a protective net unit, wherein the protective net unit according to any one of claims 1 to 8 is installed on a frame body that is installed around an object to be protected.
The frame member is attached to the plurality of support members, the plurality of support members are positioned at the support positions, the rope is wound around the plurality of support members, the protection net, the rope, the plurality of support members, and the An assembly process for assembling the frame member as a protective net unit;
After the assembly step, a fixing step of fixing the plurality of support members to the frame body from the side opposite to the mounting position of the frame member;
The installation method of the protection net unit characterized by comprising.

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