Fall prevention structure

Abstract

To provide a fall prevention structure for preventing a suspended ceiling from falling without deteriorating the appearance of the ceiling surface. [Solution] A fall prevention structure for a suspended ceiling that suspends and supports a ceiling material 11 by a suspension bolt fixed to the suspension point, characterized in that it comprises a rope support member 210 having a base portion 211 fixed to a first soffit 21A and a ring portion 215 supported by the base portion, an auxiliary rope having one longitudinal end connected to the ring portion and the other longitudinal end connected to an appropriate position located above the rope support member, and a reinforcing joining layer 260 formed continuously on the side surface 24 of the first soffit and the upper surface of the ceiling material.

Description

[Technical field]

[0001] This invention relates to a structure for preventing a suspended ceiling from falling. [Background technology]

[0002] A suspended ceiling is constructed by suspending and supporting the ceiling surface material with hanging bolts fixed to the suspension points of the building's framework or beams. In the event of a major earthquake, the hanging bolts may break or fall, causing damage to suspended ceilings in various places. In order to prevent suspended ceilings from falling, various technologies have been developed and are being used.

[0003] Patent Document 1 describes a ceiling fall prevention structure that includes a damage prevention sheet that is evenly attached to the entire underside of a ceiling material, a separate hanging material that suspends the ceiling material from the suspension point and is provided separately from the hanging bolts, and a support material that is fastened to the separate hanging material below the damage prevention sheet. The support material is composed of a plate-like object or the like that has a support surface that supports the underside of the damage prevention sheet. The support material is composed of a metal, synthetic resin, or the like that has sufficient strength to support the weight of the ceiling material. The shape of the support surface of the support material is, for example, a circle, an ellipse, a rectangle, or a polygon. The ceiling fall prevention structure of Patent Document 1 prevents the ceiling material from falling by using the separate hanging material and the receiving material even if the hanging bolt falls off. The damage prevention sheet prevents the ceiling material from being crushed and supports the ceiling material together with the separate hanging material and the receiving material so that it does not fall. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP2015-183457A Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, a damage prevention sheet and a receiving material are placed on the underside of the ceiling material, which causes a problem in that the appearance of the ceiling is deteriorated. The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide a fall prevention structure that prevents a suspended ceiling from falling without compromising the appearance of the ceiling. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention is a fall prevention structure for a suspended ceiling that suspends and supports a ceiling material by a hanging bolt fixed to the hanging point, and is characterized in that it comprises a rope support member having a base portion fixed to a first soffit and a ring portion supported by the base portion, an auxiliary rope having one longitudinal end connected to the ring portion and the other longitudinal end connected to an appropriate position located above the rope support member, and a reinforcing joining layer formed continuously on the side of the first soffit and the upper surface of the ceiling material. Effect of the Invention

[0007] According to this invention, it is possible to prevent the collapse of a suspended ceiling without compromising the appearance of the ceiling. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a schematic configuration of a fall prevention structure according to an embodiment of the present invention; [Diagram 2] 1 is a front view showing the schematic configuration of a ceiling vibration control system that constitutes the fall prevention structure of the present invention. [Diagram 3] 13 is an oblique view illustrating a clip that connects a furring strip support and a furring strip. FIG. [Figure 4] 11(a) to 11(e) are perspective views showing examples of connecting auxiliary ropes. [Diagram 5] 1A and 1B are diagrams illustrating a rope support member, in which (a) is a perspective view showing the state in which it is fastened to a rafter, and (b) is a view seen from the arrow E in (a). [Figure 6]1A to 1C are diagrams illustrating the reinforcing means in the ceiling fall prevention system, where (a) is a plan view, (b) is an oblique view, and (c) is an enlarged oblique view of a portion around the rope support member. [Figure 7] 6(a) to 6(d) are cross-sectional views taken along lines AA, BB, CC and DD in FIG. 6(a), respectively. [Figure 8] FIG. 2 is a perspective view illustrating an example of a form for producing a reinforcing bonding layer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present invention will be described in detail below with reference to the embodiment shown in the drawings. However, unless otherwise specified, the components, types, combinations, shapes, relative positions, etc. described in the embodiment are merely illustrative examples and do not limit the scope of the invention.

[0010] [First embodiment] Fig. 1 is a perspective view showing the schematic configuration of a fall prevention structure according to an embodiment of the present invention. Fig. 2 is a front view showing the schematic configuration of a ceiling vibration control system constituting the fall prevention structure according to the present invention. Fig. 3 is a perspective view explaining a clip that connects a siding support to a siding. Note that Fig. 1 omits illustrations of the clip, reinforcing joint layer, connecting material, and some auxiliary ropes. Fig. 2 also shows a cross section of the building frame and ceiling material that are the hanging point.

[0011] The fall prevention structure 1 according to this embodiment is a structure for preventing the fall of a suspended ceiling 10, and includes a ceiling vibration control system 100 and a ceiling fall prevention system 200. The ceiling vibration control system 100 and the ceiling fall prevention system 200 are disposed between a hanging point S and the ceiling 10 suspended from the hanging point S.

[0012] <Basic structure of suspended ceiling> The ceiling 10, which is a suspended ceiling, is configured to include a ceiling material 11, which is a ceiling surface material, and a ceiling base material 12. The ceiling base material 12 includes a joist 21 and a joist support 31. The ceiling 10 is suspended from a suspension point S by a suspension bolt 40 and a hanger 50, which are ceiling suspension materials. The hanging point S is composed of the building frame, beams, etc. When the frame is made of reinforced concrete, a ceiling insert to which the upper end of the hanging bolt 40 is screwed (fixed) is embedded in the hanging point S during construction of the building.

[0013] The ceiling suspension material that suspends and supports the ceiling 10 includes a suspension bolt 40 and a hanger 50. The suspension bolt 40 has an upper end portion screwed (fixed) to a ceiling insert embedded in the suspension point S and hangs down from the suspension point S. The suspension bolt 40 is made of galvanized steel, stainless steel, or the like. The hanger 50 is made by bending a strip-shaped metal plate, and is roughly J-shaped when viewed from the side. The hanger 50 is fixed to the lower end of the hanging bolt 40 using a nut. The hanger 50 receives and holds the siding support 31 in a holding space provided at its lower end. The hanger 50 is made of galvanized steel, stainless steel, or the like. The hanging bolt 40 and the hanger 50 are accessory hardware for the ceiling 10 .

[0014] As shown in Fig. 3, the siding support 31 has a generally square U-shaped cross section, which is a so-called C-channel. The siding support 31 is made of galvanized steel, stainless steel, or the like. The siding support 31 is arranged so that it extends horizontally with its open portion facing to the side. The open portion side of the siding support 31 is the ventral side, and the side opposite the ventral side on which the web 32 is formed is the dorsal side.

[0015] As shown in Fig. 3, the siding 21 has a generally C-shaped cross section and is provided with lips 22, 22 on the open side. The siding 21 is made of galvanized steel, stainless steel, or the like. The siding 21 is disposed perpendicular to the siding support 31 so as to extend horizontally with the open side facing upward. The siding 21 is disposed below the siding support 31. The ceiling material 11 is fixed to the siding 21 from below with screws or the like.

[0016] 1, the siding members 21 and the siding support members 31 are combined in a lattice pattern in a plan view. In general, the siding members 21 are arranged at intervals of about 300 to 450 mm, and the siding support members 31 are arranged at intervals of about 900 mm.

[0017] The clip for connecting the furring strip support and the furring strip will be described with reference to Fig. 3. Fig. 3 shows the state before and after the clip is attached. The clip 60 connects the soffit support 31 and the soffit 21 at the intersection where the soffit support 31 and the soffit 21 intersect. The clip 60 is made of galvanized steel, stainless steel, etc. The clip 60 is an accessory metal fitting for the ceiling 10.

[0018] The clip 60 comprises a side panel portion 61 which is positioned to the side of the sill support 31 in an upright state, lower engagement portions 62, 62 which are positioned at the bottom of the side panel portion 61 and engage with the sill 21, and an upper engagement portion 63 which extends from the upper edge of the side panel portion 61 in a direction intersecting (perpendicular) to the side panel portion 61 and is engaged with the upper portion of the sill support 31.

[0019] The side plate portion 61 is attached to the back or ventral side of the furring strip support 31. The lower locking portions 62, 62 are hook-shaped with their tips curved upward. The lower locking portions 62, 62 are inserted into the void 23 extending along the longitudinal direction of the furring strip 21 and locked to the lip portions 22, 22. The upper locking portion 63 includes an attachment portion 64 located near the side plate portion 61 and attached to the outer surface of the upper flange portion 33 of the furring strip support 31, and locking pieces 65, 65 extending beyond the attachment portion 64 in the opposite direction to the side plate portion 61. The upper locking portion 63 is locked to the upper flange portion 33 of the furring strip support 31 by bending the locking pieces 65, 65.

[0020] <Ceiling vibration control system> As a ceiling vibration control system, the system described in Patent No. 7203368 can be applied. That is, as shown in FIG. 2, the ceiling vibration control system 100 includes a first damper 106, a second damper 107, and beams 108 (108a, 108b).

[0021] The first damper 106 and the second damper 107 are members that damp vibrations occurring in the ceiling 10. The first damper 106 and the second damper 107 are arranged at an incline toward each other so as to form a V-shape that widens upward. As the dampers that constitute the first damper 106 and the second damper 107, various dampers such as an oil damper, a viscoelastic damper, a gas damper, a hysteresis damper, and a friction damper can be used, but it is preferable to use a free piston type gas spring damper from the viewpoint of reducing costs and weight.

[0022] The bundling material 108 is a member extending in the vertical direction. The bundling material 108 suppresses out-of-plane deformation of the ceiling 10 caused by expansion and contraction (expansion and contraction) of the first damper 106 and the second damper 107. The bundling material 108 preferably has a buckling load larger than that of the hanging bolt 40. The bundling material 108 is formed into a rod shape from a metal material such as stainless steel or galvanized steel sheet.

[0023] The first bundle 108a and the second bundle 108b are disposed adjacent to the third suspension bolt 40c, and are disposed parallel to the third suspension bolt 40c with the third suspension bolt 40c sandwiched therebetween. The first bundle 108a and the second bundle 108b are disposed at a position different from the third suspension bolt 40c. The lower end of the first strut 108a is fixed to the sill support 31 of the ceiling 10 via a first auxiliary bracket 109a and a lower fixing bracket 113, and the upper end of the first strut 108a is fixed to the hanging point S via a third upper fixing bracket 114c and a third hanging bolt 40c. The lower end of the second strut 108b is fixed to the sill support 31 of the ceiling 10 via a second auxiliary bracket 109b and a lower fixing bracket 113, and the upper end of the second strut 108b is fixed to the hanging point S via a third upper fixing bracket 114c and a third hanging bolt 40c.

[0024] The lower end of the first damper 106 is fixed to the sill support 31 of the ceiling 10 via the first auxiliary bracket 109a and the lower fixing bracket 113, and the upper end of the first damper 106 is fixed to the hanging point S via the first upper fixing bracket 114a and the first hanging bolt 40a. The lower end of the second damper 107 is fixed to the sill support 31 of the ceiling 10 via the second auxiliary bracket 109b and the lower fixing bracket 113, and the upper end of the second damper 107 is fixed to the hanging point S via the second upper fixing bracket 114b and the second hanging bolt 40b.

[0025] The first damper 106 is fixed to the first auxiliary metal fitting 109a so as not to be able to swing, and the first bundle 108a is fixed to the first auxiliary metal fitting 109a so as to be able to swing. The second damper 107 is fixed to the second auxiliary metal fitting 109b so as not to be able to swing, and the second bundle 108b is fixed to the second auxiliary metal fitting 109b so as to be able to swing. The first damper 106 has a first joint 106a that allows the axial length of the first damper 106 to be adjusted, and the second damper 107 has a second joint 107a that allows the axial length of the second damper 107 to be adjusted.

[0026] <<How to install a ceiling vibration control system>> An example of a method for installing the ceiling vibration control system 100 will be described with reference to FIG. The ceiling vibration control system 100 can be installed in a similar manner on both an existing ceiling 10 and a newly constructed ceiling 10, as long as the ceiling base material 12 is suspended from the suspension point S by the suspension bolts 40.

[0027] The following describes a method of constructing the ceiling vibration control system 100 by assembling the damper and beam to form a V-shaped assembly when viewed from the front, and then inserting the assembly between the hanging point S and the ceiling 10. When constructing the ceiling vibration control system 100, the lower fixing bracket 113 is fixed in advance to a portion of the sill support 31 in the vicinity of the third suspension bolt 40c. In addition, the first to third upper fixing brackets 114a to 114c are fixed to the upper ends of the first to third suspension bolts 40a to 40c, respectively.

[0028] In this construction method, first, the lower end of the first damper 106 and the lower end of the first bundle 108a are fixed to a first auxiliary metal fitting 109a, and the first damper 106 and the first bundle 108a are assembled into a V-shaped first assembly 110a. Also, the lower end of the second damper 107 and the lower end of the second bundle 108b are fixed to a second auxiliary metal fitting 109b, and the second damper 107 and the second bundle 108b are assembled into a V-shaped second assembly 110b.

[0029] Next, the first auxiliary metal fitting 109a is fixed to the lower fixing metal fitting 113, the upper end of the first bundle 108a is fixed to the third upper fixing metal fitting 114c, and the upper end of the first damper 106 is fixed to the first upper fixing metal fitting 114a. At this time, the inclination angle of the first damper 106 relative to the first bundle 108a is adjusted, and the length of the first damper 106 is adjusted by the first joint 106a, thereby aligning the position of the first upper fixing metal fitting 114a with the position of the upper end of the first damper 106.

[0030] In addition, the second auxiliary metal fitting 109b is fixed to the lower fixing metal fitting 113, the upper end portion of the second bundle 108b is fixed to the third upper fixing metal fitting 114c, and the upper end portion of the second damper 107 is fixed to the second upper fixing metal fitting 114b. At this time, the inclination angle of the second damper 107 relative to the second bundle 108b is adjusted, and the length of the second damper 107 is adjusted by the second joint 107a, thereby aligning the position of the second upper fixing metal fitting 114b with the position of the upper end portion of the second damper 107.

[0031] This completes the installation of the ceiling vibration control system 100. The above installation order can be changed as appropriate.

[0032] <Ceiling fall prevention system> 1 is a means for preventing the ceiling 10 from falling in the event that the hanging bolts 40 are broken or fractured, and functions as a fail-safe unit. The ceiling fall prevention system 200 is configured to include an auxiliary suspension means in place of the hanging bolts 40, and a reinforcing means for allowing the ceiling fall prevention system 200 to function safely.

[0033] 4(a) to (e) are perspective views showing examples of connections of auxiliary ropes. The ceiling fall prevention system 200 is equipped with, as an auxiliary hanging means, a rope support member 210 fixed to the joist 21, and an auxiliary rope 220 having one end 220a (lower end) connected to the rope support member 210 and the other end 220b (upper end) connected to a suitable position located above the rope support member 210.

[0034] <<Rope support member>> FIG. 5 is a diagram illustrating a rope support member, in which (a) is a perspective view showing a state in which it is fastened to a rafter, and (b) is a view seen from an arrow E in (a). The rope support member 210 includes a base portion 211 fixed to the joist 21, and a ring portion 215 supported by the base portion 211 and through which the auxiliary rope 220 is inserted. The rope support member 210 is made of galvanized steel, stainless steel, or the like.

[0035] The base portion 211 has a cross-sectional shape (cross-sectional shape in a direction perpendicular to the longitudinal direction of the joist 21) that is roughly U-shaped (or C-shaped) and is open on the bottom. The base portion 211 includes a roughly rectangular upper plate portion 212 that extends horizontally, and side plate portions 213, 213 that extend downward from two opposing sides of the upper plate portion 212. The base portion 211 can be made of a channel steel. The base portion 211 has a recess 214 surrounded by an upper plate portion 212 and side plate portions 213, 213. The recess 214 receives the joist 21 from the open portion side. The upper plate portion 212 is attached to the upper surface (upper portion) of the joist 21, and the side plate portions 213, 213 are attached to the side surface 24 of the joist 21. The side plate portions 213, 213 have insertion holes (not shown) formed therethrough to insert the shanks of bolts.

[0036] The ring portion 215 stands upright from the upper plate portion 212 of the base portion 211. The ring portion 215 is fixed to the upper plate portion 212 of the base portion 211 by welding. The ring portion 215 can be formed from, for example, the eye portion of an eyebolt.

[0037] A communication hole (not shown) communicating with the insertion hole of the rope support member 210 is formed through the side surface 24 of the siding 21. The insertion hole of the rope support member 210 and the communication hole of the siding 21 are communicated with each other, and the shaft portion of a bolt B (fastening member) is inserted into both holes from one side plate portion 61 side, and a nut N (fastening member) is screwed onto the shaft portion of the bolt protruding from the other side plate portion 61, thereby fixing the rope support member 210 to the siding 21.

[0038] <<Auxiliary rope>> 4, the auxiliary rope 220 is a flexible wire that can form loops 221 (221a, 221b) at each of its longitudinal ends (one end 220a, the other end 220b). The auxiliary rope 220 has enough strength to support a suspended ceiling in place of the suspension bolt 40. The auxiliary rope 220 can be a wire rope, but is preferably a synthetic fiber rope. High-strength fibers such as aramid fibers and carbon fibers are particularly preferable as the synthetic fibers constituting the auxiliary rope 220. The auxiliary rope 220 is preferably made of a braided rope in which the synthetic fibers constituting the rope are woven together so as not to twist. Synthetic fiber ropes are very lightweight and can be folded and bundled, making them easy to transport.

[0039] The auxiliary rope 220 is connected to other components by forming the loop portion 221 so that it cannot fall off. If the auxiliary rope 220 is a synthetic fiber rope, the loop portion 221 can be made from a knot. If the loop portion 221 is made from a knot, no special tools are required to form the loop portion 221. In addition, since the auxiliary rope 220 can be connected to other components simply by tying, the construction time of the ceiling fall prevention system 200 can be shortened. The knot to be used is one that does not change the size of the looped portion 221 substantially when the auxiliary rope 220 is subjected to a pulling force and is difficult to untie. For example, a bowline knot, a reinforced bowline knot (modified bowline knot), or the like is used as the knot. The loop portion 221 can also be made using a fastener instead of using a knot.

[0040] 4(a) to 4(e) show a state in which one end 220a of the auxiliary rope 220 is connected to the ring portion 215 of the rope support member 210 by a loop portion 221a made by a bowline knot. The ring portion 215 of the rope support member 210 has a size that allows the auxiliary rope 220 to be inserted therethrough.

[0041] 4(a) to (e) show a state in which the other end 220b of the auxiliary rope 220 is connected to a suitable position located above the rope support member 210 by a loop portion 221b made by a bowline knot. FIG. 4(a) shows a state in which the other end 220b of the auxiliary rope 220 is directly tied to the hanging bolt 40. A locking fitting 230 that prohibits the passage of the looped portion 221b of the auxiliary rope 220 is fixed to the middle portion of the hanging bolt 40 in the longitudinal direction. The auxiliary rope 220 is tied to the hanging bolt 40 above the locking fitting 230, and the looped portion 221b is disposed above the locking fitting 230. The locking fitting 230 prevents the looped portion 221b from moving downward beyond the locking fitting 230. The looped portion 221b of the auxiliary rope 220 is made to a size that does not allow the locking fitting 230 to pass through. The locking fitting 230 may be any fitting that can prevent the looped portion 221b from passing through. For example, the locking fitting 230 may be a fitting similar to the locking fitting 230 shown in FIG. 4(b).

[0042] Figures 4(b) to (d) show the other end 220b of the auxiliary rope 220 tied to a locking fitting (locking fitting 230, eye bolt 240) having a hole (hole portion 233, eye portion 241) through which the auxiliary rope 220 can be inserted. A locking fitting 230 (third connecting fitting) shown in FIG. 4(b) includes an attachment portion 231 detachably fixed to the hanging bolt 40, and a rope support portion 232 having a hole portion 233 through which the auxiliary rope 220 can be inserted, and is fixed to an appropriate position in the middle portion of the hanging bolt 40 in the longitudinal direction. The auxiliary rope 220 is connected to the locking fitting 230 by inserting it through the hole portion 233 and forming a loop portion 221b by tying it with a bowline knot. The locking fitting 230 is fixed to an appropriate position in the longitudinal direction of the hanging bolt 40 using a bolt and a nut. As the locking fitting 230, a swing prevention fitting (such as a hanging bolt swing prevention fitting, DYR1S-W, manufactured by Negros Electric Co., Ltd.) for attaching a brace for preventing swinging of the hanging bolt 40 can be used.

[0043] 4(c) shows an eyebolt 240 (first connecting fitting) fixed to the hanging point S at a position different from the hanging bolt 40 as a locking fitting to which the auxiliary rope 220 is connected. The eyebolt 240 may be one that is screwed into a front-installed ceiling insert or one that is screwed into a post-installed female thread anchor. 4(d) shows an eyebolt 240 (second connecting fitting) fixed to the structural wall SW as a locking fitting to which the auxiliary rope 220 is connected. The eyebolt 240 may be threaded into a pre-installed insert embedded in the structural wall SW, or may be threaded into a post-installed female thread anchor embedded in the structural wall SW. In Figures 4(c) and (d), the auxiliary rope 220 is connected to the eye bolt 240 by being inserted through the eye portion 241 and then tying it into a bowline knot to form a loop portion 221b.

[0044] FIG. 4(e) shows a state in which the other end 220b of the auxiliary rope 220 is tied to an existing steel frame member 250 other than the ceiling base material 12. An example of a steel frame member is a catwalk handrail extending horizontally or diagonally up and down. When tying the auxiliary rope 220 to the steel frame member 250 extending horizontally or diagonally up and down, it is desirable to prevent the auxiliary rope 220 from sliding along the extension direction of the steel frame member 250. For this reason, for example, it is desirable to attach a position regulating metal fitting 251 that regulates the horizontal position of the auxiliary rope 220 to the steel frame member 250 to prevent the auxiliary rope 220 from sliding.

[0045] When the hanging bolt 40 breaks or is broken, the auxiliary rope 220 suspends and supports the ceiling 10 in place of the broken or broken hanging bolt 40, thereby preventing the ceiling 10 from falling. Note that the auxiliary ropes 220 do not need to be connected in a taut state. Also, each auxiliary rope 220 does not need to be the same length.

[0046] <<Reinforcement bonding layer>> Fig. 6 is a diagram for explaining a reinforcing means in a ceiling fall prevention system, (a) being a plan view, (b) being a perspective view, and (c) being an enlarged perspective view of a part around a rope support member. Figs. 7(a) to (d) are cross-sectional views along lines AA, BB, CC, and DD in Fig. 6(a), respectively.

[0047] The ceiling fall prevention system 200 can be provided with, as a reinforcing means, a reinforcing bonding layer 260 formed continuously on the side surface 24 of the rafter 21A (21, first rafter) to which the rope support member 210 is fixed and the upper surface of the ceiling material 11. The reinforcing bonding layer 260 is disposed on both sides of the rafter 21A.

[0048] The reinforcing bonding layer 260 is composed of a resin layer formed to a predetermined thickness. As shown in FIG. 6(c) and the like, the reinforcing bonding layer 260 is generally L-shaped in cross-sectional view of the rafter 21A (cutting view perpendicular to the longitudinal direction of the rafter 21A). The resin constituting the reinforcing bonding layer 260 is preferably a polyurea resin. Other examples of resins that can constitute the reinforcing bonding layer 260 include urethane resin, epoxy resin, acrylic resin, and the like. The reinforcing bonding layer 260 may be a film, net, or rubber sheet attached to the ceiling material 11 and the rafter 21A. The thickness of the resin constituting the reinforcing bonding layer 260 is set to a thickness that allows the reinforcing bonding layer 260 to protect the ceiling 10 without breaking when the auxiliary ropes 220 suspend and support the ceiling 10 in place of the hanging bolts 40. For example, when the resin is polyurea, the thickness of the reinforcing bonding layer 260 is set to about 4 mm.

[0049] As shown in Figs. 7(c) and (d), the reinforcing joint layer 260 is formed between two adjacent sill supports 31, 31 with the mounting point of the rope support member 210 sandwiched therebetween. As shown in FIG. 6( c ), the reinforcing bonding layer 260 includes a side covering portion 261 that covers the side surface rising from the upper surface of the ceiling material 11 , and an upper surface covering portion 262 that covers the upper surface of the ceiling material 11 . The side covering portion 261 covers the side surface 24 of the siding 21A and the side plate portion 213 of the rope support member 210. The side covering portion 261 covers the bolt B and nut N (see FIG. 4(b)) that fasten the rope support member 210 and the siding 21A.

[0050] The upper surface covering portion 262 includes a wide portion 263 located at the periphery of the rope support member 210 and at a relatively large distance from the joist 21A, and a narrow portion 264 located at another portion and at a relatively small distance from the joist 21A. Screws 265 that mechanically join the ceiling material 11 and the reinforcing joining layer 260 are driven into the surface of the wide portion 263.

[0051] The wide portion 263 of the reinforcing joint layer 260 prevents damage (crushing) of the ceiling material 11 in the area surrounding the rope support member 210 when the hanging bolt 40 breaks or breaks and the ceiling material 11 or the like is supported by the auxiliary rope 220. The size (width and length) of the wide portion 263 is set so that the ceiling 10 is not damaged by an impact applied to the area surrounding the rope support member 210 when the auxiliary rope 220 supports the ceiling 10. The reinforcing joint layer 260 firmly connects the rafters 21A and the rope support member 210 to the ceiling material 11. The reinforcing joint layer 260 prevents the rope support member 210 from coming off the rafters 21A. When the ceiling material 11 or the like is supported by the auxiliary rope 220, the reinforcing joint layer 260 disperses the impact transmitted to the ceiling material 11 or the like via the rope support member 210.

[0052] <<<Method for forming reinforcing bonding layer>>> The reinforcing bonding layer 260 can be formed by spraying resin or by hand painting with a brush. When hand painting the resin, a form that can be placed on the upper surface of the ceiling material 11 and can be detached is used to separate the area to which the resin should be applied from the other areas. 8 is a perspective view for explaining an example of a form for producing a reinforcing joint layer. In this figure, only one side of the joist support 31 from the rope support member 210 is shown. The formwork 270 is a partition wall with a predetermined thickness and height. The formwork 270 determines the outer edge shape of the reinforcing bonding layer 260 on the upper surface of the ceiling material 11. The formwork 270 is made of casting or plastic, etc., and a release agent is applied to the contact surface 271 with the resin to prevent adhesion of the resin.

[0053] The formwork 270 is placed between two adjacent sill supports 31, and resin is filled between the formwork 270 and the sill 21A. The resin is also applied to a predetermined thickness onto the side surface 24 of the sill 21A and the surface of the side plate portion 61 of the rope support member 210. The formwork 270 is removed after the resin has had a tactile dry time (the time it takes for the resin to stick to the finger even when lightly touched with a finger). This produces the reinforcing bonding layer 260 shown in Figures 6 and 7.

[0054] When a polyurea resin is used as the reinforcing bonding layer 260, the touch-dry time is about 10 seconds to several tens of seconds. When a reusable formwork 270 is used to form the reinforcing bonding layer 260, work efficiency is improved compared to when a disposable protective sheet or the like is used.

[0055] <<First reinforcement material>> 6 and 7, the ceiling fall prevention system 200 can be provided with a pair of first reinforcing members 281, 281 as a reinforcing means, which are arranged across a pair of sills 21B, 21B (21, second sills) adjacent to the sill 21A to which the rope support member 210 is fixed. The two sills 21B, 21B sandwich the sill 21A between them. The two first reinforcing members 281, 281 are also arranged to sandwich the rope support member between them.

[0056] The first reinforcing material 281 is made of the same material as the furring strip support 31, and is disposed directly above the furring strips 21A, 21B, and 21B in the same orientation as the furring strip support 31. For this reason, a detailed description of the first reinforcing material 281 will be omitted. The first reinforcing member 281 is disposed perpendicular to (intersects) the siding 21 and parallel to the siding support 31. The first reinforcing member 281 is configured to be shorter than the siding support 31. The first reinforcing member 281 is connected to the sidings 21A, 21B, and 21B that intersect with it by clips 60 shown in FIG. The first reinforcing members 281, 281 are disposed so as to sandwich the wide portion 263 of the reinforcing bonding layer 260 therebetween.

[0057] The first reinforcing member 281 suppresses in-plane deformation of the ceiling material 11 around the attachment point of the rope support member 210. In addition, when the auxiliary rope 220 supports the load of the ceiling 10 or the like (see FIG. 1) due to breakage or rupture of the suspension bolt 40, the first reinforcing member 281 distributes the load applied to the vicinity of the rope support member 210, thereby effectively exerting the fail-safe function.

[0058] <<Second reinforcement material>> The ceiling fall prevention system 200 can be provided with, as a reinforcing means, second reinforcing members 282, 282 that connect two adjacent sill supports 31, 31 with the rope support member 210 sandwiched between them. The second reinforcing material 282 is made of the same material as the first reinforcing material 281 (and the furring strip support 31). The second reinforcing material 282 is disposed directly above the first reinforcing material 281 and the furring strip support 31, in the same position as the first reinforcing material 281 (and the furring strip support 31). For this reason, a detailed description of the second reinforcing material 282 will be omitted.

[0059] The second reinforcing member 282 is disposed perpendicular (intersecting) to the first reinforcing member 281 and the furring strip support 31, and parallel to the furring strip 21. The second reinforcing member 282 is configured to be shorter than the furring strip 21. The second reinforcing member 282 is connected to the first reinforcing member 281 and the furring strip support 31 that intersect with the second reinforcing member 282 by a connecting member 290. The second reinforcing members 282, 282 are disposed so as to sandwich the wide portion 263 of the reinforcing bonding layer 260 therebetween.

[0060] The second reinforcing member 282 suppresses in-plane deformation of the ceiling material 11 around the attachment point of the rope support member 210. In addition, when the suspension bolt 40 breaks or breaks and the auxiliary rope 220 supports the load of the ceiling 10 or the like (see FIG. 1), the second reinforcing member 282 distributes the load applied to the vicinity of the rope support member 210, thereby effectively demonstrating the fail-safe function.

[0061] <<Connecting material>> The connecting material 290 connects the second reinforcing material 282 to the first reinforcing material 281 or the sill support 31. The connecting material 290 is made of galvanized steel, stainless steel, etc. The connecting material 290 is made of a so-called angle material having a generally L-shaped cross section. That is, the connecting material 290 has a configuration in which the edges of two rectangular plate materials 291, 291 are connected so that the plate surfaces of the two plate materials 291, 291 are perpendicular to each other.

[0062] The connecting member 290 is disposed so that its longitudinal direction extends in the vertical direction. One plate member 291 of the connecting member 290 is fastened to the first reinforcing member 281 or the siding support 31 with a bolt and nut in a state where its outer surface is affixed to the ventral side (web) of the first reinforcing member 281 or the siding support 31, and the other plate member 291 is fastened to the second reinforcing member 282 with a bolt and nut in a state where its outer surface is affixed to the ventral side (web) of the second reinforcing member 282.

[0063] The connecting material 290 prevents the second reinforcing material 282 and the first reinforcing material 281 or the sill support 31 from being displaced in the shape of a parallelogram.

[0064] <Construction method> An example of a method for installing the ceiling fall prevention system 200 will be described with reference to Figs. 1 and 3 to 8.

[0065] The ceiling fall prevention system 200 can be installed in a similar manner on an existing ceiling 10 and a newly constructed ceiling 10, as long as the ceiling 10 is suspended from the hanging point S. 1 and 6 show an example in which the sill supports 31 are arranged at 900 mm intervals and the sills 21 are arranged at 300 mm intervals. In the figures, the rope support members 210 are arranged at a rate of one per 900 mm x 900 mm grid (per section).

[0066] First, the rope support member 210 is fixed to the rafter 21A (21). That is, as shown in Fig. 4, the rope support member 210 is placed on the rafter 21 so that the rafter 21 is inserted into the recess 214 of the base part 211, and then the base part 211 is fastened to the rafter 21 using the bolt B and nut N.

[0067] Next, the reinforcing bonding layer 260 is formed. That is, a formwork 270 (FIG. 8) is placed on the side of the siding 21A and between two adjacent siding supports 31, and the resin constituting the reinforcing bonding layer 260 is filled between the formwork 270 and the siding 21A. The resin is also applied to the side plate portion 61 of the rope support member 210 and the surface of the side surface 24 of the siding 21A. After the resin has passed the touch-dry time, the formwork 270 is removed. Also, screws 265 are driven from above into appropriate locations (for example, each corner) of the wide portion 263 of the reinforcing bonding layer 260 to mechanically bond the ceiling material 11 and the reinforcing bonding layer 260 (FIG. 6(a)).

[0068] Next, the first reinforcing members 281, 281 are attached. That is, a pair of first reinforcing members 281, 281 are arranged so as to sandwich the rope support member 210 therebetween and to straddle the two joists 21B, 21B adjacent to the joist 21A to which the rope support member 210 is fastened. The first reinforcing members 281, 281 are connected to the joists 21A, 21B, 21B that they intersect with using clips 60 (see FIG. 3).

[0069] Furthermore, the second reinforcing members 282, 282 are attached. That is, a pair of second reinforcing members 282, 282 are arranged to sandwich the rope support member 210 therebetween and to straddle two adjacent siding supports 31, 31 with the rope support member 210 sandwiched therebetween. Using connecting members 290 (FIGS. 6 and 7), bolts, and nuts, the second reinforcing member 282 is connected to each of the first reinforcing members 281 and siding supports 31 that the second reinforcing member 282 crosses. The first reinforcing members 281, 281 and the second reinforcing members 282, 282 are arranged in a lattice pattern (# shape) so as to surround the rope support member 210. In the illustrated example, the first reinforcing members 281, 281 and the second reinforcing members 282, 282 are arranged in a lattice pattern so as to surround the wide portions 263, 263 of the reinforcing bonding layer 260.

[0070] Finally, the lower end of the auxiliary rope 220 is connected to the ring portion 215 of the rope support member 210 by a bowline knot or the like, and the upper end of the auxiliary rope 220 is connected to a suitable location above the rope support member 210 by a bowline knot or the like (Figure 5). This completes the installation of the ceiling fall prevention system 200. Note that the installation procedure is an example. The installation order may be changed as appropriate. The ceiling fall prevention system 200 is disposed between the ceiling material 11 and the hanging point S, and is installed so as not to appear on the underside of the ceiling material 11. Therefore, it does not impair the appearance of the ceiling surface (the underside of the ceiling material 11).

[0071] [Modifications] In the fall prevention structure 1, the ceiling vibration control system 100 is installed as necessary. In the ceiling fall prevention system 200, the reinforcing bonding layers 260, 260, the first reinforcing members 281, 281, and the second reinforcing members 282, 282 are installed as necessary.

[0072] [Summary of the embodiment, action and effect of the present invention] <First embodiment> This embodiment is a fall prevention structure for a suspended ceiling 10 in which a ceiling material 11 is suspended and supported by a suspension bolt 40 fixed to a suspension point S. This embodiment is characterized by comprising a rope support member 210 having a base portion 211 fixed to a first siding 21A and a ring portion 215 supported by the base portion, an auxiliary rope 220 having one longitudinal end 220a connected to the ring portion and the other longitudinal end 220b connected to an appropriate position located above the rope support member, and a reinforcing joining layer 260 formed continuously with the side surface 24 of the first siding and the upper surface of the ceiling material.

[0073] When the suspension bolts break or break and the suspended ceiling loses support from the suspension bolts, the auxiliary ropes support the load of the suspended ceiling in place of the suspension bolts. The reinforcing joint layer firmly connects the first siding and the ceiling material, preventing them from separating. When the ceiling material is supported by the auxiliary rope, the reinforcing joint layer disperses the impact transmitted to the ceiling material through the rope support member. According to this aspect, it is possible to prevent the suspended ceiling from falling without impairing the appearance of the ceiling surface.

[0074] <Second and fourth embodiments> In the fall prevention structure of this embodiment, the base portion 211 of the rope support member 210 comprises an upper plate portion 212 placed on the first sill 21A, and a pair of side plate portions 213 extending downward from each opposing end edge of the upper plate portion and attached to each side surface 24 of the first sill, and both side plate portions are fastened to the first sill using fastening members (bolt B, nut N). Of the reinforcing bonding layer 260, the side covering portion 261 that covers the side surface of the first siding is characterized by continuously covering the side surface of the first siding, the side plate portion of the rope support member, and the fastening member.

[0075] According to this embodiment, the reinforcing bonding layer firmly connects the first siding and the rope support member to the ceiling material 11, preventing them from being separated. In addition, the reinforcing bonding layer continuously covers the first siding and the rope support member, preventing the rope support member from coming off the first siding.

[0076] <Third and fourth embodiments> In the fall prevention structure of this embodiment, the upper surface covering portion 262 of the reinforcing bonding layer 260 that covers the upper surface of the ceiling material 11 is characterized by having a wide portion 263 located in the peripheral portion of the rope support member 210 and at a relatively large distance from the first nobility 21A, and a narrow portion 264 located in another portion and at a relatively small distance from the first nobility. When the suspended ceiling 10 loses support from the suspension bolts due to breakage or rupture of the suspension bolts 40, the auxiliary ropes 220 support the load of the suspended ceiling in place of the suspension bolts. At the moment when the auxiliary ropes support the suspended ceiling, a particularly large load is applied to the periphery of the auxiliary ropes and the rope support members. According to this aspect, the area of ​​the reinforcing joint layer formed on the upper surface of the ceiling material around the rope support member is increased, so that the resistance to the load is improved. Therefore, when the auxiliary rope supports the suspended ceiling, damage (crushing) of the ceiling material around the rope support member can be prevented.

[0077] <Fifth embodiment> The fall prevention structure of the present embodiment is characterized in that it comprises a pair of first reinforcing members 281, 281 that are adjacent to the first sill 21A, span between a pair of second sills 21B, 21B that sandwich the first sill between them, and are arranged so as to sandwich the rope support member 210 between them, and each first reinforcing member is fixed to the first sill and each second sill. According to this embodiment, it is possible to suppress in-plane deformation of the suspended ceiling 10 (ceiling material 11) around the attachment point of the rope support member, even if the auxiliary rope 220 supports the suspended ceiling due to breakage or rupture of the suspension bolt 40. Furthermore, when the auxiliary rope 220 supports the suspended ceiling 10, the first reinforcing member distributes the load applied to the vicinity of the rope support member, thereby preventing damage to each part.

[0078] <Sixth embodiment> The fall prevention structure of the present embodiment is characterized in that it comprises a pair of second reinforcing members 282, 282 arranged parallel to the first sill 21A so as to sandwich the first sill 21A therebetween, and each second reinforcing member is fixed to a pair of sill supporters 31, 31 adjacent to the rope support member 210 and each first reinforcing member 281, 281. According to this embodiment, it is possible to suppress in-plane deformation of the suspended ceiling 10 (ceiling material 11) around the attachment point of the rope support member, even if the auxiliary rope 220 supports the suspended ceiling due to breakage or rupture of the suspension bolt 40. In addition, when the auxiliary rope 220 supports the suspended ceiling 10, the second reinforcing member distributes the load applied to the vicinity of the rope support member, preventing damage to each part.

[0079] <Seventh embodiment> In the fall prevention structure of this embodiment, the auxiliary rope 220 is made of a synthetic fiber rope having flexibility that allows knots to be made, and each end 220a, 220b of the auxiliary rope is connected to the component to which it is to be connected by utilizing the knots formed at each end. The auxiliary rope, made of synthetic fiber, is very lightweight and can be folded and bundled for easy transport. In addition, the installation of the auxiliary rope can be completed by tying it to the component to which it is to be connected, which shortens the construction time.

[0080] <Eighth embodiment> The fall prevention structure of this embodiment comprises a ceiling vibration control system arranged between the hanging point and the suspended ceiling, the ceiling vibration control system comprising a hanging bolt, a first damper and a second damper arranged at an angle opposite to each other to dampen vibrations occurring in the suspended ceiling, and a bundle extending in the vertical direction to suppress out-of-plane deformation of the suspended ceiling due to expansion and contraction of the first damper and second damper, the bundle being characterized in that it is arranged in a position different from the hanging bolt. According to this aspect, the acceleration of the ceiling during an earthquake can be reduced and the shaking of the ceiling can be damped early, thereby suppressing damage to the ceiling. [Explanation of symbols]

[0081] S...suspension point, SW...main wall, B...bolt (fastening member), N...nut (fastening member), 1...fall prevention structure, 10...ceiling (suspended ceiling), 11...ceiling material, 12...ceiling base material, 21...rough siding, 21A...rough siding (first siding), 21B...rough siding (second siding), 22...lip, 23...void, 24...side, 31...rough siding support, 32...web, 33...upper flange, 40...suspension bolt, 50...hanger, 60...c Lip, 61...side panel portion, 62...lower retaining portion, 63...upper retaining portion, 64...attachment portion, 65...retaining piece, 100...ceiling vibration control system, 106...first damper, 106a...first joint, 107...second damper, 107a...second joint, 108...strut, 109a...first auxiliary fitting, 109b...second auxiliary fitting, 110a...first assembly, 110b...second assembly, 113...lower fixing fitting, 114a...first upper upper fixing bracket, 114b...second upper fixing bracket, 114c...third upper fixing bracket, 200...ceiling fall prevention system, 210...rope support member, 211...base portion, 212...upper plate portion, 213...side plate portion, 214...recess, 215...ring portion, 220...auxiliary rope, 220a...one end portion, 220b...other end portion, 221...annular portion, 230...locking bracket (third connecting bracket), 231...mounting portion, 232...ro 270...formwork, 271...contact surface, 281...first reinforcing member, 282...second reinforcing member, 290...connecting member, 291...plate material, 260...reinforcing joint layer, 261...side covering member, 262...upper covering member, 263...wide portion, 264...narrow portion, 265...screw, 270...formwork, 271...contact surface, 281...first reinforcing member, 282...second reinforcing member, 290...connecting member, 291...plate material

Claims

1. A fall prevention structure for a suspended ceiling in which a ceiling material is suspended and supported by a suspension bolt fixed to the suspension base, A rope support member having a base portion fixed to the first decking and a ring portion supported by the base portion; an auxiliary rope having one end in a longitudinal direction connected to the ring portion and the other end in a longitudinal direction connected to an appropriate position located above the rope support member; A fall prevention structure characterized by having a reinforcing bonding layer formed continuously on the side of the first sill and the upper surface of the ceiling material.

2. A fall prevention structure for a suspended ceiling in which a ceiling material is suspended and supported by a suspension bolt fixed to the suspension base, A rope support member having a base portion fixed to the first decking and a ring portion supported by the base portion; an auxiliary rope having one end in a longitudinal direction connected to the ring portion and the other end in a longitudinal direction connected to an appropriate position located above the rope support member; A reinforcing bonding layer is formed continuously on the side surface of the first frame and the upper surface of the ceiling material, The base portion of the rope support member includes an upper plate portion placed on the first sill and a pair of side plate portions extending downward from the opposing end edges of the upper plate portion and attached to each side surface of the first sill, and the both side plate portions are fastened to the first sill using fastening members, A fall prevention structure characterized in that the side covering portion of the reinforcing bonding layer that covers the side surface of the first sill continuously covers the side surface of the first sill, the side plate portion of the rope support member, and the fastening member.

3. A fall prevention structure for a suspended ceiling in which a ceiling material is suspended and supported by a suspension bolt fixed to the suspension base, A rope support member having a base portion fixed to the first decking and a ring portion supported by the base portion; an auxiliary rope having one end in a longitudinal direction connected to the ring portion and the other end in a longitudinal direction connected to an appropriate position located above the rope support member; A reinforcing bonding layer is formed continuously on the side surface of the first frame and the upper surface of the ceiling material, A fall prevention structure characterized in that the upper surface covering portion of the reinforcing joining layer that covers the upper surface of the ceiling material has a wide portion located in the peripheral portion of the rope support member and at a relatively large distance from the first soffit, and a narrow portion located in another portion and at a relatively small distance from the first soffit.

4. A fall prevention structure for a suspended ceiling in which a ceiling material is suspended and supported by a suspension bolt fixed to the suspension base, A rope support member having a base portion fixed to the first decking and a ring portion supported by the base portion; an auxiliary rope having one end in a longitudinal direction connected to the ring portion and the other end in a longitudinal direction connected to an appropriate position located above the rope support member; A reinforcing bonding layer is formed continuously on the side surface of the first frame and the upper surface of the ceiling material, The base portion of the rope support member includes an upper plate portion placed on the first sill and a pair of side plate portions extending downward from the opposing end edges of the upper plate portion and attached to each side surface of the first sill, and the both side plate portions are fastened to the first sill using fastening members, The side covering portion of the reinforcing bonding layer that covers the side surface of the first frame continuously covers the side surface of the first frame, the side plate portion of the rope support member, and the fastening member, A fall prevention structure characterized in that the upper surface covering portion of the reinforcing joining layer that covers the upper surface of the ceiling material has a wide portion located in the peripheral portion of the rope support member and at a relatively large distance from the first soffit, and a narrow portion located in another portion and at a relatively small distance from the first soffit.

5. A pair of first reinforcing members are provided adjacent to the first sill and straddle a pair of second sills sandwiching the first sill therebetween, and are arranged so as to sandwich the rope support member therebetween; A fall prevention structure as described in any one of claims 1 to 4, characterized in that each of the first reinforcing members is fixed to the first sill and each of the second sills.

6. A pair of second reinforcing members is provided, the pair of second reinforcing members being arranged in parallel with the first furring strip so as to sandwich the first furring strip therebetween; A fall prevention structure as described in claim 5, characterized in that each of the second reinforcements is fixed to a pair of sill supports adjacent to the rope support member and each of the first reinforcements.

7. The fall prevention structure described in claim 6, characterized in that the auxiliary rope is made of a synthetic fiber rope having flexibility that allows knots to be made, and each end of the auxiliary rope is connected to a corresponding member using the knots formed at each end.

8. A ceiling vibration control system is provided between the suspension point and the suspended ceiling, The ceiling vibration control system includes the suspension bolt, a first damper and a second damper arranged at an angle opposite to each other to damp vibrations occurring in the suspended ceiling, and a brace extending in the vertical direction to suppress out-of-plane deformation of the suspended ceiling caused by expansion and contraction of the first damper and the second damper, The fall prevention structure according to any one of claims 1 to 4, characterized in that the bundle is arranged at a position different from the suspension bolt.

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