Ceiling fall prevention structure

Abstract

To provide a ceiling fall prevention structure excellent in workability even in an attic having limitation in a work space.SOLUTION: A ceiling fall prevention structure is provided with: a plurality of suspended members (12) suspended from a frame body (17) of a structure; a support member (15) placed on the plurality of suspended members (12) so as to be adjacent to a ceiling substrate (5) of a suspended ceiling structure (1); and engagement means (16) attached on the support member (15) and the suspended ceiling structure (1). When the suspended ceiling structure falls down by a specific amount, the engagement means (16) is supported by the support member (15).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ceiling fall prevention structure that prevents a ceiling from falling. [Background technology]

[0002] A conventional ceiling structure consists of multiple hanging bolts hanging from the frame of a building structure, soffit supports suspended horizontally by the hanging bolts, soffits attached perpendicular to the soffit supports, and ceiling surface materials screwed to the soffits.

[0003] In the above-mentioned ceiling structure, as a measure to prevent the ceiling structure from falling in the event of an earthquake, the hangers that hold the soffit holders on the hanging bolts are covered with soffit holder fall prevention devices to prevent the soffit holders from falling off (see Patent Document 1), which prevents the ceiling from shaking due to an earthquake or other cause and the soffit holders from coming off the hanging bolts. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-177400 Summary of the Invention [Problem to be solved by the invention]

[0005] However, there is a problem in that if the hanging bolts and the furring strip mounting brackets that attach the furring strips to the furring strip holders in Patent Document 1 break due to shaking such as an earthquake, the ceiling surface material may fall. In addition, there is a problem in that the ceiling space is occupied by various equipment such as air conditioning equipment, audio equipment, and fire extinguishing equipment, as well as piping equipment, making it difficult to secure work space to implement fall prevention measures in various ceiling structures where hanging bolts cannot be installed. Also, there is a problem in that the furring strip holder fall prevention device in Patent Document 1 is difficult to work with in order to cover the hanger with the furring strip holder fall prevention device in an existing ceiling structure.

[0006] Therefore, an object of the present invention is to provide a ceiling fall prevention structure that is easy to install even in an attic space where working space is limited. [Means for solving the problem]

[0007] The invention of claim 1 is as follows: Hanging A ceiling fall prevention structure that prevents a suspended ceiling structure from falling, The suspended ceiling structure includes a suspension bolt suspended from the framework of the structure, a joist support supported by the suspension bolt, a joist supported by the joist support, and a ceiling surface material supported by the joist. The ceiling fall prevention structure is Multiple hanging materials suspended from the body; The above-mentioned veranda and a locking means attached to the support member and the suspended ceiling structure, wherein the locking means is supported by the support member when the suspended ceiling structure is lowered by a predetermined amount.

[0008] The invention of claim 2 is hanging Hanging material Shake It is characterized by having an upper mounting bracket that holds it movably.

[0009] The invention of claim 3 is Support member The above Hanging material The present invention is characterized by the provision of a support member mounting bracket that holds the support member in a swingable manner.

[0010] The invention of claim 4 is characterized in that the locking means is a locking means for connecting the support member and the suspended ceiling structure. The above-mentioned veranda The wire member is characterized by connecting the above.

[0011] The invention of claim 5 is characterized in that the support member mounting bracket has a bracket body with openings on both sides, and the support member is inserted into and held in the bracket body. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a ceiling fall prevention structure that is easy to install even in an attic space where working space is limited. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view showing a ceiling structure and a ceiling fall prevention structure according to a first embodiment of the present invention. [Figure 2]FIG. 1 is a plan view showing the ceiling structure and the ceiling fall prevention structure. [Figure 3] FIG. 10 is a side view showing the ceiling structure and the ceiling fall prevention structure. [Figure 4] FIG. 10 is a side view showing a part of the ceiling fall prevention structure. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 10 is a perspective view showing the ceiling fall prevention structure in operation. [Figure 10] FIG. 10 is a perspective view showing a different implementation state of the ceiling fall prevention structure. [Figure 11] FIG. 10 is a perspective view showing a different implementation state of the ceiling fall prevention structure. [Figure 12] FIG. 10 is a plan view showing a different implementation of the ceiling fall prevention structure. [Figure 13] FIG. 10 is a perspective view showing the state in which the ceiling fall prevention structure is implemented in a different ceiling structure. [Figure 14] FIG. 10 is a perspective view showing a ceiling structure and a ceiling fall prevention structure according to a second embodiment of the present invention. [Figure 15] FIG. 10 is a side view showing the ceiling structure and the ceiling fall prevention structure. [Figure 16] FIG. 10 is a perspective view showing a ceiling structure and a ceiling fall prevention structure according to a third embodiment of the present invention. [Figure 17] FIG. 10 is a side view showing the ceiling structure and the ceiling fall prevention structure. BEST MODE FOR CARRYING OUT THE INVENTION

[0014] Preferred embodiments of the present invention will be described with reference to the accompanying drawings. Note that the embodiments described below do not limit the content of the present invention as defined in the claims. Furthermore, not all of the configurations described below are necessarily essential requirements of the present invention. Example 1

[0015] 1 to 13 show a first embodiment of the present invention. FIG. 1 is a perspective view of a ceiling structure to which a ceiling fall prevention structure according to the first embodiment of the present invention is applied. Ceiling structure 1, which is a suspended ceiling structure, includes suspension bolts 3 suspended from a structural frame 2 of a structure, multiple rafters 4 supported by the suspension bolts 3 and extending substantially horizontally, multiple rafters 5 extending substantially horizontally and intersecting the rafters 4 and supported by the rafters 4, and ceiling surface materials 6 attached to the undersides of the rafters 5. Examples of ceiling surface materials 6 include metal spandrels, metal panels, and gypsum boards. In this embodiment, spandrels are used as an example. The rafters 4 and rafters 5 are referred to as ceiling underlayment materials that support the ceiling surface material 6 from above the ceiling. The suspension bolts 3, rafters 4, rafters 5, hangers 7, and clips 8 constitute a suspension structure for suspending and supporting the ceiling surface material 6.

[0016] The soffit support 4 is supported by the hanging bolt 3 by screwing a hanger 7 onto the hanging bolt 3 and fitting the soffit support 4 into the hanger 7.

[0017] At the point where the siding support 4 and the siding 5 intersect, the siding 5 is supported by the siding support 4 by fitting a clip 8 between the siding support 4 and the siding 5.

[0018] Next, we will explain the ceiling fall prevention structure 9 of this embodiment that is used in the above-mentioned ceiling structure 1. As shown in Figure 1, the ceiling fall prevention structure 9 includes a hanging bracket 10 fixed to the structure's frame 17, a joint bracket 11 attached to the hanging bracket 10, a hanging material 12 consisting of a rolled screw (fully threaded) suspended from the joint bracket 11, height adjustment means 13 consisting of a high nut (long nut, joint nut) attached to the bottom of the hanging material 12, a support member mounting bracket 14 provided below the height adjustment means 13, a support member 15 attached to the support member mounting bracket 14 so as to be positioned above the ceiling underlayment, and locking means 16 that allows the joist 5 to be locked to the support member 15.

[0019] Here, the framework 17 includes the beams, upper floors such as slabs, walls, and columns of the structure. The lifting bracket 10 of this embodiment is fixed to the flange 18 of the H-shaped steel 17, which forms a beam located at the top of the space inside the structure. The beam can be any type of steel, including equal angle steel (equal angle steel), unequal angle steel (unequal angle steel), channel steel (channel steel, lip channel steel), I-shaped steel (I-beam), spherical flat steel, T-shaped steel, CT-shaped steel, flat steel, Z-shaped steel, hat steel, round steel, square steel, and hexagonal steel, as well as steel with an asymmetric cross-sectional shape. The lifting bracket 10 may also be fixed to various steel shapes, which are secondary members installed on multiple beams (primary members) fixed inside the structure.

[0020] As shown in Figures 4 and 5, the hanging hardware 10 is a metal piece that is roughly C-shaped when viewed from the side, and consists of an upper horizontal portion 19, a lower horizontal portion 20 that is arranged parallel to the upper horizontal portion 19, and a vertical portion 21 that connects one end of the upper horizontal portion 19 and one end of the lower horizontal portion 20.

[0021] Flange 18 of H-shaped steel 17 is placed between upper horizontal section 19 and lower horizontal section 20, and upper fixing bolt 23 threaded into upper fixing nut 22 attached to the opening side of upper horizontal section 19 is moved up and down to clamp and release flange 18, thereby engaging lifting bracket 10 to flange 18 of H-shaped steel 17. A support bolt of joint fitting 11, described below, is attached to lower fixing nut 24 attached to the opening side of lower horizontal section 20. Lifting bracket 10 also has a hook-shaped retaining member 10A that can engage with flange 18A on the opposite side of flange 18 to which upper horizontal section 19 and lower horizontal section 20 are attached.

[0022] As shown in Figures 4 and 6, the joint fitting 11 comprises a fitting body 25, a support bolt 26, and a fixing nut 27. The fitting body 25 comprises a top wall 28 having an inverted U-shaped or inverted V-shaped cross section in the front-to-rear direction, which in this embodiment is an inverted U-shaped cross section, a pair of upright walls 29, 29 arranged opposite each other so as to cover both the front and rear of the top wall 28, and a bottom wall 30 that closes the space between the lower ends of the upright walls 29, 29. A long hole 31 is formed in the top wall 28 in the front-to-rear direction, passing through the top of the top in the front-to-rear direction and extending in the direction intersecting the top. A through hole 32 is formed in the bottom wall 30, and a fixing nut 27 for screwing the hanging material 12 is arranged to close the through hole 32.

[0023] The metal fitting body 25 is formed by pressing a strip-shaped metal plate, and its top wall 28, upright walls 29, 29 and bottom wall 30 are bent and formed into a box shape with both sides open.

[0024] The support bolt 26 has a bolt head 34 and a bolt shank 35. A rotation support portion 36 is disposed on the back surface of the bolt head 34, and its radius of curvature is set to be the same as the radius of curvature of the top of the top wall 28. This allows the rotation support portion 36 of the support bolt 26 to make point contact with the edge of the elongated hole 31 in the top wall 28, thereby minimizing frictional resistance. The rotation support portion 36 is formed on the back surface of the bolt head 34 by building up from its outer periphery upward to form, for example, a hemispherical cross section, while the support bolt 26 itself faces downward, forming a curved surface that bulges out in an arc. The bolt head 34 also has a screwdriver receiving groove (not shown) on its surface. A screwdriver can be inserted through the female threaded hole of the fixing nut 27, and the support bolt 26 can be threaded into the lower fixing nut 24 by operating the screwdriver. In this case, the receiving groove is a cross recess or a slot (flat head) as per usual.

[0025] The support bolt 26 has a large diameter step 37, for example, rectangular or trapezoidal in cross section, in this example a truncated cone that is trapezoidal and circular in plan, disposed between the base of the bolt head 34 and the bolt shank 35, and by setting the width of the elongated hole 31 in the metal fitting body 25 to be slightly wider than the outer diameter of the large diameter step 37, the large diameter step 37 is formed by a step that is integral with the support bolt 26 disposed between the rotation support part 36 and bolt shank 35 of the support bolt 26.

[0026] In this case, when the support bolt 26 is threaded into the lower fixing nut 24, the thickness of the top wall 28 of the metal fitting body 25 is within the height range of the large diameter step 37. As a result, even if the support bolt 26 is threaded so as to be firmly fastened to the lower fixing nut 24 installed on the hanging metal fitting 10, a gap is formed between the support bolt 26 and the top wall 28, so that the oscillating rotation of the metal fitting body 25 is not hindered. In this example, the height of the large diameter step 37 is made higher than the thickness of the top wall 28 of the metal fitting body 25.

[0027] In addition, a washer 38 is disposed at the boundary between the bolt shaft 35 and the large-diameter step 37. The washer 38 is made of a hexagonal metal plate with a female thread formed in the center, and is screwed onto the bolt shaft 35. As a result, even when the support bolt 26 is screwed firmly into the lower fixing nut 24, the washer 38 abuts against the underside of the lower horizontal portion 20 of the hanging fitting 10, preventing the support bolt 26 from sinking into the lower horizontal portion 20 of the hanging fitting 10 and providing a variety of effects, such as maintaining the vertical spacing required for the oscillating rotation of the fitting body 25 by the large-diameter step 37 and preventing the support bolt 26 from loosening.

[0028] The joint fitting 11 has a support bolt 26 screwed into the lower fixed nut 24 of the hanging fitting 10 and the hanging material 12 screwed into the fixed nut 27, so that the hanging support angle of the hanging material 12 can be freely adjusted by swiveling rotation of the fitting body 25, and in this case, the joint fitting 11 has a large diameter step portion 37 arranged on the rotating support portion 36 of the support bolt 26, the large diameter step portion 37 having an outer diameter larger than the shaft diameter of the bolt shaft 35 and smaller than the width of the long hole 31 in the top wall 28, and a height greater than the thickness of the top wall 28, and in this example, the large diameter step portion 37 is flat and circular, and is formed by a step portion integral with the support bolt 26 arranged between the rotating support portion 36 and bolt shaft 35 of the support bolt 26.

[0029] 4 and 7, the support member mounting bracket 14 comprises a bracket body 39 and a support bolt 40. The bracket body 39 comprises a top wall 41 having an inverted U-shaped or inverted V-shaped cross section in the front-to-rear direction, inverted U-shaped in this embodiment, a pair of upright walls 42, 42 arranged opposite each other so as to cover both the front and rear of the top wall 41, and a bottom wall 43 closing the space between the lower ends of the upright walls 42, 42. A long hole 44 is provided in the top wall 41, passing through the top of the top wall 41 in the front-to-rear direction and pointing in the direction intersecting the top.

[0030] The metal fitting body 39 is formed by bending a top wall 41, upright walls 42, 42 and a bottom wall 43, and is shaped like a box with both sides open.

[0031] In the metal fitting body 39, the shape of the opening surrounded by the upright walls 42, 42 and the bottom wall 43 corresponds to the cross-sectional shape of the support member 15. The pair of upright walls 42, 42 each have a mounting hole 46 for fixing the support member 15 inserted into the inside of the metal fitting body 39 with a screw B or the like.

[0032] The support bolt 40 has a bolt head 47 and a bolt shaft 48. A rotation support portion 49 is disposed on the back surface of the bolt head 47, and its radius of curvature is made the same as the radius of curvature of the top of the top wall 41, so that the rotation support portion 49 of the support bolt 40 comes into point contact with the edge of the elongated hole 44 in the top wall 41, thereby reducing frictional resistance as much as possible. The rotation support portion 49 is formed on the back surface of the bolt head 47 by building up from its outer circumferential edge upward to form, for example, a hemispherical cross section, while the support bolt 40 itself faces downward, forming a curved surface that bulges out in an arc. In addition, a screwdriver receiving groove (not shown) is disposed on the surface of the bolt head 47, so that the support bolt 40 can be threaded into height adjustment means 13, such as a high nut, by operating the screwdriver.

[0033] The support bolt 40 has a large diameter step 50, for example, rectangular or trapezoidal in cross section, in this example a truncated cone that is trapezoidal and circular in plan view, disposed between the base of the bolt head 47 and the bolt shaft 48, and by setting the width of the elongated hole 44 of the metal fitting body 39 to be slightly wider than the outer diameter of the large diameter step 50, the large diameter step 50 is formed by a step portion that is integral with the support bolt 40 disposed between the rotation support part 49 and the bolt shaft 48 of the support bolt 40.

[0034] In this case, when the support bolt 40 is threaded into the height adjustment means 13, the thickness of the top wall 41 of the metal fitting body 38 is within the height range of the large diameter step 50. As a result, even if the support bolt 40 is threaded so as to be firmly fastened to the height adjustment means 13, a gap is formed between the support bolt 40 and the top wall 41, so that the oscillating rotation of the metal fitting body 39 is not hindered. In this example, the height of the large diameter step 50 is made higher than the thickness of the top wall 41 of the metal fitting body 39.

[0035] A washer 51 is disposed at the boundary between the bolt shaft 48 and the large-diameter step 50. The washer 51 is made of a hexagonal metal plate with a through-hole formed in the center through which the bolt shaft 48 can be inserted, and is screwed onto the bolt shaft 48. As a result, even when the support bolt 40 is screwed onto the height adjustment means 13 so as to be firmly fastened, the washer 51 abuts against the underside of the height adjustment means 13, thereby preventing the support bolt 40 from sinking into the height adjustment means 13 and achieving a variety of effects, such as maintaining the vertical spacing for the oscillating rotation of the metal fitting main body 39 by the large-diameter step 50 and preventing the support bolt 49 from loosening.

[0036] As shown in Figure 8, the locking means 16 includes a pair of siding mounting brackets 52, 52 that are attached to the siding 5, and a connecting portion 53 that connects the support member 15 and the siding mounting brackets 52, 52. The siding mounting bracket 52 includes a first siding mounting portion 55, a second siding mounting portion 56, and a female screw portion 57 formed by threading a screw groove into a through-hole formed in the center of the bracket body 54, at the bottom of the bracket body 54, which is made of a rectangular metal thin plate. Here, the female screw portion 57 may be a nut fixed to the bracket body 54.

[0037] The first sill mounting portion 55 is provided with a pair of first raised portions 59, 59 that are raised downward and approximately parallel from a pair of opposing end portions 58, 58 of the metal fitting body 54, and first engaging portions 60, 60 that are formed into an approximately hook-shaped cross section by bending the tips of each of the first raised portions 59, 59 outward so that they are spaced apart from each other.

[0038] The second sill mounting portion 56 is provided with a pair of second raised portions 61, 61 which are raised downward between the first raised portions 59, 59 of the metal fitting body 54 and are generally parallel to the first raised portions 59, and which are formed narrower than the space between the first raised portions 59, 59, and second engaging portions 62, 62 which are formed with a generally hook-shaped cross section by bending the tips of each second raised portion 61, 61 outward so that they are spaced apart from each other.

[0039] The connecting portion 53 includes a wire member 63 and male screw portions 64, 64 that are installed on both ends of the wire member 63 and can be screwed into the female screw portion 57 of the metal fitting body.

[0040] As shown in FIG. 1 , the support member 15 is a metal pipe with a rectangular cross section, a so-called square pipe. The material of the support member 15 is not limited to metal or resin, and the shape of the support member 15 can be a round pipe, a polygonal pipe, or various types of steel, such as equal angle steel (equal angle steel), unequal angle steel (unequal angle steel), channel steel (channel steel, lip channel steel), I-beam, spherical flat steel, T-beam, H-beam, CT-beam, flat steel, Z-beam, hat steel, round steel, square steel, and hexagonal steel, or steel with an asymmetric cross section. In this case, it is preferable to appropriately change the shape of the bracket body 39 of the support member mounting bracket 14 to stably hold the support member 15, which has various cross-sectional shapes, by point contact, line contact, or surface contact at multiple locations.

[0041] Next, we will explain the construction method using the ceiling fall prevention structure 9 of this embodiment. To attach the joint fitting 11 to a newly built or existing ceiling structure 1, as shown in Figure 1, the support bolt 26 is screwed into the lower fixing nut 24 of the hanging fitting 10 attached to the flange 18 of the H-shaped steel 17. When attaching the joint fitting 11 directly to the concrete slab S above the ceiling as shown in Figure 13, the support bolt 26 is attached via an anchor such as a metal anchor or adhesive anchor (not shown).

[0042] Next, the hanging material 12 is attached by screwing the upper part of the hanging material 12 into the fixing nut 27 of the joint fitting 11. The height adjustment means 13 is screwed to the lower part of the hanging material 12.

[0043] Next, to attach support member mounting bracket 14, bolt shaft 48 of support bolt 40 is screwed into the lower part of height adjustment means 13, and support member mounting bracket 14 is attached to the lower part of hanging material 12. The vertical position of support member mounting bracket 14 is adjusted by moving height adjustment means 13 up and down relative to hanging material 12.

[0044] Next, to attach the support member 15 to the support member mounting bracket 14, the support member 15 is inserted into the bracket body 39 of the support member mounting bracket 14 so that the left and right side surfaces and bottom surface of the support member 15 face or make surface contact with the upright walls 42, 42 and bottom wall 43, respectively, and then the left and right side surfaces of the support member 15 are fixed to the upright walls 42, 42 of the support member mounting bracket 14 with screws B through the mounting holes 46. Fixing the support member mounting bracket 14 and the support member 15 with screws B may also be done after the support member 15 and the siding 5, which will be described later, are connected.

[0045] Next, the connection between the support member 15 and the siding 5 is achieved by screwing the male screw portions 64, 64 of the connecting portion 53, on which the wire member 63 is arranged so as to straddle the support member 15 from above, into the female screw portions 57, 57 of a pair of siding mounting brackets 52, 52, which are attached by engaging the first siding mounting portion 55 or the second siding mounting portion 56 with the groove edge 5A of the siding 5 with the support member 15 sandwiched between them, so that the support member 15 is positioned close to the siding 5 with only a small gap L, as shown in Figure 3. In addition to being perpendicular to the plan view as shown in Figure 2, the support member 15 and the siding 5 can be positioned at various angles by taking advantage of the arrangement of the siding mounting brackets 52, 52 and the flexibility of the wire member 63. By having a gap L between the support member 15 and the joist 5, the load of the support member 15, the support member mounting bracket 14, etc. is prevented from becoming a load on the ceiling underlayment materials such as the joist 5 and the ceiling surface material 6, and noise caused by contact between the support member 15 and the joist 5 can be prevented.

[0046] In the above-mentioned ceiling fall prevention structure 9, if the suspension bolts 3, sill supports 4, sills 5, hangers 7 or clips 8 of the suspension structure are damaged due to shaking such as an earthquake, and the suspended state of the ceiling surface by the suspension structure can no longer be maintained, the ceiling surface material 6 is suspended and held on the support member 15 via the wire member 63 of the locking means 16, preventing the ceiling surface material 6 from falling.

[0047] In addition, in the ceiling fall prevention structure 9, the joint fittings 11 and the horizontal rod mounting fittings 14 swing in response to shaking caused by earthquakes, etc., thereby extremely reducing the bending stress applied to the hanging material 12 and preventing breakage or deformation of the hanging material 12.

[0048] Furthermore, this embodiment is a ceiling fall prevention structure 9 that prevents the suspended ceiling structure 1 from falling due to damage to the suspension structure of the suspended ceiling structure 1, and comprises a plurality of suspension materials 12 suspended from the structure's main body 17, support members 15 installed on the plurality of suspension materials 12 so as to be close to the ceiling base material 5 of the suspended ceiling structure 1, and locking means 16 attached to the support members 15 and the suspended ceiling structure 1, and when the suspended ceiling structure 1 has fallen a predetermined amount, the locking means 16 is supported by the support members 15.

[0049] In this case, in the attic space where space is occupied by various equipment and piping such as air conditioning equipment, audio equipment, fire extinguishing equipment, etc., and the installation space and working space for constructing the ceiling fall prevention structure 9 are limited, by positioning the support member 15 close to the joist 5, avoiding the various equipment and piping such as air conditioning equipment, audio equipment, fire extinguishing equipment, etc., it is possible to secure installation space and working space, and to provide a ceiling fall prevention structure 9 that is easy to construct.

[0050] Furthermore, in this embodiment, a joint fitting 11 is provided as an upper mounting fitting that holds multiple hanging materials 12 to the H-shaped steel 17 so that they can swing freely. As a result, the joint fitting 11 swings in response to shaking caused by an earthquake or the like, which greatly reduces the bending stress applied to the hanging materials 12, thereby preventing breakage or deformation of the hanging materials 12.

[0051] Furthermore, in this embodiment, the support member mounting brackets 14 are provided to hold the multiple hanging materials 12 on the support member 15 so that they can swing freely. As a result, the support member mounting brackets 14 swing in response to shaking caused by earthquakes, etc., and the bending stress acting on the hanging materials 12 is greatly reduced, thereby preventing breakage or deformation of the hanging materials 12.

[0052] In addition, in this embodiment, the locking means 16 is a wire member 63 that connects the support member 15 and the rafters 5, which serve as the ceiling underlayment material of the ceiling structure 1, thereby making it possible to take advantage of the flexibility of the wire member 63 to improve the freedom and workability of the connecting structure between the support member 15 and the rafters 5.

[0053] Furthermore, in this embodiment, as shown in Figures 9 to 12, the support member 15 can be positioned regardless of the orientation of the joist 5, thereby providing a highly versatile ceiling fall prevention structure 9 that is not limited by the installation orientation of the ceiling underlayment material. Example 2

[0054] 14 and 15 show a second embodiment of the present invention, in which the same parts as those in the first embodiment are given the same reference numerals and detailed descriptions thereof are omitted. The ceiling structure 70 in this example has a staircase-like step consisting of a high surface portion 71 and a low surface portion 72, and the construction of a ceiling fall prevention structure 9 for this ceiling structure 70 will be described below.

[0055] The hanging member 12A hanging from the higher surface portion 71 is formed longer than the hanging member 12B hanging from the lower surface portion 72, and the support member 15 installed between the hanging member 12A and the hanging member 12B is installed horizontally.

[0056] In this embodiment, even in the attic structure 70 having a stepped step, the support member 15 is positioned close to the joist 5, so that even in the low-level surface portion 72, a large working space can be secured above the support member 15. Example 3

[0057] 16 and 17 show a third embodiment of the present invention, in which the same parts as those in the first embodiment are assigned the same reference numerals and detailed descriptions thereof will be omitted. A ceiling structure 80 in this example is provided with a horizontal section 81 in which the ceiling surface material 6 is arranged horizontally, and an inclined section 82 in which the ceiling surface material 6 is arranged at an angle. The installation of a ceiling fall prevention structure 9 on this ceiling structure 80 will be described below.

[0058] In the inclined portion 82, the hanger 7 is bent to accommodate ceiling surface materials 6 that are not horizontal, but in the ceiling fall prevention structure 9, the support member 15 can be positioned along the inclined ceiling surface material 6, making the ceiling fall prevention structure 9 highly versatile and able to accommodate ceiling surface materials 6 with various inclination angles other than horizontal ceiling surface materials 6.

[0059] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the present invention. The ceiling underlayment is not limited to joist supports and joists, and may be any member that holds the ceiling surface material from above the ceiling, such as the inverted T-shaped T-bars used in system ceilings. The locking means may also be a means for connecting the support member and the ceiling surface material. [Explanation of symbols]

[0060] 1 Ceiling structure (suspended ceiling structure) 5. Ceiling underlayment 9 Ceiling fall prevention structure 11 Upper mounting bracket 12 Hanging material 14 Support member mounting bracket 15 Support member 16 Locking means 17 H type steel (framework) 39 Metal fittings body 63 Wire material

Claims

1. A ceiling fall prevention structure that prevents a suspended ceiling structure from falling, The suspended ceiling structure comprises: A suspension bolt suspended from the structure's frame; A sill support supported by the hanging bolt; A joist supported by the joist support; A ceiling surface material supported by the rough joist; Equipped with The ceiling fall prevention structure is A plurality of hanging members that are hung from the skeleton of the structure; A support member installed on the plurality of hanging members so as to be adjacent to the rough frame; locking means attached to said support member and said suspended ceiling structure; Equipped with A ceiling fall prevention structure characterized in that the locking means is supported by the support member when the suspended ceiling structure is lowered by a predetermined amount.

2. 2. The ceiling fall prevention structure according to claim 1, further comprising an upper mounting bracket for holding the hanging material so that it can swing freely.

3. 2. The ceiling fall prevention structure according to claim 1, further comprising a support member mounting bracket for holding the support member on the hanging member so that the support member can swing freely.

4. 2. The ceiling fall prevention structure according to claim 1, wherein the locking means is a wire member connecting the support member and the joist of the suspended ceiling structure.

5. The support member mounting bracket has a bracket body with openings on both sides, 4. The ceiling fall prevention structure according to claim 3, wherein the support member is inserted into and held by the metal fitting body.

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