Ceiling-space work supporting apparatus and ceiling-space work supporting method

Abstract

To provide a technology capable of performing support for securing safety of ceiling space work of a suspended ceiling structure from an indoor side.SOLUTION: An attic work support device supports work in an attic of a suspended ceiling structure having a plurality of ceiling joist receivers installed at an upper structure of a building skeleton via a plurality of suspension members at intervals, a plurality of ceiling joists fixed to the plurality of ceiling joist receivers, and a ceiling board attached to lower surfaces of the plurality of ceiling joists. Typically, the ceiling-interior work support device includes a lift device configured to be capable of self-standing on a floor surface and including an expansion / contraction mechanism that expands and contracts a support to a height of a ceiling board, and a top plate portion provided at a distal end portion of the support so that an upper surface faces the ceiling board. The top plate part includes a pair of square timber parts installed on the upper surface at an interval from each other, and the pair of square timber parts are configured to have a length longer than an installation interval of the plurality of ceiling joist receivers.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to a ceiling work support technology suitable for confirming the safety of ceiling work in a suspended ceiling structure. [Background technology]

[0002] Patent Document 1 discloses a floorboard for work inside the ceiling that can be used as a scaffold inside a ceiling where there are hanging bolts or obstacles. This floorboard for work inside the ceiling is brought into the ceiling, and the arms at both ends of the length are placed across a pair of parallel joist supports in a direction that crosses the joist supports, thereby forming a temporary scaffold inside the ceiling. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-209830 Summary of the Invention [Problem to be solved by the invention]

[0004] Air conditioning piping and other work may be performed above a suspended ceiling. If an inspection corridor is located above the ceiling, workers may access the work site through an inspection hatch in the ceiling board. In this case, it is necessary to confirm the safety of the access route and secure the access route while making repairs, etc., as necessary. The technology for the ceiling-mounted work floorboards described in Patent Document 1 has the problem that the ceiling-mounted work floorboards must be brought into the ceiling space through a narrow inspection hatch, which places a heavy burden on workers. Furthermore, depending on the ceiling structure, there may be restrictions on where the ceiling-mounted work floorboards can be installed. Thus, there are limitations to providing support for work above a suspended ceiling, and it is desirable to establish technology that provides support from inside the room to ensure safety during work.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide technology that can provide assistance from inside the room to ensure the safety of work above the ceiling in a suspended ceiling structure. [Means for solving the problem]

[0006] The attic work support device disclosed herein is an attic work support device that supports work above the ceiling of a suspended ceiling structure having a plurality of rafter supports installed at intervals from each other on the upper structure of a building body via a plurality of hanging members, a plurality of rafters fixed to the plurality of rafter supports, and ceiling boards attached to the underside of the plurality of rafters, and is equipped with a lift device that has an extension mechanism that is configured to be able to stand on the floor surface and that extends and retracts a support pole to the height of the ceiling board, and a top plate portion that is provided at the tip of the support pole so that its upper surface faces the ceiling board, and the top plate portion has a pair of square timber portions installed on its upper surface at a distance from each other, and the length of the pair of square timber portions is longer than the installation spacing of the plurality of rafter supports.

[0007] In addition, the ceiling work support method disclosed herein is a ceiling work support method that uses the above-mentioned ceiling work support device to support work by workers in the ceiling, and includes an arrangement process of arranging a lift device in a position that, in a vertical projection view, overlaps with the work area along the movement path from the inspection hatch in the ceiling board to the work site in the ceiling, and a support process of supporting the suspended ceiling structure by raising the top plate portion of the lift device to a height where a pair of square timber portions come into contact with the ceiling board, and the support process supports the suspended ceiling structure so that, in a vertical projection view, each of the pair of square timber portions overlaps with at least two of the multiple square timber supports. [Effects of the Invention]

[0008] According to the technology disclosed herein, the lift device of the ceiling work support device can support the space between the two joist supports by sandwiching the ceiling boards from the indoor side, thereby ensuring the safety of ceiling work in a suspended ceiling structure from the indoor side. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram showing an outline of a suspended ceiling structure to which an above-the-ceiling work support device according to an embodiment of the present invention is applied. [Figure 2] 2 is a schematic diagram of a portion of the suspended ceiling structure shown in FIG. 1, viewed from the +Y direction in the figure. [Figure 3] This is a schematic diagram of the attic space including the work site viewed from above. [Figure 4] FIG. 2 is a front view of the attic work support device. [Figure 5] FIG. 10 is a three-view diagram showing a top plate portion to which a pair of square members are fixed. [Figure 6] 1 is a vertical projection diagram showing a schematic example of the placement of an overhead work support device relative to a suspended ceiling structure. FIG. [Figure 7] 10A and 10B are diagrams for explaining the placement process in the support method using the attic work support device. [Figure 8] 10A and 10B are diagrams for explaining the support process in the support method using the attic work support device. [Figure 9] FIG. 10 is a diagram showing an example of installation of an intrusion prevention fence. [Figure 10] 10A and 10B are diagrams showing other examples of installation of intrusion prevention fences. [Figure 11] 10A and 10B are diagrams illustrating an example of installation of a magnet member on a top plate portion. [Figure 12] FIG. 1 is a diagram showing an example of an attic work support device equipped with multiple lift devices. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment will be described with reference to the drawings. Note that elements common to the various drawings are given the same reference numerals and redundant explanations will be omitted.

[0011] Embodiment 1. Outline of the lightweight steel ceiling structure FIG. 1 is a diagram showing an outline of a suspended ceiling structure to which an attic work support device according to an embodiment of the present invention is applied. This suspended ceiling structure 100 is, for example, a lightweight steel-framed ceiling structure in a steel-framed or reinforced concrete building. Note that FIG. 1 shows an excerpt of a portion of the suspended ceiling structure 100 as seen from inside the room. FIG. 2 is a schematic diagram of a portion of the suspended ceiling structure shown in FIG. 1 as seen from the +Y direction in the drawing. The suspended ceiling structure 100 mainly comprises hanging bolts 8, hangers 10, joist supports 12, joists 14, and ceiling boards 16.

[0012] The suspension bolts 8 are suspended from an upper slab H, which is the superstructure of the building skeleton. The suspension bolts 8 are attached to, for example, inserts provided in the upper slab H. In the example shown in FIG. 1, six suspension bolts 8 are shown.

[0013] A hanger 10 is attached to the lower end of each hanging bolt 8. The hangers 10 support the joist support 12. In other words, the hanging bolts 8 and the hangers 10 function as hanging members for suspending the joist support 12 from the upper slab H.

[0014] The siding support 12 is used to support the siding 14. A plurality of siding supporters 12 are installed parallel to each other at a predetermined interval D1. The installation interval D1 here is, for example, 900 mm. Figure 1 shows three siding supporters 12.

[0015] The rafters 14 are used to support the ceiling boards 16. A plurality of rafters 14 are attached to the rafter support 12 using clips (not shown). The rafters 14 are installed parallel to each other at intervals, in a direction perpendicular to the longitudinal direction of the rafter support 12. Five rafters 14 are shown in FIG. 1.

[0016] The ceiling boards 16 form the ceiling surface of the indoor space. The ceiling boards 16 are, for example, gypsum boards. The ceiling boards 16 are attached to the undersides of the multiple joists 14 so as to cover the entire suspended ceiling structure 100. In Figure 1, a portion of the ceiling boards 16 attached to the suspended ceiling structure 100 is shown by a dotted line. In the following description, the upper space separated by the ceiling boards 16 will be referred to as "attic space A1," and the lower space will be referred to as "indoor space A2." An inspection hatch 18 is formed in the ceiling boards 16. The inspection hatch 18 is a rectangular opening that allows workers to enter the attic space A1 from the indoor space A2. The inspection hatch 18 is normally closed and is opened by workers during inspection.

[0017] 2. Features of the ceiling work support device according to the embodiment When installing, replacing, or repairing air conditioning equipment, work such as piping may be required in the work site in the attic space A1. In this case, workers must open an inspection hatch 18, enter the attic space A1 from the indoor space A2, and move through the attic space A1 to the work site. Figure 3 is a schematic diagram of the attic space, including the work site, viewed from above. As in the attic space A1 shown in this figure, there may be a permanent inspection corridor 20 for workers to move through. At such sites, workers use the inspection corridor 20 and also use the relatively strong joist support 12 as scaffolding to move to the work site.

[0018] At some worksites, the support hardware suspending the inspection walkway 20 in the attic space A1 may fall off, leaving a safe route to the work site unsecured. In such cases, additional work, such as inspecting and repairing the route to the work site, is required before actual work, such as piping installation, can begin. However, the suspended ceiling structure 100 has many areas that are not strong enough for people to stand on, which can make work in the attic space A1 difficult. Furthermore, the inspection hatch 18 through which workers can enter is relatively small, and the types of auxiliary tools that can be brought into the attic space A1 are limited.

[0019] Therefore, the inventor of the present application has devised a ceiling work support device for supporting the suspended ceiling structure 100 from the side of the large indoor space A2. Figure 4 is a front view of the ceiling work support device. The ceiling work support device 30 is installed on the floor surface F of the indoor space A2 and used. The ceiling work support device 30 is equipped with a lift device 32.

[0020] The lift device 32 comprises a support column 34 and a top panel 36. The support column 34 has a base 34a and a telescopic mechanism 34b fixed to the base 34a, which can freely extend and retract. The base 34a fixes the telescopic mechanism 34b to the floor F so that it can stand upright in the vertical direction. The base 34a is equipped with wheels so that it can move along the floor F. The telescopic mechanism 34b is a support column configured to be telescopic to the height of the ceiling board 16 when the lift device 32 is installed in the indoor space A2. The telescopic mechanism 34b extends and retracts the support column using an actuator. The actuator can be powered by known technology such as air pressure, hydraulics, or electricity.

[0021] The top plate portion 36 is a rectangular plate material, and is fixed to the tip of the extension mechanism 34b of the support portion 34 so that its upper surface faces the ceiling board 16. The long side dimension of the top plate portion 36 is shorter than the dimension of the installation interval of the joist supports 12. As the support portion 34 extends and contracts in the vertical direction, the top plate portion 36 is raised to a height where it comes into contact with the ceiling board 16. (A) in Figure 4 shows the attic work support device 30 when the support portion 34 is in a contracted state, and (B) in Figure 4 shows the attic work support device 30 when the support portion 34 is in an extended state.

[0022] A pair of square timber sections 40 are fixed to the upper surface of the top plate section 36. Figure 5 is a three-view diagram showing the top plate section to which the pair of square timber sections are fixed. The pair of square timber sections 40 are square timbers that are longer than the long side dimension of the top plate section 36. The pair of square timber sections 40 are fixed parallel to the edge of the long side of the top plate section 36. The longitudinal dimension D2 of the pair of square timber sections 40 is longer than the installation distance D1 of the joist support 12, and is, for example, 1500 mm. The pair of square timber sections 40 are made of wood, for example, and are detachably fastened to the top plate section 36 with screws.

[0023] The ceiling-space work support device 30 is used by extending the support members 34 from the indoor space A2, raising the top panel 36, and bringing the pair of square members 40 into contact with the ceiling boards 16. FIG. 6 is a vertical projection diagram schematically illustrating an example of the placement of the ceiling-space work support device relative to a suspended ceiling structure. As described above, the longitudinal dimension D2 of the pair of square members 40 is greater than the installation interval D1 of the joist supports 12. Therefore, as shown in this figure, the ceiling-space work support device 30 can be placed in a position and orientation such that, in a vertical projection, each of the pair of square members 40 intersects with at least two joist supports 12 within the work area in the ceiling space A1. This allows the ceiling-space work support device 30 to support the suspended ceiling structure 100 from the indoor space A2 side within the intersection area between the pair of square members 40 and the joist supports 12 in a vertical projection. As a result, workers in the ceiling space A1 can safely inspect and repair the movement paths within the work area.

[0024] Furthermore, when the pair of square timber sections 40 come into contact with the ceiling board 16, a gap equal to the height of the pair of square timber sections 40 is formed between the upper surface of the top panel section 36 and the ceiling board 16. Therefore, even if the upper surface of the top panel section 36 faces a protrusion on the ceiling board 16, it is more likely that contact with the protrusion can be avoided.

[0025] 3. Work procedure using the ceiling work support device 30 Next, we will explain a series of support methods for ensuring the safety of movement routes in the attic space A1 using the attic work support device 30. This work is performed by at least two workers, including an attic worker working in the attic space A1 and an indoor worker providing support in the indoor space A2. First, as a preparation step, the attic worker opens the inspection hatch 18 and enters the attic space A1 from the indoor space A2. Then, the attic worker plans a movement route from the inspection hatch 18 to the work site. Below, we will explain the movement route using the inspection corridor 20 shown in Figure 3 as an example, but the movement route can be planned appropriately depending on the site.

[0026] 7 is a diagram illustrating the placement process in the support method using the ceiling work support device 30. In the placement process, under the direction of the ceiling worker, the indoor worker moves the lift device 32 to a position immediately below the work area in the ceiling A1. First, the lift device 32 is moved to a position immediately below the starting position of the movement path. The indoor worker then fine-tunes the position and orientation of the lift device 32 so that the pair of square beams 40 intersect with two adjacent joist supports 12 in a vertical projection view.

[0027] 8 is a diagram illustrating the support step in the support method using the ceiling work support device 30. In the support step, the indoor worker operates the extension / contraction mechanism 34b to raise the top panel 36 to a height where the pair of square beams 40 contact the ceiling board 16. In the support range supported by the ceiling work support device 30, the ceiling worker performs safety confirmation work, including inspecting and repairing the movement path.

[0028] Once the work by the ceiling worker is completed, the process moves on to the next step, the lowering step. In the lowering step, the indoor worker operates the extension mechanism 34b to lower the top panel 36 to a position where the pair of beams are separated from the ceiling board 16. Once the lowering step is completed, the placement, support, and lowering steps are performed again. In this placement step, the lift device 32 is moved to a position immediately below the next work area along the movement path. These placement, support, and lowering steps are repeated while the work area is moved stepwise along the movement path. According to the above-described work method, it is possible to sequentially inspect and repair the movement path from the inspection hatch 18 to the work site while ensuring safety.

[0029] 4. Modification of the ceiling work support device 30 The above-the-ceiling work support device 30 according to the embodiment may employ the following modified forms.

[0030] 4-1.Intrusion prevention fence The attic work support device 30 may further include an intrusion prevention fence 50. Figure 9 is a diagram showing an example of the installation of an intrusion prevention fence. Figure 9 shows the suspended ceiling structure 100 as a vertical projection from above. As shown in this figure, the intrusion prevention fence 50 is installed on the floor F of the indoor space A2 so as to surround an intrusion prevention area including the lift device 32 and the inspection hatch 18 as viewed in vertical projection. This process will be referred to as the "fence installation process" hereinafter. There are no particular limitations on the shape and structure of the intrusion prevention fence 50 as long as it is effective in preventing intrusion into the fence. Such an intrusion prevention fence 50 makes it possible to ensure the safety of work in the indoor space A2.

[0031] Furthermore, the intrusion prevention fence 50 may be installed with its intrusion prevention range gradually expanded to further surround the movement trajectory of the lift device 32. Fig. 10 is a diagram showing another example of the installation of an intrusion prevention fence. Directly above the movement trajectory of the lift device 32, there is a possibility that an attic worker may be performing some kind of work in the attic space A1. The intrusion prevention fence 50 shown in Fig. 10 can ensure safety in the unlikely event of an object falling from the attic space A1.

[0032] 4-2.Magnetic components In the supporting process, the ceiling worker is required to instruct the indoor worker on the position and orientation of the top panel portion 36 so that, in a vertical projection view, the pair of square timber portions 40 intersect with the two joist supports 12. However, the ceiling worker cannot accurately grasp the position and orientation of the lift device 32 from the ceiling space A1.

[0033] Therefore, the ceiling-space work support device 30 may include a magnet member 60 on the upper surface of the top panel 36. FIG. 11 illustrates an example of the magnet member installation on the top panel. As shown in this figure, the magnet member 60 is positioned, for example, near the center of the top surface of the top panel 36 within a height range that does not protrude beyond the pair of square bar members 40. With this configuration, when the top panel 36 approaches the ceiling board 16, the ceiling space worker can determine the position and orientation of the top panel 36 by applying a magnetic material to the ceiling board 16 from the ceiling space A1 to identify the magnetically attached position. This allows the ceiling space worker to visually confirm the position of the joist support 12 in the ceiling space A1 and indicate the position and orientation of the top panel 36. Note that the type, number, and arrangement of the magnet members 60 are not limited.

[0034] 4-3.Multiple lift devices Depending on the conditions of the indoor space A2, there may be an obstacle in the indoor space A2 directly below the work area. In such a case, it is not possible to position the lift device 32 directly below the work area. Therefore, the attic work support device 30 may be equipped with multiple lift devices 32. FIG. 12 is a diagram showing an example of an attic work support device equipped with multiple lift devices. The attic work support device 30 shown in this figure is equipped with two lift devices 32. A pair of beam members 40 are arranged as common members for the two lift devices 32, spanning the respective top panel members 36. A attic work support device 30 configured in this manner increases the degree of freedom in positioning the lift devices 32, making it possible to flexibly respond to the conditions of the indoor space A2.

[0035] 4-4. Top plate part 36 The top panel 36 may further include a rectangular plate placed on top of the pair of square bar sections 40. In this case, the longitudinal dimension of the plate is set to be equal to or greater than the longitudinal dimension of the pair of square bar sections 40. With this configuration, the lift device 32 can support the ceiling board 16 on the surface of the plate of the top panel 36, thereby avoiding stress concentration.

[0036] 5.Other Although the preferred embodiments have been described in detail above, the present disclosure is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0037] Various aspects of the present disclosure are summarized below as appendices.

[0038] (Appendix 1) A ceiling work support device that supports work above the ceiling of a suspended ceiling structure having a plurality of rafters installed at intervals on the upper structure of a building frame via a plurality of hanging members, a plurality of rafters fixed to the plurality of rafters, and a ceiling board attached to the underside of the plurality of rafters, a lift device including an extension mechanism configured to be able to stand on a floor surface and extending and retracting a support pole up to the height of the ceiling board, and a top plate portion provided at the tip of the support pole so that the top surface faces the ceiling board; The top plate portion includes a pair of square members disposed on the top surface with a gap between them, The length of the pair of square timber portions is longer than the installation interval of the plurality of joist supports. Attic work support device. (Appendix 2) a plurality of the lift devices; The pair of square members are installed so as to span between the plurality of lift devices. 10. The ceiling work support device according to claim 1. (Appendix 3) The ceiling board further includes a magnet member installed on the upper surface of the ceiling board. 10. The ceiling work support device according to claim 1 or 2. (Appendix 4) An attic work support device described in any one of Appendix 1 to Appendix 3, further comprising an intrusion prevention fence installed on the floor surface so as to surround an intrusion prevention range including the inspection hatch and the lift device in a vertical projection view. (Appendix 5) The intrusion prevention range further includes the range of the movement trajectory of the lift device in a vertical projection view. (Appendix 6) A ceiling work support method for supporting work by a worker in a ceiling space using the ceiling work support device according to any one of Supplementary Note 1 to Supplementary Note 3, an arrangement step of arranging the lift device at a position that overlaps with a work area along a movement path from an inspection hatch provided in the ceiling board to a work site above the ceiling in a vertical projection view; a supporting step of supporting the suspended ceiling structure by raising the top plate portion of the lift device to a height at which the pair of square members contact the ceiling board, The support process is an attic work support method that supports the suspended ceiling structure so that each of the pair of square timber portions overlaps with at least two of the multiple joist supports in a vertical projection view. (Appendix 7) The method further includes a lowering step of lowering the top plate portion of the lift device after the supporting step and the completion of the safety confirmation work in the work area. Attachment 6: A ceiling work support method. (Appendix 8) The placing step, the supporting step, and the lowering step are repeatedly performed while the working range is moved stepwise along the moving path. 8. The ceiling work support method according to claim 7, wherein the ceiling work support method is configured as follows. (Appendix 9) A ceiling work support method described in any one of Appendices 6 to 8, further comprising a fence installation process of installing an intrusion prevention fence on the floor surface so as to surround an intrusion prevention range including the inspection hatch and the lift device in a vertical projection view. (Appendix 10) the intrusion prevention range includes a range of a movement trajectory of the lift device, The fence installation step installs the intrusion prevention fence so as to expand the area enclosed by the intrusion prevention fence in accordance with the expansion of the intrusion prevention area. 10. The ceiling work support method according to claim 9, configured as follows: [Explanation of symbols]

[0039] 8 Hanging bolt, 10 Hanger, 14 Rough joist, 16 Ceiling board, 18 Inspection hatch, 20 Inspection walkway, 30 Ceiling work support device, 32 Lifting device, 34 Support section, 34a Base section, 34b Telescopic mechanism, 36 Top plate section, 40 Square timber section, 50 Intrusion prevention fence, 60 Magnetic member, 100 Suspended ceiling structure, A1 Ceiling space, A2 Interior space, F Floor, H Upper slab

Claims

1. A ceiling work support device that supports work above the ceiling of a suspended ceiling structure having a plurality of rafters installed at intervals on the upper structure of a building frame via a plurality of hanging members, a plurality of rafters fixed to the plurality of rafters, and a ceiling board attached to the underside of the plurality of rafters, a lift device including an extension mechanism configured to be able to stand on a floor surface and extending and retracting a support pole up to the height of the ceiling board, and a top plate portion provided at the tip of the support pole so that the top surface faces the ceiling board; The top plate portion includes a pair of square members disposed on the top surface with a gap between them, The length of the pair of square timber portions is longer than the installation interval of the plurality of joist supports. Attic work support device.

2. a plurality of the lift devices; The pair of square members are installed so as to span between the plurality of lift devices. The ceiling work support device according to claim 1.

3. The ceiling board further includes a magnet member installed on the upper surface of the ceiling board. The ceiling work support device according to claim 1 or 2.

4. 3. The attic work support device according to claim 1, further comprising an intrusion prevention fence installed on the floor surface so as to surround an intrusion prevention range including the inspection hatch and the lift device in a vertical projection view.

5. The above-ceiling work support device according to claim 4 , wherein the intrusion prevention range further includes a range of a movement trajectory of the lift device in a vertical projection view.

6. 2. A ceiling work support method for supporting work by a worker in the ceiling space using the ceiling work support device according to claim 1, comprising: an arrangement step of arranging the lift device at a position that overlaps with a work area along a movement path from an inspection hatch provided in the ceiling board to a work site above the ceiling in a vertical projection view; a supporting step of supporting the suspended ceiling structure by raising the top plate portion of the lift device to a height at which the pair of square members contact the ceiling board, The support process is a ceiling work support method that supports the suspended ceiling structure so that each of the pair of square timber portions overlaps with at least two of the multiple joist supports in a vertical projection view.

7. The method further includes a lowering step of lowering the top plate portion of the lift device after the supporting step and the completion of the safety confirmation work in the work area. The method for supporting work above the ceiling according to claim 6.

8. The placing step, the supporting step, and the lowering step are repeatedly performed while the working range is moved stepwise along the moving path. The method for supporting work above the ceiling according to claim 7, wherein the method is configured as follows.

9. The method for supporting work above the ceiling as described in claim 8, further comprising a fence installation process for installing an intrusion prevention fence on the floor surface so as to surround an intrusion prevention range including the inspection hatch and the lift device in a vertical projection view.

10. the intrusion prevention range includes a range of a movement trajectory of the lift device, The fence installation step installs the intrusion prevention fence so as to expand the area enclosed by the intrusion prevention fence in accordance with the expansion of the intrusion prevention area. The method for supporting work above the ceiling according to claim 9, wherein the method is configured as follows.

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