JP6541167B1 - Ceiling board support device and ceiling board removal method using the same - Google Patents

Abstract

The present invention provides a ceiling plate support device capable of improving the efficiency of a ceiling board removal operation, reducing noise when removing the ceiling board, and enabling a worker to work safely. A ceiling board supporting device (1) is used when removing a ceiling board (8) fixed to a field edge (9) from the field edge (9), and comprises a pair of main surfaces (81, 81) and a pair of main surfaces (81). , 81, and the main body 2 for supporting the main surface 81 at a predetermined angle with respect to the vertical direction. And a second support 4 extending upward from the first support 3 to support the end face 82. [Selected figure] Figure 2

Description

  The present invention relates to a ceiling plate support device used when removing a ceiling plate fixed to a field edge from the field edge and a ceiling plate removal method using the same.

  Conventionally, when removing an existing ceiling by peeling off a ceiling board such as a gypsum board fixed to a field edge, an operator on the floor uses a bar-shaped tool provided with hook-like brackets at its tip, Hook the bracket on the ceiling plate and drop the ceiling plate on the floor. For this reason, the ceiling board which fell on the floor will be damaged, and there is a problem that the noise at the time of removing a ceiling board is large. In addition, the ceiling plate is scattered on the floor, and it is necessary to recover the dropped waste material, and there is a problem that the efficiency of removing the ceiling plate is low. In addition, there is a risk that the ceiling plate may fall above the worker's head or the like, and fragments of the dropped ceiling plate may scatter to the worker, so that the worker can not work safely.

  As a technique for disassembling a ceiling, a ceiling structure disassembly device of Patent Document 1 is disclosed. The ceiling structure disassembling apparatus of Patent Document 1 is an apparatus for disassembling a ceiling structure by peeling a board laid on a ceiling, and a frame member constituting a framework of the apparatus and a tip of the frame member sway in the vertical direction It is provided in a movable mode, and provided in a mode in which a tip portion swings by applying an operating force to peel off the board, and a mode in which the tip is locked to the frame member via a locking member. And a net for preventing scattering of fragments of the board peeled off by the peeling section.

JP 2008-240444 A

  However, the ceiling structure disassembling apparatus of Patent Document 1 strikes and breaks the surface of the board laid on the ceiling, and collects the shredded boards in the collecting carriage. There is a problem that the noise at the time of removal is large because the board laid on the ceiling is broken when the board is peeled off. The shattered boards will be randomly collected by the collection cart, and the collection cart will soon be full of board waste. There existed a problem that the efficiency of the removal operation of the ceiling board could not be improved by this. In addition, in the ceiling structure disassembling apparatus of Patent Document 1, although a net is provided at a location through which the crushed board passes, the fragments of the board are scattered to the outside of the net because the board is crushed and the worker There is a risk that debris may fall overhead, and the worker can not work safely.

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the purpose of the present invention is to improve the efficiency of the work of removing the ceiling plate and reduce the noise when removing the ceiling plate. It is possible to provide a ceiling board support device which enables a worker to work safely and a ceiling board removal method using the same.

  A ceiling plate support device according to a first aspect of the present invention is a ceiling plate support device used when removing a ceiling plate fixed to a field edge from the field edge, and connecting a pair of main surfaces and a pair of main surfaces A main body portion for supporting the ceiling plate having an end face formed thereon, the main body portion extending at a predetermined angle with respect to the vertical direction, and supporting a main surface by supporting the main surface And a second support portion extending upward from the first support portion to support the end surface.

  According to a second aspect of the present invention, in the ceiling plate support device of the first aspect, the first support portion is provided with a first buffer portion made of a buffer material at an upper portion.

  The ceiling plate support device according to the third invention is characterized in that, in the first invention or the second invention, the second support portion is provided with a second buffer portion made of a shock absorbing material at a position facing the first support portion. I assume.

  The ceiling plate support device according to a fourth aspect of the present invention is the ceiling plate support device according to any one of the first to third aspects, wherein the first support portion is a first slope portion provided with the second support portion and the first slope portion. And a second inclined portion attached for translational movement.

  According to a fifth aspect of the present invention, there is provided a ceiling plate support apparatus according to any one of the first to fourth aspects of the present invention, further comprising: a wheel for moving the main body; and a stopper for controlling movement by the wheel. It is characterized by

  According to a sixth aspect of the present invention, there is provided a ceiling plate support apparatus according to any one of the first to fifth aspects of the present invention, further comprising: a connecting mechanism connecting the plurality of main body portions to each other.

  A ceiling board removing method according to a seventh invention is a ceiling board removing method for removing a ceiling board fixed to a field edge, using the ceiling board supporting device according to any one of the first to sixth inventions. Removing the ceiling plate on which the pair of main surfaces and the end surfaces connecting the pair of main surfaces are formed, and in the removing step, the step of peeling off the ceiling plate from the field edge and And a supporting step of causing the first support portion to support the main surface of the ceiling plate that has been peeled off, and supporting the end surface of the ceiling plate to the second support portion. How to remove.

  A ceiling board removal method according to an eighth aspect of the present invention is a ceiling board removal method for removing a ceiling board fixed to a field edge, comprising: a rod-like member extending in a first direction; and one end side of the rod-like member A claw extending in a second direction orthogonal to the first direction, and between the other end of the rod-like member and the claw and extending in a third direction orthogonal to the first direction and the second direction An end face connecting a pair of main surfaces and a pair of main surfaces using a ceiling plate removing tool having a fulcrum portion and the ceiling plate support device according to any one of the first to sixth inventions; And removing the ceiling plate on which the claws are formed, wherein the removal step arranges the claw portion on the main surface on the upper side of the ceiling plate and arranges the fulcrum portion on the lower surface side of the field edge. Placing the rod-like member so that the fulcrum is the rotation axis, and And allowing the first support portion to support the main surface of the removed ceiling plate by the first support portion, and a second support portion for the end surface of the ceiling plate. And a supporting step of supporting.

  According to the first to eighth inventions, the main surface of the ceiling plate peeled off from the edge is supported by the first support portion, and the ceiling plate slides the inclined first support portion to support the second end surface Can be supported by the department. Thereby, it is possible to remove the ceiling plate peeled off from the edge without dropping it on the floor surface. For this reason, it becomes possible to reduce the noise at the time of removing a ceiling board.

  Further, according to the first to eighth inventions, it is possible to prevent the worker from performing the work directly below the ceiling plate, and it is possible that the peeled ceiling plate falls onto the worker's head. It can be suppressed. Therefore, the worker can work safely.

  Further, according to the first to eighth inventions, it is possible to stack and collect the ceiling plates peeled off from the edge of the field. For this reason, it becomes possible to improve the efficiency of the work of removing the ceiling plate.

  In particular, according to the second aspect of the present invention, the first buffer can absorb the impact force generated when the ceiling plate pulled off from the edge of the field drops and the main surface is supported by the first support portion. For this reason, it becomes possible to prevent that the torn-off ceiling board is damaged. In addition, it is possible to further reduce the noise when removing the ceiling plate.

  In particular, according to the third invention, it is possible to absorb the impact force generated when the ceiling plate slides the first support portion and causes the second support portion to support the end face by the second buffer portion. For this reason, it becomes possible to prevent that the torn-off ceiling board is damaged. In addition, it is possible to further reduce the noise when removing the ceiling plate.

  In particular, according to the fourth invention, the height of the first support portion can be adjusted. For this reason, it becomes possible to perform the removal operation of a ceiling board more efficiently by adjusting the height of the optimal 1st support part according to the attachment height of a ceiling board.

  In particular, according to the fifth aspect of the present invention, the ceiling plate support device can be moved according to the mounting position of the ceiling plate to be removed. Moreover, when supporting the stripped ceiling board, it can prevent that a main-body part moves. For this reason, it becomes possible to perform the removal operation of a ceiling board more efficiently.

  In particular, according to the sixth invention, the width of the ceiling plate which can be supported by the main body can be increased. For this reason, it becomes possible to improve the efficiency of the work of removing the ceiling plate.

  In particular, according to the eighth invention, it is possible to prevent the ceiling plate from being broken when it is peeled off from the edge of the field. In addition, the ceiling plate can be removed without using a stepladder or the like. Therefore, the worker can work safely.

FIG. 1: is a perspective view which shows an example of the ceiling board support apparatus in embodiment. Drawing 2 is a side view showing an example of a ceiling board support device in an embodiment. Drawing 3 is a sectional view showing an example of the 1st supporter in an embodiment. FIG. 4 is a side view showing an example of the stopper in the embodiment. FIG. 5: is a perspective view which shows an example of the ceiling board removal tool used by the ceiling board removal method in embodiment. FIG. 6 is a figure for demonstrating the arrangement | positioning process and the peeling process of the ceiling-plate removal method in embodiment. Drawing 7 is a figure for explaining the support process of the ceiling board removal method in an embodiment. FIG. 8 is a side view showing a modified example of the main body in the embodiment. FIG. 9 is a front view showing an example of the connection mechanism in the embodiment.

  Hereinafter, a ceiling board support device to which the present invention is applied and a mode for carrying out a ceiling board removal method will be described in detail with reference to the drawings.

  Drawing 1 is a perspective view showing an example of ceiling board support device 1 in an embodiment. Drawing 2 is a side view showing an example of ceiling board support device 1 in an embodiment.

  The ceiling plate support device 1 is used when removing the ceiling plate 8 fixed to the field edge 9 from the field edge 9. The ceiling plate 8 is a substantially rectangular parallelepiped ceiling plate such as a gypsum board, and is a pair of main surfaces 81 (upper main surface 81a, lower main surface 81b) and four end surfaces connecting the main surfaces 81 with each other. 82 are formed. The ceiling plate 8 is fixed to the rim 9 so that the lower main surface 81 b faces the floor surface 99.

  The ceiling board support device 1 includes a main body 2 for supporting the ceiling board 8. The ceiling plate support device 1 may further include four wheels 5 for moving the main body 2 and a stopper 6 for controlling movement by the wheels 5.

  The main body portion 2 has a first support portion 3 and a second support portion 4. The main body portion 2 further includes a vertically extending post portion 28 for fixing the first support portion 3 and a handrail 29 which an operator can grip.

  The first support portion 3 is for extending at a predetermined angle with respect to the vertical direction and supporting the main surface 81 of the ceiling plate 8. For the first support portion 3, a frame material made of metal or the like is used.

  The first support portion 3 is provided with a non-slip portion 38 made of resin on the top surface. The non-slip portion 38 can prevent the ceiling plate 8 supported by the first support portion 3 from sliding off the first support portion 3.

  The first support portion 3 has a first inclined portion 31 in which the second support portion 4 is provided, and a second inclined portion 34 attached so as to move in parallel to the first inclined portion 31.

  The first inclined portion 31 connects the pair of first inclined frame members 32, 32 extending in parallel with each other by extending at a predetermined angle with respect to the vertical direction, and the pair of first inclined frame members 32, 32. And a first connecting frame member 33. The first inclined portion 31 has a rectangular outer shape formed by the pair of first inclined frame members 32 and 32 and the first connection frame member 33.

  The second inclined portion 34 connects a pair of second inclined frame members 35, 35 extending in a direction inclined by a predetermined angle with respect to the vertical direction so as to be parallel to each other, and a pair of second inclined frame members 35, 35 And a second connecting frame member 36. The second inclined portion 34 has a rectangular outer shape formed by the pair of second inclined frame members 35 and 35 and the second connection frame member 36.

  Drawing 3 is a sectional view showing an example of the 1st supporter 3 in an embodiment. The first inclined frame member 32 is formed with a groove 32a extending along its longitudinal direction. In a groove 32 a formed in the first inclined frame member 32, an attachment member 37 a such as a bolt and a nut attached to the second connection frame member 36 is attached. The attaching member 37a is attached to the L-shaped connecting member 37b, and the connecting member 37b and the second connecting frame member 36 are attached by the attaching member 37c. Thus, the first inclined portion 31 and the second inclined portion 34 are attached. By loosening the attachment member 37a, the attachment member 37a can be slid along the groove 32a in the direction of the arrow S in the figure. Thereby, the second inclined portion 34 moves in parallel with the first inclined portion 31.

  The second support portion 4 is for extending upward from the first support portion 3 to support the end surface 82 of the ceiling plate 8. The second support portion 4 uses a frame material such as metal. The second support 4 is provided perpendicularly to the first support 3. One end of the second support 4 is attached to the first connection frame member 33 of the first support 3, and the other end is attached to the handrail 29.

  FIG. 4 is a side view showing an example of the stopper 6 in the embodiment. The stopper 6 has a contact portion 61 capable of coming into contact with the floor surface, and a switching portion 62 for switching between a state in which the contact portion 61 contacts the floor surface and a state in which the contact portion 61 is separated. As shown in FIG. 4A, the stopper 6 can stop the movement of the wheel 5 when the contact portion 61 is in contact with the floor surface. The stopper 6 can move by the wheel 5 in a state where the contact portion 61 is separated from the floor surface as shown in FIG. 4 (b). Thus, the stopper 6 controls the movement by the wheel 5.

  Next, a ceiling board removal method to which the present invention is applied will be described.

  The ceiling board removal method according to the embodiment is a ceiling board removal method for removing the ceiling board 8 fixed to the field edge 9. The ceiling board support apparatus 1 and the ceiling board removal tool 100 are used for the ceiling board removal method which concerns on embodiment.

  FIG. 5: is a perspective view which shows an example of the ceiling board removal tool 100 used by the ceiling board removal method in embodiment. The ceiling plate removing tool 100 is, for example, made of metal. The ceiling plate removing tool 100 includes a rod-like member 101 extending in the first direction X, a claw portion 102 extending in the second direction Y orthogonal to the first direction X from one end 101 a of the rod-like member 101, and the rod-like member 101. And two fulcrum portions 103 provided between the other end portion 101b of the first and the claws 102 and extending in a third direction Z orthogonal to the first direction X and the second direction Y. The fulcrum portions 103 are provided on both sides of the rod-like member 101.

  The ceiling plate removal method according to the embodiment includes a removal step of removing the ceiling plate 8 on which the pair of main surfaces 81, 81 and the end surface 82 connecting the pair of main surfaces 81, 81 are formed.

  In the removal step, first, the ceiling plate support device 1 is disposed directly below the ceiling plate 8 to be peeled off from the edge 9. And the contact part 61 in the stopper 6 of the ceiling board support apparatus 1 is made to contact the floor surface, and the movement by the wheel 5 is stopped.

  The removal process includes a placement process, a peeling process, and a support process. FIG. 6 is a figure for demonstrating the arrangement | positioning process and the peeling process of the ceiling-plate removal method in embodiment.

  In the disposing step, the claw portion 102 is disposed on the upper main surface 81 of the ceiling plate 8, and the fulcrum portion 103 is disposed on the lower surface side of the field edge 9.

  Next, in the peeling process, the rod-like member 101 is rotated in the direction of arrow P in the drawing so that the fulcrum portion 103 becomes a rotation axis, and the ceiling plate 8 is peeled off from the field edge 9 by the claw portion 102.

  Drawing 7 is a figure for explaining the support process of the ceiling board removal method in an embodiment. Next, in the supporting step, the main surface 81 of the ceiling plate 8 peeled off in the direction of arrow P in the drawing is supported by the first support portion 3 and the end surface 82 of the ceiling plate 8 is supported by the second support portion 4. In detail, in the supporting step, the main surface 81 of the ceiling plate 8 peeled off from the edge 9 is supported by the first support portion 3 and the ceiling plate 8 slides the inclined first support portion 3 so that the end surface 82 Is supported by the second support 4.

  Next, the switching unit 62 switches the state in which the contact portion 61 is in contact with the floor surface 99 to a state in which the contact portion 61 is separated. As a result, the main body 2 is moved by the wheels 5, and then the ceiling plate supporting device 1 is disposed just below the ceiling plate 8 to be peeled off from the edge 9. And the contact part 61 in the stopper 6 of the ceiling board support apparatus 1 is switched to the state made to contact the floor surface 99, and the movement by the wheel 5 is stopped. After that, the removal process is performed.

  Repeating these, the peeled ceiling boards 8 are sequentially stacked and collected on the ceiling board supporting device 1. And the ceiling board removal method concerning this embodiment is completed.

  According to the present embodiment, the main body portion 2 extends upward from the first support portion 3 and the first support portion 3 for supporting the main surface 81 by extending at a predetermined angle with respect to the vertical direction. And a second support 4 for supporting the end face 82. Thus, the main surface 81 of the ceiling plate 8 peeled off from the edge 9 is supported by the first support portion 3 and the ceiling plate 8 slides the inclined first support portion 3 to make the end surface 82 a second support portion 4 can be supported. For this reason, it is possible to remove the ceiling plate 8 peeled off from the edge 9 without dropping it on the floor surface 99. Therefore, damage to the ceiling plate 8 due to the ceiling plate 8 falling to the floor surface 99 can be prevented, and noise when removing the ceiling plate 8 can be reduced.

  Further, according to the present embodiment, it is possible to prevent the worker from performing work directly below the ceiling plate 8, and it is possible to suppress the dropped ceiling plate 8 from falling onto the worker's head. . Therefore, the worker can work safely.

  Moreover, according to this embodiment, it is possible to stack and collect the ceiling plate 8 peeled off from the field edge 9. For this reason, it is possible to improve the efficiency of the removal operation of the ceiling plate 8.

  According to the present embodiment, the first support portion 3 is provided with the first inclined portion 31 provided with the second support portion 4 and the second inclined portion 34 attached so as to move in parallel with respect to the first inclined portion 31 Have. Thereby, the height of the 1st support part 3 can be adjusted. For this reason, it becomes possible to perform the removal operation of the ceiling board 8 more efficiently by adjusting the height of the optimal 1st support part 3 according to the attachment height of the ceiling board 8. FIG.

  According to the present embodiment, the wheel 5 for moving the main body 2 and the stopper 6 for controlling the movement of the wheel 5 are further provided. Thereby, according to the attachment place of the ceiling board 8 to remove, the ceiling board support apparatus 1 can be moved. Moreover, when supporting the peeled ceiling board 8, it can prevent that the main-body part 2 moves. For this reason, it becomes possible to perform the removal work of the ceiling board 8 more efficiently.

  According to the present embodiment, the peeling process of peeling the ceiling plate 8 from the edge 9 and the main surface 81 of the peeled ceiling plate 8 are supported by the first support portion 3 and the end surface 82 of the ceiling plate 8 is And a supporting step of supporting the second supporting portion 4. Accordingly, it is possible to prevent the worker from performing work directly below the ceiling plate 8 and to suppress the dropped ceiling plate 8 from falling on the worker's head. Therefore, the worker can work safely.

  According to the present embodiment, when the ceiling plate 8 is removed, the rod-shaped member 101 extending in the first direction X and the second direction Y orthogonal to the first direction X from one end 101 a side of the rod-shaped member 101 It has a claw portion 102 which extends, and a fulcrum portion 103 which is provided between the other end portion 101 b of the rod-like member 101 and the claw portion 102 and which extends in a third direction Z orthogonal to the first direction X and the second direction Y. Use a ceiling material removal tool further. Thereby, when it tears off from the field edge 9, it can prevent that the ceiling board 8 is damaged. Moreover, the ceiling plate 8 can be removed without using a stepladder or the like. Therefore, the worker can work safely.

  According to the present embodiment, the ceiling plate removing tool 100 is provided with the fulcrum portions 103 on both sides of the rod-like member 101. Thereby, the ceiling plate 8 can be peeled off from the field edge 9 regardless of the positional relationship between the field edge 9 and the ceiling plate 8. For this reason, it becomes possible to perform the removal work of the ceiling board 8 more efficiently.

  Drawing 8 is a side view showing the modification of body part 2 of an embodiment. The main body portion 2 has a first support portion 3 and a second support portion 4.

  The first support portion 3 is provided with a first buffer portion 39 made of a buffer material at an upper portion where the first support portion 3 faces the ceiling plate 8. The first buffer portion 39 uses a buffer material made of resin such as urethane foam.

  The second support portion 4 is provided with a second buffer portion 49 made of a buffer material at a position facing the first support portion 3. The second buffer 49 uses a buffer material such as ○.

  According to the present embodiment, the first support portion 3 is provided with the first buffer portion 39 made of a buffer material at the top. Thereby, the first buffer portion 39 can absorb the impact force generated when the ceiling plate 8 peeled off from the field edge 9 falls and the main surface 81 is supported by the first support portion 3. For this reason, it becomes possible to prevent that the detached ceiling board 8 is damaged. In addition, it is possible to further reduce noise when removing the ceiling plate 8.

  According to the present embodiment, the second support portion 4 is provided with the second buffer portion 49 made of a buffer material at a position facing the first support portion 3. Thereby, the second buffer portion 49 can absorb the impact force generated when the ceiling plate 8 slides the first support portion 3 and the end face 82 is supported by the second support portion 4. For this reason, it becomes possible to prevent that the detached ceiling board 8 is damaged. In addition, it is possible to further reduce noise when removing the ceiling plate 8.

  FIG. 9 is a front view showing an example of the connection mechanism 7 in the embodiment. The ceiling plate support device 1 further includes a connection mechanism 7 that connects the plurality of main body portions 2 with each other. The connection mechanism 7 has through holes 71, 71 formed in the respective main body portions 2, 2 and a connector 72 inserted into the through holes 71, 71. The connector 72 is formed in a U-shape, and screw portions 72a are formed at both ends. A nut 73 is attached to the screw portion 72 a of the connector 72.

  According to the present embodiment, the connection mechanism 7 is further provided to connect the plurality of main body portions 2 with each other. Thereby, the width | variety of the ceiling board 8 which the main-body part 2 can support can be expanded. For this reason, it is possible to improve the efficiency of the removal operation of the ceiling plate 8.

  As mentioned above, although the example of the embodiment of the present invention was explained in detail, any of the above-mentioned embodiments only shows the example of the embodiment in the case of carrying out the present invention. The scope should not be interpreted in a limited manner.

1: Ceiling plate support device 2: Body part 28: Support part 29: Handrail 3: First support part 31: First inclined part 32: First inclined frame material 32a: Groove 33: First connecting frame material 34: Second The inclined portion 35: second inclined frame member 36: second connecting frame member 37a: mounting member 37b: connecting member 37c: mounting member 38: non-slip portion 39: first buffer portion 4: second support portion 49: second buffer portion Part 5: Wheel 6: Stopper 61: Contact part 62: Switching part 7: Coupling mechanism 71: Through hole 72: Coupling tool 73: Nut 8: Ceiling plate 81: Main surface 82: End surface 9: Field edge 99: Floor surface 100 : Ceiling plate removing tool 101: rod-like member 102: claw portion 103: fulcrum portion

Claims (8)

It is a ceiling board support device used when removing a ceiling board fixed to a field edge from said field edge, comprising:
It has a main body for supporting the ceiling plate in which a pair of main surfaces and an end surface connecting the pair of main surfaces are formed,
The body portion is
A first support portion extending at a predetermined angle with respect to the vertical direction to support the main surface;
A ceiling plate support device comprising: a second support portion extending upward from the first support portion to support the end surface. The ceiling plate support device according to claim 1, wherein the first support portion is provided with a first buffer portion made of a buffer material at an upper portion thereof. The ceiling plate support device according to claim 1 or 2, wherein the second support portion is provided with a second buffer portion made of a buffer material at a position facing the first support portion. The first support portion includes a first inclined portion provided with the second support portion, and a second inclined portion attached so as to move in parallel to the first inclined portion. The ceiling board support device according to any one of 1 to 3. A wheel for moving the main body;
The ceiling plate support device according to any one of claims 1 to 4, further comprising: a stopper for controlling movement by the wheel. The ceiling plate support device according to any one of claims 1 to 5, further comprising: a connecting mechanism that connects the plurality of main body portions to each other. It is a ceiling board removal method of removing the ceiling board fixed to the field edge, and
A removal process of removing the ceiling board in which a pair of main surfaces and an end face connecting the pair of main surfaces are formed using the ceiling plate support device according to any one of claims 1 to 6,
In the removal process,
Peeling off the ceiling plate from the edge of the field;
And supporting the main surface of the peeled ceiling board on the first support portion and supporting the end face of the ceiling board on the second support portion. Method. It is a ceiling board removal method of removing the ceiling board fixed to the field edge, and
Between a rod-like member extending in a first direction, a claw extending in a second direction orthogonal to the first direction from one end of the rod-like member, and the other end of the rod-like member and the claw A ceiling plate removing tool provided with a fulcrum portion provided and extending in a third direction orthogonal to the first direction and the second direction, and the ceiling plate supporting device according to any one of claims 1 to 6, And removing the ceiling plate on which the pair of main surfaces and the end surface connecting the pair of main surfaces are formed,
The removal process is
Arranging the claws on the main surface on the upper side of the ceiling plate and arranging the fulcrum on the lower surface side of the rim;
A peeling step of rotating the rod-like member such that the fulcrum is the rotation axis, and peeling the ceiling plate from the edge by the claw;
And supporting the main surface of the peeled ceiling board on the first support portion and supporting the end face of the ceiling board on the second support portion. Method.

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