Ceiling board installation aid and ceiling board installation method

Abstract

This invention provides a new ceiling board installation aid and a ceiling board installation method that can improve the workability of attaching ceiling boards to ceiling joists. [Solution] The ceiling board installation aid 10 according to the present disclosure is a ceiling board installation aid 10 to be attached to a first ceiling board 61 fixed to a joist 50 of the ceiling 3 of a building, and comprises a locking portion 15 that is attached to the first ceiling board 61 by locking onto the head of a fastening member 12 that fixes the first ceiling board 61 to the joist 50, and a ceiling board holding portion 18 that supports a second ceiling board 62 positioned adjacent to the end of the first ceiling board 61 from below, wherein the locking portion 15 has a locking hole 11 in which a first hole 11a through which the head of the fastening member 12 can pass in the vertical direction and a second hole 11b through which the head cannot pass in the vertical direction but the shaft portion of the fastening member 12 can pass are connected in plane.

Description

Technical Field

[0001] The present disclosure relates to a ceiling board construction aid and a method for constructing a ceiling board.

Background Art

[0002] Conventionally, when an operator attaches a ceiling board to the ceiling edge with nails, screws, etc. alone, the operator supports the ceiling board with their head or uses a long rod extending from the floor to support the ceiling board while working. However, with these methods, the operator's body posture becomes unstable and the operator is likely to consume physical strength, so improvement in workability has been demanded.

[0003] In response to such problems, for example, Patent Documents 1 and 2 disclose ceiling board construction aids that can hook one end of a ceiling board. The operator attaches these ceiling board construction aids to an already attached ceiling board or the ceiling edge, and can fix the other end to the edge with screws, etc. while supporting one end of the ceiling board to be attached with the ceiling board construction aid.

Prior Art Documents

Patent Documents

[0004]

Patent Document Ⅰ

Patent Document Ⅱ

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, with the ceiling board installation aid described in Patent Document 1, it was necessary to fix the ceiling board installation aid to an already installed ceiling board, perform the ceiling board installation work, and then completely remove the screws and other fasteners from the ceiling board to remove the ceiling board installation aid. Furthermore, with the ceiling board installation aid described in Patent Document 2, there were cases where the ceiling board and the mounting part interfered with each other when the ceiling board was brought into contact with the ceiling joists, impairing work efficiency, so there was still room for improvement in these respects.

[0006] This disclosure has been made in view of these issues, and its purpose is to provide a new ceiling board installation aid and a ceiling board installation method that can improve the workability of attaching ceiling boards to ceiling joists. [Means for solving the problem]

[0007] This disclosure was made to solve the above-mentioned problems, and the ceiling board installation aid of this disclosure is [1] A ceiling board installation aid that is attached to a first ceiling board fixed to the ceiling joists of a building, A locking portion that is attached to the first ceiling board by engaging with the head of a fastening member that fixes the first ceiling board to the furring strip, A ceiling board holding part that supports a second ceiling board positioned adjacent to the end of the first ceiling board from below, Equipped with, The aforementioned locking portion is, A locking hole in which a first hole through which the head of the fastening member can pass in the vertical direction and a second hole through which the head cannot pass in the vertical direction but the shaft of the fastening member can pass are connected in plane, or A locking slot through which the head cannot pass in the vertical direction and through which the shaft portion of the fastening member can pass, wherein one end of the locking slot terminates inside the locking portion in a plan view and the other end extends to the outer edge of the locking portion in a plan view. It is characterized by having the following.

[0008] Furthermore, the ceiling board installation aid described herein is [2] In the configuration described in [1] above, it is preferable that the second hole is located in the locking hole on a side closer to the ceiling board holding portion than the first hole.

[0009] Furthermore, the ceiling board installation aid described herein is [3] In the configuration described in [1] or [2] above, it is preferable that a plurality of locking holes are arranged in a line in the direction connecting the locking portion and the ceiling board holding portion.

[0010] Furthermore, the ceiling board installation aid described herein is [4] In the configuration described in any of [1] to [3] above, it is preferable that the surface of the ceiling board holding portion that supports the second ceiling board and the surface of the locking portion that contacts the first ceiling board are formed to be substantially parallel.

[0011] Furthermore, the ceiling board installation aid described herein is [5] In any of the configurations described in [1] to [4] above, it is preferable that the edge of the ceiling board holding portion opposite to the locking portion has a convex shape in plan view, with the central portion protruding toward the opposite side of the locking portion.

[0012] Furthermore, the ceiling board installation aid described herein is [6] A fastening part that is attached to the ceiling joists of the building from above, When the aforementioned fastening portion is installed on the ceiling joist, A latching base extending horizontally from the lower part of the latching portion, A ceiling board mounting portion is located below the lower surface of the aforementioned joist, extends parallel to the aforementioned fastening base, and is movably mounted relative to the aforementioned fastening base. Equipped with, When the hooking portion is installed on the eaves edge, the ceiling board placement portion is movable relative to the hooking base between a use position extending beyond the eaves edge from the hooking base and a retracted position extending to the side opposite to the eaves edge from the hooking base.

[0013] Also, the ceiling board construction aid of the present disclosure [7] In the configuration described in [6] above, the hooking portion preferably includes a top plate that covers the eaves edge from above, a long hanging piece that extends downward along one side surface of the eaves edge from one end portion of the top plate and is continuous with the hooking base, and a short hanging piece that extends downward along the other side surface of the eaves edge from the other end portion of the top plate and has a shorter length in the vertical direction than the long hanging piece.

[0014] Also, the ceiling board construction aid of the present disclosure [8] In the configuration described in [7] above, the short hanging piece preferably extends in a direction approaching the other side surface of the eaves edge downward.

[0015] Also, the ceiling board construction aid of the present disclosure [9] In the configuration described in [7] or [8] above, the eaves edge preferably has an opening or recess in the one side surface, and the long hanging piece preferably has a claw portion that engages with the opening or recess.

[0016] Also, the ceiling board construction aid of the present disclosure

[10] In the configuration described in any one of [7] to [9] above, the eaves edge preferably has an opening or recess on the upper surface, and the top plate preferably has a claw portion that engages with the opening or recess.

[0017] Also, the ceiling board construction aid of the present disclosure

[11] In the configuration described in any one of [7] to

[10] above, a magnet is preferably arranged on the upper portion of the top plate.

[0018] Furthermore, the installation method for the ceiling boards described herein is:

[12] The fastening portion of the ceiling board installation aid described in any of [6] to

[11] above is fastened to the joist from above, Moving the ceiling board mounting section to the retracted position, Pressing the end of the ceiling board against the joist from below, The ceiling board mounting portion is moved to the usage position to support the end of the ceiling board from below. It is characterized by containing the following.

[0019] Furthermore, the installation method for the ceiling boards described herein is:

[13] The locking portion of the ceiling board installation aid described in any of [1] to [5] above is to be locked onto the head of the fastening member for fixing the first ceiling board which is already fixed to the joist, The ceiling board installation aid described in any of the above [6] to

[11] is to be attached to another joist, The end of the second ceiling board is placed on the ceiling board holding portion of the ceiling board installation aid described in any of [1] to [5] above, Moving the ceiling board mounting portion of the ceiling board installation aid described in any of the above [6] to

[11] to the retracted position, Pressing the end of the second ceiling board against the other joist from below, The ceiling board mounting portion is moved to the position of use to support the end of the second ceiling board from below. It is characterized by containing the following.

[0020] Furthermore, the installation method for the ceiling boards described herein is:

[14] The locking portion of the ceiling board installation aid described in any of [1] to [5] above is to be locked onto the head of a fastening member that is not fully fastened, which is used to fasten the first ceiling board that has already been fixed to the joist. The end of the second ceiling board is placed on the ceiling board holding portion of the ceiling board installation aid described in any of [1] to [5] above, Pressing the end of the second ceiling board against the other joist from below, Remove any of the ceiling board installation aids described in [1] to [5] above, To fully fasten the fastening member that is not fully fastened It is characterized by containing the following.

[0021] Furthermore, the installation method for the ceiling boards described herein is:

[15] The locking portion of the ceiling board installation aid described in any of [1] to [5] above is to be locked onto the head of a fastening member that is not fully fastened, which is used to fasten the first ceiling board that has already been fixed to the joist. The ceiling board installation aid described in any of the above [6] to

[11] is to be attached to another joist, The end of the second ceiling board is placed on the ceiling board holding portion of the ceiling board installation aid described in any of [1] to [5] above, Moving the ceiling board mounting portion of the ceiling board installation aid described in any of the above [6] to

[11] to the retracted position, Pressing the end of the second ceiling board against the other joist from below, The ceiling board mounting section is moved to the position of use to support the end of the second ceiling board from below, Remove any of the ceiling board installation aids described in [1] to [5] above, To fully fasten the fastening member that is not fully fastened It is characterized by containing the following. [Effects of the Invention]

[0022] According to this disclosure, it is possible to provide a new ceiling board installation aid and a ceiling board installation method that can improve the workability of attaching ceiling boards to ceiling joists. [Brief explanation of the drawing]

[0023] [Figure 1] This is a front cross-sectional view showing a ceiling structure constructed using first and second ceiling board installation aids according to one embodiment of the present disclosure. [Figure 2A] This is a plan view showing the configuration of a second ceiling board installation aid according to one embodiment of the present disclosure. [Figure 2B] This is a front view showing the configuration of a second ceiling board installation aid according to one embodiment of the present disclosure. [Figure 2C] This is a perspective view showing the configuration of a second ceiling board installation aid according to one embodiment of the present disclosure. [Figure 2D] This is a plan view showing a modified example of a second ceiling board installation aid according to one embodiment of the present disclosure. [Figure 3A] This is a plan view showing the configuration of a first ceiling board installation aid according to one embodiment of the present disclosure. [Figure 3B] This is a front view showing the configuration of a first ceiling board installation aid according to one embodiment of the present disclosure. [Figure 3C] This is a perspective view showing the configuration of a first ceiling board installation aid according to one embodiment of this disclosure. [Figure 3D] This is a front view showing the configuration of a first ceiling board installation aid (retracted position) according to one embodiment of the present disclosure. [Figure 4A] This is a plan view showing the configuration of a first ceiling board installation aid (modified example) according to one embodiment of the present disclosure. [Figure 4B] This is a front view showing the configuration of a first ceiling board installation aid (modified example) according to one embodiment of the present disclosure. [Figure 5] This is a flowchart showing the procedure for implementing the ceiling board installation method (first half) according to one embodiment of this disclosure. [Figure 6] This figure shows an example of ceiling board installation performed by the ceiling board installation method (first half) according to one embodiment of the present disclosure. [Figure 7]This flowchart shows the procedure for implementing the ceiling board installation method (second half) according to one embodiment of this disclosure. [Figure 8] This figure shows an example of ceiling board installation performed by the ceiling board installation method (second half) according to one embodiment of the present disclosure. [Modes for carrying out the invention]

[0024] The present disclosure will be described in more detail below with reference to the drawings.

[0025] Figure 1 is a front view showing the configuration of a building ceiling structure 1 including ceiling boards (first ceiling boards 61, etc.) installed by ceiling board installation aids 10, 20A according to one embodiment of the present disclosure. The building ceiling structure 1 comprises a beam member 2 that constitutes the frame of the residential part of the building, a vibration-damping suspension member 5 fixed to the beam member 2 and hanging down from the beam member 2, a joist support 6 attached to the lower end of the vibration-damping suspension member 5, joists 50 fixed to the lower surface of the joist support 6 and arranged at approximately regular intervals, and first ceiling boards 61, etc. fixed to the lower surface of the joists 50. In Figure 1, the building is described as having a ceiling-dominant configuration, but it may also have a wall-dominant configuration.

[0026] In this specification, claims, and drawings, the vertical direction of the building's ceiling structure 1 is defined as the vertical direction in Figure 1, with the side where the floor support member 8 is located being considered upwards and the side where the first ceiling board 61, etc., is located being considered downwards.

[0027] The building employing the ceiling structure 1 according to this embodiment is a steel structure building having a steel frame and multiple floors. In this embodiment, the building is described as having two floors, but it may have three or more floors.

[0028] The building consists of a reinforced concrete foundation structure (not shown) fixed to the ground, and a residential structure fixed to the foundation structure, which has a frame structure consisting of members such as column members and beam members 2. The members constituting the frame structure are standardized and are manufactured in advance at a factory before being transported to the construction site and assembled. Thus, the building according to this embodiment is preferably applied to industrialized buildings, prefabricated buildings, system buildings, etc.

[0029] The foundation structure is located below the frame and supports the frame. Specifically, the foundation structure is a reinforced concrete strip foundation, comprising a footing section and a rising section that serves as a foundation beam. Furthermore, a column base fixing section is provided at the upper end of the rising section of the foundation structure for fixing the column bases of the frame members, with anchor bolts protruding from the upper surface of the rising section.

[0030] The residential structure of this embodiment comprises a steel frame structure composed of multiple column members and multiple beam members 2 erected between the column members, an outer wall arranged on the outer perimeter of this frame structure, and a partition body that separates the upper floor indoor space from the lower floor indoor space. Note that the frame structure does not necessarily have to be made of steel.

[0031] The exterior wall includes an exterior member, an insulation member, and an interior member. The exterior member can be made of panels of, for example, autoclaved light weight concrete (hereinafter referred to as "ALC, etc.", where "ALC" is an abbreviation for "autoclaved light weight concrete"), and the outer layer of the exterior wall can be formed by connecting multiple ALC panels around the frame. The insulation member can be made of foamed resin materials such as phenolic foam, polystyrene foam, or urethane foam, and the insulation layer of the exterior wall can be formed by connecting it along the inner surface of the outer layer formed by the exterior member described above. Furthermore, the interior member can be made of, for example, gypsum board, and the inner layer of the exterior wall can be formed by connecting it to the inside of the insulation layer.

[0032] The partition includes the floor support member 8 and the ceiling 3 shown in Figure 1. Here, "partition" refers to a collection of members that separate the upper floor indoor space from the lower floor indoor space, excluding the framework, and located between the ceiling of the lower floor indoor space and the floor of the upper floor indoor space. Therefore, in addition to the floor support member 8 and ceiling 3 mentioned above, the partition is a concept that includes, for example, floor interior materials such as flooring that constitute the floor surface of the upper floor indoor space, which are stacked on the floor support member 8. In this embodiment, the partition separates the indoor space of the second floor, which is the upper floor indoor space, from the indoor space of the first floor, which is the lower floor indoor space.

[0033] The floor support member 8 can be made of, for example, ALC panels. The floor support member 8 is erected on the beam member 2 and is supported directly or indirectly by the beam member 2.

[0034] The ceiling 3 comprises ceiling boards (such as the first ceiling board 61) that constitute the ceiling surface of the indoor space of the lower floor, and furring strips 50 that are provided above the ceiling boards and support the ceiling boards from above.

[0035] The ceiling joists 50 extend horizontally (left-right direction in Figure 1) and are attached to ceiling joist supports 6 suspended by vibration-damping suspension members 5 that hang down from beam members 2 constituting the frame. They extend approximately horizontally and perpendicular to the plane of the paper in Figure 1. In this embodiment, the ceiling joists 50 are formed from square steel with a rectangular cross-section and are arranged at approximately predetermined intervals in the direction of arrangement of the ceiling joists 50 (left-right direction in Figure 1). In addition, end joists are fixed to the wall portion 9 of the indoor space of the lower floor at the ends of the ceiling joists 50 in the direction of arrangement. Various types of steel materials such as H-shaped, L-shaped, I-shaped, and U-shaped can be used for the ceiling joists 50, in addition to the rectangular cross-section. Furthermore, the ceiling joists 50 may be constructed using wood or other materials in addition to steel. The members used for the ceiling joists 50 are preferably members that conform to JIS A 6517 Steel Substrates for Buildings (Walls and Ceilings).

[0036] As shown in Figure 1, a first ceiling board 61 is provided on the underside of the ceiling joist 50. The first ceiling board 61 is made of, for example, gypsum board. Alternatively, the first ceiling board 61 may be made of, for example, a breathable building material.

[0037] The vibration-damping suspension member 5 that supports the ceiling joist support 6 is equipped with vibration-damping rubber and has the function of suppressing the transmission of impacts from the floor surface of the upper floor indoor space to the ceiling 3 through the beam member 2.

[0038] In the frame of this embodiment, multiple column members are erected on a foundation structure (not shown), and multiple beam members 2 are fixed between the column members.

[0039] Figures 2A to 2C show the configuration of a ceiling board installation aid 10 (second ceiling board installation aid) according to one embodiment of the present disclosure. The ceiling board installation aid 10 is a ceiling board installation aid 10 that is attached to a first ceiling board 61 which is already fixed to the joists 50 of the ceiling 3 of a building, and comprises a locking portion 15 which is attached to the first ceiling board 61 by locking onto the head of a fastening member 12 (see Figures 2B and 8) that fixes the first ceiling board 61 to the joists 50, and a ceiling board holding portion 18 which supports the second ceiling board 62 which is positioned adjacent to the end of the first ceiling board 61 from below.

[0040] In this specification, claims, and drawings, the left direction in Figure 2A represents the front of the ceiling board installation aid 10, and the right direction in Figure 2A represents the rear of the ceiling board installation aid 10. The up and down direction in Figure 2A represents the left and right direction of the ceiling board installation aid 10. The direction perpendicular to the plane of the paper in Figure 2A (the up and down direction in Figure 2B) represents the up and down direction of the ceiling board installation aid 10.

[0041] As shown in Figures 2A and 2B, the locking portion 15 is a flat plate-shaped part having a substantially rectangular shape in plan view, with the longitudinal direction being the direction (front-to-back direction) connecting the locking portion 15 and the ceiling board holding portion 18. An R-shaped end face 13, which has a semicircular shape in plan view, is formed at the end of the locking portion 15 opposite (rear side) to the ceiling board holding portion 18. As shown in Figure 2A, multiple locking holes 11 are arranged in a row on the locking portion 15 in the front-to-back direction connecting the locking portion 15 and the ceiling board holding portion 18. In the example shown in Figure 2A, two locking holes 11 are arranged in a row, but there may be three or more.

[0042] The locking hole 11 is a key-shaped hole in which the head of a fastening member 12, such as a screw, used to fix the first ceiling board 61 to the joist 50, can pass through in the vertical direction, and the head of a second hole 11b cannot pass through in the vertical direction, are connected in plane by a connecting portion 11c. That is, the diameter of the head of the fastening member 12 is smaller than the diameter of the first hole 11a and larger than the diameter of the second hole 11b, so the first hole 11a is a large-diameter hole and the second hole 11b is a small-diameter hole. The shaft of the fastening member 12 can pass through the first hole 11a, the second hole 11b and the connecting portion 11c. The worker loosens the fastening member 12 that fixes the first ceiling board 61 to the joist 50 by rotating it slightly counterclockwise, and then, as shown in Figure 2A, passes the head of the fastening member 12 through the first hole 11a from the back to the front in the direction perpendicular to the plane of the paper. Next, the ceiling board installation aid 10 is moved to the rear (to the right in Figure 2A), and the head of the fastening member 12 is moved toward the second hole 11b. With the fastening member 12 inside the second hole 11b, the fastening member 12 is tightened clockwise, thereby attaching the ceiling board installation aid 10 to the first ceiling board 61 (see step S201 in Figure 7 and Figure 8).

[0043] The ceiling board holder portion 18 has a widened portion 16 that widens in the left-right direction toward the front end of the locking portion 15, and the edge portion 17 (front end) opposite to the locking portion 15 has a convex shape in plan view, with the left-right central portion protruding toward the front opposite to the locking portion 15. In the example in Figure 2A, the edge portion 17 of the ceiling board holder portion 18 opposite to the locking portion 15 has a roughly arc shape in plan view.

[0044] As described above, because the ceiling board holding portion 18 is widened in the left-right direction, when the locking portion 15 of the ceiling board installation aid 10 is attached to the first ceiling board 61 as shown in Figure 8, the second ceiling board 62, which is positioned adjacent to the first ceiling board 61, can be stably supported over a wider area. Furthermore, because the edge portion 17 of the ceiling board holding portion 18 opposite to the locking portion 15 has a convex shape (approximately an arc shape in the illustrated example) with its left-right central portion protruding forward (left side in Figure 2A), when inserting the second ceiling board 62 into the space between the ceiling board holding portion 18 and the ceiling joist 50 from the front (left side in Figure 2B), the contact length between the end of the second ceiling board 62 and the edge portion 17 of the ceiling board holding portion 18 can be shortened, making it less likely to get caught. Figure 2B shows the furring strips 50, the first ceiling board 61, the second ceiling board 62, and the fastening member 12 with dashed lines, after the ceiling board installation aid 10 has been attached to the first ceiling board 61 and the second ceiling board 62 has been inserted.

[0045] In the example shown in Figure 2A, the edge portion 17 is configured to have a substantially circular arc shape in plan view, but the configuration is not limited to this. The edge portion 17 can have any convex shape, such as an elliptical arc shape, where the central part protrudes forward (to the left in Figure 2A).

[0046] In this embodiment, the second hole 11b of the key-shaped locking hole 11 is positioned closer to the ceiling board holding portion 18 and further forward than the first hole 11a. With this configuration, when the second ceiling board 62 is inserted from the front into the space between the ceiling board holding portion 18 and the furring strip 50, even if the ceiling board installation aid 10 is pushed backward by the second ceiling board 62, the fastening member 12 can contact the front end of the second hole 11b and remain inside the second hole 11b. Therefore, it is possible to effectively prevent the head of the fastening member 12 from passing through the first hole 11a and causing the ceiling board installation aid 10 to come off.

[0047] In this embodiment, when using the ceiling board installation aid 10 (when the ceiling board holding part 18 is holding the second ceiling board 62), the ceiling board installation aid 10 is attached to the first ceiling board 61 so that the fastening member 12 passes through the second hole 11b. When removing the ceiling board installation aid 10, the fastening member 12 is slightly loosened and the ceiling board installation aid 10 is moved forward so that the fastening member 12 passes through the first hole 11a. This movement allows the head of the fastening member 12 to pass inside the first hole 11a, so the ceiling board installation aid 10 can be removed from the first ceiling board 61 with the fastening member 12 loosened, without completely removing the fastening member 12 from the first ceiling board 61.

[0048] As shown in Figure 2C, the ceiling board installation aid 10 is provided with ribs 10e surrounding its outer edge, which increases its bending strength. Furthermore, a central opening 18a is provided at the center of the widened section 16 in the left-right direction, thereby reducing the weight of the ceiling board installation aid 10. The ceiling board installation aid 10 can be made of synthetic resin or metal such as aluminum.

[0049] In this embodiment, as shown in Figure 2A, the locking portion 15 has two locking holes 11 arranged side by side in the front-to-back direction connecting the locking portion 15 and the ceiling board holding portion 18. With this configuration, when the ceiling board installation aid 10 is fixed using the front locking hole 11, which is closer to the ceiling board holding portion 18, the force with which the ceiling board holding portion 18 holds the second ceiling board 62 can be made more stable. On the other hand, when the ceiling board installation aid 10 is fixed using the rear locking hole 11, which is further away from the ceiling board holding portion 18, the ceiling board holding portion 18 can be moved significantly further back from the second ceiling board 62 by rotating the ceiling board installation aid 10 180 degrees around the axis of the second hole portion 11b while the fastening member 12 is loosened. Therefore, in the configuration shown in Figure 8, which will be described later, it is possible to effectively prevent the adjacent ceiling board installation aid 10 from interfering with the work when fastening the surface of the second ceiling board 62 covered by the ceiling board holding portion 18 with the fastening member. Furthermore, by providing a smooth R-shaped end face 13 at the rear end of the ceiling board installation aid 10, it is possible to ensure that fastening work on the second ceiling board 62 is not obstructed when the ceiling board installation aid 10 is rotated 180 degrees.

[0050] In this embodiment, the surface of the ceiling board holding portion 18 that supports the second ceiling board 62 and the surface of the locking portion 15 that contacts the first ceiling board 61 are formed to be substantially parallel (on the same plane). This configuration makes the entire ceiling board installation aid 10 flat and therefore less bulky. Thus, the portability of the ceiling board installation aid 10 can be improved. Note that the surface of the ceiling board holding portion 18 that supports the second ceiling board 62 and the surface of the locking portion 15 that contacts the first ceiling board 61 do not necessarily have to be on the same plane; the two surfaces may be separated in the vertical direction while remaining substantially parallel. Also, the two surfaces do not necessarily have to be substantially parallel.

[0051] The configuration of the ceiling board installation aid 10 is not limited to the configurations shown in Figures 2A to 2C. For example, instead of the locking holes 11 shown in Figures 2A to 2C, a locking elongated hole 11d may be provided, as shown in Figure 2D, for the ceiling board installation aid 10B, which extends in the front-rear direction and extends to the outer edge of the rear end of the locking portion 15. The locking elongated hole 11d is an elongated hole that is long in the front-rear direction (left-right direction in Figure 2D), so that the head of the fastening member 12 cannot pass through in the vertical direction, but the shaft of the fastening member 12 can pass through. One end (front end) of the locking elongated hole 11d terminates inside the locking portion 15 in a plan view, while the other end (rear end) extends to the outer edge of the locking portion 15 in a plan view.

[0052] By moving the ceiling board installation aid 10B forward (to the left in Figure 2D) with the shaft portion of the fastening member 12 passing through the locking slot 11d, the shaft portion of the fastening member 12 can pass through the rear end of the locking slot 11d (the area where the outer edge of the locking portion 15 and the locking slot 11d intersect) to the outside of the locking portion 15. Therefore, the fastening member 12 can be removed from the first ceiling board 61 simply by moving the ceiling board installation aid 10B forward while the fastening member 12 is loosened, without completely removing the fastening member 12 from the first ceiling board 61.

[0053] Figure 2D shows an example in which the locking slot 11d extends in the front-to-back direction (left-to-right direction in Figure 2D), but the embodiment is not limited to this. The locking slot 11d may also extend in the left-to-right direction (up-to-down direction in Figure 2D) and extend to the outer edge of the locking portion 15.

[0054] In this disclosure, "the other end of the locking slot 11d extends to the outer edge of the locking portion 15 in a plan view" means that the locking slot 11d extends to the outer edge of the locking portion 15 while maintaining a width that allows the shaft portion of the fastening member 12 to pass through it, and that it is connected to the outside of the locking portion 15.

[0055] In the example shown in Figure 2D, the rib 10e is also provided in the portion adjacent to the locking slot 11d in the left-right direction (up-down direction in Figure 2D) at the outer edge (rear end) of the locking portion 15, but the configuration is not limited to this. The rib 10e may be omitted in the portion adjacent to the locking slot 11d in the left-right direction, so that the head of the fastening member 12 does not interfere with the rib 10e even when the ceiling board installation aid 10B is moved forward.

[0056] Figures 3A to 3C show the configuration of a ceiling board installation aid 20A (first ceiling board installation aid) according to one embodiment of the present disclosure. The ceiling board installation aid 20A plays a role in simplifying the work of attaching the first ceiling board 61 to the ceiling joists 50 by supporting one end of the first ceiling board 61 in the longitudinal direction (up and down direction in Figure 6) with the ceiling board installation aid 20A when attaching the first ceiling board 61 to the ceiling joists 50.

[0057] The ceiling board installation aid 20A includes a fastening portion 21 that is fastened from above to the joists 50 of the building's ceiling 3, a fastening base portion 24 that extends horizontally away from the joists 50 when the fastening portion 21 is installed on the joists 50, and a ceiling board mounting portion 25 that is located below the lower surface of the joists 50, extends parallel to the fastening base portion 24, and is movably mounted on the fastening base portion 24.

[0058] In this specification, claims, and drawings, the left direction in Figure 3A represents the front of the ceiling board installation aid 20A, and the right direction in Figure 3A represents the rear of the ceiling board installation aid 20A. The up and down direction in Figure 3A represents the left and right direction of the ceiling board installation aid 20A. The direction perpendicular to the plane of Figure 3A (the up and down direction in Figure 3B) represents the up and down direction of the ceiling board installation aid 20A.

[0059] When the fastening portion 21 is installed on the ceiling joist 50, the ceiling board mounting portion 25 is movable relative to the fastening base 24 between a working position (see Figures 3A and 3B) that extends beyond the ceiling joist 50 from the fastening base 24 and a retracted position (see Figure 3D) that extends away from the fastening base 24 on the opposite side of the ceiling joist 50, in both plan and front views. In this embodiment, the ceiling board mounting portion 25 is movable relative to the fastening base 24 by rotating relative to the fastening base 24 around the axis of the pivot shaft member 26.

[0060] As shown in Figure 3B, the latching portion 21 includes a top plate 23 that covers the joist 50 from above, a long hanging piece 22a that extends downward from one end of the top plate 23 along one side 51 of the joist 50 and connects to the latching base 24, and a short hanging piece 22c that extends downward from the other end of the top plate 23 along the other side 52 of the joist 50 and has a shorter vertical length than the long hanging piece 22a. The long hanging piece 22a and the short hanging piece 22c function as movement restricting portions 22 that restrict the movement of the latching portion 21 in the front-rear direction relative to the joist 50.

[0061] The short hanging piece 22c extends downwards, inclined towards the other side 52 of the joist 50 (forward). This configuration allows the lower end of the short hanging piece 22c to firmly contact the other side 52 of the joist 50, thereby firmly fixing the fastening portion 21 to the joist 50. In particular, in this embodiment, recesses 52a are provided at two locations in the vertical direction on the other side 52 of the joist 50, and the lower end of the short hanging piece 22c fits into these recesses 52a, effectively suppressing misalignment between the fastening portion 21 and the joist 50. In the example shown in Figure 3B, recesses 51a, 52a, 53a, and 54a are provided on one side 51, the other side 52, the top surface 53, and the bottom surface 54 of the joist 50, respectively.

[0062] In Figure 3B, the first ceiling board 61 or the second ceiling board 62 placed on the ceiling board mounting section 25 at the position where the ceiling board installation aid 20A is used are shown with dashed lines.

[0063] In this embodiment, the long hanging piece 22a has a claw portion 22b that engages with the recess 51a. This configuration allows the hook portion 21 of the ceiling board installation aid 20A to be firmly fixed to the ceiling joist 50. Therefore, displacement of the ceiling board installation aid 20A and the ceiling board relative to the ceiling joist 50 can be effectively suppressed. In particular, in the examples shown in Figures 3A to 3D, vertical displacement of the ceiling board installation aid 20A relative to the ceiling joist 50 can be effectively suppressed.

[0064] Furthermore, the recesses 51a, 52a, 53a, and 54a of the ceiling joist 50 may be omitted in part or entirely. In that case, the presence or absence of the claw portion 22b, the location where it is provided, the inclination angle of the short hanging piece 22c, etc., can be appropriately changed according to the specifications of the ceiling joist 50.

[0065] In this embodiment, a magnet 23a is attached to the upper surface of the top plate 23 of the fastening part 21. With this configuration, when the ceiling board installation aid 20A is not in use, the fastening part 21 can be held in place by the attractive force of the magnet 23a. Therefore, no storage space is needed when the ceiling board installation aid 20A is not in use. Furthermore, when the fastening part 21 is fastened to the steel ceiling joist 50 during use, the attractive force of the magnet 23a can further firmly secure the fastening part 21 to the ceiling joist 50. Note that a configuration without the magnet 23a is also possible.

[0066] Figures 4A to 4B show the configuration of a modified example of the ceiling board installation aid 20B (first ceiling board installation aid) according to one embodiment of the present disclosure. This modified example is similar in configuration to the ceiling board installation aid 20A shown in Figures 3A to 3D, except for two points: recesses 51a and 52a are not provided on one side 51 and the other side 52 of the joist 50, and an opening 53b is provided on the upper surface 53 instead of a recess 53a; and instead of a claw portion 22b being provided on the long hanging piece 22a of the fastening portion 21, a claw portion 23b is provided on the lower surface of the top plate 23. Therefore, this explanation will focus on the differences from the configuration of the ceiling board installation aid 20A.

[0067] In the modified example shown in Figures 4A to 4B, a ceiling joist 50 is used, which has an M-shaped cross-section and an opening 53b on its upper surface 53. On the other hand, the latching portion 21 of the ceiling board installation aid 20B is provided with a pair of claw portions 23b that incline forward and backward downward from approximately the center of the lower surface of the top plate 23 in the front-rear direction. When the latching portion 21 is latched to the ceiling joist 50, the pair of claw portions 23b abut against and lock onto the front and rear ends of the opening 53b of the ceiling joist 50, as shown in Figure 4B. This configuration allows the latching portion 21 of the ceiling board installation aid 20B to be firmly fixed to the ceiling joist 50. Therefore, displacement of the ceiling board installation aid 20B and the ceiling board relative to the ceiling joist 50 can be effectively suppressed. In particular, in the example shown in Figures 4A to 4B, displacement of the ceiling board installation aid 20B in the front-rear direction relative to the ceiling joist 50 can be effectively suppressed.

[0068] Figure 4B shows the first ceiling board 61 or the second ceiling board 62 pressed against the underside of the ceiling joist 50, indicated by a dashed line.

[0069] In the examples shown in Figures 4A and 4B, there is no recess 52a on the other side 52 of the joist 50, but the short hanging piece 22c extends downwards, inclined toward the other side 52 of the joist 50 (forward). This configuration allows the lower end of the short hanging piece 22c to firmly contact the other side 52 of the joist 50, thereby firmly fixing the fastening portion 21 to the joist 50.

[0070] In the ceiling board installation aid 20B shown in Figures 4A to 4B, the top plate 23 does not have a magnet 23a, but a magnet 23a may be provided as in Figures 3A to 3D.

[0071] Next, the method for installing the ceiling boards in this embodiment will be explained using flowcharts (Figures 5 and 7) illustrating the procedure. The method for installing the ceiling boards consists of the first half of the procedure (Figure 5) in which the first ceiling board 61 is installed using the ceiling board installation aid 20A or 20B (first ceiling board installation aid), and the second half of the procedure (Figure 7) in which the second ceiling board 62 is installed using the ceiling board installation aid 20A or 20B (first ceiling board installation aid) and the ceiling board installation aid 10 (second ceiling board installation aid). In the following explanation, the case in which the ceiling board installation aid 20A shown in Figures 3A to 3D is used as the first ceiling board installation aid will be explained as an example.

[0072] First, the first part of the ceiling board installation method (installation of the first ceiling board 61) will be explained. The worker installing the ceiling boards hooks the fastening part 21 of the ceiling board installation aid 20A (first ceiling board installation aid) onto the joist 50 from above (step S101 in Figure 5). The joist 50 to which the ceiling board installation aid 20A is hooked is the joist 50 to which one end of the first ceiling board 61 (the lower end in Figure 6) is placed, as shown in Figure 6. In step S101, the fastening part 21 is brought closer to the joist 50 from above, and the lower ends of the claw part 22b and the short hanging piece 22c enter into the recesses 51a and 52a respectively, and the joist is fixed in a position where the lower surface of the top plate 23 abuts against the upper surface of the joist 50. Preferably, when the latching portion 21 is attached to the joist 50, the claw portion 22b is pressed against one side surface 51 of the joist 50 where there is no recess 51a and is housed within the long hanging piece 22a, and where there is a recess 51a, it protrudes from the long hanging piece 22a due to the biasing force and enters into the recess 51a.

[0073] Next, the worker moves the ceiling board mounting portion 25 of the ceiling board installation aid 20A to the retracted position shown in Figure 3D (step S102 in Figure 5). This retraction of the ceiling board mounting portion 25 is performed by rotating the ceiling board mounting portion 25 around the pivot shaft member 26 in Figure 3B. This retraction exposes the lower part of the furring strip 50, as shown in Figure 3D, making it easier to bring the end of the first ceiling board 61 closer to the lower surface of the furring strip 50 from below. The pivot shaft member 26 functions as a pivot shaft by combining a bolt 26a and a nut 26b.

[0074] Next, the worker moves the first ceiling board 61 to the vicinity of the desired fixing position and presses the end of the first ceiling board 61 against the furring strip 50 from below (step S103 in Figure 5). Once the worker determines that the end of the first ceiling board 61 is positioned correctly on the underside of the furring strip 50 (the position during installation), the worker rotates the ceiling board mounting section 25 to the usage position shown in Figure 3B to support the end of the first ceiling board 61 from below (step S104 in Figure 5).

[0075] After supporting one end of the first ceiling board 61 with the ceiling board installation aid 20A, the worker supports the other end of the first ceiling board 61 and fixes the first ceiling board 61 in the designated position with fasteners such as screws. Following these steps, the installation of the first ceiling board 61 shown in Figure 5 is completed.

[0076] Next, we will explain the second half of the ceiling board installation method (installation of the second ceiling board 62).

[0077] The worker locks the locking portion 15 of the ceiling board installation aid 10 (second ceiling board installation aid) onto the head of the fastening member 12 for fixing the first ceiling board 61, which is already fixed to the ceiling joist 50 (step S201 in Figure 7). When performing step S201, the worker loosens the fastening member 12 (the fastening member labeled 12 in Figure 7) in a position suitable for fixing the ceiling board installation aid 10 by turning it slightly beforehand until it is not fully fastened.

[0078] When securing the ceiling board installation aid 10 to the head of the fastening member 12, first, the head of the loosened fastening member 12 is made to pass through the first hole 11a of the fastening hole 11, bringing the fastening portion 15 into contact with the first ceiling board 61. Next, the ceiling board installation aid 10 is moved backward (to the right in Figure 2A, upward in Figure 8) to position the fastening member 12 so that it passes through the second hole 11b. Finally, the fastening member 12 is rotated to fasten and secure the ceiling board installation aid 10 to the first ceiling board 61.

[0079] Next, the worker attaches the ceiling board installation aid 20A (first ceiling board installation aid) to another joist 50A (step S202 in Figure 7). The other joist 50A to which the ceiling board installation aid 20A is attached is the joist to which the other end of the second ceiling board 62 is fixed when one end of the second ceiling board 62 is positioned adjacent to the end of the already installed first ceiling board 61, as shown in Figure 8.

[0080] Next, the worker places one end of the second ceiling board 62 on the ceiling board holding portion 18 of the ceiling board installation aid 10 (second ceiling board installation aid) that was locked in step S201 (step S203 in Figure 7). Then, the worker moves the ceiling board mounting portion 25 of the ceiling board installation aid 20A (first ceiling board installation aid) to the retracted position shown in Figure 3D (step S204 in Figure 7).

[0081] As described above, with one end of the second ceiling board 62 held by the ceiling board installation aid 10, the worker presses the other end of the second ceiling board 62 against the other furring strip 50A from below (step S205 in Figure 7). Once the worker determines that the other end of the second ceiling board 62 is positioned correctly (the position when installed) on the underside of the other furring strip 50A, the worker rotates the ceiling board mounting section 25 to the usage position shown in Figure 3B to support the other end of the second ceiling board 62 from below (step S206 in Figure 7).

[0082] After supporting the other end of the second ceiling board 62 with the ceiling board installation aid 20A, the worker fixes the second ceiling board 62 in the designated position with fasteners such as screws. Following these steps, the installation of the second ceiling board 62 shown in Figure 7 is completed.

[0083] Once the installation of the second ceiling board 62 is complete, the worker removes the ceiling board installation aid 10 (second ceiling board installation aid) that was secured in step S201 from the head of the fastening member 12, and removes the ceiling board installation aid 20A (first ceiling board installation aid) that was hooked onto the other furring joist 50A in step S202 from the other furring joist 50A.

[0084] Furthermore, if the worker loosened the fastening member 12 in a position suitable for fixing the ceiling board installation aid 10 when performing step S201, to the point where it was not fully fastened, the worker will then fully fasten the fastening member 12.

[0085] In Figure 7, the case in which the second ceiling board 62 is installed using both the ceiling board installation aid 10 (second ceiling board installation aid) and the ceiling board installation aid 20A (first ceiling board installation aid) is described, but the method is not limited to this. The second ceiling board 62 may be installed using only the ceiling board installation aid 10 (second ceiling board installation aid) and without using the ceiling board installation aid 20A (first ceiling board installation aid). In that case, steps S202 and S204 in Figure 7 may not be performed, and instead of performing step S206, the worker may install the second ceiling board 62 by pressing it against the other joists 50A with their own hands.

[0086] As described above, this embodiment is a ceiling board installation aid 10 to be attached to a first ceiling board 61 fixed to the joists 50 of the ceiling 3 of a building, comprising a locking portion 15 that is attached to the first ceiling board 61 by locking onto the head of a fastening member 12 that fixes the first ceiling board 61 to the joists 50, and a ceiling board holding portion 18 that supports the second ceiling board 62, which is positioned adjacent to the end of the first ceiling board 61, from below, wherein the locking portion 15 fastens The locking hole 11 is formed by connecting in plane a first hole 11a through which the head of the member 12 can pass vertically and a second hole 11b through which the head cannot pass vertically, or a locking elongated hole 11d through which the shaft of the fastening member 12 cannot pass vertically, with one end of the locking elongated hole 11d terminating inside the locking portion 15 in a plan view and the other end extending to the outer edge of the locking portion 15 in a plan view. By adopting such a configuration, the worker can remove the ceiling board installation aid 10 from the first ceiling board 61 without completely removing the fastening member 12 that locks the ceiling board installation aid 10 from the first ceiling board 61, by either allowing the head of the fastening member 12 to pass through the first hole 11a or guiding the shaft of the fastening member 12 to the outside of the locking portion 15 through the rear end of the locking elongated hole 11d. Therefore, the workability when removing the ceiling board installation aid 10 from the first ceiling board 61 can be improved.

[0087] Furthermore, in this embodiment, the second hole 11b is configured to be located closer to the ceiling board holding portion 18 than the first hole 11a in the locking hole 11. By adopting this configuration, when the second ceiling board 62 is inserted from the front into the space between the ceiling board holding portion 18 and the furring strip 50, even if the ceiling board installation aid 10 is pushed backward by the second ceiling board 62, the fastening member 12 can contact the front end of the second hole 11b and remain inside the second hole 11b. Therefore, it is possible to effectively prevent the head of the fastening member 12 from passing through the first hole 11a and causing the ceiling board installation aid 10 to come off.

[0088] Furthermore, in this embodiment, the locking holes 11 are configured to be arranged in a line in the direction (front-to-back direction) connecting the locking portion 15 and the ceiling board holding portion 18. By adopting this configuration, multiple locking holes 11 can be used depending on the situation in which they are used. For example, if the ceiling board installation aid 10 is fixed to the front locking hole 11 that is closer to the ceiling board holding portion 18, the force with which the ceiling board holding portion 18 holds the second ceiling board 62 can be made more stable. On the other hand, if the ceiling board installation aid 10 is fixed to the rear locking hole 11 that is further away from the ceiling board holding portion 18, the ceiling board installation aid 10 can be rotated 180 degrees around the axis of the second hole portion 11b, thereby moving the ceiling board holding portion 18 farther back from the second ceiling board 62. Therefore, when fastening the surface of the second ceiling board 62 covered by the ceiling board holding portion 18 with a fastening member, it is possible to effectively prevent adjacent ceiling board installation aids 10 from interfering with the work.

[0089] Furthermore, in this embodiment, the surface of the ceiling board holding portion 18 that supports the second ceiling board 62 and the surface of the locking portion 15 that contacts the first ceiling board 61 are configured to be substantially parallel. By adopting this configuration, the entire ceiling board installation aid 10 has a flat shape, making it compact and highly portable.

[0090] Furthermore, in this embodiment, the edge 17 of the ceiling board holder 18 opposite to the locking portion 15 is configured to have a convex shape in plan view, with the central portion protruding toward the opposite side of the locking portion 15. By adopting this configuration, when inserting the second ceiling board 62 into the space between the ceiling board holder 18 and the ceiling joist 50 from the front (left direction in Figure 2B), the contact length between the end of the second ceiling board 62 and the edge 17 of the ceiling board holder 18 can be shortened, making it less likely to get caught. Therefore, the workability when installing the second ceiling board 62 can be improved.

[0091] Furthermore, the ceiling board installation aids 20A and 20B (first ceiling board installation aids) according to this embodiment include a hooking portion 21 that is hooked onto the joists 50 of the building's ceiling 3 from above, a hooking base portion 24 that extends horizontally from the lower part of the hooking portion 21 away from the joists 50 when the hooking portion 21 is installed on the joists 50, and a ceiling board mounting portion 25 that is located below the lower surface of the joists 50, extends parallel to the hooking base portion 24 and is movably mounted relative to the hooking base portion 24. The ceiling board mounting portion 25 is configured to be relatively movable relative to the hooking base portion 24 between a working position that extends beyond the joists 50 from the hooking base portion 24 and a retracted position that extends from the hooking base portion 24 to the opposite side of the joists 50 when the hooking portion 21 is installed on the joists 50. By adopting this configuration, the placement of the ceiling board mounting section 25 does not become an obstacle when attaching the ceiling board installation aids 20A and 20B to the ceiling joists 50. Therefore, the work efficiency when installing ceiling boards can be improved.

[0092] Furthermore, in this embodiment, the fastening portion 21 is configured to have a top plate 23 that covers the joist 50 from above, a long hanging piece 22a that extends downward from one end of the top plate 23 along one side 51 of the joist 50 and connects to the fastening base 24, and a short hanging piece 22c that extends downward from the other end of the top plate 23 along the other side 52 of the joist 50 and has a shorter vertical length than the long hanging piece 22a. By adopting this configuration, the ceiling board installation aids 20A and 20B can be stably fastened to the square steel joist 50 having a rectangular cross-sectional shape by placing the fastening portion 21 over the joist 50 from above.

[0093] Furthermore, in this embodiment, the short hanging piece 22c is configured to extend downwards toward the other side surface 52 of the ceiling joist 50. By adopting this configuration, the lower end of the short hanging piece 22c can firmly contact the other side surface 52 of the ceiling joist 50, thereby firmly fixing the fastening portion 21 to the ceiling joist 50.

[0094] Furthermore, in this embodiment, the ceiling joist 50 has a recess 51a on one side surface 51, and the long hanging piece 22a is configured to have a claw portion 22b that engages with the recess 51a. By adopting this configuration, the hook portion 21 of the ceiling board installation aid 20A can be firmly fixed to the ceiling joist 50. Therefore, displacement of the ceiling board installation aid 20A and the ceiling board relative to the ceiling joist 50 can be effectively suppressed. In particular, vertical displacement of the ceiling board installation aid 20A relative to the ceiling joist 50 can be effectively suppressed.

[0095] Furthermore, in this embodiment, the ceiling joist 50 has an opening 53b on its upper surface, and the top plate 23 is configured to have a claw portion 23b that engages with the opening 53b. By adopting this configuration, the hook portion 21 of the ceiling board installation aid 20B can be firmly fixed to the ceiling joist 50. Therefore, displacement of the ceiling board installation aid 20B and the ceiling board relative to the ceiling joist 50 can be effectively suppressed. In particular, displacement of the ceiling board installation aid 20B in the front-rear direction relative to the ceiling joist 50 can be effectively suppressed.

[0096] Furthermore, in this embodiment, a magnet 23a is positioned on the top of the top plate 23. By adopting this configuration, when the ceiling board installation aid 20A is not in use, the latching part 21 can be held in place by the attractive force of the magnet 23a. Therefore, no storage space is required when the ceiling board installation aid 20A is not in use. In addition, when the latching part 21 is latched to the steel joist 50 during use, the attractive force of the magnet 23a can further firmly secure the latching part 21 to the joist 50.

[0097] Furthermore, the ceiling board installation method according to this embodiment is configured to include hooking the fastening portion 21 of the ceiling board installation aids 20A and 20B onto the joists 50 from above, moving the ceiling board mounting portion 25 to a retracted position, pressing the end of the ceiling board against the joists 50 from below, and moving the ceiling board mounting portion 25 to a working position to support the end of the ceiling board from below. By adopting such a configuration, the position of the ceiling board mounting portion 25 does not become an obstacle when hooking the ceiling board installation aids 20A and 20B onto the joists 50. Therefore, the workability when installing the ceiling board can be improved.

[0098] Furthermore, the method for installing ceiling boards according to this embodiment includes: locking the locking portion 15 of the ceiling board installation aid 10 onto the head of the fastening member 12 for fixing the first ceiling board 61 which is already fixed to the furring strip 50; hooking the ceiling board installation aid 20A onto another furring strip 50A; placing the end of the second ceiling board 62 on the ceiling board holding portion 18 of the ceiling board installation aid 10; moving the ceiling board mounting portion 25 of the ceiling board installation aid 20A to a retracted position; pressing the end of the second ceiling board 62 against another furring strip 50A from below; and moving the ceiling board mounting portion 25 to a working position to support the end of the second ceiling board 62 from below. By adopting such a configuration, the second and subsequent ceiling boards can be easily installed by a single worker.

[0099] Furthermore, the ceiling board installation method according to this embodiment is configured to include: locking the locking portion 15 of the ceiling board installation aid 10 onto the head of a fastening member 12 that is not fully fastened, which is used to fix the first ceiling board 61 that is already fixed to the furring joists 50; positioning the end of the second ceiling board 62 on the ceiling board holding portion 18 of the ceiling board installation aid 10; pressing the end of the second ceiling board 62 against another furring joist 50A from below; removing the ceiling board installation aid 10; and fully fastening the fastening member 12 that is not fully fastened. By adopting such a configuration, the second and subsequent ceiling boards can be easily installed by a single worker.

[0100] Furthermore, the method for installing ceiling boards according to this embodiment includes: locking the locking portion 15 of the ceiling board installation aid 10 onto the head of a fastening member 12 that is not fully fastened, which is used to fix the first ceiling board 61 that is already fixed to the furring joist 50; hooking the ceiling board installation aid 20A onto another furring joist 50A; positioning the end of the second ceiling board 62 on the ceiling board holding portion 18 of the ceiling board installation aid 10; moving the ceiling board mounting portion 25 of the ceiling board installation aid 20A to a retracted position; pressing the end of the second ceiling board 62 against another furring joist 50A from below; moving the ceiling board mounting portion 25 to a working position to support the end of the second ceiling board 62 from below; removing the ceiling board installation aid 10; and fully fastening the fastening member 12 that is not fully fastened. By adopting such a configuration, the second and subsequent ceiling boards can be easily installed by a single worker.

[0101] While this disclosure has been described based on the drawings and embodiments, it should be noted that those skilled in the art will find it easy to make various modifications or alterations based on this disclosure. Therefore, it should be noted that these modifications or alterations fall within the scope of the present invention. For example, the functions included in each component can be rearranged in a logically consistent manner, and multiple components can be combined into one or separated.

[0102] For example, in this embodiment, the beam member 2 and the ceiling joist 50 are connected via vibration-damping suspension member 5 and ceiling joist support 6, but the embodiment is not limited to this configuration, and some connecting members may be omitted or replaced with other connecting members.

[0103] Furthermore, in this embodiment, the ceiling board mounting portion 25 of the ceiling board installation aids 20A and 20B is configured to switch between the working position and the retracted position by rotating it around the pivot shaft member 26, but the embodiment is not limited to this. The ceiling board mounting portion 25 may also be configured to switch between the working position and the retracted position by translating it, for example, in the front-rear direction relative to the latching base portion 24. [Explanation of Symbols]

[0104] 1. Building ceiling structure 2 Beam members 3 Ceiling 5. Vibration-damping suspension members 8 Floor support members 9 Wall 10,10B Ceiling board installation aid (Second ceiling board installation aid) 10e Rib 11. Sectoral hole 11a First hole 11b Second hole 11c connector 11d Locking elongated hole 12 Fastening members 13 R end face 15 Locking part 16 Widening section 17 Edge 18 Ceiling board retaining part 18a center opening 20A, 20B Ceiling board installation aid (First ceiling board installation aid) 21 Latch part 22 Movement Control Department 22a long hanging piece 22b Claw part 22c short hanging piece 23 Top plate 23a Magnet 23b Claw part 24 Latch base 25 Ceiling board mounting section 26. Rotating shaft member 26a Bolt 26b Nut 50 veranda 50A Other ceiling joists 51 One side 51a recess 52 Other Aspects 52a Recess 53 Top surface 53a Recess 53b opening 54 Bottom 54a Recess 61. First ceiling board 62 Second ceiling board

Claims

1. A ceiling board installation aid that is attached to a first ceiling board fixed to the ceiling joists of a building, A locking portion that is attached to the first ceiling board by engaging with the head of a fastening member that fixes the first ceiling board to the furring strip, A ceiling board holding portion that supports a second ceiling board positioned adjacent to the end of the first ceiling board from below, Equipped with, The aforementioned locking portion is, A locking hole in which a first hole through which the head of the fastening member can pass in the vertical direction and a second hole through which the head cannot pass in the vertical direction but the shaft of the fastening member can pass are connected in plane, or A locking slot through which the head cannot pass in the vertical direction and through which the shaft portion of the fastening member can pass, wherein one end of the locking slot terminates inside the locking portion in a plan view and the other end extends to the outer edge of the locking portion in a plan view. A ceiling board installation aid that has the following features.

2. The ceiling board installation aid according to claim 1, wherein the second hole is located in the locking hole closer to the ceiling board holding portion than the first hole.

3. The ceiling board installation aid according to claim 1 or 2, wherein the locking holes are arranged in a plurality in the direction connecting the locking portion and the ceiling board holding portion.

4. The ceiling board installation aid according to claim 1 or 2, wherein the surface of the ceiling board holding portion that supports the second ceiling board and the surface of the locking portion that contacts the first ceiling board are formed to be substantially parallel.

5. The ceiling board installation aid according to claim 1 or 2, wherein the edge of the ceiling board holding portion opposite to the locking portion has a convex shape in plan view, with the central portion protruding toward the opposite side of the locking portion.

6. A fastening part that is attached to the ceiling joists of the building from above, When the aforementioned fastening portion is installed on the ceiling joist, A latching base extending horizontally from the lower part of the latching portion, A ceiling board mounting portion is located below the lower surface of the aforementioned joist, extends parallel to the aforementioned fastening base, and is movably mounted relative to the aforementioned fastening base. Equipped with, The ceiling board mounting portion is a ceiling board installation aid that, when the fastening portion is installed on the furring joist, is movable relative to the fastening base between a working position extending beyond the furring joist from the fastening base and a retracted position extending away from the fastening base on the opposite side from the furring joist.

7. The ceiling board installation aid according to claim 6, wherein the fastening portion comprises a top plate that covers the joist from above, a long hanging piece extending downward from one end of the top plate along one side of the joist and connected to the fastening base, and a short hanging piece extending downward from the other end of the top plate along the other side of the joist, having a shorter vertical length than the long hanging piece.

8. The ceiling board installation aid according to claim 7, wherein the short hanging piece extends downward in a direction toward the other side of the ceiling joist.

9. The aforementioned ceiling joist has an opening or recess on one of its sides, The ceiling board installation aid according to claim 7 or 8, wherein the long hanging piece has a claw portion that engages with the opening or recess.

10. The aforementioned ceiling joist has an opening or recess on its upper surface, The ceiling board installation aid according to claim 7 or 8, wherein the top plate has a claw portion that engages with the opening or recess.

11. The ceiling board installation aid according to claim 7 or 8, wherein a magnet is arranged on the upper part of the top plate.

12. This is a method for installing ceiling boards. The fastening portion of the ceiling board installation aid described in claim 6 is fastened to the joist from above, Moving the ceiling board mounting section to the retracted position, Pressing the end of the ceiling board against the joist from below, The ceiling board mounting portion is moved to the usage position to support the end of the ceiling board from below. Construction methods, including those mentioned above.

13. This is a method for installing ceiling boards. The locking portion of the ceiling board installation aid described in claim 1 is to be locked to the head of a fastening member for fixing the first ceiling board which is already fixed to the ceiling joist, The ceiling board installation aid described in claim 6 is to be attached to another joist, The end of the second ceiling board is placed on the ceiling board holding portion of the ceiling board installation aid described in claim 1, Moving the ceiling board mounting portion of the ceiling board installation aid described in claim 6 to the retracted position, Pressing the end of the second ceiling board against the other joist from below, The ceiling board mounting portion is moved to the position of use to support the end of the second ceiling board from below. Construction methods, including those mentioned above.

14. This is a method for installing ceiling boards. The locking portion of the ceiling board installation aid described in claim 1 is to be locked onto the head of a fastening member that is not fully fastened, which is used to fasten the first ceiling board that has already been fixed to the joist, The end of the second ceiling board is placed on the ceiling board holding portion of the ceiling board installation aid described in claim 1, Pressing the end of the second ceiling board against the other joist from below, Removing the ceiling board installation aid described in claim 1, To fully fasten the fastening member that is not fully fastened Construction methods, including those mentioned above.

15. This is a method for installing ceiling boards. The locking portion of the ceiling board installation aid described in claim 1 is to be locked onto the head of a fastening member that is not fully fastened, which is used to fasten the first ceiling board that has already been fixed to the joist, The ceiling board installation aid described in claim 6 is to be attached to another joist, The end of the second ceiling board is placed on the ceiling board holding portion of the ceiling board installation aid described in claim 1, Moving the ceiling board mounting portion of the ceiling board installation aid described in claim 6 to the retracted position, Pressing the end of the second ceiling board against the other joist from below, The ceiling board mounting section is moved to the position of use to support the end of the second ceiling board from below, Removing the ceiling board installation aid described in claim 1, To fully fasten the fastening member that is not fully fastened Construction methods, including those mentioned above.

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