JPH0634982Y2 - Ceiling frame joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a structure for joining a main bar and a cross bar in a system ceiling configured by assembling the main bar and the cross bar in a grid pattern. .

[Prior Art] Generally, as shown in FIG. 4, the structure of the system ceiling is mainly composed of a main bar 1 and a cross bar 2 each having a substantially inverted T-shaped cross section, and the cross bar 2 is joined to the main bar 1 at a right angle. Then, the ceiling frame is constructed in a grid pattern. This ceiling frame is hung by suspending the main bar 1 with a hanger 3 and a hanging bolt 4 on an upper slab. Inside the ceiling frame, which is surrounded by the main bar 1 and the cross bar 2, the ceiling material 5 and the lighting equipment 6 are provided.
Is mounted on the flange 7 of the main bar 1 and the cross bar 2 as shown in FIG. The main bar 1 and the cross bar 2 are formed by bending a thin steel plate. The joint between the main bar 1 and the cross bar 2 is constructed as shown in FIGS. 6 and 7. On the side surface of the main bar 1, a receiving portion 8 ', a retaining portion 9 and a rotation preventing portion 10 are formed by cutting and raising, and an L-shaped claw portion 11 at both ends of the crossbar 2 has a rotation preventing hole 13 and a retaining hole. A stopper hole 14 is provided, and the claw portion 11 is inserted into the receiving portion 8 ′ so that the rotation stopper portion 10 is locked in the rotation stopper hole 13 and the stopper portion 9 is locked in the stopper hole 14.

[Problems to be Solved by the Invention] As described above, the main bar 1 and the cross bar 2 are inserted into the receiving portion 8'of the claw portion 11 and the rotation stopping hole of the rotation stopping portion 10.
The main bar 1 and the cross bar 2 are joined even if a slight pulling force or bending moment is applied, because they are joined to each other by engaging with 13 and engaging with the retaining hole 14 of the retaining portion 9. Although it does not come off, the receiving part 8'having an L-shaped cross section formed by cutting and raising when a large tensile force or bending moment is applied due to an earthquake or the like deforms as shown in FIG. 7, and finally from the main bar 1. The crossbar 2 may come off. That is, when a load larger than the strength of the receiving portion 8'is applied, the crossbar 2 comes off. Further, even when a load smaller than the strength of the receiving portion 8'applies, the receiving portion 8'deforms, and when the load is repeated, the deformation gradually progresses, and eventually the crossbar 2 comes off. If the receiving portion 8'has a strong structure and is made of a rigid joint structure, energy such as vibration is not absorbed at the joint part, and the vibration is transmitted as it is, and weak parts such as lighting equipment other than the ceiling frame may be damaged. There is.

The present invention has been made in view of the above-mentioned points, and the purpose of the present invention is to prevent the main bar and the cross bar from being disconnected even when a large load such as an earthquake is applied, and to prevent the main bar from crossing. It is an object of the present invention to provide a structure of a joint portion of a ceiling frame that can protect a lighting fixture or the like by preventing vibration energy from being absorbed at a joint portion with a bar and being transmitted to a weak portion such as a lighting fixture.

[Means for Solving the Problems] In order to achieve the above object, the structure of the joint portion of the ceiling frame of the present invention is an L-shaped structure in which the main bar 1 and the cross bar 2 orthogonal to the main bar 1 are arranged in a grid pattern. In the case where the claw portions 11 bent to be provided at both ends of the cross bar 2 and the claw portions 11 are inserted and joined to the receiving portions 8 provided on the side surface of the main bar 1, the receiving portions 8 for receiving the claw portions 11 face each other. The arch-shaped engaging portion 8a in which the portions are connected and the pair of locking portions 8b in which the facing portions are separated from each other
It consisted of and.

[Operation] The engaging portion 8a of the receiving portion 8 even when a large load such as an earthquake is applied
(The strong part) and the claw part 11 are not disengaged from each other, and the locking part 8b of the receiving part 8 (the weak part)
It is possible to prevent the vibration energy from being absorbed and the vibration force being transmitted by the joining of the claw portion 11 and the claw portion 11.

[Embodiment] First, the embodiment shown in FIG. 1 will be described. The main bar 1 is formed by bending a metal plate such as a thin steel plate to have a substantially inverted T-shaped cross section, and has a horizontal flange 7 at the bottom. On the side surface of the main bar 1, a receiving portion 8, a retaining portion 9 and a rotation preventing portion 10 are formed by cutting and raising. The receiving portion 8 has an arched engagement portion 8a and an L-shaped cutout 15 provided therebetween.
The engaging portion 8a is a portion having a strong joint strength, and the engaging portion 8b is a portion having a weak joint strength. The locking portion 8b, which is a portion having a weak joint strength, has a structure in which when the maximum load is applied, the engaging portion 8b is deformed so that the following claw portion 11 is disengaged, and the engaging portion 8a having a strong joint strength.
Has a structure in which when the maximum load is applied, it breaks and the claw portion 11 comes off. The strength of the engaging part 8a, which is the part with strong joint strength, is sufficient to withstand the load acting on that part in the event of a large earthquake, and the strength of the locking part 8b, which is the part with weak joint strength, is the part in the case of a medium earthquake. It is preferable to have a strength that can withstand the load acting on (the response acceleration of the system ceiling during a large earthquake and a medium earthquake is set arbitrarily according to the conditions of the building, etc.). The crossbar 2 is formed by bending a metal plate such as a thin steel plate to have a substantially inverted T-shaped cross section, and has a horizontal flange 7 at the bottom. L-shaped claw from the end of the crossbar 2
11, the ribs 16 are provided on the claw portion 11 along the claw portion 11, and the rotation stop hole 13 and the retaining hole 14 are provided at the tip of the claw portion 11. This main bar 1 and cross bar 2
Are arranged in a grid like the conventional example, and are assembled by joining the both ends of the main bar 1 and the cross bar 2.
The claw portion 11 at the end portion of the crossbar 2 is inserted into the engaging portion 8a and the locking portion 8b of the receiving portion 8, the retaining portion 9 is retained in the retaining hole 14, and the rotation stopper portion 10 is in the rotation stopper hole. Locked at 13. In this way, the main bar 1 and the cross bar 2 are joined, and the locking portion 8b is deformed by the notch 15 against vibration and horizontal force such as an earthquake, while the locking portion 8a is attached to the claw portion 11. It is firmly bonded and will not come off. Since the locking portion 8b is deformed by the vibration and the horizontal force, energy such as vibration is attenuated, and the horizontal force is not transmitted to the grid next to the ceiling frame. Further, it is possible to follow the displacement of the ceiling due to the displacement of the layers of the building to some extent. Moreover, since the strength of the engaging portion 8a is set to be larger than the acting force, the engaging portion 8a does not come off and the original state can be restored. In other words, if the main bar 1 and the cross bar 2 are joined (rigid joint) only with a strong portion without a weak portion like the locking portion 8b of the above embodiment, the grid of the ceiling frame is Since horizontal force is transmitted as it is inside the building, it becomes a very large force at the end, which may damage weak parts such as lighting equipment.In addition, against the interlayer displacement of the building, the ceiling part of the partition is installed. Although the displacement will affect the entire ceiling, such a situation can be prevented by providing the engaging portion 8a having a strong joint strength and the locking portion 8b having a weak joint strength as described above and joining.

FIG. 2 shows another embodiment, in which the engaging portion 8a and the locking portion 8b are completely separated. This embodiment also has the same effect as the above embodiment. Further, FIG. 3 shows another embodiment, in which a substantially lateral V-shaped notch 15 is provided to form a locking portion 8b. That is, in the case of the embodiment of FIG. 1, if the notch 15 is U-shaped, the deformation progresses rapidly if a similar load is repeated, but as in the present embodiment, the notch 15 is laterally V-shaped. If it is, the deformation does not proceed unless a larger load than before is applied. In other words, the joint strength gradually increases as the engaging portion 8b approaches the engaging portion 8a.

[Effects of the Invention] As described above, according to the present invention, the receiving portion for receiving the claw portion is composed of the arch-shaped engaging portion where the facing portions are connected and the pair of locking portions where the facing portions are separated from each other. Even if a large load is applied to the receiving part, the engagement part of the receiving part (the part with strong bonding strength) and the claw part will not be disengaged from each other, and the catching part of the receiving part (the part with weak bonding strength) and the claw It is possible to prevent the energy such as vibration from being absorbed by the joint of the parts and prevent the transmission of the vibration force, and the joint between the main bar and the cross bar does not come off even if an earthquake etc. occurs, and strong vibration to the lighting equipment etc. Even if it is not transmitted, there is no risk of damage to lighting equipment.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIGS. 2 and 3 are perspective views of other embodiments of the same, FIG. 4 is a perspective view showing the entire system ceiling of the same, and FIG. FIG. 6 is a partially exploded perspective view showing a conventional example, and FIG. 7 is a perspective view showing a defect of the conventional example, in which a ceiling plate is being supported.
Is a main bar, 2 is a crosser, 8 is a receiving portion, 8a is an engaging portion, 8b is a locking portion, and 11 is a claw portion.

Claims (1)

[Scope of utility model registration request] 1. A main bar and a cross bar orthogonal to the main bar are arranged in a grid pattern, and claw portions bent in an L shape are provided at both ends of the cross bar and at a receiving portion provided on a side surface of the main bar. In the structure of the joint portion of the ceiling frame in which the claw portions are inserted and coupled, the receiving portion that receives the claw portion is configured by an arch-shaped engaging portion in which the facing portions are connected and a pair of locking portions in which the facing portions are separated from each other. The structure of the joint part of the ceiling frame.