A seismic bracket and installation method for suspended lighting equipment

Abstract

The present invention discloses an earthquake-resistant bracket for suspended lighting equipment and an installation method, comprising a long hanger connected to a floor slab, a short hanger connected to the lighting equipment, and a main keel and a secondary keel respectively connected to the long hanger and the short hanger; the main keel and the secondary keel are connected to each other; further, diagonal supports are connected or not connected between adjacent long hangers through diagonal support connectors to form a frame structure that works together, thereby increasing the lateral rigidity of the lighting equipment, making it less likely to be damaged by torsion and shearing, and avoiding local buckling at the connection parts of the components. The keel has strong rigidity, which further enhances the overall stability of the bracket, and effectively avoids large lateral displacement of the lighting equipment under the action of an earthquake, collision with other structures, and damage caused by insufficient strength of the lighting equipment itself.

Description

Technical Field

[0001] The invention relates to an earthquake-resistant bracket for lighting equipment, which can be widely used in industrial plants and civil buildings. Background Art

[0002] Suspended ceilings are widely used in the decoration of modern buildings due to their advantages of beauty, sound absorption, thermal insulation, etc. However, due to their special craftsmanship, the lighting equipment in the room cannot be directly fixed on the ceiling under this decoration form, so suspended lighting equipment is mostly used in such buildings; however, traditional suspended lighting equipment has not been specially designed for the seismic performance of the lighting equipment, and most of them only use two hangers to simply connect the lighting equipment to the connectors on the floor. This connection results in low lateral stiffness and weak strength of the lighting equipment, which will cause large lateral displacement when encountering earthquakes. As an indispensable lighting tool in buildings, lighting equipment is often densely installed in buildings. Several lighting equipment will be installed in one room. Large lateral displacement of a large number of lighting equipment can easily cause collision damage to the suspended ceiling itself and the pipes, lines, air conditioners and other equipment installed in the suspended ceiling. At the same time, the densely arranged lighting equipment will fall due to its own structural damage, which will also cause a certain degree of harm to the safety of people and property equipment in the room. Summary of the invention

[0003] The object of the present invention is to solve the above-mentioned problems and to provide a seismic-resistant bracket for lighting equipment with oblique supports, which enhances the self-strength of the structure by arranging main purlins and secondary purlins between long hangers and short hangers, so that the structure can withstand certain earthquake effects without being destroyed; the short hangers connected to the lighting equipment can adjust the distance within a certain range; in another scheme, oblique supports are arranged between the long hangers, so that the bracket as a whole has strong lateral stiffness and torsional stiffness in all directions, making the bracket suitable for lighting equipment of different models.

[0004] The object of the present invention is achieved through the following technical solutions.

[0005] According to one embodiment of the present invention, a seismic bracket for a suspended lighting device comprises:

[0006] A long boom, connected to the floor slab at the top and a pair of main keels at the bottom;

[0007] A short boom with lighting equipment connected at the bottom and a secondary keel connected at the top;

[0008] Both ends of the secondary keel are fixedly connected to the main keel;

[0009] Diagonal supports are connected between adjacent long booms;

[0010] The oblique support interferes with the long hanger, so that when the center of mass and the center of rigidity of the structure do not completely coincide, the resistance to torsion of the long hanger is borne by the axial force of the oblique support; and the lateral stiffness K1 of the long hanger, short hanger, main keel, secondary keel and oblique support satisfies:

[0011]

[0012] Where, E is the elastic modulus of the long hanger, short hanger, main keel, secondary keel and diagonal support; I is the section inertia moment of the hanger; a is the vertical distance from the upper end of the diagonal support to the upper end of the long hanger; l1 is the length of the long hanger; l2 is the length of the short hanger; A is the cross-sectional area of ​​the hanger; d is the diameter of the hanger; θ is the inclination angle of the diagonal support.

[0013] For this technical solution, a further preferred solution is:

[0014] Preferably, adjacent oblique supports have the same inclination direction and different inclination angles.

[0015] Preferably, the oblique supporting connecting member includes an arch member and a groove member, the groove member is fixed on the inner surface of the arch member; open-loop grooves are symmetrically provided at both ends of the arch member, the open-loop grooves are opened at the same distance above and below the arc plate, and the long suspension rod passes vertically through the open-loop grooves.

[0016] Preferably, the thickness of the middle section of the arched member is greater than the thickness of the extending sections on both sides, and the thickness of the extending ends on both sides gradually becomes thinner.

[0017] Preferably, the groove-shaped member is a rectangular groove structure, and notches are opened on two frames of the groove, and the notches are clamped between the threads of the oblique support.

[0018] Furthermore, the present invention provides a method for installing the seismic support using the first embodiment, comprising:

[0019] Two pairs of long hangers are respectively connected to a pair of main keels, and a pair of short hangers are connected to a secondary keel; the secondary keel is vertically erected and connected to a pair of main keels; the long hangers are passed through the open-loop grooves of the bow-shaped components of the oblique support connecting pieces, and are tensioned under the outward elastic force of the bow-shaped components; the oblique supports pass through the groove-shaped components of the oblique support connecting pieces, and the oblique supports are connected to adjacent long hangers, and the adjacent oblique supports have the same inclination direction.

[0020] According to another embodiment of the present invention, an earthquake-resistant bracket for a suspended lighting device includes a long suspension rod connected to a floor, a short suspension rod connected to the lighting device, and a main keel and a secondary keel respectively connected to the long suspension rod and the short suspension rod; the main keel and the secondary keel are connected to each other;

[0021] Among them, when the center of mass and the center of rigidity of the structure do not completely coincide, the lateral stiffness K2 of the long hanger, short hanger, main keel and secondary keel satisfies:

[0022]

[0023] Where, E is the elastic modulus of the long hanger, short hanger, main keel, secondary keel and diagonal support; I is the section moment of inertia of the hanger; l1 is the length of the long hanger; l2 is the length of the short hanger.

[0024] In the above technical solution, a further preferred solution is:

[0025] Preferably, the secondary keel is arranged along the length direction of the lighting device, and a pair of short suspension rods are vertically connected to the secondary keel and the lighting device.

[0026] Preferably, a pair of main purlins are arranged in parallel along the width direction of the lighting device, and two pairs of long suspension rods are respectively vertically connected to the main purlins at one end and connected to the floor slab at the other end.

[0027] Preferably, the secondary keel is vertically mounted on a pair of main keels with the slots facing outwards and connected by bolts; the length of the secondary keel is greater than that of the main keel.

[0028] Preferably, the installation width of the pair of long hangers on the main keel is smaller than the installation width of the pair of short hangers on the secondary keel.

[0029] The present invention adopts the above technical solution, which has the following beneficial effects:

[0030] 1. By adding oblique supports to adjacent long hangers, the upper side of the bracket is formed into a whole, forming a frame-like structure. Such a structure has strong lateral stiffness and can withstand earthquakes in all directions without large lateral deformation. When subjected to earthquakes, each component is deformed as a whole; when a single component is damaged, the whole still has a certain bearing capacity, avoiding the situation where the structure as a whole cannot withstand the load due to local damage of the component.

[0031] 2. When the bracket is subjected to earthquake action, since the center of mass and the center of rigidity of the structure may not completely coincide, the inertial force along the center of mass and the member restoring force along the center of rigidity will form a torque around the center of rigidity, causing the member to produce horizontal torsional coupled vibration; in the test, it was also found that the member will produce horizontal torsional vibration in the absence of oblique support, which will cause a large shear force in the long hanger. This force mode makes the long hanger more easily damaged. By adding oblique supports to adjacent long hangers, the overall torsional stiffness of the member is enhanced. When torsion occurs, the resistance of the member is also converted into the axial force of the oblique support, which is directly transmitted to the end of the long hanger through the oblique support connector. This force form can make better use of the material.

[0032] 3. By setting the main keel and the secondary keel at the lower end of the long suspension rod, the overall rigidity of the bracket is further strengthened. The main keel and the secondary keel have large rigidity and will not deform or displace significantly. They can restrain the lower end of the long suspension rod and strengthen the stability between the long suspension rods. At the same time, they also ensure the stability of the lighting equipment connected under the secondary keel.

[0033] 4. The lighting equipment is connected to the secondary keel through a short suspension rod. At the same time, the secondary keel is provided with short suspension rod connection holes at different positions, so that when installing lighting equipment of different sizes, there is no need to replace the bracket. You only need to adjust the short suspension rod on the secondary keel to the appropriate position. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute an improper limitation of the present invention. In the drawings:

[0035] Figure 1 is a three-dimensional diagram of the overall structure of embodiment 1 of the present invention;

[0036] Figure 2 is a front view of embodiment 1 of the present invention;

[0037] Figure 3 is a side view of embodiment 1 of the present invention;

[0038] Figure 4 It is the detailed drawing of the connection between the primary and secondary keels;

[0039] Figure 5 This is a detailed diagram of the oblique support connection of Example 1;

[0040] Figure 6 is a three-dimensional diagram of the overall structure of embodiment 2 of the present invention;

[0041] Figure 7 is a front view of embodiment 2 of the present invention;

[0042] Figure 8 It is a side view of embodiment 2 of the present invention.

[0043] Among them, 1 is the floor slab; 2 is the long hanger; 3 is the main purlin; 4 is the secondary purlin; 5 is the short hanger; 6 is the lighting equipment; 7 is the diagonal support connector; 8 is the diagonal support; 9 is the bow-shaped member; 10 is the trough-shaped member; 11 and 12 are connecting nuts; and 13 is a bolt. DETAILED DESCRIPTION

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0045] like Figure 1-3As shown, the present invention provides an implementation, which is a seismic bracket with oblique supports for suspended lighting equipment, including a long hanger 2, an oblique support 8 and an oblique support connector 7 connected to the upper frame structure of a floor 1; a short hanger 5 connected to the lighting equipment 6, and a secondary keel 4 and a main keel 3 that act as a skeleton; the top of the long hanger is connected to the floor, and the bottom is connected to a pair of main keels; the bottom of the short hanger is connected to the lighting equipment, and the top is connected to a secondary keel; both ends of the secondary keel are fixedly connected to the main keel; and the oblique supports are connected along adjacent long hangers.

[0046] The two main keels 3 are arranged in parallel along the width direction of the lighting device 6 and are separated by a certain distance. The secondary keel 4 is arranged along the length direction of the lighting device 6. A pair of short suspension rods 5 are vertically connected to the secondary keel 4 and the lighting device 6; the two ends of the secondary keel 4 are connected to the middle of the two main keels 3 by bolts.

[0047] The length of the long hanger is greater than that of the short hanger. The vertical distance between the upper end of the diagonal support and the upper end of the long hanger is consistent with the vertical distance between the lower end of the diagonal support and the lower end of the long hanger. The lengths of the main purlin and the secondary purlin must be greater than the spacing of the reserved holes in the floor slab in the corresponding direction. In order to save the purchase cost of using hangers of different sizes, it is recommended that the diameters of the long hanger, short hanger and diagonal support be consistent; the long hanger, short hanger, main purlin, secondary purlin and diagonal support are made of the same materials.

[0048] And the calculation formula of the lateral stiffness K1 of the overall structure is:

[0049]

[0050] Among them, the length l1 of the long hanger is greater than the length l2 of the short hanger, the vertical distance a from the upper end of the diagonal support to the upper end of the long hanger is consistent with the vertical distance b from the lower end of the diagonal support to the lower end of the long hanger, the inclination angle of the diagonal support to the horizontal direction is θ, and the lengths of the main keel and the secondary keel must be greater than the spacing of the reserved holes in the floor slab in the corresponding direction. The diameters of the long hanger and the short hanger are consistent and are specified as d. At this time, the cross-sectional inertia moment of the hanger is I and the cross-sectional area is A. The elastic modulus of the material used to make the long hanger, short hanger, main keel, secondary keel, and diagonal support is E.

[0051] Specifically, the long suspension rod 2 is a threaded rod, the upper end of which is fixed on the floor slab 1 , and the lower end of which is fixed to the upper flange of the main keel 3 through two nuts.

[0052] like Figure 4 As shown, the main keel 3 and the secondary keel 4 are both channel steel, wherein the main keel 3 is shorter and the secondary keel 4 is slightly longer.

[0053] There is a hole for connecting the long suspension rod 2 at the upper flanges on both sides of the main keel 3, and a bolt hole for connecting with the secondary keel 4 at the middle upper flange; a row of symmetrical holes is provided on the lower flange of the secondary keel 4, of which two holes on both sides are bolt holes for connecting with the main keel 3, and the rest are holes for connecting with the short suspension rod 5. The main keel 3 is placed horizontally with the notches facing each other, and the secondary keel 4 is vertically erected on a pair of main keels 3 with notches facing outwards. The bolt holes of the lower flange of the secondary keel 4 and the upper flange of the main keel 3 are aligned and then tightened to fix the bolts. The main keel 3 and the secondary keel 4 are connected by a single bolt so that they can produce a small reciprocating rotation along the bolt as the axis when encountering an earthquake. Since the pre-tightening force on the bolt is transmitted to the connection surface of the main keel 3 and the secondary keel 4, there will be a certain friction between the main keel 3 and the secondary keel 4. During the reciprocating rotation, the friction can consume part of the energy generated by the earthquake, playing the role of energy absorption and shock reduction. The multiple short suspension rod 5 connection holes arranged at the lower side of the secondary keel 4 allow the short suspension rod 5 to be adjusted to a suitable position according to the size of the lighting equipment, so that the bracket is compatible with different models of lighting equipment.

[0054] The installation width of the pair of long suspension rods 2 on the main keel 3 is smaller than the installation width of the pair of short suspension rods 5 on the secondary keel 4 .

[0055] With this structure, the inclination directions of adjacent oblique supports are the same but the inclination angles are different. The oblique supports between the long hangers are fixed by the oblique support connectors 7 fixed on the long hangers. During installation, prestress is applied to the oblique support connectors, and the bendable characteristics thereof are utilized to flexibly connect the long hangers. Two upper and lower oblique support connectors 7 are fixed on each long hanger 2, and the two ends of each oblique support are respectively connected to the upper oblique support connector of a long hanger and the lower oblique support connector of the long hanger adjacent to it. The end portion of the short hanger 5 with the external thread passes through the hole of the lower flange of the secondary keel 4 from the bottom and the nut is screwed on. The short hanger 5 is then fixed on the secondary keel 4, and the other end of the short hanger 5 is connected to the connector on the lighting device 6.

[0056] like Figure 5As shown, the oblique support connector 7 is composed of an arched member 9 and a grooved member 10. The grooved member 10 is fixed at the center of the middle plate of the arched member 9 and can rotate freely along an axis perpendicular to the plate. When the arched member 9 is not fixed on the long suspension rod 2, it is a straight member along the length direction. The middle part is a steel plate with a thicker cross section, but the cross section gradually becomes thinner as it extends to both sides in the length direction, and finally becomes a bendable sheet. A curved notch is opened in the middle of each of the two sheet positions. There is a rectangular notch on each of the two slots of the trough member 10. During installation, the notch of the trough member 10 is first stuck between the threads at one end of the oblique support 8, and then the bow member 9 is manually stressed to bend the sheet-like parts on both sides toward the trough member 10 until the long suspension rod 2 can be placed in the two curved notches at the same time. Then, a suitable position is selected to place the long suspension rod 2 in the two curved notches, and the stress applied to the bow member 9 is stopped. The prestress generated by the deformation of the bow member 9 itself makes it tend to open, but when it opens, the threads of the long suspension rod 2 will be stuck on the inner side of the curved notch, so that it cannot continue to deform. The bow member 9 can rotate with the long suspension rod 2 as the axis. This connection method can be approximately considered as a hinge. When subjected to earthquake action, the main stress generated by the oblique rod 8 is the axial force, which prevents it from being damaged due to shear and torsion. At the same time, this connection method allows the oblique support connector 7 to rotate, and can also avoid the phenomenon of local buckling at the connection position. The connecting components can all be installed manually, and the installation and disassembly are quick and simple, with strong practicality.

[0057] like Figure 6-8 As shown, in another embodiment provided by the present invention, a seismic bracket for lighting equipment without oblique support is used, the long suspension rod of the bracket is a smooth suspension rod, the protruding parts at both ends are provided with external threads, the lower end is fixed to the flange of the main keel 3 through a nut b12, a pair of short suspension rods 5 are fixed to the secondary keel 4 through nuts a11, and the main keel 3 and the secondary keel 4 are fixedly connected by bolts 13. The connection method of the short suspension rod, the main keel, the secondary keel of the bracket to the floor and the lamp is the same as that of embodiment 1.

[0058] The use of this structure is different from Example 1 in that, for lighter lighting equipment, the inertial force generated when subjected to an earthquake is smaller and can be directly borne by the long hanger rod and the primary and secondary keels. Simplifying the bracket components can reduce the overall cost and simplify the installation steps of the bracket, thereby achieving a more economical effect.

[0059] The calculation formula of the lateral stiffness K2 of the overall structure is:

[0060]

[0061] Among them, the length l1 of the long hanger is greater than the length l2 of the short hanger, and the lengths of the main keel and the secondary keel must be greater than the spacing of the reserved holes in the floor slab in the corresponding direction. The diameter of the long hanger and the diameter of the short hanger should be kept consistent as much as possible, which is specified as d. At this time, the cross-sectional inertia moment of the hanger is I. E is the elastic modulus of the material used to make the long hanger, short hanger, main keel, and secondary keel.

[0062] Since the oblique support between adjacent long hangers is eliminated, the single bolt connection between the main keel 3 and the secondary keel 4 will cause a smaller displacement and deformation under the influence of earthquake. However, due to the pre-tightening force of the bolt, there is a certain friction between the main keel 3 and the secondary keel 4. The friction can offset part of the energy generated by the earthquake and play a role in energy absorption and shock reduction.

[0063] The cost of installing lamps of different models is greatly saved, and the present invention is also highly practical.

[0064] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A seismic bracket for suspended lighting equipment, characterized in that: include: A long hanger, connected to the floor slab at the top and a pair of main keels at the bottom; A short boom with lighting equipment connected at the bottom and a secondary keel connected at the top; Both ends of the secondary keel are fixedly connected to the main keel; Diagonal supports are connected between adjacent long booms; Wherein, the oblique support connecting member includes an arched member and a grooved member, and the arched member can rotate with the long suspension rod as the axis; The oblique support interferes with the long hanger, so that when the center of mass and the center of rigidity of the structure do not completely coincide, the resistance to the torsion of the long hanger is borne by the axial force of the oblique support; and the lateral stiffness of the long hanger, short hanger, main keel, secondary keel and oblique support K 1Satisfy: In the formula, E is the elastic modulus of the long hanger, short hanger, main keel, secondary keel and diagonal support; I is the section moment of inertia of the suspender; a It is the vertical distance from the upper end of the diagonal support to the upper end of the long boom; l 1 is the length of the long boom; l 2 is the length of the short boom; A is the cross-sectional area of ​​the boom; d is the boom diameter; θ is the inclination angle of the diagonal support; The adjacent oblique supports have the same inclination direction but different inclination angles; The oblique supporting groove-shaped member is fixed on the inner surface of the arch-shaped member; the two ends of the arch-shaped member are symmetrically provided with open ring grooves, the open ring grooves are provided at the same distance up and down on the arc-shaped plate, and the long suspension rod passes vertically through the open ring grooves; The groove-shaped component is a rectangular groove structure, and notches are opened on the two frames of the groove, and the notches are clamped between the threads of the oblique support.

2. The earthquake-resistant bracket for suspended lighting equipment according to claim 1, characterized in that: The thickness of the middle section of the arched component is greater than the thickness of the extending sections on both sides, and the thickness of the extending ends on both sides gradually becomes thinner.

3. The earthquake-resistant bracket for suspended lighting equipment according to claim 1, characterized in that: When the center of mass and the center of rigidity of the structure do not completely coincide, the lateral stiffness of the long hanger, short hanger, main keel and secondary keel K 2. Satisfy: In the formula, E is the elastic modulus of the long hanger, short hanger, main keel, secondary keel and diagonal support; I is the section moment of inertia of the suspender; l 1 is the length of the long boom; l 2 is the length of the short boom.

4. The earthquake-resistant bracket for suspended lighting equipment according to claim 1, characterized in that: The secondary purlin is arranged along the length direction of the lighting equipment, and a pair of short hangers are vertically connected to the secondary purlin and the lighting equipment; a pair of main purlins are arranged parallel to the width direction of the lighting equipment, and two pairs of long hangers are vertically connected to the main purlin at one end and connected to the floor slab at the other end.

5. The earthquake-resistant bracket for suspended lighting equipment according to claim 1, characterized in that: The secondary keel is vertically erected on a pair of main keels with grooves facing outwards and connected by bolts; the length of the secondary keel is greater than that of the main keel.

6. The earthquake-resistant bracket for suspended lighting equipment according to claim 1, characterized in that: The installation width of a pair of long hangers on the main keel is smaller than the installation width of a pair of short hangers on the secondary keel.

7. The method for installing a seismic support according to any one of claims 1 to 6, characterized in that: Using a seismic support with oblique support, the method comprises: Connect two pairs of long suspension rods to a pair of main keels respectively, and connect a pair of short suspension rods to a secondary keel; The secondary keel is erected vertically and connected to a pair of main keels; The long suspension rod is passed through the open ring groove of the bow-shaped member of the oblique support connecting member, and is tensioned under the outward elastic force of the bow-shaped member; The oblique supports pass through the channel-shaped components of the oblique support connecting pieces, and the oblique supports are connected to adjacent long suspension rods, and the adjacent oblique supports have the same inclination direction.

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