Suspended ceiling peripheral restraining piece with built-in bidirectional compression spring and axial bearing capacity testing method

Abstract

The invention provides a suspended ceiling peripheral restraining piece with a built-in bidirectional compression spring and an axial bearing capacity testing method. The restraining piece comprises a novel fastening piece (1), a screw rod (2), a nut (3), a circular gasket (4), a compression spring (5), a square gasket (6), a lifting ring bolt (7) and a lifting ring nut (8). The restraining piece is connected with the side keel through a screw to form a main-side keel connecting node (hereinafter referred to as a side node). The invention further relates to an axial bearing capacity testing method of the side node. The constraint piece serves as a connection form of end nodes of a ceiling main keel, on one hand, end constraint of a ceiling keel component can be enhanced, the lateral stiffness of a ceiling structure under the earthquake action is enhanced, and the failure and damage conditions of side nodes are relieved; and on the other hand, the self-resetting performance of the side joints can be enhanced through the springs, the post-earthquake repairable performance of the suspended ceiling structure is greatly improved, and important engineering practical significance is achieved.

Description

Technical Field

[0001] The invention relates to the field of suspended ceiling peripheral restraints, and in particular to a suspended ceiling peripheral restraint with a built-in bidirectional compression spring and an axial bearing capacity testing method. Background Art

[0002] As one of the typical non-structural components, suspended ceilings are widely used in various public buildings and civil buildings. However, the seismic performance of suspended ceilings is poor, which can easily lead to node damage, panel detachment and even large-scale collapse during earthquakes. There are many factors that affect the seismic performance of suspended ceiling systems, and boundary conditions are considered to be one of the most critical factors. The traditional domestic suspended ceiling boundary structure is relatively simple, usually the free edge of the end of the outermost main keel is directly placed on the side keel, without other connection or restraint measures. Under the action of an earthquake, the seismic motion is transmitted to the suspended ceiling system through the amplification effect of the main structure of the building, and the main keel of the suspended ceiling system is easy to fall off the side keel, causing the failure and collapse of the entire suspended ceiling system.

[0003] Based on the above problems, some people have proposed to use rivets or anti-seismic clips to constrain the ends of the keel components. This approach has improved the anti-seismic performance of this type of ceiling edge nodes to a certain extent. However, the anti-seismic clips may be twisted or even damaged due to insufficient constraints on surrounding components; at the same time, due to the lack of an effective reset mechanism, the ceiling system is difficult to restore to its original position after an earthquake, which poses a serious threat to the stability and safety of the ceiling system.

[0004] Based on the above-mentioned technical problems, there is an urgent need for a ceiling peripheral restraint that can overcome the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to provide a ceiling peripheral restraint with a built-in bidirectional compression spring and a test method. The restraint involved in the present invention can be used to connect the end of the main keel of a suspended ceiling to the wall. The compression spring in the restraint can consume the seismic energy transmitted to the edge node by the main structure of the building, provide a certain axial stiffness for the edge node, and realize the reset of the ceiling after the earthquake effect disappears, effectively ensuring the safety of the ceiling system. In addition, appropriate pre-pressure can be applied to the compression spring to further improve the seismic performance of the edge node.

[0006] The present invention is achieved through the following technical solutions:

[0007] The present invention relates to a ceiling peripheral restraint with a built-in bidirectional compression spring, comprising: a new fastener 1, a screw rod 2, a nut 3, a round gasket 4, a compression spring 5, a square gasket 6, a lifting eye bolt 7, and a lifting eye nut 8;

[0008] The compression spring 5 is sleeved on the screw rod 2, and both ends of the screw rod 2 are arranged on the new fastener 1;

[0009] The new fastener 1 is composed of a web with a T-shaped space reserved in the center and an upper flange and a lower flange extending from the ends of the web; the cross section of the web of the new fastener 1 is an I-shaped;

[0010] The web of the new fastener 1 is provided with a long slide groove 1-1 at the bending part; the upper flange and the lower flange are provided with bolt holes 1-2; stiffening ribs 1-4 are provided between the upper flange, the lower flange and the web, and are staggered;

[0011] When the compression springs 5 ​​in the restraint are in a free state, when the eyebolt 7 is pulled along with the main keel 10, the two compression springs 5 ​​at the bottom are compressed and deformed, and the two compression springs 5 ​​at the top do not play a role. At this time, the stiffness K of the restraint 1 satisfy:

[0012]

[0013] When the compression spring 5 reaches the maximum compression, the new fastener 1 begins to deform, and the stiffness K of the constraint 2 satisfy:

[0014]

[0015] Among them, △F represents the load applied to the edge node; △X represents the compression amount of the compression spring; k represents the stiffness of the compression spring; E is the elastic modulus of the new fastener 1, which is related to its material; A is the cross-sectional area of ​​the web of the new fastener 1, and L is the length of the web of the new fastener 1.

[0016] Similarly, when the eyebolt 7 is compressed in the opposite direction to the main keel 10, the two upper compression springs 5 ​​are compressed and deformed, and the two lower compression springs 5 ​​do not play a role. The stiffness formulas of the edge nodes at each stage are the same as above.

[0017] Initial preload is applied to the compression springs 5 ​​in the constraint, that is, the four compression springs 5 ​​are initially in a compressed deformation state; when the eyebolt 7 is pulled along with the main keel 10, the compression amount of the two compression springs 5 ​​at the bottom increases, and the compression amount of the two compression springs 5 ​​at the top decreases. At this time, the stiffness K of the edge node 1 The same equation (1) is satisfied. When the compression spring reaches the maximum compression, the new fastener deforms. At this time, the stiffness K of the edge node is 2 Similarly, when the eyebolt 7 is compressed in the opposite direction to the main keel 10, the compression of the two upper compression springs 5 ​​increases, and the compression of the two lower compression springs 5 ​​decreases, and the stiffness formulas of the edge nodes at each stage are the same as above.

[0018] Preferably, one end of the screw rod 2 is fixed through the bolt hole 1-2 of the upper flange, and the other end is fixed through the bolt hole 1-2 of the lower flange.

[0019] Preferably, the T-shaped space of the web of the novel fastener 1 is used to accommodate the main keel 10 with a T-shaped cross section.

[0020] Preferably, the T-shaped space reserved in the web of the novel fastener 1 can just accommodate the main keel with a T-shaped cross-section.

[0021] Preferably, there are two screw rods 2 and they are symmetrically arranged; there are two compression springs 5 ​​on each screw rod 2 and they are separated by square washers 6 , eye bolts 7 and eye nuts 8 .

[0022] Preferably, the eye bolt 7 passes through the slide groove 1 - 1 and is connected to the eye nut 8 to fix the two screw rods 2 .

[0023] Preferably, the upper flange is provided with four screw holes 1-3, which are distributed around the bolt hole 1-2. The main keel 10 is connected to the floor slab via the suspension rod, and screws are installed on the screw holes 1-3 to connect with the side keel 9 and the wall to form a ceiling side node.

[0024] The present invention also relates to a method for testing the axial bearing capacity of the aforementioned ceiling peripheral restraint with built-in bidirectional compression spring, and the device used in the testing method comprises: a T-shaped base device 11, a testing machine, and a clamping device;

[0025] T-shaped base device 11, used to fix the edge node;

[0026] A clamping device for clamping the main keel 10 in the edge node;

[0027] The main keel 10 is clamped and fixed by a clamping device, the clamping device is fixed at one end of the testing machine, and the T-shaped base device 11 is fixed at the other end, and an axial load is applied to the edge node of the ceiling to perform an axial performance test of the edge node;

[0028] The test method includes the following steps:

[0029] Step 1, the main keel 10 is arranged vertically in the center, and the side keels 9 and the square wooden board 14 perpendicular thereto are overlapped and fixed together on the transverse steel plate 11-1 of the T-shaped base device 11; wherein the square wooden board 14 is fixed to the transverse steel plate 11-1 by bolts, the side keels 9 are fixed to the square wooden board 14 by screws 13, the upper end of the main keel 10 is connected to the ceiling peripheral restraint with a built-in bidirectional compression spring, and the lower end is connected by a pair of loading pads 12 by bolts;

[0030] Step 2, clamp the vertical steel plate 11-2 of the T-shaped base device 11 through the fixed end chuck above the testing machine, and clamp the loading pad 12 through the loading end chuck below. When loading, apply displacement and force by tensioning the loading pad 12 below to perform an axial bearing capacity test.

[0031] Preferably, the T-shaped base device 11 includes a vertical steel plate 11-2, four stiffening steel plates 11-3 evenly distributed on the upper part of the vertical steel plate 11-2, and a transverse steel plate 11-1 horizontally distributed on the top of the vertical steel plate 11-2 and the stiffening steel plate 11-3.

[0032] Preferably, the clamping device includes a pair of loading pads 12 , and the loading pads 12 are provided with loading pad bolt holes 12 - 1 for fixing the main keel 10 .

[0033] Preferably, the upper end of the main keel 10 is connected to the side keels 9 and the square wooden board 14 through a new fastener 1, and the lower end thereof is fixed by a pair of loading pads 12 through bolts.

[0034] The present invention has the following advantages:

[0035] (1) The ceiling peripheral restraint with built-in bidirectional compression spring involved in the present invention is a symmetrical structure. After the bidirectional compression spring and other components are installed and combined with the main keel through the slide groove, it is also a symmetrical structure. When the main keel undergoes axial displacement, the eye bolt will slide vertically along the slide groove, effectively increasing the ultimate deformation capacity of the edge node, thereby reducing fatigue damage to the ceiling keel.

[0036] (2) Compared with the edge nodes generally connected by rivets or anti-seismic clips, the addition of bidirectional compression springs can absorb part of the seismic energy during an earthquake, significantly reducing the shaking and deformation of the edge nodes of the ceiling keel, thereby reducing the displacement of the edge nodes and ensuring the stability of the edge nodes. At the same time, the bidirectional compression springs are arranged bidirectionally and symmetrically in the constraint parts to ensure that they can play their role regardless of tension or pressure.

[0037] (3) The edge node intervals connected by the restraints are connected to the floor slab via hangers, making the reset structure more stable. If external impact or vibration occurs, the compression springs can relieve the stress on the structure, reducing the possibility of structural damage and reducing the cost of repair and maintenance.

[0038] (4) The new fastener device, edge keel, square wood board, T-shaped base device, and clamping device are all connected by screws or bolts, without the need for complicated installation processes and tools, effectively avoiding damage such as device torsion caused by insufficient constraints on surrounding components, and effectively improving the stiffness and bearing capacity of the edge node. In addition, the related components of the new fastener device are low-cost and have good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of the new fastener;

[0040] Figure 2 It is a structural schematic diagram of a ceiling peripheral restraint member with a built-in bidirectional compression spring according to the present invention;

[0041] Figure 3 This is an overall effect diagram of a ceiling system connected by the restraining member of the present invention;

[0042] Figure 4 is a schematic diagram of ceiling edge nodes connected by the restraining member of the present invention;

[0043] Figure 5 is a top view of the ceiling edge nodes connected by the restraining member of the present invention;

[0044] Figure 6 It is an exploded view of the ceiling peripheral restraint member with built-in bidirectional compression spring of the present invention;

[0045] Figure 7 It is a schematic diagram of the structure of the T-shaped base device;

[0046] Figure 8 It is a schematic diagram of the structure of the loading pad;

[0047] Fig. 9 It is a test display diagram for testing the axial performance of the ceiling edge node using the present invention;

[0048] Fig.10 It is the load-displacement monotonic loading curve of the ceiling edge node using this restraint;

[0049] Fig.11 is the load-displacement hysteresis loading curve of the ceiling edge node using the present restraint;

[0050] Figure numerals: 1. new fastener; 2. screw; 3. nut; 4. round gasket; 5. compression spring; 6. square gasket; 7. eyebolt; 8. eyenut; 9. side keel; 10. main keel; 11. T-shaped base device; 12. loading pad; 13. screw; 14. square wooden board; 1-1 is the slide groove; 1-2 is the bolt hole; 1-3 is the screw hole; 1-4 is the stiffening rib; 11-1 is the transverse steel plate; 11-2 is the vertical steel plate; 11-3 is the stiffening steel plate; 11-4 is the bolt hole of the transverse steel plate, and 12-1 is the bolt hole of the loading pad. DETAILED DESCRIPTION

[0051] The present invention is described in detail below in conjunction with specific embodiments. It should be noted that the following embodiments are only further descriptions of the present invention, but the protection scope of the present invention is not limited to the following embodiments.

[0052] The present embodiment is a ceiling peripheral restraint with a built-in bidirectional compression spring, comprising: a new fastener 1, a screw 2, a nut 3, a round washer 4, a compression spring 5, a square washer 6, an eye bolt 7, and an eye nut 8, see Figure 2 As shown;

[0053] The compression spring 5 is sleeved on the screw rod 2, and both ends of the screw rod 2 are arranged on the new fastener 1;

[0054] The new fastener 1 is composed of a web with a T-shaped space reserved in the center and an upper flange and a lower flange extending from the ends of the web; the cross section of the web of the new fastener 1 is an I-shaped;

[0055] like Figure 1 As shown, the new fastener 1 is composed of a web with a T-shaped space reserved in the center and an upper flange and a lower flange extending from the end of the web; the web section of the new fastener 1 is I-shaped; wherein the web section is provided with a slide groove 1-1 at the bending part, the upper and lower flanges are provided with bolt holes 1-2 and screw holes 1-3 for connecting to the wall, and the portion between the flange and the web section is provided with stiffening ribs 1-4, which are staggered.

[0056] like Figure 2 As shown, the constraint part behind the built-in bidirectional compression spring includes a new fastener 1, a screw rod 2, a nut 3, a square gasket 6, a round gasket 5, an eye bolt 7, an eye nut 8 and a compression spring 5, wherein the screw rod 2 is installed in the bolt holes 1-2 distributed on the upper and lower flanges of the new fastener 1, and is connected to the eye nut 8 through the eye bolt 7 to maintain symmetry, and the remaining components are nested on the screw rod 2.

[0057] like Figure 3 , 4 As shown in FIG. 5 , it can be seen that the main keel 10 with a T-shaped cross section can be exactly placed in the T-shaped space reserved by the new fastener 1 and fixed by the eye bolt 7 and the eye nut 8. In the overall system, the main keel 10 is connected to the floor slab via the suspension rod interval, and the side keel 9 is fixed to the wall by screws 13.

[0058] The ceiling peripheral restraint member with built-in bidirectional compression spring of the present invention is installed in the ceiling system.

[0059] The specific installation steps are as follows:

[0060] Step 1: Open a hole on the main keel 10, the diameter of which is consistent with the diameter of the eye bolt 7, and connect the main keel 10 and the new fastener 1 through the eye bolt 7;

[0061] Step 2: Install the screw rod 2 on one side of the eyebolt 7 and pass it through the eyebolt. Install the square gasket 6, compression spring 5, round gasket 4 and nut 3 on the upper and lower parts of the eyebolt 7. Fix it by installing the nut 3 under the lower flange of the new fastener 1. Make sure that the eyebolt on this side is exactly in the center of the slide groove of the new fastener 1 after fixing.

[0062] Step 3: Connect the eye nut 8 to the eye bolt 7 on the other side, and install the screw rod 2, square gasket 6, compression spring 5, round gasket 4, and nut 3 in the same way as step 2. Fix this side by installing the nut 3 under the lower flange of the new fastener 1. It is necessary to ensure that the eye bolt 7 and the eye nut 8 are exactly in the center of the slide groove of the new fastener 1 after installation, and the two sides of the web of the new fastener 1 are symmetrical and on the same horizontal plane;

[0063] Step 4: Install screws 13 on the screw holes 1-3 reserved on the upper flange of the new fastener 1 to connect the side keel 9 and the wall to form a side node.

[0064] like Figure 7 , 8 As shown, a test device for testing the axial performance of edge nodes connected by the device of the invention is provided, which includes a T-shaped base device 11 composed of a vertical steel plate 11-2, a horizontal steel plate 11-1, four stiffening steel plates 11-4, and a clamping device composed of two loading pads 12 for clamping the main keel 10. The vertical steel plate 11-2 is located on the central axis of the long side of the horizontal steel plate 11-1, and the two are vertically connected by welding. The two stiffening steel plates 11-4 on each side of the vertical steel plate 11-2 are vertically connected to the horizontal steel plate 11-1 by welding to improve the stability of the structure. The horizontal steel plate 11-1 and the loading pad 12 are both provided with bolt holes 12-1 to facilitate fixed connection with the square wooden board 14 and the main keel 10. All structural components of the test device are made of Q345 steel.

[0065] The test device and test method of the present invention can be used to test the axial performance of the ceiling edge node. The test schematic diagram is shown in FIG. Fig. 9 shown.

[0066] The main keel 10 of the side node is arranged vertically in the center, and the side keel 9 perpendicular to the main keel is overlapped with the square wooden board 14 and fixed to the horizontal steel plate 11-1 of the T-shaped base device 11, wherein the square wooden board 14 is fixed to the horizontal steel plate 11-1 by bolts, and the side keel 9 is fixed to the square wooden board 14 by screws 13. The upper end of the main keel 10 is connected by a constraint device with a built-in bidirectional compression spring, and the lower end is connected by a pair of loading pads 5 by bolts. Before the test, the vertical steel plate 11-2 of the T-shaped base device 11 is clamped by the upper fixed end clamp of the test machine, and the loading pad 5 is clamped by the lower loading end clamp. During loading, since the lower side keel 9 and the square wooden board 14 are fixed to the T-shaped base device 11 by bolts, the axial performance test of the side node applies displacement and force by pulling the upper main keel 10. Since the main keel 10 is connected to the new fastener 1 by the eye bolt 7, the force is first transmitted to the new fastener device 1 through the eye bolt 7 and the compression spring 5, and then transmitted to the square wooden board 14 through the screw 13 connected to the side keel 9 and the new fastener device 1, and then transmitted to the transverse steel plate 11-1 through the bolts connecting the transverse steel plate 11-1 and the square wooden board 14. The transverse steel plate 11-1 finally transmits the force to the vertical steel plate 11-2 through the stiffening steel plate 11-3, and the base device structure is stable.

[0067] Fig.10 The load-displacement monotonic curve diagram of the axial performance of the edge nodes connected by the device of the invention.

[0068] When the compression springs 5 ​​in the constraint are all in a free state, after loading begins, the two compression springs 5 ​​at the bottom begin to compress and deform, and the node load begins to rise. The node stiffness at this stage is the sum of the stiffnesses of the two compression springs 5; as the displacement of the loading end increases, when the compression spring 5 reaches the maximum compression, the new fastener 1 begins to deform, and the node load rises at a greater growth rate. The node stiffness at this stage is the sum of the compression stiffness of the two compression springs 5 ​​and the axial deformation stiffness of the new fastener 1; until the new fastener 1 reaches its failure bearing capacity, the flange and web connection breaks and the load dissipates.

[0069] When the compression springs 5 ​​in the constraint have initial preload, that is, they are in a state of compression deformation, after loading begins, the compression of the two compression springs 5 ​​at the bottom increases while the compression of the two compression springs 5 ​​at the top decreases, and the node load begins to rise. Compared with the node load without preload of the compression spring, it is larger, but the node stiffness is also the sum of the stiffness of the two compression springs 5; with the increase of the displacement of the loading end, when the compression spring 5 reaches the maximum compression, the new fastener 1 begins to deform, and the node load increases at a greater growth rate. The node stiffness at this stage is also the sum of the compression stiffness of the two compression springs 5 ​​and the axial deformation stiffness of the new fastener 1. Until the new fastener 1 reaches its failure bearing capacity, the flange and the web connection break, and the load dissipates.

[0070] Fig.11 The load-displacement hysteresis curve of the axial performance of the edge node connected by the device of the invention is shown in FIG. It can be seen that under the action of small displacement, the compression spring 5 plays a major role, and the curve returns to the far point after unloading, indicating that the ceiling node can restore its initial position; when the displacement gradually increases and exceeds the maximum compression of the compression spring, the new fastener 1 begins to produce plastic deformation, and the residual displacement after unloading is very small, and the curve presents a flag shape, which can generally achieve the effect of enhancing the self-resetting performance of the node.

[0071] For the edge nodes of the ceiling peripheral restraints with built-in bidirectional compression springs involved in the present invention installed in the ceiling system, before the earthquake, the edge nodes are in normal working condition, the main keel 10 and the side keel 9 are firmly connected to each other through the restraints of the present invention to form a stable ceiling structure, and the compression spring is in the initial state.

[0072] When an earthquake occurs, the building structure will be affected by the ground shaking, generating horizontal or vertical earthquake effects, which will be transmitted to the edge nodes through the main structure. When the main keel 10 produces a certain displacement under the action of the earthquake force, the force is transmitted to the compression spring 5 through the eye bolt 7 in the constraint of the present invention. When the compression spring 5 is in a free state, the main keel 10 is pulled, and the two lower compression springs 5 ​​in the constraint of the present invention are compressed and deformed; the main keel 10 is compressed, and the two upper compression springs 5 ​​in the constraint of the present invention are compressed and deformed; because the compression spring 5 is elastic, it can absorb and store external energy, so that the edge node only produces elastic deformation within a certain range, slowing down the movement speed of the main keel 10, and at the same time enhancing the axial stiffness of the node, effectively avoiding the keel component from a large lateral displacement, collision with other structures, and damage or even collapse caused by insufficient strength, thereby improving the seismic performance of the overall structure. When the earthquake weakens or stops, the compression spring will quickly return to its original position, gradually release the stored energy, and restore the edge node to its initial state. This self-resetting ability enables the ceiling system to recover quickly after an earthquake, reducing the possibility of permanent deformation of the structure.

[0073] The ceiling peripheral restraint with built-in bidirectional compression spring involved in the present invention is a symmetrical structure. After the bidirectional compression spring and other components are installed and combined with the main keel through the slide groove, it is also a symmetrical structure. When the main keel undergoes axial displacement, the eye bolt will slide vertically along the slide groove, effectively increasing the ultimate deformation capacity of the edge node, thereby reducing the fatigue damage of the ceiling keel; the present invention adds a bidirectional compression spring, which can absorb part of the seismic energy during an earthquake, significantly reducing the shaking and deformation of the edge node of the ceiling keel, thereby reducing the displacement of the edge node, thereby ensuring the stability of the edge node. At the same time, the bidirectional compression spring is bidirectionally symmetrically arranged in the restraint to ensure that it can play its role regardless of tension or pressure; the present invention does not require complicated installation processes and tools, effectively avoiding damage such as device torsion due to insufficient constraints of peripheral components, and effectively improving the stiffness and bearing capacity of the edge node. In addition, the related components of the new fastener device are low-cost and have good application prospects.

[0074] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which will not affect the essence of the present invention.

Claims

1. A ceiling peripheral restraint with a built-in bidirectional compression spring, characterized in that: include: New fastener (1), screw (2), nut (3), round washer (4), compression spring (5), square washer (6), eye bolt (7), eye nut (8); The compression spring (5) is sleeved on the screw rod (2), and both ends of the screw rod (2) are arranged on the new fastener (1); The novel fastener (1) is composed of a web with a T-shaped space reserved in the center and an upper flange and a lower flange extending from the ends of the web; the cross section of the web of the novel fastener (1) is an I-shape; The web of the novel fastener (1) is provided with a long slide groove (1-1) at the bending part; the upper flange and the lower flange are provided with bolt holes (1-2); stiffening ribs (1-4) are provided between the upper flange, the lower flange and the web, and are arranged in a staggered manner; When the compression spring begins to compress and deform, the stiffness K1 of the constraint meets the following conditions: When the compression spring reaches the maximum compression amount, the new fastener (1) begins to deform, and the stiffness K2 of the constraint part satisfies: Wherein, △F represents the load applied to the edge node; △X represents the compression amount of the compression spring; k represents the stiffness of the compression spring; E is the elastic modulus of the new fastener (1), which is related to its material; A is the cross-sectional area of ​​the web of the new fastener (1), and L is the length of the web of the new fastener (1).

2. The ceiling peripheral restraint with built-in bidirectional compression spring according to claim 1, characterized in that: One end of the screw rod (2) is fixed through a bolt hole (1-2) on the upper flange, and the other end is fixed through a bolt hole (1-2) on the lower flange.

3. The ceiling peripheral restraint member with built-in bidirectional compression spring as claimed in claim 1, characterized in that: The T-shaped space of the web of the novel fastener (1) is used to accommodate a main keel (10) with a T-shaped cross section.

4. The ceiling peripheral restraint member with built-in bidirectional compression spring as claimed in claim 1, characterized in that: The number of the screw rods (2) is two and they are symmetrically arranged; the number of the compression springs (5) on each screw rod (2) is two and they are separated by a square gasket (6), a lifting eye bolt (7) and a lifting eye nut (8).

5. The ceiling peripheral restraint member with built-in bidirectional compression spring as claimed in claim 4, characterized in that: The eye bolt (7) passes through the slide groove (1-1) and is connected to the eye nut (8) to fix the two screw rods (2).

6. The ceiling peripheral restraint member with built-in bidirectional compression spring as claimed in claim 1, characterized in that: The upper flanges are each provided with four screw holes (1-3) distributed around the bolt hole (1-2).

7. A method for testing the axial bearing capacity of a ceiling peripheral restraint with a built-in bidirectional compression spring as claimed in claim 1, characterized in that: The device used in the test method comprises: a T-shaped base device (11), a testing machine, and a clamping device; A T-shaped base device (11) for fixing the edge node; A clamping device for clamping the main keel (10) in the edge node; The main keel (10) is clamped and fixed by a clamping device, the clamping device is fixed at one end of the testing machine, and a T-shaped base device (11) is fixed at the other end, an axial load is applied to the edge node of the suspended ceiling, and an axial performance test of the edge node is performed; The test method includes the following steps: Step 1, vertically centering the main keel (10), overlapping the vertical side keel (9) and the square wooden board (14) and fixing them together on the transverse steel plate (11-1) of the T-shaped base device (11); wherein the square wooden board (14) is fixed to the transverse steel plate (11-1) by bolts, the side keel (9) is fixed to the square wooden board 14 by screws (13), the upper end of the main keel (10) is connected to the ceiling peripheral restraint with a built-in bidirectional compression spring, and the lower end is connected by a pair of loading pads (12) by bolts; Step 2, clamp the vertical steel plate (11-2) of the T-shaped base device (11) by the upper fixed end clamp of the testing machine, and clamp the loading pad (12) by the lower loading end clamp. When loading, the displacement and force are applied by tensioning the lower loading pad (12) to perform an axial bearing capacity test.

8. The axial bearing capacity testing method of the ceiling peripheral restraint member with built-in bidirectional compression spring as claimed in claim 7, characterized in that: The T-shaped base device (11) comprises a vertical steel plate (11-2), four stiffening steel plates (11-3) evenly distributed on the upper part of the vertical steel plate (11-2), and a transverse steel plate (11-1) horizontally distributed on the top of the vertical steel plate (11-2) and the stiffening steel plate (11-3).

9. The axial bearing capacity testing method of the ceiling peripheral restraint member with built-in bidirectional compression spring according to claim 7, characterized in that: The clamping device comprises a pair of loading pads (12), and loading pad bolt holes (12-1) for fixing the main keel (10) are provided on the loading pads (12).

10. The method for testing the axial bearing capacity of the ceiling peripheral restraint with built-in bidirectional compression spring as claimed in claim 7, characterized in that: The upper end of the main keel (10) is connected to the side keels (9) and the square wooden board (14) through a new type fastener (1), and the lower end is fixed by a pair of loading pads (12) through bolts.

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