Prefabricated restrained concrete seismic structure

Abstract

The application relates to the technical field of building engineering, in particular to a fabricated constraint concrete damping structure, which comprises a positioning plate and a cylindrical rod, the cylindrical rod is located at the back side of the positioning plate, a U-shaped fixed plate is fixedly arranged at the front side of the positioning plate, the U-shaped fixed plate is fixed in a first positioning groove, two side plates are symmetrically arranged at the two ends of the positioning plate, two positioning seats are symmetrically arranged at the two ends of the cylindrical rod, and an annular baffle is fixedly arranged at the middle part of the cylindrical rod. The structure forms a multiple energy dissipation mechanism through a damper, a damping rod, a damping spring, a damping pad and frictional resistance. The damper directly buffers the impact force, the damping spring absorbs energy through elastic deformation, the frictional resistance of the annular sleeve and the cylindrical rod and the frictional resistance of the threaded rod and the cylindrical rod dissipate the residual vibration, and the damping pad buffers local shaking. Multiple actions synergistically generate force, stress concentration is effectively avoided, and the fatal defects that the traditional rigid connection node welds are prone to fatigue cracking and brittle failure are solved.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, specifically to a prefabricated confined concrete vibration damping structure. Background Technology

[0002] Precast steel-confined concrete shear walls have become a core structural form in the modernization of the construction industry due to their advantages of high industrial production efficiency and good structural integrity. However, the seismic energy dissipation performance of their joints is a key bottleneck restricting the structure's disaster resistance.

[0003] Patent CN104895221A discloses a prefabricated steel-confined concrete shear wall structure, including longitudinal and transverse wall panels. Its key feature is that the ends of the longitudinal and transverse wall panels are equipped with H-beams, with one flange of the H-beam exposed. A steel pipe is located in the core area of ​​the nodes. A connecting plate is vertically connected to the exposed H-beam flange at regular intervals, with the other end of the connecting plate fixed to the steel pipe. Thus, the H-beams and square steel pipes are connected by the connecting plates to form the node area skeleton. Concrete is poured at the node area skeleton to connect with the longitudinal and transverse wall panels, forming an integral shear wall. This invention connects the longitudinal and transverse wall panels to the core steel pipe into a whole through connecting plates. Due to the constraint of the steel skeleton, the seismic performance of the concrete in the node area is improved, giving the structural system good overall performance. The construction process of this structural system is simple, facilitating formwork erection and reducing the amount of wet work on the construction site.

[0004] In the aforementioned structure, the rigid connecting plates link the end steel sections of the wall panels to the steel pipes in the core area of ​​the node to form an integral skeleton. While this improves the overall integrity of the node, it suffers from a fatal seismic defect: the node lacks an independent energy dissipation structure, and the rigid connecting plates only bear the load transmission function, failing to buffer seismic energy. Seismic loads can only be passively dissipated by the inherent ductility of the concrete and steel sections. Under high-intensity earthquakes, this single energy dissipation mode is prone to stress concentration. The welds of the rigid connecting plates will rapidly develop fatigue cracks due to repeated loads. Once the welds tear, the node will instantly lose its load transmission path, leading to brittle failure and causing overall structural failure. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a prefabricated confined concrete vibration damping structure.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a prefabricated confined concrete vibration damping structure, comprising a transverse wall panel, a longitudinal wall panel, and a vibration damping component, wherein the inner side of the longitudinal wall panel is provided with a second assembly groove, the bottom of the second assembly groove is provided with a plurality of second positioning grooves, the depth of the second positioning groove is greater than the depth of the second assembly groove, and the assembly end of the transverse wall panel is inserted into the interior of the second assembly groove. The shock absorption assembly includes a positioning plate and a cylindrical rod. The cylindrical rod is located on the rear side of the positioning plate, and a U-shaped fixing plate is fixedly installed on the front side of the positioning plate. The U-shaped fixing plate is fixed inside the first positioning groove. Two side plates are symmetrically arranged at both ends of the positioning plate, and two positioning seats are symmetrically arranged at both ends of the cylindrical rod. An annular baffle is fixedly installed in the middle part of the cylindrical rod. Two inclined rods are symmetrically arranged on the outer side of the positioning plate. An annular sleeve is provided at the end of the inclined rod away from the positioning plate. The annular sleeve is penetrated by the cylindrical rod and is slidably connected to the cylindrical rod. The rear end of the inclined rod is hinged to the annular sleeve, and the front end of the inclined rod is hinged to the positioning plate. A shock absorber is fixedly installed at the front end of the positioning seat. A shock absorber rod connecting the side plate is provided at the front end of the shock absorber. The shock absorption assembly is located inside the second positioning groove, and the positioning seat is fixed inside the second positioning groove by bolts.

[0007] To improve the vibration reduction effect of this structure, the present invention includes the following improvement: two first grooves are symmetrically arranged on the inner wall of the U-shaped fixing plate, and a vibration damping pad is fixedly arranged in the first groove. The U-shaped fixing plate is fixed inside the first positioning groove by bolts.

[0008] Furthermore, an improvement of the present invention is that two shock-absorbing springs are symmetrically arranged on both sides of the annular baffle, one end of the shock-absorbing spring is fixed to one side of the annular baffle, and the other end of the shock-absorbing spring is fixed to one side of the annular sleeve.

[0009] To facilitate temporary adjustment of the positions of the side plate and the positioning seat, the present invention includes the following improvements: two symmetrical mating grooves are provided at both ends of the positioning plate; a connecting rod is provided at the lower end of the side plate and inserted into the mating groove, the connecting rod slidingly engaging with the positioning plate; two symmetrical positioning holes are provided at both ends of the cylindrical rod; a rectangular rod is provided at the lower end of the positioning seat and inserted into the positioning hole, the rectangular rod slidingly engaging with the cylindrical rod; a second groove is provided at the upper end of the positioning seat, a rotating shaft is provided in the second groove, the rotating shaft passes through the positioning seat and is inserted into the cylindrical rod, the rotating shaft is rotatably connected to the positioning seat; a threaded rod is provided at the lower end of the rotating shaft, the threaded rod is inserted into the cylindrical rod and threadedly connected to the cylindrical rod.

[0010] Furthermore, an improvement of the present invention is that the connecting rod is tightly fitted with the docking groove, and the rectangular rod is tightly fitted with the positioning hole.

[0011] To facilitate the rotation of the shaft, the present invention includes an improvement in which a bearing is inlaid inside the positioning seat, the inner ring of the bearing is penetrated by the shaft, and a knob is provided at the upper end of the shaft. The knob is located inside the second groove and has a cross groove.

[0012] Furthermore, an improvement of the present invention is that the front end of the shock absorber is fixed to the rear end of the side plate by screws.

[0013] To improve the stability of this structure during use, the present invention includes improvements such as frictional resistance between the annular sleeve and the cylindrical rod, and frictional resistance between the threaded rod and the cylindrical rod.

[0014] (III) Beneficial Effects Compared with the prior art, the present invention provides a prefabricated confined concrete vibration damping structure, which has the following beneficial effects: This structure forms a multiple energy dissipation mechanism through shock absorbers, shock absorber rods, shock absorber springs, shock absorber pads, and frictional resistance. The shock absorbers directly buffer the impact force of collisions, the shock absorber springs absorb energy through elastic deformation, the frictional resistance between the annular sleeve and the cylindrical rod, and between the threaded rod and the cylindrical rod dissipates the residual vibration, and the shock absorber pads buffer local swaying. The multiple actions work together to effectively avoid stress concentration, solve the fatal defects of traditional rigid connection nodes that are prone to fatigue cracking and brittle failure, and significantly improve the seismic energy dissipation performance of the structure.

[0015] With the help of the combined design of knobs, shafts, and bearings, the position of the positioning seat and the side plate can be easily adjusted: the bearings reduce the rotational friction of the shaft, the cross-groove knob facilitates the application of force, and the threaded fit between the threaded rod and the cylindrical rod, the sliding fit between the rectangular rod and the positioning hole, and the sliding fit between the connecting rod and the mating groove enable precise adjustment of the component position to adapt to different assembly scenarios. Attached Figure Description

[0016] Figure 1 This is a first-view three-dimensional structural diagram of the present invention; Figure 2 This is a second-view three-dimensional structural diagram of the present invention; Figure 3 This is the front view of the present invention; Figure 4 For the present invention Figure 1 A magnified schematic diagram of the local structure at point A; Figure 5 This is an assembly diagram of the rectangular rod in this invention.

[0017] In the diagram: 1. Horizontal wall panel; 2. Vertical wall panel; 3. First assembly slot; 4. First positioning slot; 5. Second assembly slot; 6. Second positioning slot; 7. U-shaped fixing plate; 8. First groove; 9. Shock-absorbing pad; 10. Positioning plate; 11. Side plate; 12. Connecting rod; 13. Cylindrical rod; 14. Positioning seat; 15. Positioning hole; 16. Rectangular rod; 17. Rotating shaft; 18. Annular baffle; 19. Annular sleeve; 20. Shock-absorbing spring; 21. Diagonal rod; 22. Shock absorber; 23. Shock-absorbing rod; 24. Second groove. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-5 The present invention provides a prefabricated confined concrete vibration damping structure, including a transverse wall panel 1, a longitudinal wall panel 2, and a vibration damping component. The inner side of the longitudinal wall panel 2 is provided with a second assembly groove 5, and the bottom of the second assembly groove 5 is provided with a plurality of second positioning grooves 6. The depth of the second positioning grooves 6 is greater than the depth of the second assembly groove 5. The assembly end of the transverse wall panel 1 is inserted into the second assembly groove 5. The shock absorption assembly includes a positioning plate 10 and a cylindrical rod 13. The cylindrical rod 13 is located on the rear side of the positioning plate 10. A U-shaped fixing plate 7 is fixedly installed on the front side of the positioning plate 10. The U-shaped fixing plate 7 is fixed inside the first positioning groove 4. Two side plates 11 are symmetrically arranged at both ends of the positioning plate 10. Two positioning seats 14 are symmetrically arranged at both ends of the cylindrical rod 13. An annular baffle 18 is fixedly installed in the middle part of the cylindrical rod 13. Two inclined rods 21 are symmetrically arranged on the outer side of the positioning plate 10. An annular sleeve 19 is provided at the end of the inclined rod 21 away from the positioning plate 10. The annular sleeve 19 is penetrated by the cylindrical rod 13 and is slidably connected to the cylindrical rod 13. The rear end of the inclined rod 21 is hinged to the annular sleeve 19, and the front end of the inclined rod 21 is hinged to the positioning plate 10. A shock absorber 22 is fixedly installed at the front end of the positioning seat 14. A shock absorber rod 23 connecting the side plate 11 is provided at the front end of the shock absorber 22. The shock absorption assembly is located inside the second positioning groove 6, and the positioning seat 14 is fixed inside the second positioning groove 6 by bolts.

[0020] Structural assembly stage: Component pre-adjustment: First, calibrate the positions of the positioning seat 14 and the side plate 11. Rotate the knob located in the second groove 24 of the positioning seat 14. The cross groove on the surface of the knob facilitates the application of force. With the help of the bearing embedded inside the positioning seat 14, the rotating shaft 17 can be smoothly driven to rotate. The threaded rod at the lower end of the rotating shaft 17 forms a threaded engagement with the cylindrical rod 13. During rotation, the rectangular rod 16 of the positioning seat 14 is driven to slide in the positioning hole 15 of the cylindrical rod 13 until the positioning seat 14 reaches the preset installation position. The rectangular rod 16 and the positioning hole 15 are tightly fitted to ensure positioning stability. At the same time, push the side plate 11 to make the connecting rod 12 at the lower end slide in the mating groove of the positioning plate 10. After the connecting rod 12 is tightly fitted with the mating groove, fix the front end of the shock absorber 23 to the rear end of the side plate 11 with screws, so that the shock absorber 23 and the shock absorber 22 at the front end of the positioning seat 14 form a stable connection.

[0021] Vibration damping component fixing: Place the adjusted vibration damping component into the second positioning groove 6 at the bottom of the second assembly groove 5 inside the longitudinal wall plate 2, and fix the positioning seat 14 firmly in the second positioning groove 6 with bolts to ensure that the vibration damping component is installed in a precise and stable position.

[0022] Wall panel assembly: Slowly insert the assembly end of the horizontal wall panel 1 into the second assembly groove 5 of the vertical wall panel 2. At the same time, the U-shaped fixing plate 7 on the front side of the positioning plate 10 is simultaneously embedded into the first positioning groove 4. Shock-absorbing pads 9 are fixed in the first groove 8 symmetrically arranged on the inner wall of the U-shaped fixing plate 7. After assembly, the U-shaped fixing plate 7 is fastened to the first positioning groove 4 with bolts, completing the assembly of the horizontal wall panel 1 and the vertical wall panel 2. After assembly, the assembly end of the horizontal wall panel 1 is inside the second assembly groove 5, and a shock-absorbing gap is reserved between the assembly end and the inner wall of the second assembly groove 5 to provide buffer space for vibration deformation.

[0023] Vibration reduction working stage: When longitudinal wall panel 2 or transverse wall panel 1 is subjected to external vibration, the structure activates a multi-dimensional damping mechanism: Collision protection and initial energy dissipation: The shock absorber 22 quickly transmits the vibration force through the shock absorber rod 23, directly preventing the horizontal wall plate 1 from colliding directly with the vertical wall plate 2, thus achieving the first layer of vibration buffering.

[0024] Elastic energy dissipation and motion transmission: The vibration force is transmitted to the inclined rod 21 through the side plate 11 and the shock absorber 23. The front end of the inclined rod 21 is hinged to the positioning plate 10, and the rear end is hinged to the annular sleeve 19, which drives the annular sleeve 19 to slide along the cylindrical rod 13. During the sliding process, the annular sleeve 19 compresses the shock absorber springs 20 on both sides. One end of the shock absorber spring 20 is fixed to the annular baffle 18 in the middle of the cylindrical rod 13, and the other end is connected to the annular sleeve 19. The spring absorbs a large amount of vibration energy through its elastic deformation, completing the second stage of energy dissipation.

[0025] Friction energy dissipation and sway buffering: The frictional resistance between the annular sleeve 19 and the cylindrical rod 13, and the frictional resistance between the threaded rod and the cylindrical rod 13, further dissipate the remaining vibration energy during relative motion; at the same time, the shock-absorbing pad 9 inside the U-shaped fixed plate 7 synchronously buffers the swaying of the transverse wall plate 1, reduces the impact of the transverse wall plate 1 on the U-shaped fixed plate 7, and prevents the U-shaped fixed plate 7 from breaking due to excessive vibration stress, forming a third layer of protection.

[0026] Stability assurance: The positioning seat 14 is tightly fitted with the positioning hole 15 through the rectangular rod 16, and the side plate 11 is tightly fitted with the docking groove through the connecting rod 12, ensuring that the connection of each component is stable during vibration. The bearing ensures the smooth rotation of the rotating shaft 17 at all times, and avoids the adjustment mechanism from jamming and affecting the shock absorption effect.

[0027] The use of screws and bolts simplifies the assembly process and reduces the amount of wet work on the construction site. The tight fit between the rectangular rod 16 and the positioning hole 15, and between the connecting rod 12 and the mating groove, ensures the accuracy of the assembly positioning and improves the overall assembly quality of the structure.

[0028] Each component has complementary functions and a stable connection: rigid components such as positioning seat 14, positioning plate 10, and cylindrical rod 13 form a stable framework; annular baffle 18 precisely defines the position of shock-absorbing spring 20; and diagonal rod 21 connects positioning plate 10 and annular sleeve 19 to form a reliable force transmission path, avoiding excessive stress on a single component; elastic components such as shock-absorbing pad 9, shock-absorbing spring 20, and shock absorber 22 buffer vibration impacts and reduce fatigue damage to rigid components; friction resistance design further enhances structural stability during vibration; U-shaped fixing plate 7 is protected from breakage by shock-absorbing pad 9; and the shock-absorbing gap between transverse wall plate 1 and second assembly groove 5 reserves deformation space, effectively preventing failure of the node force transmission path and significantly extending the overall service life of the structure.

[0029] The structure firmly connects the transverse wall panel 1 and the longitudinal wall panel 2 through damping components. This not only ensures the advantages of prefabricated structures in terms of high industrial production efficiency and good overall integrity, but also achieves active damping through independent energy-dissipating structures, rather than relying on the passive energy dissipation of concrete and steel sections. Under extreme conditions such as high-intensity earthquakes, multiple energy-dissipating mechanisms can gradually dissipate vibration energy, preventing instantaneous structural failure and significantly improving the disaster resistance and safety performance of building structures, providing a more reliable structural solution for the modernization of the construction industry.

[0030] Positioning plate 10, cylindrical rod 13: Material: No. 45 quenched and tempered structural steel (or Q345B low alloy structural steel); Reasons for selection: After quenching and tempering, No. 45 steel has both high strength and good toughness, which can withstand the complex stress during vibration and avoid deformation or breakage of the frame; Q345B has higher yield strength and excellent cost performance, making it suitable for mass industrial production. Both can meet the rigid support requirements of the core frame of the vibration damping component.

[0031] U-shaped fixing plate 7: Material: Q235B carbon structural steel; Reasons for selection: Q235B has good forming performance and can be easily processed into a U-shaped structure. Its strength can meet the connection and fixing requirements with the first positioning groove 4. At the same time, it has low cost and is suitable for the economic requirements of building components. Its surface can be hot-dip galvanized to improve its rust resistance.

[0032] Side plate 11, diagonal brace 21: Material: Q345B low alloy structural steel; Reason for selection: The side plate 11 needs to transmit vibration force to the damping rod 23, and the diagonal rod 21 needs to achieve force transmission and buffering through hinge. The high strength and fatigue resistance of Q345B can prevent the two from bending or breaking during repeated vibration, ensuring the stability of the force transmission path.

[0033] Positioning seat 14: Material: 40Cr alloy structural steel (quenched and tempered); Reasons for selection: The positioning seat 14 has the functions of fixing the shock absorption components and adjusting the position. It needs to withstand the bolt preload and vibration impact. After tempering, 40Cr has excellent comprehensive mechanical properties. Its strength, hardness and wear resistance can meet the requirements. It also has good machinability, which makes it easy to process the second groove 24 and the bearing mounting hole.

[0034] Annular baffle 18: Material: Q235B carbon structural steel; Reason for selection: The annular baffle 18 mainly serves as a limit and shock absorber for the spring 20. It does not require ultra-high strength. The Q235B steel has sufficient rigidity and low cost. It can be firmly fixed to the cylindrical rod 13 by welding to ensure the limiting stability of the spring.

[0035] Shock absorber 22: Material: Construction-grade lead-core rubber shock absorber (rubber matrix is ​​a blend of natural rubber and styrene-butadiene rubber, with a pure lead core; if it is a hydraulic shock absorber, the cylinder is made of 45# steel, the hydraulic medium is anti-wear hydraulic oil, and the seals are made of nitrile rubber). Reasons for selection: Lead-core rubber shock absorbers are mature components in the field of building seismic resistance. Rubber can provide elastic cushioning, and the lead core dissipates seismic energy through plastic deformation, which is suitable for the seismic reduction needs of building structures; hydraulic shock absorbers can precisely control vibration damping and are suitable for high-intensity earthquake areas.

[0036] Shock absorber bar 23: Material: 40Cr alloy structural steel (quenched and tempered + galvanized); Reason for selection: The shock absorber rod 23 needs to transmit the damping force of the shock absorber 22. After tempering, 40Cr has excellent strength and fatigue resistance. The galvanizing treatment can improve the rust prevention ability and avoid the force transmission effect due to rust during long-term use.

[0037] Shock-absorbing pad 9: Material: Ethylene propylene diene monomer (EPDM) rubber; Reasons for selection: EPDM rubber has excellent weather resistance, aging resistance and elasticity, and can be used for a long time in outdoor building environment. It can also effectively buffer the shaking impact of the transverse wall panel 1 and protect the U-shaped fixing plate 7 from being damaged by hard impact.

[0038] Shock-absorbing spring 20: Material: 60Si2MnA spring steel; Reason for selection: 60Si2MnA is a special damping spring steel with high elastic limit and excellent fatigue resistance. It can efficiently dissipate vibration energy through repeated elastic deformation, and it has strong stability after heat treatment, which can maintain its damping performance for a long time.

[0039] Ring sleeve 19: Material: Nylon 66 (or tin bronze); Reasons for selection: Nylon 66 has self-lubricating properties and a certain coefficient of friction, which can form a stable frictional resistance with the cylindrical rod 13. At the same time, it is lightweight and wear-resistant, and can help dissipate vibration energy during sliding. Tin bronze has better wear resistance and is suitable for heavy-duty scenarios with extremely high service life requirements.

[0040] In the description herein, it should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A prefabricated confined concrete vibration damping structure, comprising transverse wall panels (1), longitudinal wall panels (2), and vibration damping components, characterized in that: The inner side of the longitudinal wall panel (2) is provided with a second assembly groove (5), and the bottom of the second assembly groove (5) is provided with a plurality of second positioning grooves (6). The depth of the second positioning groove (6) is greater than the depth of the second assembly groove (5), and the assembly end of the transverse wall panel (1) is inserted into the second assembly groove (5). The shock absorption assembly includes a positioning plate (10) and a cylindrical rod (13). The cylindrical rod (13) is located on the rear side of the positioning plate (10). A U-shaped fixing plate (7) is fixedly installed on the front side of the positioning plate (10). The U-shaped fixing plate (7) is fixed inside the first positioning groove (4). Two side plates (11) are symmetrically arranged at both ends of the positioning plate (10). Two positioning seats (14) are symmetrically arranged at both ends of the cylindrical rod (13). An annular baffle (18) is fixedly installed in the middle part of the cylindrical rod (13). Two inclined rods (21) are symmetrically arranged on the outer side of the positioning plate (10). The inclined rods (21) are far from the... An annular sleeve (19) is provided at one end away from the positioning plate (10). The annular sleeve (19) is penetrated by the cylindrical rod (13), and the annular sleeve (19) is slidably connected to the cylindrical rod (13). The rear end of the inclined rod (21) is hinged to the annular sleeve (19), and the front end of the inclined rod (21) is hinged to the positioning plate (10). A shock absorber (22) is fixedly provided at the front end of the positioning seat (14). A shock absorber rod (23) connecting the side plate (11) is provided at the front end of the shock absorber (22). The shock absorber assembly is located inside the second positioning groove (6), and the positioning seat (14) is fixed inside the second positioning groove (6) by bolts.

2. The prefabricated confined concrete vibration damping structure according to claim 1, characterized in that: Two first grooves (8) are symmetrically arranged on the inner wall of the U-shaped fixing plate (7). A shock-absorbing pad (9) is fixedly arranged in the first groove (8). The U-shaped fixing plate (7) is fixed inside the first positioning groove (4) by bolts.

3. The prefabricated confined concrete vibration damping structure according to claim 2, characterized in that: Two shock-absorbing springs (20) are symmetrically arranged on both sides of the annular baffle (18). One end of the shock-absorbing spring (20) is fixed to one side of the annular baffle (18), and the other end of the shock-absorbing spring (20) is fixed to one side of the annular sleeve (19).

4. The prefabricated confined concrete vibration damping structure according to claim 3, characterized in that: The positioning plate (10) has two symmetrical docking slots at both ends, and the lower end of the side plate (11) is provided with a connecting rod (12) that is inserted into the docking slot. The connecting rod (12) slides with the positioning plate (10). Two positioning holes (15) are symmetrically arranged at both ends of the cylindrical rod (13). A rectangular rod (16) is inserted into the positioning hole (15) at the lower end of the positioning seat (14). The rectangular rod (16) is slidably engaged with the cylindrical rod (13). A second groove (24) is provided at the upper end of the positioning seat (14). A rotating shaft (17) is provided in the second groove (24). The rotating shaft (17) passes through the positioning seat (14) and is inserted into the cylindrical rod (13). The rotating shaft (17) is rotatably connected to the positioning seat (14). A threaded rod is provided at the lower end of the rotating shaft (17). The threaded rod is inserted into the cylindrical rod (13) and is threadedly connected to the cylindrical rod (13).

5. A prefabricated confined concrete vibration damping structure according to claim 4, characterized in that: The connecting rod (12) fits tightly with the docking groove, and the rectangular rod (16) fits tightly with the positioning hole (15).

6. A prefabricated confined concrete vibration damping structure according to claim 5, characterized in that: The positioning seat (14) is inlaid with a bearing, and the inner ring of the bearing is penetrated by a rotating shaft (17). The upper end of the rotating shaft (17) is provided with a knob, which is located inside the second groove (24) and has a cross groove.

7. A prefabricated confined concrete vibration damping structure according to claim 6, characterized in that: The front end of the shock absorber (23) is fixed to the rear end of the side plate (11) by screws.

8. A prefabricated confined concrete vibration damping structure according to claim 7, characterized in that: There is frictional resistance between the annular sleeve (19) and the cylindrical rod (13), and there is frictional resistance between the threaded rod and the cylindrical rod (13).

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