VIBRATION-DAMPING STRUCTURE BASED ON DOUBLE-LAYER PLATE

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of China application serial no. 202411985994.7, filed on December 31, 2024. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND

Technical Field

The present disclosure relates to the technical field of vibration-damping structures, and in particular, to a vibration-damping structure based on a double-layer plate.

Description of Related Art

As an emerging urban public transportation system, subways greatly improve the efficiency of citizens’ daily travel and make significant contributions to urban economic development. Due to the fact that subway operation tends to cause environmental vibration and secondary noise pollution in the surrounding areas, people living in buildings above subways often face certain health issues, making environmental vibration isolation for buildings above subways an urgent need.

Currently, the main vibration-damping technical measures used in buildings include building vibration isolation bearings, floating floors, and foundation vibration-damping pads. Among them, the building vibration isolation bearings are suitable for buildings with low structural heights. When the structural height is relatively high, it is difficult to control the structural overturning effect, and the bearing capacity of the bearings is often insufficient. The construction of floating floors is relatively complex. When most spaces require vibration and noise reduction, the construction workload is enormous. Additionally, due to the need for a certain structural thickness, the building area and net height are reduced, thereby affecting the building space.

Disclosed in Chinese Patent Application No. CN210342302U is a prefabricated building vibration-damping mechanism, including a top plate, where a bottom plate is mounted at the bottom of the top plate, a vibration-damping pad is mounted between the top plate and the bottom plate, and the vibration-damping pad is connected to the top plate and the bottom plate via a protective layer. The vibration-damping structure in this patent is complex and cannot effectively cut off a vibration transmission path.

Therefore, providing a vibration-damping structure capable of effectively cutting off the vibration transmission path is an urgent problem to be solved.

SUMMARY

An objective of the present disclosure is to provide a vibration-damping structure based on a double-layer plate, so as to overcome the above defects in the prior art.

The objective of the present disclosure can be achieved by the following technical solution:

According to one aspect of the present disclosure, a vibration-damping structure based on a double-layer plate is provided, including a lower bottom plate, an upper bottom plate, connecting mechanisms, a vibration-damping pad, and a vibration-damping pad protective layer, where the lower bottom plate is provided with a groove, the vibration-damping pad and the vibration-damping pad protective layer are sequentially mounted in the groove, and the upper bottom plate is mounted in the groove via the connecting mechanisms.

As a preferred technical solution, the vibration-damping pad is mounted between the vibration-damping pad protective layer and the lower bottom plate.

As a preferred technical solution, the connecting mechanism includes a high-strength bolt, a rubber cushion layer, and a first sleeve mounted in the upper bottom plate, where the high-strength bolt and the rubber cushion layer are mounted in the first sleeve.

As a preferred technical solution, the high-strength bolt is a non-full-thread high-strength bolt, and an unthreaded part of the high-strength bolt is mounted in the rubber cushion layer.

As a preferred technical solution, the high-strength bolt penetrates through the upper bottom plate, the vibration-damping pad, and the vibration-damping pad protective layer.

As a preferred technical solution, the connecting mechanism further includes a second sleeve and an anchor bar which are mounted on the lower bottom plate and are connected via a thread.

As a preferred technical solution, the high-strength bolt is threadedly connected to the second sleeve.

As a preferred technical solution, the connecting mechanism further includes an anchor plate mounted on the lower bottom plate and connected to the anchor bar.

As a preferred technical solution, the structure further includes a vertical member and vertical piles, where the vertical member is mounted on the upper bottom plate, and the vertical piles are mounted on the lower bottom plate.

The structure further includes a concrete cushion layer mounted on the lower bottom plate.

Compared with the prior art, the present disclosure has the following beneficial effects.

1. In the present disclosure, the vibration-damping pad is disposed between the upper bottom plate and the lower bottom plate, which can effectively cut off a transmission path of rail transit vibration from foundation soil to the vertical piles and the upper and lower bottom plates, and further to an upper main structure, thereby achieving more effective vibration control, and reducing impact of the rail transit vibration on the upper structure.

2. In the present disclosure, the vibration-damping pad protective layer is further provided to prevent damage to the vibration-damping pad during construction of the upper bottom plate.

3. In the present disclosure, the upper bottom plate is connected to the lower bottom plate via the high-strength bolts, which can effectively transmit the bending moment and tensile force from the upper structure to the lower bottom plate; and the pressure and shear force of the upper structure can be directly transmitted through contact between the upper bottom plate, the vibration-damping pad, and the lower bottom plate of a foundation.

4. In the present disclosure, a pre-tightening force can be applied by the high-strength bolts to pre-compress the vibration-damping pad, so as to reduce deformation of the vibration-damping pad during construction, and further mitigate adverse stress on the upper structure caused by uneven settlement.

5. In the present disclosure, the concrete cushion layer is further provided, which is mounted on the lower bottom plate to protect the lower bottom plate during mounting.

6. In the present disclosure, the vertical member and the vertical piles are further provided. The vertical member is integrally cast with the upper bottom plate, and the lower bottom plate is integrally cast with the vertical piles. The positioning and mounting of the structure are completed through the vertical member and the vertical piles.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of a structure in the present disclosure;

FIG. 2 is a partial enlarged view of a joint between a lower bottom plate and an upper bottom plate in the present disclosure; and

FIG. 3 is a schematic diagram of an overall structure of the present disclosure.

DESCRIPTION OF THE EMBODIMENTS

The technical solutions in the embodiments of the present disclosure are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely some rather than all of the embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present disclosure.

As an emerging urban public transportation system, subways greatly improve the efficiency of citizens’ daily travel and make significant contributions to urban economic development. Due to the fact that subway operation tends to cause environmental vibration and secondary noise pollution in the surrounding areas, people living in buildings above subways often face certain health issues, making environmental vibration isolation for buildings above subways an urgent need.

Currently, the main vibration-damping technical measures used in buildings include building vibration isolation bearings, floating floors, and foundation vibration-damping pads. Among them, the building vibration isolation bearings are suitable for buildings with low structural heights. When the structural height is relatively high, it is difficult to control the structural overturning effect, and the bearing capacity of the bearings is often insufficient. The construction of floating floors is relatively complex. When most spaces require vibration and noise reduction, the construction workload is enormous. Additionally, due to the need for a certain structural thickness, the building area and net height are reduced, thereby affecting the building space. The foundation vibration-damping pads have little impact on the upper structure. However, when a pile foundation is used, the main challenge in vibration control and structural design is how to maintain the integrity of the pile foundation under load while effectively isolating subway vibration from being transmitted to the upper structure through the pile foundation.

In view of the above problems, the present disclosure provides a vibration-damping structure based on a double-layer plate. In the present disclosure, the vibration-damping pad is disposed between the upper bottom plate and the lower bottom plate, which can effectively cut off a transmission path of rail transit vibration from foundation soil to the vertical piles and the upper and lower bottom plates, and further to an upper main structure, thereby achieving more effective vibration control, and reducing impact of the rail transit vibration on the upper structure. In the present disclosure, the vibration-damping pad protective layer is further provided to prevent damage to the vibration-damping pad during construction of the upper bottom plate. In the present disclosure, the upper bottom plate is connected to the lower bottom plate via the high-strength bolts, which can effectively transmit the bending moment and tensile force from the upper structure to the lower bottom plate; and the pressure and shear force of the upper structure can be directly transmitted through contact between the upper bottom plate, the vibration-damping pad, and the lower bottom plate of a foundation. In the present disclosure, a pre-tightening force can be applied by the high-strength bolts to pre-compress the vibration-damping pad, so as to reduce deformation of the vibration-damping pad during construction, and further mitigate adverse stress on the upper structure caused by uneven settlement. In the present disclosure, the concrete cushion layer is further provided, which is mounted on the lower bottom plate to protect the lower bottom plate during mounting. In the present disclosure, the vertical member and the vertical piles are further provided. The vertical member is integrally cast with the upper bottom plate, and the lower bottom plate is integrally cast with the vertical piles. The positioning and mounting of the structure are completed through the vertical member and the vertical piles.

Embodiment 1

As shown in FIGS. 1 to 3, a vibration-damping structure based on a double-layer plate includes a lower bottom plate 1, an upper bottom plate 2, connecting mechanisms, a vibration-damping pad 12, and a vibration-damping pad protective layer 13, where the lower bottom plate 1 is provided with a groove, the vibration-damping pad 12 and the vibration-damping pad protective layer 13 are sequentially mounted in the groove, and the upper bottom plate 2 is mounted in the groove via the connecting mechanisms.

The vibration-damping pad 12 is mounted between the vibration-damping pad protective layer 13 and the lower bottom plate 1.

In this embodiment, the top of the lower bottom plate 1 is provided with the groove, which matches in shape and dimension with the upper bottom plate 2. The bottom and side surfaces of the groove are fully covered with the vibration-damping pad 12, which is made from a polyurethane material. The thickness and material of the vibration-damping pad 12 can be designed according to vibration-damping requirements. Both the upper surface and side surfaces of the vibration-damping pad 12 are cast with the vibration-damping pad protective layer 13, which is formed by pouring fine aggregate concrete, to prevent damage to the polyurethane vibration-damping pad during construction of the upper bottom plate of a foundation.

The connecting mechanism includes a high-strength bolt 5, a rubber cushion layer 6, and a first sleeve 7, where the first sleeve 7 is mounted in the upper bottom plate 2, and the high-strength bolt 5 and the rubber cushion layer 6 are mounted in the first sleeve 7.

The high-strength bolt 5 is a non-full-thread high-strength bolt 5, and an unthreaded part of the high-strength bolt 5 is mounted in the rubber cushion layer 6.

The high-strength bolt 5 penetrates through the upper bottom plate 2, the vibration-damping pad 12, and the vibration-damping pad protective layer 13.

The connecting mechanism further includes a second sleeve 8 and an anchor bar 9 which are mounted on the lower bottom plate 1 and are connected via a thread.

The high-strength bolt 5 is threadedly connected to the second sleeve 8.

The connecting mechanism further includes an anchor plate 10 mounted on the lower bottom plate 1 and connected to the anchor bar 9.

In this embodiment, the first sleeve 7 is a PVC sleeve, and the second sleeve 8 is a steel sleeve. The PVC sleeve is pre-embedded in the upper bottom plate 2 and penetrates through both an upper surface and a lower surface of the upper bottom plate 2 of the foundation. The steel sleeve and the anchor bar 9 are pre-embedded in the lower bottom plate 1. An upper end of the anchor bar 9 is provided with a thread and is connected to a lower end of the steel sleeve via the thread. The PVC sleeve is aligned with the steel sleeve pre-embedded in the lower bottom plate 1 in terms of planar position.

The high-strength bolt 5 is a non-full-thread high-strength bolt 5, which can be sequentially subdivided into a nut, a non-thread section, and a thread, with the nut at an upper end and the thread at a lower end. The non-thread section of the high-strength bolt 5 is covered with a rubber cushion layer 6 to reduce vibration transmission with the PVC sleeve. The high-strength bolt 5 passes through the PVC sleeve. The thread of the high-strength bolt 5 is connected to the steel sleeve pre-embedded in the lower bottom plate 1. After concrete pouring for the upper bottom plate 2 and the lower bottom plate 1 is completed and strength is achieved, a torque is applied to the nut of the high-strength bolt 5 to apply a pre-tightening force between the upper bottom plate 2 and the lower bottom plate 1. The pre-tightening force can be controlled according to the pre-deformation requirements by adjusting the applied torque. The rubber cushion layer 6 is disposed at a position where the nut is in contact with the upper bottom plate 2, to reduce vibration transmission. The number and arrangement positions of high-strength bolts 5 are determined according to the requirements for the pre-tightening force and the transmission requirements for the bending moment and axial force of the vertical member. The upper bottom plate 2 and the lower bottom plate 1 are connected via the high-strength bolts 5. On the one hand, the pre-tightening force can be applied to pre-compress the vibration-damping pad 12 so as to reduce deformation of the vibration-damping pad 12 during construction; and on the other hand, the high-strength bolts 5 can effectively meet the transmission requirements for the bending moment and tensile force that may exist in the vertical member.

The lower bottom plate 1 is further provided with the anchor plates 10, which are connected to the anchor bars 9 via welding or threads. The second sleeve 8 (i.e., the steel sleeve) is more firmly mounted on the lower bottom plate 1 under the action of the anchor plate 10 and the anchor bar 9.

The structure further includes a vertical member 3 and vertical piles 4, where the vertical member 3 is mounted on the upper bottom plate 2, and the vertical piles 4 are mounted on the lower bottom plate 1.

In this embodiment, the vertical member 3 is integrally cast with the upper bottom plate 2, and the lower bottom plate 1 is integrally cast with the vertical piles 4. The lower bottom plate 1 and the vertical piles 4 are still stressed as a whole, and can maintain a good overall stress state and anti-floating performance. The vertical piles 4, the lower bottom plate 1, and the vertical member 3 are completely isolated from each other by the vibration-damping pad 12, thereby cutting off a transmission path of rail transit vibration from foundation soil to the vertical piles 4 and the upper and lower bottom plates, and further to an upper main structure.

The structure further includes a concrete cushion layer 11 mounted on the lower bottom plate 1.

In this embodiment, the concrete cushion layer 11 is provided to protect the lower bottom plate 1 during mounting of the lower bottom plate 1.

The above descriptions are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited to this. Any of those skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope of the present disclosure, and these modifications or substitutions shall all be included within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined based on the scope of protection of the claims.