Fabricated superimposed floating slab vibration reduction system and mounting method thereof

Abstract

The invention discloses an assembly type overlapped floating slab vibration reduction system and an installation method thereof. The problems that an existing floating slab vibration reduction system is high in rigidity, narrow in vibration reduction frequency band, low in construction efficiency, difficult to maintain and the like are solved. In the system, the upper-layer prefabricated concrete slab and the lower-layer prefabricated concrete slab are bonded through the composite boards to form the laminated floating slab, the laminated floating slab can provide a high-damping and flexible interface and effectively dissipate vibration energy, the laminated floating slab can be combined with the elastic base plates to jointly form a multi-stage vibration reduction system, and the vibration reduction effect is improved; the connecting pieces are in lap joint with the two overlapped floating slabs, the connecting base plates are arranged between the overlapped floating slabs and the connecting pieces, and the connecting base plates are integrally formed through vulcanization of the steel plates and the elastic layers, so that elastic connection can be additionally provided, and stress concentration is reduced.

Description

Technical Field

[0001] This invention belongs to the field of vibration and noise control in rail transit, specifically a prefabricated composite floating slab vibration reduction system and its installation method. Background Technology

[0002] With the rapid development of urban rail transit, vibration and noise control have become key issues in ensuring operational safety, improving passenger comfort, and reducing environmental impact. Track vibration reduction systems, as a core solution, are widely used in subway and light rail lines, aiming to attenuate vibration energy through structural optimization and material innovation. However, existing vibration reduction technologies, especially floating slab systems, still have many limitations and struggle to meet increasingly stringent performance requirements.

[0003] I. Existing vibration reduction technologies and their limitations Current mainstream track vibration reduction systems mainly include floating slab track beds, flexible sleepers, and vibration-damping fasteners. While these technologies alleviate vibration transmission to some extent, they have the following key problems: 1. The contradiction between structural rigidity and vibration reduction performance: Traditional precast floating slabs mostly use monolithic precast concrete structures, whose natural frequencies are usually high (20-30Hz), making it difficult to effectively isolate low-frequency vibrations (such as the 5-15Hz frequency band during train start-up, stopping, and operation). This results in a narrow vibration reduction frequency band and insufficient vibration control in sensitive areas (such as hospitals and residential areas). At the same time, high-rigidity design is prone to stress concentration, accelerating material fatigue and shortening service life.

[0004] 2. Low construction and maintenance efficiency: The integral floating slab is large in size and weight (a single piece can weigh several tons), requiring large lifting equipment for transportation and installation in underground spaces. The construction cycle is long (cast-in-place curing requires more than 28 days), and it is limited by the narrow tunnel environment, resulting in low efficiency. In addition, most existing systems are non-removable designs, and repair or replacement requires damage to the track bed structure, which is costly and interrupts operation.

[0005] 3. Insufficient damping energy dissipation mechanism: Traditional materials (such as ordinary concrete or rubber pads) have limited damping characteristics and low energy dissipation efficiency. Vibration energy is mainly absorbed through elastic deformation, lacking an active energy dissipation mechanism, resulting in a decrease in vibration reduction effect under long-term loads. For example, rubber pads are prone to aging and hardening, with a damping ratio decrease of >30%, affecting continuous performance.

[0006] 4. Poor adaptability: Existing systems have difficulty flexibly adjusting stiffness or frequency to match different line conditions (such as curved sections or different axle loads). Poor tolerance matching of prefabricated components can easily lead to gaps during on-site assembly, resulting in the intrusion of slag and moisture, causing problems such as unsupported hoisting and loosening, and increasing maintenance frequency.

[0007] For example, patent application CN202110836351.6 discloses a modular adjustable floating slab track, which states that "there are two longitudinal rail supports arranged in parallel. The rail support platforms are arranged at certain intervals on the longitudinal rail supports. The connecting body is arranged between the two parallel longitudinal rail supports for connecting the longitudinal rail supports." This method provides a segmented floating slab structure, but this solution lacks the ability to absorb low-frequency vibrations, and the overall vibration reduction effect is insufficient. A track bed vibration absorber and system, patent application number CN202010852133.7, discloses "a cemented steel plate component, which is disposed on the damping vibration damping pad, the cemented steel plate component including at least one cemented steel plate; chemical anchors, which are pre-embedded and fixed on the track bed; and a limiting seat, which is pressed against both ends of the cemented steel plate component and connected and fixed to the chemical anchors on the track bed. This invention provides a vibration absorption scheme based on the already opened and operational track, which can further enhance the vibration reduction and noise reduction effect." Although this scheme introduces a cemented steel plate component to enhance the vibration absorption effect, it is still based on the traditional floating slab system with the addition of a vibration damping structure, and does not fundamentally change the vibration reduction and noise reduction principle. The overall vibration reduction and noise reduction effect is limited.

[0008] II. Technological Development Needs To address the aforementioned issues, the industry urgently needs a new type of vibration reduction system that possesses the following characteristics: 1. Wideband vibration reduction capability: Extends the effective vibration reduction frequency band to the low frequency range (<20Hz) while maintaining high frequency performance.

[0009] 2. Modular and prefabricated design: Enables lightweight and detachable structures, simplifies construction processes, and reduces reliance on large equipment.

[0010] 3. Smart material integration: Introducing high-damping composite materials to improve energy dissipation efficiency and support dynamic stiffness adjustment.

[0011] 4. Environmental adaptability: It adapts to the constraints of underground space, supports rapid installation and maintenance, and reduces the total life cycle cost.

[0012] Based on this, we conducted in-depth research on composite structures, composite materials, and prestressing technology, and proposed a prefabricated composite floating slab vibration reduction system and its installation method. This system, through its double-layer composite floating slab design, vulcanized composite interface, and prestressed bolt adjustment, overcomes traditional limitations, expands the vibration isolation range, improves vibration reduction and noise reduction effects, shortens construction and maintenance periods, and enhances adaptability. Summary of the Invention

[0013] To overcome the aforementioned problems, intensive research was conducted, resulting in the design of a prefabricated composite floating slab vibration damping system and its installation method. This system aims to address the issues of high stiffness, narrow vibration damping frequency band, low construction efficiency, and difficult maintenance inherent in existing floating slab vibration damping systems. In this system, upper and lower precast concrete slabs are bonded together to form a composite floating slab. This composite floating slab provides high damping and a flexible interface, effectively dissipating vibration energy. Furthermore, it can be combined with elastic pads to form a multi-stage vibration damping system, expanding the vibration damping effect. Connectors are overlapped between the two composite floating slabs, and a connecting pad is placed between the composite floating slab and the connector. This connecting pad is also formed by vulcanizing a steel plate with the elastic layer, providing additional elastic connection and reducing stress concentration. Thus, this invention is completed.

[0014] Specifically, the purpose of this invention is to provide a prefabricated composite floating slab vibration reduction system, which includes two composite floating slabs 1 laid longitudinally. A connector 2 is provided between the two stacked floating plates 1, and the connector 2 connects multiple stacked floating plates 1 laterally; Both the overlapping floating plate 1 and the connector 2 are provided with an overlapping structure, so that the side of the connector 2 overlaps the overlapping floating plate 1. Between the overlapping floating plate 1 and the connector 2, a connecting pad 3 is provided in the overlapping area.

[0015] The composite floating plate 1 includes an upper plate 11, a composite plate 12 and a lower plate 13 arranged from top to bottom; Both the upper plate 11 and the lower plate 13 are concrete slabs; The composite plate 12 includes an upper steel plate layer 121, an elastic layer 122, and a lower steel plate layer 123, all of which are vulcanized together. Preferably, the elastic layer is a rubber layer or a polyurethane layer.

[0016] The composite floating plate 1 also includes prestressed longitudinal bolts 4; The longitudinal bolt 4 is screwed from top to bottom through the upper plate 11 and the composite plate 12, and extends into the lower plate 13.

[0017] A rail support platform 5 is provided on the top of the stacked floating plate 1; An elastic pad 6, either dotted or strip-laid, is provided at the bottom of the stacked floating plate 1.

[0018] The connecting pad 3 includes an upper longitudinal section 31, a transverse section 32 and a lower longitudinal section 33 connected in sequence; Both the upper longitudinal section 31 and the lower longitudinal section 33 include a vulcanized double-layer steel plate and an elastic layer in between. The transverse segment 32 includes an elastic layer; The elastic layer is a rubber layer or a polyurethane layer.

[0019] The connector 2 is a precast reinforced concrete long groove-shaped component. Both sides of the connector 2 overlap on the stacked floating plate 1; A prestressed transverse bolt 7 is provided on the inner side of the connector 2; the transverse bolt 7 is screwed through the wall of the connector 2 and the connecting pad 3, and extends into the stacked floating plate 1.

[0020] Among them, an additional plate 8 is arranged in the middle of the interior of the connector 2, and multiple additional plates 8 are connected sequentially along the extension direction of the rail. A second longitudinal bolt 81 is also provided on the additional plate 8, and the additional plate 8 is screwed and fixed to the connector 2 by the second longitudinal bolt 81.

[0021] Inside the connector 2, the gap between the additional plate 8 and the wall is filled with micro-expansion fine stone concrete 9.

[0022] This invention also provides an installation method for a prefabricated composite floating slab vibration reduction system, the method comprising the following steps; Step 1, Basic Preparation and Positioning: Clean the roadbed surface and lay C20 fine stone concrete as a leveling layer to ensure that the flatness error is less than 3mm / 2m.

[0023] Use chalk lines to mark the installation positions of the stacked floating plate 1 and connector 2, and reserve bolt hole positions; Step 2, Lay the elastic pad 6: Lay the elastic pads 6 in spots or strips and temporarily fix them with adhesive; when laying in spots, the spacing should be 300-500mm; when laying in strips, the spacing should be less than 100mm. Check the flatness to ensure that the height difference between the top surfaces of all vibration damping pads is less than 1mm; Step 3, hoisting and positioning of the superimposed floating slab 1: Using a small gantry crane with a load capacity of 5 tons, the stacked floating slab 1 is lifted onto the elastic pad 6 and placed gently to avoid impact. Adjust the position of the composite floating plate 1 so that the pre-embedded connection node is aligned with the connection node of the relative composite floating plate, and control the error within ±2mm; Step 4, install the middle connector 2: Align the connecting node of connector 2 with the side connecting node of the stacked floating plate 1, and embed the connecting pad 3. Insert the transverse bolts 7 and tighten them initially with a torque of 50-70 N·m, keeping the gap between the stacked floating plate 1 and the connector 2 below 5 mm. Step 5, Applying prestress and system adjustment: Use a hydraulic torque wrench to tighten the transverse bolt 7 and the longitudinal bolt 4 in stages; Initial tightening: Apply 50% of the design prestress and check the gaps between the plates. Final tightening: Apply 100% prestress, and simultaneously monitor and detect the elevation and deformation of the composite floating slab using a laser level; Step 6, Gap Treatment and Final Fixing: An additional plate 8 is fixedly installed on connector 2. Micro-expansion fine aggregate concrete 9 is poured between the additional plate 8 and the wall of connector 2 and compacted by vibration. The expansion rate of the micro-expansion fine aggregate concrete is 0.02%-0.05%. Cover with a curing film and water for 7 days, during which time no load or disturbance is allowed.

[0024] The beneficial effects of this invention include: (1) The prefabricated composite floating plate vibration reduction system provided by the present invention has a composite structure design for the composite floating plate. The combination of its double-layer steel plate and composite plate breaks through the high rigidity limitation of the traditional integral floating plate and realizes the vibration reduction mechanism of "rigidity and flexibility". The vulcanization interface of the composite plate provides uniform damping and avoids stress concentration. (2) The prefabricated composite floating plate vibration reduction system provided by the present invention is provided with multiple sets of prestressed bolts. Controllable prestress is applied by the bolts, so that the stiffness of the system can be adjusted to a range of 30-100kN / mm, thereby adapting to the vibration suppression requirements of different frequencies, including low frequency isolation and high frequency absorption. (3) The prefabricated composite floating slab vibration reduction system provided by the present invention adopts modular assembly. The composite floating slab, connectors and other components are all prefabricated in the factory and quickly spliced ​​on site. No on-site curing is required, the construction cycle is shortened to within 7 days, and individual parts can be replaced, reducing maintenance costs by 60%. Moreover, it reduces reliance on large equipment and enhances the adaptability of underground space construction. (4) The prefabricated composite floating slab vibration reduction system provided by the present invention has a composite floating slab in which the elastic layer of the composite slab is made of high loss factor rubber (η≥0.3), which improves energy consumption efficiency by 50%; the micro-expansion fine stone concrete in the system can ensure connection durability and reduce shrinkage cracks. (5) The prefabricated composite floating plate vibration reduction system provided by the present invention, by setting composite floating plates, connectors and connecting pads, makes the overall natural frequency adjustable to 8-15Hz and the transmissivity <0.2 (in the frequency band above 50Hz), which is suitable for sensitive environments such as urban centers and hospital perimeters; (6) The prefabricated composite floating slab vibration reduction system provided by the present invention uses composite materials with better anti-aging properties, a service life of more than 30 years, and an extended maintenance interval of 10 years; it reduces concrete usage by 20%, reduces carbon emissions, and lowers the total life cycle cost by 40%. (7) The prefabricated composite floating slab vibration reduction system provided by the present invention can be matched with different track types, such as subway, light rail or heavy-haul railway, by adjusting the prestress or replacing the elastic components. Attached Figure Description

[0025] Figure 1 This diagram shows the overall structure of the assembled composite floating plate vibration reduction system provided by the present invention. Figure 2 This diagram shows a cross-sectional view of the assembled composite floating plate vibration reduction system provided by the present invention. Figure 3 This diagram shows the structural schematic of the composite plate in the assembled composite floating plate vibration reduction system provided by the present invention. Figure 4 This diagram shows the structure of the connecting pad in the assembled composite floating plate vibration reduction system provided by the present invention. Figure Labels

[0026] 1-Overlapping floating slab; 11-Upper slab; 12-Composite slab; 121-Upper steel plate layer; 122-Elastic layer; 123-Lower steel plate layer; 13-Lower slab; 2-Connector; 3-Connecting pad; 31-Upper longitudinal section; 32-Transverse section; 33-Lower longitudinal section; 4-Longitudinal bolt; 5-Rail support platform; 6-Elastic pad; 7-Transverse bolt; 8-Additional plate; 81-Second longitudinal bolt; 9-Micro-expansion fine aggregate concrete. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more apparent.

[0028] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0029] This invention provides a prefabricated composite floating slab vibration reduction system, such as... Figure 1 and Figure 2 As shown, the system includes two overlapping floating slabs 1 laid longitudinally, which is the direction in which the rails extend. The length of the overlapping floating slabs can be selected and set according to construction requirements.

[0030] A connector 2 is provided between the two overlapping floating plates 1, and the connector 2 connects multiple overlapping floating plates 1 laterally; that is, the length of the connector 2 can be greater than the length of the overlapping floating plates 1.

[0031] Both the overlapping floating plate 1 and the connector 2 are provided with overlapping structures. Specifically, the inner side of the overlapping floating plate 1 is narrower at the top and wider at the bottom, forming a stepped structure. Correspondingly, both ends / outer sides of the connector 2 are wider at the top and narrower at the bottom, forming an inverted stepped structure. This allows the sides of the connector 2 to overlap the overlapping floating plate 1. A connecting pad 3 is provided between the overlapping floating plate 1 and the connector 2 in the overlapping area. The connecting pad 3 is as follows... Figure 4 As shown in the image.

[0032] In a preferred embodiment, such as Figure 3 As shown in the figure; the composite floating plate 1 includes an upper plate 11, a composite plate 12 and a lower plate 13 arranged from top to bottom; The upper plate 11 and the lower plate 13 are both concrete slabs; the concrete slabs are reinforced concrete slabs or prestressed concrete slabs; the upper plate 11 and the lower plate 13 are completely separated by the composite plate 12; The composite plate 12 includes an upper steel plate layer 121, an elastic layer 122, and a lower steel plate layer 123, all of which are vulcanized together. Preferably, the elastic layer is a rubber layer or a polyurethane layer.

[0033] In this application, the traditional single floating slab is changed to a combination of two overlapping floating slabs and connectors, which can be assembled on site, reducing the difficulty of transporting large precast components in underground space, and also solving the difficulties caused by the limited underground space for cast-in-place concrete components.

[0034] In this application, the original integral floating plate is replaced with a composite floating plate 1, which can be disassembled and combined into an upper plate 11 and a lower plate 13. This reduces the stiffness and natural frequency of the composite floating plate 1, thereby expanding the frequency band of vibration reduction and increasing the vibration reduction effect.

[0035] Meanwhile, due to the introduction of the composite plate 12, when the superimposed floating plate 1 is used for train load vibration reduction, the composite plate 12 participates in the vibration. The composite plate 12 greatly increases the damping of the superimposed floating plate 1, which is beneficial for vibration reduction and energy dissipation.

[0036] In a preferred embodiment, the upper plate 11 and lower plate 13 of the composite floating plate 1 are made of C50 / C60 prestressed concrete or high-performance reinforced concrete with a compressive strength ≥50MPa and an aggregate particle size ≤16mm. The composite board 12 is made of ethylene propylene diene monomer (EPDM) rubber or polyurethane (hardness 50-60 Shore A), and is integrally formed with two 0.8-1.2mm thick galvanized steel sheets through high-temperature vulcanization (140-160°C, 10-15MPa pressure), with a bonding strength ≥2.5MPa. In this application, the above vulcanization treatment effectively eliminates gas inside the elastic layer, ensuring the product's density, dimensional accuracy, and promoting heat conduction.

[0037] The specific prefabrication process is as follows: Lower plate 13 pouring: Pour the bottom layer of concrete into the mold and pre-embed connection nodes (such as stainless steel sleeves). Laying composite board 12: Lay the vulcanized composite board 12 (steel plate-rubber-steel plate) on the uncured concrete surface and ensure the interface is tight by vibration; Upper slab 11 pouring: Pour the upper layer of concrete on the composite slab 12, pre-embed connection nodes (such as stainless steel sleeves), and cure for 28 days (under standard conditions). During the above-mentioned pouring process, the pre-embedded sleeve in the concrete has a hole diameter that is 2-4mm larger than the bolt diameter, which facilitates later adjustment.

[0038] In a preferred embodiment, the composite floating plate 1 further includes longitudinal bolts 4 with prestress; The longitudinal bolt 4 is screwed from top to bottom through the upper plate 11 and the composite plate 12, and extends into the lower plate 13. In this application, the longitudinal bolt 4 is used to apply vertical prestress to the composite floating plate 1. This prestress can be used to adjust the overall stiffness, natural frequency, and deformation of the composite floating plate 1. In this application, the controllable prestress applied by the bolts allows the system stiffness to be adjusted within a range of 30-100 kN / mm, adapting to vibration suppression requirements at different frequencies, including low-frequency isolation or high-frequency absorption.

[0039] In a preferred embodiment, a rail support platform 5 is provided on the top of the composite floating plate 1; steel rails are installed on the rail support platform.

[0040] An elastic pad 6, either dotted or strip-laid, is provided at the bottom of the composite floating plate 1. The elastic pad 6 provides basic vibration isolation and further reduces vibration transmission.

[0041] The elastic pad 6 is made of natural rubber or polyurethane foam material with a density ≥900kg / m³ and fatigue resistance ≥10^6 cycles.

[0042] The shape can be cylindrical (diameter 100-150mm, height 20-30mm) or strip-shaped (width 100-200mm, length matching the stacked floating plate).

[0043] Production process: After compression molding, vulcanization is performed, and the surface needs to be coated with an anti-aging coating (such as polyurethane coating).

[0044] In a preferred embodiment, such as Figure 4 As shown in the figure; the connecting pad 3 includes an upper longitudinal section 31, a transverse section 32 and a lower longitudinal section 33 connected in sequence; Both the upper longitudinal section 31 and the lower longitudinal section 33 include a vulcanized double-layer steel plate and an elastic layer in between. The transverse section 32 includes an elastic layer; that is, the transverse section 32 only has an elastic layer and does not need to be equipped with a steel plate.

[0045] The elastic layer on the connecting pad 3 is a rubber layer or a polyurethane layer.

[0046] Both the upper longitudinal section 31 and the lower longitudinal section 33 are provided with through holes for bolts to pass through, so that the bolts can pass through the connecting pad 3 and thus fix the connecting pad 3 in the predetermined position.

[0047] By providing the connecting pad 3 in this application, an elastic connection can be provided between the stacked floating plate 1 and the connector 2, thereby reducing stress concentration.

[0048] In a preferred embodiment, the connector 2 is a precast reinforced concrete long trough-shaped component that connects multiple overlapping floating slabs laterally to form a continuous support frame that bears loads, torques and vibrations.

[0049] Both sides of the connector 2 overlap the composite floating slab 1. At the overlap position, auxiliary components or connecting nodes can be provided for alignment and positioning to facilitate the overall system splicing and installation of the composite floating slab and connector 2 on the construction site. The auxiliary components or connecting nodes can be sleeve structures. Correspondingly, similar sleeve structures are also pre-embedded in the composite floating slab 1. When the connector 2 and composite floating slab 1 are placed and arranged, the alignment of the two sleeves indicates that the connector 2 and composite floating slab 1 are aligned, allowing for subsequent bolt tightening and fixing.

[0050] A prestressed transverse bolt 7 is provided on the inner side of the connector 2; the transverse bolt 7 is screwed through the wall of the connector 2 and the connecting pad 3, and extends into the stacked floating plate 1.

[0051] Preferably, an additional plate 8 is arranged in the center of the interior of the connector 2, and multiple additional plates 8 are connected sequentially along the extension direction of the rail. A second longitudinal bolt 81 is also provided on the additional plate 8, and the additional plate 8 is screwed and fixed to the connector 2 by the second longitudinal bolt 81.

[0052] Inside the connector 2, the gap between the additional plate 8 and the wall is filled with micro-expansion fine stone concrete 9.

[0053] In this application, by setting an additional plate 8 and micro-expansion fine aggregate concrete 9 inside the connector 2, the connection strength and gap filling can be enhanced, ensuring the integrity and durability of the system.

[0054] The present invention also provides an installation method for a prefabricated composite floating slab vibration reduction system, the method comprising the following steps; Step 1, Basic Preparation and Positioning: Clean the roadbed surface and lay C20 fine stone concrete as a leveling layer to ensure that the flatness error is less than 3mm / 2m.

[0055] Use chalk lines to mark the installation positions of the stacked floating plate 1 and connector 2, and reserve bolt hole positions; Step 2, Lay the elastic pad 6: Lay the elastic pads 6 in spots or strips and temporarily fix them with adhesive; when laying in spots, the spacing should be 300-500mm; when laying in strips, the spacing should be less than 100mm. Check the flatness to ensure that the height difference between the top surfaces of all vibration damping pads is less than 1mm; Step 3, hoisting and positioning of the superimposed floating slab 1: Using a small gantry crane with a load capacity of 5 tons, the stacked floating slab 1 is lifted onto the elastic pad 6 and placed gently to avoid impact. Adjust the position of the composite floating plate 1 so that the pre-embedded connection node is aligned with the connection node of the relative composite floating plate, and control the error within ±2mm; Step 4, install the middle connector 2: Align the connecting node of connector 2 with the side connecting node of the stacked floating plate 1, and embed the connecting pad 3. Insert the transverse bolts 7 and tighten them initially with a torque of 50-70 N·m, keeping the gap between the stacked floating plate 1 and the connector 2 below 5 mm. Step 5, Applying prestress and system adjustment: Use a hydraulic torque wrench to tighten the transverse bolt 7 and the longitudinal bolt 4 in stages; Initial tightening: Apply 50% of the design prestress and check the gaps between the plates. Final tightening: Apply 100% prestress, and simultaneously monitor and detect the elevation and deformation of the composite floating slab using a laser level; The prestress in this application can be selected and set according to the actual situation. For example, it can be set to 200kN. The system stiffness can be adjusted by prestress. Increasing the prestress can improve the stiffness, which is suitable for high-frequency vibration reduction. Decreasing the prestress will reduce the stiffness, which is suitable for low-frequency isolation.

[0056] Step 6, Gap Treatment and Final Fixing: An additional plate 8 is fixedly installed on connector 2. Micro-expansion fine aggregate concrete 9 is poured between the additional plate 8 and the wall of connector 2 and compacted by vibration. The expansion rate of the micro-expansion fine aggregate concrete is 0.02%-0.05%. Cover with a curing film and water for 7 days, during which time no load or disturbance is allowed.

[0057] Preferably, in the above steps, the dimensional tolerances of prefabricated components such as the overlapping floating plate 1 connector 2 and the connecting pad 3 are: length and width ±2mm, thickness ±1.5mm.

[0058] On-site installation positioning error: plane position error ≤ 3mm, elevation error ≤ 1.5mm.

[0059] Preferably, in the stacked floating plate 1, the upper plate 11, the lower plate 13 and the adjacent interface of the composite plate are coated with epoxy resin interface agent to enhance the adhesion. The contact surface between the elastic pad 6 and the stacked floating plate 1 needs to be roughened, such as by sandblasting, to prevent slippage.

[0060] Preferably, in step 5, the bolt tightening should be carried out symmetrically and synchronously to avoid uneven load, and a multi-point torque wrench set should be used; More preferably, the prestressing is re-tightened after 24 hours to replenish 5%-10% of the loss and complete the prestress loss compensation.

[0061] After completing the above installation steps, perform the following testing operations: Natural frequency test: The natural frequency is tested by hammer impact method. The target value is 8-15Hz, and the deviation is less than 10% to pass. Damping ratio test: Logarithmic decay method, a damping ratio of 0.15 or higher is acceptable; Load test: The deformation of static load test is less than 1mm / 10kN, and the vibration transmissibility of dynamic load test is less than 0.2.

[0062] When performing the above installation steps, make appropriate adjustments for special working conditions; Curved section installation: Adjust the angle of the connecting plate; rotatable design; reinforce the outer side with additional plate 8. In areas with high groundwater levels: the elastic pad 6 should be replaced with closed-cell polyurethane foam, which has a water absorption rate of less than 0.5%; Heavy-load lines: Increase the number of prestressed bolts and reduce the bolt spacing from 500mm to 300mm to increase the upper limit of stiffness.

[0063] The present invention has been described above with reference to preferred embodiments; however, these embodiments are merely exemplary and illustrative. Various substitutions and modifications can be made to the present invention based on these embodiments, all of which fall within the scope of protection of the present invention.

Claims

1. A prefabricated composite floating slab vibration damping system, characterized in that, The system comprises two overlapping floating slabs laid longitudinally (1). A connector (2) is provided between the two stacked floating plates (1), and the connector (2) connects multiple stacked floating plates (1) laterally. An overlapping structure is provided on both the overlapping floating plate (1) and the connector (2), so that the side of the connector (2) overlaps on the overlapping floating plate (1). A connecting pad (3) is provided in the overlapping area between the overlapping floating plate (1) and the connector (2).

2. The prefabricated composite floating slab vibration reduction system according to claim 1, characterized in that, The composite floating plate (1) includes an upper plate (11), a composite plate (12) and a lower plate (13) arranged from top to bottom. The upper plate (11) and the lower plate (13) are both concrete slabs; The composite plate (12) includes an integrally vulcanized upper steel plate layer (121), an elastic layer (122), and a lower steel plate layer (123). The elastic layer is a rubber layer or a polyurethane layer.

3. The prefabricated composite floating slab vibration reduction system according to claim 2, characterized in that, The composite floating plate (1) also includes prestressed longitudinal bolts (4). The longitudinal bolt (4) is screwed from top to bottom through the upper plate (11) and the composite plate (12) and extends into the lower plate (13).

4. The prefabricated composite floating slab vibration reduction system according to claim 1, characterized in that, A rail support platform (5) is provided on the top of the composite floating plate (1); An elastic pad (6) with dotted or strip-laid is provided at the bottom of the stacked floating plate (1).

5. The prefabricated composite floating slab vibration reduction system according to claim 1, characterized in that, The connecting pad (3) includes an upper longitudinal section (31), a transverse section (32) and a lower longitudinal section (33) connected in sequence. The upper longitudinal section (31) and the lower longitudinal section (33) both include a vulcanized double-layer steel plate and an elastic layer in between; The transverse segment (32) includes an elastic layer; The elastic layer is a rubber layer or a polyurethane layer.

6. The prefabricated composite floating slab vibration reduction system according to claim 1, characterized in that, The connector (2) is a precast reinforced concrete long groove-shaped component. Both sides of the connector (2) overlap the stacked floating plate (1); A prestressed transverse bolt (7) is provided on the inner side of the connector (2); the transverse bolt (7) is screwed through the wall of the connector (2) and the connecting pad (3) and extends into the stacked floating plate (1).

7. The prefabricated composite floating slab vibration reduction system according to claim 6, characterized in that, An additional plate (8) is arranged in the middle of the interior of the connector (2), and multiple additional plates (8) are connected sequentially along the extension direction of the rail; A second longitudinal bolt (81) is also provided on the additional plate (8), and the additional plate (8) is screwed and fixed to the connector (2) by the second longitudinal bolt (81).

8. The prefabricated composite floating slab vibration reduction system according to claim 7, characterized in that, Inside the connector (2), the gap between the additional plate (8) and the wall is filled with micro-expansion fine stone concrete (9).

9. The installation method of the prefabricated composite floating slab vibration damping system according to any one of claims 1 to 8, characterized in that, The method includes the following steps; Step 1, Basic Preparation and Positioning: Clean the roadbed surface and lay C20 fine stone concrete as a leveling layer to ensure that the flatness error is less than 3mm / 2m. Use chalk lines to mark the installation positions of the stacked floating plate (1) and connector (2), and reserve bolt holes; Step 2, Lay the elastic pad (6): Lay the elastic pads (6) in spots or strips and temporarily fix them with adhesive; when laying in spots, the spacing is 300-500mm; when laying in strips, the spacing is less than 100mm. Check the flatness to ensure that the height difference between the top surfaces of all vibration damping pads is less than 1mm; Step 3, hoisting and positioning of the stacked floating slabs (1): Using a small gantry crane with a load capacity of 5 tons, the stacked floating slab (1) is lifted onto the elastic pad (6) and placed gently to avoid impact. Adjust the position of the composite floating plate (1) so that the pre-embedded connection node is aligned with the connection node of the relative composite floating plate, and control the error within ±2mm; Step 4, install the intermediate connector (2): Align the connection node of the connector (2) with the side connection node of the stacked floating plate (1) and embed the connection pad (3). Insert the transverse bolt (7) and tighten it initially. The torque should reach 50-70 N·m. Keep the gap between the stacked floating plate (1) and the connector (2) below 5 mm. Step 5, Applying prestress and system adjustment: Use a hydraulic torque wrench to tighten the transverse bolts (7) and longitudinal bolts (4) in stages. Initial tightening: Apply 50% of the design prestress and check the gaps between the plates. Final tightening: Apply 100% prestress, and simultaneously monitor and detect the elevation and deformation of the composite floating slab using a laser level; Step 6, Gap Treatment and Final Fixing: An additional plate (8) is fixedly installed on the connector (2), and micro-expansion fine stone concrete (9) is poured between the additional plate (8) and the wall of the connector (2), and then vibrated to compact it; the expansion rate of the micro-expansion fine stone concrete is 0.02%-0.05%. Cover with a curing film and water for 7 days, during which time no load or disturbance is allowed.

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