A floating lane plate structure, a parameter design method thereof and a construction method thereof

Abstract

This invention provides a floating driveway slab structure, its parameter design method, and its construction method, relating to the field of construction. It comprises a mortar leveling layer, an XPS extruded polystyrene board, and a concrete surface layer arranged sequentially. The design includes: establishing a finite element model of the building structure requiring vibration reduction, simulating vehicle loads, and constructing the motion equations of the vehicle model; constructing the displacement power spectrum function of the driveway surface irregularities; predicting the dynamic response of sensitive areas within the building structure under vehicle loads before vibration reduction; parameterizing the thickness of the XPS extruded polystyrene board and the concrete surface layer; predicting the dynamic response of sensitive areas within the building structure under vehicle loads after vibration reduction; verifying the vibration reduction effect of the floating driveway slab structure; and arranging the floating driveway slab structure. This structure, design method, and construction method can be optimized for different driveway structures and vibration reduction requirements, thereby achieving the best vibration reduction effect.

Description

Technical Field

[0001] This application relates to the field of construction, and in particular to a floating roadway slab structure, its parameter design method, and its construction method. Background Technology

[0002] With the improvement of my country's economic level, developed cities have a high concentration of population and wealth, leading to increasingly scarce urban land resources. The construction of transportation hubs is gradually shifting towards a three-dimensional, intensive construction model, moving from planar expansion to prioritizing capacity and development in three-dimensional space. Furthermore, the structures are increasingly inclined towards large spans, lightweight designs, and flexibility. The structural vibrations caused by vehicles moving inside buildings are becoming increasingly pronounced. While these vibrations typically do not pose a safety hazard, they can cause discomfort, even tension and panic, affecting the daily lives of those inside – a problem known as comfort.

[0003] For example, modern bus terminals are not only public transportation hubs but also include various functional areas such as conference rooms, rest areas, and commercial and office spaces. However, vehicle-induced vibrations within the building can be transmitted through the structure to other parts of the building, affecting the normal use of other functional areas and causing discomfort to people inside. This is especially true when multiple vehicles are traveling simultaneously, as the structure may experience significant vibrations. To address this issue, appropriate measures need to be taken to reduce the transmission of vehicle-induced vibrations, ensuring the normal use of functional areas within the building and improving comfort.

[0004] Current floating slab vibration isolation schemes fail to provide a quick and effective design method for bus load vibration reduction. Furthermore, steel spring floating slab isolation schemes are commonly used for current floating slab structures. However, steel spring floating slabs have complex structures, long construction cycles, and impact project delivery schedules. Additionally, spring floating slab isolation lanes face risks of large vertical displacement and surface cracking, making quality control difficult and maintenance disrupting bus hub operations. The steel spring floating slab isolation scheme uses shear hinges to connect adjacent spring floating slabs; however, the reliability and durability of these shear hinge connections can deteriorate during use, affecting the structure's lifespan and failing to meet the vibration reduction requirements of modern building structures. Summary of the Invention

[0005] One of the purposes of this application is to provide a floating roadway slab structure, its parameter design method and construction method, which aims to solve the problem that existing floating slab vibration isolation schemes cannot meet the vibration reduction requirements of modern building structures.

[0006] The technical solution of this application is: A floating roadway slab structure includes, from bottom to top, a mortar leveling layer, an XPS extruded polystyrene board, and a concrete surface layer, which are sequentially arranged on the bottom slab of the structural layer.

[0007] As one technical solution of this application, the mortar leveling layer includes a cement mortar leveling layer or a self-leveling mortar leveling layer, and the thickness is 19-21mm; the thickness of the XPS extruded polystyrene board is 49-51mm; the concrete surface layer includes a reinforced concrete surface layer, and the thickness is 199-201mm.

[0008] As one technical solution of this application, the floating roadway structure is isolated from the road by a flexible isolation pad, which includes a polyurethane pad with a thickness of 19-21mm.

[0009] A parametric design method for a floating roadway slab structure as described above includes the following steps: Establish a finite element model of the building structure for which vibration reduction design is required, and simulate vehicle load based on a seven-degree-of-freedom spatial vehicle model to construct the motion equations of the vehicle model; Considering the surface irregularities of the driveway pavement in the building structure, a displacement power spectrum function for the roadway pavement irregularities is constructed. Predict the dynamic response of sensitive areas within the building structure under vehicle load before vibration reduction; Based on the dynamic response of the sensitive areas within the building structure before vibration reduction, the thickness of the XPS extruded polystyrene board is designed, and the concrete surface layer is designed separately. The dynamic response of the sensitive areas within the building structure under vehicle load after vibration reduction is predicted, and the vibration reduction effect of the floating driveway slab structure is verified. The floating roadway slab structure is constructed and arranged.

[0010] As one technical solution of this application, a finite element model of the building structure is established based on ANSYS, and a seven-degree-of-freedom spatial vehicle model based on multi-rigid-body dynamics is used to simulate vehicle loads. The displacement curve of the vehicle model is constructed using the following formula. This is to simulate the operating state of a vehicle and obtain the impact of the vehicle's operation on the building structure. ; In the formula: This represents the vertical displacement of the vehicle body; This refers to the vehicle body roll displacement; This refers to the vehicle body pitch displacement; The vertical displacement of the wheel is represented by the subscripts i = 1, 2, 3, 4, which represent the four wheels: left front, right front, left rear, and right rear, respectively. The displacement relationship between the vehicle body and the wheels is obtained through the following formula, which maps the vehicle body motion onto the wheels: ; In the formula: The vertical displacement of the wheel is represented by the subscripts i = 1, 2, 3, 4, which represent the four wheels: left front, right front, left rear, and right rear, respectively. This represents the vertical displacement of the vehicle body; a This is the distance from the axle to the vehicle's center of gravity. This refers to the vehicle body pitch displacement; b The track width is the distance between the front and rear axles; This refers to the vehicle body roll displacement; Based on d'Alembert's principle, the vehicle's equilibrium equations are established using the following formula to establish the dynamic relationship between forces and vehicle motion: ; ; ; ; In the formula: m b For vehicle body weight; C si and k si These represent the damping and stiffness of each suspension spring, where i = 1, 2, 3, 4; I p For pitch inertia; I r This is the moment of inertia of the roll. a This is the distance from the axle to the vehicle's center of gravity. b The track width is the distance between the front and rear axles; m w For the mass of the wheel and tire; k t For wheel and tire stiffness; The equation of motion for the vehicle is obtained from the above formula, and its matrix form is as follows: ; In the formula: , , These are the vehicle's mass, damping, and stiffness matrices, respectively. , , These are the vehicle's acceleration, velocity, and displacement vectors, respectively. This represents the load vector of the vehicle system.

[0011] As one technical solution of this application, the displacement power spectrum function of the road surface irregularities is constructed using the following formula. : ; In the formula: Spatial frequency; This is the surface roughness coefficient; As a reference spatial frequency, take ; w f For the frequency exponent, take w f =2.

[0012] As a technical solution of this application, the separation iteration method is adopted and the surface irregularity of the roadway in the building structure is considered. Numerical calculations are performed on the established vehicle model and the finite element model of the building structure to predict the dynamic response of the sensitive area in the building structure when the vehicle load is running before vibration reduction.

[0013] As a technical solution of this application, the structural layer bottom plate, the mortar leveling layer, and the concrete surface layer are all set as elastic rectangular thin plates. Based on the dynamic response of the sensitive area within the building structure before vibration reduction, the thickness parameters of the XPS extruded board are designed and simulated using the spring element Combin14 in ANSYS. The structural layer bottom plate, the mortar leveling layer, and the concrete surface layer are simplified to a surface layer, and the XPS extruded board is simplified to a spring, forming a single-degree-of-freedom system. The total stiffness and damping coefficient of the spring are designed based on the mass of the concrete surface layer and the simulated vehicle load. The separation iteration method is used to perform numerical calculations on the established vehicle model and the finite element model of the building structure after the floating driveway slab structure is arranged, predicting the dynamic response of the sensitive area within the building structure under vehicle load after vibration reduction, and verifying the vibration reduction effect of the floating driveway slab structure.

[0014] A construction method based on the above-described floating roadway slab structure includes the following steps: Pre-fabricate the concrete surface layer, and then bond the XPS extruded polystyrene board to the concrete surface layer; The bonded concrete surface layer and the XPS extruded polystyrene board assembly are transported to the construction site, and the planned paving area is inspected. The concrete surface layer and the XPS extruded polystyrene board assembly are bonded to the mortar leveling layer.

[0015] As one technical solution of this application, the XPS extruded board is bonded to the concrete surface layer by a two-component polyurethane adhesive; Before laying, check the quality of the structural layer base plate in the predetermined laying area, and lay the mortar leveling layer on the structural layer base plate. The precast concrete surface layer and the XPS extruded board assembly are bonded to the mortar leveling layer using a two-component polyurethane adhesive. During construction, a flexible isolation pad is installed between the floating roadway structure and the road for isolation. The flexible isolation pad includes a polyurethane pad with a thickness of 19-21 mm. The two-component polyurethane adhesive includes component A and component B, and the mixing mass ratio of component A to component B is 2:1 to 4:1.

[0016] The beneficial effects of this application are: (1) This application provides a floating roadway slab structure, which is designed with a bottom layer of structural layer, mortar leveling layer, XPS extruded polystyrene board and concrete surface layer arranged sequentially from bottom to top, and uses XPS extruded polystyrene board as elastic layer, so that the vibration reduction effect of the whole structure is significantly improved. It has a light overall density, good compressive strength, is easy to transport and install, and is easy to fix, which simplifies the construction process and reduces construction costs. At the same time, it can be optimized for different roadway structures and vibration reduction requirements, which can effectively reduce the transmission of vibration, thereby achieving the best vibration reduction effect.

[0017] (2) This application provides a parametric design method for a floating roadway slab structure. By establishing a finite element model of the building structure to be designed for vibration reduction and a seven-degree-of-freedom spatial vehicle model based on multi-rigid-body dynamics to simulate vehicle load, the vibration response of the target structure under the most unfavorable working condition under vehicle load can be effectively calculated. Then, based on the dynamic response of the building structure before vibration reduction, the parametric design of the floating roadway slab structure is carried out, and the structural layout that can meet the vibration reduction requirements is calculated. The floating roadway slab structure required for actual engineering can be precisely designed in a targeted manner, thereby obtaining the structural design with the best vibration reduction effect.

[0018] (3) This application provides a construction method for a floating roadway slab structure, which involves prefabricating a concrete surface layer, bonding XPS extruded polystyrene board to the concrete surface layer, transporting the bonded concrete surface layer and XPS extruded polystyrene board assembly to the construction site, inspecting the predetermined paving area, and then bonding the concrete surface layer and XPS extruded polystyrene board assembly to the mortar leveling layer, thereby simplifying the construction process and reducing construction costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the floating roadway slab structure provided in the first embodiment of this application; Figure 2 A schematic diagram of the parameter design method for the floating roadway slab structure provided in the second embodiment of this application; Figure 3 This is a schematic diagram of a finite element model of a bus station provided in the second embodiment of this application; Figure 4 This is a schematic diagram comparing the acceleration time history spectrum provided in the second embodiment of this application, wherein, Figure 4 (A) is the acceleration time history diagram. Figure 4 (B) is the acceleration spectrum diagram; Figure 5 A schematic diagram showing a 1 / 3 octave band comparison of the buoyancy vibration acceleration level provided in the fourth embodiment of this application; Figure 6 This is a schematic diagram comparing the acceleration time history spectrum provided in the fourth embodiment of this application, wherein, Figure 6 (A) is the acceleration time history diagram. Figure 6 (B) is the acceleration spectrum diagram.

[0021] Icons: 1-Structural layer base plate; 2-Mortar leveling layer; 3-XPS extruded polystyrene board; 4-Concrete surface layer; 5-Flexible isolation pad. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this application, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only used to facilitate the description of this application and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] Furthermore, in this application, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Moreover, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] First embodiment: Please refer to Figure 1 This embodiment provides a floating roadway slab structure, which mainly includes a mortar leveling layer 2, an XPS extruded polystyrene board 3, and a concrete surface layer 4, which are arranged sequentially from bottom to top on the structural layer bottom plate 1.

[0030] Furthermore, the structural floor slab 1 is specifically a reinforced concrete floor slab, the thickness of which is determined based on the structural floor slab of the area to which it is located; its mortar leveling layer 2 can be a cement mortar leveling layer 2 or a self-leveling mortar leveling layer 2, and its thickness is 19-21mm; meanwhile, its XPS extruded polystyrene board 3 has a thickness of 49-51mm; in addition, its concrete surface layer 4 can be a reinforced concrete surface layer 4, and its thickness is 199-201mm. Furthermore, a flexible isolation pad 5 is used to separate the floating driveway slab structure from the road. The flexible isolation pad 5 can be a polyurethane pad. Polyurethane material has properties between plastic and rubber, and has advantages such as oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness, and elasticity, and its thickness is 19-21mm.

[0031] Among them, XPS extruded board 3, which serves as the elastic layer, is a foamed material made by continuous extrusion foaming of polystyrene, foaming agent and other additives through an extruder. XPS extruded board 3 itself has the following advantages: (1) High material damping, which can reduce the vibration response of each frequency band and has a good vibration reduction effect; (2) Low water absorption, which makes its heat insulation effect stable, reduces aging caused by environmental factors, and its service life is almost synchronized with the building; (3) Lightweight, but high compressive strength; the conventional compressive strength is above 0.250MPa, and the highest can reach 0.500MPa, which makes it able to be used for a long time under various load environments, including pedestrian roofs, non-pedestrian roofs, parking roofs, airport runways, etc., and its physical properties are stable; (4) XPS extruded board 3 can resist the erosion of various environmental factors, including acids, alkalis, salts, etc., and ensures stable performance during long-term use.

[0032] This floating roadway slab structure is designed with a bottom-up structural layer 1, a mortar leveling layer 2, an XPS extruded polystyrene board 3, and a concrete surface layer 4, using XPS extruded polystyrene board 3 as an elastic layer. This significantly improves the vibration reduction effect of the entire structure. It has a light overall density, good compressive strength, is easy to transport and install, and is easy to fix, simplifying the construction process and reducing construction costs. At the same time, it can be optimized for different roadway structures and vibration reduction requirements, effectively reducing the transmission of vibration and thus achieving the best vibration reduction effect.

[0033] Second embodiment: Please refer to Figure 2 (Refer to) Figure 3 and Figure 4 To address the vibration comfort issue caused by indoor bus travel in bus stations, this embodiment provides a parametric design method for a floating driveway slab structure, which can effectively reduce vibration transmission and ensure the comfort of users in the functional areas. This design method includes the following steps: A finite element model of the bus station requiring vibration reduction design was established, and a seven-degree-of-freedom spatial vehicle model was used to simulate vehicle loads, constructing the vehicle model's equations of motion. Specifically, a finite element model of the bus station was established based on ANSYS, and a seven-degree-of-freedom spatial vehicle model based on multi-rigid-body dynamics was used to simulate vehicle loads. The displacement curves of the vehicle model were constructed using the following formulas. This is used to simulate the operating state of vehicles and obtain the impact of vehicle operation on building structures. ; In the formula: This refers to the vertical displacement of the bus body. This refers to the lateral tilt displacement of the bus body; The pitch displacement of the bus body; This represents the vertical displacement of the bus wheels, where the subscripts i = 1, 2, 3, 4 represent the four wheels: left front, right front, left rear, and right rear, respectively. The displacement relationship between the vehicle body and the wheels is obtained through the following formula, which maps the vehicle body motion onto the wheels: ; In the formula: The vertical displacement of the wheel is represented by the subscripts i = 1, 2, 3, 4, which represent the four wheels: left front, right front, left rear, and right rear, respectively. This represents the vertical displacement of the vehicle body; a This is the distance from the axle to the vehicle's center of gravity. This refers to the vehicle body pitch displacement; b The track width is the distance between the front and rear axles; This refers to the vehicle body roll displacement; Based on d'Alembert's principle, the vehicle's equilibrium equations are established using the following formula to establish the dynamic relationship between forces and vehicle motion: ; ; ; ; In the formula: m b For vehicle body weight; C si and k si These represent the damping and stiffness of each suspension spring, where i = 1, 2, 3, 4; I p For pitch inertia; I r This is the moment of inertia of the roll. a This is the distance from the axle to the vehicle's center of gravity. bThe track width is the distance between the front and rear axles; m w For the mass of the wheel and tire; k t For wheel and tire stiffness; The equation of motion for the vehicle is obtained from the above formula, and its matrix form is as follows: ; In the formula: , , These are the vehicle's mass, damping, and stiffness matrices, respectively. , , These are the vehicle's acceleration, velocity, and displacement vectors, respectively. This represents the load vector of the vehicle system.

[0034] Considering the surface irregularities of bus lanes in a bus station, the displacement power spectrum function of the bus lane irregularities is constructed using the following formula. : ; In the formula: Spatial frequency; This is the surface roughness coefficient; As a reference spatial frequency, take ; w f For the frequency exponent, take w f =2; Using the separation iteration method and considering the surface irregularities of the bus lane in the bus station, numerical calculations were performed on the established vehicle model and the finite element model of the bus station to predict the dynamic response of the sensitive area in the bus station under vehicle load before vibration reduction. Based on the dynamic response of sensitive areas within the bus station before vibration reduction, the thickness of XPS extruded polystyrene board 3 was parametrically designed (XPS extruded polystyrene board 3 is a high-damping vibration reduction material, which can be simulated using ANSYS finite element software), and the concrete surface layer 4 was also parametrically designed. Specifically, the structural floor slab 1, mortar leveling layer 2, and concrete surface layer 4 were all set as elastic rectangular thin plates. Based on the dynamic response of sensitive areas within the building structure before vibration reduction, the thickness parameters of XPS extruded polystyrene board 3 were determined using the Combin14 spring element in ANSYS. The design and simulation were carried out; the structural base plate 1, mortar leveling layer 2 and concrete surface layer 4 were simplified into a surface layer, and XPS extruded board 3 was simplified into a spring, which together formed a single degree of freedom system. The total stiffness and damping coefficient of the spring were designed based on the mass of concrete surface layer 4 and the simulated vehicle load; the separation iteration method was used to perform numerical calculations on the established vehicle model and the finite element model of the building structure after the floating driveway slab structure was arranged, to predict the dynamic response of the sensitive area in the building structure when the vehicle load was running after vibration reduction, and to verify the vibration reduction effect of the floating driveway slab structure. The floating roadway slab structure is constructed and arranged.

[0035] In summary, this application provides a parametric design method for a floating driveway slab structure. By establishing a finite element model of the building structure to be designed for vibration reduction and simulating vehicle loads using a seven-degree-of-freedom spatial vehicle model based on multi-rigid-body dynamics, the vibration response of the target structure under the most unfavorable working conditions under vehicle loads can be effectively calculated. Then, based on the dynamic response of the building structure before vibration reduction, the parametric design of the floating driveway slab structure is performed to calculate the structural layout that meets the vibration reduction requirements. This allows for precise design of the floating driveway slab structure required for actual engineering projects, thereby obtaining the structural design with the best vibration reduction effect.

[0036] Third embodiment: This embodiment provides a construction method based on the above-mentioned floating roadway slab structure, which mainly includes the following steps: A sufficient number of precast concrete surface layer 4 blocks are precast, and XPS extruded polystyrene boards 3 are bonded to the concrete surface layer 4 using a two-component polyurethane adhesive. The two-component polyurethane adhesive includes component A and component B, with a mixing mass ratio of component A to component B of 3:1. It is weighed and prepared strictly according to the specified 3:1 mixing ratio, following the principle of preparing and using immediately. At the same time, the single preparation amount should be 15~30kg, and it should be thoroughly mixed using a mixing device, with the mixing time controlled at 10~15 seconds. The prepared adhesive should be used up within 45 minutes, with a coating thickness not exceeding 0.5mm, and a unit area consumption of approximately 0.6kg / m². The bonded concrete surface layer 4 and XPS extruded polystyrene board 3 assembly is transported to the construction site and placed near the predetermined floating driveway slab structure. Before laying, the quality of the structural layer bottom slab 1 in the predetermined laying area is checked, and the structural layer floor slab should be laid with mortar leveling layer 2 in advance to ensure that the laying area is smooth, flat, clean, and free of residual oil stains and particles such as stones or sand that may damage the extruded polystyrene board. After ensuring the paving area meets the requirements, the precast concrete surface layer 4 and XPS extruded board 3 assembly are bonded to the mortar leveling layer 2 using a two-component polyurethane adhesive. The two-component polyurethane adhesive includes component A and component B, with a mixing ratio of 3:1. It is strictly prepared according to the specified 3:1 mixing ratio, following the principle of preparing and using immediately. The single preparation quantity should be 15-30 kg, and it should be thoroughly mixed using a mixing device for 10-15 seconds. The prepared adhesive should be used within 45 minutes, with a coating thickness not exceeding 0.5 mm and a unit area consumption of approximately 0.6 kg / m². During construction, a flexible isolation pad 5 is installed between the floating roadway structure and the road for isolation. The flexible isolation pad 5 includes a polyurethane pad with a thickness of 19-21 mm. After installation, weights can be applied to the floating roadway slab structure to ensure its flatness. The top surface of the floating roadway slab structure should be at the same height as the upper surface of the road section, with an allowable deviation of ±2 mm.

[0037] In summary, this application provides a construction method for a floating roadway slab structure. It involves prefabricating a concrete surface layer 4, bonding XPS extruded polystyrene board 3 to the concrete surface layer 4, transporting the bonded concrete surface layer 4 and XPS extruded polystyrene board 3 assembly to the construction site, inspecting the predetermined paving area, and then bonding the concrete surface layer 4 and XPS extruded polystyrene board 3 assembly to the mortar leveling layer 2. This simplifies the construction process and reduces construction costs.

[0038] Fourth embodiment: Please refer to Figure 5 (Refer to) Figure 6First, the floating driveway slab structure was constructed and arranged according to the parameter design concept provided in the second embodiment. Then, the construction was carried out on-site on the bare floor slab of the building according to the construction process proposed in the third embodiment (the fixed road section was not arranged to simplify the test process). Finally, a vehicle test was carried out on the fabricated floating driveway slab structure, using a cement truck (14.47t) to simulate the vehicle load. The dimensions of the fabricated floating driveway slab structure were 4m×40m, with XPS extruded polystyrene board 3 as the elastic layer. Accelerometers were arranged at the middle position of the floating driveway slab structure. Measuring point 1 was arranged on the upper surface of the floating driveway slab structure to measure the vibration acceleration of the upper surface of the floating driveway slab structure; measuring point 2 was arranged on the lower surface of the floating driveway slab structure to measure the vibration acceleration of the lower surface of the floating driveway slab structure. A cement mixer truck was used to drive on the test track at a speed of 20 km / h. The vibration acceleration of the upper and lower surfaces of the floating roadway slab structure under vehicle load was measured. The vibration acceleration level insertion loss in the 1 / 3 octave band center frequency range of 0~80Hz was calculated as an evaluation index of the vibration reduction effect.

[0039] The results show that the floating roadway slab structure has good vibration reduction performance in all frequency bands within the 0~80Hz range, and the economic cost is low. The comparison diagram of the 1 / 3 octave band vibration acceleration levels of the upper and lower surfaces of the floating roadway slab structure is shown below. Figure 5 As shown in the figure, the acceleration time history spectrum comparison diagrams of the upper and lower surfaces of the floating roadway slab structure are as follows: Figure 6 As shown in Table 1, the insertion loss data for the vibration acceleration level are as follows: Table 1 Insertion loss of vibration acceleration levels in each frequency band

[0040] As can be seen from the above test structure, the floating roadway slab structure and its parameter design method can effectively reduce the vertical vibration acceleration of the structure caused by bus load, and can provide a reference for vibration reduction design in the field of bus station construction.

[0041] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A floating carriageway slab structure, characterized by, It includes, from bottom to top, a mortar leveling layer, an XPS extruded polystyrene board, and a concrete surface layer, which are set on the bottom plate of the structural layer.

2. The floating bike lane slab structure of claim 1, wherein, The mortar leveling layer includes a cement mortar leveling layer or a self-leveling mortar leveling layer, and has a thickness of 19-21mm; the XPS extruded polystyrene board has a thickness of 49-51mm; the concrete surface layer includes a reinforced concrete surface layer, and has a thickness of 199-201mm.

3. The floating bike lane slab structure of claim 1, wherein, The floating roadway structure is separated from the road by a flexible isolation pad, which includes a polyurethane pad with a thickness of 19-21mm.

4. A parametric design method for the floating bike lane slab structure according to any one of claims 1 to 3, characterized in that, Includes the following steps: Establish a finite element model of the building structure for which vibration reduction design is required, and simulate vehicle load based on a seven-degree-of-freedom spatial vehicle model to construct the motion equations of the vehicle model; Considering the surface irregularities of the driveway pavement in the building structure, a displacement power spectrum function for the roadway pavement irregularities is constructed. Predict the dynamic response of sensitive areas within the building structure under vehicle load before vibration reduction; Based on the dynamic response of the sensitive areas within the building structure before vibration reduction, the thickness of the XPS extruded polystyrene board is designed, and the concrete surface layer is designed separately. The dynamic response of the sensitive areas within the building structure under vehicle load after vibration reduction is predicted, and the vibration reduction effect of the floating driveway slab structure is verified. The floating roadway slab structure is constructed and arranged.

5. The parameter design method for the floating roadway slab structure according to claim 4, characterized in that, A finite element model of the building structure is established based on ANSYS, and a seven-degree-of-freedom spatial vehicle model based on multi-rigid-body dynamics is used to simulate the vehicle load, and a displacement curve of the vehicle model is constructed by the following formula to simulate the running state of the vehicle and obtain the influence of the vehicle on the building structure during running. ； wherein: is the vertical displacement of the vehicle body; is the roll displacement of the vehicle body; is the pitch displacement of the vehicle body; is the vertical displacement of the wheel, wherein the subscript i = 1, 2, 3, 4 represents the left front, right front, left rear, and right rear wheels, respectively; The displacement relationship between the vehicle body and the wheels is obtained through the following formula, which maps the vehicle body motion onto the wheels: ； In the formula: The vertical displacement of the wheel is represented by the subscripts i = 1, 2, 3, 4, which represent the four wheels: left front, right front, left rear, and right rear, respectively. This represents the vertical displacement of the vehicle body; a This is the distance from the axle to the vehicle's center of gravity. This refers to the vehicle body pitch displacement; b The track width is the distance between the front and rear axles; This refers to the vehicle body roll displacement; Based on d'Alembert's principle, the vehicle's equilibrium equations are established using the following formula to establish the dynamic relationship between forces and vehicle motion: ； ； ； ； In the formula: m b For vehicle body weight; C si and k si These represent the damping and stiffness of each suspension spring, where i = 1, 2, 3, 4; I p For pitch inertia; I r This is the moment of inertia of the roll. a This is the distance from the axle to the vehicle's center of gravity. b The track width is the distance between the front and rear axles; m w For the mass of the wheel and tire; k t For wheel and tire stiffness; The equation of motion for the vehicle is obtained from the above formula, and its matrix form is as follows: ； In the formula: , , These are the vehicle's mass, damping, and stiffness matrices, respectively. , , These are the vehicle's acceleration, velocity, and displacement vectors, respectively. This represents the load vector of the vehicle system.

6. The parameter design method for the floating roadway slab structure according to claim 4, characterized in that, The displacement power spectrum function of the road surface irregularities is constructed using the following formula. : ； In the formula: Spatial frequency; This is the surface roughness coefficient; As a reference spatial frequency, take ; w f For the frequency exponent, take w f =2.

7. The parameter design method for the floating roadway slab structure according to claim 4, characterized in that, Using a separation iteration method and considering the surface irregularities of the roadway in the building structure, numerical calculations are performed on the established vehicle model and the finite element model of the building structure to predict the dynamic response of sensitive areas within the building structure under vehicle load before vibration reduction.

8. The parameter design method for the floating roadway slab structure according to claim 4, characterized in that, The structural layer base plate, the mortar leveling layer, and the concrete surface layer are all set as elastic rectangular thin plates. Based on the dynamic response of the sensitive area within the building structure before vibration reduction, the thickness parameters of the XPS extruded board are designed and simulated using the spring element Combin14 in ANSYS. The structural layer base plate, the mortar leveling layer, and the concrete surface layer are simplified to a surface layer, and the XPS extruded board is simplified to a spring, which together form a single-degree-of-freedom system. The total stiffness and damping coefficient of the spring are designed based on the mass of the concrete surface layer and the simulated vehicle load. The separation iteration method is used to perform numerical calculations on the established vehicle model and the finite element model of the building structure after the floating driveway slab structure is arranged, to predict the dynamic response of the sensitive area in the building structure when the vehicle load is running after vibration reduction, and to verify the vibration reduction effect of the floating driveway slab structure.

9. A construction method based on the floating roadway slab structure according to any one of claims 1 to 3, characterized in that, Includes the following steps: Pre-fabricate the concrete surface layer, and then bond the XPS extruded polystyrene board to the concrete surface layer; The bonded concrete surface layer and the XPS extruded polystyrene board assembly are transported to the construction site, and the planned paving area is inspected. The concrete surface layer and the XPS extruded polystyrene board assembly are bonded to the mortar leveling layer.

10. The construction method of the floating roadway slab structure according to claim 9, characterized in that, The XPS extruded board is bonded to the concrete surface using a two-component polyurethane adhesive. Before laying, check the quality of the structural layer base plate in the predetermined laying area, and lay the mortar leveling layer on the structural layer base plate. The precast concrete surface layer and the XPS extruded board assembly are bonded to the mortar leveling layer using a two-component polyurethane adhesive. During construction, a flexible isolation pad is installed between the floating roadway structure and the road for isolation. The flexible isolation pad includes a polyurethane pad with a thickness of 19-21 mm. The two-component polyurethane adhesive includes component A and component B, and the mixing mass ratio of component A to component B is 2:1 to 4:1.

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