Periodic row pile vibration reduction and isolation structure and system and installation method
By introducing a combined structure of connecting walls and using PHC pipe piles and rubber cores in periodic pile rows, the problems of poor vibration isolation and high cost in the prior art are solved, and more efficient vibration isolation and lower vibration isolation are achieved construction cost.
Patent Information
- Application Number
- CN202411567598.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-02-18
AI Technical Summary
The existing periodic pile discharges have problems such as poor vibration isolation, high construction difficulty and high cost in actual projects, especially in limited space and low-frequency vibration scenarios.
The combined structure of multiple rows of piles and connecting walls is adopted. Through the combination of pipe piles and rubber cores, rubber walls are added to improve vibration isolation, and the use of PHC pipe piles and rubber materials is used to reduce production costs.
It improves the integrity and vibration isolation effect of the piles, reduces construction difficulty and cost, and enhances the stability and applicability of the structure.
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of tunnel vibration reduction and isolation, and in particular to a periodic pile row vibration reduction and isolation structure, system and installation method. Background Art
[0002] Vibration isolation piles are a low-cost and easy-to-construct vibration isolation measure, and periodic piles are one of the vibration isolation piles. Domestic and foreign scholars have confirmed the vibration isolation effect of periodic piles through theoretical analysis and numerical calculations. Although the theory of periodic piles is relatively mature, it is not widely used in actual projects due to limited site space, comprehensive construction management, and vibration isolation effect at low frequencies. Therefore, periodic piles still have a lot of room for development in domestic vibration isolation pile measures.
[0003] Since the 21st century, with the rapid development of urban rail transit construction, the subway has become one of the most convenient ways for people to travel daily. However, with the improvement of the subway network, the subway will inevitably pass through some densely populated areas, which will bring serious vibration pollution to the normal lives of nearby residents, affect people's quality of life, and even threaten the safety of nearby buildings. At present, there are three main ways to reduce the impact of rail transit vibration on people: reduce the vibration waves excited by the vibration source, take vibration reduction and isolation measures on the propagation path, and take protective measures for the target buildings. Among the vibration reduction and isolation measures on the propagation path, vibration reduction and isolation piles have gradually attracted the attention of domestic and foreign scholars due to their advantages such as convenient construction and low cost. In actual engineering, the periodic pile structure has good vibration isolation effect and high feasibility.
[0004] Periodic pile rows are a kind of periodic structure. When elastic waves propagate in the periodic structure, they will show characteristics similar to "filtering", that is, waves of certain frequencies cannot propagate in the periodic structure or are greatly attenuated. This phenomenon is called the bandgap characteristic of the periodic structure. The bandgap characteristic of the periodic structure is one of its important characteristic features. Domestic and foreign scholars have conducted a lot of research on the vibration isolation of periodic pile rows. According to the types of materials that make up the periodic pile rows, they can be divided into one-component pile rows (consisting of only one material), two-component pile rows (consisting of two materials), three-component pile rows (consisting of three materials), and four-component pile rows (consisting of four materials). According to the vibration reduction and isolation mechanism of periodic pile rows, they can be divided into periodic pile rows based on Bragg scattering mechanism and periodic pile rows based on local resonance mechanism. The band gap of the Bragg scattering type periodic structure is due to the reflection, diffraction and other phenomena that occur when the elastic wave propagates in the periodically changing material. When the wavelength of the elastic wave is comparable to the size of the scatterer material of the periodic structure, the modulation of the elastic wave by the periodic structure will reach the maximum, making it impossible for the elastic wave within a specific frequency range to pass through the periodic structure. The formation of the band gap of the local resonance type periodic structure is due to the fact that the elastic wave within a specific frequency range will excite the resonant mode of the scatterer, and the traveling wave mode of the matrix interacts with the resonant mode of the scatterer, resulting in the continuous attenuation of the vibration along the propagation direction. This frequency range is also called the phononic crystal band gap. The periodic structure based on the local resonance mechanism is mainly a three-component structure composed of a matrix, a hard core, and a soft layer. The research results show that the periodic pile row based on the local resonance mechanism can achieve small size control of large wavelength, and has a good development prospect in the field of low-frequency vibration reduction and isolation.
[0005] The existing periodic pile arrangement has certain shortcomings in actual engineering:
[0006] (1) For periodic pile rows based on the Bragg scattering mechanism, the characteristic is that the wavelength corresponding to the vibration isolation frequency is approximately twice the lattice constant, which requires that the pile rows have a larger lattice constant to have a better vibration reduction effect. However, in a limited space, it is difficult for existing pile rows to isolate long-wave vibrations, and thus it is difficult to meet the low-frequency vibration isolation requirements with larger wavelengths in civil engineering.
[0007] (2) For periodic pile rows based on the local resonance mechanism, the band gap frequency of vibration reduction is mostly adjusted by adjusting the pile diameter or changing the type of filler. However, in the limited actual engineering vibration isolation space, the adjustability of the pile diameter is limited, and repeated adjustment of the pile diameter is not conducive to mass production and management. In terms of filler type, it is difficult to produce a series of materials with different stiffness due to the limitations of material manufacturing process, and the accuracy is difficult to control. Its development, production and management costs are also high.
[0008] (3) The soil material in the vibrating site generally has characteristics such as fluid plasticity or elastic plasticity. Under the influence of rain erosion or external vibration, it is difficult for the piles with a soft layer on the outside to remain stable in the soil. Summary of the invention
[0009] The technical problem to be solved by the present invention is to provide a periodic pile row vibration reduction and isolation structure, system and installation method in view of the deficiencies in the prior art.
[0010] The technical solution of the present invention to solve the above technical problems is as follows: a periodic pile row vibration reduction and isolation structure, comprising: a plurality of pile rows and a plurality of connecting walls, the plurality of connecting walls correspondingly connecting two adjacent rows of piles one by one, the pile row comprising pipe piles and pile cores, the pipe piles being sleeved on the outside of the pile cores.
[0011] The beneficial effect of the technical solution of the present invention is: adding a connecting wall between two adjacent rows of piles to further improve the vibration isolation effect. The existing rows of piles are isolated from each other and have limited vibration isolation performance. The periodic rows of piles based on the connecting wall proposed in the present invention can improve the integrity of the rows of piles and provide a new idea for the development of periodic rows of piles. The traditional periodic rows of piles are made of solid concrete as a whole. In long-term use, their vibration isolation effect will inevitably decrease gradually. The pile core buried in the center of the pipe pile proposed in the present invention gives full play to the ideal vibration reduction performance of the pile core.
[0012] Furthermore, the row of piles is a cylindrical structure, the pipe piles are cylindrical tubes, the pile core is a cylindrical structure, and the connecting wall is a rectangular structure; the two ends of the connecting wall are connected to two adjacent rows of piles one by one through chloroprene rubber adhesive.
[0013] The beneficial effects of adopting the above further technical solution are: the circular cross section is convenient for construction, and when driving into the soil layer, the resistance of the circular piles is smaller than that of the piles of other cross-sectional shapes, and it is not easy to wear. Rubber walls are added from top to bottom between two adjacent rows of piles to further improve the vibration isolation effect.
[0014] Furthermore, the pipe pile is a PHC pipe pile, the pile core is a rubber core, and the connecting wall is a rubber wall.
[0015] The beneficial effects of adopting the above further technical scheme are: the single PHC pipe pile has high bearing capacity, wide application range, reliable pile sinking quality, and low engineering cost. (1) Rubber is an ideal vibration reduction material and has a damping effect on vibration; (2) Rubber, like water, is almost incompressible and only undergoes elastic deformation after being compressed, but its volume remains unchanged; (3) Rubber has great linear flexibility and can be stretched almost to the point of breaking without losing its elasticity, and can withstand alternating stress without easily showing fatigue. Rubber walls are added from top to bottom between two adjacent rows of piles to further enhance the vibration isolation effect. Traditional periodic pile rows are made of solid concrete as a whole. In long-term use, their vibration isolation effect will inevitably gradually decrease. The rubber material buried in the center of the pipe pile proposed in the present invention gives full play to the ideal vibration reduction performance of rubber. The existing pile rows are isolated from each other and have limited vibration isolation performance. The periodic pile rows based on rubber wall connection proposed in the present invention can improve the integrity of the pile rows and provide a new idea for the development of periodic pile rows. The existing local resonance type periodic pile structure is composed of soil, soft layer and hard core from outside to inside, while the periodic structure proposed by the present invention is composed of soil, hard layer (PHC pipe pile) and soft core (rubber core) from outside to inside. The three-component structure thus formed can greatly improve the stability of the periodic pile. PHC pipe pile and rubber material are used, which has a lower production cost.
[0016] Furthermore, the plurality of rows of piles are arranged in a square lattice, or the plurality of rows of piles are arranged in a hexagonal lattice.
[0017] The beneficial effect of adopting the above further technical solution is that multiple rows of piles are periodically combined into different shapes, which makes it easy to design the combined shapes of multiple rows of piles according to actual needs, and makes it easy for multiple rows of piles to adapt to different application scenarios, thereby improving applicability.
[0018] Furthermore, the distance between two adjacent rows of piles is less than or equal to twice the diameter of the row of piles, the connecting wall is equal to the length of the row of piles, and the radius of the pile core is less than or equal to three times the thickness of the pipe pile.
[0019] The beneficial effects of adopting the above further technical solution are: the distance between two adjacent rows of piles does not exceed twice their diameters to prevent the vibration isolation effect from being reduced due to the large distance between them. The radius of the rubber core does not exceed three times the thickness of the PHC prefabricated pipe pile to avoid the damage of the periodic pile structure caused by the small thickness of the PHC prefabricated pipe pile during long-term use.
[0020] In addition, the present invention also provides a periodic pile row vibration reduction and isolation system, including any one of the periodic pile row vibration reduction and isolation structures described above, and also including: a vibration source and a target vibration isolation object, and multiple pile rows are located between the vibration source and the target vibration isolation object.
[0021] The beneficial effect of the technical solution of the present invention is: adding a connecting wall between two adjacent rows of piles to further improve the vibration isolation effect. The existing rows of piles are isolated from each other and have limited vibration isolation performance. The periodic rows of piles based on the connecting wall proposed in the present invention can improve the integrity of the rows of piles and provide a new idea for the development of periodic rows of piles. The traditional periodic rows of piles are made of solid concrete as a whole. In long-term use, their vibration isolation effect will inevitably decrease gradually. The pile core buried in the center of the pipe pile proposed in the present invention gives full play to the ideal vibration reduction performance of the pile core.
[0022] Furthermore, the vibration source is a tunnel, the target vibration isolation object is a target vibration isolation building, the burying depth of the pile row is greater than the burying depth of the tunnel; the lengths of the multiple pile rows are the same, or the lengths of the multiple pile rows along the direction from the vibration source to the target vibration isolation object decrease successively.
[0023] The beneficial effects of adopting the above further technical solution are: the buried depth of the pile row is greater than the buried depth of the tunnel, thereby improving the vibration isolation effect. As the distance between the pile row and the vibration source increases, the length of the pile row is gradually reduced, thereby reducing the construction cost.
[0024] In addition, the present invention also provides an installation method for a periodic pile row vibration isolation system. Based on a periodic pile row vibration isolation system described in any one of the above items, the installation method for the periodic pile row vibration isolation system includes: S1, drilling multiple first boreholes for installing pile rows at preset pile row positions; S2, drilling second boreholes for installing connecting walls on the center straight line of two adjacent first boreholes; S3, pressing multiple pipe piles into the multiple first boreholes one by one, and burying pile cores in multiple pipe columns one by one; S4, connecting multiple connecting walls to two adjacent pile rows one by one.
[0025] The beneficial effect of the technical solution of the present invention is: adding a connecting wall between two adjacent rows of piles to further improve the vibration isolation effect. The existing rows of piles are isolated from each other and have limited vibration isolation performance. The periodic rows of piles based on the connecting wall proposed in the present invention can improve the integrity of the rows of piles and provide a new idea for the development of periodic rows of piles. The traditional periodic rows of piles are made of solid concrete as a whole. In long-term use, their vibration isolation effect will inevitably decrease gradually. The pile core buried in the center of the pipe pile proposed in the present invention gives full play to the ideal vibration reduction performance of the pile core.
[0026] Further, step S1 includes: S11, setting a preset pile row position between the vibration source and the target vibration isolation object; S12, drilling multiple first boreholes for installing pile rows at the preset pile row position by spiral drilling; wherein the depth of the first borehole is greater than the burial depth of the vibration source; in step S2, the depth of the second borehole is the same as the depth of the first borehole; in step S3, using a static pressure method to press multiple PHC pipe piles into multiple first boreholes one by one, and burying rubber cores in multiple pipe columns one by one; wherein the burial depth of the PHC pipe piles is greater than the burial depth of the vibration source; step S4 includes: S41, applying chloroprene rubber adhesive at both ends of multiple rubber walls; S42, connecting multiple rubber walls one by one to two adjacent pile rows.
[0027] The beneficial effects of adopting the above further technical solution are: the installation method is simple and reliable, easy to construct, and reduces the construction difficulty. Continue drilling on the center straight line adjacent to the row of piles to form an axial crack, and the drilling depth is the same as the drilling depth of the row of piles, leaving enough gap for the rubber wall.
[0028] Furthermore, before step S1, the process includes: determining the spacing between piles and the size of the rubber wall, and prefabricating the PHC piles and the rubber wall.
[0029] The beneficial effects of adopting the above further technical solution are: designing relevant dimensions in advance and prefabricating PHC pipe piles and rubber walls, which are convenient for direct use on site, shortening working time and improving working efficiency.
[0030] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 This is one of the structural schematic diagrams of the periodic pile row vibration reduction and isolation structure provided in an embodiment of the present invention.
[0032] Figure 2 The second structural schematic diagram of the periodic pile row vibration reduction and isolation structure provided in an embodiment of the present invention.
[0033] Figure 3 A schematic diagram of the structure of a pile row provided in an embodiment of the present invention.
[0034] Figure 4 A schematic diagram of a periodic pile square lattice arrangement provided in an embodiment of the present invention.
[0035] Figure 5 A schematic diagram of a periodic pile hexagonal lattice arrangement provided in an embodiment of the present invention.
[0036] Figure 6 This is one of the structural schematic diagrams of the periodic pile row vibration reduction and isolation system provided in an embodiment of the present invention.
[0037] Figure 7 The second structural schematic diagram of the periodic pile row vibration reduction and isolation system provided in an embodiment of the present invention.
[0038] Figure 8 One of the schematic flow charts of the installation method of the periodic pile row vibration reduction and isolation system provided in the embodiment of the present invention.
[0039] Fig. 9 The second schematic flowchart of the installation method of the periodic pile row vibration reduction and isolation system provided in the embodiment of the present invention.
[0040] Explanation of the accompanying figures: 1. row of piles; 11. pipe piles; 12. pile core; 2. connecting wall; 3. vibration source; 4. target vibration isolation object. DETAILED DESCRIPTION
[0041] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention but not to limit the scope of the present invention.
[0042] like Figures 1 to 5 As shown, an embodiment of the present invention provides a periodic pile row vibration reduction and isolation structure, including: a plurality of pile rows 1 and a plurality of connecting walls 2, wherein the plurality of connecting walls 2 connect two adjacent pile rows 1 in a one-to-one correspondence, and the pile row 1 includes pipe piles 11 and pile cores 12, and the pipe piles 11 are sleeved on the outside of the pile cores 12.
[0043] The beneficial effect of the technical solution of the present invention is: adding a connecting wall between two adjacent rows of piles to further improve the vibration isolation effect. The existing rows of piles are isolated from each other and have limited vibration isolation performance. The periodic rows of piles based on the connecting wall proposed in the present invention can improve the integrity of the rows of piles and provide a new idea for the development of periodic rows of piles. The traditional periodic rows of piles are made of solid concrete as a whole. In long-term use, their vibration isolation effect will inevitably decrease gradually. The pile core buried in the center of the pipe pile proposed in the present invention gives full play to the ideal vibration reduction performance of the pile core.
[0044] Figure 1 and Figure 2 Where a is the thickness of the connecting wall 2. Figure 3 R in is the radius of the pile 11, Figure 3 The r in the figure is the radius of the pile core 12. Figure 4 and Figure 5 L in the figure is the distance between two adjacent rows of piles 1.
[0045] A periodic pile row vibration reduction and isolation structure provided in an embodiment of the present invention can be a local resonance type periodic pile row based on rubber wall connection that can maintain its own stability. It aims to achieve convenient construction and good low-frequency vibration reduction and isolation performance at a reasonable cost, and provide new ideas for the development and application of periodic pile rows.
[0046] like Figures 1 to 5 As shown, further, the row of piles 1 is a cylindrical structure, the pipe piles 11 are cylindrical tubes, the pile cores 12 are cylindrical structures, and the connecting wall 2 is a rectangular structure; the two ends of the connecting wall 2 are connected to two adjacent rows of piles 1 one by one through chloroprene rubber adhesive.
[0047] The beneficial effects of adopting the above further technical solution are: the circular cross section is convenient for construction, and when driving into the soil layer, the resistance of the circular piles is smaller than that of the piles of other cross-sectional shapes, and it is not easy to wear. Rubber walls are added from top to bottom between two adjacent rows of piles to further improve the vibration isolation effect.
[0048] like Figures 1 to 5 As shown, further, the pipe pile 11 is a PHC pipe pile, the pile core 12 is a rubber core, and the connecting wall 2 is a rubber wall.
[0049] The beneficial effects of adopting the above further technical scheme are: the single PHC pipe pile has high bearing capacity, wide application range, reliable pile sinking quality, and low engineering cost. (1) Rubber is an ideal vibration reduction material and has a damping effect on vibration; (2) Rubber, like water, is almost incompressible and only undergoes elastic deformation after being compressed, but its volume remains unchanged; (3) Rubber has great linear flexibility and can be stretched almost to the point of breaking without losing its elasticity, and can withstand alternating stress without easily showing fatigue. Rubber walls are added from top to bottom between two adjacent rows of piles to further enhance the vibration isolation effect. Traditional periodic pile rows are made of solid concrete as a whole. In long-term use, their vibration isolation effect will inevitably gradually decrease. The rubber material buried in the center of the pipe pile proposed in the present invention gives full play to the ideal vibration reduction performance of rubber. The existing pile rows are isolated from each other and have limited vibration isolation performance. The periodic pile rows based on rubber wall connection proposed in the present invention can improve the integrity of the pile rows and provide a new idea for the development of periodic pile rows. The existing local resonance type periodic pile structure is composed of soil, soft layer and hard core from outside to inside, while the periodic structure proposed by the present invention is composed of soil, hard layer (PHC pipe pile) and soft core (rubber core) from outside to inside. The three-component structure thus formed can greatly improve the stability of the periodic pile. PHC pipe pile and rubber material are used, which has a lower production cost.
[0050] like Figures 1 to 5 As shown, further, the plurality of rows of piles 1 are arranged in a square lattice, or the plurality of rows of piles 1 are arranged in a hexagonal lattice.
[0051] The beneficial effect of adopting the above further technical solution is that multiple rows of piles are periodically combined into different shapes, which makes it easy to design the combined shapes of multiple rows of piles according to actual needs, and makes it easy for multiple rows of piles to adapt to different application scenarios, thereby improving applicability.
[0052] like Figures 1 to 5 As shown, further, the distance between two adjacent rows of piles 1 is less than or equal to twice the diameter of the row of piles 1 , the connecting wall 2 is equal to the same length as the row of piles 1 , and the radius of the pile core 12 is less than or equal to three times the thickness of the pipe pile 11 .
[0053] The beneficial effects of adopting the above further technical solution are: the distance between two adjacent rows of piles does not exceed twice their diameters to prevent the vibration isolation effect from being reduced due to the large distance between them. The radius of the rubber core does not exceed three times the thickness of the PHC prefabricated pipe pile to avoid the damage of the periodic pile structure caused by the small thickness of the PHC prefabricated pipe pile during long-term use.
[0054] Basic unit of pile row
[0055] First, the basic unit of the pile row (pile row) of the present invention is described. Figure 3 Each pile row unit (single pile row) used in the present invention has a circular cross section. This is because the circular cross section is convenient for construction. When driven into the soil layer, the resistance of the circular pile row is smaller than that of the pile rows with other cross-sectional shapes, and it is not easy to wear.
[0056] like Figure 3 As shown in the figure, the outer layer of the pile (pile) is made of prestressed high-strength concrete pipe pile (PHC pipe pile). PHC pipe pile is a hollow cylindrical concrete prefabricated component made by prestressed centrifugal forming process and cured by steam at 10 atmospheres (about 1.0Mpa) and 180℃. The standard section length of PHC pipe pile is 10m, the diameter ranges from 300mm to 800mm, and the concrete strength grade is ≥C80.
[0057] The advantages of PHC pipe piles are as follows: (1) High single pile bearing capacity. Due to the high strength of the concrete of the PHC pipe pile body, it can be driven into dense sand layers and strongly weathered rock layers. In addition, due to the extrusion effect, the pile end bearing capacity can be increased by 70% to 80% compared with the original soil, and the pile side friction resistance can be increased by 20% to 40%; (2) Wide range of applications. PHC pipe piles bear the upper load by side resistance and end resistance. A variety of soil types such as strongly weathered rock layers, fully weathered rock layers, hard clay layers or dense sand layers (or pebble layers) can be selected as the bearing layer, and they have strong adaptability to geological conditions with large fluctuations in the bearing layer. Therefore, they are suitable for a wide range of regions and building types; (3) Reliable pile sinking quality. PHC pipe piles are factory-based, professional, and standardized production, with reliable pile body quality; convenient transportation and hoisting, and quick pile connection; high degree of mechanized construction, simple operation, and easy control; easy to guarantee bearing capacity, bending resistance, and pull-out resistance; (4) Low project cost.
[0058] The pile core of the pile row unit (pile row) of the present invention is intended to be made of rubber material for the following main reasons: (1) Rubber is an ideal vibration-damping material and has a damping effect on vibration; (2) Rubber, like water, is almost incompressible and only undergoes elastic deformation when compressed, but its volume remains unchanged; (3) Rubber has great linear flexibility and can be stretched almost to rupture without losing its elasticity, and can withstand alternating stress without easily becoming fatigued.
[0059] Pile arrangement
[0060] The present invention intends to adopt two more commonly used arrangements, namely, a square lattice arrangement and a hexagonal lattice arrangement, respectively as follows Figure 4 and Figure 5 As shown. Users can choose and design different arrangements according to actual needs.
[0061] Pile connection method
[0062] The present invention intends to add a rubber wall component (connecting wall) from top to bottom between two adjacent rows of piles to further enhance the vibration isolation effect. The schematic diagram after adding the rubber wall is as follows: Figure 1 and Figure 2 The longitudinal section of the pile row is shown in Figure 6 shown.
[0063] like Figure 6 and Figure 7 As shown, in addition, the present invention also provides a periodic pile row vibration reduction and isolation system, including a periodic pile row vibration reduction and isolation structure as described in any one of the above, and also including: a vibration source 3 and a target vibration isolation object 4, and a plurality of pile rows 1 are located between the vibration source 3 and the target vibration isolation object 4.
[0064] The beneficial effect of the technical solution of the present invention is: adding a connecting wall between two adjacent rows of piles to further improve the vibration isolation effect. The existing rows of piles are isolated from each other and have limited vibration isolation performance. The periodic rows of piles based on the connecting wall proposed in the present invention can improve the integrity of the rows of piles and provide a new idea for the development of periodic rows of piles. The traditional periodic rows of piles are made of solid concrete as a whole. In long-term use, their vibration isolation effect will inevitably decrease gradually. The pile core buried in the center of the pipe pile proposed in the present invention gives full play to the ideal vibration reduction performance of the pile core.
[0065] like Figure 6 and Figure 7 As shown, further, the vibration source 3 is a tunnel, the target vibration isolator 4 is a target vibration isolation building, the burial depth of the pile row 1 is greater than the burial depth of the tunnel; the lengths of the plurality of pile rows 1 are the same, or the lengths of the plurality of pile rows 1 along the direction from the vibration source 3 to the target vibration isolator 4 decrease successively.
[0066] The beneficial effects of adopting the above further technical solution are: the buried depth of the pile row is greater than the buried depth of the tunnel, thereby improving the vibration isolation effect. As the distance between the pile row and the vibration source increases, the length of the pile row is gradually reduced, thereby reducing the construction cost.
[0067] Figure 6 The H in the figure is the length of the pile row. Figure 7 H1 is the length of the row of piles adjacent to the target vibration isolator 4 , H2 is the length of the row of piles located in the middle, and H3 is the length of the row of piles adjacent to the vibration source 3 .
[0068] (1) Embedding rubber material in hollow PHC piles. The conventional periodic piles are made of solid concrete. In long-term use, their vibration isolation effect will inevitably decline gradually. However, the rubber material embedded in the center of the pile proposed in the present invention fully exerts the ideal vibration reduction performance of rubber.
[0069] (2) Application of rubber wall.
[0070] The invention lies in the use of rubber walls to connect the rows of piles. In the existing rows of piles, the piles are isolated from each other and have limited vibration isolation performance. However, the periodic rows of piles (periodic rows of piles for vibration reduction and isolation) based on rubber wall connection proposed in the present invention can improve the integrity of the rows of piles and provide a new idea for the development of periodic rows of piles.
[0071] like Figure 8As shown, in addition, the present invention also provides an installation method for a periodic pile row vibration reduction and isolation system. Based on a periodic pile row vibration reduction and isolation system described in any one of the above items, the installation method for the periodic pile row vibration reduction and isolation system includes: S1, drilling a plurality of first boreholes for installing pile rows at preset pile row positions; S2, drilling a second borehole for installing a connecting wall on the center straight line of two adjacent first boreholes; S3, pressing a plurality of pipe piles into the plurality of first boreholes one by one, and burying pile cores in a plurality of pipe columns one by one; S4, connecting a plurality of connecting walls one by one to two adjacent pile rows.
[0072] The beneficial effect of the technical solution of the present invention is: adding a connecting wall between two adjacent rows of piles to further improve the vibration isolation effect. The existing rows of piles are isolated from each other and have limited vibration isolation performance. The periodic rows of piles based on the connecting wall proposed in the present invention can improve the integrity of the rows of piles and provide a new idea for the development of periodic rows of piles. The traditional periodic rows of piles are made of solid concrete as a whole. In long-term use, their vibration isolation effect will inevitably decrease gradually. The pile core buried in the center of the pipe pile proposed in the present invention gives full play to the ideal vibration reduction performance of the pile core.
[0073] like Fig. 9 As shown, 1. Prefabricate PHC pipe piles and determine the size of the rubber wall; 2. Determine the spacing between piles; 3. Drill long spiral holes; 4. Use static pressure method for construction; 5. Bury the rubber core; 6. Connect the rubber wall.
[0074] Further, step S1 includes: S11, setting a preset pile row position between the vibration source and the target vibration isolation object; S12, drilling multiple first boreholes for installing pile rows at the preset pile row position by spiral drilling; wherein the depth of the first borehole is greater than the burial depth of the vibration source; in step S2, the depth of the second borehole is the same as the depth of the first borehole; in step S3, using a static pressure method to press multiple PHC pipe piles into multiple first boreholes one by one, and burying rubber cores in multiple pipe columns one by one; wherein the burial depth of the PHC pipe piles is greater than the burial depth of the vibration source; step S4 includes: S41, applying chloroprene rubber adhesive at both ends of multiple rubber walls; S42, connecting multiple rubber walls one by one to two adjacent pile rows.
[0075] The beneficial effects of adopting the above further technical solution are: the installation method is simple and reliable, easy to construct, and reduces the construction difficulty. Continue drilling on the center straight line adjacent to the row of piles to form an axial crack, and the drilling depth is the same as the drilling depth of the row of piles, leaving enough gap for the rubber wall.
[0076] Among them, the length of the pile row can be gradually reduced as the distance between the pile row and the vibration source increases, so as to reduce the construction cost. Figure 7 shown.
[0077] Furthermore, before step S1, the process includes: determining the spacing between piles and the size of the rubber wall, and prefabricating the PHC piles and the rubber wall.
[0078] The beneficial effects of adopting the above further technical solution are: designing relevant dimensions in advance and prefabricating PHC pipe piles and rubber walls, which are convenient for direct use on site, shortening working time and improving working efficiency.
[0079] The following is a detailed introduction to a construction example:
[0080] (1) First, spiral drilling is performed at the preset position of the pile row. It should be noted that the drilling depth and the buried depth of the pile row should be greater than the buried depth of the subway tunnel (vibration source). At the same time, it should be noted that the distance between two adjacent rows of piles should not exceed twice their diameters to prevent the vibration isolation effect from being reduced due to excessive spacing. Then, continue drilling on the center straight line adjacent to the pile row to form an axial crack. The drilling depth (depth of the axial crack) is the same as the drilling depth of the pile row. The location of the drilling hole is as follows: Figure 1 and Figure 2 The rubber wall position shown leaves enough clearance for the rubber wall.
[0081] (2) Then, the PHC piles are pressed into the soil using the static pressure method, and rubber material is buried in the center of the piles. It should be noted that the radius of the center rubber (rubber core) should not exceed three times the thickness of the PHC prefabricated piles to avoid the damage of the periodic pile structure caused by the small thickness of the PHC prefabricated piles during long-term use.
[0082] (3) Finally, the thickness of the rubber wall is determined according to the actual project needs, and then chloroprene rubber adhesive is applied to both ends of the left and right sides of each rubber wall to connect adjacent rows of piles to form a rubber wall to further improve its vibration isolation effect.
[0083] The beneficial effects of the present invention are as follows: (1) the existing local resonance type periodic pile row structure is composed of soil, soft layer and hard core from the outside to the inside, while the periodic structure proposed by the present invention is composed of soil, hard layer (PHC pipe pile) and soft core (rubber core) from the outside to the inside. The three-component structure thus formed can greatly improve the stability of the periodic pile row.
[0084] (2) Based on the existing periodic pile row types, the present invention makes good use of rubber, an ideal vibration reduction and isolation material, and uses rubber walls to connect adjacent pile rows. On the basis of forming a multi-resonance structure, the integrity is further improved, thereby further improving the vibration reduction and isolation effect of the periodic pile row.
[0085] (3) The present invention adopts PHC pipe piles and rubber materials, which has a lower production cost.
[0086] (4) The implementation method of the present invention is relatively simple, highly operable, and has good application prospects.
[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A periodic pile row vibration reduction and isolation structure, characterized in that: include: A plurality of rows of piles and a plurality of connecting walls, wherein the plurality of connecting walls connect two adjacent rows of piles in a one-to-one correspondence, and the row of piles comprises pipe piles and pile cores, wherein the pipe piles are sleeved on the outside of the pile cores.
2. A periodic pile row vibration reduction and isolation structure according to claim 1, characterized in that: The row of piles is a cylindrical structure, the pipe piles are cylindrical tubes, the pile core is a cylindrical structure, and the connecting wall is a rectangular structure; the two ends of the connecting wall are connected to two adjacent rows of piles in a one-to-one correspondence through a chloroprene rubber adhesive.
3. The periodic pile row vibration reduction and isolation structure according to claim 1 is characterized in that: The pipe pile is a PHC pipe pile, the pile core is a rubber core, and the connecting wall is a rubber wall.
4. The periodic pile row vibration reduction and isolation structure according to claim 1 is characterized in that: The plurality of rows of piles are arranged in a square lattice, or the plurality of rows of piles are arranged in a hexagonal lattice.
5. The periodic pile row vibration reduction and isolation structure according to claim 1 is characterized in that: The distance between two adjacent rows of piles is less than or equal to twice the diameter of the row of piles, the connecting wall is equal to the length of the row of piles, and the radius of the pile core is less than or equal to three times the thickness of the pipe pile.
6. A periodic pile vibration reduction and isolation system, characterized in that: A periodic pile row vibration reduction and isolation structure comprising any one of claims 1 to 5, further comprising: a vibration source and a target vibration isolation object, wherein a plurality of pile rows are located between the vibration source and the target vibration isolation object.
7. The periodic pile row vibration reduction and isolation system according to claim 6 is characterized in that: The vibration source is a tunnel, the target vibration isolator is a target vibration isolation building, the burying depth of the pile row is greater than the burying depth of the tunnel; the lengths of the multiple pile rows are the same, or the lengths of the multiple pile rows along the direction from the vibration source to the target vibration isolator decrease in sequence.
8. A method for installing a periodic pile row vibration reduction and isolation system, characterized in that: Based on a periodic pile row vibration reduction and isolation system according to any one of claims 6 to 7 above, the installation method of the periodic pile row vibration reduction and isolation system includes: S1, drilling a plurality of first boreholes for installing the row of piles at a preset row of piles position; S2, drilling a second borehole for installing a connecting wall on a center straight line between two adjacent first boreholes; S3, pressing the plurality of pipe piles into the plurality of first boreholes one by one, and burying the pile cores in the plurality of pipe columns one by one; S4. Connect the multiple connecting walls to two adjacent rows of piles one by one.
9. The installation method of a periodic pile row vibration reduction and isolation system according to claim 8 is characterized in that: Step S1 includes: S11, setting a preset pile position between the vibration source and the target vibration isolation object; S12, drilling a plurality of first boreholes for installing the row of piles at the preset row of piles position by spiral drilling; wherein the depth of the first boreholes is greater than the embedding depth of the vibration source; In step S2, the depth of the second borehole is the same as the depth of the first borehole; In step S3, a plurality of PHC pipe piles are pressed into a plurality of first boreholes one by one by using a static pressure method, and rubber cores are buried one by one in a plurality of pipe columns; wherein the burying depth of the PHC pipe piles is greater than the burying depth of the vibration source; Step S4 includes: S41. Apply neoprene adhesive to both ends of the multiple rubber walls; S42, connecting the plurality of rubber walls to two adjacent rows of piles one by one.
10. The installation method of a periodic pile row vibration reduction and isolation system according to claim 8, characterized in that: The steps before step S1 include: determining the spacing between piles and the size of the rubber wall, and prefabricating the PHC piles and the rubber wall.