Vibration reduction type shield tunnel segment positioning rod and vibration reduction method thereof

Abstract

The invention discloses a vibration reduction type shield tunnel segment positioning rod and a vibration reduction method thereof.The positioning rod comprises a vibration reduction core rod which is formed by two semi-cylindrical vibration reduction blocks in a butt joint mode, and after installation, the butt joint faces of the two semi-cylindrical vibration reduction blocks are parallel to the segment end faces located on the two sides of the vibration reduction core rod; a viscoelastic damping layer is filled between the butt joint surfaces of the two semi-cylindrical vibration reduction blocks; the number of the elastic telescopic units is two, the two elastic telescopic units are coaxially and symmetrically arranged at the two ends of the damping core rod, and each elastic telescopic unit comprises two springs with different radiuses. The vibration reduction type positioning rod provided by the invention can effectively reduce the transmission of vibration between pipe pieces and reduce the vibration influence of a rail transit environment.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration reduction of rail transit structures, and in particular relates to a vibration reduction type shield tunnel segment positioning rod and a vibration reduction method thereof. Background Art

[0002] The connection mode and composition structure of the segment joint are highly correlated with the environmental vibration related to the shield tunnel. As a part of the segment joint, the positioning rod plays an important role in the transmission of vibration waves between segments. The traditional positioning rod is a PVC cylindrical rod with a length of 800mm and a diameter of φ50. It is embedded in the annular end face of the segment and always appears on the annular end face with a hand hole. This material and structure often cannot provide sufficient pressure dispersion effect and it is difficult to effectively reduce the impact and pressure on the segment.

[0003] In the current vibration reduction measures, changes in the segment joints will increase the overall structural complexity and cost. Therefore, it is necessary to develop an innovative, economical, effective and easy-to-install method without changing the original structure of the segment to solve this current problem.

[0004] Through the above analysis, the problems and defects of the existing technology are as follows: the traditional positioning rod only plays a positioning role, has no buffering ability, and cannot provide effective vibration reduction effect under different formations and working conditions. Summary of the invention

[0005] In view of the problems existing in the above-mentioned technologies, the present invention proposes a vibration-damping shield tunnel segment positioning rod and a vibration-damping method thereof, which can effectively reduce the transmission of vibration between segments while positioning the segments, thereby reducing the impact of vibration on the rail transit environment.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] A vibration-damping shield tunnel segment positioning rod, arranged at the joint of two adjacent segments, comprises:

[0008] The vibration-damping core rod is formed by butting two semi-cylindrical vibration-damping blocks. After installation, the butting surfaces of the two semi-cylindrical vibration-damping blocks are parallel to the end surfaces of the pipe segments on both sides of the vibration-damping core rod, and a viscoelastic damping layer is filled between the butting surfaces of the two semi-cylindrical vibration-damping blocks.

[0009] The elastic telescopic unit comprises two elastic telescopic units, which are coaxially symmetrically arranged at two ends of the vibration-damping core rod, and each of the elastic telescopic units comprises two springs with different radii, namely an inner spring and an outer spring, and the inner spring and the outer spring are coaxially connected through a rigid rotating member. After the connection, the lower half of the inner spring is connected in parallel with the lower half of the outer spring, and the upper half of the inner spring is connected in series with the parallel part through the rigid rotating member;

[0010] Also includes:

[0011] A support seat is arranged between the elastic telescopic unit and the vibration-damping core rod, a guide rod is arranged on the support seat toward the center of one side of the elastic telescopic unit, and the other end of the guide rod is cantilevered toward the vibration-damping head;

[0012] The center of the rigid rotating member is provided with a rod hole for the guide rod to pass through;

[0013] One end of the two inner springs away from the vibration-damping core rod is respectively connected to a vibration-damping head;

[0014] The housing is formed by butting two arc-shaped plates with semicircular cross sections, and is arranged to cover the outside of the vibration-damping core rod and the elastic expansion unit. After installation, the butt joint surfaces of the two arc-shaped plates are parallel to the butt joint surfaces of the two semi-cylindrical vibration-damping blocks;

[0015] The vibration-damping head is arranged to protrude from the housing along the axial direction of the positioning rod.

[0016] In the two semi-cylindrical vibration damping blocks, the end faces of the first semi-cylindrical vibration damping block and the end faces of the second semi-cylindrical vibration damping block are both provided with rectangular protrusions at intervals along the radial direction of the vibration damping core rod, and rectangular grooves are formed between adjacent rectangular protrusions. The rectangular grooves are consistent in size with the rectangular protrusions, and the position of the rectangular groove on the end face of the first semi-cylindrical vibration damping block corresponds to the position of the rectangular protrusion on the end face of the second semi-cylindrical vibration damping block.

[0017] The dimensions of the inner spring and the outer spring satisfy the following three relationships at the same time:

[0018] D i +d i <D o +d o ,

[0019]

[0020] Among them, D i D is the inner spring diameter o is the outer spring middle diameter, d i is the inner spring wire diameter, d o is the outer spring wire diameter.

[0021] The other end of the inner spring away from the support seat is connected to a cylindrical connecting block, and the cylindrical connecting block is arranged in a stepped shaft along the axial direction, which are the first shaft section, the second shaft section and the third shaft section whose shaft diameters decrease successively from the vibration damping head to the inner spring direction, wherein,

[0022] The top of the first shaft section is provided with a groove for combining with the vibration damping head;

[0023] The second shaft section is used for plugging and matching with the housing.

[0024] A sealing ring is provided between the end of the housing and the first shaft segment.

[0025] The inner wall of the semicircular arc plate is provided with a limiting protrusion for limiting the axial and circumferential position of the semi-cylindrical vibration damping block, and the end of the semi-cylindrical vibration damping block is provided with a fixing groove for matching with the limiting protrusion.

[0026] The shell is made of carbon fiber composite material.

[0027] The vibration damping head is made of rubber.

[0028] The present invention further discloses a vibration reduction method based on the vibration reduction type shield tunnel segment positioning rod. After the shield tunnel segment is subjected to train load, adjacent segments will be subjected to forces in two directions, namely, the squeezing force between adjacent segments along the circumferential direction of the pipe diameter and the dislocation force between adjacent segments along the axial direction of the pipe diameter.

[0029] When adjacent segments are subjected to extrusion pressure along the circumferential direction of the tube diameter, the outer shell composed of the two arc-shaped plates transmits the force to the two semi-cylindrical vibration-damping blocks, and the viscoelastic damping layer arranged between the two semi-cylindrical vibration-damping blocks dissipates the vibration energy, thereby reducing the vibration amplitude and energy transfer;

[0030] When adjacent pipe segments are subjected to a displacing force along the pipe diameter axis, the rigid rotating member is driven to move by the change in stiffness caused by the tension and compression of the inner and outer springs, thereby dissipating the vibration.

[0031] Combining all the above technical solutions, the advantages and positive effects of the present invention are as follows:

[0032] First, the vibration-damping shield tunnel segment positioning rod of the present invention, when adjacent segments are subjected to extrusion pressure along the circumferential direction of the pipe diameter, the outer shell composed of two arc-shaped plates transmits the force to the two semi-cylindrical vibration-damping blocks, and the viscoelastic damping layer arranged between the two semi-cylindrical vibration-damping blocks realizes the dissipation of vibration energy to reduce the amplitude of vibration and energy transfer; when adjacent segments are subjected to dislocation force along the axial direction of the pipe diameter, the rigid rotating part is driven to move by the change in stiffness when the inner and outer springs are stretched and compressed, thereby dissipating the vibration, which can effectively reduce the amplitude of vibration and energy transfer.

[0033] Second, the axial spring vibration reduction device of the present invention can be adjusted according to specific geological conditions and construction requirements. The stiffness of the structure can be changed by adjusting the number of spring coils, wire diameter, etc. This flexibility makes the structure very suitable for coping with complex and changeable working conditions and environments, and provides a stable vibration reduction effect in different working conditions.

[0034] Third, the shell material of the present invention adopts carbon fiber composite material. Compared with the PVC material used in the traditional positioning rod, the carbon fiber composite material has very high strength and rigidity, and is light in weight, which enables it to reduce the weight of the overall structure while maintaining strength, and has good corrosion resistance, is not easily corroded by chemical substances, and has a longer service life. At the same time, it has good design flexibility, and various complex structures and performance requirements can be achieved through different weaving methods and material combinations. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the positioning rod damping core provided by an embodiment of the present invention;

[0036] Figure 2 is a schematic structural diagram of an axial spring vibration reduction device provided in an embodiment of the present invention;

[0037] Figure 3 This is a diagram showing the assembly relationship between the rigid rotating member and the spring of the present invention;

[0038] Figure 4 It is a structural schematic diagram of the rigid rotating member of the present invention;

[0039] Figure 5 It is a schematic diagram of the connection structure of the inner spring and the outer spring of the present invention;

[0040] Figure 6 It is a schematic structural diagram of an arc-shaped plate having a semicircular cross section according to the present invention;

[0041] Figure 7 It is a schematic diagram of the connection structure between a semicircular arc plate and a semi-cylindrical vibration damping block;

[0042] Figure 8 It is a schematic diagram of the assembly of the vibration damping core rod and the housing;

[0043] Fig. 9 It is a schematic diagram of the overall structure of the positioning rod of the present invention;

[0044] Fig.10 It is a structural schematic diagram of the vibration-damping core rod of the present invention;

[0045] Fig.11 is a side view of a positioning rod provided by an embodiment of the present invention after installation on a pipe segment;

[0046] In the figure: 1. vibration-damping head; 2. outer spring; 3. inner spring; 4. guide rod; 5. rigid rotating part; 6. semi-cylindrical vibration-damping block; 7. placement groove; 8. fixing groove; 9. viscoelastic damping layer; 10. outer shell; 11. shield tunnel segment; 12. sealing strip; 13. vibration-damping positioning rod. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0048] Example 1, reference Figure 1-4 As shown, a vibration-damping shield tunnel segment positioning rod is arranged at the joint of two adjacent segments, comprising:

[0049] The vibration-damping core rod is formed by butting two semi-cylindrical vibration-damping blocks 6. After installation, the butting surfaces of the two semi-cylindrical vibration-damping blocks 6 are parallel to the end surfaces of the pipe segments on both sides of the vibration-damping core rod, and a viscoelastic damping layer 9 is filled between the butting surfaces of the two semi-cylindrical vibration-damping blocks 6.

[0050] The elastic telescopic unit comprises two elastic telescopic units, which are coaxially symmetrically arranged at the two ends of the damping core rod. Each of the elastic telescopic units comprises two springs with different radii, namely an inner spring 3 and an outer spring 2. The inner spring 3 and the outer spring 2 are coaxially connected through a rigid rotating member 5. After the connection, the lower half of the inner spring 3 is connected in parallel with the lower half of the outer spring 2, and the upper half of the inner spring 3 is connected in series with the parallel part through the rigid rotating member 5.

[0051] Also includes:

[0052] A support seat is arranged between the elastic telescopic unit and the vibration-damping core rod, a guide rod 4 is arranged on the support seat toward the center of one side of the elastic telescopic unit, and the other end of the guide rod 4 is cantilevered toward the vibration-damping head 1;

[0053] The center of the rigid rotating member 5 is provided with a rod hole for the guide rod 4 to pass through;

[0054] One end of the two inner springs away from the vibration-damping core rod is respectively connected to a vibration-damping head 1;

[0055] The housing 10 is formed by butting two arc-shaped plates with semicircular cross sections, and is arranged to cover the outside of the vibration-damping core rod and the elastic expansion unit. After installation, the butt joint surfaces of the two arc-shaped plates are parallel to the butt joint surfaces of the two semi-cylindrical vibration-damping blocks 6;

[0056] The vibration damping head 1 is arranged to protrude from the housing 10 along the axial direction of the positioning rod.

[0057] Axial spring vibration reduction device: Its function is to prevent the transmission of axial vibration waves of the positioning rod. The device includes two springs with different radii, namely, inner spring 3, outer spring 2, rigid rotating part 5 and guide rod 4. When in use, the inner spring 3 is connected to the vibration reduction head 1 through a composite embedded method of placing groove 7 and glue adhesion.

[0058] The inner and outer springs are concentrically distributed, the guide rod 4 passes through the rigid rotating member 5, the rigid rotating member 5 connects the inner spring and the outer spring, and divides the spring into two parts, the lower half of the inner spring 3 is connected in parallel with the lower half of the outer spring 2, and the upper half of the inner spring 3 is connected in series with the parallel part through the rigid rotating member 5. The stiffness of the whole spring is determined by the whole inner spring 3 and the lower half of the outer spring 2, and the upper half of the outer spring 2 does not participate in the stiffness adjustment.

[0059] The overall spring stiffness K is calculated according to the following formula:

[0060]

[0061] Among them, k 1,o is the stiffness of the parallel part of the outer spring, k 2,i is the stiffness of the parallel part of the inner spring, k 3,i is the stiffness of the series part of the inner spring.

[0062] Viscoelastic vibration damping device: includes a viscoelastic damping layer 9 and two semi-cylindrical vibration damping blocks 6, wherein the viscoelastic damping layer 9 is filled between the inner walls of the gaps of the cylindrical vibration damping blocks. The inner wall of the semi-circular arc plate is provided with a limiting protrusion for limiting the axial and circumferential positions of the semi-cylindrical vibration damping blocks 6, and the ends of the semi-cylindrical vibration damping blocks 6 are provided with a fixing groove for matching with the limiting protrusion.

[0063] The semi-cylindrical vibration-damping block 6 has a rectangular wave-shaped gap, which is beneficial to increasing the area of ​​the viscoelastic damping layer 9 and improving the vibration-damping effect.

[0064] Preferably, the material of the housing 11 is a carbon fiber composite material. Compared with the PVC material used in the traditional positioning rod, the carbon fiber composite material has very high strength and rigidity, and is light in weight, which enables it to reduce the weight of the overall structure while maintaining strength, and has good corrosion resistance and is not easily corroded by chemical substances, which makes it have a longer service life in harsh environments. At the same time, it has good design flexibility, and various complex structures and performance requirements can be achieved through different weaving methods and material combinations.

[0065] The final structure of the vibration damping positioning rod of the present invention is as follows: Figure 5 shown.

[0066] When the shield tunnel segments are subjected to train loads, adjacent segments will be subjected to forces in two directions, namely, the squeezing force between adjacent segments along the circumferential direction of the pipe diameter and the dislocation force between adjacent segments along the axial direction of the pipe diameter.

[0067] When the segments are displaced along the axial direction of the pipe diameter, the positioning rod is subjected to axial vibration, and the vibration-damping head 1 will drive the inner spring 3 to extend or shorten, which is transmitted to the outer spring 2 through the rigid rotating part. Therefore, when subjected to different vibrations, the stiffness of the overall spring will also change, which can prevent the movement of the vibration-damping head 1 to a certain extent. Therefore, the use of the positioning rod can adapt to the different amplitudes generated during the operation of the subway, thereby providing a stable, accurate and wider range of vibration reduction effects; at the same time, due to the different compression and extension amounts of the inner and outer springs, the rigid rotating part 5 moves axially, ultimately achieving the purpose of dissipating vibration.

[0068] When the positioning rod is subjected to the extrusion vibration between the segments along the circumferential direction of the pipe diameter, the vibration will be transmitted to the semi-cylindrical vibration damping block 6 through the shell 10, driving the semi-cylindrical vibration damping block to move slightly. The viscoelastic damping force provided by the viscoelastic damping layer 9 will suppress the change in the distance between the semi-cylindrical vibration damping blocks 6, thereby reducing the transmission of vibration.

[0069] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0070] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principles of the present invention should be covered within the protection scope of the present invention.

Claims

1. A vibration-damping shield tunnel segment positioning rod, arranged at the joint between two adjacent segments, characterized in that: include: The vibration-damping core rod is formed by butting two semi-cylindrical vibration-damping blocks. After installation, the butting surfaces of the two semi-cylindrical vibration-damping blocks are parallel to the end surfaces of the pipe segments on both sides of the vibration-damping core rod, and a viscoelastic damping layer is filled between the butting surfaces of the two semi-cylindrical vibration-damping blocks. The elastic telescopic unit comprises two elastic telescopic units, which are coaxially symmetrically arranged at two ends of the vibration-damping core rod, and each of the elastic telescopic units comprises two springs with different radii, namely an inner spring and an outer spring, and the inner spring and the outer spring are coaxially connected through a rigid rotating member. After the connection, the lower half of the inner spring is connected in parallel with the lower half of the outer spring, and the upper half of the inner spring is connected in series with the parallel part through the rigid rotating member; Also includes: A support seat is arranged between the elastic telescopic unit and the vibration-damping core rod, a guide rod is arranged on the support seat toward the center of one side of the elastic telescopic unit, and the other end of the guide rod is cantilevered toward the vibration-damping head; The center of the rigid rotating member is provided with a rod hole for the guide rod to pass through; One end of the two inner springs away from the vibration-damping core rod is respectively connected to a vibration-damping head; The housing is formed by butting two arc-shaped plates with semicircular cross sections, and is arranged to cover the outside of the vibration-damping core rod and the elastic expansion unit. After installation, the butt joint surfaces of the two arc-shaped plates are parallel to the butt joint surfaces of the two semi-cylindrical vibration-damping blocks; The vibration-damping head is arranged to protrude from the housing along the axial direction of the positioning rod.

2. The vibration-damping shield tunnel segment positioning rod according to claim 1 is characterized in that: In the two semi-cylindrical vibration damping blocks, the end faces of the first semi-cylindrical vibration damping block and the end faces of the second semi-cylindrical vibration damping block are both provided with rectangular protrusions at intervals along the radial direction of the vibration damping core rod, and rectangular grooves are formed between adjacent rectangular protrusions. The rectangular grooves are consistent in size with the rectangular protrusions, and the position of the rectangular groove on the end face of the first semi-cylindrical vibration damping block corresponds to the position of the rectangular protrusion on the end face of the second semi-cylindrical vibration damping block.

3. The vibration-damping shield tunnel segment positioning rod according to claim 1 is characterized in that: The dimensions of the inner spring and the outer spring satisfy the following three relationships at the same time: D i +d i <D o +d o , Among them, D i D is the inner spring diameter o is the outer spring middle diameter, d i is the inner spring wire diameter, d o is the outer spring wire diameter.

4. The vibration-damping shield tunnel segment positioning rod according to claim 1, characterized in that: The other end of the inner spring away from the support seat is connected to a cylindrical connecting block, and the cylindrical connecting block is arranged in a stepped shaft along the axial direction, which are the first shaft section, the second shaft section and the third shaft section whose shaft diameters decrease successively from the vibration damping head to the inner spring, wherein: The top of the first shaft section is provided with a groove for combining with the vibration damping head; The second shaft section is used for plugging and matching with the housing.

5. A vibration-damping shield tunnel segment positioning rod according to claim 4, characterized in that: A sealing ring is provided between the end of the housing and the first shaft segment.

6. The vibration-damping shield tunnel segment positioning rod according to claim 1, characterized in that: The inner wall of the semicircular arc plate is provided with a limiting protrusion for limiting the axial and circumferential position of the semi-cylindrical vibration damping block, and the end of the semi-cylindrical vibration damping block is provided with a fixing groove for matching with the limiting protrusion.

7. The vibration-damping shield tunnel segment positioning rod according to claim 1, characterized in that: The shell is made of carbon fiber composite material.

8. The vibration-damping shield tunnel segment positioning rod according to claim 1, characterized in that: The vibration damping head is made of rubber.

9. A vibration reduction method based on the vibration reduction type shield tunnel segment positioning rod according to any one of claims 1 to 8, characterized in that: When the shield tunnel segments are subjected to train loads, adjacent segments will be subjected to forces in two directions, namely, the squeezing force between adjacent segments along the circumferential direction of the pipe diameter and the dislocation force between adjacent segments along the axial direction of the pipe diameter. When adjacent segments are subjected to extrusion pressure along the circumferential direction of the tube diameter, the outer shell composed of the two arc-shaped plates transmits the force to the two semi-cylindrical vibration-damping blocks, and the viscoelastic damping layer arranged between the two semi-cylindrical vibration-damping blocks dissipates the vibration energy, thereby reducing the vibration amplitude and energy transfer; When adjacent pipe segments are subjected to a displacing force along the pipe diameter axis, the rigid rotating member is driven to move by the change in stiffness caused by the tension and compression of the inner and outer springs, thereby dissipating the vibration.

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