A vibration reduction type shield tunnel segment positioning rod and a vibration reduction method thereof

Abstract

The application discloses a damping type shield tunnel segment positioning rod and a damping method thereof. The positioning rod comprises a damping core rod which is formed by butt joint of two half-cylindrical damping blocks. After installation, butt joint surfaces of the two half-cylindrical damping blocks are parallel to segment end surfaces located on both sides of the damping core rod, and a viscoelastic damping layer is filled between the butt joint surfaces of the two half-cylindrical damping blocks. The elastic expansion units are coaxially and symmetrically arranged at both ends of the damping core rod, and each elastic expansion unit comprises two springs with different radii. The damping type positioning rod can effectively reduce the transmission of vibration between segments and reduce the influence of environmental vibration of rail transit.

Description

Technical Field

[0001] The present 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 method and structure of segment joints are highly correlated with the ambient vibration associated with shield tunneling. As a component of the segment joint, the locating rod plays a crucial role in the transmission of vibration waves between segments. Traditionally, the locating rod is a PVC cylindrical rod 800 mm long and φ50 mm in diameter. It is embedded in the circumferential end face of the segment, typically located on the face with the handhole. This material and structure often fail to provide adequate pressure dissipation, making it difficult to effectively reduce the impact and pressure on the segments.

[0003] Current vibration reduction measures often increase overall structural complexity and cost by modifying the segment joints. Therefore, it is necessary to develop an innovative, economical, effective, and easy-to-install method to address this issue without changing the original segment structure.

[0004] Through the above analysis, the problems and defects of the existing technology are: 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 response to 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 between two adjacent segments, comprising:

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

[0009] The elastic telescopic units include two units, which are coaxially and symmetrically arranged at both ends of the vibration-damping core rod. Each elastic telescopic unit includes two springs with different radii, namely an inner spring and an outer spring. The inner spring and the outer spring are coaxially connected via 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 via the rigid rotating member.

[0010] Also includes:

[0011] A support seat is provided between the elastic telescopic unit and the vibration-damping core rod, wherein a guide rod is provided 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] A rod hole for the guide rod to pass through is provided at the center of the rigid rotating member;

[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 together 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, namely the first shaft section, the second shaft section and the third shaft section whose shaft diameters decrease in sequence from the vibration damping head to the inner spring, 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 plug-in cooperation with the shell.

[0024] A sealing ring is arranged between the end of the shell and the first shaft section.

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

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

[0027] The damping head is made of rubber.

[0028] The application further discloses a damping method based on the damping type shield tunnel segment positioning rod.

[0029] When the adjacent segments are subjected to the extrusion force along the circumferential direction of the pipe diameter, the shell composed of the two arc-shaped plates transmits the force to the two semicircular cylindrical damping blocks, and the vibration energy is dissipated through the viscoelastic damping layer arranged between the two semicircular cylindrical damping blocks, so that the amplitude of vibration and energy transmission are reduced.

[0030] When the adjacent segments are subjected to the extrusion force along the circumferential direction of the pipe diameter, the shell composed of the two arc-shaped plates transmits the force to the two semicircular cylindrical damping blocks, and the vibration energy is dissipated through the viscoelastic damping layer arranged between the two semicircular cylindrical damping blocks, so that the amplitude of vibration and energy transmission are reduced.

[0031] In combination with all the above technical solutions, the application has the following advantages and positive effects:

[0032] First, the damping type shield tunnel segment positioning rod can effectively reduce the amplitude of vibration and energy transmission.

[0033] Second, the axial spring damping device can be adjusted according to specific geological conditions and construction requirements, and the stiffness of the structure can be changed by adjusting the number of spring coils and the wire diameter.

[0034] Third, the shell material of this invention is made of carbon fiber composite material. Compared with the PVC material used in traditional positioning rods, carbon fiber composite material has very high strength and rigidity, and is lighter in weight. This allows it to reduce the weight of the overall structure while maintaining strength. It also has excellent corrosion resistance and is not easily corroded by chemicals, which prolongs its service life. It also 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 Schematic diagram of the structure of the positioning rod damping core provided by an embodiment of the present invention;

[0036] Figure 2 Schematic diagram of the structure of the axial spring vibration reduction device provided by 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 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 a curved plate having a semicircular cross section according to the present invention;

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

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

[0043] Figure 9 Schematic diagram of the overall structure of the positioning rod of the present invention;

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

[0045] Figure 11 This 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 objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the concept of the present application, so the present application is not limited to the specific implementations disclosed below.

[0048] Embodiment 1, refer to Figure 1-4 As shown in the figure, a vibration reduction type shield tunnel segment positioning rod is arranged at the joint of two adjacent segments, comprising:

[0049] The vibration reduction core rod is formed by butting two semi-cylindrical vibration reduction blocks 6, after installation, the butt joint surface of the two semi-cylindrical vibration reduction blocks 6 is parallel to the end surface of the segment located on both sides of the vibration reduction core rod, and a viscoelastic damping layer 9 is filled between the butt joint surfaces of the two semi-cylindrical vibration reduction blocks 6;

[0050] The elastic expansion unit includes two, the two elastic expansion units are coaxially and symmetrically arranged at both ends of the vibration reduction core rod, each elastic expansion unit includes two springs with different radii, which are 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 part 5, after 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 part 5;

[0051] Further comprising:

[0052] The support seat is arranged between the elastic expansion unit and the vibration reduction core rod, a guide rod 4 is arranged on the support seat and faces the center of the side surface of the elastic expansion unit, and the other end of the guide rod 4 is cantilevered towards the vibration reduction head 1;

[0053] The center of the rigid rotating part 5 is provided with a rod hole through which the guide rod 4 passes;

[0054] The two inner springs are respectively connected with a vibration reduction head 1 at the end away from the vibration reduction core rod;

[0055] The shell 10 is formed by butt joint of two arc-shaped plates with semicircular cross section, and is arranged outside the vibration reduction core rod and the elastic expansion unit, after installation, the butt joint surface of the two arc-shaped plates is parallel to the butt joint surface of the two semi-cylindrical vibration reduction blocks 6;

[0056] The vibration reduction head 1 is arranged on the shell 10 in the axial direction of the positioning rod.

[0057] Axial spring damping device: Its function is to prevent the transmission of axial vibration waves from the positioning rod. This device includes two springs of different radii: an inner spring 3, an outer spring 2, a rigid rotating member 5, and a guide rod 4. In use, the inner spring 3 is connected to the damping head 1 through a composite embedded method of placement groove 7 and adhesive bonding.

[0058] The inner and outer springs are concentrically arranged. A guide rod 4 passes through a rigid rotating member 5, which connects the inner and outer springs and divides the spring into upper and lower sections. The lower half of the inner spring 3 is connected in parallel with the lower half of the outer spring 2, while the upper half of the inner spring 3 is connected in series with the parallel section via the rigid rotating member 5. The stiffness of the entire spring is determined by the entire inner spring 3 and the lower half of the outer spring 2; the upper half of the outer spring 2 does not participate in 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] The viscoelastic vibration damping device comprises a viscoelastic damping layer 9 and two semi-cylindrical vibration damping blocks 6. The viscoelastic damping layer 9 fills the gap between the inner walls of the cylindrical vibration damping blocks. The inner walls of the semi-circular arc plates are provided with limiting protrusions that limit the axial and circumferential position of the semi-cylindrical vibration damping blocks 6. The ends of the semi-cylindrical vibration damping blocks 6 are provided with fixing grooves that cooperate with the limiting protrusions.

[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 housing 11 is made of a carbon fiber composite material. Compared to the PVC material used in traditional positioning rods, carbon fiber composite materials have significantly higher strength and rigidity, while being lighter. This allows them to reduce the weight of the overall structure while maintaining strength. They also have excellent corrosion resistance and are less susceptible to chemical attack, extending their service life in harsh environments. They also offer excellent design flexibility, allowing for the realization of various complex structures and performance requirements 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 shield tunnel segments are subjected to train loads, adjacent segments will be subjected to forces in two directions: the extrusion force along the circumference of the tube diameter and the dislocation force along the axial direction of the tube diameter.

[0067] When axial displacement occurs between the pipe segments along 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 entire spring will also change, which can prevent the movement of the vibration-damping head 1 to a certain extent. Therefore, the use of this positioning rod can adapt to the different amplitudes generated during the operation of the subway, thereby providing a stable, accurate and more adaptable vibration reduction effect; at the same time, due to the different compression and extension amounts of the inner and outer springs, the rigid rotating part 5 performs axial movement, ultimately achieving the purpose of dissipating vibration.

[0068] When the positioning rod is subjected to circumferential compression vibration between the segments, the vibration is transmitted through the outer shell 10 to the semi-cylindrical vibration damping block 6, causing it to move slightly. The viscoelastic damping force provided by the viscoelastic damping layer 9 suppresses 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 focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0070] The above description is only a preferred specific implementation method of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with this technical field within the technical scope disclosed by the present invention and within the spirit and principles of the present invention should be covered by the scope of protection 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 together. After installation, the butting surfaces of the two semi-cylindrical vibration damping blocks are parallel to the end faces of the pipe segments on both sides of the vibration damping core rod. A viscoelastic damping layer is filled between the butting surfaces of the two semi-cylindrical vibration damping blocks. The elastic telescopic units include two units, which are coaxially and symmetrically arranged at both ends of the vibration-damping core rod. Each elastic telescopic unit includes two springs with different radii, namely an inner spring and an outer spring. The inner spring and the outer spring are coaxially connected via 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 via the rigid rotating member. Also includes: A support seat is provided between the elastic telescopic unit and the vibration-damping core rod, wherein a guide rod is provided 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; A rod hole for the guide rod to pass through is provided at the center of the rigid rotating member; 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 together 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, 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, 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, namely the first shaft section, the second shaft section and the third shaft section whose shaft diameters decrease in sequence 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. The 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 for a shield tunnel segment positioning rod based on any one of claims 1 to 8, characterized in that: When shield tunnel segments are subjected to train loads, adjacent segments will be subjected to forces in two directions: the extrusion force along the circumference of the tube diameter and the dislocation force along the axial direction of the tube diameter. When adjacent segments are subjected to circumferential squeezing force, the outer shell composed of the two arc-shaped plates transmits the force to the two semi-cylindrical vibration-damping blocks. The viscoelastic damping layer disposed 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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