Shield tunnel sealing strip contact constitutive test device and test method

Abstract

This invention discloses a test device and method for the contact constitutive characteristics of sealing strips in shield tunnel segments. The test device includes: a support frame located at the bottom of the entire device; a pressure clamping mechanism disposed on the upper part of the support frame; two cement blocks, arranged side by side on the pressure clamping mechanism, namely a first cement block and a second cement block, with sealing strips arranged opposite each other on the adjacent sidewalls of the two cement blocks; the pressure clamping mechanism is used to provide pre-tightening force to the sealing strips; a hammering vibration mechanism is used to apply hammering vibration from top to bottom to the two cement blocks; a thin-film vibration acceleration sensor is disposed between the cement blocks and the sealing strips; and a thin-film stress sensor is disposed on the contact surface between the two sealing strips. By using the above-mentioned devices, while obtaining the contact stiffness, i.e., stress-strain characteristics, of the sealing strips, the damping characteristics of the sealing strip contact can also be obtained, which is beneficial for obtaining more accurate shield tunnel vibration calculation results and provides a method for obtaining damping characteristics in numerical calculation software.

Description

Technical Field

[0001] This invention relates to testing methods and apparatus in the field of material performance testing and constitutive modeling, and particularly to a test apparatus and method for testing the contact constitutive model of a shield tunnel sealing strip. Background Technology

[0002] With the rapid development of urban rail transit construction, the vibration problems caused by its operation have attracted widespread attention. Shield tunnels, as the mainstream form of underground urban rail construction today, differ from the traditional "step-by-step pouring" method of tunnels. They are constructed by splicing together a large number of segments, resulting in a significantly different propagation pattern of vibration waves in shield tunnels compared to tunnels constructed using traditional pouring methods. Research on shield tunnel vibration has shown that the contact between shield tunnel segments has significant damping characteristics. However, existing constitutive devices and methods for measuring the contact stiffness (stress-strain characteristics) of shield tunnel sealing strips can only obtain the contact stiffness of the sealing strips, not the damping characteristics of the contact.

[0003] Unlike traditionally cast-in-place tunnels, shield tunnels contain numerous joints and contact surfaces created by the splicing of tunnel segments. This results in significantly different vibration wave propagation patterns compared to tunnels constructed using traditional methods. The joints between tunnel segments (the contact surfaces of two segments) typically consist of two parts: "cement-cement" and "sealing strip-sealing strip." Vibration propagation characteristics differ between these two parts. However, existing research on the contact between sealing strips only examines the stress-strain characteristics of this contact, lacking relevant testing methods and equipment for one of the key factors influencing vibration propagation—damping. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a testing device that can simulate the working state of the sealing strip of the shield tunnel segment, and a testing method for obtaining the constitutive relationship of the contact between the sealing strips using the device.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: On one hand, a test device for the contact constitutive testing of shield tunnel segment sealing strips is provided, comprising:

[0006] The support frame is located at the very bottom of the entire device;

[0007] A pressure clamping mechanism is provided on the upper part of the support frame;

[0008] Two cement blocks are arranged side by side on the pressure clamping mechanism, namely the first cement block and the second cement block, and two sealing strips are provided on the adjacent side walls of the two cement blocks.

[0009] The pressure clamping mechanism is used to provide pre-tightening force to the sealing strip;

[0010] A hammering vibration mechanism is used to apply a top-down hammering vibration to the two cement blocks;

[0011] A thin-film vibration acceleration sensor is disposed between the cement block and the sealing strip;

[0012] A thin-film stress sensor is disposed on the contact surface between the two sealing strips.

[0013] In a preferred embodiment of the present invention, the pressure clamping mechanism includes:

[0014] A linear slide rail is fixedly connected to the top of the support frame;

[0015] Two clamping arms are slidably mounted on the linear slide rail, and the two clamping arms can move towards each other on the linear slide rail; a distance adjustment mechanism is used to adjust the clamping distance between the two clamping arms;

[0016] The two cement blocks are sandwiched between two clamping arms.

[0017] In a preferred embodiment of the present invention: three linear slide rails are arranged sequentially along the length of the cement, and each linear slide rail is provided with two clamping arms. The linear slide rail in the middle is the first linear slide rail, and the clamping arm on the first linear slide rail is the first clamping arm; the linear slide rails on both sides are the second linear slide rails, and the clamping arms on the second linear slide rails are the second clamping arms. The distance adjustment mechanism is provided on the first clamping arm, and the second clamping arm and the first clamping arm move synchronously through a connecting member.

[0018] In a preferred embodiment of the present invention, the distance adjustment mechanism includes:

[0019] The screw is threadedly connected to the threaded holes provided at the bottom of the two first clamping arms, and the internal threads in the threaded holes of the two first clamping arms are in opposite directions;

[0020] A turntable, located on one side of the first clamping arm, is fixedly connected to one end of the screw and is used to rotate the screw.

[0021] In a preferred embodiment of the present invention: a groove is provided at the bottom of the second clamping arm, and a roller is fixedly provided at the top of the second linear track to reduce the friction when the clamping arms approach each other, and the groove of the second clamping arm and the roller provided at the top of the second linear track are in clearance fit.

[0022] In a preferred embodiment of the present invention, the hammering vibration mechanism includes:

[0023] The base has a fixed column on its upper side;

[0024] A cantilever beam has a cantilever horizontally positioned at the top, with a transverse sliding groove on the cantilever. One end of the cantilever is fixedly connected to a vertically positioned limiting sleeve. The bottom of the limiting sleeve is open, and the bottom opening matches the outer diameter of a fixing column. Limiting holes are equidistantly positioned on the side of the limiting sleeve along the height direction. The fixing column is inserted into the limiting sleeve to fix the cantilever beam to the fixing column, and the height of the cantilever beam is adjusted by bolts and limiting holes.

[0025] A support platform is disposed on one side of the base and located below the support frame;

[0026] A hammering component, slidably connected to a groove in the cantilever beam, is used to hammer the two cement blocks, and includes: a fixing frame slidably disposed on the cantilever beam;

[0027] The drive wheel is located on the upper side of the fixed frame and is connected to the outdoor unit drive.

[0028] The driven wheel is located on the lower side of the fixed bracket and is connected to the driving wheel via a conveyor belt. A steel cable is wound on the driven wheel.

[0029] The hammer holder is fixedly connected at its upper end to the free end of the steel cable, and a vibrating hammer is fixedly installed at its lower end.

[0030] In a preferred embodiment of the present invention, the upper part of the vibrating hammer is a cylindrical iron block, and the lower part is a hemispherical protrusion, wherein the hemispherical protrusion is an elastic rubber hemisphere.

[0031] In a preferred embodiment of the present invention, the support frame includes:

[0032] A cylindrical support column 44 is disposed below the second linear guide rail to support the pressure clamping mechanism.

[0033] A transverse connecting strip is disposed between the linear guide rail and the cylindrical support column 44;

[0034] The first linear guide rail is fixedly installed in the middle of the transverse connecting strip, and the second linear guide rail is welded to the cylindrical support column 44 and the transverse connecting strip.

[0035] On the other hand, a test method for a shield tunnel segment sealing strip contact constitutive test device is provided, including the following steps:

[0036] Step 1: Confirm the size of the cement block, place two sealing strips on the two cement blocks respectively, and connect the cement blocks and sealing strips by grouting and adhesive. Set the thin film vibration acceleration sensor on the contact surface between the sealing strip and the cement block, and set the thin film stress sensor on the contact surface between the two sealing strips.

[0037] Step 2: After moving the cement block to make the two sealing strips stick together, place the cement block as a whole on the pressure clamping mechanism, clamp the cement block by the pressure clamping mechanism and apply pressure to the two cement blocks, and observe the reading of the stress sensor. When the stress sensor reading is equal to 0 or close to 0, record the distance between the two cement blocks.

[0038] Step 3: Continue to apply pressure to the two cement blocks through the pressure clamping mechanism, and stop the work of the distance adjustment mechanism at intervals. Record the spacing between the cement blocks and the stress sensor reading at this time. At the same time, start the vibratory hammer mechanism to repeatedly hammer the cement blocks and record the data of the vibration acceleration sensor.

[0039] Step 4: Repeat step 3 until the two cement blocks are in contact or the sealing strip is completely destroyed to complete the test;

[0040] Step 5: Based on the recorded data, obtain the relationship between the distance change and the stress recorded by the stress sensor, as well as the relationship between the vibration acceleration attenuation amplitude and the distance change; and obtain the contact damping coefficient at the terminal through experimental data.

[0041] Compared with the prior art, the present invention has the following advantages:

[0042] 1. The testing device and method described in this invention can simulate the working condition of the sealing strip. While obtaining the contact stiffness (stress-strain characteristics) of the sealing strip, it can also obtain the damping characteristics of the sealing strip contact. This overcomes the problem that existing devices and technologies cannot obtain accurate contact damping characteristics of shield tunnel sealing strips. It is beneficial for numerical calculation software to better simulate the contact characteristics of sealing strips in shield tunnels and obtain more accurate vibration calculation results of shield tunnels. It can provide a method for obtaining damping characteristics for numerical calculation software to simulate the propagation of vibration in shield tunnels and related structures.

[0043] 2. By setting up clamping arms and the synchronous movement of the three clamping arms, the sealing strip is ensured to be subjected to uniform force when the cement block is clamped.

[0044] 3. By setting rollers on the sliding track, the resistance when the clamping arms on both sides move is reduced, so that the cement block is subjected to uniform force.

[0045] 4. By setting up a hammering vibration mechanism, the horizontal and vertical positions of the hammering parts are adjusted, and the drive wheel is driven to move up and down by inputting reciprocating driving force, thereby driving the vibratory hammer to continuously hammer the cement block.

[0046] 5. The lower part of the vibratory hammer is made into an elastic rubber hemisphere to reduce the wear of the hammer and extend its life. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of the present invention;

[0048] Figure 2 This is a schematic diagram of the hammering component structure in this invention;

[0049] Figure 3 This is a schematic diagram of the vibration source support structure in this invention;

[0050] Figure 4 This is a schematic diagram of the pressure clamping mechanism in this invention;

[0051] Figure 5 This is a schematic diagram of the support frame structure in this invention.

[0052] 1 is the hammer, 11 is the rotating wheel, 12 is the fixed frame, 13 is the transmission belt, 14 is the hammer seat, 15 is the vibrating hammer, 2 is the hammering vibration mechanism, 21 is the cantilever beam, 22 is the base, 23 is the support platform, 3 is the pressure clamping mechanism, 31 is the clamping arm, 32 is the turntable, 33 is the screw, 34 is the sliding rod, 35 is the connecting part, 4 is the support frame, 41 is the roller, 42 is the linear slide rail, 43 is the transverse connecting strip, 44 is the cylindrical support column, 51 is the sealing strip, and 52 is the cement block. Detailed Implementation

[0053] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the invention. After reading this invention, any modifications of the invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0054] like Figure 1 The image shows a contact constitutive testing device for the sealing strip of a shield tunnel segment, comprising:

[0055] Support frame 4 is located at the very bottom of the entire device;

[0056] The pressure clamping mechanism 3 is disposed on the upper part of the support frame 4;

[0057] Two cement blocks 52 are arranged side by side on the pressure clamping mechanism 3, namely the first cement block and the second cement block, and two sealing strips are provided on the adjacent side walls of the two cement blocks.

[0058] The pressure clamping mechanism 3 is used to provide pre-tightening force to the sealing strip 51;

[0059] The hammering vibration mechanism 2 is used to apply a top-down hammering vibration to the two cement blocks 52;

[0060] A thin-film vibration acceleration sensor is disposed between the cement block 52 and the sealing strip 51;

[0061] A thin-film stress sensor is disposed on the contact surface between the two sealing strips 51.

[0062] The pressure clamping mechanism 3 includes:

[0063] The linear slide rail 42 is fixedly connected to the top of the support frame 4;

[0064] Two clamping arms 31 are slidably mounted on the linear slide rail 42, and the two clamping arms 31 can move towards each other on the linear slide rail 42;

[0065] A distance adjustment mechanism is used to adjust the clamping distance between the two clamping arms 31;

[0066] The two cement blocks are sandwiched between two clamping arms 31.

[0067] Three linear slide rails 42 are arranged sequentially along the length of the cement. Each linear slide rail 42 is equipped with two clamping arms 31. The linear slide rail 42 in the middle is the first linear slide rail 42, and the clamping arms 31 on the first linear slide rail 42 are the first clamping arms. The linear slide rails 42 on both sides are the second linear slide rails 42, and the clamping arms 31 on the second linear slide rail 42 are the second clamping arms. The distance adjustment mechanism is set on the first clamping arm, and the second clamping arm and the first clamping arm move synchronously through a connecting member 35.

[0068] The distance adjustment mechanism includes:

[0069] The screw 33 is threadedly connected to the threaded holes provided at the bottom of the two first clamping arms, and the internal threads in the threaded holes of the two first clamping arms are in opposite directions.

[0070] A turntable 32 is disposed on one side of the first clamping arm and is fixedly connected to one end of the screw 33 for rotating the screw 33.

[0071] The bottom of the second clamping arm is provided with a groove, and the top of the second linear track is fixedly provided with a roller 4 to reduce the friction when the clamping arm 31 approaches. The groove of the second clamping arm and the roller 4 provided at the top of the second linear track are in clearance fit.

[0072] The hammer vibration mechanism 2 includes:

[0073] The base 22 has a fixed column on its upper side;

[0074] The cantilever beam 21 has a cantilever horizontally arranged at the top, and a horizontal sliding groove is provided on the cantilever. One end of the cantilever is fixedly connected to a vertically arranged limiting sleeve. The bottom opening of the limiting sleeve matches the outer diameter of the fixing column, and the side of the limiting sleeve is provided with limiting holes at equal intervals along the height direction. The fixing column is inserted into the limiting sleeve to fix the cantilever beam 21 to the fixing column, and the height of the cantilever beam 21 is adjusted by bolts and limiting holes.

[0075] The support platform 23 is disposed on one side of the base 22 and located below the support frame;

[0076] The hammering component, which is slidably connected to the groove of the cantilever beam 21, is used to hammer the two cement blocks and includes: a fixing frame, which is slidably disposed on the cantilever beam 21;

[0077] The drive wheel is located on the upper side of the fixed frame and is connected to the outdoor unit drive.

[0078] The driven wheel is located on the lower side of the fixed bracket and is connected to the driving wheel via a conveyor belt. A steel cable is wound on the driven wheel.

[0079] The hammer holder 14 is fixedly connected at its upper end to the free end of the steel cable, and a vibrating hammer 15 is fixedly installed at its lower end.

[0080] The upper part of the vibrating hammer 15 is a cylindrical iron block, and the lower part is a hemispherical protrusion, which is an elastic rubber hemisphere.

[0081] The support frame includes:

[0082] A cylindrical support column 44 is disposed below the second linear guide rail to support the pressure clamping mechanism.

[0083] A transverse connecting strip 43 is disposed between the linear guide rail and the cylindrical support column 44;

[0084] The first linear guide rail is fixedly installed in the middle of the transverse connecting bar 43, and the second linear guide rail is welded to the cylindrical support column 44 and the transverse connecting bar 43.

[0085] This implementation case study presents a contact constitutive testing device and method for the sealing strip of a shield tunnel segment, such as... Figure 1 As shown, this specifically refers to a testing device composed of a hammer 1, a hammer vibration mechanism 2, a segment gradient pressurization device 3, a support frame 4, a sealing strip 51, and a cement block 52, which is used to test the contact stiffness and contact damping characteristics between sealing strips of shield tunnels.

[0086] The hammer assembly 1 consists of two rotating wheels 11, a shaped fixing frame 12, a conveyor belt 13, a hammer support 14, and a vibrating hammer 15. The rotating wheels 11 are fixed to the shaped fixing frame 12 via a fixed shaft, and the two rotating wheels 11 are connected by the conveyor belt 13. The upper rotating wheel 11 is the driving wheel, and the lower rotating wheel 11 is the driven wheel. Under external force (electric or manual drive), the driving wheel can drive the driven wheel to rotate via the conveyor belt 13. The driven wheel is connected to the hammer support 14 via a high-strength steel cable. One end of the steel cable is fixed to the driven wheel, and the other end is fixed to the upper surface of the hammer support 14. When the driving wheel is subjected to reciprocating driving force, the driven wheel rotates simultaneously, and the length of the free end of the steel cable changes vertically. Simultaneously, the hammer support 14 moves vertically along with the free end of the steel cable. The vibrating hammer 15 is a cylindrical iron block with a cylindrical groove at the top and a hemispherical protrusion at the bottom. The hemispherical protrusion is made of high-polymer elastic rubber to prevent damage to the cement block 52 when the hammer 15 comes into contact with it. The protrusion on the lower side of the hammer bracket 14 is threadedly connected to the groove on the top of the vibrating hammer 15. The vibrating hammer 15 can be replaced with hammers of different weights to produce different vibration effects.

[0087] The hammer vibration mechanism 2 consists of an "L"-shaped cantilever beam 21, a vibration source support base 22, and a special-shaped support 23. The cantilever end of the "L"-shaped cantilever beam 21 has a long, narrow opening. The hammer impactor 1 is placed in this opening via rollers on both sides of the special-shaped fixing frame 12, allowing it to move freely back and forth on the cantilever end of the "L"-shaped cantilever beam 21. The lower end of the "L"-shaped cantilever beam 21 is a cuboid with a cylindrical opening inside. The side surface has a number of circular openings covered with trapezoidal reinforcing protrusions. The vibration source support base 22 has a platform at the bottom and cylindrical protrusions welded to its upper surface. The cylindrical protrusions of the base of the hammer vibration mechanism 22 can be inserted into the cylindrical openings of the "L"-shaped cantilever beam 21, and bolts can be inserted into the circular openings on the side surface to fix the position of the "L"-shaped cantilever beam 21. The vibration source support base 22 is provided with an irregular support 23 near the cantilever end 21 of the "L"-shaped cantilever beam. The position of the irregular support 23 can be adjusted according to the hammer position to prevent the vibration source support from becoming unstable and tipping over.

[0088] The pressure clamping mechanism 3 consists of six clamping arms 31, a turntable 32, a screw 33 and a rigid connecting arm sliding rod 34. An "I"-shaped protrusion is welded under the clamping arm 31 in the middle, and a "mouth"-shaped long groove is welded under the four clamping arms 31 on both sides. The opening of the "mouth"-shaped groove is perpendicular to the lower surface of the clamping arms on both sides. The two first clamping arms in the middle are fixedly connected to the second clamping arms on both sides through a connecting piece 25, so that the clamping arms 31 move synchronously. The clamping arm 31 in the middle is connected by a screw 33. A turntable 32 is welded on the outside of the long screw 33. Spiral grooves corresponding to the threads of the screw 33 are provided inside the clamping arms 31 on both sides of the middle. By rotating the turntable 32, the distance between the double-bent rigid connecting arms can be shortened or extended. A rigid connecting arm sliding rod 34 is provided in the middle cavity of the double-bent clamping arms 31 on both sides to limit the lateral displacement of the double-bent clamping arms 31 on both sides.

[0089] The support frame 4 consists of a linear slide rail 42, a transverse connecting bar 43 and a cylindrical support column 44. An "mouth"-shaped long groove with the same width as the lower side of the clamping arm 31 is welded on the top of the linear slide rail 42. A long rail with a "door"-shaped cross-section is welded on the top of the linear slide rail 42 in the middle position, and the inside is buckled with the "I"-shaped protrusions on the lower sides of the two clamping arms 31 in the middle, which can limit the lateral displacement between the pressure clamping mechanism 3 and the support frame 4. The lower part of the linear slide rail 42 is welded to the transverse connecting bar 43 and the cylindrical support column 44. The transverse connecting bar 43 connects the three linear slide rails 42 to limit the lateral deformation of the pressure clamping mechanism 3 and the linear slide rail 42. The cylindrical support column 44 is welded to the lower sides of the linear slide rails 42 on both sides to provide vertical support for the segment gradient pressure device 3.

[0090] A certain number of rollers 41 are placed in the space between the groove on the top of the linear slide rail 42 and the wide groove on the lower side of the clamping arm 31. The rollers 41 can reduce the frictional resistance when the double-bent clamping arms on both sides approach, and provide vertical support for the pressure clamping mechanism 3.

[0091] The test sample consists of two seal strips 51 to be detected and two cement blocks 52. The seal strip 51 is selected according to scientific research and engineering requirements. A groove adapted to the contour of the seal strip 51 is provided on the side of the cement block 52, which is convenient for the combination of the seal strip and the cement block and simulates the needs of actual engineering.

[0092] The specific test method of the present invention is as follows:

[0093] Step 1: Determine the sealing strip 51 and cement block 52 based on research needs or actual engineering conditions. Place the sealing strip 51 in the corresponding grooves of the two cement blocks 52, and connect the sealing strip 51 to the cement blocks 52 by grouting, adhesive, or other means. Adhere a certain number of thin-film vibration acceleration sensors to the contact surfaces of the sealing strip 51 and cement blocks 52, and a certain number of thin-film stress sensors to the contact points of the sealing strips. The number and spacing of the sensors are selected based on the size of the sealing strip.

[0094] Step 2: Make the surfaces of the two sealing strips 51 fit tightly together, and place the cement block 52 on the clamping arm 31 as a whole. Adjust the height of the hammer vibration mechanism 2, rotate the turntable 32 outside the screw so that the clamping arm 31 clamps the cement block, observe the stress sensor reading, make the stress sensor reading equal to or close to 0, and record the distance between the two cement blocks 52 at this time.

[0095] Step 3: Rotate the outer turntable 32 of the screw to continue applying pressure to the cement block 52 with the clamping arm 31. Observe the distance sensor data between the two cement blocks 52 at any time. Stop rotating the turntable 32 after each rotation and record the distance between the cement blocks 52 and the stress sensor reading at this time. Apply reciprocating driving force and release the vibrating hammer 14. Use the hammering part 1 to hammer the cement block 52 at a certain frequency according to scientific research or engineering needs. Observe and record the readings on the thin film vibration acceleration sensors on both sides.

[0096] Step 4: Repeat the steps in Step 3 until the two cement blocks 52 are joined together or the sealing strip 51 is completely destroyed, thus completing the on-site test.

[0097] Step 5: Based on the previously recorded data, the relationship between the distance change and the stress-strain recorded by the stress sensor, as well as the relationship between the vibration acceleration attenuation amplitude and the distance change, can be obtained. In the numerical calculation software, cement blocks and sealing strips with the same size and other physical parameters are set up. The spacing between the cement blocks is changed to ensure that the stress-strain is close to the actual test results. Then, the same vibration source is applied in the numerical calculation software, and the contact damping coefficient of the sealing strip is continuously adjusted so that the vibration acceleration change amplitude before and after the numerical calculation is the same as the actual test results, ultimately obtaining the contact damping coefficient.

[0098] The vibratory hammer 14 can be replaced with hammers of different weights to achieve different hammering effects and produce different vibration impacts.

[0099] In the third step, the hammering frequency can be set according to the working conditions.

[0100] In addition to the contact between sealing strips, this device can obviously also test and establish constitutive models of other contacts with similar structures.

[0101] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A constitutive testing device for the sealing strip contact of a shield tunnel segment, characterized in that, include: The support frame is located at the very bottom of the entire device; A pressure clamping mechanism is provided on the upper part of the support frame; Two cement blocks are arranged side by side on the pressure clamping mechanism, namely the first cement block and the second cement block, and two sealing strips are provided on the adjacent side walls of the two cement blocks. The pressure clamping mechanism is used to provide pre-tightening force to the sealing strip; A hammering vibration mechanism is used to apply a top-down hammering vibration to the two cement blocks; A thin-film vibration acceleration sensor is disposed between the cement block and the sealing strip; A thin-film stress sensor is disposed on the contact surface between the two sealing strips.

2. The shield tunnel segment sealing strip contact constitutive testing device according to claim 1, characterized in that, The pressure clamping mechanism includes: A linear slide rail is fixedly connected to the top of the support frame; Two clamping arms are slidably mounted on the linear slide rail, and the two clamping arms can move towards each other on the linear slide rail; The distance adjustment mechanism is used to adjust the clamping distance between the two clamping arms; The two cement blocks are sandwiched between two clamping arms.

3. The shield tunnel segment sealing strip contact constitutive testing device according to claim 2, characterized in that, Three linear slide rails are arranged sequentially along the length of the cement. Each linear slide rail is equipped with two clamping arms. The middle linear slide rail is the first linear slide rail, and the clamping arm on the first linear slide rail is the first clamping arm. The linear slide rails on both sides are the second linear slide rails, and the clamping arms on the second linear slide rails are the second clamping arms. The distance adjustment mechanism is set on the first clamping arm. The second clamping arm and the first clamping arm move synchronously through a connecting member.

4. The shield tunnel segment sealing strip contact constitutive testing device according to claim 3, characterized in that, The distance adjustment mechanism includes: The screw is threadedly connected to the threaded holes provided at the bottom of the two first clamping arms, and the internal threads in the threaded holes of the two first clamping arms are in opposite directions; A turntable, located on one side of the first clamping arm, is fixedly connected to one end of the screw and is used to rotate the screw.

5. The shield tunnel segment sealing strip contact constitutive testing device according to claim 3, characterized in that, The bottom of the second clamping arm is provided with a groove, and the top of the second linear slide rail is fixedly provided with a roller to reduce the friction when the clamping arm approaches. The groove of the second clamping arm and the roller provided on the top of the second linear slide rail are in clearance fit.

6. The shield tunnel segment sealing strip contact constitutive testing device according to claim 1, characterized in that, The hammer vibration mechanism includes: The base has a fixed post on its upper side; A cantilever beam has a cantilever horizontally positioned at the top, with a transverse sliding groove on the cantilever. One end of the cantilever is fixedly connected to a vertically positioned limiting sleeve. The bottom of the limiting sleeve is open, and the bottom opening matches the outer diameter of a fixing column. Limiting holes are equidistantly positioned on the side of the limiting sleeve along the height direction. The fixing column is inserted into the limiting sleeve to fix the cantilever beam to the fixing column, and the height of the cantilever beam is adjusted by bolts and limiting holes. A support platform is disposed on one side of the base and located below the support frame; A hammering component, slidably connected to a groove in the cantilever beam, is used to hammer the two cement blocks, and includes: a fixing frame slidably disposed on the cantilever beam; The drive wheel is located on the upper side of the fixed frame and is connected to the outdoor unit drive. The driven wheel is located on the lower side of the fixed frame and is connected to the driving wheel via a conveyor belt. A steel cable is wound around the driven wheel. The hammer holder is fixedly connected at its upper end to the free end of the steel cable, and a vibrating hammer is fixedly installed at its lower end.

7. The shield tunnel segment sealing strip contact constitutive testing device according to claim 6, characterized in that, The upper part of the vibrating hammer is a cylindrical iron block, and the lower part is a hemispherical protrusion, which is an elastic rubber hemisphere.

8. The shield tunnel segment sealing strip contact constitutive testing device according to claim 3, characterized in that, The support frame includes: A cylindrical support column is disposed below the second linear slide rail to support the pressure clamping mechanism; A transverse connecting strip is provided between the linear slide rail and the cylindrical support column; The first linear slide rail is fixedly installed in the middle of the transverse connecting bar, and the second linear slide rail is welded to the cylindrical support column and the transverse connecting bar.

9. A test method based on the shield tunnel segment sealing strip contact constitutive test device according to any one of claims 1 to 8, characterized in that, Includes the following steps: Step 1: Confirm the size of the cement block, place two sealing strips on the two cement blocks respectively, and connect the cement blocks and sealing strips by grouting and adhesive. Set the thin film vibration acceleration sensor on the contact surface between the sealing strip and the cement block, and set the thin film stress sensor on the contact surface between the two sealing strips. Step 2: After moving the cement block to make the two sealing strips stick together, place the cement block as a whole on the pressure clamping mechanism, clamp the cement block by the pressure clamping mechanism and apply pressure to the two cement blocks, and observe the reading of the stress sensor. When the stress sensor reading is equal to 0 or close to 0, record the distance between the two cement blocks. Step 3: Continue to apply pressure to the two cement blocks through the pressure clamping mechanism, and stop the work of the distance adjustment mechanism at intervals. Record the distance between the cement blocks and the stress sensor reading at this time. At the same time, start the vibratory hammer mechanism, input the reciprocating driving force, and repeatedly hammer the cement blocks. Record the data of the vibration acceleration sensor. Step 4: Repeat step 3 until the two cement blocks are in contact or the sealing strip is completely destroyed to complete the test; Step 5: Based on the recorded data, obtain the relationship between the distance change and the stress magnitude recorded by the stress sensor, as well as the relationship between the vibration acceleration attenuation amplitude and the distance change; The contact damping coefficient was obtained at the terminal through experimental data.

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