Experimental device and method for research on deformation correction of circular shield tunnel lining structure

Abstract

The present invention provides a circular shield tunnel lining structure deformation correction research test device and test method, the test device includes a reaction frame, a load application assembly, a formation spring unit, a structural deformation correction assembly and a deformation measurement mechanism, the assembled circular test segment is located in the reaction frame, the formation spring unit is arranged between the outer wall of the test segment and the inner wall of the reaction frame; the structural deformation correction assembly is located inside the test segment and contacts the inner wall of the test segment, the test segment is provided with a measurement mechanism; the inner wall of the reaction frame contacts the outer wall of the test segment through the load application assembly; the deformation measurement mechanism includes a global measurement camera, and the global measurement camera is located on one side of the test segment. By adopting the technical solution of the present invention, ballast simulation can be performed, and deformation correction of the test segment can be performed while maintaining ballast.

Description

Technical Field

[0001] The invention belongs to the technical field of shield tunnels, and in particular relates to a circular shield tunnel lining structure deformation correction research test device and a test method. Background Art

[0002] In recent years, shield tunneling has been widely used in the construction of urban subway tunnels, underwater tunnels and highway tunnels due to its high cost-effectiveness and low disturbance to the surrounding soil. In the long-term operation, due to the influence of the construction of adjacent projects, the problem of overloading on the upper part of the shield tunnel often occurs, resulting in excessive deformation of the tunnel structure. Therefore, it is very important to study the deformation correction of the shield tunnel segment structure, and it is necessary to propose a test device for the deformation correction of the shield tunnel structure.

[0003] In the existing shield segment test device and method, jacks and springs are mainly used to simulate the load conditions and the resistance of the stratum soil, and the main focus is on studying the stress and deformation characteristics of the shield segment under different load conditions. At present, a test device and method specifically used for studying the deformation correction of the shield segment has not been proposed in detail. Summary of the invention

[0004] In view of the above technical problems, the present invention discloses a circular shield tunnel lining structure deformation correction research test device and test method, which can perform ballasting simulation and can correct the deformation of the deformed shield tunnel structure while maintaining the test load on the test segment.

[0005] To this end, the technical solution adopted by the present invention is:

[0006] A circular shield tunnel lining structure deformation correction research and test device, comprising a reaction frame, a load application assembly, a formation spring unit, a structural deformation correction assembly and a deformation measurement mechanism, wherein an assembled cylindrical test segment is located in the reaction frame, and the formation spring unit is arranged between the outer wall of the test segment and the inner wall of the reaction frame; the structural deformation correction assembly is located inside the cylindrical test segment and contacts the inner wall of the test segment, and a measurement mechanism is arranged on the test segment; the top inner wall of the reaction frame contacts the outer wall of the test segment through the load application assembly and is connected to the top;

[0007] The deformation measurement mechanism includes a global measurement camera, and the global measurement camera is located on one side of the test segment;

[0008] The global measurement camera, load application component, structural deformation correction component, and measurement mechanism are electrically connected to the control terminal. With this technical solution, the load is applied by the load application component to obtain the bearing capacity of the test segment, wherein the formation spring module can simulate the formation boundary conditions of the test segment, and different formation resistances can be simulated by changing the stiffness of the spring. In addition, correction can be performed by the structural deformation correction component to achieve deformation correction of the deformed shield tunnel structure while maintaining the load applied to the test segment test, and the device and method are simple and easy to implement.

[0009] As a further improvement of the present invention, the measuring mechanism includes a strain gauge, a displacement meter, and a crack meter.

[0010] As a further improvement of the present invention, the load application assembly includes a servo hydraulic jack and a combined loading beam, one end of the servo hydraulic jack is connected to the reaction frame, and the other end contacts the outer wall of the test segment through the combined loading beam.

[0011] As a further improvement of the present invention, the combined loading beam comprises a loading pad and a curved loading beam, the other end of the servo hydraulic jack is connected to the loading pad, the loading pad is connected to the curved loading beam through an elastic member, and the curved loading beam acts on the surface of the test segment. Further preferably, the curvature of the curved loading beam is the same as that of the test segment.

[0012] As a further improvement of the present invention, the arc-shaped loading beam acts on the surface of the test segment through a rubber pad.

[0013] As a further improvement of the present invention, the rounded angle of the arc-shaped loading beam is 90°.

[0014] As a further improvement of the present invention, the elastic component is a spring.

[0015] As a further improvement of the present invention, a plurality of formation spring units are arranged on the periphery of the test segment, the directions of the formation spring units all point to the center of the circle, and the arrangement range is the surface of the test segment excluding the range covered by the arc loading beam.

[0016] As a further improvement of the present invention, the formation spring unit includes a support, a spring and a housing.

[0017] As a further improvement of the present invention, the structural deformation correction assembly includes a rotatable reaction support, a jack and an arc-shaped lifting support, the reaction support is connected to the arc-shaped lifting support through the jack, and the arc-shaped lifting support is in contact with the inner wall of the test pipe segment assembled into a cylindrical shape. Further, the structural deformation correction assembly includes a motor connected to a terminal, the motor is connected to the rotating shaft, and the motor is controlled by the terminal to drive the reaction support to rotate.

[0018] Further preferably, the rotatable reaction force support comprises a rotation axis and a rotation reaction force support, and the rotation axis and the rotation reaction force support are connected.

[0019] As a further improvement of the present invention, the reaction frame includes an external reaction support and an arc-shaped internal reaction wall, the internal reaction wall is located inside the external reaction support, and the internal reaction wall is provided with an opening, and the opening is used to set the load application component.

[0020] The present invention also discloses a circular shield tunnel lining structure deformation correction research test method, which uses the circular shield tunnel lining structure deformation correction research test device as described above to conduct a test, and a global measurement camera globally measures the deformation of the test segment and feeds back to the control terminal;

[0021] The control terminal controls the force applied by the servo hydraulic jack to simulate the specified ground loading condition, and after the load application is stable, locks the range of the servo hydraulic jack and maintains the operation of the servo hydraulic system;

[0022] According to the deformation of the test segment, the force and jacking angle applied by the structural deformation correction component are adjusted by the control terminal to correct the deformation of the test segment. After completing a jacking correction, the deformation of the test segment is re-determined; this operation step is repeated to repeatedly correct the deformation of the test segment until the expected correction effect is achieved, completing the deformation correction of the circular shield tunnel structure.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] By adopting the technical solution of the present invention, the test segment can be subjected to pressure simulation through the load applying component, the formation spring module can simulate the formation boundary conditions of the test segment, and different formation resistances can be simulated by changing the stiffness of the spring; the deformation of the test segment can be corrected through the structural deformation correction component under the condition that the load applying component maintains the pressure, the structural deformation correction component can adjust the jacking angle by rotating the reaction force support, and adjust the jacking force by the jack, the device is simple, and the method is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of a circular shield tunnel lining structure deformation correction research and test device according to an embodiment of the present invention.

[0026] Figure 2 It is a schematic structural diagram of a formation spring unit according to an embodiment of the present invention.

[0027] Figure 3 Schematic diagram of a combined loading beam according to an embodiment of the present invention; (a) is a front view, and (b) is a side view.

[0028] Figure 4 Schematic diagram of the structure of a structural deformation correction component according to an embodiment of the present invention; (a) is a front view, and (b) is a side view.

[0029] Figure 5 4 is a structural view of a deformation measuring mechanism according to an embodiment of the present invention.

[0030] The reference numerals include:

[0031] 1-internal reaction wall; 2-external reaction support; 3-test segment; 4-stratum spring unit; 5-combined loading beam; 6-servo hydraulic jack; 7-structural deformation correction assembly; 8-stratum spring unit support; 9-stratum spring; 10-stratum spring unit housing; 11-loading pad; 12-spring; 13-concave arc loading beam; 14-first flexible rubber pad; 15-rotation axis; 16-rotation reaction support; 17-jack; 18-arc jacking support; 19-second flexible rubber pad; 20-global measurement camera; 21-rotating ball; 22-hanger. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described in further detail below.

[0033] like Figure 1~Figure 5 As shown, a circular shield tunnel lining structure deformation correction research and test device comprises a reaction frame, a load applying assembly, a formation spring unit 4 and a structural deformation correction assembly 7, wherein the assembled circular test segment 3 is located in the reaction frame, and the formation spring unit 4 is arranged between the outer wall of the test segment 3 and the inner wall of the reaction frame; the structural deformation correction assembly 7 is located inside the test segment 3 and contacts with the inner wall of the test segment 3, and the test segment 3 is provided with measuring mechanisms such as strain gauges, displacement meters, and joint gauges; the inner wall of one side of the reaction frame contacts with the outer wall of the test segment 3 through the load applying assembly; the deformation measuring mechanism comprises a global measurement camera 20, a hanger 22, and a rotating ball 21, and the hanger 22 is connected to the global measurement camera 20 through the rotating ball 21, and the global measurement camera 20 is located on one side of the test segment 3 for globally monitoring the deformation of the test segment 3.

[0034] Specifically, a plurality of formation spring units 4 are arranged on the periphery of the test segment 3, and the directions of the formation spring units 4 all point to the center of the circle, and the arrangement range is the surface of the test segment 3 excluding the range covered by the arc-shaped loading beam. Figure 2 As shown, the formation spring unit 4 comprises a formation spring unit support 8, a formation spring and a formation spring unit housing 10. Different formation resistance effects can be simulated by changing the stiffness of the spring.

[0035] The load application assembly includes a servo hydraulic jack 6 and a combined loading beam 5. One end of the servo hydraulic jack 6 is connected to the reaction frame, and the other end is in contact with the outer wall of the test segment 3 through the combined loading beam 5. Figure 3 As shown, the combined loading beam 5 includes a loading pad 11 and a concave arc loading beam 13. The other end of the servo hydraulic jack 6 is connected to the loading pad 11. The loading pad 11 is connected to the concave arc loading beam 13 through a spring 12. The concave arc loading beam 13 acts on the surface of the test segment 3 through a first flexible rubber pad 14. Further preferably, the curvature of the concave arc loading beam 13 is the same as that of the test segment 3. The round angle of the concave arc loading beam 13 is 90°. The combined loading beam 5 can convert the concentrated load of the servo hydraulic jack 6 into a uniformly distributed load acting on the surface of the test segment 3. The spring 12 between the loading pad 11 and the concave arc loading beam 13 can load the test segment 3 in the direction of lifting and correction while maintaining the load applied by the servo hydraulic jack 6.

[0036] like Figure 4 As shown, the structural deformation correction component 7 includes a rotatable reaction force support, a jack 17 and an arc-shaped lifting support 18. The reaction force support is connected to the arc-shaped lifting support 18 through the jack 17. The arc-shaped lifting support 18 is convex and contacts the inner wall of the test segment 3 assembled into a cylindrical shape. The rotatable reaction force support includes a rotating axis 15 and a rotating reaction force support 16 connected thereto. The structural deformation correction component 7 can adjust the lifting position through the rotating reaction force support. A second flexible rubber pad 19 is installed at one end of the arc-shaped lifting support 18, which can evenly distribute the lifting load on the surface of the test segment 3.

[0037] Furthermore, the reaction frame includes an outer reaction support 2 and an arc-shaped inner reaction wall 1, wherein the inner reaction wall 1 is located inside the outer reaction support 2, and the inner reaction wall 1 is provided with an opening, and the opening is used to set a load application component;

[0038] The global measurement camera 20, the servo hydraulic jack 6, the jack 17, the strain gauge, the displacement meter, the seam meter and other measuring mechanisms are electrically connected to the control terminal.

[0039] The present invention also discloses a circular shield tunnel lining structure deformation correction research test method, which uses the circular shield tunnel lining structure deformation correction research test device as described above to conduct a test, and a global measurement camera globally measures the deformation of the test segment and feeds back to the control terminal;

[0040] The control terminal controls the force applied by the servo hydraulic jack to simulate the specified ground loading condition, and after the load application is stable, locks the range of the servo hydraulic jack and maintains the operation of the servo hydraulic system;

[0041] According to the deformation of the test segment, the force and jacking angle applied by the structural deformation correction component are adjusted by the control terminal to correct the deformation of the test segment. After completing a jacking correction, the deformation of the test segment is re-determined; this operation step is repeated to repeatedly correct the deformation of the test segment until the expected correction effect is achieved, completing the deformation correction of the circular shield tunnel structure.

[0042] According to the deformation of the test segment, the force and jacking angle applied by the structural deformation correction component are adjusted by the control terminal to correct the deformation of the test segment. After completing a jacking correction, the deformation of the test segment is re-determined; this operation step is repeated to repeatedly correct the deformation of the test segment until the expected correction effect is achieved, completing the deformation correction of the circular shield tunnel structure.

[0043] The specific installation steps are as follows:

[0044] S1. Assemble the circular test segments;

[0045] S2. Install the reaction frame;

[0046] S3. Arrange strain gauges, displacement meters, seam gauges and other measuring devices on the test pipe segment and connect them to the intelligent terminal control system;

[0047] S4. Install the formation spring unit at the point determined by the reaction frame to complete the installation of the formation spring module;

[0048] S5. Install the load applying device. First, install the servo hydraulic jack at the determined point of the reaction frame, install the loading pad at the other end of the jack, then install the arc loading beam, and finally install the spring between the loading plate and the arc loading beam, and then connect the servo hydraulic jack to the control terminal;

[0049] S6. Install the deformation measurement mechanism, install the hanger, rotating ball and global measurement camera in sequence, and connect the control terminal to ensure that the global measurement camera can globally measure the test segment, and connect the control terminal;

[0050] S7. Control the force applied by the servo hydraulic jack through the control terminal to simulate the specified ground loading condition. After the load is applied stably, lock the range of the servo hydraulic jack and maintain the operation of the servo hydraulic system.

[0051] S8. Install the tunnel structure deformation correction component, first install the rotating shaft and the rotatable reaction support, then install the jack, and finally install the arc loading beam; further, the structural deformation correction component includes a motor connected to the terminal, the motor is connected to the rotating shaft, and the terminal controls the motor to drive the reaction support to rotate.

[0052] S9. Before performing jacking to correct the deformation of the tunnel structure, the final deformation of the test segment is determined by using a global measurement camera, and the deformation of the test segment is saved and monitored in real time;

[0053] S10, according to the deformation of the test segment, the force applied by the jack and the jacking angle of the arc-shaped jacking support are adjusted by the control terminal to correct the deformation of the test segment. After completing one jacking correction, the deformation of the test segment is re-determined;

[0054] S11, loop the operating steps of S10, repeatedly perform deformation correction of the test segments until the expected correction effect is achieved, and complete the deformation correction of the circular shield tunnel structure.

[0055] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A circular shield tunnel lining structure deformation correction research test device, characterized by: It includes a reaction frame, a load application assembly, a formation spring unit, a structural deformation correction assembly and a deformation measurement mechanism. The assembled circular test segment is located in the reaction frame, and the formation spring unit is arranged between the outer wall of the test segment and the inner wall of the reaction frame; the structural deformation correction assembly is located inside the test segment and contacts the inner wall of the test segment, and a measurement mechanism is arranged on the test segment; the inner wall of the reaction frame contacts the outer wall of the test segment through the load application assembly; The deformation measurement mechanism includes a global measurement camera, and the global measurement camera is located on one side of the test segment; The global measurement camera, the load application component, the structural deformation correction component, the measurement mechanism and the control terminal are electrically connected; The load applying assembly includes a servo hydraulic jack and a combined loading beam, one end of the servo hydraulic jack is connected to the reaction frame, and the other end is in contact with the outer wall of the test segment through the combined loading beam; A plurality of formation spring units are arranged on the periphery of the test segment, the directions of the formation spring units all point to the center of the circle, and the arrangement range is the surface of the test segment excluding the range covered by the arc-shaped loading beam; The structural deformation correction assembly includes a rotatable reaction force support, a jack and an arc-shaped jacking support. The reaction force support is connected to the arc-shaped jacking support through the jack, and the arc-shaped jacking support is in contact with the inner wall of the assembled circular test pipe segment.

2. The circular shield tunnel lining structure deformation correction research and test device according to claim 1 is characterized by: The measuring mechanism comprises a strain gauge, a displacement meter and a crack meter.

3. The circular shield tunnel lining structure deformation correction research and test device according to claim 2 is characterized by: The combined loading beam comprises a loading pad and an arc-shaped loading beam, the other end of the servo hydraulic jack is connected to the loading pad, the loading pad is connected to the arc-shaped loading beam through an elastic component, and the arc-shaped loading beam acts on the surface of the test segment.

4. The circular shield tunnel lining structure deformation correction research and test device according to claim 3 is characterized by: The arc-shaped loading beam acts on the surface of the test segment through a rubber pad.

5. The circular shield tunnel lining structure deformation correction research and test device according to claim 3 is characterized by: The rounded angle of the arc-shaped loading beam is 90°.

6. The circular shield tunnel lining structure deformation correction research and test device according to claim 1 is characterized by: The reaction frame comprises an outer reaction support and an arc-shaped inner reaction wall, wherein the inner reaction wall is located inside the outer reaction support and is provided with an opening for arranging a load applying component.

7. A test method for the correction of deformation of circular shield tunnel lining structure, characterized by: The test is conducted by using the circular shield tunnel lining structure deformation correction research test device as described in any one of claims 1 to 6, which includes the following steps: The global measurement camera globally measures the deformation of the test segment and feeds back to the control terminal; The control terminal controls the force applied by the servo hydraulic jack to simulate the specified ground loading condition, and after the load application is stable, locks the range of the servo hydraulic jack and maintains the operation of the servo hydraulic system; The control terminal adjusts the force and jacking angle applied by the structural deformation correction component to correct the deformation of the test segment according to the deformation of the test segment. After completing a jacking correction, the deformation of the test segment is re-determined; this operation step is repeated to repeatedly correct the deformation of the test segment until the expected correction effect is achieved, completing the deformation correction of the circular shield tunnel structure.

Images