Segment floating test device with stable and accurate process

Abstract

The present invention relates to the field of shield construction experimental equipment, and in particular to a segment floating test device with a stable and accurate process. It aims to solve the problem in the prior art that factors other than slurry and segment have too much influence on the test results during the segment floating test. The present invention includes a bottom slide and a mud box installed on the bottom slide. A shield entry and exit device and a data measuring device are installed on one side of the mud box, and a segment disassembly and assembly device is installed on the other side. A shield auxiliary support device is also provided on the segment disassembly and assembly device. A segment auxiliary positioning device is also provided on the outer side of the shield entry and exit device. The segment auxiliary positioning device is installed in conjunction with the data measuring device at the same time. The advantage is that: by using bidirectionally installed equipment to complement and assist each other, a set of equipment for simulating and measuring segment floating experiments is realized, the measurement types are diverse, the measurement accuracy is high, and the measurement cost can be greatly saved.

Description

Technical Field

[0001] The present invention relates to the field of a pipe segment floating test device with stable and accurate process, in particular to a pipe segment floating test device with stable and accurate process. Background Art

[0002] With the continuous improvement of tunneling technology, the requirements for tunnel projects are becoming increasingly stringent, and shield technology is also developing towards higher levels. When large-diameter shield machines are excavated in water-rich strata, the excavation gaps are filled with synchronous grouting material. The synchronous mortar takes a long time to set, and the tunnel segment structure is significantly affected by buoyancy. If anti-buoyancy measures are not in place, the segments will float up, misaligned, and experience joint leakage after they are released from the shield tail. Ensuring the buoyancy of large-diameter segment structures under high water pressure is a key control factor for engineering construction quality. Research is being conducted on the relationship between the setting time of synchronous grouting slurry and the buoyancy deformation of shield segments. The influence of slurry density at different setting times on tunnel buoyancy is explored. Combined with an analysis of factors affecting tunnel buoyancy, a tunnel buoyancy safety evaluation model is ultimately established, and anti-buoyancy measures are proposed for different tunnel stages. This is one of the key issues that need to be addressed in controlling the buoyancy of segment structures in ultra-large-diameter shield tunnels.

[0003] The floating mechanism of shield tunnel segments was studied. Combined with engineering practice, a similar model test of segment lining structure with consistent apparent specific gravity was proposed. At the same time, by simulating the joints between segment rings, the longitudinal floating form of shield tunnel segments and segment misalignment can be simulated, revealing the floating characteristics of segments under the action of groundwater and synchronous grouting slurry and their temporal and spatial distribution. At the current stage of technology, there are many studies on this type of floating measurement scheme. For example, the patent with application number 202210085473.0 mentions that the segment lining structure model includes multiple segment rings, which have a certain geometric similarity ratio with the prototype segment rings, and have the same apparent specific gravity as the prototype segment rings, thereby more realistically reflecting the floating characteristics of the actual segment structure and ensuring the reliability of the test.

[0004] For example, the patent with application number 202210085443.X discloses a floating experimental measurement system, including simulated segments and shields, and uses a measuring device to simulate the process of the segment coming out of the shield tail and coming into contact with the synchronous grouting slurry, and more accurately reflects the changes in the floating posture of the segment lining assembly under the wrapping of the synchronous grouting slurry.

[0005] For example, the patent with application number 202111422646.5 adopts a multi-body design method to quickly adjust the gravity of the device, meet the needs of different suppression forces and realize the suppression adjustment of the buoyancy of the pipe segments; the present invention can move synchronously with the trolley, and can adjust its own motion state to quickly suppress the buoyancy generated by the exposed pipe segments; the present invention can indirectly adjust the "head-diving" problem of the shield, realize auxiliary adjustment of the shield posture, and improve on-site operation efficiency.

[0006] However, the existing technology still has the following shortcomings. Specifically, the staff believe that: 1. During the shield removal process, instability often interferes with the pipe segment, affecting the measurement results; 2. At this stage, the measurement method is single and the cost of related experimental equipment is too high; 3. The freedom of the parts inside the overall design interferes with each other, making it difficult to form a measurement test bench as a whole. Summary of the Invention

[0007] The purpose of the present invention is to solve the problem in the prior art that factors other than slurry and tube segments have too great an impact on the test results during the tube segment floatation test.

[0008] The specific scheme of the present invention is:

[0009] A pipe segment floating test device with stable and accurate process is designed, including a bottom slide and a mud box installed on the bottom slide, a shield entry and exit device and a data measuring device are installed on one side of the mud box, and a pipe segment disassembly and assembly device is installed on the other side, a shield segment disassembly and assembly device is also provided on the pipe segment disassembly and assembly device, and a pipe segment auxiliary support device is also provided on the outer side of the shield segment entry and exit device, and the pipe segment auxiliary positioning device is installed in linkage with the data measuring device at the same time; the shield segment entry and exit device includes a shield segment assembly driven by a hydraulic rod of a hydraulic pulling and pressing mechanism, and also includes a constraint plate fixed on one side of the shield segment assembly, the upper part of the constraint plate is connected to the shield segment assembly, and the lower part of the constraint plate is slidably installed on the bottom slide, and a support guide column and a support guide column guide support are provided on the other side of the shield segment assembly, and the mud box A shield plate limit position slot is provided, and a support component for supporting a guide column guide support is provided at a position adjacent to the pipe segment auxiliary positioning device, and an outlet hole is provided on the corresponding mud box which also serves as a support guide column guide support; the pipe segment auxiliary positioning device includes a rod-shaped cantilever tube (4), on which a bracket is installed at the far bottom slide end, and a driving motor for driving the cantilever tube to rotate is installed on the bracket, and a lead screw is connected to the cantilever tube via an internal thread to drive the baffle assembly to move, and the data measuring device is clamped on the baffle assembly, and the pipe segment auxiliary positioning device also includes a locking ring movably installed on the pipe segment installation side; the pipe segment auxiliary positioning device also includes a pipe segment pre-installation frame, which is located between the mud box and the pipe segment jacking hydraulic cylinder to form a circle-by-circle installation of the simulated pipe segment.

[0010] In a specific implementation, a columnar transparent observation tube is installed in the mud box, coaxially corresponding to the shield installation position.

[0011] In a specific implementation, an auxiliary support roller of a shield auxiliary device is provided at the bottom of the mud box. The shield shell is a double-layer structure with 8 grouting pipes embedded in it. The grouting pipelines are externally connected to a pressure regulating valve and a flow regulating valve.

[0012] In specific implementations, the segments are fixed between adjacent simulated segments via T-shaped sealing rings and curved baffles. The cross-section is T-shaped, and a positioning curved plate is provided on the inner sidewall of the simulated segment. The horizontal side of the T is connected to the curved plate by screws. The top of the vertical side of the T is a curved protrusion, or a plurality of crown-shaped protrusions are evenly distributed in an array on the top surface. The outer side of the simulated segment is provided with a curved external segment rubber sealing strip, which forms a sealing ring after the segment is installed. The external segment rubber sealing strip is installed in a sealing groove on the simulated segment. The sealing groove is located at 1 / 4-1 / 5 of the horizontal position of the segment, near the end of the shield tail.

[0013] The present invention also relates to a testing method for a segment floating test device with stable and accurate process, comprising the following steps:

[0014] (1) Assemble the shield inlet and outlet device, the pipe segment disassembly device and the mud box: on the bottom slide, install the pipe segment disassembly device, the mud box and the shield inlet and outlet device in sequence from one end to the other end. The end of the pipe segment disassembly device is located at the pipe segment inlet and outlet of the mud box. A slot for limiting the limit position of the shield is provided in the mud box. The length of the mud box is not less than the length of the shield pipe formed by the shield. At least two support rollers are provided below the working area of ​​the shield pipe. The horizontal degree of freedom between the shield inlet and outlet device and the mud box is limited by hydraulic rods on both sides, and the rotational degree of freedom is limited by the support below. Then, a replacement gasket is installed at the tail of the shield inlet and outlet device, and a support guide column is installed on the replacement gasket through the mud box. The corresponding support guide column cooperates with the support roller below the shield pipe before disassembly;

[0015] (2) Assembling the data measuring device: the hydraulic rod drives the lower shield in-and-out device to move to the limit position of the shield outside the mud box (1), and the pipe segment auxiliary positioning device is installed in the shield pipe with the same center of gravity axis, and then the data measuring device is clamped in the baffle assembly of the pipe segment auxiliary positioning device;

[0016] (3) Assembling the segments to form a simulated tunnel pipe: remove the rear plate of the mud box and the support guide column on the shield tube. The segment support point is outside the mud box and tangent to the outer contour of the segment. The segment disassembly and assembly device is equipped with a segment push-pull hydraulic cylinder until the segments are assembled circle by circle for 20 circles to form a simulated segment circle group. At the same time, the last segment protrudes more than 40 cm from the mud box. Then, remove the replacement gasket on the last formed circle of the tube and install the shield tail brush to form the shaft sleeve fit of the shield shell and the tube shell in this step. Then, install the shield tail brush pressure block and the support guide column fixing block on the shield tail brush;

[0017] (4) Positioning of the simulated segment ring: The shield entry and exit device drives the shield and the simulated segment ring group in step (3) to move to the tail end of the simulated segment ring group, which is close to the end of the measuring device. After that, the rear plate of the mud box is installed, and the support guide column is installed twice through the rear plate. After that, grouting is started through the grouting pipe pre-installed in the segment, and the mud box cover is covered;

[0018] (5) Start measuring and record data: The shield inlet and outlet device drives the shield out of the mud box, and the measuring device measures the floating condition of each segment ring and records the results, which are transmitted to the server via the information transmission line.

[0019] In step (4), it also includes the first end being fixed and the first end being not fixed. The first end being fixed includes stopping when the end face of the connecting frame at the fixed end of the pipe segment coincides with the outer end face of the mud box, fixing it with the mud box, adjusting the position of the pipe segment retaining frame so that it is close to the end face of the first ring pipe segment and abutting against the baffle of the pipe segment auxiliary positioning device, and installing a locking ring at the other end of the simulated pipe segment ring group. The first end being not fixed includes stopping when the end face of the pipe segment is 30-35mm away from the inner end face of the mud box, adjusting the position of the pipe segment retaining frame so that it is close to the end face of the first ring pipe segment and abutting against the baffle of the pipe segment auxiliary positioning device.

[0020] Before step (3), a transparent cover installation step is added: the shield plate entry and exit device is moved and assembled, and a transparent box pad and a transparent cover are installed in the mud box, wherein the transparent cover is coaxial with the shield shell ring formed by the shield shell.

[0021] The mud box is installed when the grouting is replaced by filling. Auxiliary rollers are installed at the bottom of the pipe segments in the mud box. At the same time, the supporting guide columns are removed and the reserved guide column holes are sealed with bumps.

[0022] Step (3) is replaced by a whole ring of scaled segments assembled on the ground, which are then hoisted and placed on the segment bracket, and then the whole ring is pushed into the shield using a propulsion hydraulic cylinder.

[0023] The beneficial effects of the present invention are:

[0024] The system can be used to test the flotation of segments in a grouting environment and simulate the soil-box rock formation environment to test the mechanical performance of the segments. The T-shaped seal is suitable for initial application in simulation experiments. Although the resulting shape differs from the simulated shape inside the segment, the test process is stable and the sealing performance is good.

[0025] The scaled-down pipe segment with T-type sealing gasket structure has an appearance different from the actual pipe segment, but it can meet the controllable shear stiffness between pipe segment rings, the requirements of repeated tests, and the sealing performance requirements.

[0026] The rubber seals on the outer segments are easy to operate and meet the sealing requirements, namely preventing slurry from entering the gap at the shield tail. The entire equipment design is highly standardized, allowing for maximum disassembly and adjustment, and is suitable for a variety of workstation sizes.

[0027] Each ring of scaled segments is fitted with a rubber seal, while the inner wall of the shield is smooth. As each ring of segments emerges from the shield, the seals of the next ring remain sealed, preventing slurry from flowing back into the gap at the end of the shield.

[0028] Advantages: 1) As the segments are removed from the shield one by one, the sealing gaskets on the outside of each ring of segments continue to work;

[0029] 2) In small gaps, the annular gasket is easy to operate and has a good sealing effect.

[0030] To achieve simultaneous grouting, the shield is designed as a double-layer structure with an inner diameter of 750mm, housing eight grouting pipes. These pipes can independently control grouting pressure and flow. Furthermore, the double-layer shield allows for easy disassembly and cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a perspective view of the structure of the present invention;

[0032] Figure 2 It is a front view of the structure of the present invention;

[0033] Figure 3 It is a right side view of the structure of the present invention;

[0034] Figure 4 It is a structural schematic diagram of the segment pre-assembly frame in the structure of the present invention;

[0035] Figure 5 yes Figure 2 Cross-sectional view of section AA;

[0036] Figure 6 is a right side sectional view of another embodiment;

[0037] Figure 7 This is a three-dimensional diagram after the mud box and part of the pipe segments are removed in the present invention;

[0038] Figure 8 yes Figure 7 The main view of the structure;

[0039] Figure 9 yes Figure 7 The structure is then dismantled with the bottom slide and the three-dimensional diagram of the segment disassembly and assembly device

[0040] Figure 10 Schematic diagram of the cross section of a single ring of segments assembly;

[0041] Figure 11 This is a full-section axonometric drawing of the assembly of 6 rings of segments;

[0042] Components in the figure: 1. Mud box; 2. Hydraulic tension and compression mechanism; 3. Segment jacking hydraulic cylinder; 4. Cantilever cylinder; 5. Outer ring; 6. Inner ring; 7. Support guide column; 8. Constraint plate; 9. Bottom slide; 10. Baffle assembly; 11. Support roller; 12. Segment pre-assembly frame; 13. Locking ring; 14. Data measuring device; 15. Transparent observation tube; 16. Shield limit position slot; 17. Shield tail brush; 18. Support guide column guide support; 19. Segment; 20. T-shaped sealing strip; 21. Positioning arc plate; 22. Screw; 23. Auxiliary forming plate; 24. Adhesive block; 25. Drive motor; 26. Sealing ring; 27. Shield; 28. Support guide column fixing block; 29. ​​Control console; 30. Elastic top block 31. Wireless distance acquisition device, except Figure 4 , disassemble the segment pre-assembly frame in other views. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0044] A segment floatation test device with stable and accurate process, see Figures 1 to 11, including a bottom slide 9, a mud box 1 installed on the bottom slide 9, a shield entry and exit device and a data measuring device are installed on one side of the mud box 1, and a pipe segment disassembly and assembly device is installed on the other side, a shield auxiliary support device is also provided on the pipe segment disassembly and assembly device, and a pipe segment auxiliary positioning device is also provided on the outer side of the shield entry and exit device, and the pipe segment auxiliary positioning device is installed in linkage with the data measuring device; the shield entry and exit device includes a shield assembly driven by a hydraulic rod of a hydraulic pulling and pressing mechanism, and also includes a constraint plate 8 fixed on one side of the shield assembly, the upper part of the constraint plate 8 is connected to the shield assembly, and the lower part of the constraint plate 8 is slidably mounted on the bottom slide 9, and a support guide column 7 and a support guide column guide support 18 are provided on the other side of the shield assembly, and a shield limit position slot 16 is provided in the mud box 1, corresponding to A supporting component for supporting guide columns and guiding supports 18 is provided at a position adjacent to the segment auxiliary positioning device, and an outlet hole is provided on the corresponding mud box 1 which also serves as a supporting guide column and guiding support 18; the segment auxiliary positioning device includes a rod-shaped cantilever tube 4, and a bracket is installed on the far bottom slide 9 end of the cantilever tube 4, and a driving motor 25 for driving the cantilever tube 4 to rotate is installed on the bracket, and a lead screw is connected to the cantilever tube 4 via an internal thread to drive the baffle assembly 10 to move, and the data measuring device is clamped on the baffle assembly 10, and the segment auxiliary positioning device also includes a locking ring 13 movably installed on the segment installation side; the segment auxiliary positioning device also includes a segment pre-installation frame 12, which is located between the mud box 1 and the segment jacking hydraulic cylinder 3 to form a circle-by-circle installation of the simulated segment.

[0045] In this embodiment, the baffle assembly 10 is cross-shaped, and elastic top blocks 30 are provided at the four ends thereof to achieve auxiliary radial reinforcement and positioning.

[0046] In this embodiment, a cylindrical transparent observation tube 15 is installed in the mud box 1, coaxially corresponding to the shield installation position, to facilitate observation and measurement of the ductility of the slurry.

[0047] The bottom of the mud box 1 is provided with an auxiliary support roller 11 of a shield auxiliary device. The shield shell is a double-layer structure with 8 grouting pipes embedded in it. The grouting pipelines are externally connected to a pressure regulating valve and a flow regulating valve.

[0048] The segments are fixed between adjacent simulated segments via T-shaped sealing rings and curved baffles. They have a T-shaped cross section, and a positioning curved plate 21 is provided on the inner wall of the simulated segment. The horizontal sides of the T are connected to the curved plate by screws 22. The top of the vertical sides of the T is an arc-shaped protrusion, or a plurality of crown-shaped protrusions are evenly distributed on the top surface. The adhesive block is filled with adhesive. Under pressure, the adhesive block breaks and the adhesive escapes, forming a bond.

[0049] The outer side of the simulated segment is equipped with an arcuate rubber seal, which forms a sealing ring after the segment is installed. The seal is installed in a sealing groove on the simulated segment. The groove is located between the 1 / 4 and 1 / 5 of the segment width, near the shield tail extension. In actual operation, auxiliary forming plates can be installed inside the segment between the seals to form a smooth inner wall.

[0050] This embodiment also relates to a testing method for a segment floating test device with a stable and accurate process, comprising the following steps:

[0051] (1) Assemble the shield inlet and outlet device, the pipe segment disassembly device and the mud box 1: on the bottom slide 9, the pipe segment disassembly device, the mud box 1 and the shield inlet and outlet device are installed in sequence from one end to the other end. The end of the pipe segment disassembly device is located at the pipe segment inlet and outlet on the mud box 1. A card slot for limiting the limit position of the shield is provided in the mud box 1. The length of the mud box 1 is not less than the length of the shield pipe formed by the shield. At least two support rollers 11 are provided below the working area of ​​the shield pipe. The horizontal degree of freedom between the shield inlet and outlet device and the mud box 1 is limited by hydraulic rods on both sides, and the rotational degree of freedom is limited by the support below. Then, a replacement gasket is installed at the tail of the shield inlet and outlet device, and a support guide column 7 is installed on the replacement gasket through the mud box 1. The corresponding support guide column 7 cooperates with the support roller 11 below the shield pipe before disassembly;

[0052] (2) Assembling the data measuring device: the hydraulic rod drives the lower shield in-and-out device to move to the limit position of the shield outside the mud box 1, and the segment auxiliary positioning device is installed in the shield pipeline with the same gravity axis. Then the data measuring device is clamped in the baffle assembly 10 of the segment auxiliary positioning device;

[0053] (3) Assembling the segments to form a simulated tunnel pipeline: remove the rear plate of the mud box 1 and the support guide column 7 on the shield tube. The segment support point is outside the mud box 1 and tangent to the outer contour of the segment. The segment disassembly and assembly device is provided with a segment push-pull hydraulic cylinder until the segments are assembled circle by circle for 20 times to form a simulated segment circle group. At the same time, the last segment protrudes more than 140 cm from the mud box, which is 50 cm in this embodiment. Then, remove the replacement gasket on the last formed tube ring and install the shield tail brush 17 to form the shaft sleeve matching of the shield shell and the tube shell in this step. Then, install the shield tail brush 17 pressing block and the support guide column fixing block 28 on the shield tail brush 17;

[0054] (4) Positioning of the simulated segment ring: The shield plate inlet and outlet device drives the shield plate and the simulated segment ring group in step (3) to move to the tail end of the simulated segment ring group, which is close to the end of the measuring device. After that, the rear plate of the mud box 1 is installed, and the support guide column 7 is installed through the rear plate for the second time. Then, grouting is started through the grouting pipe pre-installed in the segment, and the mud box 1 cover is covered;

[0055] (5) Start measuring and record data: The shield inlet and outlet device drives the shield out of the mud box 1, and the measuring device measures the floating condition of each segment ring and records the result, which is transmitted to the server via the information transmission line.

[0056] In step (4), the first end is fixed and the first end is not fixed. In this embodiment, the first end is fixed, including stopping when the end face of the connecting frame at the fixed end of the pipe segment coincides with the outer end face of the mud box 1, fixing it to the mud box 1, adjusting the position of the pipe segment retaining frame to make it close to the end face of the first ring pipe segment and against the baffle of the pipe segment auxiliary positioning device, and installing the locking ring 13 at the other end of the simulated pipe segment ring group.

[0057] In this embodiment, a transparent cover installation step can be added before step (3): the shield plate entry and exit device is moved and assembled, and a transparent box pad and a transparent cover are installed in the mud box 1, and the transparent cover is coaxial with the shield shell ring formed by the shield shell.

[0058] This test platform simulates the upward movement of segment rings as they emerge from the shield casing. The principle is as follows: A synchronous grouting slurry is filled inside the casing. When the shield casing is pulled out of the casing, simulating the tunneling process, the segments are sequentially released from the shield tail. The buoyancy of the slurry causes the segments to move upward or downward.

[0059] The shield propulsion system is activated, and the horizontal servo hydraulic cylinder propels the shield at a constant speed. Each time the shield completely passes a segment, the rear stabilizer moves backwards a certain distance. The compression of the gaskets between the segments must be calculated to release their elasticity. The shield connector is rigidly connected to the shield, and the slider and the housing outlet form two fulcrums, ensuring that the shield does not tilt and that its motion is linear. The servo hydraulic cylinder ensures precise control of the shield's travel distance.

[0060] The shield propulsion system can be manually controlled for both forward distance and speed. Parameters for data collection points within the segment are controlled based on the distance to zero. Each data collection point's parameters can be entered on-site at the control console or pre-edited and imported for automatic control. The segment stabilizer system automatically controls each retreat by inputting the retreat distance.

[0061] This equipment can be used to study the floating characteristics of the segment structure under grouting fluids of different properties. By configuring grouting fluids of different properties and changing the slurry parameters, the floating of the segment in grouting fluids of different properties can be simulated. The specific test steps are as follows:

[0062] (1) Test-run the platform equipment and check to make sure the control system can work normally.

[0063] (2) Install the platform in sequence and inject grouting liquid into the model box.

[0064] (3) Push the shield shell forward at a certain speed, wait until the segments are completely out of the shield tail, and then shut down the propulsion system.

[0065] (4) The data acquisition system records the sensor data;

[0066] (5) Observe the floating shape of the tube segment and record the floating time.

[0067] (6) Extract the grouting liquid and return the shield to its original position.

[0068] (7) Replace the grouting fluid and refill the model box, repeating test steps 3 to 6. Study the floating law of the pipe segments under the circumferential uniform diffusion of grouts with different properties.

[0069] (8) Organize and analyze the measured data.

[0070] This equipment can be used to study the floating characteristics of the segment structure under different excavation speeds and slurries with different performances. The excavation speed is controlled by a hydraulic cylinder. The specific test steps are as follows:

[0071] (1) Test-run the platform equipment and check to make sure the control system can work normally.

[0072] (2) Install the platform in sequence and inject grouting liquid into the model box.

[0073] (3) Push the shield shell forward at a certain speed, wait until the segments are completely out of the shield tail, and then shut down the propulsion system.

[0074] (4) The data acquisition system records the sensor data;

[0075] (5) Observe the floating shape of the tube segment and record the floating time.

[0076] (6) Extract the grouting liquid and return the shield to its original position.

[0077] (7) Adjust the advancement speed and repeat test steps 3 to 6. Study the floating behavior of the segments under different advancement speeds and circumferentially uniform diffusion of slurries with different performance.

[0078] (8) Organize and analyze the measured data.

[0079] This equipment can be used to study the buoyancy characteristics of the segment structure under different slurry control conditions. By changing the thickness of the shield shell, different shield tail gaps can be simulated. The specific test steps are as follows:

[0080] (1) Test-run the platform equipment and check to make sure the control system can work normally.

[0081] (2) Install the platform in sequence and inject grouting liquid into the model box.

[0082] (3) Push the shield shell forward at a certain speed, wait until the segments are completely out of the shield tail, and then shut down the propulsion system.

[0083] (4) The data acquisition system records the sensor data;

[0084] (5) Observe the floating shape of the tube segment and record the floating time.

[0085] (6) Extract the grouting liquid and return the shield to its original position.

[0086] (7) Adjust the grouting points and grouting time sequence, and repeat test steps 3 to 6. Study the floating law of the pipe segment under different slurry diffusion conditions, such as uniform slurry diffusion in the annular direction, top delayed grouting, and bottom delayed grouting.

[0087] (8) Organize and analyze the measured data.

[0088] Example 2

[0089] The principle of this embodiment is the same as that of embodiment 1, with the specific difference being that step (3) is replaced by a complete ring of scaled segments assembled on the ground, then hoisted and placed on the segment bracket, and then the entire ring is pushed into the shield using a hydraulic cylinder. During operation, a complete ring of scaled segments is assembled on the ground, then hoisted and placed on the segment bracket, and then the entire ring is pushed into the shield using a hydraulic cylinder. The advantage is that the assembled segments can be adjusted and pushed into the shield at one time.

[0090] Example 3

[0091] The principle of this embodiment is the same as that of embodiment 1, with the specific difference being that in step (4), the segment is fixed at the head end, which includes stopping the segment end face 30-35 mm away from the inner end face of the mud box 1, and adjusting the segment retaining frame position so that it is in close contact with the end face of the first ring segment and abuts against the baffle of the segment auxiliary positioning device. This creates a unilateral suspension effect, which facilitates improving the data performance of the measurement in this state.

[0092] Example 4

[0093] The principle of this embodiment is the same as that of embodiment 1, with the specific difference being that the grouting of the mud box 1 is replaced by installation during filling, auxiliary rollers are installed at the bottom of the pipe segments in the mud box 1, and the support guide columns 7 are removed at the same time, and the reserved guide column holes are sealed with bumps.

[0094] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A segment floatation test device with stable and accurate process, characterized by: A bottom slide (9), a mud box (1) mounted on the bottom slide (9), a shield entry and exit device and a data measuring device mounted on one side of the mud box (1), and a pipe segment disassembly and assembly device mounted on the other side, a shield auxiliary support device also being provided on the pipe segment disassembly and assembly device, a pipe segment auxiliary positioning device being also provided on the outer side of the shield entry and exit device, and the pipe segment auxiliary positioning device being simultaneously mounted in linkage with the data measuring device; The shield in-and-out device includes a shield assembly driven by a hydraulic rod of a hydraulic tensioning and pressing mechanism, and also includes a constraint plate (8) fixed on one side of the shield assembly, the upper part of the constraint plate (8) is connected to the shield assembly, and the lower part of the constraint plate (8) is slidably mounted on the bottom slide (9), and the other side of the shield assembly is provided with a support guide column (7) and a support guide column guide support (18), a shield limit position slot (16) is provided in the mud box (1), and a support component of a support guide column guide support (18) is provided at a position adjacent to the pipe segment auxiliary positioning device, and an outlet hole is provided on the corresponding mud box (1) and serves as a support guide column guide support (18); The segment auxiliary positioning device includes a rod-shaped cantilever tube (4), a bracket is installed on the cantilever tube (4) at the end far from the bottom slide (9), a driving motor (25) is installed on the bracket to drive the cantilever tube (4) to rotate, a lead screw is connected to the cantilever tube (4) via an internal thread to drive the baffle assembly (10) to move, the data measuring device is clamped on the baffle assembly (10), and the segment auxiliary positioning device also includes a locking ring (13) movably installed on the segment installation side; The segment auxiliary positioning device further comprises a segment pre-installation rack (12), wherein the segment pre-installation rack (12) is located between the mud box (1) and the segment jacking hydraulic cylinder (3) to form a circle-by-circle installation of simulated segments.

2. The apparatus for segment floating test with stable and accurate process as claimed in claim 1, characterized in that: A columnar transparent observation tube (15) is installed in the mud box (1) coaxially corresponding to the shield installation position.

3. The apparatus for segment floating test with stable and accurate process as claimed in claim 1, characterized in that: The bottom of the mud box (1) is provided with an auxiliary support roller (11) of the shield auxiliary device. The shield shell is a double-layer structure and is embedded with 8 grouting pipes. The grouting pipes are externally connected to a pressure regulating valve and a flow regulating valve.

4. The apparatus for testing a segment floatation with stable and accurate process according to claim 1, characterized in that: The segments are fixedly installed between adjacent simulated segments via T-shaped sealing rings and arc-shaped baffles, and have a T-shaped cross section. A positioning arc-shaped plate (21) is provided on the inner side wall of the simulated segment. The horizontal side of the T is connected to the arc-shaped plate via screws (22). The top of the vertical side of the T is an arc-shaped protrusion, or a plurality of crown-shaped protrusions are evenly distributed in an array on the top surface.

5. The apparatus for testing a segment floatation with stable and accurate process according to claim 1, characterized in that: An arc-shaped outer rubber sealing strip is provided on the outside of the simulated segment, and the sealing strip forms a sealing ring after the segment is installed. The outer rubber sealing strip is installed in a sealing groove on the simulated segment. The sealing groove is located at the 1 / 4-1 / 5 position of the segment in the horizontal direction, close to the direction of the shield tail dragging end.

6. The testing method of the segment floating test device with stable and accurate process as claimed in claim 1 is characterized in that: The following steps are involved: Assembling the shield in-and-out device, the pipe segment disassembly device and the mud box (1): on the bottom slide (9), the pipe segment disassembly device, the mud box (1) and the shield in-and-out device are sequentially installed from one end to the other end, the end of the pipe segment disassembly device is located at the pipe segment inlet and outlet of the mud box (1), and a slot for limiting the limit position of the shield is provided in the mud box (1). The length of the mud box (1) is not less than the length of the shield pipe formed by the shield, and at least two support rollers (11) are provided below the working area of ​​the shield pipe. The horizontal degree of freedom between the shield in-and-out device and the mud box (1) is limited by hydraulic rods on both sides, and the rotational degree of freedom is limited by the support below. Then, a replacement gasket is installed at the tail of the shield in-and-out device, and a support guide column (7) is installed on the replacement gasket through the mud box (1), and the corresponding support guide column (7) cooperates with the support roller (11) below the shield pipe before disassembly; (2) Assembling the data measuring device: the hydraulic rod drives the lower shield plate in-and-out device to move to the limit position of the shield plate outside the mud box (1), and the pipe segment auxiliary positioning device is installed in the shield plate pipeline on the same gravity axis, and then the data measuring device is clamped in the baffle assembly (10) of the pipe segment auxiliary positioning device; (3) Assembling the segments to form a simulated tunnel pipe: remove the rear plate of the mud box (1) and the support guide column (7) on the shield tube. The segment support point is outside the mud box (1) and tangent to the outer contour of the segment. The segment disassembly and assembly device is provided with a segment push-pull hydraulic cylinder until the segments are assembled circle by circle for 20 times to form a simulated segment circle group. At the same time, the last segment protrudes more than 40 cm from the mud box (1). Then, remove the replacement gasket on the last formed tube circle and install the shield tail brush (17) to form the shaft sleeve matching of the shield shell and the tube shell in this step. Then, install the shield tail brush (17) pressing block and the support guide column fixing block (28) on the shield tail brush (17); (4) Positioning of the simulated segment ring: The shield entry and exit device drives the shield and the simulated segment ring group in step (3) to move to the tail end of the simulated segment ring group, that is, close to the end of the measuring device. After that, the rear plate of the mud box (1) is installed, and the supporting guide column (7) is installed through the rear plate. Then, grouting is started through the grouting pipe pre-installed in the segment, and the mud box (1) cover is closed; (5) Start measuring and record data: The shield inlet and outlet device drives the shield out of the mud box (1), and the measuring device measures the floating condition of each pipe segment ring and records the result, which is transmitted to the server via the information transmission line.

7. The testing method of the segment floating test device with stable and accurate process as claimed in claim 6, characterized in that: In step (4), the first end is fixed and the first end is not fixed. The first end is fixed, and the end face of the segment fixing end connecting frame is stopped when the end face of the segment fixing end is coincident with the outer end face of the mud box (1), and the segment is fixed to the mud box (1). The position of the segment retaining frame is adjusted so that it is close to the end face of the first ring segment and abuts against the baffle of the segment auxiliary positioning device. The locking ring (13) is installed at the other end of the simulated segment ring group. The first end is not fixed, and the segment end face is stopped at 30-35 mm away from the inner end face of the mud box (1). The position of the segment retaining frame is adjusted so that it is close to the end face of the first ring segment and abuts against the baffle of the segment auxiliary positioning device.

8. The testing method of the segment floating test device with stable and accurate process as claimed in claim 7, characterized in that: Before step (3), a transparent cover installation step is added: the shield plate inlet and outlet device is moved and assembled, and a transparent box pad and a transparent cover are installed in the mud box (1), and the transparent cover is coaxial with the shield shell ring formed by the shield shell.

9. The testing method of the segment floating test device with stable and accurate process as claimed in claim 8, characterized in that: The grouting of the mud box (1) is replaced by filling when it is installed. Auxiliary rollers are installed at the bottom of the pipe segment in the mud box (1). At the same time, the support guide column (7) is removed and the reserved guide column hole is sealed with a convex block.

10. The testing method of the segment floating test device with stable and accurate process as claimed in claim 6, characterized in that: Step (3) is replaced by a whole ring of scaled segments assembled on the ground, which are then hoisted and placed on the segment bracket, and then the whole ring is pushed into the shield using a propulsion hydraulic cylinder.

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