Intelligent monitoring device and method for thrust of earth pressure balance shield machine in shield tunnel

Abstract

The present invention discloses an intelligent monitoring device and method for thrust of a shield machine for earth pressure balance in a shield tunnel, and specifically relates to the technical field of shield construction. The device includes a shield machine body, in which a propulsion unit is arranged, and the propulsion unit is composed of multiple groups of propulsion hydraulic cylinders and support shoe assemblies; the support shoe assembly includes a shoe plate and a support pressure plate, the shoe plate is fixedly mounted on the output end of the propulsion hydraulic cylinder, the support pressure plate is connected to the shoe plate through a pad, and a thrust monitoring assembly is arranged between the support pressure plate and the shoe plate; the thrust monitoring assembly includes a bending structure and a first pressure detection unit. The present invention arranges a thrust monitoring assembly in each group of support shoe assemblies, which can accurately monitor the thrust parameters of each support shoe assembly during propulsion, effectively analyze and monitor the propulsion status and propulsion posture of the shield machine body, and can make timely adjustments to avoid large differences in the thrust of each support shoe assembly and affect the propulsion posture of the shield machine body, thereby reducing losses.

Description

Technical Field

[0001] The present invention relates to the technical field of shield construction, and more specifically to a device and method for intelligently monitoring thrust of an earth pressure balance shield machine in a shield tunnel. Background Art

[0002] The basic principle of the earth pressure balance shield is to use a tangible steel component to excavate the soil along the tunnel design axis and advance forward. The earth pressure balance shield is a closed shield. Another function of the shield is to withstand the pressure from the stratum and prevent the invasion of groundwater or quicksand.

[0003] The basic principle of shield tunneling is that before the initial or final tunnel lining is built, the main function is to protect the excavated soil and ensure the safety of workers and mechanical equipment. This steel component is simply called a shield. Another function of the shield is to withstand the pressure from the stratum and prevent the invasion of groundwater or quicksand. When the shield advances, its front cutter rotates to excavate the stratum soil, and the cut soil enters the soil chamber. When the soil fills the soil chamber, its passive earth pressure is basically balanced with the earth pressure and water pressure on the excavation face, so that the excavation face and the shield face are in a balanced state (i.e. stable state).

[0004] The propulsion of the shield machine is mainly achieved by the cooperation of the main propulsion hydraulic cylinder and the segments. The shield machine is usually equipped with multiple hydraulic cylinders, which push the cutterhead and the entire machine forward by applying huge thrust to the installed segments.

[0005] In order to ensure the stable progress of shield construction, the shield machine also needs to be equipped with a complex intelligent control system to monitor and adjust various parameters during the excavation process, such as thrust, cutter head speed, and pressure of the mud or hydraulic support system.

[0006] During the construction of a large-diameter shield machine, the external construction environment of the shield is relatively complex and the geological conditions may change suddenly at any time. The shield is prone to unexpected phenomena such as getting stuck, which will affect the construction progress of the project. Therefore, it is necessary to detect the stress condition of the shield body in advance and conduct intelligent analysis through the shield system, so that timely adjustments can be made when parameters change suddenly to reduce losses.

[0007] In the prior art, the thrust detection of the propulsion system mainly involves detecting the oil pressure of the propulsion hydraulic cylinder and then calculating the parameters of the hydraulic cylinder to obtain the thrust of the hydraulic cylinder. However, the installed power of the shield propulsion system is large and the energy consumption is high. In order to reduce the control cost and reduce the control complexity, a certain number of hydraulic cylinders distributed along the circumference of the shield are usually divided into zones, and proportional control valves are used to achieve compound control of the pressure and flow in each zone. Due to the introduction of hydraulic valves such as proportional pressure valves and proportional speed control valves, energy losses such as overflow loss, throttling loss, and leakage loss are inevitably generated, which may easily lead to unpredictable errors in the detection and calculation of oil pressure and thrust. Moreover, some hydraulic cylinders need to be controlled synchronously and share a hydraulic oil circuit. It is difficult to accurately detect each support shoe separately during detection. Therefore, the thrust detection system of the prior art is prone to large errors, and the monitoring parameters are not rich enough, and the parameter analysis of the shield machine is not perfect enough, which may also easily lead to the difficulty of the shield system to adjust parameters in a timely and accurate manner to reduce losses when facing emergencies. Summary of the invention

[0008] The intelligent monitoring device and method for thrust of an earth pressure balance shield machine in a shield tunnel provided by the present invention aim to solve the following problems: the existing method of calculating thrust by detecting the oil pressure in the hydraulic circuit of the propulsion hydraulic cylinder is prone to unpredictable errors, making it difficult to accurately detect each support shoe individually, and the monitoring parameters are not rich enough, and the parameter analysis of the shield machine is not perfect, which can easily lead to the difficulty of timely and accurate parameter adjustment of the shield system to reduce losses when facing emergencies.

[0009] To achieve the above-mentioned object, the present invention provides the following technical solutions: an intelligent monitoring device for thrust of an earth pressure balance shield machine in a shield tunnel, comprising a shield machine body, in which a propulsion unit is arranged, and the propulsion unit is composed of a plurality of propulsion hydraulic cylinders and a support shoe assembly;

[0010] The shoe support assembly includes a shoe plate and a support pressure plate. The shoe plate is fixedly mounted on the output end of the propulsion hydraulic cylinder. The support pressure plate is connected to the shoe plate through a pad. A thrust monitoring assembly is arranged between the support pressure plate and the shoe plate.

[0011] The thrust monitoring assembly includes a bending structure and a first pressure detection unit. A monitoring cavity is provided inside the boot plate, and the bending structure is installed in the monitoring cavity. A pressure structure is fixedly connected to one side of the support plate close to the boot plate. The pressure structure is slidably inserted into the boot plate. The two ends of the bending structure are respectively fixedly connected to the boot plate and the pressure structure. The bending structure is an elastic strip structure. The bending structure has the ability to generate bending deformation when subjected to lateral pressure from the pressure structure. The first pressure detection unit is provided on the side of the bending structure that protrudes when the above-mentioned bending deformation is generated.

[0012] In a preferred embodiment, multiple groups of pressure structures and thrust monitoring components are arranged between the support plate and the shoe plate, and the bending structures in each group of thrust monitoring components are also arranged in multiple numbers, and the multiple bending structures are distributed circumferentially in the monitoring cavity.

[0013] In a preferred embodiment, the pad is arranged between the boot plate and the support plate, and a bolt structure is fixedly connected to the support plate. The bolt structure passes through the pad and the boot plate. A nut is arranged in the boot plate and the nut is threadedly connected to the bolt structure.

[0014] In a preferred embodiment, the bending structure is an arc-shaped structure in a naturally stretched state, and the convex portion of the arc-shaped structure is arranged toward the first pressure detection unit, and a groove is arranged on the side of the bending structure away from the first pressure detection unit and at the position corresponding to the first pressure detection unit.

[0015] In a preferred embodiment, elastic filling pieces are provided in the grooves, and each elastic filling piece is used to provide elastic force in opposite directions to the inner walls on both sides of the grooves. A guide seat is provided at the detection end of the first pressure detection unit, a card slot is provided in the guide seat, and the bending structure is snap-fitted and installed in the card slot of the guide seat.

[0016] In a preferred embodiment, the pressure structure includes a first pressure piece and a second pressure piece, the first pressure piece is fixedly connected to the support plate, the second pressure piece is fixedly connected to the bending structure, the first pressure piece and the second pressure piece are both slidably inserted in the boot plate, and a ball is arranged between the first pressure piece and the second pressure piece, the diameters of the second pressure piece and the corresponding sockets of the boot plate are the same, and the diameter of the first pressure piece is smaller than the diameter of the socket.

[0017] In a preferred embodiment, a movable rod is provided in the first pressure member, and the movable rod slides through the support plate, the first pressure member and the second pressure member, a piston cavity is provided inside the first pressure member, a piston member is provided on the movable rod, the piston member is slidably installed in the piston cavity, an elastic member is provided between the piston member and the first pressure member, the elastic member is used to drive the piston member to move in a direction away from the shoe plate, an extrusion plate is provided at the end of the piston member, the piston cavity of the first pressure member is connected with the monitoring cavity, a through hole connected to the outside is provided on the monitoring cavity, a pressure touch switch is provided in the monitoring cavity, the pressure touch switch is used to control the opening and closing of the first pressure detection unit, and one end of the movable rod corresponding to the pressure touch switch is set as a pressure touch part.

[0018] In a preferred embodiment, a hydraulic monitoring assembly is provided at the shield tail of the shield machine body, the hydraulic monitoring assembly is arranged corresponding to the grouting area between the pipe segment and the tunnel wall, and multiple groups of hydraulic monitoring assemblies are provided, a shield tail brush is arranged between the shield tail of the shield machine body and the pipe segment, the hydraulic monitoring assembly includes a fixed seat and a pressure seat, the fixed seat is fixedly mounted on the shield tail brush, the pressure seat is slidably mounted on the fixed seat, and a second pressure detection unit is arranged between the fixed seat and the pressure seat.

[0019] In a preferred embodiment, the outside of the pressure seat is fixedly connected to an outer casing, the inside of the outer casing is fixedly connected to a conical cover, and one end of the conical cover away from the outer casing is slidably fitted with the outer wall of the fixed seat.

[0020] The thrust intelligent monitoring method of earth pressure balance shield machine in shield tunnel comprises the following steps:

[0021] Step 1: Install the bending structure and the first pressure detection unit in the shoe plate, and assemble the shoe plate, the support plate and the pad to form an improved support shoe assembly;

[0022] Step 2: Replace and install the improved support shoe assembly on the output end of the propulsion hydraulic cylinder, and install the hydraulic monitoring assembly on the shield tail brush;

[0023] Step 3: Drive the shield machine to work and start the propulsion system of the shield machine to install the segments and propel the shield machine;

[0024] Step 4: Detecting the deformation force of the bending structure generated by the lateral pressure formed by the thrust force through the first pressure detection unit at each position, and obtaining the lateral pressure borne by the bending structure according to the database of the bending structure itself;

[0025] Step 5: Calculate the thrust generated by a single set of support shoe assemblies according to the number of thrust monitoring assemblies and the number of bending structures, and perform data analysis by the control system of the shield machine;

[0026] Step 6: Detect the slurry pressure at the shield tail through multiple sets of hydraulic monitoring components to determine the thrust effect of the slurry on the shield body;

[0027] Step 7: The control system of the shield machine comprehensively analyzes the data of the first pressure detection unit and the second pressure detection unit, and adjusts the control of the propulsion system of the shield machine according to the data structure.

[0028] The beneficial effects of the present invention are as follows: the present invention arranges a thrust monitoring component in each group of support shoe assemblies, and therefore can accurately monitor the thrust parameters of each support shoe assembly during advancement, can effectively analyze and monitor the advancement status and advancement posture of the shield machine body, and can make timely adjustments to avoid large differences in the thrust of each support shoe assembly and affect the advancement posture of the shield machine body, can effectively avoid the occurrence of problems such as excavation jamming, reduce losses, and the obtained monitoring parameters can effectively reduce errors, and the monitoring parameters are richer, thereby making the shield system's parameter analysis of the shield machine more complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0030] Figure 2 It is a schematic diagram of the shield machine advancing state of the present invention.

[0031] Figure 3 This is a distribution diagram of the support shoe structure in the shield machine body of the present invention.

[0032] Figure 4 It is a structural schematic diagram of the thrust monitoring assembly in the support shoe structure of the present invention.

[0033] Figure 5 It is an enlarged structural diagram of the thrust monitoring assembly of the present invention.

[0034] Figure 6 This is a diagram showing the circumferential distribution of the bending structures of the present invention in the monitoring cavity.

[0035] Figure 7 This is a force analysis diagram of the pressure generated on the first pressure detection unit after the bending structure of the present invention is bent by thrust.

[0036] Figure 8 It is a structural schematic diagram of an improved bending structure of the present invention.

[0037] Fig. 9 It is a structural schematic diagram of another improved bending structure of the present invention.

[0038] Fig.10 It is a structural schematic diagram of the improved pressure-applying structure of the present invention.

[0039] Fig.11 The present invention is a schematic structural diagram of a thrust monitoring assembly after adding an active rod.

[0040] Fig.12 For the present invention Figure 2 A-section structure enlarged view.

[0041] Fig.13 It is an enlarged structural diagram of the hydraulic monitoring component of the present invention.

[0042] Fig.14 The present invention is a flow chart of the monitoring method.

[0043] The accompanying drawings are marked as follows: 1. Shield body; 11. Propulsion hydraulic cylinder; 12. Support shoe assembly; 121. Shoe plate; 122. Support pressure plate; 123. Pad; 124. Monitoring chamber; 13. Shield tail brush; 2. Thrust monitoring assembly; 21. Bending structure; 211. Groove; 212. Elastic filling member; 22. First pressure detection unit; 23. Guide seat; 24. Pressurized switch; 3. Pressure structure; 31. First pressure member; 32. Second pressure member; 33. Ball; 34. Movable rod; 35. Piston member; 4. Segment; 5. Hydraulic monitoring assembly; 51. Fixed seat; 52. Pressure seat; 53. Second pressure detection unit; 54. Outer casing; 55. Conical cover. DETAILED DESCRIPTION

[0044] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0045] Refer to the instruction manual Figures 1 to 13 The invention discloses an intelligent monitoring device for thrust of an earth pressure balance shield machine in a shield tunnel, comprising a shield body 1, wherein a propulsion unit is arranged in the shield body 1, and the propulsion unit is composed of a plurality of propulsion hydraulic cylinders 11 and a support shoe assembly 12, wherein the propulsion hydraulic cylinder 11 is fixedly arranged in the shield body 1, and the support shoe assembly 12 is fixedly installed on the output end of the propulsion hydraulic cylinder 11. The support shoe assembly 12 is driven by the propulsion hydraulic cylinder 11 to move and push the pipe segment 4, so that the pipe segment 4 can be assembled. After the pipe segment 4 is assembled and fixed, the propulsion hydraulic cylinder 11 drives the support shoe assembly 12 to form a thrust on the pipe segment 4, thereby forming a reverse force on the shield body 1, thereby realizing the propulsion drive of the shield body 1.

[0046] In order to more accurately detect the thrust of each shoe assembly 12, so as to more accurately monitor the thrust of the shield machine body 1, in this embodiment, refer to the attached manual. Figure 4 and Figure 5 The shoe support assembly 12 includes a shoe plate 121 and a support and pressure plate 122. The shoe plate 121 is fixedly mounted on the output end of the thrust hydraulic cylinder 11. The support and pressure plate 122 is connected to the shoe plate 121 through a pad 123. Multiple thrust monitoring components 2 are arranged between the support and pressure plate 122 and the shoe plate 121.

[0047] The thrust monitoring assembly 2 includes a bending structure 21, a monitoring cavity 124 is provided inside the shoe plate 121, the bending structure 21 is installed in the monitoring cavity 124, a pressure structure 3 is fixedly connected to the side of the support plate 122 close to the shoe plate 121, the pressure structure 3 passes through the pad 123, and is slidably inserted with the shoe plate 121, one end of the bending structure 21 is fixedly connected to the shoe plate 121, and the other end of the bending structure 21 is fixedly connected to the pressure structure 3, the bending structure 21 is an elastic strip structure (preferably a metal material, such as a spring steel material), and the bending structure 21 has the ability to generate bending deformation when subjected to lateral pressure from the pressure structure 3, and the thrust monitoring assembly 2 also includes a first pressure detection unit 22, the first pressure detection unit 22 is arranged on the side of the bending structure 21 that protrudes when it generates bending deformation, and the detection end of the first pressure detection unit 22 and the bending structure 21 are compressed to generate bending deformation The first pressure detection unit 22 detects the magnitude of the force component perpendicular to the lateral pressure of the pressure structure 3 when the bending structure 21 is bent and deformed, and then, based on the known parameters of the bending structure 21 itself, when the lateral force component of the bending structure 21 is detected when the bending structure 21 is bent and deformed, the pressure of the pressure structure 3 carried by the single bending structure 21 can be determined (for example, a simulation test can be performed on the single bending structure 21, and different lateral pressures can be applied to the pressure structure 3 to obtain the parameters detected by the first pressure detection unit 22 after the corresponding bending structure 21 is deformed, thereby establishing a database for intelligent control and detection), and then, based on parameters such as the number of the pressure structure 3 and the thrust monitoring assembly 2, the thrust between the support shoe assembly 12 at a single position and the pipe segment 4 can be determined, thereby achieving detailed monitoring and analysis of the thrust of the shield body 1.

[0048] In the present embodiment, a thrust monitoring component 2 is provided in each group of support shoe assemblies 12. Therefore, the thrust parameters of each support shoe assembly 12 during advancement can be accurately monitored, the advancement status and advancement posture of the shield machine body 1 can be effectively analyzed and monitored, and timely adjustments can be made to avoid large differences in the thrust of each support shoe assembly 12 and affect the advancement posture of the shield machine body 1, and the occurrence of problems such as jamming during excavation can be effectively avoided, and losses can be reduced. In addition, the present embodiment performs detailed monitoring of each support shoe assembly 12, and the monitoring parameters obtained can effectively reduce errors, and the monitoring parameters are richer, thereby making the shield system's parameter analysis of the shield machine more complete.

[0049] It should be noted that the thrust of the shield machine 1 is relatively large, so the thrust borne by each support shoe assembly 12 is also relatively large. If a sensor is used directly to detect the thrust borne by the support shoe assembly 12, the stress borne by the sensor is relatively large, and the performance and strength requirements of the sensor are relatively high, which is not easy to achieve. Moreover, the life and accuracy of the sensor subjected to high pressure for a long time will be greatly reduced. Therefore, this embodiment uses a bending structure 21 and sets the first pressure detection unit 22 on the side of the bending structure 21. It does not directly detect the lateral pressure generated by the support plate 122 during advancement, but uses the reverse pressure formed by the support plate 122 and the pipe segment during advancement to squeeze the bending structure 21 through the pressure structure 3, so that the bending structure 21 is bent and deformed. Refer to the attached figure of the specification. Figure 7 When the bending structure 21 is bent and deformed, the pressure generated on the first pressure detection unit 22 belongs to the component force of the above-mentioned thrust. After decomposition, the pressure on the first pressure detection unit 22 is relatively small, which greatly reduces the lateral pressure formed by the thrust to be detected by the bending of the bending structure 21, and judges the large thrust borne by the support shoe assembly 12 by detecting the small pressure. Therefore, the requirements for the first pressure detection unit 22 are not high, and the detection pressure borne by the first pressure detection unit 22 is relatively small, which is not easy to cause damage to the first pressure detection unit 22, and the detection of the first pressure detection unit 22 is more stable and accurate.

[0050] In the above embodiment, since the thrust of the support plate 122 is mainly borne by the bending structure 21, if the number of bending structures 21 used is small, the pressure borne by a single bending structure 21 is relatively large. Figure 2 , 5 and 6. In the present embodiment, a plurality of pressure structures 3 and thrust monitoring components 2 may be arranged between the support plate 122 and the shoe plate 121, and a plurality of bending structures 21 in each group of thrust monitoring components 2 may also be arranged, and the plurality of bending structures 21 are circumferentially distributed in the monitoring cavity 124, so that the plurality of bending structures 21 may be distributed along a cylindrical shape, and when deformed by compression, each bending structure 21 bears the same pressure, and all bends toward the outside of the cylindrical distribution state, and the bending deformation amount is the same, and the number of first pressure detection units 22 in each group of thrust monitoring components 2 may also be set to a plurality of groups, and more groups of data may be detected to further improve the detection data, and arranging the thrust monitoring components 2 and the bending structures 21 in the form of a plurality of numbers may effectively share the overall pressure of the support shoe assembly 12, and avoid excessive pressure on a single component affecting its use.

[0051] Among them, in addition to setting up multiple groups of thrust monitoring components 2 and pressure structures 3, the pad 123 can also provide auxiliary load-bearing for the pad 123. For example, the pad 123 is set between the boot plate 121 and the support plate 122, and a bolt structure can be set on the support plate 122. The bolt structure passes through the pad 123 and the boot plate 121, and nuts are set in the boot plate 121 to tighten the bolts. The pad 123 also has elastic deformation ability, such as using a rubber structure or a commonly used polyurethane boot plate structure to bear the pressure of the support plate 122. At the same time, it does not affect the pressure transmission of the support plate 122 to the pressure structure 3 during propulsion, thereby ensuring the safe use of the equipment.

[0052] In the above embodiment, if a flat bending structure 21 is simply used, the bending direction may be unstable when it is bent by force, that is, it bends toward the side away from the first pressure detection unit 22. Therefore, in order to ensure that the deformation part of the bending structure 21 is concentrated and the deformation direction is fixed when it is compressed, refer to the attached manual. Figure 8 In this embodiment, the bending structure 21 is in a slightly arc-shaped structure when in a naturally stretched state without being subjected to force, and the convex portion of the arc-shaped structure is arranged toward the first pressure detection unit 22. A groove 211 is arranged on the side of the bending structure 21 that is away from the first pressure detection unit 22 and at a position corresponding to the first pressure detection unit 22. Therefore, when the bending structure 21 is subjected to lateral pressure, the bending structure 21 preferentially generates a bending deformation in the vicinity of the groove 211 that is away from the direction of the groove 211, thereby ensuring the stability of monitoring.

[0053] It should be noted that, please refer to the attached manual Fig. 9 Since the elastic strength of the groove 211 provided on the bending structure 21 is relatively low, in order to ensure that the bending structure 21 can withstand a large lateral pressure when the entire structure is bent, an elastic filling piece 212 is provided in each groove 211. Each elastic filling piece 212 is used to provide an elastic force in the opposite direction to the inner walls of the groove 211 on both sides. When the bending structure 21 is normally stretched, the groove 211 does not squeeze the elastic filling piece 212. Therefore, when the bending structure 21 is initially subjected to force, deformation in a fixed direction is preferentially generated, which causes the groove 211 to deform and squeeze the elastic filling piece 212. While ensuring the bending direction and position of the bending structure 21, it can also ensure that the bending structure 21 has sufficient supporting strength and is not easily damaged. At the same time, refer to the attached manual. Figure 6 A guide seat 23 is provided at the detection end of the first pressure detection unit 22, and a card slot is provided in the guide seat 23. The bending structure 21 is snap-fitted and installed in the card slot of the guide seat 23, thereby ensuring that the bending structure 21 will not deform in other directions, thereby improving the detection accuracy.

[0054] In the above embodiment, the pressure structure 3 is a carrier directly connecting the thrust monitoring component 2 and the support plate 122, and can directly transmit the thrust of the support plate 122. However, during the advancement of the shield machine body 1, some torsional forces will also be generated, such as the reverse torque generated when the cutter head of the shield machine body 1 moves and the forces in other directions caused by the inclination of the pipe segment 4 when assembling the pipe segment 4. When such forces are transmitted to the bending structure 21, it is easy to affect the monitoring of the thrust. Therefore, this embodiment also provides the following technical solutions, specifically, refer to the attached specification Fig.10 The pressure structure 3 includes a first pressure piece 31 and a second pressure piece 32. The first pressure piece 31 is fixedly connected to the support plate 122, and the second pressure piece 32 is fixedly connected to the bending structure 21. The first pressure piece 31 and the second pressure piece 32 are both slidably inserted in the shoe plate 121, and a ball 33 is arranged between the first pressure piece 31 and the second pressure piece 32, wherein the diameters of the second pressure piece 32 and the corresponding holes of the shoe plate 121 are the same, and the diameter of the first pressure piece 31 is slightly smaller than the diameter of the hole. With the help of the transmission of the ball 33, the thrust can be effectively transmitted and the forces in other directions can be isolated, thereby ensuring the accuracy of the detection of the first pressure detection unit 22.

[0055] For further information, please refer to the attached manual. Fig.11 A movable rod 34 is provided in the first pressure member 31, and the movable rod 34 slides through the support plate 122, the first pressure member 31 and the second pressure member 32. A piston cavity is provided inside the first pressure member 31, and a piston member 35 is provided on the movable rod 34. The piston member 35 is slidably installed in the piston cavity. An elastic member is provided between the piston member 35 and the first pressure member 31, and the elastic member is used to drive the piston member 35 to move in a direction away from the shoe plate 121. An extrusion plate is provided at the end of the piston member 35. The piston cavity of the first pressure member 31 is connected with the monitoring cavity 124. The monitoring cavity 124 is provided with a through hole connected to the outside world. A pressure touch switch 24 is provided in the monitoring cavity 124. The pressure touch switch 24 is used to control the opening and closing of the first pressure detection unit 22. One end of the movable rod 34 corresponding to the pressure touch switch 24 is set as a pressure touch part.

[0056] It should be noted that during the assembly and advancement of the pipe segment 4, the support shoe assembly 12 needs to constantly contact and move away from the pipe segment 4. When the support shoe assembly 12 moves away from the pipe segment 4, the movable rod 34 extends outward, and the movable rod 34 does not squeeze the pressure touch switch 24, and the first pressure detection unit 22 is powered off and stops working. When the support plate 122 needs to contact the pipe segment 4, the squeezing plate at the end of the movable rod 34 first contacts the pipe segment 4 and is squeezed obliquely, so that the pressure touch portion of the movable rod 34 squeezes the pressure touch switch 24, so that the first pressure detection unit 22 is powered on and turned on, thereby realizing automatic start and stop control of the first pressure detection unit 22. During the reciprocating motion of the movable rod 34, the reciprocating motion of the piston 35 can allow the outside air to circulate in the monitoring chamber 124, so that the environment of the first pressure detection unit 22 in the monitoring chamber 124 can be maintained at normal temperature, thereby avoiding the reciprocating motion of each component and the release of internal energy during deformation, which causes the temperature in the monitoring chamber 124 to be too high and affects the detection accuracy of the first pressure detection unit 22.

[0057] In the above-mentioned embodiment, synchronous grouting is also required during the shield construction process of the shield machine body 1. When the shield machine body 1 faces a high water pressure stratum or a loose soil layer or a sandy soil layer, the grouting pressure needs to be increased to ensure that the grouting material can fully penetrate and fill the underground voids, thereby stabilizing the surrounding geological environment. However, a large grouting pressure will also form a reverse force on the shield machine body 1 in the tunnel. Therefore, in order to better analyze the thrust of the shield machine body 1, it is also necessary to detect the slurry pressure on the shield tail of the shield machine body 1. Although a detection device for detecting the pressure of the pumped slurry is provided in the grouting pipeline in the prior art, the pressure of the slurry in the tunnel (the area between the pipe segment 4 and the tunnel wall) is different from the pressure of the slurry in the pipeline. Therefore, refer to the attached manual. Figure 2 and Fig.12 A hydraulic monitoring component 5 is arranged at the shield tail of the shield machine 1. The hydraulic monitoring component 5 is arranged corresponding to the grouting area between the pipe segment and the tunnel wall, and multiple groups of hydraulic monitoring components 5 can be arranged according to different heights to realize multi-point detection and improve the detection accuracy. A shield tail brush 13 is arranged between the shield tail of the shield machine 1 and the pipe segment. The hydraulic monitoring component 5 includes a fixed seat 51 and a pressure seat 52. The fixed seat 51 is fixedly installed on the shield tail brush 13, and the pressure seat 52 is slidably mounted on the fixed seat 51. A second pressure detection unit 53 is arranged between the fixed seat 51 and the pressure seat 52, and then the pressure of the slurry on the shield machine 1 is intuitively detected by squeezing the pressure seat 52 with the help of the slurry, so as to analyze the influence of the slurry pressure on the thrust of the shield machine 1.

[0058] It should be noted that an elastic member is also provided between the pressure seat 52 and the fixed seat 51 , and when the external slurry pressure decreases, the elastic member can push the pressure seat 52 to move outward, thereby enabling adaptive detection of the pressure change of the slurry.

[0059] Furthermore, in the above-mentioned embodiment, the slurry will gather on the outer wall of the fixed seat 51, and when the slurry is injected slowly, it is easy to form a viscous adhesion outside the fixed seat 51, thereby affecting the relative movement of the pressure seat 52 and the fixed seat 51. For this reason, the outside of the pressure seat 52 is fixedly connected to the outer casing 54, and the inside of the outer casing 54 is fixedly connected to the conical cover 55. The end of the conical cover 55 away from the outer casing 54 is slidably fitted with the outer wall of the fixed seat 51, and then in actual use, the pressure seat 52 will also produce relative movement with the change of the slurry pressure. Therefore, the conical cover 55 can scrape off the slurry on the surface of the fixed seat 51, especially under the pressure of the slurry, so that the conical cover 55 can be close to the surface of the fixed seat 51 to improve the cleaning effect.

[0060] It should be noted that the first pressure detection unit 22 and the second pressure detection unit 53 used in this embodiment can both adopt commonly used pressure sensor devices. The specific selection needs to be determined according to actual usage conditions, which will not be elaborated in this embodiment.

[0061] Refer to the instruction manual Fig.14 The present invention also provides a method for intelligently monitoring thrust of an earth pressure balance shield machine in a shield tunnel, comprising the following steps:

[0062] Step 1: Install the bending structure 21 and the first pressure detection unit 22 in the shoe plate 121, and assemble the shoe plate 121, the support plate 122 and the pad 123 to form an improved support shoe assembly 12;

[0063] Step 2: Replace and install the improved support shoe assembly 12 on the output end of the propulsion hydraulic cylinder 11, and install the hydraulic monitoring assembly 5 on the shield tail brush 13;

[0064] Step 3: drive the shield machine 1 to work, and start the propulsion system of the shield machine 1 to install the segments 4 and propel the shield machine 1;

[0065] Step 4: The first pressure detection unit 22 at each position detects the deformation force of the bending structure 21 when it is subjected to the lateral pressure formed by the thrust, and obtains the lateral pressure borne by the bending structure 21 according to the database of the bending structure 21 itself;

[0066] Step 5: Calculate the thrust generated by a single set of support shoe assemblies 12 according to the number of thrust monitoring assemblies 2 and the number of bending structures 21, and perform data analysis by the control system of the shield machine body 1;

[0067] Step 6: Detect the slurry pressure at the shield tail through multiple groups of hydraulic monitoring components 5, so as to determine the thrust effect of the slurry on the shield body 1;

[0068] Step 7: The control system of the shield machine body 1 performs a comprehensive analysis on the data of the first pressure detection unit 22 and the second pressure detection unit 53, and adjusts the control of the propulsion system of the shield machine body 1 according to the data structure.

[0069] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. Intelligent monitoring device for thrust of shield machine of earth pressure balance shield tunnel, characterized by: It comprises a shield machine body (1), wherein the shield machine body (1) is provided with a propulsion unit, the propulsion unit comprising a plurality of groups of propulsion hydraulic cylinders (11) and support shoe assemblies (12); The support shoe assembly (12) comprises a shoe plate (121) and a support and pressure plate (122), wherein the shoe plate (121) is fixedly mounted on the output end of the propulsion hydraulic cylinder (11), the support and pressure plate (122) is connected to the shoe plate (121) via a pad (123), and a thrust monitoring assembly (2) is provided between the support and pressure plate (122) and the shoe plate (121); The thrust monitoring assembly (2) comprises a bending structure (21) and a first pressure detection unit (22); a monitoring cavity (124) is provided inside the boot plate (121); the bending structure (21) is installed in the monitoring cavity (124); a pressure structure (3) is fixedly connected to a side of the support plate (122) close to the boot plate (121); the pressure structure (3) is slidably inserted into the boot plate (121); two ends of the bending structure (21) are respectively fixedly connected to the boot plate (121) and the pressure structure (3); the bending structure (21) is an elastic strip structure; the bending structure (21) has the ability to generate bending deformation when subjected to lateral pressure from the pressure structure (3); and the first pressure detection unit (22) is provided on a side of the bending structure (21) that protrudes when the bending deformation is generated; A plurality of groups of pressure structures (3) and thrust monitoring components (2) are arranged between the support plate (122) and the boot plate (121), and a plurality of bending structures (21) in each group of thrust monitoring components (2) are also arranged, and the plurality of bending structures (21) are distributed in a circular shape in the monitoring cavity (124); The pressure structure (3) comprises a first pressure piece (31) and a second pressure piece (32), wherein the first pressure piece (31) is fixedly connected to the support plate (122), and the second pressure piece (32) is fixedly connected to the bending structure (21), the first pressure piece (31) and the second pressure piece (32) are both slidably inserted in the boot plate (121), and a ball (33) is arranged between the first pressure piece (31) and the second pressure piece (32), the second pressure piece (32) and the corresponding insertion hole of the boot plate (121) have the same diameter, and the diameter of the first pressure piece (31) is smaller than the diameter of the insertion hole.

2. The intelligent monitoring device for thrust of earth pressure balance shield machine in shield tunnel according to claim 1 is characterized by: The pad (123) is arranged between the boot plate (121) and the support plate (122); a bolt structure is fixedly connected to the support plate (122); the bolt structure penetrates the pad (123) and the boot plate (121); a nut is arranged in the boot plate (121); the nut is threadedly connected to the bolt structure.

3. The intelligent monitoring device for thrust of earth pressure balance shield machine in shield tunnel according to claim 2 is characterized by: The bending structure (21) is an arc-shaped structure in a naturally stretched state, and a convex portion of the arc-shaped structure is arranged toward the first pressure detection unit (22), and a groove (211) is arranged on a side of the bending structure (21) away from the first pressure detection unit (22) and at a position corresponding to the first pressure detection unit (22).

4. The intelligent monitoring device for thrust of an earth pressure balance shield machine in a shield tunnel according to claim 3 is characterized in that: The grooves (211) are each provided with an elastic filling piece (212), the elastic filling piece (212) being used to provide elastic forces in opposite directions to the inner walls on both sides of the groove (211), the detection end of the first pressure detection unit (22) is provided with a guide seat (23), the guide seat (23) is provided with a slot, and the bending structure (21) is mounted in the slot of the guide seat (23).

5. The intelligent monitoring device for thrust of earth pressure balance shield machine in shield tunnel according to claim 4 is characterized in that: The first pressure member (31) is provided with a movable rod (34), the movable rod (34) slidably penetrates the support plate (122), the first pressure member (31) and the second pressure member (32), the first pressure member (31) is provided with a piston cavity inside, the movable rod (34) is provided with a piston member (35), the piston member (35) is slidably installed in the piston cavity, and an elastic member is provided between the piston member (35) and the first pressure member (31), the elastic member is used to drive the piston member (35) The piston member (35) moves in a direction away from the shoe plate (121), an extrusion plate is provided at the end of the piston member (35), the piston chamber of the first pressure-applying member (31) is connected to the monitoring chamber (124), the monitoring chamber (124) is provided with a through hole connected to the outside, a pressure touch switch (24) is provided in the monitoring chamber (124), the pressure touch switch (24) is used to control the opening and closing of the first pressure detection unit (22), and one end of the movable rod (34) corresponding to the pressure touch switch (24) is set as a pressure touch portion.

6. The intelligent monitoring device for thrust of an earth pressure balance shield machine in a shield tunnel according to claim 5 is characterized in that: A hydraulic monitoring assembly (5) is arranged at the shield tail of the shield machine (1); the hydraulic monitoring assembly (5) is arranged corresponding to the grouting area between the pipe segment and the tunnel wall, and a plurality of groups of the hydraulic monitoring assembly (5) are arranged; a shield tail brush (13) is arranged between the shield tail of the shield machine (1) and the pipe segment; the hydraulic monitoring assembly (5) comprises a fixed seat (51) and a pressure seat (52); the fixed seat (51) is fixedly mounted on the shield tail brush (13); the pressure seat (52) is slidably mounted on the fixed seat (51); and a second pressure detection unit (53) is arranged between the fixed seat (51) and the pressure seat (52).

7. The intelligent monitoring device for thrust of an earth pressure balance shield machine in a shield tunnel according to claim 6 is characterized in that: The outside of the pressure seat (52) is fixedly connected to an outer protective tube (54), the inside of the outer protective tube (54) is fixedly connected to a conical cover (55), and one end of the conical cover (55) away from the outer protective tube (54) is slidably fitted to the outer wall of the fixed seat (51).

8. The monitoring method of the thrust intelligent monitoring device of the shield tunnel earth pressure balance shield machine according to claim 7, characterized in that: The following steps are involved: Step 1: installing the bending structure (21) and the first pressure detection unit (22) in the shoe plate (121), and assembling the shoe plate (121), the support plate (122) and the pad (123) to form an improved support shoe assembly (12); Step 2: Replace and install the improved support shoe assembly (12) on the output end of the propulsion hydraulic cylinder (11), and install the hydraulic monitoring assembly (5) on the shield tail brush (13); Step 3: driving the shield machine (1) to work, and starting the propulsion system of the shield machine (1) to install the segments (4) and propel the shield machine (1); Step 4: Detecting the deformation force of the bending structure (21) when it is subjected to the lateral pressure formed by the thrust force through the first pressure detection unit (22) at each position, and obtaining the lateral pressure borne by the bending structure (21) according to the database of the bending structure (21); Step 5: Calculate the thrust generated by a single set of support shoe assemblies (12) based on the number of thrust monitoring assemblies (2) and the number of bending structures (21), and perform data analysis by the control system of the shield machine (1); Step 6: Detect the slurry pressure at the shield tail through multiple sets of hydraulic monitoring components (5), so as to determine the thrust effect of the slurry on the shield machine body (1); Step 7: The control system of the shield machine (1) performs a comprehensive analysis on the data of the first pressure detection unit (22) and the second pressure detection unit (53), and adjusts the control of the propulsion system of the shield machine (1) according to the data structure.

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