Shield tail brush protection plate all-round partition damage monitoring and early warning system

Abstract

The invention belongs to the technical field of shield tunnel engineering, and particularly relates to a shield tail brush protection plate circumferential partition damage monitoring and early warning system, which is characterized in that each shield tail brush is arranged along the circumferential partition area, and a plurality of groups of fixed value resistors R0 and fixed value resistors R1 are arranged in each area; the number of the fixed-value resistors R0 and the number of the fixed-value resistors R1 are equal to the number of shield tail brushes in the area, the fixed-value resistors R1 are fixed on shield tail brush protection plates, the fixed-value resistors R0 and the fixed-value resistors R1 in each group are firstly connected in parallel, then the parallel resistors in the area are connected in series, and meanwhile, the fixed-value resistors R0 and the fixed-value resistors R1 are connected in series with a low-voltage constant power supply, a switch and an ampere meter. And the abnormality of the shield tail brush protection plate is judged by monitoring the current change in the circuit. According to the scheme, adjustment of actual construction parameters and active replacement of the shield tail brush are guided, the current situation that the damage state of the whole circumference of the shield tail brush cannot be accurately monitored in the prior art is effectively solved, and the method is simple, practical and suitable for industrial popularization.

Description

Technical Field

[0001] The invention belongs to the technical field of shield tunnel engineering, and in particular relates to a full-circumference partition damage monitoring and early warning system for a shield tail brush protection plate. Background Art

[0002] The assembly of the shield tunnel lining is carried out under the protection of the shield machine casing. There is a gap between the shield machine casing and the shield tunnel. In order to prevent soil water in the stratum and the synchronous grouting slurry from entering the shield machine, a shield tail sealing system consisting of multiple shield tail brushes and a shield tail grease chamber is set between the shield machine casing and the shield tunnel lining.

[0003] However, there are many factors that induce damage to the shield tail brush during shield construction, such as the wear of the shield tail brush caused by the friction between the shield tail brush and the pipe segment during long-distance excavation of the shield; the shield posture adjustment induces repeated extrusion and deformation of the shield tail brush; the grouting slurry behind the wall enters the shield tail sealing cavity, causing the shield tail brush wire to become hardened and its elasticity to weaken, accelerating the damage of the shield tail brush; pipe segment fragments and debris enter between the shield tail and the pipe segment, causing damage to the shield tail brush.

[0004] There are many types of shield tail brush damage, including the breakage and falling off of the front protective plate, the falling off of the shield tail brush wires, the curling and deformation of the shield tail brush wires, the deformation and falling off of the rear protective plate, etc. Among them, the falling off of the front protective plate is the most common type of shield tail brush damage, and the breakage and falling off of the front protective plate will further induce deformation and wear of the shield tail brush, which will seriously affect the safety of the shield tail seal.

[0005] To ensure the safety of the shield tail seal, it is necessary to ensure that there is no risk of leakage at all positions around the entire circumference. The decline in sealing performance at any part will directly affect the overall sealing performance of the shield tail brush.

[0006] However, the existing technology lacks effective monitoring means for the wear state of the entire ring of the shield tail brush, resulting in the inability to effectively monitor the wear state of the shield tail brush during the construction period, making the occurrence of shield tail leakage sudden, posing a serious safety hazard to shield construction. In addition, due to the lack of data collection on the damage state of the shield tail brush during shield construction, the analysis of the factors affecting the damage of the shield tail brush and other research work seriously lacks the support of actual engineering data, resulting in the lag of related theoretical research, and the safety of long-distance shield construction cannot be effectively guaranteed.

[0007] The existing technology for monitoring the wear and deterioration of the shield tail brush is mainly aimed at monitoring the local or partial shield tail brushes. For example, patent CN202110437021.X uses the wear part and optical fiber to monitor the wear length of a single shield tail brush protection plate; patent CN202110652127.1 determines whether a single shield tail brush needs to be replaced by whether the conductive line is worn off. The above technologies are all local monitoring and cannot accurately evaluate the overall effect of the shield tail sealing performance. Even if the monitoring data shows that the shield tail brush at this location has not deteriorated or damaged, it does not mean that there is no leakage risk point in the entire shield tail sealing system. Summary of the invention

[0008] In order to solve the above problems, the present invention provides a full-circle zoned damage monitoring and early warning system for the shield tail brush protection plate, which can realize the evaluation and early warning of the damage status of the protection plate in different areas around the shield tail brush, thereby guiding the adjustment of actual construction parameters and the active replacement of the shield tail brush, and can also accumulate actual shield tail brush wear data during shield construction, providing data support for the optimization of the shield tail sealing system of similar projects and the prediction of wear degradation status.

[0009] The technical solution of the present invention is:

[0010] The present invention provides a full-circle partition damage monitoring and early warning system for a shield tail brush protection plate, wherein each shield tail brush is divided into m areas along a circumferential direction, and a plurality of groups of fixed resistors R0 and fixed resistors R1 are arranged in each area, and the number of the fixed resistors R0 and the fixed resistors R1 are equal to the number of the shield tail brushes in the area, wherein the fixed resistor R1 is fixed on the shield tail brush protection plate, and each group of fixed resistors R0 and fixed resistors R1 are first connected in parallel, and then the parallel resistors in the area are connected in series, and at the same time are connected in series with a constant power supply, a switch and an ammeter, and the abnormality of the shield tail brush protection plate is judged by monitoring the change of the current in the circuit.

[0011] Preferably, a slot is reserved on the shield tail brush protection plate to facilitate fixing the fixed value resistor R1 on the shield tail brush protection plate.

[0012] Preferably, when performing regional division, it is ensured that the number of shield tail brushes in each region is similarly distributed, and the difference in the number of shield tail brushes in different regions satisfies:

[0013]

[0014] Among them, n i represents the number of shield tail brushes in the ith region, n j represents the number of shield tail brushes in the jth region, where i≠j and & represents the upper limit of the quantity difference.

[0015] As an alternative, when dividing the area, ensure that the number of shield tail brushes in each area is evenly distributed, that is, n i =n j. Further preferably, the number n of the shield tail brushes in the i-th region i Satisfies the following formula:

[0016]

[0017] Where D in is the inner diameter of the shield shell at the tail, N A is the number of assembly points of the shield lining ring, n i represents the number of shield tail brushes in the ith region, L B is the outer arc length of the standard block of the segment, and W is the width of a single shield tail brush. Further, the current meter monitoring value and the theoretical value in each area are compared to determine whether an abnormality occurs. For the i-th area, if the monitored current value meets the following conditions, it is determined that there is an abnormality in the shield tail brush protection plate in the area:

[0018]

[0019] Among them, I ims represents the current value of the circuit in the ith region, ε represents the allowable deviation of the current, I ims0 Represents the standard current value of the circuit in the ith region, satisfying the following formula:

[0020] Among them, U U0 represents the voltage of the constant power supply U0, R isum represents the theoretical total resistance value of the circuit in the ith region, satisfying the following formula:

[0021]

[0022] n i represents the number of shield tail brushes in the ith region, R R0 Indicates the resistance value of the fixed resistor R0, R R1 Indicates the resistance value of the fixed resistor R1.

[0023] As an alternative, the current meter monitoring value in each area is compared with the average value of the current meter monitoring value in other areas to determine whether an abnormality occurs. For the i-th area, if the monitoring current value meets the following conditions, it is determined that the shield tail brush protection plate in the area is abnormal:

[0024]

[0025] in, Indicates the average value of the current meter monitoring value outside this area.

[0026] Furthermore, when it is determined that there is an abnormality in the shield tail brush protection plate in the i-th area, the number of damaged shield tail brushes is further determined by the current value in the area. The number of damaged shield tail brushes in the i-th area ki The calculation formula is:

[0027]

[0028] Among them, R R0 Indicates the resistance value of the fixed resistor R0, R R1 Indicates the resistance value of the fixed resistor R1, U U0 Indicates the voltage of the constant power supply U0, I ims Indicates the current value of the circuit in the ith region. Further, when it is determined that there is an abnormality in the shield tail brush protection plate in the ith region, based on the number of damaged shield tail brushes k i and the number of shield tail brushes n in the i-th region i Determine the degree of wear of the shield tail brush:

[0029] (1) When 0≤k i / n i <α1, the damage level is judged as level 1, which means slight damage. At this time, α1 represents the upper limit of level 1 damage. During construction, the control of shield tail clearance and grease pressure in this area should be focused on;

[0030] (2) When α1≤k i / n i <α2, the damage level is determined to be level 2, which is moderate damage. At this time, α2 represents the upper limit of level 2 damage. During construction, focus on monitoring the water leakage of the shield tail seal in this area, and pay attention to the control of the shield tail gap and grease pressure in this area;

[0031] (3) When α2≤k i / n i <α3, the damage level is judged as level 3, severe damage, where α3 represents the upper limit of level 3 damage. During construction, the focus is on strengthening the monitoring of shield tail seal water leakage in this area, strengthening the control of shield tail gap and grease pressure in this area, and replacing the shield tail brush in this area when the time is right;

[0032] (4) When α3≤k i / n i <1, the damage level is determined to be level 4, which is extremely severe damage. At this time, it is recommended to immediately carry out the preliminary preparations for replacing the shield tail brush and complete the replacement of the shield tail brush in this area as soon as possible.

[0033] Furthermore, the degradation rate of the shield tail brush in each area is monitored. If the degradation rate of the shield tail brush is too fast, it means that the shield construction parameter values ​​are unfavorable or other unfavorable accidental factors occur. When the shield tail brush in the i-th area meets the following conditions, it is determined that the degradation rate of the shield tail brush is too fast:

[0034]

[0035] Among them, △k iIt indicates the increment of the number of deteriorated shield tail brushes in the ith area after 15 rings of shield tunneling. Indicates the upper limit of the shield tail brush degradation rate.

[0036] This technical solution can provide a more effective research solution for the research of shield underground butt joint construction technology. Specifically, compared with the existing technology, it has the following advantages:

[0037] In order to solve the above problems, the present invention provides a full-circle zoned damage monitoring and early warning system for the shield tail brush protection plate, which can realize the evaluation and early warning of the damage status of the protection plate in different areas around the shield tail brush, thereby guiding the adjustment of actual construction parameters and the active replacement of the shield tail brush, and can also accumulate actual shield tail brush wear data during shield construction, providing data support for the optimization of the shield tail sealing system of similar projects and the prediction of wear degradation status.

[0038] 1. The present invention creatively proposes a method of installing a resistor on the shield tail brush protection plate, and designs a corresponding circuit. The resistor circuit is used to monitor the wear and fracture of the shield tail brush protection plate. The monitoring principle is clear and direct, the data is highly timely and accurate;

[0039] 2. The present invention provides a variety of early warning methods, which can determine whether the shield tail brush is abnormal, and also provide the damage level of the shield tail brush in the entire circumference. At the same time, it also provides a judgment method for the deterioration rate of the shield tail brush for early warning, and provides targeted construction control measures, which is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the shield tail brush partition;

[0041] Figure 2 It is a schematic diagram of the initial state of each partition circuit;

[0042] Figure 3 This is a schematic diagram of the circuit status after the shield tail brush protection plate of each partition is broken;

[0043] Figure 4 This is a schematic diagram of the panel interface that displays the wear status of the shield tail brush protection plate. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples:

[0045] To ensure the safety of the shield tail seal, it is necessary to ensure that there is no risk of leakage at all positions around the entire circumference. The decline in sealing performance at any part will directly affect the overall sealing performance of the shield tail brush.

[0046] Among them, the falling off of the front protective plate is the most common type of damage to the shield tail brush, and the breaking and falling off of the front protective plate will further induce deformation and wear of the shield tail brush, which will seriously affect the safety of the shield tail seal.

[0047] Therefore, the scheme of the present invention is designed to provide a full-circle partition damage monitoring and early warning system for the shield tail brush protection plate, by setting each shield tail brush along the annular area, and setting multiple groups of fixed resistors R0 and fixed resistors R1 in each area, the number of fixed resistors R0 and fixed resistors R1 are equal to the number of shield tail brushes in the area, wherein the fixed resistor R1 is fixed on the shield tail brush protection plate, each group of fixed resistors R0 and fixed resistors R1 are first connected in parallel, and then the parallel resistors in the area are connected in series, and at the same time connected in series with a low-voltage constant power supply, a switch and an ammeter, and the abnormality of the shield tail brush protection plate is judged by monitoring the change of current in the circuit. This scheme guides the adjustment of actual construction parameters and the active replacement of the shield tail brush, effectively solving the current situation of inaccurate local monitoring data in the prior art, is simple and practical, and suitable for industrial promotion.

[0048] Example 1

[0049] The present invention provides a full-circle partition damage monitoring and early warning system for a shield tail brush protection plate, wherein each shield tail brush is divided into m areas along a circumferential direction, and a plurality of groups of fixed resistors R0 and fixed resistors R1 are arranged in each area, and the number of the fixed resistors R0 and the fixed resistors R1 are equal to the number of the shield tail brushes in the area, wherein the fixed resistor R1 is fixed on the shield tail brush protection plate, and each group of fixed resistors R0 and fixed resistors R1 are first connected in parallel, and then the parallel resistors in the area are connected in series, and at the same time are connected in series with a constant power supply, a switch and an ammeter, and the abnormality of the shield tail brush protection plate is judged by monitoring the change of the current in the circuit.

[0050] A single fixed resistor R0 is connected in parallel with a single fixed resistor R1 and then connected in series to the total circuit. The fixed resistor R1 is fixed on the shield tail brush protection plate. The constant power supply U0, fixed resistor R0, switch and other components are set in an area not affected by the construction. The connection between the fixed resistor R1 and the main line is achieved through a quick connector.

[0051] There are K shield tail brushes in total, and the total number of each shield tail brush is N. Each shield tail brush is divided into m areas along the circumferential direction. The number of shield tail brushes in each area is close to n. i (i=1~m).

[0052] If the total number of single-channel shield tail brushes is 96, divided into 16 areas, then m = 16. Figure 1 As shown. Each partition is evenly divided into 6 tail brushes, n i =6, then each partition circuit has 6 sets of fixed resistors R0 and R1 connected in parallel and then connected in series. The circuit is as follows Figure 2 When the tail brush protection plate inside the partition is damaged or broken, the fixed value circuit R1 fixed on it is disconnected from the circuit, a short circuit is formed at the corresponding position, and the current in the circuit changes. Figure 3The protection plates of the two tail brushes are broken, and accordingly the two fixed resistors R1 are short-circuited.

[0053] Preferably, a slot is reserved on the shield tail brush protection plate to facilitate fixing the fixed value resistor R1 on the shield tail brush protection plate.

[0054] The preferred fixed value resistor R0 may be a high temperature resistant carbon film resistor with a resistance of 1000Ω.

[0055] The preferred fixed value resistor R1 may be a high temperature resistant carbon film resistor with a resistance of 250Ω.

[0056] Example 2

[0057] When dividing the area, ensure that the number of shield tail brushes in each area is similar to ensure that the circuit system of each partition is similar. The difference in the number of shield tail brushes in different areas meets the following requirements:

[0058]

[0059] Among them, n i represents the number of shield tail brushes in the ith region, n j represents the number of shield tail brushes in the jth area, where i≠j, and & represents the upper limit of the quantity difference, preferably 15%.

[0060] Preferably, when dividing the regions, ensure that the number of shield tail brushes in each region is evenly distributed, that is, n i =n j .

[0061] Example 3 The number of shield tail brushes n in the i-th area i Satisfies the following formula:

[0062]

[0063] Where D in is the inner diameter of the shield shell at the tail, N A is the number of assembly points of the shield lining ring, n i represents the number of shield tail brushes in the ith region, L B is the outer arc length of the standard segment block, and W is the width of a single shield tail brush. The above formula is helpful to achieve the following effects: by removing a single segment during shield construction, all shield tail brushes in the partition can be inspected and replaced; the number of shield tail partitions is not too large, and the range of a single partition is larger than the range of a single assembly point of the shield lining, which is economical and easy to operate.

[0064] Example 4

[0065] Whether an abnormality occurs can be determined by comparing the current meter monitoring value and the theoretical value in each area. For the i-th area, if the monitored current value meets the following conditions, it is determined that there is an abnormality in the shield tail brush protection plate in the area:

[0066]

[0067] Among them, I ims I represents the current value of the circuit in the ith region, and ε represents the allowable deviation of the current. ε is based on empirical values, preferably 17%. ims0 Represents the standard current value of the circuit in the ith region, satisfying the following formula:

[0068] Among them, U U0 represents the voltage of the constant power supply U0, R isum represents the theoretical total resistance value of the circuit in the ith region, satisfying the following formula:

[0069]

[0070] n i represents the number of shield tail brushes in the ith region, R R0 Indicates the resistance value of the fixed resistor R0, R R1 Indicates the resistance value of the fixed resistor R1.

[0071] Example 5

[0072] The current meter monitoring values ​​in each area are compared with the average values ​​of the current meter monitoring values ​​in other areas to determine whether an abnormality occurs. For the i-th area, if the monitoring current value meets the following conditions, it is determined that there is an abnormality in the shield tail brush protection plate in the area:

[0073]

[0074] in, Indicates the average value of the current meter monitoring value outside this area.

[0075] This embodiment provides another method for determining an abnormality, which can be determined independently or in combination with embodiment 4.

[0076] Example 6

[0077] When the shield tail brush protection plate is worn and falls off, the fixed resistor R1 on it will also fall off, and the resistance value in the circuit will change, thus affecting the current intensity of the circuit. s By measuring the current intensity, the number of damaged shield tail brush protection plates in the area can be inferred. i .

[0078] When it is determined that there is an abnormality in the shield tail brush protection plate in the i-th area, the number of damaged shield tail brushes is determined by the current value in the area. The number of damaged shield tail brushes in the i-th area k i The calculation formula is:

[0079]

[0080] Among them, R R0 Indicates the resistance value of the fixed resistor R0, R R1 Indicates the resistance value of the fixed resistor R1, U U0 Indicates the voltage of the constant power supply U0, I ims represents the current value of the circuit in the i-th region.

[0081] Figure 4 This is a schematic diagram of the damage status display panel interface of the shield tail brush protection plate. The □ shows the value, and the ○ is a light of different colors, corresponding to different damage levels. The deterioration of the shield tail brush in the area is graded and evaluated by the number of damages, and then it is guided whether the shield tail brush should be replaced.

[0082] When it is judged that there is an abnormality in the shield tail brush protection plate in the i-th area, based on the number of shield tail brush damage k i and the number of shield tail brushes n in the i-th region i Determine the degree of wear of the shield tail brush:

[0083] (1) When 0≤k i / n i <α1, the damage level is judged as level 1, which means slight damage. At this time, α1 represents the upper limit of level 1 damage. During construction, the control of shield tail clearance and grease pressure in this area should be focused on;

[0084] (2) When α1≤k i / n i <α2, the damage level is determined to be level 2, which is moderate damage. At this time, α2 represents the upper limit of level 2 damage. During construction, focus on monitoring the water leakage of the shield tail seal in this area, and pay attention to the control of the shield tail gap and grease pressure in this area;

[0085] (3) When α2≤k i / n i <α3, the damage level is judged as level 3, severe damage, where α3 represents the upper limit of level 3 damage. During construction, the focus is on strengthening the monitoring of shield tail seal water leakage in this area, strengthening the control of shield tail gap and grease pressure in this area, and replacing the shield tail brush in this area when the time is right;

[0086] (4) When α3≤k i / n i<1, the damage level is determined to be level 4, which is extremely severe damage. At this time, it is recommended to immediately carry out the preliminary preparations for replacing the shield tail brush and complete the replacement of the shield tail brush in this area as soon as possible.

[0087] Among them, the preferred values ​​of α1, α2 and α3 are 0.25, 0.5 and 0.75 based on industry experience.

[0088] Example 8

[0089] Monitor the deterioration rate of the shield tail brush in each area. If the deterioration rate of the shield tail brush is too fast, it means that the shield construction parameters are unfavorable or other unfavorable accidental factors occur. When the shield tail brush in the i-th area meets the following conditions, it is determined that the deterioration rate of the shield tail brush is too fast:

[0090]

[0091] Among them, △k i It indicates the increment of the number of deteriorated shield tail brushes in the ith area after 15 rings of shield tunneling. Indicates the upper limit of the shield tail brush degradation rate. Preferred is 0.1.

[0092] At this time, the reasons for the rapid deterioration rate of the shield tail brush should be analyzed in combination with the shield construction parameters, and the construction parameters should be adjusted in time to maintain continuous attention to the deterioration status of the shield tail brush in this area. If the deterioration rate of the shield tail brush drops to a normal level, the adjusted construction parameters should be maintained, and then the degradation degree indicators of the shield tail brush in each partition should be used for judgment.

[0093] The content of the present invention has been described in detail through the above preferred embodiments, but it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be obvious to those skilled in the art for various modifications and substitutions of the present invention. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A full-circle partition damage monitoring and early warning system for a shield tail brush protection plate, characterized in that: Each shield tail brush is divided into m areas along the circumferential direction, and multiple groups of fixed resistors R0 and fixed resistors R1 are arranged in each area. The number of fixed resistors R0 and fixed resistors R1 is equal to the number of shield tail brushes in the area. Among them, the fixed resistor R1 is fixed on the shield tail brush protection board. Each group of fixed resistors R0 and fixed resistors R1 are first connected in parallel, and then the parallel resistors in the area are connected in series, and at the same time connected in series with a constant power supply, a switch and an ammeter. The abnormality of the shield tail brush protection board is judged by monitoring the change of current in the circuit.

2. According to claim 1, a shield tail brush protection plate full circumference partition damage monitoring and early warning system is characterized in that: A slot is reserved on the shield tail brush protection board to facilitate fixing the fixed value resistor R1 on the shield tail brush protection board.

3. The shield tail brush protection plate full circumference partition damage monitoring and early warning system according to claim 1 is characterized by: When dividing the regions, ensure that the number of shield tail brushes in each region is similar, and the difference in the number of shield tail brushes in different regions meets the following requirements: Among them, n i represents the number of shield tail brushes in the ith region, n j represents the number of shield tail brushes in the jth region, where i≠j and & represents the upper limit of the quantity difference.

4. The shield tail brush protection plate full circumference partition damage monitoring and early warning system according to claim 1 is characterized by: When dividing the area, ensure that the number of shield tail brushes in each area is evenly distributed, that is, n i =n j .

5. The shield tail brush protection plate full circumference partition damage monitoring and early warning system according to claim 1 is characterized by: The number of tail brushes in the ith region n i Satisfies the following formula: Where D in is the inner diameter of the shield shell at the tail, N A is the number of assembly points of the shield lining ring, n i represents the number of shield tail brushes in the ith region, L B is the outer arc length of the standard segment block, and W is the width of a single shield tail brush.

6. The shield tail brush protection plate full circumference partition damage monitoring and early warning system according to claim 1 is characterized by: Compare the current meter monitoring value and theoretical value in each area to determine whether an abnormality occurs. For the i-th area, if the monitored current value meets the following conditions, it is determined that there is an abnormality in the shield tail brush protection plate in the area: Among them, I ims represents the current value of the circuit in the ith region, ε represents the allowable deviation of the current, I ims0 Represents the standard current value of the circuit in the ith region, satisfying the following formula: Among them, U U0 represents the voltage of the constant power supply U0, R isum represents the theoretical total resistance value of the circuit in the ith region, satisfying the following formula: n i represents the number of shield tail brushes in the ith region, R R0 Indicates the resistance value of the fixed resistor R0, R R1 Indicates the resistance value of the fixed resistor R1.

7. The shield tail brush protection plate full circumference partition damage monitoring and early warning system according to claim 1 is characterized by: The current meter monitoring values ​​in each area are compared with the average values ​​of the current meter monitoring values ​​in other areas to determine whether an abnormality occurs. For the i-th area, if the monitoring current value meets the following conditions, it is determined that there is an abnormality in the shield tail brush protection plate in the area: in, Indicates the average value of the current meter monitoring value outside this area.

8. The shield tail brush protection plate full circumference partition damage monitoring and early warning system according to claim 1 is characterized by: When it is determined that there is an abnormality in the shield tail brush protection plate in the i-th area, the number of damaged shield tail brushes is determined by the current value in the area. The number of damaged shield tail brushes in the i-th area k i The calculation formula is:

9. Among them, R R0 Indicates the resistance value of the fixed resistor R0, R R1 Indicates the resistance value of the fixed resistor R1, U U0 Indicates the voltage of the constant power supply U0, I ims Represents the current value of the circuit in the i-th region. The shield tail brush protection plate full circumference partition damage monitoring and early warning system according to claim 8 is characterized in that: When it is judged that there is an abnormality in the shield tail brush protection plate in the i-th area, based on the number of shield tail brush damage k i and the number of shield tail brushes n in the i-th region i Determine the degree of wear of the shield tail brush: (1) When 0≤k i / n i <α1, the damage level is judged as level 1, which means slight damage. At this time, α1 represents the upper limit of level 1 damage. During construction, the control of shield tail clearance and grease pressure in this area should be focused on; (2) When α1≤k i / n i <α2, the damage level is determined to be level 2, which is moderate damage. At this time, α2 represents the upper limit of level 2 damage. During construction, focus on monitoring the water leakage of the shield tail seal in this area, and pay attention to the control of the shield tail gap and grease pressure in this area; (3) When α2≤k i / n i <α3, the damage level is judged as level 3, severe damage, where α3 represents the upper limit of level 3 damage. During construction, the focus is on strengthening the monitoring of shield tail seal water leakage in this area, strengthening the control of shield tail gap and grease pressure in this area, and replacing the shield tail brush in this area when the time is right; (4) When α3≤k i / n i <1, the damage level is determined to be level 4, which is extremely severe damage. At this time, it is recommended to immediately carry out the preliminary preparations for replacing the shield tail brush and complete the replacement of the shield tail brush in this area as soon as possible.

10. The shield tail brush protection plate full circumference partition damage monitoring and early warning system according to claim 8, characterized in that: Monitor the deterioration rate of the shield tail brush in each area. If the deterioration rate of the shield tail brush is too fast, it means that the shield construction parameters are unfavorable or other unfavorable accidental factors occur. When the shield tail brush in the i-th area meets the following conditions, it is determined that the deterioration rate of the shield tail brush is too fast: Among them, △k i It indicates the increment of the number of deteriorated shield tail brushes in the ith area after 15 rings of shield tunneling. Indicates the upper limit of the shield tail brush degradation rate.

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