Method for replacing shield tail brush of shield tunnel by adopting threaded quick connecting piece

Abstract

The invention provides a method for replacing a shield tail brush of a shield tunnel by adopting a threaded quick connecting piece, which comprises the following steps: S1, customizing a single-section threaded screw which comprises a first nut, a first threaded section and a smooth step section, and the first threaded section and the smooth step section are fixedly connected to the two ends of the first nut; s2, after the shield tunneling machine is tunneled to the selected shield tail brush replacement position, the single-section threaded screw is adopted to complete segment assembly; s3, the shield tunneling machine advances by the distance of a ring segment, and the ring segment pressed at the shield tail brush is dismantled in a lossless mode through a segment erector; s4, a shield tail brush is replaced; and S5, the pipe piece is reassembled through a double-section threaded screw. Through double innovation of a special screw rod structure and a staged connecting process, the technical bottleneck of irreversible installation of a threaded connecting piece is broken through, and high efficiency, economical efficiency and safety of replacement of the shield tail brush are achieved on the premise that the structural performance is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of shield tunnel construction, and in particular to a method for replacing a shield tail brush of a shield tunnel using a threaded quick connector. Background Art

[0002] In shield construction, threaded quick connectors are widely used due to their advantages such as reliable connection and convenient construction. These connectors mainly include embedded nuts and screws, and the tensile strength is achieved by thread engagement. However, threaded quick connectors in the prior art have significant drawbacks:

[0003] Irreversibility: If the segments need to be removed after installation, the screws need to be pulled out forcefully, which will damage the threads and make them unreusable, affecting the bearing capacity of the structure.

[0004] Limited maintenance: Replacing the tail brush requires removing the pipe segments, but the existing connection method requires the removal of damaged parts, which increases maintenance costs and construction time, restricting the promotion and application of this connector.

[0005] At present, there is no technical solution for the non-destructive removal of threaded quick connectors in shield tunnel construction. There is an urgent need for a method that can both ensure connection performance and realize repeated disassembly of segments. Summary of the Invention

[0006] In view of the above, the present invention provides a method for replacing the tail brush of a shield tunnel using a threaded quick connector to solve the problem that the pipe segments cannot be removed non-destructively when replacing the shield brush during the construction of a shield tunnel using conventional threaded connectors.

[0007] The technical solution adopted in the present invention is:

[0008] The present invention provides a method for replacing a shield tail brush of a shield tunnel using a threaded quick connector, which is characterized by comprising the following steps:

[0009] Step S1: Customizing a single-stage threaded screw, the single-stage threaded screw comprising a first nut and a first threaded segment fixedly connected to both ends of the first nut and a smooth platform segment;

[0010] Step S2: After the shield machine excavates to the selected position for replacing the shield tail brush, the single-stage threaded screw is used to complete the segment assembly;

[0011] Step S3: The shield machine advances one ring of segments, and the ring of segments pressed on the shield tail brush is removed without damage using a segment assembly machine;

[0012] Step S4: Replace the shield tail brush;

[0013] Step S5: Reinstall the pipe segments using a double-stage threaded screw.

[0014] Furthermore, the double-stage threaded screw includes a second nut and a second threaded segment and a third threaded segment fixedly connected to both ends of the second nut.

[0015] Furthermore, after replacement, the shield tail brush is filled with shield tail grease, and the pipe segment is reassembled using the double-section threaded screw to achieve lossless pipe segment connection and replacement of the shield tail brush.

[0016] Furthermore, the step S2 includes:

[0017] S2.1: After the shield machine has advanced to the selected shield tail brush replacement position, screw the first threaded section of the single-segment threaded screw into the first embedded nut embedded in the end face of the segment to be assembled;

[0018] S2.2: The segment assembly machine grabs the segment to be assembled, aligns the smooth platform of the single-stage threaded screw with the embedded sleeve embedded in the end face of the assembled segment, and then the shield machine jack is pressed against the jack face to press the smooth platform on the segment to be assembled into the embedded sleeve of the assembled segment. The first nut is embedded in the countersunk hole of the two segments installed tightly together, and the assembly of the entire ring of segments is completed in this order.

[0019] Furthermore, a stepped hole adapted to the smooth platform step is provided in the embedded sleeve.

[0020] Furthermore, in step S3, the non-destructive removal of the looped segments pressed on the shield tail brushes by using the segment assembly machine includes:

[0021] Use the segment assembly machine to grab the capping block of the lining segment to be removed, and move it longitudinally along the tunnel centerline to remove the capping block segment;

[0022] Remove the remaining segments in the order of "capping block first, then segments" to avoid stress concentration.

[0023] Furthermore, the step S4 includes:

[0024] S4.1: Use a wrench to remove the fixing bolts of the old shield tail brush, and check whether the shield tail brush seat is damaged, and clean the rust and debris on the brush seat surface;

[0025] S4.2: Check the wear of the shield tail and polish or repair it if necessary. Clean the soil and sand inside and around the shield tail to ensure it is clean and free of debris.

[0026] S4.3: Align the new shield tail brush with the shield tail brush holder to ensure the correct position. Fix the new shield tail brush to the shield tail brush holder with bolts and tighten the bolts with a wrench. Check whether the new shield tail brush is firmly installed and ensure there is no offset.

[0027] Furthermore, the step S5 includes:

[0028] S5.1: Fill the replaced shield tail brush with grease to ensure the sealing effect;

[0029] S5.2: Remove the single-stage threaded screw and replace it with the double-stage threaded screw to complete the assembly of the entire ring of pipe segments.

[0030] Furthermore, S5.2 includes: screwing the second threaded section of the double-stage threaded screw into the second embedded nut embedded in the end face of the segment to be installed, and then the shield machine jack is pressed against the jack face, and the third threaded section on the segment to be assembled is pressed into the third embedded nut of the assembled segment, and the assembly of the entire ring of segments is completed in this order, the connection strength of the segments is restored, and the shield tail brush is replaced without damage to the segment connection.

[0031] Furthermore, the second nut is embedded in the countersunk holes of the two closely mounted pipe segments.

[0032] The present invention provides a method for replacing the shield tail brush of a shield tunnel without damaging the segment connection based on a single-stage / double-stage threaded screw combination. Through structural innovation and process optimization, the reliability and economy of shield construction and maintenance are significantly improved. The specific beneficial effects are as follows:

[0033] 1. A breakthrough solution to the problem of removing damaged threaded connectors, achieving non-destructive disassembly of pipe segments

[0034] Single-side non-threaded structure design: Through the clearance fit between the smooth platform stage (non-threaded) of the single-stage threaded screw and the embedded sleeve (non-threaded engagement), the pipe segments can be separated by only longitudinal translation, avoiding damage such as screw deformation and nut stripping caused by forced extraction of traditional threads. It ensures the integrity of basic components such as the embedded sleeve and the first embedded nut, laying the foundation for the reuse of pipe segments.

[0035] Stress-controlled demolition process: Adopting the sequence of "capping blocks first, then segments" and the longitudinal translation demolition path, this method avoids the radial stress impact during traditional demolition, further reduces the risk of segment joint damage, and improves structural safety.

[0036] 2. Innovative screw combination system ensures reliable connection performance throughout the entire process

[0037] Staged screw adaptation:

[0038] Assembly stage: The first threaded section 12 of the single-stage threaded screw forms a reliable threaded connection with the first embedded nut to ensure the initial bearing capacity during segment assembly; in the smooth platform stage, rapid positioning is achieved through mechanical embedding (non-threaded force), taking into account both connection strength and later disassembly.

[0039] Reinstallation stage: The second and third thread segments of the double-stage threaded screw respectively form full thread engagement with the second and third embedded nuts, restoring the complete tensile strength performance of the traditional threaded connector and ensuring the structural safety of the tunnel during operation.

[0040] Nut embedding design: The first nut and the second nut are embedded in the countersunk hole of the pipe segment to form a plane contact force transmission, avoiding the stress concentration caused by the traditional screw protruding from the pipe segment surface, and improving the integrity of the joint.

[0041] 3. Significantly improve the efficiency of shield tail brush replacement and reduce maintenance costs

[0042] Fast assembly and disassembly process: The press-in assembly and thread-free dismantling process in the smooth platform stage shortens the assembly and disassembly time of single-ring segments by about 50%, significantly shortens the shield downtime for maintenance, and reduces the risk of construction delays.

[0043] Reduction of material loss: By avoiding the one-time scrapping of screws and nuts due to thread damage in traditional processes, single-ring segment maintenance can save about 30%-50% of the material cost of connectors, which is especially suitable for multiple maintenance scenarios in long tunnels.

[0044] 4. Expand the application scenarios of threaded connectors and promote construction technology innovation

[0045] Versatility in assembly inspection: The non-destructive assembly and disassembly characteristics of the single-stage threaded screw can be directly applied to the three-ring horizontal assembly inspection of the lining segments, avoiding thread wear caused by repeated disassembly and assembly in traditional inspections, reducing trial assembly losses, and improving the economy of prefabricated segment quality inspections.

[0046] Perfection of the technical system: It fills the technical gap in the field of "repeatable disassembly and maintenance" of threaded quick connectors, forms a full-process technical solution of "assembly-maintenance-reassembly", enhances the applicability of such connectors in complex geological conditions and high maintenance demand scenarios, and helps the independence and standardization of the domestic shield equipment technology system.

[0047] 5. Multiple process guarantees to improve tunnel sealing and long-term performance

[0048] Quality control of shield tail brush replacement: Use a torque wrench to precisely control the removal of old brushes and installation of new brushes. Combined with shield tail wear detection, impurity cleaning, and full grease injection processes, this ensures the reliability of the sealing system and reduces the risk of tunnel water leakage.

[0049] Improved construction safety: Standardized demolition sequences and mechanically assisted operations (segment assembly machines) reduce manual intervention and avoid potential safety hazards such as segment breakage and bolt flying caused by traditional forceful demolition, meeting the safety and environmental protection requirements of modern tunnel construction.

[0050] Through the dual innovation of "special screw structure + staged connection process", the present invention breaks through the technical bottleneck of "irreversible installation" of threaded connectors, and realizes the high efficiency, economy and safety of shield tail brush replacement while ensuring structural performance. It has both engineering practical value and the role of promoting industry technology upgrading, and has significant social and economic benefits and market promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but should not be construed as limiting the present invention. In the accompanying drawings:

[0052] Figure 1 : A cross-sectional view of a single-stage threaded screw according to the present invention;

[0053] Figure 2 : A cross-sectional view of a double-stage threaded screw according to the present invention;

[0054] Figure 3 : The present invention adopts the pipe segment installation structure diagram of the shield tail brush replacement method of the shield tunnel using a threaded quick connector.

[0055] Figure numbers: single-stage threaded screw 1, first nut 11, first thread segment 12, smooth platform stage 13, pipe segment 2, first embedded nut 3, embedded sleeve 4, double-stage threaded screw 5, second nut 51, second thread segment 52, third thread segment 53, second embedded nut 6, third embedded nut 7. DETAILED DESCRIPTION

[0056] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0057] like Figures 1 to 3 As shown, the present invention provides a method for replacing a shield tail brush of a shield tunnel using a threaded quick connector, comprising the following steps:

[0058] Step S1: Customizing a single-stage threaded screw 1: The single-stage threaded screw 1 includes a first nut 11, a first threaded segment 12 fixedly connected to both ends of the first nut 11, and a smooth platform segment 13 (without thread);

[0059] Step S2: Assembling the segment 2 using the single-stage threaded screw 1: After the shield machine advances to the selected position for replacing the shield tail brush, the segment 2 is assembled using the single-stage threaded screw 1;

[0060] S2.1: After the shield tunneling machine has reached the selected shield tail brush replacement position, screw the first threaded segment 12 of the single-segment threaded screw 1 into the first embedded nut 3 embedded in the end face of the segment 2 to be assembled;

[0061] S2.2: The segment assembly machine grabs the segment 2 to be assembled and aligns the smooth step 13 of the single-stage threaded screw 1 with the embedded sleeve 4 embedded in the end face of the assembled segment 2. The shield machine jack then presses the smooth step 13 on the segment 2 to be assembled into the embedded sleeve 4 of the assembled segment 2. The first nut 11 is inserted into the countersunk hole of the two closely mounted segments 2. The entire ring of segments is assembled in this order. The embedded sleeve 4 is provided with a stepped hole that matches the smooth step 13.

[0062] Step S3: The shield machine advances one ring of segments, and the segment assembly machine is used to remove the ring of segments pressed on the shield tail brush without damage:

[0063] S3.1: The distance the shield machine advances one ring of segments;

[0064] S3.2: Use the segment assembly machine to grab the capping block of the lining segment to be removed and move it longitudinally along the tunnel centerline to remove the capping block segment;

[0065] S3.3: Remove the remaining segments 2 in the order of "capping block first, then segments" to avoid stress concentration.

[0066] Step S4: Replace the shield tail brush;

[0067] S4.1: Use a wrench to remove the fixing bolts of the old shield tail brush, and check whether the shield tail brush seat is damaged, and clean the rust and debris on the brush seat surface;

[0068] S4.2: Check the wear of the shield tail and polish or repair it if necessary. Clean the soil and sand inside and around the shield tail to ensure it is clean and free of debris.

[0069] S4.3: Align the new shield tail brush with the shield tail brush holder to ensure the correct position. Fix the new shield tail brush to the shield tail brush holder with bolts and tighten the bolts with a wrench. Check whether the new shield tail brush is firmly installed and ensure there is no offset.

[0070] Step S5: Using a double-segment threaded screw 5 to reassemble the pipe segment 2: The double-segment threaded screw 5 includes a second nut 51 and a second threaded segment 52 and a third threaded segment 53 fixedly connected to both ends of the second nut 51; the shield tail brush after replacement is filled with shield tail grease, and the double-segment threaded screw 5 is used to reassemble the pipe segment, achieving damage-free pipe segment connection and replacement of the shield tail brush;

[0071] S5.1: Fill the replaced shield tail brush with grease to ensure the sealing effect.

[0072] S5.2: Remove the single-stage threaded screw 1 and replace it with a double-stage threaded screw 5. Screw the second threaded section 52 of the double-stage threaded screw 5 into the second embedded nut 6 embedded in the end face of the pipe segment 2 to be installed. Then, the shield machine jack is placed on the jack face, and the third threaded section 53 on the pipe segment 2 to be assembled is pressed into the third embedded nut 7 of the assembled pipe segment 2. The second nut 51 is embedded in the countersunk hole of the two pipe segments 2 installed tightly together. In this order, the assembly of the entire ring of pipe segments is completed, the connection strength of the pipe segments is restored, and the shield tail brush is replaced without damage to the pipe segment connection.

[0073] The present invention provides a method for replacing the shield tail brush of a shield tunnel without damaging the segment connection based on a single-stage / double-stage threaded screw combination. Through structural innovation and process optimization, the reliability and economy of shield construction and maintenance are significantly improved. The specific beneficial effects are as follows:

[0074] 1. A breakthrough solution to the problem of removing damaged threaded connectors, achieving non-destructive disassembly of pipe segments

[0075] Single-side non-threaded structure design: Through the clearance fit (non-threaded engagement) between the smooth platform stage 13 (non-threaded) of the single-stage threaded screw 1 and the embedded sleeve 4, the pipe segment can be separated by only longitudinal translation, avoiding damage such as screw deformation and nut stripping caused by forced extraction of traditional threads, ensuring the integrity of basic components such as the embedded sleeve 4 and the first embedded nut 3, and laying the foundation for the reuse of pipe segments.

[0076] Stress-controlled demolition process: Adopting the sequence of "capping blocks first, then segments" and the longitudinal translation demolition path, this method avoids the radial stress impact during traditional demolition, further reduces the risk of segment joint damage, and improves structural safety.

[0077] 2. Innovative screw combination system ensures reliable connection performance throughout the entire process

[0078] Staged screw adaptation:

[0079] Assembly stage: The first threaded section 12 of the single-stage threaded screw 1 forms a reliable threaded connection with the first embedded nut 3 to ensure the initial bearing capacity during segment assembly; the smooth platform stage 13 achieves rapid positioning through mechanical embedding (non-threaded force), taking into account both connection strength and later disassembly.

[0080] During the reassembly phase, the second threaded segment 52 and the third threaded segment 53 of the double-stage threaded screw 5 respectively form full thread engagement with the second embedded nut 6 and the third embedded nut 7, thereby restoring the complete tensile strength performance of the traditional threaded connector and ensuring the structural safety during the tunnel operation phase.

[0081] Nut embedding design: The first nut 11 and the second nut 51 are embedded in the countersunk holes of the pipe segment to form a plane contact force transmission, avoiding the stress concentration caused by the traditional screw protruding from the surface of the pipe segment and improving the integrity of the joint.

[0082] 3. Significantly improve the efficiency of shield tail brush replacement and reduce maintenance costs

[0083] Fast assembly and disassembly process: The press-in assembly and thread-free removal process of the smooth platform stage 13 shortens the assembly and disassembly time of single-ring segments by approximately 50%, significantly shortening the shield downtime for maintenance and reducing the risk of construction delays.

[0084] Reduction of material loss: By avoiding the one-time scrapping of screws and nuts due to thread damage in traditional processes, single-ring segment maintenance can save about 30%-50% of the material cost of connectors, which is especially suitable for multiple maintenance scenarios in long tunnels.

[0085] 4. Expand the application scenarios of threaded connectors and promote construction technology innovation

[0086] Versatility of assembly inspection: The non-destructive disassembly and assembly characteristics of the single-stage threaded screw 1 can be directly applied to the three-ring horizontal assembly inspection of the lining segment, avoiding thread wear caused by repeated disassembly and assembly in traditional inspections, reducing trial assembly losses, and improving the economy of prefabricated segment quality inspections.

[0087] Perfection of the technical system: It fills the technical gap in the field of "repeatable disassembly and maintenance" of threaded quick connectors, forms a full-process technical solution of "assembly-maintenance-reassembly", enhances the applicability of such connectors in complex geological conditions and high maintenance demand scenarios, and helps the independence and standardization of the domestic shield equipment technology system.

[0088] 5. Multiple process guarantees to improve tunnel sealing and long-term performance

[0089] Quality control of shield tail brush replacement: Use a torque wrench to precisely control the removal of old brushes and installation of new brushes. Combined with shield tail wear detection, impurity cleaning, and full grease injection processes, this ensures the reliability of the sealing system and reduces the risk of tunnel water leakage.

[0090] Improved construction safety: Standardized demolition sequences and mechanically assisted operations (segment assembly machines) reduce manual intervention and avoid potential safety hazards such as segment breakage and bolt flying caused by traditional forceful demolition, meeting the safety and environmental protection requirements of modern tunnel construction.

[0091] Through the dual innovation of "special screw structure + staged connection process", the present invention breaks through the technical bottleneck of "irreversible installation" of threaded connectors, and realizes the high efficiency, economy and safety of shield tail brush replacement while ensuring structural performance. It has both engineering practical value and the role of promoting industry technology upgrading, and has significant social and economic benefits and market promotion prospects.

[0092] As long as it does not violate the creative ideas of the present invention, any combination of various different embodiments of the present invention should be regarded as the content disclosed by the present invention; within the technical concept of the present invention, any simple modifications of the technical solution and any combination of different embodiments that do not violate the creative ideas of the present invention should be within the protection scope of the present invention.

Claims

1. A method for replacing the tail brush of a shield tunnel using a threaded quick connector, characterized in that: The following steps are involved: Step S1: Customizing a single-stage threaded screw (1), wherein the single-stage threaded screw (1) comprises a first nut (11), a first threaded section (12) fixedly connected to both ends of the first nut (11), and a smooth platform section (13); Step S2: After the shield machine has advanced to the selected position for replacing the shield tail brush, the single-stage threaded screw (1) is used to complete the assembly of the segments (2); Step S3: The shield machine advances one ring of segments, and the ring of segments pressed on the shield tail brush is removed without damage using a segment assembly machine; Step S4: Replace the shield tail brush; Step S5: using a double-stage threaded screw (5) to reinstall the tube segment (2).

2. The method for replacing the shield tail brush of a shield tunnel using a threaded quick connector according to claim 1 is characterized in that: The double-stage threaded screw (5) comprises a second nut (51) and a second threaded section (52) and a third threaded section (53) fixedly connected to both ends of the second nut (51).

3. The method for replacing the shield tail brush of a shield tunnel using a threaded quick connector according to claim 1, characterized in that: After the replacement, the tail brush of the shield is filled with shield tail grease, and the pipe segment (2) is reassembled using the double-section threaded screw (5), so as to achieve damage-free pipe segment connection and replacement of the tail brush of the shield.

4. The method for replacing the shield tail brush of a shield tunnel using a threaded quick connector according to claim 1, characterized in that: The step S2 comprises: S2.1: After the shield machine has advanced to the selected shield tail brush replacement position, the first threaded section (12) of the single-segment threaded screw (1) is screwed into the first embedded nut (3) embedded in the end face of the segment (2) to be assembled; S2.2: The segment assembly machine grabs the segment to be assembled (2), aligns the smooth platform stage (13) of the single-stage threaded screw (1) with the embedded sleeve (4) embedded in the end face of the assembled segment (2), and then the shield machine jack is pressed against the jack face to press the smooth platform stage (13) on the segment to be assembled (2) into the embedded sleeve (4) of the assembled segment (2), and the first nut (11) is embedded in the countersunk holes of the two segments (2) installed tightly together, and the assembly of the entire ring of segments is completed in this order.

5. The method for replacing the shield tail brush of a shield tunnel using a threaded quick connector according to claim 4, characterized in that: The embedded sleeve (4) is provided with a stepped hole adapted to the smooth platform stage (13).

6. The method for replacing the shield tail brush of a shield tunnel using a threaded quick connector according to claim 1, characterized in that: In step S3, the segment assembly machine is used to non-destructively remove the ring segments pressed on the shield tail brush, which includes: Use the segment assembly machine to grab the capping block of the lining segment to be removed, and move it longitudinally along the tunnel centerline to remove the capping block segment; The remaining segments (2) are removed in the order of "capping block first, then segments" to avoid stress concentration.

7. The method for replacing the shield tail brush of a shield tunnel using a threaded quick connector according to claim 1, characterized in that: The step S4 comprises: S4.1: Use a wrench to remove the fixing bolts of the old shield tail brush, and check whether the shield tail brush seat is damaged, and clean the rust and debris on the brush seat surface; S4.2: Check the wear of the shield tail and polish or repair it if necessary. Clean the soil and sand inside and around the shield tail to ensure it is clean and free of debris. S4.3: Align the new shield tail brush with the shield tail brush holder to ensure that it is in the correct position. Fix the new shield tail brush to the shield tail brush holder with bolts and tighten the bolts with a wrench. Check whether the new shield tail brush is firmly installed and ensure that there is no offset.

8. The method for replacing the shield tail brush of a shield tunnel using a threaded quick connector according to claim 1, characterized in that: The step S5 comprises: S5.1: Fill the replaced shield tail brush with grease to ensure the sealing effect; S5.2: Remove the single-stage threaded screw (1) and replace it with the double-stage threaded screw (5), completing the assembly of the entire ring of segments.

9. The method for replacing the shield tail brush of a shield tunnel using a threaded quick connector according to claim 8, characterized in that: S5.2 includes: screwing the second threaded section (52) of the double-section threaded screw (5) into the second embedded nut (6) embedded in the end face of the pipe segment (2) to be installed, then pressing the shield machine jack against the jack face, and pressing the third threaded section (53) on the pipe segment (2) to be assembled into the third embedded nut (7) of the assembled pipe segment (2), and completing the assembly of the entire ring of pipe segments in this order, restoring the pipe segment connection strength, and realizing the lossless pipe segment connection and replacement of the shield tail brush.

10. The method for replacing the shield tail brush of a shield tunnel using a threaded quick connector according to claim 9, characterized in that: The second nut (51) is embedded in the countersunk holes of two closely mounted tube segments (2).

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