A method for disassembling a double-shell shield machine in a tunnel

Abstract

The present invention discloses a method for disassembling a double-shell shield machine in a tunnel, which solves the technical problem of the difficulty in disassembling the existing double-shell shield machine. The present invention comprises a supporting system, a screw conveyor, a segment assembly machine, a cross beam, a middle shield rear inner block, a middle shield front inner block, a main drive, a front shield inner block, and a cutter disc after disassembly in sequence. The middle shield rear inner block, the middle shield front inner block, and the front shield inner block are provided with a combination lifting lug and equipped with a special tooling for disassembling the inner block. Each universal lifting tool lifts out each inner block of the shield body through the lifting lug and the combination lifting lug respectively. The combination lifting lug is the rotation center for supporting the rotation of the inner block when lifting the inner block. The present invention changes the current situation of large-scale open flames, cutting off a large number of structural parts, generating a large amount of polluted smoke, and low efficiency and safety during the disassembly process in the tunnel, and realizes safe, efficient and rapid disassembly and assembly, improves the disassembly construction environment in the tunnel, reduces personnel costs and equipment costs, and improves the construction economy.

Description

Technical Field

[0001] The invention relates to the technical field of shield machine disassembly, in particular to a method for disassembling a double-shell shield machine in a tunnel. Background Art

[0002] In recent years, the use of shield machines for underground space construction has become the mainstream, and there are more and more shield machines suitable for different working conditions. With the full development of urban surface structures, there is less and less space available for operation on the ground during underground space development. Due to site restrictions, in order to reduce shaft excavation, obtain better construction economy, or reduce the division of responsibilities for shaft and shield section excavation, and ensure construction safety, more and more projects use shield dismantling in the tunnel without penetration.

[0003] At present, the destructive cutting method is mostly used to dismantle the equipment in the tunnel, which destroys the main structure of the shield and retains the core components. A large number of hot work operations are required in the narrow space of the tunnel, which produces a large amount of smoke that is harmful to human health and a harsh environment. The construction safety is poor, the risk is high, and the efficiency is low. A new shield system is also required for secondary assembly, which is less economical and time-effective.

[0004] To this end, tunnel boring machine manufacturers have developed a double-layer shield machine that can non-destructively disassemble the reusable inner shell in the tunnel to avoid the above problems. For example, the utility model patent with the authorization announcement date of 2019.10.11 and the authorization announcement number of CN209483351U discloses a double-layer shield shell and shield body system that can be disassembled in the tunnel, including a shield body and a crossbeam, the shield body includes a front shield, a front middle shield, a rear middle shield and a rear shield connected in sequence, the front shield includes a front shield shell, a front shield inner block is provided in the front shield shell, and the front shield inner block is connected to the front shield shell through a pull plate and pull block connection mechanism; the front middle shield includes a front middle shield shell, a front middle shield inner block is provided in the front middle shield shell, and the front middle shield inner block is connected to the front middle shield shell through a pull plate and pull block connection mechanism; the rear middle shield includes a rear middle shield shell, a rear middle shield inner block is provided in the rear middle shield shell, and the rear middle shield inner block is connected to the rear middle shield shell through a pull plate and pull block connection mechanism.

[0005] However, the double-shell shield machine not only needs to meet the structural requirements of in-tunnel disassembly in its own structural design, but also requires a complete in-tunnel disassembly method. When the double-shell shield machine equipment reaches the disassembly position, it must not only combine the TBM structural design characteristics and disassembly requirements, but also fully consider the operating method of equipment shutdown to ensure that a good disassembly environment is provided for equipment disassembly when the equipment is shut down; and based on the double-shell shield machine tunnel excavation and construction process, the shield body is subject to complex geological conditions and operations during the excavation process, there is shell deformation, resulting in a certain degree of mismatch between the inner and outer shells, resulting in a certain deformation of the inner shell, and difficulty in disassembling the inner block. Targeted design of tooling and disassembly methods are required to ensure safe and efficient disassembly. Summary of the invention

[0006] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a method for disassembling a double-shell shield machine in a tunnel, which solves the problems that the existing double-shell shield machine lacks a detailed disassembly process and auxiliary methods.

[0007] The technical solution of the present invention is implemented as follows: a method for disassembling a double-shell shield machine in a tunnel, disassembling the rear supporting system, the screw conveyor, the segment assembly machine, the M-beam, the rear inner block of the middle shield, the front inner block of the middle shield, the main drive, the front shield inner block, and the cutter head in sequence.

[0008] During the disassembly process, lifting ears are arranged on each inner block of the shield, the M-shaped beam, the shield shell, the main drive and the cutter head, and the corresponding components are lifted out by using the lifting ears with universal lifting tools.

[0009] The rear inner block of the middle shield, the front inner block of the middle shield and the front inner block of the front shield are provided with combined lifting ears and are equipped with special tooling for disassembling the inner blocks. Each universal lifting tool lifts out each inner block of the shield body through the lifting ears and the combined lifting ears respectively. The combined lifting ears are the rotation center that supports the rotation of the inner block when lifting the inner block.

[0010] When disassembling the M-beam, first remove the connecting bolts and flanges between the middle block of the M-beam and the left block of the M-beam and the right block of the M-beam, then use the jack of the special disassembling tooling of the M-beam to push the middle block of the M-beam out from between the left block of the M-beam and the right block of the M-beam, or use the universal lifting device to pull the middle block of the M-beam out from between the left block of the M-beam and the right block of the M-beam, and then use the universal lifting device connected between the shield shell and the special disassembling tooling of the M-beam or between the shield shell and the middle block of the M-beam to lift the middle block of the M-beam. then, at least two lifting ears are arranged on the horizontal sections of the left block of the M-beam and the right block of the M-beam, and the inner wall of the shield shell is arranged with fixed ears corresponding to the lifting ears on the right block of the M-beam and the left block of the M-beam, respectively, and the universal lifting device is arranged between the lifting ears and the fixed ears, and the right block of the M-beam and the left block of the M-beam are pulled out in turn by the universal lifting device or the right block of the M-beam and the left block of the M-beam are pushed out in turn by the oil cylinder, and then the right block of the M-beam and the left block of the M-beam are transported out of the tunnel in turn by the universal lifting device.

[0011] The inner block at the rear of the middle shield includes a top block, an upper left block, an upper right block, a lower left block and a lower right block; when disassembling the top block of the inner block at the rear of the middle shield, first fix the special tooling for disassembling the inner block on the top block, pull out the top block by means of a universal sling and the special tooling for disassembling the inner block or push it out by means of a jack, and lower the top block by means of a universal sling and transport it out of the hole; when disassembling the upper left block of the inner block at the rear of the middle shield, set the combined lifting lug between the lower left block and the upper left block, set a lifting lug on the upper end and the outer wall of the upper left block, set a fixed lifting lug on the inner wall of the shield shell and the upper right block, pull out the upper left block by means of a universal sling connected between the lifting lug and the fixed lifting lug or push it out by means of a jack, and then use The upper left block is first rotated and laid flat along the combined lifting lug, and then transported to the outside of the cave by the universal lifting device; when disassembling the upper right block of the rear inner block of the middle shield, a combined lifting lug is set between the upper right block and the lower right block, and other methods and steps are the same as those for disassembling the upper left block of the rear inner block of the middle shield; when disassembling the lower left block of the rear inner block of the middle shield, firstly lift the upper end of the lower left block by the universal lifting device, and then gradually lift the lower end of the lower left block, and before the height of the lower end of the lower left block is higher than that of the lower right block, connect the universal lifting device between the outer wall of the lower left block and the inner wall of the shield shell, and then gradually lift the lower left block, lay it flat, and then transport it to the outside of the cave; the method for disassembling the lower right block of the rear inner block of the middle shield is the same as the method for disassembling the lower left block of the rear inner block of the middle shield.

[0012] Furthermore, the combined lifting lug comprises an L-shaped support and a swivel seat rotatably matched with the support, and the lifting lugs at the upper ends of the upper left block and the upper right block are L-shaped.

[0013] Furthermore, the disassembly method of the similar structures in the front inner block of the middle shield, the front inner block of the front shield and the rear inner block of the middle shield is the same.

[0014] Furthermore, after disassembling the M-beam and before disassembling the inner block at the rear of the middle shield, first disassemble the shield platform, support shoes, propulsion system, slewing joint, motor reducer, articulated cylinder and anti-twist block.

[0015] When disassembling the propulsion system, pull out the propulsion system through the universal lifting device connected to the inner block of the shield body, or push the propulsion system out through the jack, and then transport the propulsion system out of the cave; when disassembling the main drive, pull the main drive out of the shield body through the universal lifting device or push the main drive out through the jack, place the main drive on the platform for disassembling the main drive and transport it out of the cave.

[0016] The cutter disc comprises a cutter disc housing, a cutter disc central block is arranged at the center of the cutter disc housing, and a plurality of cutter disc blocks combined into a ring are arranged between the cutter disc housing and the cutter disc central block; when disassembling the cutter disc, first support and fix each cutter disc block by the cutter disc block support, first pull out the cutter disc central block by a universal hoist or push out by a jack, then pull out or push out each cutter disc block, hoist the cutter disc central block and each cutter disc block by the universal hoist and transport them out of the cave; at this point, the whole machine is disassembled.

[0017] The present invention realizes the safe, stable and efficient separation of the inner and outer blocks of the tunnel boring machine during the tunnel excavation process of the tunnel boring machine composed of a layered shield, reduces the workload of the machine dismantling, and improves the safety and efficiency of the machine dismantling. The present invention changes the current situation of large-scale open flames, cutting off a large number of structural parts, generating a large amount of polluting smoke, and low sales and safety during the in-tunnel dismantling process, and realizes safe, efficient and rapid disassembly and assembly, greatly reduces environmental pollution, reduces personnel costs and equipment costs, and improves the economic type of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0019] Figure 1 It is a flow chart of the disassembly process;

[0020] Figure 2 This is a schematic diagram of the whole machine disassembly;

[0021] Figure 3 This is a schematic diagram of disassembling the middle block of the M-beam;

[0022] Figure 4 This is a schematic diagram of dismantling the left block of the M-beam;

[0023] Figure 5 This is a schematic diagram of disassembling the internal equipment;

[0024] Figure 6 This is a schematic diagram of the disassembled propulsion system;

[0025] Figure 7 This is a schematic diagram of disassembling the top part of the inner block at the rear of the middle shield;

[0026] Figure 8 This is a schematic diagram of the process of disassembling the upper left block of the rear inner block of the middle shield;

[0027] Fig. 9 This is a schematic diagram of the process of disassembling the upper right block of the rear inner block of the middle shield;

[0028] Fig.10 This is a schematic diagram of the process of disassembling the lower left block of the rear inner block of the middle shield;

[0029] Fig.11 This is a schematic diagram of the process of disassembling the lower right block of the rear inner block of the middle shield;

[0030] Fig.12 This is a schematic diagram of the process of disassembling the main drive;

[0031] Fig.13 It is the front view of the cutter disc;

[0032] Fig.14 This is a schematic diagram of the process of disassembling the cutter head;

[0033] In the figure: 1. rear supporting system, 2. screw conveyor, 3. segment assembly machine, 4. M-beam, 5. motor reducer, 6. double-layer shield, 7. main drive, 8. cutter disc, 9. top block, 10. upper left block, 11. upper right block, 12. lower left block, 13. lower right block, 14. cutter disc shell, 15. cutter disc center block, 16. cutter disc block, 17. shield shell, 18. propulsion system, 19. universal lifting device, 20. middle block of M-beam, 21. left block of M-beam, 22. right block of M-beam, 23. special disassembly tooling for M-beam, 24. lifting eye, 25. fixed eye, 26. combined eye, 27. platform for disassembling main drive, 28. special tooling for disassembling inner block, 29. tooling for disassembling main drive, 30. cutter disc block support. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] A method for disassembling a double-shell shield machine in a tunnel, such as Figure 2 As shown, the double-shell shield machine includes the following parts: the supporting system 1, the screw conveyor 2, the segment assembly machine 3, the M-beam 4, the disassembled shield platform, the support shoe, the slewing joint, the motor reducer 5, the articulated oil cylinder and the anti-twist block, the propulsion system 18, the middle shield rear inner block, the middle shield front inner block, the main drive 7, the front shield inner block, and the cutter head 8. The middle shield rear inner block, the middle shield front inner block and the front shield inner block are the internal blocks of the double-layer shield shell 6, and each block is connected to the shield shell 17. Figure 3As shown, the rear part of the middle shield includes a top block 9, an upper left block 10, an upper right block 11, a lower left block 12 and a lower right block 13, which are connected by bolts and flanges. The inner block of the rear part of the middle shield, the inner block of the front part of the middle shield and the inner block of the front shield have similar assembly forms.

[0036] like Fig.13 As shown, the cutter disc 8 is a segmented cutter disc, including a cutter disc housing 14 , a cutter disc center segment 15 is disposed at the center of the cutter disc housing 14 , and a plurality of cutter disc segments 16 combined into a ring are disposed between the cutter disc housing 14 and the cutter disc center segment 15 .

[0037] The disassembly process of the double-shell shield machine is as follows: Figure 1 As shown, it includes the supporting system 1, screw conveyor 2, segment assembly machine 3, M-beam 4, disassembled shield platform, support boots, propulsion system 18, slewing joint, motor reducer 5, articulated cylinder and anti-twist block, middle shield rear inner block, middle shield front inner block, main drive 7, front shield inner block, and cutter disc 8 after being disassembled in sequence.

[0038] During the disassembly process, lifting ears are provided on each inner block of the shield, the M-shaped beam, the shield shell 17, the main drive 7 and the cutter head 8, and the corresponding components are lifted out by lifting the lifting ears using the universal lifting tool 19. The middle shield rear inner block, the middle shield front inner block and the front shield inner block are provided with a combined lifting ear 26, and each universal lifting tool 19 lifts out each inner block of the shield through the lifting ear and the combined lifting ear 26, respectively. The combined lifting ear 26 is the rotation center that supports the rotation of the inner block when lifting the inner block.

[0039] During disassembly, the rear supporting system 1 is first dismantled, and the rear supporting system 1 is transported out of the tunnel in batches or together; after the fixed tie rod of the screw conveyor 2 is dismantled, the screw conveyor 2 is dismantled and moved out of the tunnel; the segment assembly machine 3 is dismantled and moved out of the tunnel.

[0040] Then remove the M-beam 4. When disassembling the M-beam 4:

[0041] like Figure 3 As shown, first, the connecting bolts and flanges between the middle block 20 of the M-beam and the left block 21 of the M-beam and the right block 22 of the M-beam are released, and then the middle block 20 of the M-beam is pushed out from between the left block 21 of the M-beam and the right block 22 of the M-beam by the jack of the special disassembly tool 23 of the M-beam, or the middle block 20 of the M-beam is pulled out from between the left block 21 of the M-beam and the right block 22 of the M-beam by the universal hoist, and then the middle block 20 of the M-beam is hoisted out by the universal hoist connected between the shield body shell 17 and the special disassembly tool 23 of the M-beam or between the shield body shell 17 and the middle block 20 of the M-beam and transported outside the cave.

[0042] like Figure 4As shown, at least two lifting ears 24 are then set on the horizontal sections of the left block 21 of the M-beam and the right block 22 of the M-beam, and the inner wall of the shield body shell 17 is set with fixed ears 25 corresponding to the lifting ears 24 on the right block 22 of the M-beam and the left block 21 of the M-beam, respectively, and the universal sling 19 is set between the lifting ears 24 and the fixed ears 25, and the right block 22 of the M-beam and the left block 21 of the M-beam are pulled out in turn by the universal sling or the right block 22 of the M-beam and the left block 21 of the M-beam are pushed out in turn by the oil cylinder, and then the right block 22 of the M-beam and the left block 21 of the M-beam are transported to the outside of the cave in turn by the universal sling.

[0043] Then disassemble the equipment inside the shield, which includes the slewing joint, motor reducer 5, articulated cylinder, anti-twist block and other shield parts. Figure 5 As shown, the equipment in the shield body is pulled out by a universal lifting device 19 or pushed out by a jack, and then transported to the outside of the cave. Figure 6 As shown, the propulsion system 18 is then disassembled, and the universal lifting device 19 pulls out the propulsion system 18 or pushes it out through a jack, and then transports it outside the cave.

[0044] like Figure 7 As shown, then disassemble the inner block at the rear of the shield. Before disassembling the inner block at the rear of the shield, first remove the connection between the inner and outer shells, and then disassemble the connection between the various internal blocks. Figure 7 As shown, when disassembling the top block 9 of the rear inner block of the middle shield, first fix the special tooling 28 for disassembling the inner block on the top block 9, pull out the top block 9 through the universal hoist 19 and the special tooling 28 for disassembling the inner block or push it out through a jack, and then lower the top block 9 through the universal hoist 19 and transport it outside the hole.

[0045] like Figure 8 As shown, when disassembling the upper left block 10 of the rear inner block of the middle shield, the combined lifting ear 26 is set between the lower left block 12 and the upper left block 10, the lifting lug 24 is set at the upper end and outer wall of the upper left block 13, and the fixed lifting lug 25 is set on the inner wall of the shield shell 17 and the upper right block 11. The upper left block 13 is pulled out by the universal lifting device 19 connected between the lifting lug 24 and the fixed lifting lug 25 or pushed out by a jack, and then the upper left block 13 is first rotated and laid flat along the combined lifting lug 26, and then transported to the outside of the hole by the universal lifting device.

[0046] like Fig. 9 As shown, when disassembling the upper right sub-block 11 of the rear inner block of the middle shield, a combined lifting lug 26 is provided between the upper right sub-block 11 and the lower right sub-block 13, and other method steps are the same as those when disassembling the upper left sub-block 10 of the rear inner block of the middle shield.

[0047] like Fig.10As shown, when disassembling the lower left block 12 of the rear inner block of the middle shield, firstly lift the upper end of the lower left block 12 by the universal lifting device 19, and then gradually lift the lower end of the lower left block 12. Before the height of the lower end of the lower left block 12 is higher than the height of the lower right block 13, connect the universal lifting device 19 between the outer wall of the lower left block 12 and the inner wall of the shield shell 17, and then gradually lift the lower left block 12, lay it flat, and then transport it outside the cave. Fig.11 As shown, the method for disassembling the lower right sub-block 13 of the rear inner block of the middle shield is the same as the method for disassembling the lower left sub-block 12 of the rear inner block of the middle shield.

[0048] Furthermore, the combined lifting lug 26 includes an L-shaped support and a swivel seat rotatably matched with the support, and the lifting lugs at the upper ends of the upper left block 10 and the upper right block 11 are L-shaped, which is convenient for installing universal lifting equipment.

[0049] The disassembly method of the similar structures in the front inner block of the middle shield, the front inner block of the front shield and the rear inner block of the middle shield is the same. After the rear inner block of the middle shield and the front inner block of the middle shield are disassembled, the main drive is disassembled. Fig.12 As shown, the main drive 7 is pulled out of the shield body by the universal lifting device 19 or pushed out by the main drive disassembly tool 29, and the main drive 7 is placed on the main drive disassembly platform 27 and transported out of the cave.

[0050] Finally, disassemble the knife disc 8, such as Fig.14 As shown, the cutter disc blocks are first supported and fixed by the cutter disc block support 30, the cutter disc center block 15 is first pulled out or pushed out by the jack through the universal hoist 19, and then the individual cutter disc blocks 16 are pulled out or pushed out, and the cutter disc center block 15 and the individual cutter disc blocks 16 are hoisted out by the universal hoist 19 and transported to the outside of the cave; at this point, the whole machine is disassembled.

[0051] The shield body has several inner blocks connected by block flanges, and the block flanges are connected by bolts to form a complete cylindrical inner shield, which is then matched with the shield shell and formed into a whole by bolt welding and other methods. The inner layer composed of several blocks and the outer shell as a whole ensure the structural strength of the equipment during the excavation process, and the block flanges ensure the detachability of the inner blocks and the feasibility of dismantling in the hole, reducing the economic cost. The inner layer composed of several blocks plays the role of transmitting thrust when the equipment is excavating.

[0052] The details not described in detail in the present invention are all conventional technical means known to those skilled in the art.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for dismantling a double-shell shield machine in a tunnel, characterized in that: Disassemble the rear supporting system, screw conveyor, segment assembly machine, M-beam, middle shield rear inner block, middle shield front inner block, main drive, front shield inner block, and cutter head in sequence; During the disassembly process, lifting lugs for disassembly are set on each inner block, M-beam, shield shell, main drive and cutter head of the shield body. Each inner block is provided with a combined lifting lug, the M-beam is provided with a lifting lug, and the shield shell is provided with a fixed lifting lug. Universal lifting tools are used to lift out the corresponding components. The rear inner block of the middle shield, the front inner block of the middle shield and the front inner block of the front shield are provided with combined lifting ears and equipped with special tooling for disassembling the inner blocks. The universal lifting tool sequentially lifts out the inner blocks of the shield body through the lifting ears and the combined lifting ears provided on the universal lifting tool. The combined lifting ears are the rotation centers that support the rotation of the inner blocks when lifting the inner blocks. When disassembling the M-beam, first remove the connecting bolts and flanges between the middle block of the M-beam and the left block of the M-beam and the right block of the M-beam, then use the jack of the special disassembling tooling of the M-beam to push the middle block of the M-beam out from between the left block of the M-beam and the right block of the M-beam, or use the universal lifting device to pull the middle block of the M-beam out from between the left block of the M-beam and the right block of the M-beam, and then use the universal lifting device connected between the shield shell and the special disassembling tooling of the M-beam or between the shield shell and the middle block of the M-beam to pull the middle block of the M-beam out from between the left block of the M-beam and the right block of the M-beam. After hoisting out, transport it to the outside of the tunnel; then set at least two lifting ears on the horizontal sections of the left block of the M-beam and the right block of the M-beam, set fixed ears corresponding to the lifting ears on the right block of the M-beam and the left block of the M-beam respectively on the inner wall of the shield shell, and set a universal lifting device between the lifting ears and the fixed ears, and pull out the right block of the M-beam and the left block of the M-beam in turn through the universal lifting device or push out the right block of the M-beam and the left block of the M-beam in turn through the oil cylinder, and then transport the right block of the M-beam and the left block of the M-beam in turn to the outside of the tunnel through the universal lifting device.

2. The method for dismantling a double-shell shield machine in a tunnel according to claim 1, characterized in that: The inner block at the rear of the middle shield includes a top block, an upper left block, an upper right block, a lower left block and a lower right block; When disassembling the top block of the inner block at the rear of the middle shield, first fix the special tooling for disassembling the inner block on the top block, pull out the top block through the universal lifting device and the special tooling for disassembling the inner block or push it out through the jack, and then lower the top block through the universal lifting device and transport it outside the hole; When disassembling the upper left block of the inner block at the rear of the middle shield, the combined lifting lug is arranged between the lower left block and the upper left block, a lifting lug is arranged at the upper end and the outer wall of the upper left block, and a fixed lifting lug is arranged on the inner wall of the shield shell and the upper right block, and the upper left block is pulled out by a universal lifting device connected between the lifting lug and the fixed lifting lug or pushed out by a jack, and then the upper left block is first rotated and laid flat along the combined lifting lug, and then transported to the outside of the hole by the universal lifting device; When disassembling the upper right block of the rear inner block of the middle shield, a combined lifting lug is set between the upper right block and the lower right block. The other methods and steps are the same as those for disassembling the upper left block of the rear inner block of the middle shield. When disassembling the lower left block of the rear inner block of the middle shield, firstly lift the upper end of the lower left block with a universal lifting device, and then gradually lift the lower end of the lower left block. Before the height of the lower end of the lower left block is higher than that of the lower right block, connect the universal lifting device between the outer wall of the lower left block and the inner wall of the shield shell, and then gradually lift the lower left block, lay it flat, and then transport it outside the cave. The method for disassembling the lower right block of the rear inner block of the middle shield is the same as the method for disassembling the lower left block of the rear inner block of the middle shield.

3. The method for dismantling a double-shell shield machine in a tunnel according to claim 2, characterized in that: The combined lifting lugs include an L-shaped support and a swivel seat rotatably matched with the support, and the lifting lugs at the upper ends of the upper left block and the upper right block are L-shaped.

4. The method for dismantling a double-shell shield machine in a tunnel according to claim 3, characterized in that: The disassembly method of the similar structures in the front inner block of the middle shield, the front inner block of the shield and the rear inner block of the middle shield is the same.

5. The method for dismantling a double-shell shield machine in a tunnel according to any one of claims 1 to 4, characterized in that: After dismantling the M-beam and before dismantling the inner block at the rear of the middle shield, first dismantle the shield platform, support shoes, propulsion system, slewing joint, motor reducer, articulated cylinder and anti-twist block and other internal components of the shield.

6. The method for dismantling a double-shell shield machine in a tunnel according to claim 5, characterized in that: When disassembling the propulsion cylinder, pull it out by connecting it to the inner block of the shield through a universal lifting device, or push it out by a jack, and then transport it out of the cave; when disassembling the main drive, a guide rod must be set to limit the direction of movement of the main drive.

7. The method for dismantling a double-shell shield machine in a tunnel according to claim 6, characterized in that: Pull the main drive out of the shield body through a universal lifting device or push the main drive out through a jack, place the main drive on a platform for dismantling the main drive and transport it out of the cave.

8. The method for dismantling a double-shell shield machine in a tunnel according to any one of claims 1 to 4, 6 to 7, characterized in that: The cutter disc comprises a cutter disc outer shell, cutter disc inner blocks, and a cutter disc center block. A plurality of cutter disc inner blocks are arranged between the cutter disc outer shell and the cutter disc center block and are combined into a ring. When disassembling the cutter disc, the cutter disc inner blocks are first fixed, and the transition flange between the cutter disc inner blocks and the cutter disc center block is removed to create a gap between the cutter disc inner blocks and the cutter disc center block. Then, the cutter disc center block is first pulled out by a universal hoist or pushed out by a jack, and then each cutter disc block is pulled out or pushed out. The cutter disc center block and each cutter disc block are hoisted out by the universal hoist and transported to the outside of the cave. At this point, the whole machine is disassembled.

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