A construction method for sectional transfer of a shield machine in a confined space

Abstract

The present invention provides a construction method for segmented transfer of a shield machine in a restricted space, belonging to the technical field of tunnel construction; the method includes the following steps: S1, construction preparation, cleaning the translation route between the receiving position of the shield machine and the hoisting opening; S2, fully paving steel plates on the cleaned translation route and setting the receiving base at the receiving position of the shield machine; S3, after the shield machine completes the second operation route, breaking the portal at the end of the second operation route, and moving the shield machine to the receiving base after breaking the portal; S4, disassembling the front shield, middle shield and tail shield of the shield machine; S5, respectively moving the front shield, middle shield and tail shield to the hoisting opening position along the translation route by using hydraulic jacks; S6, successively hoisting the front shield, middle shield and tail shield outside the hoisting opening; compared with the traditional method, this method breaks through the space limitation, improves the construction efficiency, and effectively solves the problem of hoisting out the shield machine in a restricted space.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, and particularly relates to a construction method for segmental transfer of a shield machine in a restricted space. Background Art

[0002] In the booming process of modern urban subway construction, the shield tunneling method is widely used due to its significant advantages such as high efficiency and safety. However, in many actual engineering scenarios, the complex urban environment brings many difficult problems. Especially in the core area of the city, the site location is often in a very busy traffic section, with a large traffic flow and high traffic diversion difficulty. At the same time, the municipal pipelines are crisscrossed, and the relocation work faces huge challenges. In this context, the construction of a shield machine shaft by the cut-and-cover method has become a common solution, but this also causes a series of subsequent construction problems.

[0003] Traditional shield machine receiving methods are mostly designed based on the in-station environment of the cut-and-cover method. When facing the narrow and fully enclosed space of the cut-and-cover station, they seem powerless. After the shield machine completes the excavation of the tunnel and is received, due to the lack of ground construction space, it cannot be guaranteed that the receiving position of the shield machine is the position of the hoisting opening, and the construction space is limited, making it difficult to move the shield machine to the hoisting opening position for hoisting out by using large construction equipment.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above deficiencies in the prior art. Summary of the Invention

[0005] The purpose of the invention is to provide a construction method for segmental transfer of a shield machine in a restricted space to solve the technical problem in the prior art that it is inconvenient to transfer the shield machine due to space constraints.

[0006] To achieve the above purpose, the invention provides the following technical solution for a construction method for segmental transfer of a shield machine in a restricted space:

[0007] A construction method for segmental transfer of a shield machine in a restricted space includes the following steps:

[0008] S1. Construction preparation: Clean the translation route between the receiving position of the shield machine and the hoisting opening. The translation route includes a longitudinal movement path vertically connecting the ends of the first operation route and the second operation route. A transverse movement path extends away from the first operation route at the connection position of the longitudinal movement path and the first operation route. The receiving position of the shield machine is located at one end where the longitudinal movement path is connected to the second operation route, and the hoisting opening is located at one end of the transverse movement path far from the first operation route;

[0009] S2. Fully lay steel plates on the cleaned translation route and set the receiving base at the receiving position of the shield machine;

[0010] S3. After the shield machine completes the second operation route, the portal is demolished at the end of the second operation route. After the shield machine demolishes the portal, it moves to the receiving pedestal.

[0011] S4. Disassemble the front shield, middle shield and tail shield of the shield machine.

[0012] S5. Translate the front shield, middle shield and tail shield respectively along the longitudinal movement path by using hydraulic jacks. After rotating at the intersection of the longitudinal movement path and the transverse movement path, move them along the transverse movement path to the hoisting port position.

[0013] S6. Complete the hoisting of the front shield, middle shield and tail shield in sequence outside the hoisting port.

[0014] As a further optimized technical solution, in S2, the receiving pedestal includes multiple sections of detachable brackets. After the shield machine stops on the receiving pedestal, the front shield, middle shield and tail shield are respectively located on one section of the bracket.

[0015] As a further optimized technical solution, each section of the bracket includes:

[0016] A moving frame body, which includes a support plate arranged at the bottom and a support frame arranged on the top of the support plate for directly supporting the shield machine.

[0017] A connecting structure, which is arranged at the end of the moving frame body and is used to connect adjacent brackets.

[0018] As a further optimized technical solution, the support frame includes support beams arranged at intervals horizontally and support rails arranged on the support beams. There are two groups of support rails arranged symmetrically and are used to jointly support the shield machine.

[0019] As a further optimized technical solution, the connecting structure includes a first connecting unit and a second connecting unit that are respectively arranged at both ends of the bracket.

[0020] The first connecting unit includes a connecting seat, and the connecting seat has a perforation. The second connecting unit has an L-shaped connecting hook that can pass through the perforation and is detachably connected to the connecting seat.

[0021] As a further optimized technical solution, there are two connecting seats arranged in parallel, and two L-shaped connecting hooks are arranged corresponding to the L-shaped connecting hooks. The two L-shaped connecting hooks are arranged symmetrically. The second connecting unit further includes a driving structure for driving the two L-shaped connecting hooks to approach or move away from each other to facilitate disassembly and assembly with the connecting seat.

[0022] As a further optimized technical solution, the driving structure includes a double-headed screw rod and a guiding component arranged in parallel. The double-headed screw rod is rotationally matched with the moving frame body, and both ends of the guiding component are fixedly connected to the moving frame body. The two L-shaped connecting hooks are respectively arranged in two sections of the double-headed screw rod with opposite threads and are respectively threadedly matched with the double-headed screw rod. The two L-shaped connecting hooks are slidably matched with the guiding component. Rotating the double-headed screw rod can drive the two L-shaped connecting hooks to approach or move away from each other relatively.

[0023] As a further optimized technical solution, the guiding component is a rod-shaped structure. The two L-shaped connecting hooks are sleeved on the guiding component and are slidably matched with the guiding component.

[0024] As a further optimized technical solution, the connecting seat is hinged to the bracket, a connecting rod is hinged between the two connecting seats, and a driving component capable of pushing the connecting seat to rotate is arranged on the bracket to drive the connecting seat to rotate and retract or extend out of the bracket.

[0025] As a further optimized technical solution, during the process of moving the shield machine, the hydraulic jacks are arranged on the side of the bracket to push the bracket to move along the translation route in stages.

[0026] Beneficial effects: In confined space scenarios such as underground excavation stations, the traditional method of lifting out a shield machine relies on a spacious ground site and a large equipment operation space, and is often limited by insufficient site and narrow space. This construction method breaks through this limitation through the method of sectional translation. Taking a project of an underground excavation station in a certain city as an example, the surrounding area of this station is a dense commercial area, and the ground construction site is less than one-third of that required by the traditional method. After adopting this method, the shield machine was successfully transferred from the receiving position to the hoisting port and the hoisting operation was completed, effectively solving the problem of limited space. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The schematic diagrams in the specification that form a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:

[0028] Figure 1 is a schematic flow diagram of the construction method according to an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of the construction site according to an embodiment of the present invention;

[0030] Figure 3 is a schematic diagram of the front shield translation according to an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of the receiving base structure according to an embodiment of the present invention;

[0032] Figure 5Schematic diagram of the bracket structure according to an embodiment of the present invention;

[0033] Figure 6 is Figure 4 Schematic diagram in the A-A direction in;

[0034] Figure 7 Schematic diagram of the receiving base supporting the shield machine according to an embodiment of the present invention.

[0035] In the figure: 100, shield machine; 110, front shield; 120, middle shield; 130, tail shield; 200, receiving position; 300, lifting port; 400, first running route; 500, second running route; 600, longitudinal movement path; 700, transverse movement path; 800, receiving base; 810, bracket; 811, support plate; 812, support beam; 813, support rail; 815, connecting seat; 816, perforation; 817, L-shaped connecting hook; 818, double-headed screw; 819, guiding component; 820, connecting rod; 821, driving component; 900, hydraulic jack. Detailed implementation manners

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0037] In the description of the present invention, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The terms "connected" and "coupled" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0038] The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0039] The shapes and sizes of the components in the drawings do not reflect the actual proportions of the products, and the purpose is only to schematically illustrate the content of the present invention.

[0040] Embodiment 1

[0041] During the construction of the shield tunneling sections from Shanyang Road Station to Heping South Street Station and from Heping South Street Station to Jiaxing Street Station in the first phase of the civil engineering construction of Shenyang Metro Line 3, the stations are located in busy traffic areas, resulting in the hoisting position of the shield machine after reception not being at the reception opening. To successfully complete the recovery of the shield machine, the construction method provided by the present invention includes steps such as construction preparation, laying steel plates and setting up the reception base, shield machine reception, shield machine disassembly, sectional translation, and hoisting. By clearing specific translation routes, including longitudinal movement paths and transverse movement paths, conditions are created for the sectional translation of the shield machine; the use of a detachable reception base facilitates the parking and subsequent disassembly operations of the shield machine; hydraulic jacks are used to push the brackets in stages to achieve the movement of each part of the shield machine along the planned route in a restricted space, and finally reach the hoisting opening and complete the hoisting. The present invention realizes efficient and rapid construction by transferring the shield machine in sections.

[0042] Specifically, as Figure 1 , Figure 2 , Figure 3 shown, the construction method for sectional transfer of the shield machine in a restricted space includes the following steps:

[0043] S1, Construction preparation. According to the specific terrain of the site and the running route of the shield machine, accurately measure and mark the translation route between the reception position 200 of the shield machine 100 and the hoisting opening 300. The translation route includes a longitudinal movement path 600 that vertically connects the ends of the first running route 400 and the second running route 500. A transverse movement path 700 is arranged to extend away from the first running route 400 at the connection position of the longitudinal movement path 600 and the first running route 400. The reception position 200 of the shield machine 100 is located at one end where the longitudinal movement path 600 is connected to the second running route 500, and the hoisting opening 300 is located at one end of the transverse movement path 700 away from the first running route 400. Then, thoroughly clean this translation route, removing obstacles and sundries on the route to ensure the smooth progress of subsequent construction.

[0044] S2, Lay 20-mm-thick steel plates on the cleaned translation route. The steel plates are closely arranged together, and the gaps between the steel plates are welded and polished to be flush with the steel plate surface to provide a flat and stable moving support surface. At the same time, set up the reception base 800 at the reception position 200 of the shield machine 100.

[0045] In this embodiment, the reception base 800 includes three detachably connected brackets 810. Specifically, as Figure 4 shown, after the shield machine 100 is parked on the reception base 800, the front shield 110, the middle shield 120, and the tail shield 130 are respectively located on one bracket 810.

[0046] As Figure 5 , Figure 6As shown, each bracket 810 includes a movable frame body and a connecting structure.

[0047] The movable frame body includes a support plate 811 arranged at the bottom and a support frame welded and fixed on the top of the support plate 811 for directly supporting the shield machine 100. The support frame has support beams 812 arranged at intervals transversely and support rails 813 arranged on the support beams 812. There are two groups of support rails 813 arranged symmetrically for jointly supporting the shield machine 100.

[0048] The connecting structure is arranged at the end of the movable frame body for connecting adjacent brackets 810.

[0049] The connecting structure includes a first connecting unit and a second connecting unit respectively arranged at both ends of the bracket 810;

[0050] Specifically, the first connecting unit includes a connecting seat 815. The connecting seat 815 has a through hole 816 arranged transversely. The second connecting unit has an L-shaped connecting hook 817 that can pass through the through hole 816 and is detachably connected to the connecting seat 815. When the first connecting unit and the second connecting unit are connected, the connection with the connecting seat 815 is realized by hanging the L-shaped connecting hook 817 through the through hole 816.

[0051] In order to ensure the stability of the connection, in this embodiment, there are two connecting seats 815 arranged in parallel, and two corresponding L-shaped connecting hooks 817 are arranged. The two L-shaped connecting hooks 817 are arranged symmetrically. The second connecting unit further includes a driving structure for driving the two L-shaped connecting hooks 817 to approach or move away from each other to facilitate the disassembly and assembly with the connecting seat 815.

[0052] In this embodiment, the driving structure includes a double-headed screw 818 and a guiding member 819 arranged in parallel. The double-headed screw 818 is rotationally matched with the movable frame body through a bearing. Both ends of the guiding member 819 are fixedly connected to the movable frame body. The two L-shaped connecting hooks 817 are respectively arranged in two sections with opposite threads of the double-headed screw 818 and are respectively threadedly matched with the double-headed screw 818. The two L-shaped connecting hooks 817 are slidably matched with the guiding member 819. Rotating the double-headed screw 818 can drive the two L-shaped connecting hooks 817 to approach or move away from each other relatively.

[0053] In this embodiment, the guiding member 819 is a rod-shaped structure. The two L-shaped connecting hooks 817 are sleeved on the guiding member 819 and are slidably matched with the guiding member 819.

[0054] In the above solution, the length extension direction of the double-headed screw 818 is arranged parallel to the width direction of the bracket 810, and the driving end of the double-headed screw 818 extends to one side of the bracket 810. In this way, when the shield machine 100 is located above the receiving base 800, it is convenient to operate the disassembly of the bracket 810 from the side of the receiving base 800.

[0055] In the present invention, when the normal connecting seat 815 is connected to the L-shaped connecting hook 817, the connecting seat 815 extends out of a part of the bracket 810. When it is necessary to translate the shield machine 100 in sections, the double-headed screw 818 drives the two L-shaped connecting hooks 817 to move away from each other. At this time, if the bracket 810 is directly moved horizontally (especially when the bracket 810 where the front shield 110 is located is directly facing the longitudinal translation path 600, it is most convenient to directly perform the translation operation along the longitudinal translation path 600 after the bracket 810 is disconnected), the connecting seat 815 is likely to interfere with the L-shaped connecting hook 817. It is necessary to first operate the two disconnected brackets 810 to maintain a certain distance until there is no longer a risk of interference between the connecting seat 815 and the L-shaped connecting hook 817, and then translate the bracket 810. The operation is very cumbersome. In the present invention, in order to facilitate the operation of the bracket 810 to move after the bracket 810 is disconnected, the connecting seat 815 is hinged to the bracket 810, a connecting rod 820 is hinged between the two connecting seats 815, and a driving member 821 capable of pushing the connecting seat 815 to rotate is provided on the bracket 810. In this embodiment, the driving member 821 is a screw, and two screws are symmetrically arranged. The screw is threadedly connected to the moving frame body, and the two screws cooperate with each other to drive the connecting seat 815 to rotate and retract or extend out of the bracket 810.

[0056] Specifically, when the connecting seat 815 needs to extend, as Figure 5 shown, the two screws are respectively tightened against one side of a connecting seat 815. The connecting seat 815 is perpendicular to the width direction of the bracket 810, so as to facilitate the connection between the connecting seat 815 and the L-shaped connecting hook 817. After the connection between the connecting seat 815 and the L-shaped connecting hook 817 is disconnected, the left screw moves to the left, leaving a space for the right screw to move to the left and then push the connecting seat 815 to rotate, so that one end of the connecting seat 815 extending out of the bracket 810 is retracted into the bracket 810. At this time, there is no longer a risk of interference between the connecting seat 815 and the L-shaped connecting hook 817, and the bracket 810 can be directly moved.

[0057] S3. After the shield machine 100 completes the second running route 500, the portal is demolished at the end of the second running route 500. When demolishing the portal, the operation shall be carried out strictly in accordance with the construction specifications and safety requirements to ensure that the shield machine 100 and the surrounding structures are not damaged during the demolition process. After the shield machine 100 demolishes the portal, it slowly moves onto the receiving base 800, so that the front shield 110, the middle shield 120 and the tail shield 130 are respectively located on one section of the bracket 810. The state of the receiving base 800 supporting the shield machine is specifically as Figure 7 shown.

[0058] S4. Use professional disassembly tools to disassemble the front shield 110, middle shield 120 and tail shield 130 of the shield machine 100 according to the pre-developed disassembly plan. During the disassembly process, number each connecting bolt and component, make marks on the surface of the components with a marker pen, and record in detail the connection relationship and installation position of each component to form a disassembly record document for subsequent assembly.

[0059] The specific disassembly steps are as follows:

[0060] S401. Removal of the conveyor belt in the front shield 110: After the muck conveyor has completed mucking, clean the belt in a timely manner, cut the conveyor belt, and use a battery-powered vehicle to pull the belt out of the tunnel.

[0061] S402. Removal of the high-voltage cables of the shield machine 100: After the high-voltage cables are powered off, use the manual recovery method to coil the high-voltage cables of the shield machine 100 in sequence on the flatbed of the battery-powered vehicle, and pay attention to protecting the cables from being damaged.

[0062] S403. Pipeline removal: The pipeline removal is carried out in accordance with the general principle of first removing water, gas, grease and then hydraulic pressure. During the removal process, focus on the pipelines between two adjacent connecting parts of the shield body of the shield machine 100. When removing, consider the convenience of disassembly and installation and the selection of the fixed end of the pipeline to prevent pipeline crushing and installation difficulties caused by improper selection of the fixed end. During the removal process, be sure to pay attention to making joint marks and protecting the marks, and use plugs or clean plastic films to wrap the joints to fix the pipelines for convenient hoisting. Remove the straps and seals, connect the pipelines strictly according to the drawings and markings, and clean the hydraulic system.

[0063] S404. Removal of electrical cables: The electrical circuits have been fully marked during installation. The circuit markings should be strictly made in combination with the electrical drawings, and the connection terminals should be protected after removal. Pay attention to protecting the cables from being damaged.

[0064] S405. Sectional disassembly of the shield machine 100: Remove the components connecting the front shield 110, middle shield 120 and tail shield 130 of the shield machine 100, so that the front shield 110, middle shield 120 and tail shield 130 are separated from each other.

[0065] S5. Translate the front shield 110, middle shield 120 and tail shield 130 respectively by using hydraulic jacks 900 along the longitudinal movement path 600. After rotating at the intersection of the longitudinal movement path 600 and the transverse movement path 700, move along the transverse movement path 700 to the position of the lifting port 300. During the movement of the shield machine 100, the hydraulic jacks 900 are arranged on the side of the bracket 810 to push the bracket 810 to move along the translation route in stages.

[0066] Specifically, the translation process is described in detail taking the front shield 110 as an example. As Figure 5As shown in the figure, first, install two 200t hydraulic jack cylinders 900 on one side of the bracket 810 that supports the front shield 110. Weld bracket legs on the steel plate to provide reaction force for the hydraulic jack 900. Open the hydraulic pump station, and use the two cylinders to translate the bracket 810 as a whole simultaneously. After reaching the maximum safe stroke of the jack, remove the bracket legs and reinstall the hydraulic jack 900 to cycle the translation construction. The thrust for the forward movement of the front shield 110 starting from rest is controlled within 1000 KN. Try to keep the horizontal direction during the translation process, and observe the safety distance of the front shield 110 at any time, as well as whether there is deformation in the structures of the bracket 810 and the bracket legs.

[0067] When the front shield 110 is translated to the intersection position of the longitudinal movement path 600 and the transverse movement path 700, since the transverse movement path 700 and the longitudinal movement path 600 are perpendicular to each other, the bracket 810 needs to rotate 90° and then continue to move along the transverse movement path 700. During the rotation process, arrange the two hydraulic jacks 900 on both sides of the bracket 810 respectively, and the two hydraulic jacks 900 are located at one end of the bracket 810 for pushing. Pay attention to the angle relationship between the telescopic direction of the cylinder and the bracket 810 during the pushing process. Weld the positions of the bracket legs multiple times, adjust the angle of the cylinder, and the rotation angle each time is 4° - 8° to prevent the cylinder from popping out and hurting people. Finally, push and translate and rotate the shield body by 90° by adjusting and changing the welded bracket leg positions multiple times. After the rotation is completed, arrange the two hydraulic jacks 900 on one side of the bracket 810 to jointly push the bracket 810 to translate along the transverse movement path 700 until it is directly below the hoisting opening 300.

[0068] S6. After the front shield 110, the middle shield 120, and the tail shield 130 are successively moved to the position of the hoisting opening 300, use appropriate hoisting equipment outside the hoisting opening 300 to hoist the tail shield 130, the middle shield 120, and the front shield 110 out of the tunnel. During the hoisting process, strictly abide by the hoisting operation procedures to ensure hoisting safety.

[0069] It can be understood that the above description is only exemplary, and the embodiments of the present application do not limit this.

[0070] The above are only the preferred embodiments of the present invention, and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A construction method for segmented transfer of a shield machine in a confined space, characterized in that: The following steps are involved: S1, construction preparation, clearing the translation route between the receiving position (200) of the shield machine (100) and the lifting port (300), the translation route including a longitudinal movement path (600) vertically connecting the ends of the first operation route (400) and the second operation route (500), a transverse movement path (700) extending from the connection position of the longitudinal movement path (600) and the first operation route (400) in a direction away from the first operation route (400), the receiving position (200) of the shield machine (100) is located at one end where the longitudinal movement path (600) and the second operation route (500) are connected, and the lifting port (300) is located at one end of the transverse movement path (700) away from the first operation route (400); S2, fully paving the cleaned translation route with steel plates, and setting the receiving base (800) at the receiving position (200) of the shield machine (100); S3, after the shield machine (100) completes the construction of the second operation route (500), the tunnel door is broken at the end of the second operation route (500), and the shield machine (100) moves to the receiving base (800) after breaking the tunnel door; S4, disassembling the front shield (110), the middle shield (120) and the rear shield (130) of the shield machine (100); S5, the front shield (110), the middle shield (120) and the rear shield (130) are respectively translated along the longitudinal path (600) by using a hydraulic jack (900), and after being rotated at the intersection of the longitudinal path (600) and the transverse path (700), they are moved along the transverse path (700) to the position of the lifting opening (300); S6, completing the hoisting of the front shield (110), the middle shield (120) and the rear shield (130) in sequence outside the hoisting opening (300); The receiving base (800) includes a plurality of detachably connected brackets (810). Each bracket (810) comprises: a connection structure, which is arranged at the end of the movable frame body and is used to connect adjacent brackets (810); The connection structure comprises a first connection unit and a second connection unit which are respectively arranged at two ends of the bracket (810); The first connection unit comprises a connection seat (815), the connection seat (815) has a through hole (816), and the second connection unit has an L-shaped connection hook (817) that can pass through the through hole (816) and be detachably connected to the connection seat (815); Two connecting seats (815) are arranged in parallel, and two corresponding L-shaped connecting hooks (817) are arranged, and the two L-shaped connecting hooks (817) are arranged symmetrically. The second connecting unit also includes a driving structure for driving the two L-shaped connecting hooks (817) to move closer to or farther from each other, so as to facilitate disassembly and assembly with the connecting seat (815); The driving structure comprises a double-headed screw (818) and a guide component (819) arranged in parallel, the double-headed screw (818) is rotationally matched with the movable frame, and the two ends of the guide component (819) are respectively fixedly connected to the movable frame, and the two L-shaped connecting hooks (817) are respectively arranged in two opposite sections of the double-headed screw (818) and are respectively threadedly matched with the double-headed screw (818), and the two L-shaped connecting hooks (817) are slidingly matched with the guide component (819), and the rotation of the double-headed screw (818) can drive the two L-shaped connecting hooks (817) to be relatively close to or relatively far away; The guide component (819) is a rod-shaped structure, and the two L-shaped connecting hooks (817) are sleeved on the guide component (819) and slidably cooperate with the guide component (819); The connecting seat (815) is hinged to the bracket (810), a connecting rod (820) is hinged between the two connecting seats (815), and a driving component (821) is provided on the bracket (810) that can push the connecting seat (815) to rotate, so as to drive the connecting seat (815) to rotate and be retracted into or extended from the bracket (810); When the front shield moves to the intersection of the longitudinal path and the transverse path, the bracket needs to rotate 90° and then continue to move along the transverse path. During the rotation, two hydraulic jacks are arranged on both sides of the bracket. The two hydraulic jacks are located at one end of the bracket for pushing. The position of the bull legs is welded multiple times, and the cylinder angle is adjusted. The rotation angle is 4° to 8° each time. After the rotation is completed, the two hydraulic jacks are arranged on one side of the bracket to jointly push the bracket to move along the transverse path until it is directly below the lifting port.

2. The method for section-by-section transfer of a shield machine in a confined space according to claim 1 is characterized in that: In S2, after the shield machine (100) is parked on the receiving base (800), the front shield (110), the middle shield (120) and the rear shield (130) are respectively located on a bracket (810).

3. The method for section-by-section transfer of a shield machine in a confined space according to claim 2 is characterized in that: Each section of the bracket (810) comprises: The mobile frame comprises a support plate (811) arranged at the bottom and a support frame arranged on the top of the support plate (811) for directly supporting the shield machine (100).

4. The method for section-by-section transfer of a shield machine in a confined space according to claim 3 is characterized in that: The support frame comprises support beams (812) arranged at intervals in the transverse direction and support rails (813) arranged on the support beams (812); two groups of support rails (813) are symmetrically arranged and are used to jointly support the shield machine (100).

5. The method for section-by-section transfer of a shield machine in a confined space according to claim 2 is characterized in that: During the process of moving the shield machine (100), the hydraulic jack (900) is arranged on the side of the bracket (810) to push the bracket (810) along the translation route in stages.

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