Shield tail rounding device and method

Abstract

The application discloses a shield tail roundness adjusting device and method, and aims to solve the problem of shield tail roundness correction caused by the fact that the shield tail roundness does not meet the design requirements and affects tunnel excavation and shield tail roundness during segment paving. The cross beam rotating through the sliding of the two side supporting arms along the supporting frame arc-shaped beam can realize full-circle horizontal scanning of the inner surface of the shield tail to cover all the deformation areas of the shield tail. Then, the correction of each deformation area is realized through the movable hydraulic cylinder at the bottom of the cross beam. Since the cross beam is driven by a motor, the correction operation can be realized at the positions inconvenient for manual operation on both sides and the top of the shield tail, and the efficiency of the shield tail roundness adjustment is improved.

Description

Technical Field

[0001] This invention application relates to the field of shield tunneling technology, specifically to a shield tail rounding device and method. Background Technology

[0002] The shield tail is a crucial component of a tunnel boring machine (TBM), ensuring the stability and waterproofing of the tunnel during construction. Located at the rear of the TBM, it connects to the cutterhead, forming a complete tunneling system. The primary functions of the shield tail are to provide protection and support, preventing soil and groundwater from entering the tunnel, while maintaining stability in the tunneling direction and attitude. Furthermore, the shield tail's structural equipment includes multiple components such as waterstops, support rings, and segment installation devices. Waterstops prevent groundwater from entering the tunnel, while support rings provide support and guidance, ensuring tunnel stability. The segment installation devices are responsible for assembling the tunnel segments together to form the final tunnel.

[0003] Due to the heavy weight of the shield tail, the overall safety risks of hoisting and lowering it into the shaft are relatively high. Therefore, the common practice is to assemble the shield tail in sections. During the transportation and hoisting of the shield tail sections, they are easily subjected to external forces, which can cause deformation in some areas of the shield tail, thus affecting the roundness of the shield tail. The roundness of the shield tail after assembly directly affects the shield tail gap. If the shield tail gap is uneven, the shield may encounter different resistances during the advancement process, leading to reduced advancement efficiency and stability problems. Furthermore, if the shield tail gaps are not uniform in different places, it is not conducive to maintaining a good lining clearance, which can easily cause damage and breakage of segments during installation, and may even cause the segments to be subjected to additional stress, leading to segment damage or tunnel deformation.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the background technology of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] In view of at least one of the above technical problems, this disclosure provides a shield tail rounding device and method, which aims to solve the problem of shield tail roundness correction when the shield tail roundness does not meet the design requirements and affects tunnel excavation and segment laying.

[0006] According to one aspect of this disclosure, a shield tail adjustment device is provided, comprising two supports for correspondingly fitting on the outer surface of the shield tail and including several segments. Each support includes an arc-shaped beam matching the curvature of the shield tail, several support legs disposed at positions corresponding to the outer arc surface of the arc-shaped beam, an arc-shaped groove disposed on one side of the arc-shaped beam and matching the curvature of the shield tail, and a toothed ring disposed on one side of the groove with its teeth facing the center of the support. The shield tail adjustment device further includes a slider correspondingly fitted in the groove, a support arm correspondingly connected to the slider and correspondingly coinciding with the radius of the shield tail, a gear disposed on the corresponding side of the support arm and correspondingly matched with the toothed ring, a motor relatively fixed to the support arm and having its power shaft correspondingly passing through the support arm and being drivenly connected to the gear, a crossbeam perpendicular to the support arm and disposed along the axial direction of the shield tail, and a hydraulic cylinder disposed at the bottom of the crossbeam for pushing the deformation area of ​​the shield tail.

[0007] In some embodiments of this disclosure, the arc array between the chute and the arc beam is provided with several reinforcing ribs.

[0008] In some embodiments of this disclosure, the crossbeam is disposed between the two support arms corresponding to the two supports via a flange.

[0009] In some embodiments of this disclosure, the support arm is provided with a base plate for mounting the motor at a position corresponding to the side wall of the motor, and a plurality of reinforcing ribs are provided between the base plate and the support arm.

[0010] In some embodiments of this disclosure, the bottom of the crossbeam is provided with a guide groove, and the hydraulic cylinder is correspondingly slidably embedded in the guide groove.

[0011] In some embodiments of this disclosure, the height of the support arm is less than half the diameter of the shield tail.

[0012] According to another aspect of this disclosure, a shield tail adjustment method is provided, implemented based on the aforementioned shield tail adjustment device, comprising the following steps: (1) When the reinforcing steel of the starting shaft is tied, the pre-embedded seat is anchored at the designed installation position of the shield tail rounding device. The pre-embedded position of the pre-embedded seat corresponds to each support leg of the support frame. (2) Before the shield tail is hoisted in sections, the bottom sections of the two support frames are hoisted first, and the bottom sections are fixedly connected to the pre-embedded seats corresponding to the bottom of the launching shaft. (3) The bottom section of the shield tail is hoisted into the well and placed between the two support frames and aligned with the arc beams of the two support frames; (4) The support arms with sliders are hoisted into the outer sliding grooves of the two support frames. After the sliders are fitted into the sliding grooves, scaffolding is erected to temporarily support the support arms on both sides. (5) Hoist the crossbeam and connect and fix both ends of the crossbeam to the two side support arms respectively; (6) The two sides of the support frame are hoisted and lowered into the well, and connected and fixed to the bottom section of the support frame and the pre-embedded seat on the side wall of the starting well. Then the remaining sections of the shield tail are lowered into the well. After the shield tail is hoisted and assembled, the top section of the support frame is lowered into the well. (7) Use a total station to observe the roundness of the shield tail. Based on the observation results, drive the motors on both sides of the support arm to rotate until the crossbeam moves above the deformation area. Then, adjust the position of the hydraulic cylinder along the crossbeam to above the deformation area and drive the hydraulic cylinder to extend for jacking correction. During the correction process, use a total station to observe in real time until the deformation area of ​​the shield tail meets the requirements and drive the hydraulic cylinder to retract. (8) Repeat step (7) until the roundness of the shield tail meets the design requirements.

[0013] In some embodiments of this disclosure, in step (2), after the bottom section of the support frame is hoisted into place, a total station is used to observe the installation position of the bottom section. Based on the observation results, the positions of the two bottom sections are adjusted so that they are coaxially arranged and their respective axes coincide with the starting axis of the tunnel boring machine.

[0014] In some embodiments of this disclosure, in step (4), before the boom is hoisted, lubricating oil is applied to the arc-shaped groove.

[0015] In some embodiments of this disclosure, in step (6), after the corresponding segments of the support frame are connected and fixed, the joints of the segments are polished and trimmed until the seams are smooth.

[0016] One or more technical solutions provided in the embodiments of this application have at least one of the following technical effects or advantages: 1. The crossbeam, which rotates by sliding along the arc-shaped beam of the support frame on both sides, can achieve a full-circle sweep of the inner surface of the shield tail to cover all deformation areas of the shield tail. Then, the hydraulic cylinder at the bottom of the crossbeam can correct each deformation area. Since the crossbeam is driven by a motor, it can also perform correction operations on the sides and top of the shield tail where it is inconvenient to perform manual operations, thus improving the efficiency of shield tail rounding.

[0017] 2. Since the crossbeam is supported by two side arms, and the sliders at the arms are embedded in the grooves with reinforcing ribs on the side walls, the crossbeam can withstand a certain load when the hydraulic cylinder extends to perform the correction operation, thus ensuring the stability and reliability of the shield tail correction and rounding.

[0018] 3. The support frame is connected and fixed to the corresponding embedded parts at various points in the launching shaft through each support leg, thereby ensuring the stable installation of the rounding device, providing reliable support for the shield tail, avoiding deformation and tilting of the support frame after being subjected to reaction force, and ensuring the stability of the device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the shield tail rounding device in one embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the bottom block of the shield tail rounding device in one embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the support arm of the shield tail rounding device in one embodiment of this application.

[0022] In the above figures, 1 is the support frame, 11 is the arc beam, 12 is the support leg, 13 is the arc groove, 14 is the gear ring, 15 is the flange, 16 is the reinforcing rib, 21 is the support arm, 22 is the slider, 23 is the motor, 24 is the gear, 25 is the seat plate, 26 is the reinforcing rib, 3 is the crossbeam, and 4 is the hydraulic cylinder. Detailed Implementation

[0023] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "vertical," "horizontal," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. They do not have any sequential or technical meaning. Furthermore, the terms "connection" and "linkage" in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0024] Unless otherwise specified, the components, structures, mechanisms, and other devices involved in the following embodiments are all commercially available products.

[0025] To better understand the technical solution of this application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] This example discloses a shield tail rounding device. See [link to relevant documentation]. Figure 1 It mainly includes two support frames 1, which are fitted onto the outer surface of the shield tail and consist of several sections. The two support frames serve to support the shield tail and provide the circulation path for the roundness correction mechanism to achieve full-circle correction.

[0027] For details, see Figure 2The support frame includes an arc-shaped beam 11, several support legs 12, an arc-shaped groove 13, and a toothed ring 14. To provide reliable support for the shield tail and ensure its stable placement within the support frame during roundness correction, the support frame 1 in this example includes an arc-shaped beam 11. The curvature of the arc-shaped beam 11 matches the curvature of the outer contour of the shield tail, allowing it to fit snugly against the outer edge of the shield tail. This ensures that all corresponding positions on the shield tail are supported by the arc-shaped beam 11, preventing swaying during roundness correction. However, due to the large overall size of the support frame 1, its overall hoisting and lowering into the well poses certain risks and hinders the subsequent hoisting and lowering of the shield tail. Positional interference between the two components can easily occur, increasing the difficulty of lowering the shield tail into the well. Therefore, in this embodiment, the support frame 1 comprises four sections: a bottom section, two side sections, and a top section. These four sections are hoisted and assembled sequentially to avoid interference with the shield tail hoisting. To ensure the connection and fixation between the various sections, and considering the ease of disassembly after the shield tail is launched, in this embodiment, see... Figure 2 Flanges 15 are installed on both sides of the arc beam of each segment of the support frame, thereby achieving alignment and fixation between each segment of the support frame through flange connection.

[0028] Since the arc-shaped beam 11 has an arc-shaped structure, and in order to achieve stable support for the shield tail, in this embodiment, see... Figure 2 At the bottom of the curved beam 11, there are vertically arranged support legs 12. In this example, there are a total of three support legs 12. One support leg 12 is located at the center of the curved beam 11, and the other two support legs 12 are arranged symmetrically about the support leg. This ensures the force balance of the curved beam 11, avoids deformation of the curved beam due to uneven force, and can achieve reliable support for the curved beam 11. In addition, in this embodiment, each support leg 12 is provided with a flange connection plate at its bottom, which can be directly or indirectly connected and fixed to the launching shaft to ensure the stability of the support frame and avoid lateral displacement or other displacements during shield tail hoisting or force adjustment, which would affect the shield launching.

[0029] Due to the large diameter of the shield tail, roundness correction on both sides and the top of the shield tail is difficult to perform manually and is time-consuming and labor-intensive. Therefore, this example implements the circular motion of the correction mechanism, driven by a motor to reach different positions to be corrected, thereby improving the efficiency of shield tail roundness correction. For details, see [link to details]. Figure 2An arc-shaped groove 13 is provided on one side of the arc-shaped beam. The curvature of the arc-shaped groove 13 is consistent with the curvature of the shield tail, thus providing a path for the correction mechanism to achieve the purpose of rounding various parts of the shield tail. In addition, considering that the correction mechanism has a certain weight, in order to achieve good support for it, in this embodiment, the groove wall of the arc-shaped groove 13 has a certain thickness and height, and is firmly welded to the arc-shaped beam 11. The weld points inside the groove are ground smooth and flat. Furthermore, several reinforcing ribs 16 are arranged along the arc of the longer side wall of the arc-shaped groove 13. The reinforcing ribs 16 strengthen the connection between the corresponding groove wall of the arc-shaped groove and the arc-shaped beam 11, thereby improving the stress strength of the arc-shaped groove 13.

[0030] The slider 22, which mates with the arc-shaped groove 13, is embedded therein to achieve sliding along the groove. See details below. Figure 3 The thickness of the slider 22 is consistent with the width of the arc-shaped groove 13, and the curvature of the slider 22 matches the curvature of the arc-shaped groove. This allows the slider 22 to fit tightly into the arc-shaped groove 13 and move along the groove. A support arm 21 is welded to the middle of one side of the slider 22, so that the centerline of the support arm 21 coincides with the centerline of the slider 22. This ensures that when the slider 22 is fitted into the arc-shaped groove 13, the radius of the support arm 21 coincides with the corresponding radius of the shield tail, ensuring the force balance during subsequent hydraulic cylinder force adjustment. In this example, the support arm 21 and the slider 22 are welded together. Considering that the connection between the two will be subjected to a large load during correction and adjustment, angular ribs are provided on both sides and the bottom of the support arm 21 to improve the connection strength and increase the stress level.

[0031] In this example, see Figure 1 Two supports 1 are coaxially arranged, and correspondingly, two support arms 21 are respectively installed in the sliding grooves on both sides of the supports 1. In addition, a crossbeam 3 is provided at the top of the two support arms 21, which is arranged along the axial direction of the shield tail. In this example, in order to realize the connection between the crossbeam 3 and the two support arms 21, flanges are provided at the top of the two support arms 21 and at the bottom of both ends of the crossbeam 3, thereby realizing a stable connection between the crossbeam 3 and the two support arms 21, and thus realizing the reliable transmission of the corrective reaction force. By sliding the two support arms synchronously along the groove, the crossbeam can realize the full projection of the inner arc surface of the shield tail, and then the hydraulic cylinder connected to the crossbeam 3 can achieve the purpose of correcting and rounding the deformed areas of the shield tail. In addition, in this example, in order to reduce the weight of the support arms and consider the subsequent movement stroke and force stability of the hydraulic cylinder, the height of the support arms is less than half of the radius of the shield tail.

[0032] To achieve automatic circular motion of the two support arms 21, in this embodiment, see [link to documentation]. Figure 3A motor 23 is provided on one side of the support arm 21. The power shaft of the motor 23 passes through the support arm 21 via a bearing, and the end of the power shaft protrudes from the side wall of the support arm and is connected to a gear 24 that rotates with the shaft. The gear 24 matches the gear ring 14 at the arc-shaped beam 11. Furthermore, the height of the gear 24 is such that after it corresponds and engages with the gear ring 14, the slider 22 is precisely embedded in the arc-shaped groove 13. Thus, see Figure 1 Driven by the motor 23, the gear 24 rotates with the motor power shaft, and then through the toothed transmission between the remaining gear rings 14, the slider 22 at the support arm 21 is driven to rotate along the arc-shaped groove, so as to achieve the purpose of the crossbeam 3 running above any deformation area of ​​the shield tail.

[0033] Furthermore, in this embodiment, see Figure 3 To ensure the stable installation of the motor 23 and prevent it from rotating with the rotating shaft, a seat plate 25 is horizontally provided on one side of the support arm 21, and the motor 23 is fixedly connected to the seat plate 25. To ensure the connection strength between the seat plate 25 and the support arm 21, in this example, several reinforcing ribs 26 are provided at the bottom of the seat plate 25, thereby improving the stress strength of the seat plate 25.

[0034] To achieve rounding adjustment of the deformed area at the shield tail, a hydraulic cylinder 4 is provided at the bottom of the crossbeam 3. The adjustment of the deformed area at the shield tail is achieved by pushing with this hydraulic cylinder. However, considering that the crossbeam 3 is arranged along the axial direction of the shield tail, it can only cover a portion of the axial area at any given time. To achieve rounding adjustment at various positions within this axial area, in this embodiment, a guide groove is provided at the bottom of the crossbeam 3, and the hydraulic cylinder 4 is embedded in this guide groove and can move along the groove. Similarly, to facilitate adjustment of the position of the hydraulic cylinder 4 relative to the crossbeam 3, a displacement mechanism is also provided. In this example, the displacement mechanism uses a common rack and pinion drive. In other embodiments, a chain drive is used, or a traveling wheel or electric lead screw embedded in the guide groove is provided, thereby achieving adjustment of the relative position of the hydraulic cylinder 4. This achieves the purpose of correcting the deformed area at any position.

[0035] This example also discloses a shield tail adjustment method based on the above-mentioned shield tail adjustment device, which mainly includes the following steps: (1) When the reinforcing steel of the starting shaft is tied, the pre-embedded seat is anchored at the designed installation position of the shield tail rounding device. The pre-embedded position of the pre-embedded seat corresponds to each support leg of the support frame.

[0036] Due to the large size and weight of the shield tail adjustment device, in this embodiment, several pre-embedded seats are pre-installed during the construction of the launching shaft structure to ensure its stable fixation. These pre-embedded seats achieve a stable connection between the shield tail adjustment device and the launching shaft. Specifically, during the binding of the reinforcing bars of the launching shaft's base plate and side wall beams, the designed installation location of the shield tail adjustment device is measured and laid out. Anchoring is then performed between the pre-embedded seats and the launching shaft's reinforcing bars at each layout point. After the launching shaft body is cast, the pre-embedded seats and the launching shaft become a single unit, reliably transferring force to the shaft body and ensuring the stability and safe use of the adjustment device.

[0037] (2) Before the shield tail is hoisted into sections, the bottom sections of the two support frames are hoisted first, and the bottom sections are fixedly connected to the pre-embedded seats corresponding to the bottom of the launching shaft.

[0038] Since the shield tail rounding device is fitted to the outer edge of the shield tail, to avoid interference with the shield tail hoisting and lowering into the shaft, in this embodiment, the bottom section of the shield tail rounding device is hoisted first. Because there are two support frames, the bottom sections of the two support frames are hoisted and lowered into the shaft respectively, fixing them to the corresponding pre-embedded seats at the bottom of the launching shaft. After the bottom sections of the two support frames are hoisted into place, a total station is used to observe the installation position of the bottom sections. Based on the observation results, the positions of the two bottom sections are adjusted until they are coaxially arranged and their corresponding axes coincide with the launching axis of the tunnel boring machine. This ensures that the two support frames fit snugly against the outer edge contour of the shield tail, providing reliable support. After confirming that the bottom sections of the two support frames are adjusted into place, the connection between each support leg and the pre-embedded seat is welded to prevent subsequent positional displacement under stress, which would affect the tunnel boring machine's launching operation.

[0039] (3) The bottom section of the shield tail is hoisted into the well and placed between the two support frames and aligned with the arc beams of the two support frames.

[0040] In this example, since the crossbeam is placed inside the shield tail, to avoid interference with the shield tail hoisting and lowering, the side support arms and crossbeams are not installed when the bottom section of the support frame is lowered into the well. The lowering operation of the bottom section of the shield tail is carried out first, thus avoiding interference between the two. After the bottom section of the shield tail is lowered into the well, a total station is used to observe the placement point of the bottom section of the shield tail to ensure that the bottom section of the shield tail is in the designed starting position and coaxial with the shield tail rounding device, ensuring that the two correspond and fit together.

[0041] (4) Install the support arms with sliders in the outer grooves of the two support frames. After the sliders are fitted into the grooves, erect scaffolding to temporarily support the support arms on both sides.

[0042] After the bottom section of the shield tail is hoisted into place, the support arms and crossbeams can be installed. In this example, the installation of one side of the support arm is carried out first. In order to ensure that the slider can move smoothly along the arc-shaped slide groove, grease is applied to the arc-shaped slide groove for lubrication before the support arm is hoisted. After the slider at the end of one side of the support arm is fitted into the arc-shaped slide groove on that side, scaffolding is erected to temporarily support the support arm and prevent it from falling out of the arc-shaped slide groove.

[0043] (5) Hoist the crossbeam and connect and fix the two ends of the crossbeam to the two side support arms respectively.

[0044] Outside the well, the connection between the other support arm and the crossbeam is carried out. After the two are reliably connected, they are hoisted into the well. The slider of the support arm is then embedded in the arc-shaped groove on that side, and the connection and fixation between the crossbeam and the other support arm are carried out.

[0045] (6) The two sides of the support frame are hoisted and lowered into the well, and connected and fixed to the bottom section of the support frame and the pre-embedded seat on the side wall of the starting well. Then the remaining sections of the shield tail are lowered into the well. After the shield tail is hoisted and assembled, the top section of the support frame is lowered into the well. After each support frame and its corresponding sections are connected and fixed, the joints between the sections are ground and smoothed to prevent unevenness from negatively impacting the movement of the slider along the groove.

[0046] (7) Use a total station to observe the roundness of the shield tail. Based on the observation results, drive the motors on both sides of the support arm to rotate, thereby driving the crossbeam to move until the crossbeam moves above the deformation area. Then, adjust the position of the hydraulic cylinder along the crossbeam to above the deformation area and drive the hydraulic cylinder to extend for jacking correction. During this correction process, use a total station to observe in real time until the deformation area of ​​the shield tail meets the requirements and drive the hydraulic cylinder to retract.

[0047] (8) Repeat step (7) to adjust the roundness of the next deformation area until the roundness of the shield tail meets the design requirements.

[0048] Although some preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0049] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of the invention. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A shield tail adjustment device, characterized in that, It includes two support frames, each consisting of several segments, that are fitted onto the outer surface of the shield tail. Each support frame includes an arc-shaped beam that matches the curvature of the shield tail, several support legs positioned at corresponding positions on the outer arc surface of the arc-shaped beam, an arc-shaped groove on one side of the arc-shaped beam that matches the curvature of the shield tail, and a toothed ring on one side of the groove with its teeth facing the center of the support frame. The shield tail rounding device also includes a slider that is fitted into the groove, a support arm that is connected to the slider and coincides with the radius of the shield tail, a gear on the side of the support arm that is matched and meshed with the toothed ring, a motor that is fixed relative to the support arm and whose power shaft passes through the support arm and is connected to the gear, a crossbeam perpendicular to the support arm and arranged along the axial direction of the shield tail, and a hydraulic cylinder at the bottom of the crossbeam for pushing the deformation area of ​​the shield tail.

2. The shield tail adjustment device according to claim 1, characterized in that, The arc array between the chute and the arc-shaped beam is provided with several reinforcing ribs.

3. The shield tail adjustment device according to claim 1, characterized in that, The crossbeam is positioned between the two support arms corresponding to the two support frames via a flange.

4. The shield tail adjustment device according to claim 1, characterized in that, The support arm is provided with a base plate for mounting the motor at a position corresponding to the side wall of the motor, and a number of reinforcing ribs are provided between the base plate and the support arm.

5. The shield tail adjustment device according to claim 1, characterized in that, The bottom of the crossbeam is provided with a guide groove, and the hydraulic cylinder is correspondingly slidably embedded in the guide groove.

6. The shield tail adjustment device according to claim 1, characterized in that, The height of the support arm is less than half the diameter of the shield tail.

7. A method for adjusting the shield tail circle, implemented based on the shield tail circle adjusting device according to claim 1, characterized in that, Includes the following steps: (1) When the reinforcing steel of the starting shaft is tied, the pre-embedded seat is anchored at the designed installation position of the shield tail rounding device. The pre-embedded position of the pre-embedded seat corresponds to each support leg of the support frame. (2) Before the shield tail is hoisted in sections, the bottom sections of the two support frames are hoisted first, and the bottom sections are fixedly connected to the pre-embedded seats corresponding to the bottom of the launching shaft. (3) The bottom section of the shield tail is hoisted into the well and placed between the two support frames and aligned with the arc beams of the two support frames; (4) The support arms with sliders are hoisted into the outer sliding grooves of the two support frames. After the sliders are fitted into the sliding grooves, scaffolding is erected to temporarily support the support arms on both sides. (5) Hoist the crossbeam and connect and fix both ends of the crossbeam to the two side support arms respectively; (6) The two sides of the support frame are hoisted and lowered into the well, and connected and fixed to the bottom section of the support frame and the pre-embedded seat on the side wall of the starting well. Then the remaining sections of the shield tail are lowered into the well. After the shield tail is hoisted and assembled, the top section of the support frame is lowered into the well. (7) Use a total station to observe the roundness of the shield tail. Based on the observation results, drive the motors on both sides of the support arm to rotate until the crossbeam moves above the deformation area. Then, adjust the position of the hydraulic cylinder along the crossbeam to above the deformation area and drive the hydraulic cylinder to extend for jacking correction. During the correction process, a total station is used for real-time observation until the deformation area at the tail of the shield meets the requirements, at which point the hydraulic cylinder is driven to retract. (8) Repeat step (7) until the roundness of the shield tail meets the design requirements.

8. The shield tail adjustment method according to claim 7, characterized in that, In step (2), after the bottom section of the support frame is hoisted into place, the installation position of the bottom section is observed using a total station. Based on the observation results, the positions of the two bottom sections are adjusted so that they are coaxially arranged and their corresponding axes coincide with the starting axis of the tunnel boring machine.

9. The shield tail adjustment method according to claim 7, characterized in that, In step (4), before the boom is hoisted, lubricating oil is applied to the arc-shaped groove.

10. The shield tail rounding method according to claim 7, characterized in that, In step (6), after each segment of the support frame is connected and fixed, the joints of each segment are polished and trimmed until the seams are smooth.

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