Shield machine crane assembly method

Abstract

The present application discloses a shield machine crane assembly method, which aims to solve the problem of low shield machine crane assembly efficiency and delayed construction period. The method mainly includes the following steps: (1) opening a working shaft; (2) laying out a winch and a sliding track; (3) lowering the bottom component of the reaction frame and the starting platform; (4) hoisting a temporary guide platform; (5) hoisting the segment conveying trolley; (6) (17) lowering the shield body and the rear supporting equipment into the main wellhead and the auxiliary wellhead respectively; (18) moving the shield body forward; (19) installing the intermediate box culvert and the side rails; (20) installing the top of the reaction frame; (21) installing the negative ring segments, and debugging the shield machine. The shield machine crane assembly method disclosed in the present invention has the advantages of high hoisting efficiency and short hoisting period.

Description

Technical Field

[0001] The present application relates to the technical field of shield equipment, and in particular to a shield machine crane assembly method. Background Art

[0002] The shield machine is a large and complex excavation equipment composed of multiple systems such as electricity, gas, and hydraulics. It mainly consists of two parts: the main structure and the rear supporting equipment. Among them, the main structure of the shield machine includes the cutterhead, shield, drive device, segment assembly machine, soil discharge mechanism, etc.; the rear supporting equipment generally consists of a connecting bridge and several trailers. The connecting bridge is a transitional connection device between the shield part and the corresponding rear supporting trailer part. During excavation, the shield drives the connecting bridge and the rear supporting trailer forward. The rear supporting equipment is equipped with an electronic control system, hydraulic system, grouting system, bentonite system, foam system, compressed air system, circulating water system, lubrication system, slag and segment conveying system, and grease seals, etc., to provide various support for the excavation of the main structure of the front end of the shield machine.

[0003] Because the shield machine contains a large number of system components mentioned above, its size and weight make it difficult to transport, hoist, and lower it into the well as a whole. Therefore, after production, the shield machine must be disassembled and transported to the construction site. The components are then hoisted into the shield launch shaft one by one using lifting equipment to assemble the complete machine. Only after commissioning can excavation and excavation begin. During this hoisting process, due to the numerous components and complex structure of the shield machine, the process coordination is difficult, which often leads to low installation efficiency and a significant delay in construction time.

[0004] The information disclosed in this background technology section is only used to deepen the understanding of the background technology of the present disclosure and should not be regarded as an admission or any form of suggestion that the information constitutes the 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, the present disclosure provides a shield machine crane assembly method, which aims to solve the problems of low shield machine crane assembly efficiency and occupied construction period.

[0006] According to one aspect of the present disclosure, a shield machine crane assembly method is provided, comprising the following steps:

[0007] (1) Opening a working well, including a main well opening at the starting tunnel of the shield machine for hoisting the shield machine, an auxiliary well opening with a corresponding connection line parallel to the central axis of the tunnel to be excavated and for hoisting the subsequent supporting trailer, and a connecting cavern opened between the two well openings, with a two-step elevation from the main well opening to the auxiliary well opening;

[0008] (2) A winch is arranged on the surface of the first step which is relatively low and is located at the junction of the two steps; a sliding track is arranged on the surface of the second step, with one end of the sliding track extending below the auxiliary wellhead and the other end extending above the winch and covering the position of the winch;

[0009] (3) Lowering the bottom component of the reaction frame and the starting platform at the main wellhead, wherein the bottom component of the reaction frame and the starting platform are arranged in a direction parallel to the central axis of the tunnel to be excavated;

[0010] (4) hoisting a temporary guide platform on the starting platform; the temporary guide platform includes a plurality of segment rings, and the longitudinal seams of the plurality of segment rings are spliced on the ground before the temporary guide platform is hoisted;

[0011] (5) The segment transport trolleys are hoisted in sections from the main wellhead to the temporary guide platform, and the segment transport trolleys of the corresponding sections are moved horizontally by the winch to a certain distance in the direction of the auxiliary wellhead for subsequent segment transport trolley segment assembly;

[0012] (6) The rear half of trailer No. 1 is hoisted from the main wellhead to the temporary guide platform, and is pulled and moved to the auxiliary wellhead direction by the winch, and the translation distance is such that the two lifting points at the front end of trailer No. 1 are within the lifting range of the main hoist and there is space reserved for the hoisting of the front half of trailer No. 1;

[0013] (7) Hoist the front half of trailer No. 1 downhole from the main wellhead to the temporary guide platform, connect it to the rear half of trailer No. 1, and assemble the corresponding top-level equipment;

[0014] (8) Start the winch to move the No. 1 trailer as a whole to the direction of the auxiliary wellhead until the temporary guide platform is fully exposed, and then remove the temporary guide platform;

[0015] (9) Lower the bottom No. 5 shield at the main wellhead to the corresponding position of the starting platform, and reserve the distance for the cutter head and the tunnel gate steel ring. Then, lower the No. 4 and No. 6 shields in sequence at the main wellhead and connect and fix them between the No. 5 shields. Then, support the No. 4 and No. 6 shields at the corresponding positions. At the same time, lower the front part of the connecting bridge at the auxiliary wellhead and move it horizontally in the direction of the main wellhead through the winch and the sliding track. The front part of the connecting bridge is provided with a supporting wheel pair.

[0016] (10) Lower the M-shaped beam from the main wellhead and fix it to the No. 5, 4, and 6 shields; at the same time, lower the rear part of the connecting bridge at the auxiliary wellhead and move it horizontally in the direction of the main wellhead through the winch and the sliding track to connect it to the front part of the connecting bridge; the rear part of the connecting bridge is provided with a supporting wheel pair;

[0017] (11) The main drive is lowered from the main wellhead through the main drive turning frame and fixedly connected to the shields No. 5, 4, and 6;

[0018] (12) Shields No. 3 and No. 7 are lowered into the main well mouth in sequence and fixed accordingly; at the same time, trailer No. 2 with a corresponding slider welded on the bottom is lowered from the auxiliary well mouth, and is moved horizontally in the direction of the main well mouth through the winch and the sliding track to connect with the rear part of the connecting bridge;

[0019] (13) Lower the side blocks 2 and 8 shields and the top block 1 shield in sequence from the main wellhead and fix them accordingly; at the same time, lower the trailer 3 with a corresponding slider welded on the bottom from the auxiliary wellhead and move it horizontally in the direction of the main wellhead through the winch and the sliding track until it is connected to the trailer 2;

[0020] (14) Lower the tail shield bottom block at the main wellhead and connect it to the shield body, and lower the well segment installation machine from the main wellhead and connect it to the M-beam;

[0021] (15) After the cutterhead is assembled and welded on the ground, two crawler cranes are set up as the main crane and auxiliary crane to help turn the cutterhead over, and the bottom lifting lugs of the cutterhead are removed before assembly and installation in the well.

[0022] (16) The remaining three tail shields are lowered into the well in sequence and installed. At the same time, trailer No. 4 with a corresponding slider welded to the bottom is lowered from the auxiliary wellhead and moved horizontally in the direction of the main wellhead through a winch and a sliding track until it is connected to the corresponding trailer No. 3.

[0023] (17) Lower trailer No. 5 with a corresponding slider welded on the bottom at the auxiliary wellhead, and move it horizontally in the direction of the main wellhead through the winch and sliding track until it is connected to the corresponding trailer No. 4;

[0024] (18) Start the two thrust cylinders at the bottom of the shield machine and move the shield forward until the cutterhead and the tunnel door seal are in contact;

[0025] (19) Move trailer No. 1 forward to connect it to the shield machine, and install side rails on both sides of the middle box culvert from the auxiliary shaft mouth to the connecting bridge area corresponding to the connecting cavern step position; and after trailers No. 2, 3, 4, and 5 slide to the corresponding position of the end of the sliding track, install the trailer wheel pair corresponding to the side rails;

[0026] (20) Connect the pipeline and install the top of the reaction frame; the top of the force frame to be installed is assembled as a whole on the ground and then lowered into the well and fixedly connected to the bottom of the reaction frame;

[0027] (21) Install negative ring segments and debug the shield machine.

[0028] In some embodiments of the present disclosure, in step (1), a concrete pedestal is constructed at the bottom of the main wellhead, and embedded steel plates for fixing the reaction frame and the starting platform are arranged at corresponding positions of the concrete pedestal, and the bottom of the embedded steel plate is connected to the internal steel bars of the concrete pedestal through steel bars.

[0029] In some embodiments of the present disclosure, in step (4), before the temporary guide platform is hoisted, the elevation of the starting platform is measured, and the height difference between the starting platform and the outer surface of the ring of segments to be laid by the shield machine is calculated based on the axis of the tunnel to be excavated. Based on this, work steel of corresponding height is cut and fixed at the corresponding position of the starting platform.

[0030] In some embodiments of the present disclosure, in step (4), the temporary guide platform assembled on the ground is lowered into the well by four slings with fall chains provided between the slings and the main hoist hooks, and the spatial position of the temporary guide platform is adjusted by the fall chains so that the embedded bolt holes of the temporary guide platform segments are matched one by one with the corresponding bolts of the starting platform.

[0031] In some embodiments of the present disclosure, in step (6), four splayed bevel wheels are correspondingly installed before the rear half of trailer No. 1 is lowered into the well, and some top-level equipment is installed on the top before it is lifted down into the well and translated.

[0032] In some embodiments of the present disclosure, in step (7), two splayed bevel wheels are installed corresponding to the front half of trailer No. 1 before it is lowered into the well. After it is lowered into the well, a jack is arranged underneath it to adjust its spatial position so that it is connected with the corresponding bolts of the rear half of trailer No. 1.

[0033] In some embodiments of the present disclosure, in step (7), an auxiliary crane is set at the main wellhead, and the rear half of trailer No. 1 is lifted and adjusted in spatial position through two lifting points located at the front end of the rear half of trailer No. 1 within the range of the main wellhead, so that it is connected to the front half of trailer No. 1.

[0034] In some embodiments of the present disclosure, in step (9), the supports corresponding to the No. 4 and No. 6 shields are made of 175 or 200 steel, and a pre-embedded steel plate is provided at the corresponding position of the bottom of the well, and the supports are fixedly connected to the pre-embedded steel plate.

[0035] In some embodiments of the present disclosure, in step (9) or (10), after the support wheels are lowered into the corresponding connecting bridge, round tube piers are placed under the connecting bridge, and the support wheel pairs are welded at corresponding positions. After welding is completed, the round tube piers are removed.

[0036] In some embodiments of the present disclosure, in step (11), the main drive turning over adopts two crawler cranes as the main crane and auxiliary crane respectively. First, the two crawler cranes are lifted simultaneously to a certain height of the main drive from the ground. Then the main crane is lifted and the auxiliary crane is lowered at the same time until the auxiliary crane is completely free of force. Finally, the main crane is lowered and the auxiliary crane lifting tooling is removed and then lowered into the well for corresponding installation.

[0037] One or more technical solutions provided in the embodiments of this application have at least any of the following technical effects or advantages:

[0038] 1. The main wellhead and auxiliary wellhead are respectively equipped with the shield machine and the rear supporting trailer, which effectively increases the working surface of the shield machine hoist assembly. The hoist assembly operations at the two wellheads can be carried out simultaneously, which is conducive to improving the hoist assembly efficiency.

[0039] 2. The winch and corresponding sliding track are set up through the stepped connecting caverns, which greatly facilitates the movement of the corresponding component equipment of the shield machine in front and behind the winch, and saves the equipment displacement time.

[0040] 3. The setting of the temporary guide platform solved the problems of supporting the segment trolley and docking and moving the No. 1 trailer. The temporary guide platform was assembled on the ground in advance and lowered into the well as a whole, which greatly improved the installation efficiency.

[0041] 4. Fine-tune the front section of trailer No. 1 with a jack and use an auxiliary crane to lift and adjust the rear section of trailer No. 1. This can save trailer docking time and improve trailer installation and assembly efficiency.

[0042] 5. The remaining components except the bottom of the reaction frame are assembled on the ground and then hoisted into the well, which can reduce the frequency of high-altitude hoisting operations and save construction time.

[0043] 6. The overall process is well coordinated and the technical measures adopted are safe and appropriate, saving time and effort, and greatly shortening the installation period of the shield equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic structural diagram of a working well in one embodiment of the present application.

[0045] Figure 2 This is a schematic diagram of the process of lowering the reaction frame into the well in one embodiment of the present application.

[0046] Figure 3 This is a schematic diagram of the process of launching a downhole well in one embodiment of the present application.

[0047] Figure 4 This is a top view of the main wellhead behind the starting platform in one embodiment of the present application.

[0048] Figure 5This is a structural diagram of the temporary guide steel support in one embodiment of the present application.

[0049] Figure 6 This is a schematic diagram of the process of lowering the segment transport trolley into the well in one embodiment of the present application.

[0050] Figure 7 This is a schematic diagram of the process of hoisting the rear half of trailer No. 1 down the well in one embodiment of the present application.

[0051] Figure 8 This is a schematic diagram of the process of hoisting the front half of trailer No. 1 down the well in one embodiment of the present application.

[0052] Figure 9 This is a schematic diagram of the shield body blocks in one embodiment of the present application.

[0053] Figure 10 This is a schematic diagram of the simultaneous lowering of shield body blocks and connecting bridges into the well in one embodiment of the present application.

[0054] Figure 11 This is a schematic diagram of the process of trailer No. 5 going down the well in one embodiment of the present application.

[0055] Figure 12 This is a schematic diagram of the installation of the intermediate box culvert and side rails in one embodiment of the present application.

[0056] In the above figures, 10 is the tunnel to be excavated, 11 is the main shaft opening, 12 is the auxiliary shaft opening, 13 is the connecting cavern, 14 is the concrete cap, 21 is the winch, 22 is the sliding track, 31 is the bottom of the reaction frame, 32 is the starting platform, 33 is the temporary guide platform, 34 is the industrial steel support, 35 is the segment conveying trolley, 36 is the rear half of trailer No. 1, 37 is the front half of trailer No. 1, 38 is the bottom part of the shield, 40 is the M-beam, 41 is the front half of the connecting bridge, 42 is the rear half of the connecting bridge, 43 is trailer No. 2, 44 is trailer No. 3, 45 is trailer No. 4, 46 is trailer No. 5, 47 is the cutter head, 48 is the segment assembly machine, 50 is the intermediate box culvert, 51 is the side rail, and 52 is the trailer wheel set. DETAILED DESCRIPTION

[0057] In the description of this application, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "top," "bottom," "inner," "outer," "vertical," "horizontal," "clockwise," and "counterclockwise" indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Unless otherwise specified, terms such as "connection" and "coupling" used in this application include both direct and indirect connections (couplings).

[0058] In order to better understand the technical solution of the present application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0059] This example discloses a shield machine crane assembly method for assembling a large-diameter shield machine with an excavation diameter of 13.32 meters. The shield machine mainframe has a total length of approximately 15 meters, the entire machine has a total length of 135 meters, the mainframe weighs approximately 2027 tons, the rear supporting trailer weighs approximately 1119 tons, and the heaviest single compartment is a 461-ton cutterhead (including cutters). The rear supporting trailer consists of trailers 1 to 5 and two connecting bridges. The specific crane assembly method includes the following steps:

[0060] (1) Opening a working well, which includes a main well opening opened at the starting tunnel of the shield machine for hoisting the shield machine main body, an auxiliary well opening with a corresponding connection line parallel to the central axis of the tunnel to be excavated and used for hoisting the subsequent supporting trailer, and a connecting cavern opened between the two well openings, which is elevated in two steps from the main well opening to the auxiliary well opening.

[0061] Taking into account the complex structure of the shield machine to be hoisted, the long hoisting and assembly cycle, and the high safety risks, in order to meet the overall hoisting and assembly process of the shield and improve the assembly efficiency, the main working surface of the shield machine hoisting assembly is mainly divided into two, namely the main wellhead for hoisting the shield machine main body and the auxiliary wellhead for hoisting the subsequent supporting trailer. It also includes a connecting cavern opened between the two wellheads to facilitate the connection and fixation of various downhole equipment.

[0062] After the downhole equipment is lowered into the main wellhead or the auxiliary wellhead, it needs to be moved to facilitate the subsequent downhole of the shield machine components. Therefore, it is necessary to install a driving device to realize the movement of each component underground. For this purpose, the underground connecting cavern is designed as a two-level ladder. Figure 1 , it is lifted from the bottom of the main shaft to the bottom of the auxiliary shaft, and a driving device is set at the intersection of the two steps to realize the dragging of the shield machine components on the front and rear sides of the equipment.

[0063] In addition, considering that there is a certain height difference between the bottom surface of the main shaft and the lowest point of the tunnel to be excavated, and in order to facilitate the lowering and starting of the shield, a starting platform and a reaction frame need to be set up. Since the weight of the shield is relatively large, the starting platform and the reaction frame, which are load-bearing members, need to be firmly installed at the bottom of the main shaft. For this reason, in this embodiment, a concrete pedestal is constructed at the bottom of the main shaft mouth, and pre-embedded steel plates for fixing the reaction frame and the starting platform are arranged at the positions of the concrete pedestal corresponding to the positions of the starting platform and the reaction frame. The bottom of the pre-embedded steel plate extends the legs through steel bars and is connected to the steel bars inside the concrete pedestal.

[0064] (2) Lay out the winch and sliding track. Lay out the winch on the surface of the first step, which is relatively low and where the two steps meet. Lay out the sliding track on the surface of the second step. One end of the sliding track extends to the bottom of the auxiliary wellhead, and the other end extends to the top of the winch and covers the position of the winch.

[0065] After the corresponding components of the shield machine are lowered into the well at the main wellhead or the auxiliary wellhead, in order to facilitate the installation of subsequent components, the equipment components that have been lowered into the well need to be moved to leave corresponding positions for lowering into the wellhead. The movement of the components and equipment that have been lowered into the well requires a corresponding driving mechanism. In this embodiment, a winch is used as the driving mechanism, which is fixedly set at the junction of the two steps connecting the cavern to realize the movement of equipment components such as trailer No. 1 at the first step and the connecting bridge, other trailers and other equipment components at the second step. Among them, considering that the various downhole equipment are not equipped with wheel pairs, there is a large resistance problem during movement. Therefore, in this embodiment, a sliding track is arranged on the surface of the second step, and one end of the sliding track extends to the bottom of the auxiliary wellhead to facilitate the lowering of the corresponding equipment from the auxiliary wellhead onto the sliding track; the other end of the sliding track extends to the top of the winch and covers the position of the winch. The sliding track allows various equipment components to pass from the top of the winch to avoid interference between them, and the part of the sliding track located above the first step is perpendicular to the surface of the first step and is provided with a corresponding support frame to firmly support the sliding track and avoid bending and damage of the track.

[0066] (3) The bottom component of the reaction frame and the starting platform are placed at the main well mouth. The layout direction of the bottom component of the reaction frame and the starting platform is parallel to the axis of the tunnel to be excavated.

[0067] After the corresponding winches and sliding tracks are laid out in the working shaft, the shield machine can be hoisted. Because the shield body needs to be supported at the start to advance in the tunneling direction, a reaction frame is installed at the start position as a force support. Considering the arc-shaped surface of the shield body, a starting platform with a top that has the same arc as the shield shell is installed as the shield support structure.

[0068] Since the reaction frame consists of several components, in order to avoid the interference of the corresponding components of the reaction frame with the main shield components when going down the well, causing damage, see Figure 2 First, lower the bottom of the reaction frame to the main wellhead. To ensure that the reaction frame can provide good and stable support, the bottom of the reaction frame needs to be firmly fixed to the bottom of the main well. To this end, after the reaction frame is lowered into place, it is welded and fixed to the embedded steel plate of the concrete pedestal at the bottom of the well to ensure stable force.

[0069] See also Figure 3 After the bottom of the reaction frame is in place, the starting platform is positioned and installed in the well. The length of the starting platform is determined according to the length and center position of the shield main machine, and considering that the shield cutter head is partially embedded in the cutting ring and a curtain rubber plate is arranged at the hole, see Figure 4 The distance between the tunnel entrance and the reaction frame must be greater than the length of the starting platform, and sufficient space must be reserved for the starting platform downhole to avoid interference with the tunnel entrance structure, resulting in rework and affecting the construction progress.

[0070] (4) A temporary guide platform is hoisted on the upper surface of the starting platform; the temporary guide platform includes several segment rings, and the longitudinal seams of the several segment rings are spliced on the ground before the temporary guide platform is hoisted.

[0071] During the tunneling process of the shield machine, the tail shield assembly machine assembles segments in the tunnel after excavation for support. The rear supporting trailer equipment and other equipment run on the assembled segments. The segments are assembled inside the tail shield. As the shield machine advances, the corresponding grouting mechanism of the tail shield grouts the gap between the tunnel wall and the assembled segments to make them dense. As a result, there is a certain height difference between the shield machine shell and the assembled segments run by the rear supporting trailer. Therefore, in order to facilitate the lowering of the rear supporting trailer and its smooth translation in the direction of the auxiliary wellhead, a temporary curved guide platform needs to be built to simulate the segments assembled by the segment assembly machine and make up for the height difference between the starting platform and the running position of the rear supporting trailer. Therefore, after the starting platform is installed and fixed, the temporary guide platform is lowered and positioned.

[0072] The temporary guide platform is constructed from segment rings, sized to match the arc dimensions of the inclined wheel pair of trailer No. 1, ensuring smooth movement on the temporary guide platform. To improve construction efficiency and ensure timely completion, the temporary guide platform is assembled on the ground in advance. Each segment ring is connected by longitudinal seams and placed vertically on the ground for easy assembly. Once the segments are aligned, the guide platform is then lowered into the well. In this embodiment, to ensure the safety of the temporary guide platform during lowering, it is lowered into the well using four slings with fall chains connected to the main hoist hooks. These fall chains adjust the spatial position of the temporary guide platform so that the pre-embedded bolt holes on the segments align with the corresponding bolt holes on the launch platform, ensuring a secure installation on the launch platform. This pre-assembly of the temporary guide platform on the ground and its complete lowering prevents the need for individual segments to be lowered onto the launch platform, and prevents interference from the launch platform structure with the connections between the segments. This significantly improves the installation and lifting efficiency of the temporary guide platform and reduces construction time.

[0073] Among them, due to the grouting gap between the tail shield shell and the assembled segments, the temporary guide platform is directly placed on the starting platform. The height of the inner arc surface of the segment cannot meet the operating height requirement of trailer No. 1. Therefore, a support is fixed on the starting platform to adjust the height of the temporary guide platform. In this embodiment, see Figure 5, fix a certain height of steel support on the starting platform to increase the height of the temporary guide platform; before the temporary guide platform is hoisted, measure the elevation of the starting platform, and calculate the height difference between the starting platform and the outer surface of the shield machine segment ring to be laid according to the axis of the tunnel to be excavated. Based on this, cut the steel of the corresponding height and weld it to the starting platform. Among them, considering that the steel support is cut manually, there will be certain deviations. Therefore, during the installation and fixing process of the steel support, measurements are taken to control the height, unify the height difference, cut off the high places, and take support measures for the low places. After the temporary guide platform is installed, the inner arc surface of the temporary guide platform is tightly fitted with the trailer wheel pair, so that the trailer can be smoothly moved from the temporary guide platform by the winch.

[0074] (5) Hoisting of the segment transport trolley: hoist the segment transport trolley in sections from the main wellhead to the surface of the temporary guide platform, and use the winch to move the corresponding segment transport trolley to a certain distance in the direction of the auxiliary wellhead for subsequent segment transport trolley segment assembly.

[0075] After the temporary guide platform is fixed and installed, see Figure 6 The segment transport trolley is hoisted and lowered into the well in sections from the main wellhead. After being lowered into the well, the segment transport trolley needs to be translated in the direction of the auxiliary wellhead to leave space for hoisting at the main wellhead and facilitate the subsequent installation of equipment components. Therefore, a rubber wheel is installed at the bottom of the segment transport trolley. The angle of the rubber wheel matches the inner diameter of the temporary guide platform segment, so that the segment transport trolley can be translated along the temporary guide platform. At the same time, a steel wire rope is used to connect the segment transport trolley and the winch. The winch is used as the driving mechanism. The steel wire rope is used to pull the segment transport trolley to the auxiliary wellhead. The translation distance is sufficient to complete the connection and assembly of the remaining segment transport trolleys in the connecting cavern.

[0076] (6) Lift the rear half of trailer No. 1; lift the rear half of trailer No. 1 from the main wellhead to the surface of the temporary guide platform, and move it horizontally to the direction of the auxiliary wellhead by the winch. The translation distance must ensure that the two lifting points at the front end of trailer No. 1 are within the lifting range of the main crane and that there is space reserved for lifting the front half of trailer No. 1.

[0077] Trailer No. 1 is lowered from the main wellhead. Due to its long overall structure and heavy weight, it is hoisted in sections, starting with the rear section of trailer No. 1. Before the rear section of trailer No. 1 is lowered into the well, four splayed bevel wheels are installed on the ground at its bottom, and the top equipment on top, such as the transformer, wind tube, and cable bracket, are not assembled yet to ensure that the force angle of the hoisting wire rope does not interfere when hoisting it into the well, so as to avoid the top equipment affecting the hoisting. After the rear section of trailer No. 1 is lowered into place, see Figure 7, ensuring good contact between the splayed bevel wheel at the bottom and the temporary guide platform, and after evenly distributing the force, the corresponding large equipment such as the transformer and wind duct on the top can be installed; because the main wellhead also needs to carry out the downhole operation of the front half of trailer No. 1 and other equipment components, the rear half of trailer No. 1 is pulled horizontally toward the auxiliary wellhead by a winch, and horizontally moved to the temporary guide platform below the main wellhead to accommodate the front half of trailer No. 1. In addition, in this embodiment, considering that the spatial position of the two sections of trailer No. 1 needs to be adjusted separately when the front and rear parts of trailer No. 1 are docked, in order to improve docking efficiency and speed up construction progress, in this embodiment, after the rear half of trailer No. 1 is translated, its end near the main wellhead is exposed at the front end of the crane within the lifting range of the main wellhead. Therefore, the crane at the main wellhead can use the two lifting points at the front end of the rear half of trailer No. 1 to lift the end side of the rear half of trailer No. 1 near the main wellhead through the two lifting points, and quickly adjust the spatial position.

[0078] (7) Hoist the front half of trailer No. 1; hoist the front half of trailer No. 1 downhole from the main wellhead to the surface of the temporary guide platform, connect it to the corresponding rear half of trailer No. 1, and assemble the corresponding top-level equipment;

[0079] After the rear section of trailer No. 1 is lowered into the well and moved horizontally into position, the front section of trailer No. 1 is lowered into the well. Similarly, it is lifted from the main well mouth by a crane and lowered onto the temporary guide platform inside the main well mouth. Before the front section of trailer No. 1 is lifted into the well, two pairs of eight-shaped inclined wheels are installed at the front end of its bottom, which is the side close to the hole, as shown in the figure. Figure 8 After the installation is completed, it will be lowered into the well from the main wellhead. In order not to affect the installation of the hoisting rigging and avoid affecting the stress of the rigging, the top-level equipment will not be installed before the front half of trailer No. 1 goes into the well. It will be installed after it is lowered into the well.

[0080] Since the front section of trailer No. 1 is only equipped with two splayed bevel wheels at its end, the sling is not removed after it is lowered into position. Its spatial position is adjusted using the sling to align it with the rear section of the trailer. In this embodiment, the sling utilizes a fall chain and a connected wire rope. The fall chain is fixed relative to the crane's main hook via the wire rope, and the fall chain hook is correspondingly fixed to the trailer's lifting point. The fall chain is thus used to adjust the trailer's spatial position for easy alignment. Given the large error in adjustment using the fall chain, making it difficult to accurately align the bolted connection between the front and rear sections of trailer No. 1, a jack is installed at the rear end of the front section of trailer No. 1, near the end of the rear section, to fine-tune its spatial position.

[0081] Furthermore, to speed up the connection between the front and rear sections of trailer No. 1 and shorten the construction period, while adjusting the spatial position of the front section of trailer No. 1 using slings and jacks, the spatial position of the rear section of trailer No. 1 can be adjusted simultaneously, thereby speeding up the connection process. In this embodiment, considering that the total weight of the rear section of trailer No. 1 is close to 200 tons, using jacks for adjustment is time-consuming and labor-intensive, and it is difficult to effectively improve the connection efficiency. Therefore, in this example, an auxiliary crane is deployed at the main wellhead using two lifting points at the front end of the rear section of trailer No. 1 exposed within the range of the main wellhead to lift the rear section of trailer No. 1. In conjunction with the adjustment of the front section of trailer No. 1, this ensures that the bolts between the two sections are quickly aligned, improving the efficiency of the connection operation and saving construction period.

[0082] After the front and rear connections of trailer No. 1 are fixed, the connection area and the top equipment of the front half, such as ABB cabinets, transformers, control cabinets, air ducts, pipes, cables, etc., can be installed.

[0083] (8) Remove the temporary guide platform; start the winch to move the No. 1 trailer as a whole horizontally toward the auxiliary wellhead until the temporary guide platform is fully exposed, and then remove the temporary guide platform.

[0084] After the No. 1 trailer is installed as a whole, the winch is started to move the No. 1 trailer as a whole horizontally toward the auxiliary wellhead, leaving hoisting space for the main wellhead. At this time, the temporary guide platform arranged on the starting platform loses its function, and it only supports the segment transport trolley and the No. 1 trailer for horizontal movement down the well. Since the installation position of the shield body is in line with the guide rail on the surface of the starting platform, the temporary guide platform will interfere with the placement of the shield body below. Therefore, the No. 1 trailer as a whole is moved horizontally toward the auxiliary wellhead under the drag of the winch until the front half of the No. 1 trailer is separated from the temporary guide platform. When the temporary guide platform is fully exposed, the temporary guide platform and the corresponding steel support are removed to avoid the temporary guide platform from interfering with the installation of the shield body down the well.

[0085] (9) Hoist the bottom No. 5 shield and its corresponding No. 4 and No. 6 shields on its left and right sides in sequence; lower the bottom No. 5 shield to the corresponding position of the starting platform at the main wellhead, and reserve a distance for the installation of the cutter head and the tunnel gate steel ring; then lower the No. 4 and No. 6 shields in sequence at the main wellhead and connect and fix them with the No. 5 shield, and then provide support at the corresponding positions of the No. 4 and No. 6 shields; at the same time, lower the front part of the connecting bridge at the auxiliary wellhead, and move it horizontally in the direction of the main wellhead through the winch and sliding track; the front part of the connecting bridge is provided with a supporting wheel pair.

[0086] After the No. 1 trailer is lowered into the well, the front middle shield is hoisted and lowered into the well. Figure 9The shield body is mainly divided into 8 pieces, which are marked with numbers 1 to 8 respectively. Since the installation is carried out from the wellhead, the bottom No. 5 shield body is hoisted first, and then the bottom No. 5 shield body is lowered to the starting platform by a crane at the main wellhead. The installation position of the subsequent cutter head and the existence of the tunnel portal steel ring are taken into consideration. At the same time, the length between the shield body and the reaction frame must meet the tail shield length, ensuring that enough space is reserved in front and behind the No. 5 shield body. After the No. 5 shield body is positioned and installed, the No. 4 and No. 6 shield bodies on both sides are installed in turn. The installation of the No. 4 and No. 6 shield bodies does not distinguish between the order of priority. Before the two shield bodies are connected to the bottom No. 5 shield body respectively, the connection surface is cleaned, the circular sealing strip is installed in the sealing groove and butter is applied, and the flat sealant is applied on the connection surface. After the No. 4 and No. 6 shield bodies fall into place, the connecting bolts between them and the No. 5 shield body are pre-tightened to complete the initial connection.

[0087] Considering the heavy weight of shields No. 4 and No. 6, it is difficult to ensure a reliable and stable connection with shield No. 5 by simply bolting them together. Therefore, supports are installed below shields No. 4 and No. 6 to stabilize them. In this embodiment, 175 steel is used as the support, and steel plates are embedded during the concrete pouring at the bottom of the well. The two ends of the support are welded to the corresponding supported shield and the embedded steel plate at the bottom of the well. In other embodiments, 200 steel is used, and the support and embedded steel plates are connected by planting steel bars or using expansion bolts.

[0088] In order to improve the efficiency of shield machine assembly, when hoisting shields 5, 4 and 6 in sequence at the main shaft, the front part of the connecting bridge is lowered at the auxiliary shaft at the same time. Figure 10 During actual shield machine excavation, the connecting bridge is connected to the front and rear supporting trailers or the main machine and trailer, and its bottom is unsupported. After it is lowered through the auxiliary shaft, in order to connect with the No. 1 trailer and avoid affecting the lowering of subsequent equipment components at the auxiliary shaft, it needs to be translated toward the main shaft. To facilitate translation, four supporting wheel pairs that match the sliding track are provided at the bottom of the connecting bridge to facilitate the movement of the connecting bridge on the sliding track. In this embodiment, to improve the efficiency of shield machine hoisting, a welded supporting wheel pair is pre-installed on the ground at the bottom of the connecting bridge before the connecting bridge is lowered into the shaft. In other embodiments, the supporting wheel pair is welded and installed after the connecting bridge is lowered into the shaft, and a circular tube pier is placed at the bottom of the auxiliary shaft. The front part of the connecting bridge is correspondingly placed on the circular tube pier, and then the supporting wheel pair is welded. After the welding of the supporting wheel pair is completed, the circular tube pier is removed. The winch then drags the front of the connecting bridge along the sliding track toward the main wellhead, with its tail as close to the auxiliary wellhead as possible without interfering with subsequent lifting operations at the auxiliary wellhead.

[0089] (10) Lower the M-shaped beam and the rear part of the connecting bridge into the well; lower the M-shaped beam from the main well mouth and fix it to the corresponding shields 5, 4 and 6; at the same time, lower the rear part of the connecting bridge into the well at the auxiliary well mouth and move it horizontally in the direction of the main well mouth through the winch and sliding track to connect with the corresponding front part of the connecting bridge; a supporting wheel set is provided at the rear of the connecting bridge.

[0090] See also Figure 9 The M-beam is located in the center of the shield body and is connected to each shield block. Therefore, after the No. 5, 4, and 6 shields are lowered into the well and positioned, the M-beam is lowered into the well to avoid interference with the lowering of the M-beam by lowering the subsequent shield blocks into the well first. After lowering the M-beam from the main wellhead to the corresponding connection position on the inner arc surface of the No. 4, 5, and 6 shields, it is positioned and installed. At the same time, to improve the lifting efficiency, the rear part of the connecting bridge is lowered from the auxiliary wellhead. The rear end of the bottom of the rear part of the connecting bridge, that is, the bottom of the end away from the main wellhead, is provided with two supporting wheel pairs using the same method as the front part of the connecting bridge. In order to improve efficiency and avoid welding too many supporting wheel pairs and subsequent dismantling operations that occupy construction time, the tail of the front part of the connecting bridge has been moved forward to a corresponding position close to the auxiliary wellhead and does not affect the operation of the auxiliary wellhead. Therefore, only two supporting wheel pairs are provided at the rear end of the rear part of the connecting bridge. The front end is connected to the front end of the connecting bridge through the drive of the winch. This saves the time for installing and dismantling the two wheel pairs, which can further improve efficiency. In addition, after the connecting bridge is connected as a whole, continue to operate the winch to make it move forward until the connecting bridge is connected to the No. 1 trailer.

[0091] (11) Main drive is lowered into the well; the main drive is lowered into the well from the main wellhead through the main drive turning frame and fixedly connected to the corresponding shields 5, 4 and 6;

[0092] Since the main drive is also located within the shield, it must be hoisted and lowered into the well before the top shield is lowered into the well. Because the main drive is heavy and is transported horizontally, it must be installed upright after being lowered into the well, requiring a turnover. In this example, two crawler cranes serve as the main and auxiliary cranes, respectively. First, the two crawler cranes simultaneously lift the main drive to a certain height above the ground. The main crane then rises while the auxiliary crane lowers until the auxiliary crane is completely free of stress. Finally, the main crane is lowered, the auxiliary crane's lifting fixtures are removed, and the main drive is then lowered into the well for installation. Before the main drive is lowered into the well, the connection surfaces and sealing grooves are cleaned to ensure they are spotless. Once positioned, it is connected to the bottom shields 5, 4, and 6, and the connecting bolts are pre-tightened.

[0093] (12) Shields No. 3 and No. 7 are lowered into the main well mouth in sequence and fixed accordingly; at the same time, trailer No. 2 with a corresponding slider welded on the bottom is lowered from the auxiliary well mouth, and is moved horizontally in the direction of the main well mouth through a winch and a sliding track to connect with the rear part of the connecting bridge.

[0094] After the M-shaped beam and main drive are installed inside the shield, the various blocks on the top of the shield are installed. Shields No. 3 and No. 7 are hoisted down the well from the main wellhead in sequence and connected to shields No. 4 and No. 6 respectively, and the connecting bolts are pre-tightened.

[0095] While shields No. 3 and No. 7 were being lowered into the main wellbore, trailer No. 2 was also being lowered into the auxiliary wellbore to improve lifting efficiency. The connecting cavern was designed in a stepped shape to reduce excavation and accommodate the layout of equipment such as winches. As a result, after the supporting trailers were lowered into the auxiliary wellbore, the height of the connecting cavern was insufficient to accommodate the wheelset installation requirements. Therefore, trailers No. 2, 3, 4, and 5 were not equipped with wheelsets before being lowered into the wellbore. However, to avoid occupying wellbore operating space after being lowered, they required translation. Therefore, sliders matching the sliding tracks were welded to the bottom of each supporting trailer to ensure smooth translation. After trailer No. 2 was lowered into the wellbore and its bottom slider was placed on the sliding track, the winch was used to slide trailer No. 2 onto the sliding track until it connected to the rear end of the connecting bridge.

[0096] (13) Lower the side blocks No. 2 and No. 8 shields and the top block No. 1 shield in turn from the main well mouth and fix them in place accordingly; at the same time, lower the No. 3 trailer with a slider welded on the bottom from the auxiliary well mouth and move it horizontally in the direction of the main well mouth through the winch and sliding track until it is connected to the No. 2 trailer.

[0097] Finally, the top shield was installed. Shields No. 2 and 8 were lowered sequentially from the main wellhead, and the corresponding connecting bolts with shields No. 3 and 7 were pre-tightened for initial secure connection. Similarly, to speed up assembly efficiency, trailer No. 3 was lowered and moved horizontally from the auxiliary wellhead. Four sliders matching the sliding tracks were welded to the bottom of the steel structure of trailer No. 3. After trailer No. 3 was lowered into the well, the sliders were placed on the sliding tracks so that the trailer could be dragged along the sliding tracks by the winch and connected to the rear of trailer No. 2, leaving a wellhead position.

[0098] (14) Lower the tail shield bottom block at the main wellhead and connect it to the shield body, and then lower the well segment installation machine from the main wellhead and connect it to the M-beam.

[0099] After the top blocks of the shield are lowered through the main wellbore and secured, the shield installation is complete, and the tail shield is then lowered and assembled. The tail shield consists of four main parts: a base block at the bottom, left and right side blocks on the left and right sides, and a top block at the top. The bottom block is lowered first. Once it is accurately positioned using instrumentation, it is spot-welded to the shield body. The internal mechanical equipment of the tail shield is then hoisted and lowered into the well. The segment installation machine is lowered through the main wellbore and secured to the shield's M-shaped beams.

[0100] (15) Installation of the cutterhead in the well: After the cutterhead is welded on the ground, two crawler cranes are set up as the main crane and auxiliary crane to help turn the cutterhead over, and the lifting ears at the bottom of the cutterhead are removed before assembly and installation in the well.

[0101] The cutterhead is assembled and welded on the ground in advance. After the assembly and welding are completed, the cutterhead is lowered into the well from the main wellhead for installation. To facilitate the welding operation, the cutterhead lies flat on the ground and is parallel to the ground. The cutterhead is in a vertical state in the shield machine. Therefore, the cutterhead needs to be turned over before it can be lowered into the well. In this embodiment, two cranes are used, respectively as the main crane and the auxiliary crane to perform the turning operation of the cutterhead. First, the two crawler cranes slowly lift the cutterhead parallel to the ground through the slings inserted in the lifting ears on both sides of the cutterhead. After it is raised to a height exceeding the diameter of the cutterhead, the auxiliary crane gradually falls, and the main crane continues to lift. After the auxiliary crane sling is no longer under stress, the connection between the auxiliary crane sling and the cutterhead is disconnected, the lifting ears at the bottom of the cutterhead are removed, and the cutterhead is lowered into the well from the main wellhead for alignment and installation by the main crane.

[0102] (16) The remaining three tail shields are lowered into the well in sequence and installed. At the same time, trailer No. 4 with a corresponding slider welded on the bottom is lowered into the auxiliary wellhead and moved horizontally in the direction of the main wellhead through a winch and a sliding track until it is connected to trailer No. 3.

[0103] The remaining three pieces of the tail shield are installed after being aligned and fixed by the segment assembly machine. They are then lowered into the well from the main wellhead in sequence and aligned with the tail shield bottom piece. At the same time, their roundness is measured in sections. If it is outside the allowable error, it needs to be corrected to ensure that the error is within the allowable range. Then, according to the tail shield welding plan, the tail shield circumferential seam is welded and the longitudinal seam is welded to the shield body. At the same time, the No. 4 trailer is lowered into the well from the auxiliary wellhead. Similarly, a corresponding slider is welded to the bottom of the steel structure of the No. 4 trailer. After being lowered into the well, the slider is placed on the sliding track and slides along the sliding track, realizing the translation of the No. 4 trailer under the pull of the winch, and then connected to the tail of the No. 3 trailer, leaving the auxiliary wellhead position.

[0104] (17) Trailer No. 5 with a corresponding slider welded on the bottom is lowered to the auxiliary wellhead, and is moved horizontally in the direction of the main wellhead through a winch and a sliding track until it is connected to trailer No. 4.

[0105] See also Figure 11 The last trailer, No. 5, is lowered into the well from the auxiliary wellhead. Similarly, the corresponding slider is welded on its bottom steel structure, and it is moved horizontally along the sliding track through the winch and sliding track to the corresponding connection with the tail of trailer No. 4.

[0106] (18) Start the two sets of thrust cylinders at the bottom of the shield machine and move the shield forward until the cutterhead and the tunnel door seal are in contact.

[0107] Because the thickness of the cutterhead and the width of the tunnel portal steel ring are taken into consideration when the shield is installed, a certain distance is left between the shield and the tunnel portal to facilitate the installation of the cutterhead downhole, thereby creating a gap between the cutterhead and the tunnel portal. To this end, the two sets of thrust cylinders at the bottom of the shield machine are started to move the shield forward a certain distance along the starting platform, thereby sealing the cutterhead against the tunnel portal.

[0108] (19) Move trailer No. 1 forward to connect with the shield machine, and install side rails on both sides of the middle box culvert from the auxiliary shaft mouth to the connecting bridge area, corresponding to the step position of the connecting cavern. After trailers No. 2, 3, 4, and 5 slide to the corresponding position of the end of the sliding track, install the trailer wheel pair corresponding to the side rails.

[0109] After the tail shield and its internal segment assembly machine are installed, the rear supporting equipment needs to be connected to it. The No. 1 trailer and the subsequent connecting bridge and other trailers are pulled by the winch to connect them to the shield main machine to form a whole. However, considering that the connecting cavern has a stepped structure to reduce the amount of excavation, when the rear supporting trailer moves forward through the stepped structure and runs to the end of the sliding track, it can no longer rely on the cooperation between the slider and the sliding track to continue moving forward. Therefore, in this embodiment, see Figure 12 When the rear supporting trailer moves forward in the direction of the main wellhead, the middle box culvert is lowered from the auxiliary wellhead and transported to the connecting bridge area through the crane beams on the connecting bridge, trailer No. 2 and trailer No. 3 to the stepped position corresponding to the connecting cavern for assembly, and side rails are laid on both sides of the middle box culvert. When the connecting bridge runs to the box culvert position and detaches from the sliding track, the supporting wheel pairs at its bottom are removed; when the rear supporting trailers No. 2, 3, 4, and 5 run to the end of the sliding track and detach from the sliding track, the trailer wheel pairs at the bottom of each trailer are installed accordingly, so that they continue to move along the side rails laid subsequently, thereby solving the problem of the rear supporting trailer moving at the stepped structure caused by the stepped structure of the connecting cavern.

[0110] (20) Connect the pipeline and install the top of the reaction frame; the top of the force frame to be installed is assembled as a whole on the ground and then lowered into the well and fixedly connected to the bottom of the reaction frame.

[0111] Connect the pipelines of each shield machine component equipment and install the top of the reaction frame. In addition to the bottom of the reaction frame that has been lowered into the well, there are still many components remaining. These remaining components are installed on the ground. After the ground assembly is completed, they are lowered into the well and installed corresponding to the bottom of the reaction frame. This reduces the frequency of high-altitude operations, shortens the lifting operation time, improves safety, and effectively shortens the construction period.

[0112] (21) Install negative ring segments and debug the shield machine.

[0113] Finally, install the negative ring segment. When the entire ring is installed, push it until the top of the segment rests on the reaction frame.

[0114] Although some preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0115] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of the invention. Thus, if such changes and modifications to this application fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A shield machine crane assembly method, characterized in that: The steps include: (1) Opening a working well, including a main well opening at the starting tunnel of the shield machine for hoisting the shield machine, an auxiliary well opening with a corresponding connection line parallel to the central axis of the tunnel to be excavated and for hoisting the subsequent supporting trailer, and a connecting cavern opened between the two well openings, with a two-step elevation from the main well opening to the auxiliary well opening; (2) A winch is arranged on the surface of the first step which is relatively low and is located at the junction of the two steps; a sliding track is arranged on the surface of the second step, with one end of the sliding track extending below the auxiliary wellhead and the other end extending above the winch and covering the position of the winch; (3) Lowering the bottom component of the reaction frame and the starting platform at the main wellhead, wherein the bottom component of the reaction frame and the starting platform are arranged in a direction parallel to the central axis of the tunnel to be excavated; (4) hoisting a temporary guide platform on the starting platform; the temporary guide platform includes a plurality of segment rings, and the longitudinal seams of the plurality of segment rings are spliced on the ground before the temporary guide platform is hoisted; (5) The segment transport trolleys are hoisted in sections from the main wellhead to the temporary guide platform, and the segment transport trolleys of the corresponding sections are moved horizontally by the winch to a certain distance in the direction of the auxiliary wellhead for subsequent segment transport trolley segment assembly; (6) The rear half of trailer No. 1 is hoisted from the main wellhead to the temporary guide platform, and is pulled and moved to the auxiliary wellhead direction by the winch, and the translation distance is such that the two lifting points at the front end of trailer No. 1 are within the lifting range of the main hoist and there is space reserved for the hoisting of the front half of trailer No. 1; (7) Hoist the front half of trailer No. 1 downhole from the main wellhead to the temporary guide platform, connect it to the rear half of trailer No. 1, and assemble the corresponding top-level equipment; (8) Start the winch to move the No. 1 trailer as a whole to the direction of the auxiliary wellhead until the temporary guide platform is fully exposed, and then remove the temporary guide platform; (9) Lower the bottom No. 5 shield at the main wellhead to the corresponding position of the starting platform, and reserve the distance for the cutter head and the tunnel gate steel ring. Then, lower the No. 4 and No. 6 shields in sequence at the main wellhead and connect and fix them between the No. 5 shields. Then, support the No. 4 and No. 6 shields at the corresponding positions. At the same time, lower the front part of the connecting bridge at the auxiliary wellhead and move it horizontally in the direction of the main wellhead through the winch and the sliding track. The front part of the connecting bridge is provided with a supporting wheel pair. (10) Lower the M-shaped beam from the main wellhead and fix it to the No. 5, 4, and 6 shields; at the same time, lower the rear part of the connecting bridge at the auxiliary wellhead and move it horizontally in the direction of the main wellhead through the winch and the sliding track to connect it to the front part of the connecting bridge; the rear part of the connecting bridge is provided with a supporting wheel pair; (11) The main drive is lowered from the main wellhead through the main drive turning frame and fixedly connected to the shields No. 5, 4, and 6; (12) Shields No. 3 and No. 7 are lowered into the main well mouth in sequence and fixed accordingly; at the same time, trailer No. 2 with a corresponding slider welded on the bottom is lowered from the auxiliary well mouth, and is moved horizontally in the direction of the main well mouth through the winch and the sliding track to connect with the rear part of the connecting bridge; (13) Lower the side blocks 2 and 8 shields and the top block 1 shield in sequence from the main wellhead and fix them accordingly; at the same time, lower the trailer 3 with a corresponding slider welded on the bottom from the auxiliary wellhead and move it horizontally in the direction of the main wellhead through the winch and the sliding track until it is connected to the trailer 2; (14) Lower the tail shield bottom block at the main wellhead and connect it to the shield body, and lower the well segment installation machine from the main wellhead and connect it to the M-beam; (15) After the cutterhead is assembled and welded on the ground, two crawler cranes are set up as the main crane and auxiliary crane to help turn the cutterhead over, and the bottom lifting lugs of the cutterhead are removed before assembly and installation in the well. (16) The remaining three tail shields are lowered into the well in sequence and installed. At the same time, trailer No. 4 with a corresponding slider welded to the bottom is lowered from the auxiliary wellhead and moved horizontally in the direction of the main wellhead through a winch and a sliding track until it is connected to the corresponding trailer No.

3. (17) Lower trailer No. 5 with a corresponding slider welded on the bottom at the auxiliary wellhead, and move it horizontally in the direction of the main wellhead through the winch and sliding track until it is connected to the corresponding trailer No. 4; (18) Start the two thrust cylinders at the bottom of the shield machine and move the shield forward until the cutterhead and the tunnel door seal are in contact; (19) Move trailer No. 1 forward to connect it to the shield machine, and install side rails on both sides of the middle box culvert from the auxiliary shaft mouth to the connecting bridge area corresponding to the connecting cavern step position; and after trailers No. 2, 3, 4, and 5 slide to the corresponding position of the end of the sliding track, install the trailer wheel pair corresponding to the side rails; (20) Connect the pipeline and install the top of the reaction frame; after the top of the reaction frame is assembled on the ground, it is lowered into the well and fixedly connected to the bottom of the reaction frame; (21) Install negative ring segments and debug the shield machine.

2. The shield machine crane assembly method according to claim 1, characterized in that: In the step (1), a concrete pedestal is constructed at the bottom of the main wellhead, and an embedded steel plate for fixing the reaction frame and the starting platform is arranged at a corresponding position of the concrete pedestal. The bottom of the embedded steel plate is connected to the internal steel bars of the concrete pedestal through steel bars.

3. The shield machine crane assembly method according to claim 1, characterized in that: In step (4), before the temporary guide platform is hoisted, the elevation of the starting platform is measured, and the height difference between the starting platform and the outer surface of the shield machine segment ring to be laid is calculated based on the axis of the tunnel to be excavated. Based on this, the steel of the corresponding height is cut and fixed at the corresponding position of the starting platform.

4. The shield machine crane assembly method according to claim 1, characterized in that: In step (4), the temporary guide platform assembled on the ground is lowered into the well by four slings with fall chains between the main hoist hooks, and the spatial position of the temporary guide platform is adjusted by the fall chains so that the embedded bolt holes of the temporary guide platform segments are matched one by one with the corresponding bolts of the starting platform.

5. The shield machine crane assembly method according to claim 1, characterized in that: In step (6), four splayed bevel wheels are installed before the rear half of trailer No. 1 is lowered into the well, and some top-level equipment is installed on the top before it is lifted down into the well and moved horizontally.

6. The shield machine crane assembly method according to claim 1, characterized in that: In step (7), two splayed bevel wheels are installed corresponding to the front half of trailer No. 1 before it is lowered into the well. After it is lowered into the well, a jack is arranged below it to adjust its spatial position so that it is connected with the corresponding bolts of the rear half of trailer No.

1.

7. The shield machine crane assembly method according to claim 6, characterized in that: In step (7), an auxiliary crane is set at the main wellhead, and the rear half of trailer No. 1 is lifted and adjusted in spatial position through two lifting points set at the front end of the rear half of trailer No. 1 within the range of the main wellhead, so that it is connected to the front half of trailer No.

1.

8. The shield machine crane assembly method according to claim 1, characterized in that: In step (9), the supports corresponding to the No. 4 and No. 6 shields are made of 175 or 200 steel, and a pre-buried steel plate is provided at the corresponding position of the bottom of the well, and the supports are fixedly connected to the pre-buried steel plate.

9. The shield machine crane assembly method according to claim 1, characterized in that: In the step (9) or (10), after the supporting wheels are lowered into the corresponding connecting bridge, round tube piers are placed under the connecting bridge, and supporting wheel pairs are welded at corresponding positions. After welding is completed, the round tube piers are removed.

10. The shield machine crane assembly method according to claim 1, characterized in that: In the step (11), the main drive turning over adopts two crawler cranes as the main crane and auxiliary crane respectively. First, the two crawler cranes are lifted simultaneously to a certain height of the main drive from the ground. Then the main crane is lifted and the auxiliary crane is lowered at the same time until the auxiliary crane is completely free of force. Finally, the main crane is lowered and the auxiliary crane lifting tooling is removed and then lowered into the well for corresponding installation.

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