Split assembly launching construction method for super-large-diameter shield

Abstract

The invention discloses an ultra-large-diameter shield split assembly starting construction method which comprises the following steps: S1, building a shield well at a specified position, and arranging a shield split starting assembly site outside the shield well; and S2, construction is conducted in a staged tunneling mode, and the staged tunneling mode comprises a first split tunneling stage and a second split tunneling stage. In the first stage, a tunnel is initially tunneled through a shield tunneling machine main machine and a temporary trolley, and the tunnelling length is h1; in the second stage, the tunnel is subjected to secondary tunneling through the shield tunneling machine main machine, the first trolley, the connecting bridge and the second trolley, and the tunneling length is h2; and S3, after split tunneling is conducted to h1 + h2, construction is conducted in a complete machine tunneling mode, the tunnel is tunneled through the shield tunneling machine main machine and the first trolley, the second trolley, the third trolley and the fourth trolley, and the tunneling length is h3 till tunnel construction is completed. The method is suitable for large-diameter shield tunnel engineering, the starting problem of the super-large-diameter shield tunneling machine under the condition that the construction space is limited is effectively solved, and the construction efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the field of tunnel engineering construction, in particular to an initial construction method for assembling super-large diameter shield parts. Background Art

[0002] Ultra-large diameter shield tunnel construction technology is one of the important research directions in modern tunnel engineering and is widely used in urban rail transit and long-distance tunnel construction. With the acceleration of urbanization, the demand for ultra-large diameter tunnels is growing. However, the challenges faced during construction are also increasing, especially when the construction space is limited. The existing shield starting construction methods mainly include whole machine assembly and overall excavation. Although they are suitable for conventional construction conditions, they have shortcomings when dealing with limited construction space, such as high construction difficulty, high risk and great impact on the surrounding environment. The traditional whole machine assembly method is difficult to solve the transportation and assembly problems of ultra-large diameter shield machines, and when the construction space is limited, it is easy to cause problems such as obstruction of shield machine advancement and low excavation efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a super-large diameter shield split assembly initial construction method, comprising the following steps:

[0004] S1. Build a shield shaft at the designated location and arrange a shield assembly site outside the shield shaft as a temporary equipment storage site and a shaft lowering site;

[0005] S2. Construction is carried out by adopting a phased excavation method, including the first phase of split excavation and the second phase of split excavation;

[0006] The first stage of split tunneling includes the following steps:

[0007] 1) Lift the components of the shield machine mainframe and temporary trolley one by one into the well and assemble them underground. After the assembly is completed, connect the temporary trolley to the shield machine mainframe;

[0008] 2) The shield machine and temporary trolley carry out initial tunnel excavation, and the excavation length is h1;

[0009] The second phase of split tunneling includes the following steps:

[0010] 1) The temporary trolley is returned to the shaft, and the No. 1 trolley, the connecting bridge, and the No. 2 trolley assembled at the shield split assembly site are hoisted down the shaft in sequence;

[0011] After the No. 1 and No. 2 trolleys are lowered into the well, they move into the tunnel gate and connect with the connecting bridge at the tunnel gate. Then, they move as a whole to h1 and connect with the main engine.

[0012] 2) The shield machine, trolley No. 1, connecting bridge and trolley No. 2 carry out secondary excavation of the tunnel, and the excavation length is h2;

[0013] S3. After the split excavation reaches h1+h2, the No. 3 trolley, No. 4 trolley and the tail wind tube platform assembled at the shield split assembly site will be hoisted down the well in sequence and then connected to the shield machine host respectively;

[0014] S4. After the connection is completed, the whole machine excavation method is adopted for construction. The main shield machine and trolleys 1, 2, 3 and 4 excavate the tunnel with an excavation length of h3 until the tunnel construction is completed.

[0015] Furthermore, the shield split start assembly site includes the shield shaft ground and the open cut section ground;

[0016] The ground surface of the shield shaft is used as the site for assembling the cutter head and lowering the shield body into the shaft before the separation starts; after the separation starts, it serves as the site for lowering the subsequent trolley into the shaft.

[0017] The ground of the open cut section is used as a storage place for trolleys, pipe segments and box culverts during the initial separation.

[0018] Furthermore, the components of the shield machine main body include the reaction frame bottom block, the front middle shield lower block, the main drive, the M-beam, the front middle shield upper block, the cutter head, the tail shield bottom block, the assembler, the screw machine and the left and right top blocks of the tail shield, which are lowered into the well in sequence.

[0019] Furthermore, h1 ranges from 0 to 65 m, h2 ranges from 65 to 125 m, h3 ranges from 125 m to h, and h1+h2+h3=h, where h is the total length of the tunnel.

[0020] Further, the first stage of split excavation includes the following steps:

[0021] 1.1) Excavation is carried out by the shield machine mainframe and temporary trolley;

[0022] 1.2) During the excavation process, after the screw conveyor discharges the slag in the excavation chamber of the shield machine, the discharged slag is transferred to the horizontal belt conveyor through a temporary trolley. The horizontal belt conveyor transports the slag to the ground slag transfer and distribution machine, and finally the ground slag transfer and distribution machine transports the slag to the slag pit;

[0023] 1.3) When the tunneling reaches normal state, transport and assemble the segments;

[0024] 1.4) During the excavation process, the slurry is pumped to the slurry storage tank of the temporary trolley through the pump pipe, and then the temporary trolley performs synchronous grouting.

[0025] Furthermore, the transportation and assembly of the segments in step 1.3) includes the following steps:

[0026] 1.3.1) Use a forklift to transport the pipe segments to the newly added lifting holes of the isolation piles;

[0027] 1.3.2) Use a gantry crane to vertically lower the pipe segments into the well and lift them vertically onto the diesel platform in the well;

[0028] 1.3.3) Use diesel flatbed to transport the pipe segments horizontally in the tunnel to the assembly machine.

[0029] Further, the second stage of split excavation includes the following steps:

[0030] 2.1) When the shield machine and temporary trolley have advanced to h1, the shield machine, trolley No. 1, connecting bridge and trolley No. 2 will continue to advance, and the box culvert parts will be assembled at the shield split assembly site;

[0031] 2.2) During the excavation process, after the screw conveyor discharges the slag in the excavation chamber of the shield machine, the discharged slag is transferred to the horizontal belt conveyor through the No. 1 and No. 2 trolleys. The horizontal belt conveyor transports the slag to the ground slag transfer and distribution machine, and finally the ground slag transfer and distribution machine transports the slag to the slag pit;

[0032] 2.3) When the tunneling reaches normal state, transport and assemble the segments;

[0033] 2.4) During the excavation process, the slurry is pumped to the slurry storage tank of trolley No. 1 through the pump pipe, and trolley No. 1 performs synchronous grouting.

[0034] Furthermore, the transportation and assembly of the segments in step 2.3) includes the following steps:

[0035] 2.3.1) Use a forklift to transport the pipe segments to the newly added lifting holes of the isolation piles;

[0036] 2.3.2) Use a gantry crane to vertically lower the pipe segments into the well and transport them vertically to the double-headed car in the well;

[0037] 2.3.3) Use double-headed vehicles to transport the segments horizontally in the tunnel to the assembly machine.

[0038] Furthermore, in the synchronous grouting process, a dual index control standard of grouting pressure and grouting volume is adopted, that is, when the grouting pressure reaches the set value and the grouting volume reaches more than 90% of the design value, the quality requirement is met.

[0039] Furthermore, the synchronous grouting adopts the double-liquid grouting method.

[0040] The technical effect of the present invention is unquestionable, and the beneficial effects of the present invention are as follows:

[0041] Firstly, the split assembly technology enables construction equipment to enter the construction site flexibly, greatly improving the operability of the construction. Secondly, the phased excavation construction plan is adopted, and the shield construction is divided into multiple stages, which effectively solves the problem of starting the super-large diameter shield machine under the condition of limited construction space. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the starting space for the split assembly of the super-large diameter shield machine of the present invention (the dotted lines in the working shaft are schematic diagrams of the dimensions for equipment hoisting and material transportation).

[0043] Figure 2 It is a schematic diagram of the process of the present invention.

[0044] In the figure: 1- shield shaft surface, 2- open cut section surface, 3- shield shaft, 4- first stage split excavation, 5- second stage split excavation, 6- whole machine excavation. DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with the embodiments, but it should not be understood that the above subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, various substitutions and changes are made according to the common technical knowledge and customary means in the art, which should all be included in the protection scope of the present invention.

[0046] Embodiment 1:

[0047] A super-large diameter shield split assembly initial construction method, comprising the following steps:

[0048] S1. Build a shield shaft 3 at a designated location, and arrange a shield split assembly site outside the shield shaft 3 as a temporary equipment storage site and a site for going down into the shaft;

[0049] S2. Construction is carried out by adopting a phased excavation method, including the first phase of split excavation and the second phase of split excavation;

[0050] The first stage of split tunneling includes the following steps:

[0051] 1) Lift the components of the shield machine mainframe and temporary trolley one by one into the well and assemble them underground. After the assembly is completed, connect the temporary trolley to the shield machine mainframe;

[0052] 2) The shield machine and temporary trolley carry out initial tunnel excavation, and the excavation length is h1;

[0053] The second phase of split tunneling includes the following steps:

[0054] 1) The temporary trolley is returned to the shaft, and the No. 1 trolley, the connecting bridge, and the No. 2 trolley assembled at the shield split assembly site are hoisted down the shaft in sequence;

[0055] After the No. 1 and No. 2 trolleys are lowered into the well, they move into the tunnel gate and connect with the connecting bridge at the tunnel gate. Then, they move as a whole to h1 and connect with the main engine.

[0056] 2) The shield machine, trolley No. 1, connecting bridge and trolley No. 2 carry out secondary excavation of the tunnel, and the excavation length is h2;

[0057] S3. After the split excavation reaches h1+h2, the No. 3 trolley, No. 4 trolley and the tail wind tube platform assembled at the shield split assembly site will be hoisted down the well in sequence and then connected to the shield machine host respectively;

[0058] S4. After the connection is completed, the whole machine excavation method is adopted for construction. The main shield machine and trolleys 1, 2, 3 and 4 excavate the tunnel with an excavation length of h3 until the tunnel construction is completed.

[0059] Embodiment 2:

[0060] The main structure of this embodiment is the same as that of Embodiment 1. Furthermore, the shield split starting assembly site includes the shield shaft ground 1 and the open cut section ground 2.

[0061] The shield shaft surface 1 is used as the site for assembling the cutter head and lowering the shield body into the shaft before the separation starts; after the separation starts, it serves as the site for lowering the subsequent trolley into the shaft.

[0062] The open cut section ground 2 is used as a storage place for trolleys, pipe segments and box culverts during the initial separation.

[0063] Embodiment 3:

[0064] The main structure of this embodiment is the same as any one of Embodiments 1 to 2. Furthermore, the components of the shield machine main unit include a reaction frame bottom block, a front middle shield lower block, a main drive, a M-beam, a front middle shield upper block, a cutter head, a tail shield bottom block, an assembler, a screw machine, and left and right top blocks of the tail shield, which are sequentially lowered into the well.

[0065] The assembly process of the shield machine main unit is as follows: welding of the cutterhead → lowering of the reaction frame bottom block → lowering of the front middle shield lower block → lowering of the main drive and the M-beam → lowering of the front middle shield upper block → lowering of the cutterhead → welding between shield blocks → moving the main unit forward → lowering of the tail shield bottom block → lowering of the assembler → lowering of the screw machine for installation → lowering of the left and right top blocks of the tail shield → welding of the shield tail brush → installation of the reaction frame → commissioning and acceptance of the entire machine.

[0066] Embodiment 4:

[0067] The main structure of this embodiment is the same as any one of Embodiments 1 to 3. Furthermore, h1 ranges from 0 to 65 m, h2 ranges from 65 to 125 m, h3 ranges from 125 m to h, and h1+h2+h3=h, where h is the total length of the tunnel.

[0068] Among them, the specific length of split excavation needs to be determined according to the specific project.

[0069] Embodiment 5:

[0070] The main structure of this embodiment is the same as any one of Embodiments 1 to 4. Furthermore, the first stage of split excavation includes the following steps:

[0071] 1.1) Excavation is carried out by the shield machine mainframe and temporary trolley;

[0072] 1.2) During the excavation process, after the screw conveyor discharges the slag in the excavation chamber of the shield machine, the discharged slag is transferred to the horizontal belt conveyor through a temporary trolley. The horizontal belt conveyor transports the slag to the ground slag transfer and distribution machine, and finally the ground slag transfer and distribution machine transports the slag to the slag pit;

[0073] 1.3) When the tunneling reaches normal state, transport and assemble the segments;

[0074] 1.4) During the excavation process, the slurry is pumped to the slurry storage tank of the temporary trolley through the pump pipe, and then the temporary trolley performs synchronous grouting.

[0075] Embodiment 6:

[0076] The main structure of this embodiment is the same as that of Embodiment 5. Furthermore, the transportation and assembly of the segments in step 1.3) includes the following steps:

[0077] 1.3.1) Use a forklift to transport the pipe segments to the newly added lifting holes of the isolation piles;

[0078] 1.3.2) Use a gantry crane to vertically lower the pipe segments into the well and lift them vertically onto the diesel platform in the well;

[0079] 1.3.3) Use diesel flatbed to transport the pipe segments horizontally in the tunnel to the assembly machine.

[0080] Embodiment 7:

[0081] The main structure of this embodiment is the same as any one of Embodiments 1 to 6. Furthermore, the second stage of split excavation includes the following steps:

[0082] 2.1) When the shield machine and temporary trolley have advanced to h1, the shield machine, trolley No. 1, connecting bridge and trolley No. 2 will continue to advance, and the box culvert parts will be assembled at the shield split assembly site;

[0083] 2.2) During the excavation process, after the screw conveyor discharges the slag in the excavation chamber of the shield machine, the discharged slag is transferred to the horizontal belt conveyor through the No. 1 and No. 2 trolleys. The horizontal belt conveyor transports the slag to the ground slag transfer and distribution machine, and finally the ground slag transfer and distribution machine transports the slag to the slag pit;

[0084] 2.3) When the tunneling reaches normal state, transport and assemble the segments;

[0085] 2.4) During the excavation process, the slurry is pumped to the slurry storage tank of trolley No. 1 through the pump pipe, and trolley No. 1 performs synchronous grouting.

[0086] Embodiment 8:

[0087] The main structure of this embodiment is the same as that of Embodiment 7. Furthermore, the transportation and assembly of the segments in step 2.3) includes the following steps:

[0088] 2.3.1) Use a forklift to transport the pipe segments to the newly added lifting holes of the isolation piles;

[0089] 2.3.2) Use a gantry crane to vertically lower the pipe segments into the well and transport them vertically to the double-headed car in the well;

[0090] 2.3.3) Use double-headed vehicles to transport the segments horizontally in the tunnel to the assembly machine.

[0091] Embodiment 9:

[0092] The main structure of this embodiment is the same as any one of Embodiments 4 to 8. Furthermore, in the synchronous grouting process, a dual-index control standard of grouting pressure and grouting volume is adopted, that is, when the grouting pressure reaches the set value and the grouting volume reaches more than 90% of the design value, the quality requirements are met.

[0093] During the synchronous grouting process, the grouting pressure is 1.5 to 2 times the static water and soil pressure (the static water and soil pressure depends on the maximum head height of the tunnel in the initial stage).

[0094] The design value of grouting volume is based on the formula:

[0095]

[0096] Wherein: D---shield machine cutting diameter, which is φ14500mm in this embodiment.

[0097] d---segment outer diameter, which is 14000mm in this embodiment.

[0098] L---segment width, which is 2000mm in this embodiment.

[0099] λ---Grouting ratio (generally 1.1~1.2).

[0100] Embodiment 10:

[0101] The main structure of this embodiment is the same as any one of Embodiments 1 to 9. Furthermore, the synchronous grouting adopts a double-liquid grouting method.

[0102] Embodiment 11:

[0103] The main structure of this embodiment is the same as any one of Embodiments 1 to 10. Further, S1, a shield shaft 3 is constructed at a designated location and shield split initial assembly sites 1 and 2 are arranged; specifically, the functions of the shield shaft and the shield split initial assembly sites 1 and 2 include:

[0104] (1) The shield shaft must be built at the construction site according to the design requirements to accommodate and support the assembly of the shield machine and the trolley;

[0105] (2) The shield shaft assembly site includes the shield shaft ground and the open cut section ground. The shield shaft ground is used for cutterhead assembly and shield lowering before the start of the split; after the start of the split, it is used as the site for subsequent trolleys to be lowered into the shaft; the open cut section ground is mainly used to store trolleys, segments, box culverts and other materials during the layout of the split start.

[0106] S2. The shield machine and its supporting trolleys are hoisted and assembled one by one into the well by means of split assembly. During the construction process, the tunnel is steadily advanced through phased excavation. It mainly includes the first phase of split excavation 4 and the second phase of split excavation 5.

[0107] In the first stage of split excavation 4, the following steps are included:

[0108] (1) The main machine + temporary trolley excavate the specified distance, and all the supporting trolleys are placed on the ground. During the trial excavation process, the excavation speed is reduced and the excavation direction of the shield is controlled. At the same time, attention is paid to adjusting the parameters of each system and excavation parameters to ensure the smooth excavation of the shield;

[0109] (2) During the excavation process, after the screw conveyor discharges slag, a temporary trolley is used to transfer the slag to the horizontal belt conveyor, which transports the slag to the ground slag distribution machine, and then distributes the slag to the slag pool;

[0110] (3) When the tunneling progress is basically normal, the segments are transported and assembled;

[0111] (4) During the excavation process, the slurry is pumped to the temporary trolley slurry storage tank through a pump pipe, and then the temporary trolley performs synchronous grouting.

[0112] In addition, in step (3), the segment transportation and assembly includes the following steps:

[0113] (a) Ground transfer: Use a forklift to transfer to the isolation pile where the lifting holes are added;

[0114] (b) Vertical lowering: Use a gantry crane to vertically lift the segment to the diesel platform underground, transporting one segment each time;

[0115] (c) Horizontal transportation in the tunnel: horizontal transportation to the assembly machine is carried out using a diesel flatbed.

[0116] In the second stage of split excavation 5, the following steps are included:

[0117] (1) The shield machine, No. 1 trolley, connecting bridge, and No. 2 trolley advance the specified distance, and No. 3 trolley, No. 4 trolley, tail wind tube platform, etc. continue to be placed on the ground. At this stage, the box culvert parts are assembled.

[0118] (2) Muck transportation: Same as the first stage of split excavation 4;

[0119] (3) When the tunneling progress is basically normal, the segments are transported and assembled;

[0120] (4) During the excavation process, the slurry is pumped to the slurry storage tank of the No. 1 trolley through a pump pipe, and then the No. 1 trolley performs synchronous grouting.

[0121] In addition, in step (3), the segment transportation and assembly includes the following steps:

[0122] (a) Ground transfer: same as the first stage;

[0123] (b) Vertical descent: Use a gantry crane to vertically lift the vehicle to the underground double-headed vehicle;

[0124] (c) Horizontal transportation in the tunnel: Use double-headed vehicles for transportation.

[0125] In addition, in step (4), the amount of synchronous grouting is strictly controlled to avoid sinking due to failure to fill the gap at the shield tail in time. It is recommended to use double-liquid slurry for synchronous grouting, which can quickly solidify and limit formation deformation.

[0126] S3. After the separate excavation reaches the specified distance, all the trolleys are hoisted down the well and connected to the main machine, and the overall excavation 6 is adopted until the remaining tunnel construction is completed.

[0127] In step S3, after step S2, except for the tail trolley platform, all have been hoisted to the underground connection, and the shield machine basically enters the normal excavation state.

[0128] In step S2, the assembly and hoisting of the shield machine adopts a split assembly method, which has unique advantages in the construction of ultra-large diameter shield machines. By disassembling the shield machine and its supporting trolley into several small pieces, conventional hoisting equipment can be used to hoist each component into the starting working shaft in turn for assembly. The present invention adopts a phased excavation construction method to ensure the safety and continuity of the construction by dividing the excavation into different stages. In the first stage of split excavation 4, the shield machine mainframe and the temporary trolley are responsible for the initial excavation, while in the second stage of split excavation 5, the excavation construction continues after the additional trolley and the connecting bridge are assembled, which further enhances the flexibility and adaptability of the excavation construction.

[0129] The invention adopts innovative transport and installation technology for the transportation and assembly of the segments, which improves the construction efficiency and reduces the error. The synchronous grouting technology is adopted. During the tunneling process of the shield machine, the synchronous grouting volume is strictly controlled to avoid sinking due to the failure to fill the gap at the tail of the shield in time, thus ensuring the stability of the tunnel structure.

[0130] Through optimized construction schemes and methods, the present invention successfully solves the construction difficulties of super-large diameter shield tunnels in confined spaces, reduces construction difficulty and risk, and reduces the impact on the surrounding environment. This construction method broadens the application scope of shield tunnels and has important practical application value and broad promotion prospects.

Claims

1. A method for the initial construction of a super-large diameter shield machine split assembly, characterized in that: The following steps are involved: S1. Build a shield shaft (3) at a designated location, and arrange a shield assembly site outside the shield shaft (3) as a temporary equipment storage site and a site for lowering the shaft; S2. Construction is carried out by adopting a phased excavation method, including the first phase of split excavation and the second phase of split excavation; The first stage of split tunneling includes the following steps: 1) Lift the components of the shield machine mainframe and temporary trolley one by one into the well and assemble them underground. After the assembly is completed, connect the temporary trolley to the shield machine mainframe; 2) The shield machine and temporary trolley carry out initial tunnel excavation, and the excavation length is h1; The second stage of split tunneling includes the following steps: 1) The temporary trolley is returned to the shaft, and the No. 1 trolley, the connecting bridge, and the No. 2 trolley assembled at the shield split assembly site are hoisted down the shaft in sequence; After the No. 1 and No. 2 trolleys are lowered into the well, they move into the tunnel gate and connect with the connecting bridge at the tunnel gate. Then, they move as a whole to h1 and connect with the main engine. 2) The shield machine, trolley No. 1, connecting bridge and trolley No. 2 carry out secondary excavation of the tunnel, and the excavation length is h2; S3. After the split excavation reaches h1+h2, the No. 3 trolley, No. 4 trolley and the tail wind tube platform assembled at the shield split assembly site will be hoisted down the well in sequence and then connected to the shield machine host respectively; S4. After the connection is completed, the whole machine excavation method is adopted for construction. The main shield machine and trolleys 1, 2, 3 and 4 excavate the tunnel with an excavation length of h3 until the tunnel construction is completed.

2. The method for starting construction of a super-large diameter shield split assembly according to claim 1 is characterized in that: The shield split initial assembly site includes the shield shaft ground (1) and the open cut section ground (2); The shield shaft surface (1) is used as the site for assembling the cutter head and lowering the shield body into the shaft before the start of the separation. After the start of the separation, it serves as the site for the subsequent trolley to be lowered into the shaft; The surface of the open cut section (2) is used as a storage place for trolleys, pipe segments and box culverts during the initial stage of the split.

3. The method for starting construction of a super-large diameter shield split assembly according to claim 1 is characterized by: The components of the shield machine mainframe include a reaction frame bottom block, a front middle shield lower block, a main drive, a M-beam, a front middle shield upper block, a cutter head, a tail shield bottom block, an assembler, a screw machine, and left and right tail shield top blocks, which are sequentially lowered into the well.

4. The method for starting construction of a super-large diameter shield split assembly according to claim 1 is characterized in that: The range of h1 is 0 to 65 m, the range of h2 is 65 to 125 m, the range of h3 is 125 m to h, and h1+h2+h3=h, where h is the total length of the tunnel.

5. The method for starting construction of a super-large diameter shield split assembly according to claim 1 is characterized in that: The first stage of split tunneling includes the following steps: 1.1) The shield machine and temporary trolley start excavation; 1.2) During the excavation process, after the screw conveyor discharges the slag in the excavation chamber of the shield machine, the discharged slag is transferred to the horizontal belt conveyor through a temporary trolley. The horizontal belt conveyor transports the slag to the ground slag transfer and distribution machine, and finally the ground slag transfer and distribution machine transports the slag to the slag pit; 1.3) When the tunneling reaches normal state, transport and assemble the segments; 1.4) During the excavation process, the slurry is pumped to the slurry storage tank of the temporary trolley through the pump pipe, and then the temporary trolley performs synchronous grouting.

6. The method for starting construction of a super-large diameter shield split assembly according to claim 5 is characterized in that: Transport and assembly of segments in step 1.3) The following steps are involved: 1.3.1) Use a forklift to transport the pipe segments to the newly added lifting holes of the isolation piles; 1.3.2) Use a gantry crane to vertically lower the pipe segments into the well and lift them vertically onto the diesel platform in the well; 1.3.3) Use diesel flatbed to transport the pipe segments horizontally in the tunnel to the assembly machine.

7. The method for starting construction of a super-large diameter shield split assembly according to claim 1 is characterized in that: The second stage of split tunneling includes the following steps: 2.1) When the shield machine and temporary trolley have advanced to h1, the shield machine, trolley No. 1, connecting bridge and trolley No. 2 will continue to advance, and the box culvert parts will be assembled at the shield split assembly site; 2.2) During the excavation process, after the screw conveyor discharges the slag in the excavation chamber of the shield machine, the discharged slag is transferred to the horizontal belt conveyor through the No. 1 and No. 2 trolleys. The horizontal belt conveyor transports the slag to the ground slag transfer and distribution machine, and finally the ground slag transfer and distribution machine transports the slag to the slag pit; 2.3) When normal excavation is achieved, transport and assemble the segments; 2.4) During the excavation process, the slurry is pumped to the slurry storage tank of trolley No. 1 through the pump pipe, and trolley No. 1 performs synchronous grouting.

8. The method for starting construction of super-large diameter shield split assembly according to claim 7 is characterized in that: The transportation and assembly of the segments in step 2.3) includes the following steps: 2.3.1) Use a forklift to transport the pipe segments to the newly added lifting holes of the isolation piles; 2.3.2) Use a gantry crane to vertically lower the pipe segments into the well and transport them vertically to the double-headed car in the well; 2.3.3) Use double-headed vehicles to transport the pipe segments horizontally in the tunnel to the assembly machine.

9. A method for starting construction of split assembly of super-large diameter shield according to claim 5 or 7, characterized in that: During the synchronous grouting process, the dual index control standard of grouting pressure and grouting volume is adopted, that is, when the grouting pressure reaches the set value and the grouting volume reaches more than 90% of the design value, the quality requirements are met.

10. The method for starting construction of a super-large diameter shield split assembly according to claim 5 or 7, characterized in that: The synchronous grouting adopts the double-liquid grouting method.

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