A method for starting construction of a large-diameter shield split assembly

Abstract

The application discloses a kind of super-large diameter shield split assembly originating construction method, comprising the following steps: S1, shield well is built in specified position, and shield split assembly originating site is arranged outside shield well;S2, construction is carried out using the way of excavation in stages, including split excavation first stage and split excavation second stage.In the first stage, initial excavation is carried out to tunnel by shield machine main machine and temporary trolley, and the length of excavation is h1;In the second stage, secondary excavation is carried out to tunnel by shield machine main machine, No.1 trolley, connecting bridge and No.2 trolley, and the length of excavation is h2;S3, when split excavation reaches h1+h2, construction is carried out using the way of whole machine excavation, and excavation is carried out to tunnel by shield machine main machine and No.1, No.2, No.3 and No.4 trolleys, and the length of excavation is h3, until tunnel construction is completed.The application is suitable for large-diameter shield tunnel engineering, effectively solves the originating problem of super-large diameter shield machine under the condition that construction space is limited, and is beneficial to improving construction efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tunnel engineering construction, and particularly relates to a super-large-diameter shield split assembly starting construction method. BACKGROUND

[0002] Super-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 super-large-diameter tunnels is increasing. However, the challenges faced during construction are also increasing, especially in the case of limited construction space. Existing shield starting construction methods mainly include whole machine assembly and whole body tunneling, which are suitable for conventional construction conditions but have deficiencies in dealing with limited construction space, such as high difficulty, high risk, and large impact on the surrounding environment. The traditional whole machine assembly method cannot solve the transportation and assembly problems of super-large-diameter shield machines, and in the case of limited construction space, it is easy to cause problems such as shield machine propulsion obstruction and low tunneling efficiency. SUMMARY

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

[0004] S1, constructing a shield well at a designated location and arranging a shield split starting assembly site outside the shield well as a temporary equipment storage site and a well entry site;

[0005] S2, adopting a phased tunneling method for construction, including a split tunneling first phase and a split tunneling second phase;

[0006] The split tunneling first phase comprises the following steps:

[0007] 1) Hoisting each component of the shield machine main machine and the temporary trolley into the well one by one and assembling them underground, and after the assembly is completed, connecting the temporary trolley with the shield machine main machine;

[0008] 2) Tunneling initially by the shield machine main machine and the temporary trolley, with a tunneling length of h1;

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

[0010] 1) Retreating the temporary trolley into the well, and hoisting the No. 1 trolley, the connecting bridge, and the No. 2 trolley assembled in the shield split starting assembly site into the well in sequence;

[0011] After the No. 1 trolley and the No. 2 trolley are hoisted into the well, they are moved to the portal, connected with the connecting bridge at the portal, and then moved to the main machine at h1;

[0012] 2) by the shield host, No. 1 trolley, connecting bridge and No. 2 trolley to tunnel for the second time to dig, the length of the excavation is h2;

[0013] S3, when the split body excavation to h1+h2, will be assembled in the shield split body starting site 3, No. 4 trolley and tail section wind cylinder platform in turn hoisted down the well, and then connected with the shield host;

[0014] S4, after the connection is completed, the whole machine is used for excavation, and the tunnel is excavated by the shield host and No. 1, No. 2, No. 3 and No. 4 trolley, the length of the excavation is h3, until the completion of the tunnel construction.

[0015] Further, the shield split body starting site includes shield well ground and open cut section ground;

[0016] The shield well ground is the cutter head assembly and shield body downhole site before split body starting; after split body starting, it is used as the downhole site of subsequent trolley.

[0017] The open cut section ground is used as the storage site of trolley, segment and box culvert during split body starting.

[0018] Further, the components of the shield host include anti-force frame bottom block, front middle shield lower part block, main drive, m-shaped beam, front middle shield upper part block, cutter head, tail shield bottom block, assembling machine, screw machine and tail shield left and right top block which are sequentially downhole.

[0019] Further, h1 is in the range of 0-65m, h2 is in the range of 65-125m, h3 is in the range of 125m-h, and h1+h2+h3=h, h is the total length of the tunnel.

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

[0021] 1.1) excavated by the shield host and temporary trolley;

[0022] 1.2) during the excavation process, the screw machine discharges the muck in the shield excavation bin, and then the discharged muck is transferred to the horizontal belt conveyor, the horizontal belt conveyor transports the muck to the ground muck transfer and distribution machine, and finally the muck is transported to the muck pool by the ground muck transfer and distribution machine;

[0023] 1.3) when the normal excavation is reached, 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 synchronous grouting is carried out by the temporary trolley.

[0025] Further, the transport and assembly of segments in step 1.3) include the following steps:

[0026] 1.3.1) using a forklift to carry out ground operation, and transferring the pipe segment to the newly added hoisting hole of the isolation pile;

[0027] 1.3.2) using a gantry crane to vertically lower into the well, and vertically hoisting the pipe segment to the diesel flat plate in the well;

[0028] 1.3.3) transporting the pipe segment in the hole by the diesel flat plate to the assembling machine.

[0029] Further, the second stage of the split tunneling comprises the following steps:

[0030] 2.1) after the shield machine and the temporary trolley are tunneled to h1, continue to tunnel through the shield machine, the No. 1 trolley, the connecting bridge and the No. 2 trolley, and assemble the box culvert piece at the shield split starting assembly site;

[0031] 2.2) during the tunneling process, after the spiral machine discharges the muck in the shield machine excavation bin, the discharged muck is transferred to the horizontal belt conveyor through the No. 1 trolley and the No. 2 trolley, the horizontal belt conveyor transports the muck to the ground muck transfer and distribution machine, and finally the ground muck transfer and distribution machine transports the muck to the muck pool;

[0032] 2.3) when the normal tunneling is reached, the pipe segment is transported and assembled;

[0033] 2.4) during the tunneling process, the slurry is pumped to the slurry storage tank of the No. 1 trolley through the pump pipe, and the synchronous grouting is carried out by the No. 1 trolley.

[0034] Further, the transportation and assembly of the pipe segment in step 2.3) comprises the following steps:

[0035] 2.3.1) using a forklift to carry out ground operation, and transferring the pipe segment to the newly added hoisting hole of the isolation pile;

[0036] 2.3.2) using a gantry crane to vertically lower into the well, and vertically hoisting the pipe segment to the double-end car in the well;

[0037] 2.3.3) transporting the pipe segment in the hole by the double-end car to the assembling machine.

[0038] Further, during the synchronous grouting, a double-index control standard of grouting pressure and grouting amount is adopted, that is, when the grouting pressure reaches the set value and the grouting amount reaches more than 90% of the design value, the quality requirement is reached.

[0039] Further, the synchronous grouting adopts a double-liquid slurry grouting method.

[0040] The technical effect of the present application is self-evident, and the beneficial effects of the present application are as follows:

[0041] Firstly, the construction equipment can enter the construction site flexibly by the split assembly technology, and the operability of the construction is greatly improved. Secondly, the construction scheme of split excavation is adopted, and the shield construction is divided into multiple stages, so that the starting problem of the super large diameter shield machine under the condition of limited construction space is effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is a schematic diagram of the split assembly starting space of the super large diameter shield of the application (the dashed line in the working well is a size diagram of equipment hoisting and material transportation).

[0043] Figure 2 It is a flowchart of the application.

[0044] In the figure: 1-ground of shield well, 2-ground of open excavation section, 3-shield well, 4-first stage split excavation, 5-second stage split excavation, 6-entire machine excavation. DETAILED DESCRIPTION

[0045] The application will be further described below in conjunction with examples, but should not be understood as limiting the above-mentioned subject matter of the application to the following examples. According to ordinary technical knowledge and conventional means in the art, various substitutions and modifications can be made without departing from the above-mentioned technical idea of the application, and all should be included in the protection scope of the application.

[0046] Example 1:

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

[0048] S1, building a shield well 3 at a designated position, and arranging a shield split starting assembly site outside the shield well 3 as a temporary storage site of equipment and a well lowering site;

[0049] S2, adopting a split excavation mode for construction, including split excavation first stage and split excavation second stage;

[0050] The split excavation first stage comprises the following steps:

[0051] 1) Hoisting each component of the shield machine main machine and the temporary trolley into the well one by one, and assembling them underground, and after the assembly is completed, connecting the temporary trolley and the shield machine main machine;

[0052] 2) The tunnel is initially excavated by the shield machine main machine and the temporary trolley, and the excavation length is h1;

[0053] The split excavation second stage comprises the following steps:

[0054] 1) The temporary trolley is returned to the shaft, and the No. 1 trolley, connecting bridge and No. 2 trolley, which are assembled at the shield tunneling unit launching and assembly site, are hoisted into the shaft in sequence.

[0055] After the No. 1 and No. 2 trolleys are lowered into the well, they are moved to the tunnel entrance and connected to the connecting bridge at the tunnel entrance. Then they are moved as a whole to h1 and connected to the main unit.

[0056] 2) The tunnel is excavated twice by the main shield machine, No. 1 trolley, connecting bridge and No. 2 trolley, with an excavation length of h2;

[0057] S3. When the segmented tunneling reaches h1+h2, the No. 3 trolley, No. 4 trolley and the tail ventilation duct platform, which are assembled at the shield segment starting assembly site, will be hoisted into the shaft in sequence and then connected to the shield machine host respectively.

[0058] S4. After the connection is completed, the tunneling is carried out by the whole machine tunneling method. The tunnel boring machine and No. 1, 2, 3 and 4 trolleys are used to tunnel the tunnel for a length of h3 until the tunnel construction is completed.

[0059] Example 2:

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

[0061] Before the split launch, the ground surface 1 of the shield shaft serves as the site for assembling the cutterhead and lowering the shield body; after the split launch, it serves as the site for lowering the subsequent trolley.

[0062] The cut-and-cover section 2 serves as a storage area for the trolley, segments, and box culverts during the initial split-excavation phase.

[0063] Example 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 host include the reaction frame bottom block, the lower part of the front and middle shield, the main drive, the cross beam, the upper part of the front and middle shield, the cutterhead, the tail shield bottom block, the assembly machine, the screw conveyor, and the left and right top blocks of the tail shield, which are lowered into the shaft in sequence.

[0065] The assembly process of the tunnel boring machine (TBM) main unit is as follows: cutterhead welding → lowering of reaction frame bottom block into the shaft → lowering of front and middle shield lower section into the shaft → lowering of main drive and cross beam into the shaft → lowering of front and middle shield upper section into the shaft → lowering of cutterhead into the shaft → welding between shield sections → moving the main unit forward → lowering of tail shield bottom block into the shaft → lowering of assembly machine into the shaft → lowering and installation of spiral conveyor into the shaft → lowering of tail shield left and right top blocks into the shaft → welding of tail shield brushes → installation of reaction frame → whole machine commissioning and acceptance.

[0066] Example 4:

[0067] The main structure of this embodiment is the same as any one of embodiments 1-3, further, 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, h is the total length of the tunnel.

[0068] The specific length of the split tunneling needs to be determined according to specific projects.

[0069] Embodiment 5:

[0070] The main structure of this embodiment is the same as any one of embodiments 1-4, further, the first stage of split tunneling includes the following steps:

[0071] 1.1) Tunneling by the shield machine main machine and the temporary trolley;

[0072] 1.2) During the tunneling process, the screw machine discharges the muck in the shield machine excavation bin, and then transfers the discharged muck to the horizontal belt conveyor through the temporary trolley, the horizontal belt conveyor transports the muck to the ground muck transfer and distribution machine, and finally the ground muck transfer and distribution machine transports the muck to the muck pool;

[0073] 1.3) When normal tunneling is reached, transport and assemble segments;

[0074] 1.4) During the tunneling 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 embodiment 5, further, the transport and assembly of segments in step 1.3) includes the following steps:

[0077] 1.3.1) Ground transportation is carried out using a forklift to transfer the segments to the newly added hoisting hole of the isolation pile;

[0078] 1.3.2) Vertical lowering into the well is carried out using a gantry crane to vertically hoist the segments to the diesel flat plate in the well;

[0079] 1.3.3) In-hole horizontal transportation is carried out by the diesel flat plate to transport the segments to the assembly machine.

[0080] Embodiment 7:

[0081] The main structure of this embodiment is the same as any one of embodiments 1-6, further, the second stage of split tunneling includes the following steps:

[0082] 2.1) When the shield machine main machine and the temporary trolley tunnel to h1, continue tunneling by the shield machine main machine, the No. 1 trolley, the connecting bridge and the No. 2 trolley, and assemble box culvert components at the shield split starting assembly site;

[0083] 2.2) In the process of tunneling, the screw machine discharges the muck in the shield machine excavation bin, and then the discharged muck is transferred to the horizontal belt conveyor through the No. 1 trolley and the No. 2 trolley, the horizontal belt conveyor transports the muck to the ground muck transfer and distribution machine, and finally the ground muck transfer and distribution machine transports the muck to the muck pool;

[0084] 2.3) When normal tunneling is reached, the pipe segments are transported and assembled.

[0085] 2.4) In the process of tunneling, the slurry is pumped to the slurry storage tank of the No. 1 trolley through the pump pipe, and the synchronous grouting is performed by the No. 1 trolley.

[0086] Example 8:

[0087] The main structure of this embodiment is the same as that of Example 7, and further, the transportation and assembly of pipe segments in step 2.3) include the following steps:

[0088] 2.3.1) Ground transportation is performed using a forklift to transfer the pipe segments to the newly added hoisting hole of the isolation pile;

[0089] 2.3.2) Vertical lowering into the well is performed using a gantry crane to vertically hoist the pipe segments to the double-end car underground;

[0090] 2.3.3) In-hole horizontal transportation is performed by the double-end car to transport the pipe segments to the assembly machine.

[0091] Example 9:

[0092] The main structure of this embodiment is the same as that of any one of Examples 4-8, and further, in the process of synchronous grouting, a double-index control standard of grouting pressure and grouting amount is adopted, that is, when the grouting pressure reaches the set value and the grouting amount reaches more than 90% of the design value, the quality requirement is met.

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

[0094] The formula for the design value of the grouting amount is:

[0095]

[0096] In the formula, D is the cutting diameter of the shield machine, which is φ14500 mm in this embodiment.

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

[0098] L is the width of the pipe segment, which is 2000 mm in this embodiment.

[0099] λ is the grouting rate (generally taken as 1.1-1.2).

[0100] Embodiment 10:

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

[0102] Embodiment 11:

[0103] The main structure of this embodiment is the same as any one of Embodiments 1-10, and further, S1, a shield shaft 3 is built at a designated position and shield sub-assembly sites 1 and 2 are arranged; specifically, the functions of the shield shaft and the shield sub-assembly sites 1 and 2 include:

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

[0105] (2) The shield sub-assembly site includes the shield shaft ground and the open-cut section ground. Among them, the shield shaft ground is the cutter head assembly site and the shield body downhole site before the sub-assembly; after the sub-assembly, it is used as the subsequent trolley downhole site; the open-cut section ground is mainly used for storing trolleys, segments, box culverts and other materials during the arrangement of the sub-assembly.

[0106] S2, the shield machine main machine and each supporting trolley are hoisted downhole and assembled one by one in a sub-assembly manner. During the construction process, through phased tunneling, the steady advancement of the tunnel is realized. It mainly includes the first stage sub-tunneling 4 and the second stage sub-tunneling 5.

[0107] In the first stage sub-tunneling 4, it includes the following steps:

[0108] (1) The main machine + temporary trolley tunnels a specified distance, and all the subsequent supporting trolleys are placed on the ground. During the trial tunneling process, the tunneling speed is reduced to control the tunneling direction of the shield, and at the same time, the parameters of each system and the tunneling parameters are adjusted in time to ensure the smooth tunneling of the shield;

[0109] (2) During the tunneling process, after the spiral machine discharges the slag, the temporary trolley is used to transfer the slag chute, and the slag is transferred to the horizontal belt conveyor. The horizontal belt conveyor transports the slag to the ground slag transfer distributor, and then distributes it to the slag pool;

[0110] (3) When the normal tunneling is basically reached, the segment transportation and assembly are carried out;

[0111] (4) During the tunneling process, the pump pipe is used to pump to the temporary trolley slurry storage tank, and then the temporary trolley is used for synchronous grouting.

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

[0113] (a) Ground transfer: using a forklift, transfer to the newly added hoisting hole at the isolation pile;

[0114] (b) Vertical down the well: using gantry crane, vertical hoisting to the well diesel flat, each transport 1 piece of pipe;

[0115] (c) Hole horizontal transport: using diesel flat horizontal transport to the assembly machine.

[0116] In the second stage of body excavation 5, it includes the following steps:

[0117] (1) Shield main machine, No. 1 trolley, connecting bridge, No. 2 trolley excavate a specified distance, No. 3 trolley, No. 4 trolley, tail air duct platform, etc. Continue to be placed on the ground. This stage begins to assemble box culvert parts.

[0118] (2) Slag transport: same as the first stage of body excavation 4;

[0119] (3) When basically reaching normal excavation, pipe transport and assembly;

[0120] (4) In the process of excavation, pump to No. 1 trolley slurry tank by pump pipe, and then by No. 1 trolley for synchronous grouting.

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

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

[0123] (b) Vertical down the well: using gantry crane, vertical hoisting to the well double-end car;

[0124] (c) Hole horizontal transport: using double-end car transport.

[0125] In addition, in step (4), strictly control the amount of synchronous grouting to avoid sinking due to the failure of timely filling of the shield tail gap, and recommend using double-liquid slurry for synchronous grouting, which can quickly set and limit stratum deformation.

[0126] S3, after body excavation to a specified distance, all trolleys are hoisted down the well and connected with the main machine, using whole excavation 6 until the remaining tunnel construction is completed.

[0127] In step S3, after step S2, at this time, except for the tail trolley platform, all have been hoisted down the well and connected, 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 a unique advantage especially in super-large diameter shield construction. By disassembling the shield machine and its supporting trolley into several small pieces, each component can be hoisted into the starting shaft for assembly in sequence using conventional hoisting equipment. The application adopts a phased tunneling construction method, which divides different tunneling stages to ensure the safety and continuity of construction. In the first stage of split tunneling 4, the shield machine main machine and the temporary trolley are responsible for initial tunneling, and in the second stage of split tunneling 5, after the additional trolley and connecting bridge are assembled, the tunneling construction is continued, further enhancing the flexibility and adaptability of the tunneling construction.

[0129] The application adopts innovative transfer and installation technology for the transportation and assembly of segments, improving construction efficiency and reducing errors. The synchronous grouting technology is adopted, and the synchronous grouting amount is strictly controlled during the tunneling process of the shield machine, to avoid sinking due to the failure to timely fill the shield tail gap, and to ensure the stability of the tunnel structure.

[0130] Through the optimized construction scheme and method, the application successfully solves the construction problem of super-large diameter shield in restricted space, reduces the construction difficulty and risk, and reduces the influence on the surrounding environment. The construction method widens the application range of shield tunnel, and has important practical application value and wide popularization prospect.

Claims

1. A method for the initial construction of a large-diameter shield tunneling machine by split assembly, characterized by comprising the following steps: S1. Construct a shield shaft (3) at a designated location, and arrange a shield split assembly site outside the shield shaft (3) as a temporary storage site for equipment and a site for going down into the shaft. S2. The construction will be carried out in stages, including the first stage of separate tunneling and the second stage of separate tunneling. The first stage of the split-section tunneling includes the following steps: 1.1) The components of the tunnel boring machine (TBM) main unit and the temporary trolley are hoisted into the shaft one by one and assembled underground. After assembly, the temporary trolley is connected to the TBM main unit. 1.2) The tunnel is initially excavated using the tunnel boring machine (TBM) and temporary trolleys, with an excavation length of [length to be filled in]. ; The range is 0–65m; 1.2.1) Excavation begins with the tunnel boring machine (TBM) and a temporary trolley; 1.2.2) During the tunneling process, after the auger discharges the excavation chamber of the tunnel boring machine, the discharged excavation is transferred to the horizontal belt conveyor by a temporary trolley. The horizontal belt conveyor transports the excavation to the ground muck transfer and placing machine, and finally the ground muck transfer and placing machine transports the excavation to the muck pit. 1.2.3) When normal tunneling is achieved, transport and assemble the tunnel segments; 1.2.4) During the tunneling 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; The second phase of the split-section tunneling includes the following steps: 2.1) The temporary trolley is returned to the shaft, and the No. 1 trolley, connecting bridge and No. 2 trolley, which are assembled at the shield tunneling unit launching and assembly site, are hoisted into the shaft in sequence. After trolleys 1 and 2 are lowered into the shaft, they are moved into the tunnel entrance and connected to the connecting bridge at the entrance. Then, the entire assembly is moved to... It is connected to the host computer; 2.2) The tunnel is excavated a second time using the tunnel boring machine (TBM), No. 1 trolley, connecting bridge, and No. 2 trolley, with an excavation length of [length missing]. ; The range is 65–125m; 2.2.1) When the tunnel boring machine and temporary trolley have advanced to... Afterwards, the tunnel boring machine (TBM) continued to excavate using the main machine, No. 1 trolley, connecting bridge, and No. 2 trolley, and assembled the box culvert components at the TBM split assembly site. 2.2.2) During the tunneling process, after the screw conveyor discharges the excavated soil from the tunnel boring machine's excavation chamber, the discharged soil is transferred to the horizontal belt conveyor by No. 1 trolley and No. 2 trolley. The horizontal belt conveyor transports the soil to the ground muck transfer and placing machine, and finally the ground muck transfer and placing machine transports the soil to the muck pit. 2.2.3) When normal tunneling is achieved, transport and assemble the tunnel segments; 2.2.4) During the tunneling process, the slurry is pumped to the slurry storage tank of No. 1 trolley through the pump pipe, and the No. 1 trolley performs synchronous grouting; S3, when the split excavation reaches... Afterwards, the No. 3 trolley, No. 4 trolley, and tail ventilation duct platform, which have been assembled at the shield machine's initial assembly site, will be hoisted into the shaft in sequence and then connected to the main shield machine. S4. After connection, construction will proceed using a whole-machine tunneling method. The tunnel boring machine (TBM) and trolleys 1, 2, 3, and 4 will excavate the tunnel, with a tunneling length of [length to be filled in]. Until the tunnel construction is completed; The range is 125m~, and , which is the total length of the tunnel.

2. The method for initial construction of a large-diameter shield tunneling machine by split assembly according to claim 1, characterized in that: The shield tunneling unit assembly site includes the shield shaft surface (1) and the open-cut section surface (2). The ground surface (1) of the shield shaft is the site for the assembly of the cutterhead and the lowering of the shield body before the split launch; After the split launch, it serves as the site for the subsequent trolleys to be lowered into the well. The ground surface of the cut-and-cover section (2) serves as a storage area for the trolley, segments and box culverts during the initial split-cutting phase.

3. The method for initial construction of a large-diameter shield tunneling machine by split assembly according to claim 1, characterized in that: The components of the main shield machine include, in sequence, the reaction frame bottom block, the lower part of the front and middle shield, the main drive, the cross beam, the upper part of the front and middle shield, the cutterhead, the tail shield bottom block, the assembly machine, the auger, and the left and right top blocks of the tail shield.

4. The method for initial construction of a large-diameter shield tunneling machine by split assembly according to claim 1, characterized in that, The transportation and assembly of tunnel segments in step 1.2.3) Includes the following steps: 1.2.3.1) Use forklifts for ground transport to move the tunnel segments to the newly added hoisting holes of the isolation piles; 1.2.3.2) A gantry crane is used for vertical lowering of the tunnel segments into the well, which are then vertically lifted onto the diesel-powered flatbed at the bottom of the well. 1.2.3.3) The tunnel segments are transported horizontally inside the tunnel using a diesel flatbed to the assembly machine.

5. The method for initial construction of ultra-large diameter shield tunneling machine segment assembly according to claim 1, characterized in that the transportation and assembly of tunnel segments in step 2.2.3) includes the following steps: 2.2.3.1) Use forklifts for ground transport to move the tunnel segments to the newly added hoisting holes of the isolation piles; 2.2.3.2) A gantry crane is used for vertical lowering of the tunnel segments into the shaft, which are then vertically lifted onto a double-headed trolley in the shaft. 2.2.3.3) The tunnel segments are transported horizontally inside the tunnel by a double-headed vehicle to the assembly machine.

6. The method for initial construction of a large-diameter shield tunneling machine by split assembly according to claim 1, characterized in that: During the synchronous grouting process, a dual-indicator control standard of grouting pressure and grouting volume is adopted. 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.

7. The method for initial construction of a large-diameter shield tunneling machine by split assembly according to claim 1, characterized in that: Simultaneous grouting adopts the two-liquid grouting method.

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