A fully mechanized construction assembled subway station and construction method

Abstract

The application discloses a full-mechanized construction assembled subway station, which comprises a left-line tunnel, a right-line tunnel, an assembled water collecting pit, an underground passage, an assembled elevator shaft and a ground station hall, the left-line tunnel and the right-line tunnel are arranged side by side, the assembled water collecting pit is arranged in the left-line tunnel and the right-line tunnel and is used for collecting wastewater generated by the station, the underground passage is connected with the left-line tunnel and the right-line tunnel, and the assembled elevator shaft is connected with the underground passage and the ground station hall. The application has the advantages and effects that the structure of the subway station is constructed by using a mechanical method, the construction efficiency is improved, the degree of mechanization is high, the construction safety risk is reduced, the construction quality is improved, the labor operation intensity of workers is reduced, and the influence on the surrounding environment is small.

Description

Technical Field

[0001] This invention relates to the field of building construction, and in particular to a fully mechanized prefabricated subway station and its construction method. Background Technology

[0002] In recent years, my country's urban infrastructure construction has developed rapidly, and the number of urban underground space development projects has continued to increase. As an emerging public transportation tool, the subway has a large transportation capacity and high speed, which can effectively alleviate the pressure on surface traffic and has been included in the construction plans of more and more cities.

[0003] Subway stations are places for passengers to board, alight, transfer, and wait for trains, and are important structures in the underground subway network. Currently, most subway stations are constructed using the open-cut method. However, this method involves large excavation areas, significant environmental impact, and can easily cause traffic congestion. The tunneling method, on the other hand, carries relatively higher risks, especially in water-rich strata with high water pressure and high water levels.

[0004] Due to its advantages such as safety and efficiency, mechanical methods have gradually replaced traditional open-cut and tunneling methods. However, existing mechanical methods cannot achieve fully mechanized construction of subway stations, and some structures still require open-cut or tunneling construction, which needs to be improved. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a fully mechanized prefabricated subway station, which has the advantages of improved construction efficiency, high degree of mechanization, reduced construction safety risks, improved construction quality, reduced labor intensity for workers, and minimal impact on the surrounding environment.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a fully mechanized prefabricated subway station, comprising a left tunnel, a right tunnel, a prefabricated sump pit, an underground passage, a prefabricated elevator shaft, and a ground-level station hall. The left tunnel and the right tunnel are arranged side by side and have circular, horseshoe-shaped, or rectangular cross-sections. The prefabricated sump pit is located in the left tunnel and the right tunnel and is used to collect wastewater generated by the station. The underground passage connects the left tunnel and the right tunnel, and the prefabricated elevator shaft connects the underground passage and the ground-level station hall.

[0007] In a preferred embodiment, the present invention can be further configured as follows: a spiral escalator and a vertical lift are provided in the prefabricated elevator shaft, the vertical lift is located in the middle of the prefabricated elevator shaft, the spiral escalator surrounds the vertical lift and is arranged in a spiral shape, one side of the spiral escalator is connected to the prefabricated elevator shaft and the other side is connected to the outer structure of the vertical lift, the spiral escalator includes an ascending escalator and a descending escalator, and the upper and lower ends of the ascending escalator and the descending escalator are connected to the escalator platform.

[0008] In a preferred embodiment, the present invention may be further configured such that: the ground station hall is provided with a turnstile, the turnstile being located outside the prefabricated elevator shaft.

[0009] In a preferred embodiment, the present invention can be further configured as follows: the prefabricated sump includes a steel pipe section located below the left tunnel and the right tunnel, a prefabricated pump house is provided inside the steel pipe section, the prefabricated pump house is divided into an upper maintenance chamber and a lower sump, and backfill concrete is provided between the prefabricated pump house and the steel pipe section.

[0010] To address the shortcomings of existing technologies, the purpose of this invention is to provide a fully mechanized construction method for prefabricated subway stations, which has the advantages of improved construction efficiency, high degree of mechanization, reduced construction safety risks, improved construction quality, reduced labor intensity for workers, and minimal impact on the surrounding environment.

[0011] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a method for constructing a fully mechanized prefabricated subway station, comprising the following steps: S1, the location of the fully mechanized station and the location of the tunnel section are selected according to the plan; S2, at the far end of the fully mechanized station, in the open-cut station or open-cut shaft, the tunnel boring machine is lowered into the shaft for assembly and to begin excavation. The cutterhead cuts the soil, removes slag, assembles the tunnel segments, and simultaneously grouts. Upon reaching the receiving shaft, it is received, disassembled, and hoisted out, thus achieving tunnel breakthrough and completing the breakthrough construction of the left and right tunnels of the fully mechanized station. During construction, special tunnel segments are assembled according to the selected underground passage and prefabricated sump locations at the station location. These special tunnel segments are reinforced concrete glass fiber reinforced tunnel segments, with the glass fiber reinforced parts being the locations of the underground passage and prefabricated sump openings. S3, based on the location of the fully mechanized station, the location of the prefabricated elevator shaft is selected between the left and right tunnels. The prefabricated elevator shaft is located at the center of the underground passage of the left and right lines and is arranged symmetrically. S4, assemble the reverse pull method pipe jacking machine in the left and right tunnels, and construct the underground passage between the left and right tunnels and the prefabricated elevator shaft; S5, assemble the reverse-pull pipe jacking machine in the first underground passage to construct the third underground passage, and complete the connection of the entire underground passage by referring to the construction steps of the first and second underground passages; construct the portal ring beam at the junction of the three underground passages with the left tunnel, the right tunnel and the prefabricated elevator shaft; S6. Assemble vertical micro-shields in the formed left and right tunnels and construct water collection pits; after the water collection pits are completed, construct the platform slabs for the left and right tunnels. S7, construct a ground-level station hall at the location of the prefabricated elevator shaft, and install spiral escalators and vertical elevators inside the prefabricated elevator shaft; S8, the ground station hall is equipped with various functional rooms required for the subway station, such as turnstiles and the central control room, and the construction of the subway station is finally completed.

[0012] In a preferred embodiment, the present invention can be further configured as follows: In step S3, the prefabricated elevator shaft is constructed using a shaft boring machine. A starting shaft structure is constructed around the prefabricated elevator shaft. The shaft structure consists of a first concrete pipe section with a cutting edge and at least one ordinary concrete pipe section. First, a reinforced concrete interlocking ring beam is constructed around the prefabricated elevator shaft. Soil is excavated within the interlocking ring beam. The first concrete pipe section with the cutting edge and at least one ordinary concrete pipe section are installed into the interlocking ring beam. Each pipe section forms a complete ring. The pipe sections are connected by bolts, and waterproofing measures are implemented between the pipe sections. The shaft boring machine and its supporting equipment are installed. The three mechanical arms of the shaft boring machine are firmly pressed against the shaft wall of the starting shaft structure. A rotatable milling head is installed on the telescopic arm below the mechanical arms. Cutting teeth are installed on the milling head to excavate the soil at the bottom of the shaft, completing the entire process. The excavation of the vertical shaft cross-section involves pumping the excavated soil to the surface for mud-water separation using a mud pump. The shaft tunneling machine is connected to the locking ring beam via four hydraulic cylinders and to the first reinforced concrete pipe section with cutting edges via steel wire ropes. During excavation, the entire vertical shaft structure is held in place and lowered. For each pipe section the shaft tunneling machine excavates, a new pipe section is installed above the topmost pipe section exposed above ground. Then, a settling module is used to lower all pipe sections, completing one cycle of construction until the depth requirements of the prefabricated elevator shaft are met. Underwater, bottom sealing concrete is poured. After the strength meets the requirements, excess mud and water above the bottom sealing concrete are pumped out, and a concrete guide platform is constructed as a guide base for the later reverse-pull method pipe jacking machine to pass through the elevator shaft. The pipe section connecting to the underground passage uses special reinforced concrete pipe sections, and the opening position uses glass fiber reinforcement to facilitate cutting by the tunneling machine's cutterhead.

[0013] In a preferred embodiment, the present invention can be further configured as follows: In step S4, the reverse-pull method pipe jacking machine is transported to the junction of the left-line tunnel and the underground passage, the reverse-pull method pipe jacking machine is installed, and the initial excavation is completed using the sleeve method. The pipe jacking machine cutterhead cuts special pipe segments into the soil, and the slag is discharged and the pipe sections are assembled. The slag and soil of the underground passage are backfilled in the prefabricated elevator shaft. The backfilling height is calculated based on the water and soil pressure at the underground passage to ensure that no water or sand surge occurs when the pipe jacking machine enters the prefabricated elevator shaft, thus ensuring the safety of the first pipe jacking machine reception construction. The pipe jacking machine cuts and grinds through the special pipe segments of the prefabricated elevator shaft (5) for the first time, and excavates to the concrete guide platform to complete the first reception construction. It then excavates along the direction of the guide platform to the junction of the underground passage and the prefabricated elevator shaft on the other side of the prefabricated elevator shaft. After the pipe jacking machine cuts the special pipe segment to complete the second launch, it continues to excavate the right tunnel. A receiving trolley is installed in advance in the right tunnel, and a receiving sleeve is installed inside the receiving trolley. The pipe jacking machine cuts the special pipe segment of the right tunnel and enters the receiving sleeve to complete the pipe jacking machine reception. The receiving trolley is then moved to the ground, and the facilities and equipment at the launching end are moved to the ground for inspection. After the inspection is completed, the reverse-pull method pipe jacking machine is lowered back into the well for reassembly, and the construction of the second underground passage begins. The above steps are repeated until the construction of the second underground passage is completed. After the underground passage is completed, grouting is performed at the junction to stop water. After the grouting reinforcement meets the requirements, the mud and water and pipe segments in the prefabricated elevator shaft are cleaned. Intermittent sliding grooves are set on the inner arc surface of the prefabricated elevator shaft pipe segments, and the spiral escalator is connected to the prefabricated elevator shaft pipe segments through studs and sliding grooves.

[0014] In a preferred embodiment, the present invention can be further configured as follows: In step S6, the vertical micro-shield is transported to the location of the sump pit in the left tunnel, the vertical micro-shield is installed, and the initial excavation is completed using the sleeve method. The cutterhead of the vertical micro-shield cuts special segments into the soil, and the slag is discharged using a slurry circulation system. The equipment is pushed downward by a power jack, and after reaching the designated depth, the bottom sealing grouting and shell removal retreat construction is carried out, leaving the outer shell in the soil. The portal is temporarily sealed with polyurethane at the starting portal location, and then the starting sleeve and the steel pipe section exposed in the main tunnel are cut off. After the trolley is transported out of the tunnel, prefabricated assembled pipe sections are installed in it to complete the construction of the sump pit in the left tunnel. The above steps are repeated to complete the construction of the sump pit in the right tunnel. After the sump pit construction is completed, prefabricated assembled platform panels are installed in the left and right tunnels.

[0015] In a preferred embodiment, the present invention can be further configured as follows: In step S7, the vertical elevator is placed in the middle of the prefabricated elevator shaft, and slots are provided on the outer periphery of the vertical elevator. The positions of the slots correspond to the studs on the outer periphery of the spiral escalator. The spiral escalator includes an ascending escalator and a descending escalator arranged side by side. The outer side of the ascending escalator is connected to the prefabricated elevator shaft pipe section by studs, and the descending escalator is connected to the vertical elevator by studs on the outer side. Passengers enter and exit the subway station through the spiral escalator and the vertical elevator.

[0016] In a preferred embodiment, the present invention can be further configured as follows: in step S7, embedded parts are arranged at intervals of the prefabricated elevator shaft pipe sections, and support beams are installed below the middle of the ascending escalator and descending escalator and below the escalator platform. One end of the support beam is firmly connected to the embedded parts on the prefabricated elevator shaft pipe section, and the other end is connected to the outer periphery of the vertical elevator to serve as a support for the spiral escalator.

[0017] In summary, the present invention has the following beneficial effects: the entire subway station structure is constructed using mechanical methods, which improves construction efficiency, has a high degree of mechanization, reduces construction safety risks, improves construction quality, reduces the labor intensity of workers, and has little impact on the surrounding environment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the planar structure of Example 1; Figure 2 This is a schematic diagram of the elevation structure of Example 1; Figure 3 This is a structural schematic diagram of the prefabricated water collection pit in Example 1; Figure 4 These are the construction drawings for the left and right tunnels in Example 2; Figure 5 This is the construction drawing of the prefabricated elevator shaft in Example 2; Figure 6 This is the construction drawing of the prefabricated elevator shaft in Example 2; Figure 7 This is a construction drawing of the underground passage in Example 2; Figure 8 This is the elevation construction drawing of the underground passage in Example 2; Figure 9 This is a construction drawing of the remaining underground passage in Example 2; Figure 10 This is the elevation construction drawing of the remaining underground passage in Example 2; Figure 11 This is the construction drawing of the prefabricated sump pit in Example 2; Figure 12 This is the elevation construction drawing of the prefabricated sump pit in Example 2; Figure 13 This is a construction drawing of the platform slab in Example 2; Figure 14 This is a plan view of the spiral escalator and vertical elevator in Example 2; Figure 15 This is the elevation construction drawing of the spiral escalator and vertical elevator in Example 2; Figure 16 These are construction drawings for the spiral escalator and vertical lift in Example 2.

[0019] Attached reference numerals: 1. Left tunnel; 2. Right tunnel; 3. Prefabricated sump; 31. Steel pipe section; 32. Maintenance compartment; 33. Sump; 34. Prefabricated pump room; 35. Backfill concrete; 4. Underground passage; 5. Prefabricated elevator shaft; 51. Spiral escalator; 52. Vertical elevator; 53. Ascending escalator; 54. Descending escalator; 6. Ground station hall; 7. Turnstile. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Example 1: like Figure 1 , Figure 2 As shown, a fully mechanized prefabricated subway station includes a left-line tunnel 1, a right-line tunnel 2, a prefabricated sump pit 3, an underground passage 4, a prefabricated elevator shaft 5, and a ground-level station hall 6.

[0022] like Figure 1 , Figure 2 As shown, left-line tunnel 1 and right-line tunnel 2 are arranged side by side, with circular, horseshoe-shaped, or rectangular cross-sections. Left-line tunnel 1 and right-line tunnel 2 are train stopping tunnels, and both are constructed using mechanical methods. Prefabricated sump pits 3 are installed inside left-line tunnel 1 and right-line tunnel 2 to collect wastewater generated by the station. Prefabricated sump pits 3 can be integral or segmented, and are constructed using vertical micro-shield methods.

[0023] like Figure 1 , Figure 2 As shown, underground passage 4 connects left tunnel 1 and right tunnel 2 for pedestrian passage. Underground passage 4 is constructed using mechanical methods (pipe jacking machine or tunnel boring machine). Prefabricated elevator shaft 5 connects underground passage 4 to ground station hall 6 for pedestrian access.

[0024] like Figure 2 As shown, a spiral escalator 51 and a vertical lift 52 are installed in the prefabricated elevator shaft 5. The vertical lift 52 is located in the middle of the prefabricated elevator shaft 5, and the spiral escalator 51 surrounds the vertical lift 52 and is arranged in a spiral shape.

[0025] like Figure 2 As shown, one side of the spiral escalator 51 is connected to the prefabricated elevator shaft 5, and the other side is connected to the outer structure of the vertical elevator 52. The spiral escalator 51 includes an ascending escalator 53 and a descending escalator 54. The upper and lower ends of the ascending escalator 53 and the descending escalator 54 are connected to the escalator platform.

[0026] like Figure 1 , Figure 2 As shown, the ground station hall 6 is equipped with a turnstile 7, which is located outside the prefabricated elevator shaft 5 and serves as a pedestrian passage.

[0027] like Figure 2 , 3 As shown, the prefabricated sump pit 3 includes a steel pipe section 31 located below the left tunnel 1 and the right tunnel 2. A prefabricated pump house 34 is installed inside the steel pipe section 31. The prefabricated pump house 34 is divided into an upper maintenance chamber 32 and a lower sump 33. Backfill concrete 35 is installed between the prefabricated pump house 34 and the steel pipe section 31.

[0028] Example 2: like Figures 4-16 As shown, a method for constructing a fully mechanized prefabricated subway station includes the following steps: S1, the location of the fully mechanized station and the location of the tunnel section are selected according to the plan.

[0029] S2, at the far end of the fully mechanized station, in the open-cut station or open-cut shaft, the tunnel boring machine is lowered into the shaft for assembly and to begin tunneling. The cutterhead cuts the soil, removes slag, assembles the tunnel segments, and grouts simultaneously. When it reaches the receiving shaft, it is received, disassembled and hoisted out, thus achieving tunnel breakthrough and completing the breakthrough construction of the left tunnel 1 and right tunnel 2 of the fully mechanized station.

[0030] During construction, special segments were assembled according to the selected locations of underground passage 4 and prefabricated sump pit at the station location. These special segments are reinforced concrete glass fiber reinforced segments, with the glass fiber reinforced parts being the opening locations for underground passage 4 and prefabricated sump pit.

[0031] S3. Based on the location of the fully mechanized station, the location of the prefabricated elevator shaft 5 is selected between the left-line tunnel 1 and the right-line tunnel 2. The location of the prefabricated elevator shaft 5 is on the center of the underground passage 4 of the left and right lines and is arranged symmetrically.

[0032] The prefabricated elevator shaft 5 is constructed using a shaft tunneling machine. A starting shaft structure is built around the prefabricated elevator shaft 5. This shaft structure consists of a first concrete pipe section with a cutting edge and at least one ordinary concrete pipe section. First, a reinforced concrete interlocking ring beam is constructed around the prefabricated elevator shaft 5. Soil is excavated within the interlocking ring beam, and at least one ordinary concrete pipe section is installed into the interlocking ring beam. Each pipe section forms a complete ring, and the pipe sections are connected by bolts. Waterproofing measures are implemented between the pipe sections. The shaft tunneling machine and its supporting equipment are then installed. The three mechanical arms of the shaft tunneling machine are firmly pressed against the shaft wall of the starting shaft structure. A rotating milling head is installed on the telescopic arm below the mechanical arms, with cutting teeth installed on the milling head. The soil is excavated at the bottom of the shaft, completing the excavation of the entire shaft cross-section. The excavated soil is pumped to the surface using a mud pump for mud-water separation.

[0033] The shaft boring machine (TBM) is connected to the locking ring beam via four hydraulic cylinders and to the first reinforced concrete pipe section with cutting edges via steel wire ropes. During excavation, the entire shaft structure is held in place and lowered. For each pipe section the TBM excavates, a new pipe section is installed above the topmost exposed section. Settlement modules are then used to lower all pipe sections, completing one cycle of construction until the required depth for the prefabricated elevator shaft (section 5) is met. Underwater sealing concrete is then poured. After the required strength is achieved, excess mud and water above the sealing concrete are removed, and a concrete guide platform is constructed as a guide base for the later reverse-pull method pipe jacking machine as it passes through the elevator shaft. The pipe section connecting to underground passage 4 uses special reinforced concrete, and fiberglass reinforcement is used at the opening to facilitate cutting by the TBM cutterhead.

[0034] S4. Assemble a reverse-pull pipe jacking machine in the left tunnel 1 and right tunnel 2, and construct the underground passage 4 between the left tunnel 1 and right tunnel 2 and the prefabricated elevator shaft 5.

[0035] The reverse-pull pipe jacking machine was transported to the junction of the left-line tunnel 1 and the underground passage 4. The reverse-pull pipe jacking machine was installed, and the initial excavation was completed using the sleeve method. The pipe jacking machine's cutterhead cut special segments into the soil, followed by muck removal and pipe section assembly. The excavated soil from the underground passage 4 was backfilled into the prefabricated elevator shaft 5. The backfill height was calculated based on the water and soil pressure at the underground passage 4 to ensure that no water or sand inrush occurred when the pipe jacking machine entered the prefabricated elevator shaft 5, thus guaranteeing the safety of the first pipe jacking machine reception operation.

[0036] The pipe jacking machine first cuts and grinds through the special pipe section of the prefabricated elevator shaft 5, and excavates to the concrete guide platform, completing the first receiving construction. It then excavates along the direction of the guide platform to the junction of the underground passage 4 on the other side of the prefabricated elevator shaft 5 and the prefabricated elevator shaft 5. The pipe jacking machine cuts through the special pipe section to complete the second launch and continues to excavate towards the right tunnel 2. A receiving trolley is installed in the right tunnel 2 in advance, and a receiving sleeve is installed inside the receiving trolley. The pipe jacking machine cuts through the special pipe segment of the right tunnel 2 and enters the receiving sleeve to complete the pipe jacking machine receiving. The receiving trolley is then moved to the ground, and the facilities and equipment at the starting end are moved to the ground for maintenance. After maintenance, the reverse-pull method pipe jacking machine is lowered back into the shaft for reassembly, and the construction of the second underground passage 4 begins. The above steps are repeated until the construction of the second underground passage 4 is finally completed.

[0037] After the underground passage 4 is completed, grouting is performed at the junction to stop the water flow. After the grouting reinforcement meets the requirements, the mud, water, and pipe sections inside the prefabricated elevator shaft 5 are cleaned. Intermittent sliding grooves are set on the inner arc surface of the pipe sections of the prefabricated elevator shaft 5, and the spiral escalator 51 is connected to the pipe sections of the prefabricated elevator shaft 5 through studs and sliding grooves.

[0038] S5. Assemble a reverse-pull pipe jacking machine within the first underground passage 4 to construct the third underground passage 4. Following the construction steps of the first and second underground passages 4, complete the connection of the entire underground passage 4. Construct the portal ring beam at the junction of the three underground passages 4 with the left tunnel 1, the right tunnel 2, and the prefabricated elevator shaft 5.

[0039] S6. Assemble vertical micro-shields in the formed left tunnel 1 and right tunnel 2, and construct sump pits. After the sump pits are completed, construct the platform slabs for left tunnel 1 and right tunnel 2.

[0040] The vertical micro-shield was transported to the sump location of the left tunnel 1, installed, and the initial excavation was completed using the sleeve method. The cutterhead of the vertical micro-shield cut special segments into the soil, and a slurry circulation system was used to remove the slag. Power jacks were used to push the equipment downwards to the designated depth. After reaching the designated depth, bottom sealing grouting and shell removal were carried out, leaving the outer shell in the soil. Polyurethane was injected to temporarily seal the tunnel entrance at the starting portal location. Then, the starting sleeve and the steel pipe section 31 exposed in the main tunnel were cut off. After the trolley was transported out of the tunnel, prefabricated assembled pipe sections were installed inside, completing the construction of the sump of the left tunnel 1. The above steps were repeated to complete the construction of the sump of the right tunnel 2. After the sump construction was completed, prefabricated assembled platform slabs were installed in the left tunnel 1 and the right tunnel 2.

[0041] S7, construct a ground-level station hall 6 at the location of the prefabricated elevator shaft 5, and install a spiral escalator 51 and a vertical elevator 52 inside the prefabricated elevator shaft 5.

[0042] The vertical lift 52 is placed in the middle of the prefabricated elevator shaft 5. The vertical lift 52 has slots on its outer periphery, and the position of the slots corresponds to the studs on the outer periphery of the spiral escalator 51. The spiral escalator 51 includes an ascending escalator 53 and a descending escalator 54 arranged side by side. The outside of the ascending escalator 53 is connected to the pipe section of the prefabricated elevator shaft 5 by studs, and the descending escalator 54 is connected to the vertical lift 52 by studs on its outside. Passengers enter and exit the subway station through the spiral escalator 51 and the vertical lift 52.

[0043] Embedded parts are arranged at intervals in the prefabricated elevator shaft 5 pipe sections. Support beams are installed at the lower middle part of the ascending escalator 53 and descending escalator 54 and below the escalator platform. One end of the support beam is firmly connected to the embedded parts on the prefabricated elevator shaft 5 pipe section, and the other end is connected to the outer periphery of the vertical elevator 52 to serve as a support for the spiral escalator 51.

[0044] S8, the ground station hall 6, is equipped with turnstiles 7, a central control room, and other functional rooms required for the subway station, thus completing the construction of the subway station.

[0045] The specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A construction method for a fully mechanized prefabricated subway station, applicable to fully mechanized prefabricated subway stations, characterized in that: The fully mechanized prefabricated subway station includes a left tunnel (1), a right tunnel (2), a prefabricated sump pit (3), an underground passage (4), a prefabricated elevator shaft (5), and a ground-level station hall (6). The left tunnel (1) and the right tunnel (2) are arranged side by side and have circular, horseshoe-shaped, or rectangular cross-sections. The prefabricated sump pit (3) is located inside the left tunnel (1) and the right tunnel (2) and is used to collect wastewater generated by the station. The underground passage (4) connects the left tunnel (1) and the right tunnel (2). The prefabricated elevator shaft (5) connects the underground passage (4) and the ground-level station hall (6). The prefabricated water collection pit (3) includes a steel pipe section (31) located below the left tunnel (1) and the right tunnel (2). A prefabricated pump house (34) is installed inside the steel pipe section (31). The prefabricated pump house (34) is divided into an upper maintenance chamber (32) and a lower water collection chamber (33). Backfill concrete (35) is installed between the prefabricated pump house (34) and the steel pipe section (31). Specifically, the steps include the following: S1, the location of the fully mechanized station and the location of the tunnel section are selected according to the plan; S2, at the far end of the open-cut station or open-cut shaft of the fully mechanized station, the shield machine is lowered into the shaft for assembly and excavation. The cutterhead cuts the soil, removes slag, assembles the segments, and grouts simultaneously. When it reaches the receiving shaft, it is received, disassembled and hoisted out to achieve tunnel breakthrough. The breakthrough construction of the left line tunnel (1) and right line tunnel (2) of the fully mechanized station is completed. During the construction, special segments are assembled according to the underground passage (4) and the prefabricated sump pit location of the selected station location. The special segments are reinforced concrete glass fiber reinforced segments. The glass fiber reinforced part is the location of the underground passage (4) and the prefabricated sump pit opening. S3, based on the location of the fully mechanized station, the location of the prefabricated elevator shaft (5) is selected between the left tunnel (1) and the right tunnel (2). The location of the prefabricated elevator shaft (5) is on the center of the underground passage (4) of the left and right lines and is arranged symmetrically. The prefabricated elevator shaft (5) is constructed using a vertical shaft excavator. S4, assemble the reverse pull pipe jacking machine in the left tunnel (1) and the right tunnel (2) to construct the underground passage (4) between the left tunnel (1) and the right tunnel (2) and the prefabricated elevator shaft (5); S5, assemble the reverse pull method pipe jacking machine in the first underground passage (4) to construct the third underground passage (4), refer to the construction steps of the first and second underground passages (4) to complete the connection of the entire underground passage (4); construct the portal ring beam at the junction of the three underground passages (4) with the left tunnel (1), the right tunnel (2) and the prefabricated elevator shaft (5); S6. Assemble vertical micro-shields in the formed left-line tunnel (1) and right-line tunnel (2) and construct sump pits; after the sump pits are completed, construct the platform slabs for the left-line tunnel (1) and right-line tunnel (2); transport the vertical micro-shields to the sump pit position of the left-line tunnel (1), install the vertical micro-shields, and complete the initial excavation using the sleeve method. The vertical micro-shield cutterhead cuts special segments into the soil, and the slurry circulation system is used to remove the slag. The equipment is pushed downwards by power jacks, and sealing is carried out after reaching the designated depth. The bottom grouting shell removal and retreat construction is carried out, leaving the shell in the soil. Polyurethane is injected to temporarily seal the tunnel entrance at the starting portal position. Then the starting sleeve and the steel pipe section (31) exposed in the main tunnel are cut off. After the trolley is transported out of the tunnel, prefabricated assembled pipe sections are installed in it to complete the construction of the sump pit of the left tunnel (1). The above steps are repeated to complete the construction of the sump pit of the right tunnel (2). After the sump pit construction is completed, prefabricated assembled platform panels are installed in the left tunnel (1) and the right tunnel (2). S7, construct a ground station hall (6) at the location of the prefabricated elevator shaft (5), and install a spiral escalator (51) and a vertical elevator (52) inside the prefabricated elevator shaft (5); S8, the turnstiles (7) and the central control room are installed in the ground station hall (6), and the construction of the subway station is finally completed.

2. The construction method of a fully mechanized prefabricated subway station according to claim 1, characterized in that: The prefabricated elevator shaft (5) is equipped with a spiral escalator (51) and a vertical elevator (52). The vertical elevator (52) is located in the middle of the prefabricated elevator shaft (5). The spiral escalator (51) surrounds the vertical elevator (52) and is arranged in a spiral shape. One side of the spiral escalator (51) is connected to the prefabricated elevator shaft (5), and the other side is connected to the outer structure of the vertical elevator (52). The spiral escalator (51) includes an ascending escalator (53) and a descending escalator (54). The upper and lower ends of the ascending escalator (53) and the descending escalator (54) are connected to the escalator platform.

3. The construction method of a fully mechanized prefabricated subway station according to claim 2, characterized in that: The ground station hall (6) is equipped with a turnstile (7), which is located outside the prefabricated elevator shaft (5).

4. The construction method of a fully mechanized prefabricated subway station according to claim 1, characterized in that: In step S3, a starting shaft structure is constructed around the prefabricated elevator shaft (5). The shaft structure consists of a first concrete pipe section with a cutting edge and at least one ordinary concrete pipe section. First, a reinforced concrete interlocking ring beam is constructed around the prefabricated elevator shaft (5). Soil is excavated within the interlocking ring beam. The first concrete pipe section with a cutting edge and at least one ordinary concrete pipe section are installed into the interlocking ring beam. Each pipe section forms a complete ring. The pipe sections are connected by bolts. Waterproofing measures are implemented between the pipe sections. A shaft excavator and its supporting equipment are installed. The three mechanical arms of the shaft excavator are firmly pressed against the shaft wall of the starting shaft structure. A rotatable milling head is installed on the telescopic arm below the mechanical arm. Cutting teeth are installed on the milling head. Soil is excavated at the bottom of the shaft to complete the excavation of the entire shaft section. The excavated soil is removed by a mud pump. The slag pump is sent to the ground for mud-water separation; the shaft tunneling machine is connected to the lock ring beam through four hydraulic cylinders, and connected to the first reinforced concrete pipe section with cutting edge through steel wire rope. During the excavation process, the entire shaft structure is pulled up and sunk; for each section of pipe the shaft tunneling machine excavates, a new pipe section is installed above the top pipe section exposed on the ground. Then, the settlement module is used to sink all the pipe sections to complete one cycle of construction until the depth requirement of the prefabricated elevator shaft (5) is met. Underwater bottom sealing concrete is poured. After the strength meets the requirements, the excess mud and water above the bottom sealing concrete is pumped out, and a concrete guide platform is constructed as the guide base for the later reverse pull method pipe jacking machine to pass through the elevator shaft; the pipe section connected to the underground passage (4) is made of special reinforced concrete pipe section, and the opening position is made of glass fiber reinforcement so that the tunneling machine cutter head can cut.

5. The construction method of a fully mechanized prefabricated subway station according to claim 1, characterized in that: In step S4, the reverse-pull method pipe jacking machine is transported to the junction of the left tunnel (1) and the underground passage (4), and the reverse-pull method pipe jacking machine is installed. The initial excavation is completed using the sleeve method. The pipe jacking machine cutter head cuts special pipe segments into the soil, and the slag is discharged and the pipe sections are assembled. The slag and soil of the underground passage (4) are backfilled in the prefabricated elevator shaft (5). The backfilling height is calculated based on the water and soil pressure at the underground passage (4) to ensure that no water or sand surge occurs when the pipe jacking machine enters the prefabricated elevator shaft (5), and to ensure the safety of the first pipe jacking machine reception construction. The pipe jacking machine cuts and grinds through the special pipe segments of the prefabricated elevator shaft (5) for the first time, and excavates to the concrete guide platform to complete the first reception construction. It then excavates along the direction of the guide platform to the junction of the underground passage (4) and the prefabricated elevator shaft (5) on the other side. The pipe jacking machine cuts the special pipe segments to complete the first reception construction. The second start continues the excavation of the right tunnel (2). A receiving trolley is installed in the right tunnel (2) in advance. A receiving sleeve is installed in the receiving trolley. The pipe jacking machine cuts the special segments of the right tunnel (2) and enters the receiving sleeve to complete the pipe jacking machine reception. The receiving trolley is moved to the ground and the facilities and equipment at the starting end are moved to the ground for inspection. After the inspection is completed, the reverse pull pipe jacking machine is lowered into the well again for assembly and the construction of the second underground passage (4) begins. The above steps are repeated until the construction of the second underground passage (4) is completed. After the underground passage (4) is completed, grouting is performed at the junction to stop the water. After the grouting reinforcement meets the requirements, the mud and water and pipe sections in the prefabricated elevator shaft (5) are cleaned. Intermittent sliding grooves are set on the inner arc surface of the prefabricated elevator shaft (5). The spiral escalator (51) is connected to the prefabricated elevator shaft (5) pipe section through studs and sliding grooves.

6. The construction method of a fully mechanized prefabricated subway station according to claim 1, characterized in that: In step S7, the vertical elevator (52) is placed in the middle of the prefabricated elevator shaft (5). The vertical elevator (52) has slots on its outer periphery, and the position of the slots corresponds to the studs on the outer periphery of the spiral escalator (51). The spiral escalator (51) includes an ascending escalator (53) and a descending escalator (54) arranged side by side. The outside of the ascending escalator (53) is connected to the pipe section of the prefabricated elevator shaft (5) through studs, and the descending escalator (54) is connected to the vertical elevator (52) through the studs on its outside. Passengers enter and exit the subway station through the spiral escalator (51) and the vertical elevator (52).

7. The construction method of a fully mechanized prefabricated subway station according to claim 6, characterized in that: In step S7, embedded parts are arranged at the intervals of the prefabricated elevator shaft (5) pipe sections. Support beams are installed below the middle of the ascending escalator (53) and descending escalator (54) and below the escalator platform. One end of the support beam is firmly connected to the embedded parts on the prefabricated elevator shaft (5) pipe section, and the other end is connected to the outer periphery of the vertical elevator (52) to serve as a support for the spiral escalator (51).

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