A construction method for a flat-roofed, column-supported subway station node trolley

Abstract

This invention discloses a construction method for a flat-roofed, column-supported subway station node using a trolley. The method includes a subway station structure and a trolley. The subway station structure comprises a base slab, a top slab, side walls, a central beam, and a central column. The base slab, side walls, central beam, and central column are prefabricated, while the base slab and central column are cast-in-place. The trolley includes a bottom trolley, a top trolley, and a central column trolley. Two bottom trolleys are provided, each positioned within the space enclosed by the central beam, side walls, and base slab. This construction method is applicable to flat-roofed, column-supported, rectangular prefabricated, partially prefabricated, cast-in-place prefabricated subway stations. It is highly practical, employing a streamlined operation method that allows for the one-time assembly of the lower side walls, central slab, and central threaded rods, providing horizontal support for the enclosure structure. It eliminates the need for replacement supports, improving trolley utilization and significantly increasing construction efficiency.

Description

Technical Field

[0001] This invention relates to a subway station construction method, and more particularly to a construction method for a subway station node trolley with a flat roof and columns. Background Technology

[0002] With the development of subway construction technology, more and more subway stations are adopting prefabricated subway station structures. However, for subway stations with large and heavy prefabricated structures, a lot of construction equipment is required, and the construction process is relatively cumbersome and labor-intensive. In the prefabricated structure with fully precast and partially cast-in-place nodes, there is a wet joint between the column and the base slab in the cross-section structure, which has a time limit for equalization and affects the construction speed. Some existing cast-in-place subway stations use integrated trolley equipment for auxiliary construction, but the trolley assembly construction process directly affects the efficiency of the subway station. The existing trolley assembly construction process is only suitable for fully cast-in-place or fully precast subway stations. The existing trolley assembly construction process requires the removal of the first support before the side wall can be assembled. Therefore, it is necessary to replace the support and hoist and assemble ring by ring, which limits the assembly efficiency of prefabricated subway stations. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention provides a highly efficient construction method for subway station nodes using a modular trolley for streamlined operations of fully prefabricated subway stations with partial cast-in-place joints. This method allows for the one-time assembly of the lower side walls, middle slab, and central lead screw.

[0004] The technical solution adopted by this invention to solve its technical problem is: a construction method for a flat-topped, column-supported subway station node using a trolley, characterized in that a set of base slabs, top slabs, side walls, central beams, and central columns of the subway station form a ring frame; the subway station includes multiple sets of spliced ​​base slabs, top slabs, side walls, central beams, and central columns ring frames; during the construction of the subway station, four ring frames form a group, and the subway station is constructed from multiple sets of ring frames; trolleys are set at the installation positions of the base slabs, top slabs, side walls, central beams, and central columns; the trolleys include bottom trolleys, top trolleys, and central column trolleys; two bottom trolleys are set, each set within the space enclosed by the central beams, side walls, and base slabs, and one bottom trolley is set on each side of the central column; the central column trolley is set between the two bottom trolleys; and the top trolley is set within the space between the top slabs, side walls, and central beams; the base slabs, top slabs, side walls, central beams, and central columns of the subway station are constructed using trolleys, and a continuous cyclical construction process is formed through grouping.

[0005] As an improvement to the above technical solution, the continuous cyclic construction of subway stations using trolleys includes the following steps: S1: Use a gantry crane to hoist the first and second sets of ring frame bottom plates; S2: The last central column of the first and second ring frames is installed using a central column support platform suspended in the middle of the bottom trolley; S3: The lower side walls, middle plate, middle beam and screw rod of the first group of ring frames are constructed using a bottom trolley; S4: The upper side wall and top plate components of the first ring frame are constructed using a top trolley; S5: Use a gantry crane to hoist the bottom plate of the third set of ring frames; S6: The lower side wall middle plate and the outer middle threaded rod of the middle plate side wall of the second ring frame are constructed using a bottom trolley. S7: The upper side wall and top plate components of the second ring frame are constructed using a top trolley; S8: Use a gantry crane to hoist the base plate of the fourth set of ring frames; S9: Proceed with the construction of the remaining ring frame groups of the subway station in sequence.

[0006] As a further improvement to the above technical solution, the bottom trolley includes a retractable central column working platform, a retractable side wall working platform, a traveling mechanism, an adjustable cantilever crane, a tensioning device, a side wall vacuum suction cup device, and a side wall scaffolding device. The retractable central column working platform, the retractable side wall working platform, the traveling mechanism, the adjustable cantilever crane, the tensioning device, the side wall vacuum suction cup device, and the side wall scaffolding device are all connected by the trolley steel structure. The bottom trolley is also equipped with a middle plate installation trolley.

[0007] As a further improvement to the above technical solution, in S3 and S6, the middle plate of the first and second ring frames is constructed using a middle plate installation trolley on the bottom trolley; the lower side walls and middle plate side walls of the first and second ring frames are constructed using the side wall support platform and the operation tensioning platform on the outside of the bottom trolley; and the middle beams of the first and second ring frames are constructed using the bottom trolley.

[0008] As a further improvement to the above technical solution, the side wall is first hoisted and positioned by a gantry crane during installation. Then, the side wall is tensioned by the vacuum adsorption component on the tensioning platform. After being tensioned to the installation position, the side wall is hoisted down by the gantry crane.

[0009] As a further improvement to the above technical solution, the middle plate installation trolley on the bottom trolley includes a transverse moving plate, a longitudinal moving plate, and a lifting plate. The transverse moving plate and the longitudinal moving plate are used for leveling during the installation of the middle plate, and the lifting plate is used to send the middle plate into the installation position.

[0010] As a further improvement to the above technical solution, the top trolley includes a retractable middle working platform, a retractable lower working platform, a scissor lift platform, and a tensioning device. The retractable middle working platform, the retractable lower working platform, the traveling mechanism, the scissor lift platform, and the tensioning device are all connected by the trolley's steel structure.

[0011] As a further improvement to the above technical solution, when installing the top plate, the top of the side wall to which the top plate is to be installed is first tensioned by the top plate installation platform, and then the top plate is hoisted to the installation location by a gantry crane. Then, the top plate is moved to the installation position by the longitudinal sliding support plate on the top plate installation platform, while the gantry crane hoists the top plate.

[0012] As a further improvement to the above technical solution, the central column trolley includes a movable central column working platform, a traveling mechanism, a scissor lift platform, and a central column straightening fixture, all of which are connected by a steel structure.

[0013] As a further improvement to the above technical solution, the bottom trolley structure, the top trolley structure, and the central column trolley structure are all equipped with a hydraulic system for driving and an electronic control system for control.

[0014] The beneficial effects are as follows: The trolley assembly construction method of this invention is applicable to prefabricated subway stations with flat-topped, column-supported rectangular prefabricated partial nodes, offering strong practicality. It allows for precise adjustment of the position of each assembly panel by coordinating two bottom trolleys, one top trolley, and one central column trolley with the prefabricated subway station components forming the ring frame, thereby improving assembly quality. Furthermore, we have adopted a streamlined operation method, enabling the one-time assembly of the lower sidewalls, middle slab, and central threaded rods, providing horizontal support for the enclosure structure without the need for replacement supports, thus increasing the utilization rate of the trolleys and significantly improving construction efficiency. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the construction status of the present invention; Figure 2 This is a schematic diagram of the construction of the present invention, S1; Figure 3 This is a schematic diagram of the S2 construction of the present invention; Figure 4 This is a schematic diagram of the S3 construction of the present invention; Figure 5 This is a schematic diagram of the S4 construction method of the present invention; Figure 6 This is a schematic diagram of the S5 construction of the present invention; Figure 7 This is a schematic diagram of the S6 construction of the present invention; Figure 8 This is a schematic diagram of the S7 construction of the present invention; Figure 9 This is a construction schematic diagram of S8 of the present invention.

[0017] 1. Bottom trolley; 2. Top trolley; 3. Central column trolley; 4. Base plate; 5. Top plate; 6. Side wall; 7. Central beam; 8. Central column. Detailed Implementation

[0018] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0019] Reference Figure 1The prefabricated subway station is longitudinally arranged with central beams 7 and central columns 8. The central column 8 is wet-jointed to the base slab 4. This joint requires sufficient strength before the central beam 7 can be joined. All other components are prefabricated. A set of base slabs 4, top slabs 5, side walls 6, central beams 7, and central columns 8 form a ring frame in the subway station. The subway station includes multiple sets of spliced ​​ring frames of base slabs 4, top slabs 5, side walls 6, central beams 7, and central columns 8; during construction, four ring frames constitute one set. The prefabricated subway station is longitudinally arranged with central beams 7 and central columns 8. The base slab 4 and central columns 8 are connected by cast-in-place concrete. The central column 8 is wet-jointed to the base slab 4. This joint requires a waiting period until the connection strength at the joint is sufficient before the central beam 7 can be joined. The central columns 8 are spaced four ring frames apart. To improve assembly efficiency, a streamlined assembly process using trolleys is adopted. The trolley can first construct the base slab 4 and central columns 8, and while the central columns 8 are being strengthened, other related structures can be constructed. The installation positions of the base plate 4, top plate 5, side walls 6, central beam 7, and central column 8 are provided with trolleys. The trolleys include a bottom trolley 1, a top trolley 2, and a central column trolley 3. There are two bottom trolleys 1, which are respectively set in the space enclosed by the central beam 7, side walls 6, and base plate 4. One bottom trolley 1 is set on each side of the central column 8. The central column trolley 3 is set between the two bottom trolleys 1. The top trolley 2 is set in the space between the top plate 5, side walls 6, and central beam 7. The base plate 4, top plate 5, side walls 6, central beam 7, and central column of the subway station are constructed using trolleys, and a continuous, cyclical construction process is formed by grouping them.

[0020] Reference Figures 2 to 9 The construction of the aforementioned subway station using the aforementioned trolley includes the following steps: S1: Use a gantry crane to hoist the first and second sets of ring frame bottom plates 4; S2: The last central column 8 of the first and second ring frames is installed using the central column support platform suspended in the middle of the bottom trolley 1; Specifically, the installation process for the central column 8 is as follows: The gantry crane lifts the central column 8 and places it in its basic installation position, leaving a small gap between the bottom of the central column and the four mounting surfaces of the base plate. The operating platforms on the two bottom trolleys 1, located on either side of the column's installation position, are moved until their centers align with the center of the central column, then the anti-longitudinal displacement racks are locked. After locking, the rotating platforms on both sides are opened, and the movable clamps for adjustment are installed. The screws are adjusted to bring the clamps closer to the four corners of the central column. Based on the on-site survey results, adjusting one or two clamps is sufficient to complete the position adjustment of the central column. Then, the screws of the remaining two or three clamps are adjusted to ensure the clamps grip the central column tightly from the four corners.

[0021] S3: The lower side wall 6, middle plate, middle beam 7 and screw rod of the first group of ring frame are constructed using the bottom trolley 1; The specific installation process of the middle plate: The installation of the middle plate is completed by a middle plate installation trolley mounted on the bottom trolley 1. The middle plate installation trolley on the bottom trolley 1 includes a longitudinal moving plate, a transverse moving plate, and a lifting plate. The transverse and longitudinal moving plates are used for leveling during the installation of the middle plate, and the lifting plate is used to send the middle plate into the installation position. During installation, the lifting cylinder on the lifting plate is first activated. After the piston rod of the lifting cylinder is fully extended, it lifts the lifting plate. Then, the gantry crane lifts the middle plate and places it basically in the installation position. At this time, the bottom surface of the middle plate is about 50mm away from the receiving surface of the plate. Then, the longitudinal moving plate is activated, and the middle plate is slowly pushed by the longitudinal moving push plate. According to the design data after measurement, the horizontal angle of the middle plate is adjusted in the air. After the level of the middle plate and the installation position are measured and matched, the gantry crane is activated to lower the middle plate onto the receiving panel of the transverse moving and lifting plate. Then, according to the measurement results, the transverse moving plate is moved and the middle plate is adjusted so that the middle plate is basically aligned with the installation position. Next, the longitudinal support plate is moved slowly to send the middle plate into the installation position. The middle plate is stopped when it is about 50mm away from the installation position. Then, the piston rod of the lifting cylinder is slowly lowered. During the slow descent of the middle plate, the instrument is continuously used to measure. Then, the middle plate is adjusted by combining transverse movement, longitudinal movement and descent, and gradually aligned with the connection between the middle plate and the middle longitudinal beam and the connection between the middle plate and the six side wall pieces.

[0022] During installation, the side wall 6 is first lifted and positioned by a gantry crane, and then the side wall 6 is tensioned by the vacuum adsorption component on the tensioning platform. After being tensioned to the installation position, the side wall 6 is lifted down by the gantry crane.

[0023] The installation of side wall 6 is accomplished by a support platform and an operation tensioning platform suspended outside the bottom trolley 1. The specific installation process for side wall 6 is as follows: A gantry crane is used to lift side wall 6 and place it in its basic installation position, with the bottom of side wall 6 approximately 350-450mm from the upper surface of the four base plates. The support platform and its internal moving frame are operated and adjusted, and the push-pull screw on the vacuum suction cup is activated to make the outer surface of the vacuum suction cup parallel and close to the side wall 6 surface. Then, the vacuum pump unit is activated, allowing the vacuum suction cup to automatically adhere to the surface of side wall 6. At this point, the moving frame, through the vacuum suction cup, screw, and side wall 6, becomes a single unit. Following this, based on the survey results, the extension distance of the screw is adjusted to adjust the position of side wall 6 in the air. Once the position of side wall 6 is accurately adjusted, the gantry crane lowers side wall 6. The moving frame then follows side wall 6 as it descends, ensuring that the side wall 6 maintains its posture in the air and accurately lands.

[0024] After the six side wall sections are lowered to their corresponding installation positions, they still need to be tensioned. The tensioning platform of the six side wall sections mainly completes the tensioning of the lower and middle threaded steel bars of the six side wall sections. After the grouting and curing of the middle plate, the installation of the force transmission screws on both sides of the six side wall sections is completed, thus completing the conversion of the force system.

[0025] S4: The upper side wall 6 and top plate 5 of the first ring frame are constructed using the top trolley 2; S5: Use a gantry crane to hoist the bottom plate 4 of the third set of ring frames; During the installation of the top plate 5, the top of the side wall 6 to which the top plate 5 will be installed is first tensioned using the top plate 5 installation platform. Then, a gantry crane is used to hoist the top plate 5 above the installation location. Next, the longitudinal sliding support plate on the top plate 5 installation platform is used to move the top plate 5 to the installation position, while the gantry crane simultaneously hoists the top plate 5. The specific installation process of the top plate 5 is as follows: First, the top of the two side walls 6 is tensioned by adjusting the tensioning platforms on both sides of the top trolley 2, and the position of the top of the two side walls 6 is adjusted to make it easier to align the two side walls 6 with the top plate 5 for installation. Then, the gantry crane is used to hoist the top plate 5 to the installation location and place the top plate 5 in the basic installation position. At this time, the difference between the center of the top plate 5 and the axis is < ±100mm, and the distance between the receiving surface of the bottom of the top plate 5 and the receiving surface on the lifting cylinder is approximately 50mm. The longitudinal sliding support plate is moved, and the top plate 5 is slowly pushed along the mounting platform of the top plate 5. The horizontal angle of the top plate 5 is adjusted in the air according to the survey results. After accurate surveying, a gantry crane is used to lower the top plate 5 onto the receiving surface of the lifting support plate on the mounting platform of the top plate 5. Based on the survey results, the transverse sliding support plate is moved to align the top plate 5 with the installation position. Then, the longitudinal sliding support plate is moved slowly to deliver the top plate 5 into the installation position. During the slow descent of the top plate 5, the survey results are continuously considered, and the tenons of the top plate 5 are gradually aligned with the tenons of the previous ring's top plate 5 and the tenons of the side wall 6 by combining transverse, longitudinal, and gantry crane descent actions.

[0026] In addition, after the top slab 5 is in place, the tensioning operation of the top slab 5 needs to be completed by moving the tensioning platforms on both sides and the tensioning platform in the middle of the top trolley 2.

[0027] S6: The lower side wall 6 of the second ring frame and the middle plate of the middle plate side wall 6 are constructed using the bottom trolley 1; S7: The upper side wall 6 and top plate 5 of the second ring frame are constructed using the top trolley 2. S8: Use a gantry crane to hoist the bottom plate 4 of the fourth set of ring frames; S9: Proceed with the construction of the remaining ring frame groups of the subway station in sequence.

[0028] Following the above steps, the middle slab of the third ring frame can be constructed. The side wall 6 of the second ring frame is constructed using the support platform and tensioning platform on the outer side of the bottom trolley 1. The middle beam 7 of the second ring frame is then constructed using the bottom trolley 1. Next, the bottom slab 4 of the fifth ring frame and the last middle column 8 of the fifth ring frame are constructed. Finally, the top slab 5 of the third ring frame is constructed. This process continues until the subway station composed of multiple ring frames is completed. By moving the trolleys, the installation process is integrated with the trolleys, and the bottom slab 4 and middle column 8 are assembled in a pre-assembly mode, making full use of the lower trolleys and greatly improving construction efficiency.

[0029] The bottom trolley 1 mainly consists of upper and lower construction platform layers, on which other auxiliary construction structures are installed. Specifically, the bottom trolley 1 includes a retractable central column work platform, a retractable side wall 6 work platform, a traveling mechanism, an adjustable cantilever crane, a tensioning device, a side wall 6 vacuum suction cup device, and a side wall 6 plank device. These components are all connected by the trolley's steel structure. The upper work platform also features a 300mm wide side wall 6 plank, which can be raised and lowered using ropes.

[0030] The retractable center column work platform is installed on one side of the retractable side wall 6 work platform. Because the center column is prone to deviating from the central axis during platform installation, the retractable center column work platform is extendable. This allows it to pass through different locations and install the center column at a greater distance. The extension stroke of the retractable center column work platform on the bottom trolley 1 is 1.6 meters, and extension is generally driven by a hydraulic cylinder.

[0031] When operating, the telescopic sidewall 6 work platform needs to move within the installed sidewall 6 and also extend to work outside the sidewall 6. Therefore, the telescopic sidewall 6 work platform is also telescopic, with a travel of 1.6 meters. The telescopic movement is generally driven by a hydraulic cylinder.

[0032] The side wall 6 vacuum suction cup device is configured in conjunction with an adjustable boom. Preferably, the upper platform has the side wall 6 vacuum suction cup and an adjustable boom, while the lower platform has individual suction cups, side wall 6 vacuum suction cups, and an adjustable boom. The side wall 6 vacuum suction cup is connected to a vacuum pump, with the pump unit controlling the suction and a hydraulic cylinder controlling the extension and retraction. This helps maintain the verticality of the side wall 6 after it is basically in place.

[0033] The traveling mechanism consists of wheels located at the bottom of the two working platforms, with rail clamps installed on the wheels. During construction, the traveling mechanism uses a self-propelled device driven by the traveling motor for parking braking, and each traveling mechanism is equipped with a rail clamp, providing double parking braking. The rail clamps on the wheels also serve as a safety feature to prevent the trolley from tipping over.

[0034] The top trolley 2 has three working platforms (upper and lower) and can tension the top module and seven tensioning holes at different heights on the six side walls. The tracks of the top trolley 5 are installed on the supports of the two side walls 6, ensuring good stress distribution on the middle slab. The top trolley 2 includes a retractable middle working platform, a retractable lower working platform, a scissor lift platform, and a tensioning device. The retractable middle working platform, retractable lower working platform, traveling mechanism, scissor lift platform, and tensioning device are all connected by the trolley's steel structure.

[0035] The scissor lift platform is installed on the three-tiered construction platform of the top trolley 2. Preferably, seven scissor lift platforms are installed on the three-tiered construction platform, corresponding to the seven tensioning holes of the five top slabs and six side walls. The bottom of the scissor lift platform is supported by a lifting structure, preferably hydraulically driven and supported by connecting rods. This scissor lift platform has a lowered height of only 400mm and a raised height of up to 1.5 meters. The scissor lift platform is also equipped with casters and locking devices, allowing it to move and be fixed on the platform, facilitating alignment of the tensioning holes and placement of the tensioning equipment. Because the top trolley 2 uses a scissor lift platform, after the scissor platform is lowered, the entire top slab 5 platform can be moved into the top slab 5, with only the railings about 200mm outside the top slab 5, minimizing interference with the hoisting of the middle slab.

[0036] The central column trolley 3 includes a movable central column working platform, a traveling mechanism, a scissor lift platform, and a central column straightening fixture. The movable central column working platform, the scissor lift platform, and the central column straightening fixture are all connected by a steel structure.

[0037] During construction, the movable center column work platform is prone to deviating from its central axis position in different directions during the lowering of the column. Therefore, the platform for positioning the center column needs to be equipped with a lateral movement mechanism to adjust the column. The lateral movement mechanism consists of platform rollers and an electric push rod; preferably, the electric push rod has a stroke of 1.5 meters. After the column is positioned by the lateral movement mechanism, it is secured with screws to eliminate the gap between the rollers and the track. Lifting structures are installed on both sides of the center column work platform; preferably, the lifting structure can be raised to 4 meters for installing bolts for the central longitudinal beam and for straightening the center column. The center column straightening fixture is installed on the scissor lift platform, and the extension and retraction position of the clamp is controlled by a hydraulic cylinder to straighten the center column.

[0038] In addition, the bottom trolley 1 structure, the top trolley 2 structure, and the central column trolley 3 structure are all equipped with a hydraulic system for driving and an electronic control system for control.

[0039] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A construction method for a flat-roofed, column-supported subway station node trolley, characterized in that, The subway station comprises a set of base slabs, top slabs, side walls, central beams, and central columns forming a ring frame. The subway station includes multiple sets of spliced ​​ring frames of base slabs, top slabs, side walls, central beams, and central columns. During construction, four ring frames form a group, and the subway station is constructed from multiple sets of ring frames. Trolleys are installed at the installation positions of the base slabs, top slabs, side walls, central beams, and central columns. The trolleys include bottom trolleys, top trolleys, and central column trolleys. Two bottom trolleys are provided, each positioned within the space enclosed by the central beams, side walls, and base slabs. One bottom trolley is located on each side of the central column. The central column trolley is positioned between the two bottom trolleys, and the top trolley is positioned within the space between the top slab, side walls, and central beams. The subway station's base slab, top slab, side walls, central beams, and central columns are constructed using these trolleys, forming a continuous, cyclical construction process through grouping. The construction of subway stations using continuous trolley cycles includes the following steps: S1: Use a gantry crane to hoist the first and second sets of ring frame bottom plates; S2: The last central column of the first and second ring frames is installed using a central column support platform suspended in the middle of the bottom trolley; S3: The lower side walls, middle plate, middle beam and screw rod of the first group of ring frames are constructed using a bottom trolley; S4: The upper side wall and top plate components of the first ring frame are constructed using a top trolley; S5: Use a gantry crane to hoist the bottom plate of the third set of ring frames; S6: The lower side wall middle plate and the outer middle threaded rod of the middle plate side wall of the second ring frame are constructed using a bottom trolley. S7: The upper side wall and top plate components of the second ring frame are constructed using a top trolley; S8: Use a gantry crane to hoist the base plate of the fourth set of ring frames; S9: Proceed with the construction of the remaining ring frame groups of the subway station in sequence.

2. The construction method of a flat-roofed, column-supported subway station node trolley according to claim 1, characterized in that, The bottom trolley includes a retractable central column working platform, a retractable side wall working platform, a traveling mechanism, an adjustable cantilever crane, a tensioning device, a side wall vacuum suction cup device, and a side wall scaffolding device. The retractable central column working platform, the retractable side wall working platform, the traveling mechanism, the adjustable cantilever crane, the tensioning device, the side wall vacuum suction cup device, and the side wall scaffolding device are all connected by the trolley's steel structure. The bottom trolley is also equipped with a middle plate installation trolley.

3. The construction method of a flat-roofed, column-supported subway station node trolley according to claim 2, characterized in that, In S3 and S6, the middle plate of the first and second ring frames is constructed using a middle plate installation trolley on the bottom trolley. The lower side walls and middle plate side walls of the first and second ring frames are constructed using the side wall support platform and the operation tensioning platform on the outside of the bottom trolley. The middle beams of the first and second ring frames are constructed using the bottom trolley.

4. The construction method of a flat-roofed, column-supported subway station node trolley according to claim 3, characterized in that, During installation, the sidewall blocks are first lifted and positioned using a gantry crane. Then, the sidewall blocks are tensioned by the vacuum adsorption components on the tensioning platform. After being tensioned to the installation position, the gantry crane lifts the sidewall blocks downwards.

5. The construction method of a flat-roofed, column-supported subway station node trolley according to claim 2, characterized in that, The middle plate installation trolley on the bottom trolley includes a transverse moving plate, a longitudinal moving plate, and a lifting plate. The transverse moving plate and the longitudinal moving plate are used for leveling during the installation of the middle plate, and the lifting plate is used to send the middle plate into the installation position.

6. The construction method of a flat-roofed, column-supported subway station node trolley according to claim 1, characterized in that, The top trolley includes a retractable middle working platform, a retractable lower working platform, a scissor lift platform, and a tensioning device. The retractable middle working platform, the retractable lower working platform, the traveling mechanism, the scissor lift platform, and the tensioning device are all connected by the trolley's steel structure.

7. The construction method of a flat-roofed, column-supported subway station node trolley according to claim 6, characterized in that, During the installation of the top slab, the top of the side wall of the installation platform is first tensioned, and then the gantry crane is used to hoist the top slab to the installation location. Then, the longitudinal sliding support plate on the top slab installation platform is used to move the top slab to the installation position, while the gantry crane hoists the top slab.

8. The construction method of a flat-roofed, column-supported subway station node trolley according to claim 1, characterized in that, The central column trolley includes a movable central column working platform, a traveling mechanism, a scissor lift platform, and a central column straightening fixture. The movable central column working platform, the scissor lift platform, and the central column straightening fixture are all connected by a steel structure.

9. The construction method of a flat-roofed, column-supported subway station node trolley according to claim 1, characterized in that, The bottom trolley structure, top trolley structure, and central column trolley structure are all equipped with a hydraulic system for driving and an electronic control system for controlling.

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