A compound station construction method based on a mechanical method and a detachable small-pitch parallel pipe-jacking method

Abstract

The application discloses a kind of compound station construction method based on mechanical method and detachable small-pitch parallel pipe-jacking method, by setting working well, to utilize working well and hoist shield machine, simultaneously utilize shield machine to excavate platform layer tunnel, and then facilitate in the standard section of platform layer tunnel to make full concrete segment, and detachable steel segment is made at the connecting part corresponding to inclined passageway, and then facilitate subsequent disassembly operation;Further, by using the way of jacking three rows of small-pitch pipe-jacking, wherein the small-pitch pipe-jacking adopts detachable pipe-jacking with rectangular cross section, and then facilitate subsequent reinforcement on the whole;Then temporary vertical steel support frame is made in small-pitch pipe-jacking, and then the temporary segment is removed, and then permanent beam column is made between adjacent small-pitch pipe-jacking, and the temporary vertical steel support frame is removed;Finally, inclined passageway is made between platform layer and station hall layer.By using the above method, the problems of large difficulty in overall jacking, large difficulty in overall deep excavation, large difficulty in implementation on artificial fill soft clay bottom layer, and poor overall performance can be overcome, and the method has the advantages of efficient and convenient construction.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of subway station construction technology, and particularly relates to a composite station construction method based on a mechanical method and a detachable small-pitch parallel pipe-jacking method. BACKGROUND

[0002] In the traditional technology, when constructing an underground station, a traditional open excavation method and a traditional underground excavation method are usually used:

[0003] 1) When the traditional open excavation method is used, a large site is required for the construction of an underground station, and the standard station plane size is generally 250 meters * 20-25 meters. With the increasing perfection of urbanization construction, the basement and pile foundation volume of building structures are increasing, and there are many cases where the open excavation method cannot be used to construct the main structure of the station in the city center. At the same time, when the traditional open excavation method is used, the pre-construction work such as demolition and pipeline relocation must be completed before the next stage of construction.

[0004] 2) When the traditional underground excavation method is used, the volume of the main structure of the station is still large, and when the site is limited, the main structure of the station is still difficult to construct. At the same time, the underground excavation method has a high construction risk and low construction efficiency, so the use of the underground excavation method is becoming less and less.

[0005] Therefore, in the existing patent CN107559026A, a rectangular overall frame underground station structure (as shown in Figure 1 ) is proposed. This frame structure usually uses an overall pipe-jacking construction method. There are problems with the overall pipe-jacking scheme:

[0006] 1) If the overall frame structure is used, two rings of 15 meters * 15 meters or so are required, which requires a high top-pushing condition, is difficult to implement, and the existing pipe-jacking machine cannot meet the requirements. At the same time, the overall pipe segment has a large weight and size, and there are many difficulties in transportation (three-dimensional construction is difficult to transport), hoisting, etc.

[0007] 2) The overall frame structure can only implement a double-layer standard station, and the foundation of the building in the city center has a large burial depth. If the subway station is a two-story underground station, the vault burial depth of the front and rear intervals is about 10 meters, and the station must be selected in a place with a large open space.

[0008] 3) The implementation conditions of the pipe-jacking are limited, and can only be implemented in artificial fill, soft soil, and clay strata. If the construction range of the station is rock strata, the pipe-jacking cannot be implemented.

[0009] 4) The station in the patent is divided into segments every 2 meters, and a longitudinal whole is not formed, so the overall integrity is poor.

[0010] Therefore, the underground station construction method of the prior art still has room for improvement. SUMMARY

[0011] In order to overcome the defects of the prior art, the purpose of the present application is to provide a composite station construction method based on the mechanical method and the detachable small-pitch parallel pipe-jacking method, which can overcome the problems of large difficulty in overall jacking, large difficulty in overall deep excavation, large difficulty in implementation on the bottom layer of artificial fill soft clay, and poor integrity.

[0012] The purpose of the present application is achieved by the following technical solutions:

[0013] A composite station construction method based on the mechanical method and the detachable small-pitch parallel pipe-jacking method, comprising the following steps:

[0014] S10: excavating working wells at both ends of the station construction position of the subway station, and taking the working wells as part of the main structure of the subway station;

[0015] S20: placing a shield machine in one of the working wells, and using the shield machine to excavate the platform layer tunnel by the mechanical method, completing the excavation of the platform layer tunnel, and when the shield machine is placed in the other working well, the shield machine is lifted out of the working well;

[0016] S30: applying full-concrete pipe segments to the standard section of the platform layer tunnel, and applying detachable steel pipe segments to the connection of the corresponding inclined passageway;

[0017] S40: using the jacking technology to jack three rows of small-pitch pipes at the station hall position, the three small-pitch pipes in each row serving as a ring of pipes, the small-pitch pipes being detachable rectangular pipes, the vertical pipe segments and the horizontal pipe segments of the small-pitch pipes being detachably connected by connecting pieces, and the vertical pipe segments of the adjacent small-pitch pipes abutting to form temporary pipe segments;

[0018] S50: applying temporary vertical steel support frames to the small-pitch pipes, then removing the temporary pipe segments, applying beam-column systems to the positions of the temporary pipe segments between the adjacent small-pitch pipes to perform stress conversion, simultaneously applying tensioned prestressed steel bars to the top and bottom between the adjacent small-pitch pipes, and removing the temporary vertical steel support frames after forming permanent beams and columns between the adjacent small-pitch pipes;

[0019] S60: after forming the overall structural system of the platform layer and the station hall layer, applying an inclined passageway between the platform layer and the station hall layer.

[0020] Further, in the S50, when the beam-column system is constructed and the prestressed steel is applied on the top and bottom between the adjacent small-pitch jacking pipes, the following method is adopted: the four rings of the jacking pipe are taken as one section by using the skip method, in the first section, the temporary pipe piece is removed, then the beam-column system is constructed on the position of the temporary pipe piece between the adjacent small-pitch jacking pipes to transfer the force, and the prestressed steel is applied on the top and bottom between the adjacent small-pitch jacking pipes, after the permanent beam-column is formed between the adjacent small-pitch jacking pipes, the temporary vertical steel support is removed, then the construction operation of the next section is carried out, until the construction of the permanent beam-column in each section and the removal of the temporary vertical steel support are completed.

[0021] Further, in the S40, the connecting piece adopts the following structure: the connecting piece comprises two C-shaped steel joints, the C-shaped steel joints are provided with a main reinforcement, and the end faces of the C-shaped steel joints away from the main reinforcement are provided with through holes, one of the C-shaped steel joints is embedded on the transverse pipe piece through the main reinforcement, and the other C-shaped steel joint is embedded on the end of the vertical pipe piece through the main reinforcement, the two C-shaped steel joints abut against each other and the C-shaped openings of the two C-shaped steel joints are both directed to the small-pitch jacking pipe, and the through holes of the two C-shaped steel joints are opposite to each other and connected through a bolt joint.

[0022] Further, in the S50, in the process of constructing the beam-column system and applying the prestressed steel on the top and bottom between the adjacent small-pitch jacking pipes, the following method is adopted: the beam-column is cast in situ on the position of the temporary pipe piece between the adjacent small-pitch jacking pipes, and the prestressed beam channel is reserved in the cast-in-situ beam-column, so as to facilitate the subsequent tensioning of the prestressed steel through the prestressed beam channel, thereby forming the permanent beam-column between the adjacent small-pitch jacking pipes.

[0023] Further, in the S50, after the temporary vertical steel support frame is removed, the floor cast-in-place layer is constructed in the small-pitch jacking pipes in each section.

[0024] Further, in the S30, the structures of the full-concrete pipe piece and the detachable steel pipe piece are as follows: the arc-shaped two ends of the full-concrete pipe piece are 40 degrees about the center, the adjacent full-concrete pipe pieces are connected through concrete casting, the arc-shaped two ends of the detachable steel pipe piece are 5 degrees about the center, the arc-shaped two ends of the detachable steel pipe piece are respectively provided with a detent and a sliding groove, the detent and the sliding groove are slidingly matched, the adjacent detachable steel pipe pieces are slidingly matched through the detents and the sliding grooves, and the full-concrete pipe piece and the detachable steel pipe piece are connected through an anchoring piece.

[0025] Further, in the S40, when the three columns of small-pitch jacking pipes are jacked in parallel at the station hall position by using the jacking technology, the following method is adopted: the small-pitch jacking pipes in the middle column are jacked first, then the small-pitch jacking pipes in the other two columns are jacked respectively, and the three columns of small-pitch jacking pipes are arranged in parallel.

[0026] Further, in the S60, when the inclined passageway is constructed between the platform layer and the station hall layer, the detachable steel pipe piece corresponding to the inclined passageway in the platform layer tunnel can be removed, and the transverse pipe piece corresponding to the inclined passageway in the small-pitch pipe jacking in the station hall layer can be removed.

[0027] The present application has the following beneficial effects:

[0028] 1. The small-pitch pipe jacking in the present application adopts detachable pipe jacking, and the pipe pieces (i.e. vertical pipe pieces and transverse pipe pieces) of the small-pitch pipe jacking are detachably connected through connecting pieces, and the pipe pieces of the small-pitch pipe jacking are light in weight, convenient for transportation and hoisting. Meanwhile, after the pipe pieces become detachable components, various size requirements can be used, and changes can be made according to specific project requirements.

[0029] 2. The present application arranges the longitudinal prestressing tendons of the top and bottom longitudinal beams to form a whole in the longitudinal direction.

[0030] 3. The combined station construction technology of the present application adopts the combination of mechanical method and detachable pipe jacking method, and various geological conditions can be used. For the station hall layer (negative one layer, shallow), which is generally in artificial fill, clay layer, the pipe jacking method is adopted; for the platform layer (negative two layer, walking car), which is generally in rock layer, the mechanical method is adopted.

[0031] 4. When the combined station construction technology of the present application adopts the combination of mechanical method and detachable pipe jacking method, the station depth is flexible, and when there are dense buildings in front and back of the station, the station hall layer (negative one layer) can be shallowly buried, and the platform layer (negative two layer) can be deeply buried to avoid the foundation of the buildings in front and back of the station.

[0032] 5. The combined method station of the present application connects the station hall layer and the platform layer by the mechanical method tunnel, and connects the three parts into a whole station.

[0033] 6. The combined method of the present application uses prestressing tendons to tie each pipe piece into a whole, and the whole is better in integrity. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a schematic diagram of the underground station structure of the prior art whole frame.

[0035] Figure 2 It is a longitudinal section view of the method of the present application.

[0036] Figure 3 It is a transverse section view of the method of the present application.

[0037] Figure 4 It is a schematic diagram of the standard section of the platform layer tunnel of the present application.

[0038] Figure 5 A schematic view of a standard section of a platform level tunnel intersecting with a ramp section.

[0039] Figure 6 A cross-sectional view of a small-pitch pipe section of the present application.

[0040] Figure 7 A structural schematic view of a connecting piece of the present application.

[0041] Figure 8 A schematic view of a girder prestressing beam of a small-pitch pipe of the present application.

[0042] Figure 9 A schematic view of a connection between a ramp and a platform level pipe passage of the present application.

[0043] In the figure: 1, working well; 2, platform level tunnel; 3, full concrete pipe piece; 4, detachable steel pipe piece; 5, small-pitch pipe; 51, transverse pipe piece; 52, vertical pipe piece; 6, connecting piece; 61, C-shaped steel joint; 62, main reinforcement; 63, bolt joint; 7, permanent beam column; 8, temporary vertical steel support frame; 9, bottom plate cast-in-place layer; 10, ramp. DETAILED DESCRIPTION

[0044] The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The terms such as "upper", "inner", "middle", "left", "right", and "one" used in the specification are only for the convenience of clear description, and are not intended to limit the scope of the application. Changes or adjustments of the relative relationship without substantial changes in technical content are also considered as the scope of the application.

[0045] The present application is aimed at the construction method of the existing underground station using the whole pipe jacking. In order to overcome the problems of large difficulty in whole pipe jacking, large difficulty in whole deep excavation, large difficulty in implementation of artificial fill soft clay bottom layer at a relatively deep position, and poor integrity, a composite station construction method based on mechanical method and detachable small-pitch parallel pipe jacking method is provided. The composite station construction method of the present application will be described in detail as follows:

[0046] A composite station construction method based on mechanical method and detachable small-pitch parallel pipe jacking method, as shown in Figures 2 to 9 includes the following steps:

[0047] S10: Excavate working wells 1 at both ends of the subway station construction position, and take the working wells 1 as part of the main structure of the subway station.

[0048] S20: Put the shield machine into one of the working wells 1, use the shield machine to mechanically excavate the platform layer tunnel 2, complete the excavation of the platform layer tunnel 2, and the shield machine is lifted out of the working well 1 when the shield machine is located in the other working well 1.

[0049] S30: The full concrete pipe piece 3 of the mechanical pipe piece standard section of the platform layer tunnel 2, wherein the connecting part corresponding to the inclined passage 10 is made of a detachable steel pipe piece 4.

[0050] In S30, regarding the structure of the full concrete pipe piece 3 and the detachable steel pipe piece 4: the arc-shaped two ends of the full concrete pipe piece 3 are 40 degrees about the center, the adjacent full concrete pipe pieces 3 are connected by concrete pouring, the arc-shaped two ends of the detachable steel pipe piece 4 are 5 degrees about the center, the arc-shaped two ends of the detachable steel pipe piece 4 are respectively provided with a clamping position and a sliding groove, the clamping position and the sliding groove are slidingly matched, the adjacent detachable steel pipe pieces 4 are slidingly matched through the clamping position and the sliding groove, and the full concrete and the detachable steel pipe piece 4 are connected by an anchor. When the detachable steel pipe piece 4 is removed, the detachable steel pipe piece 4 can be removed by pulling it outwards, which has the advantage of simple disassembly operation.

[0051] S40: Three rows of small-pitch jacking pipes 5 are jacked in the station hall layer position using the jacking technology, and the three small-pitch jacking pipes 5 in each row are used as a ring of jacking pipes. The small-pitch jacking pipe 5 is a detachable jacking pipe with a rectangular cross-section, that is, the small-pitch jacking pipe 5 is detachably spliced by two horizontal pipe pieces 51 and two vertical pipe pieces 52, wherein the vertical pipe pieces 52 and the horizontal pipe pieces 51 of the small-pitch jacking pipe 5 are detachably connected by a connecting piece 6, and the abutting vertical pipe pieces 52 between adjacent small-pitch jacking pipes 5 form temporary pipe pieces.

[0052] In S40, when the three rows of small-pitch jacking pipes 5 are jacked in the station hall layer position using the jacking technology, the following method is usually used: first, jack in the small-pitch jacking pipes 5 in the middle row, and then jack in the small-pitch jacking pipes 5 in the left and right rows in turn, and arrange the three rows of small-pitch jacking pipes 5 side by side. The method of first jacking in the small-pitch jacking pipes 5 in the middle row and then jacking in the small-pitch jacking pipes 5 in the left and right rows can improve the effectiveness of the implementation process, and the operation of first jacking in the small-pitch jacking pipes 5 in the middle position is the most convenient, and can provide positioning for the jacking positions of the two rows of small-pitch jacking pipes 5, thus having the advantages of simple and efficient implementation operation.

[0053] In S40, regarding the detachable structure of the small-pitch pipe jacking 5, in which detachable connection between the vertical pipe piece 52 and the horizontal pipe piece 51 is mainly realized through the connecting piece 6, regarding the structure of the connecting piece 6: the connecting piece 6 comprises two C-shaped steel joints 61, the C-shaped steel joint 61 is provided with a main reinforcement 62, a through hole is opened in the end face of the C-shaped steel joint 61 away from the main reinforcement 62, one C-shaped steel joint 61 is embedded on the horizontal pipe piece 51 through the main reinforcement 62, and the other C-shaped steel joint 61 is embedded at the end of the vertical pipe piece 52 through the main reinforcement 62, the two C-shaped steel joints 61 abut and the C-shaped openings of the two C-shaped steel joints 61 are both directed towards the inside of the small-pitch pipe jacking 5, and the through holes of the two C-shaped steel joints 61 are opposite to each other and connected through a bolt joint 63. Therefore, when the temporary pipe piece is detached, the bolt joint 63 can be directly screwed out of the C-shaped opening of the C-shaped steel joint 61, that is, the detachment can be realized, and the operation is simple. It should be noted that the number of connecting pieces 6 in the embodiment is two, and they are arranged on the opposite sides of the connecting position to improve the stability of the stress and bearing capacity.

[0054] S50: temporary vertical steel support frames 8 are constructed in the small-pitch pipe jacking 5. Then, every four rings of the pipe jacking is taken as a section, and one end of one section is taken as the first section and the other end of one section is taken as the last section; then, the sections are constructed one by one in the way of the jump warehouse method. In the first section, the temporary pipe piece is removed, and then a beam-column system is constructed at the position of the temporary pipe piece between the adjacent small-pitch pipe jackings 5 for stress transfer, and prestressed steel bars are arranged at the top and bottom between the adjacent small-pitch pipe jackings 5. After the permanent beam-column 7 is formed between the adjacent small-pitch pipe jackings 5, the temporary vertical steel support is removed. Then, the next section is entered for construction until the construction of the permanent beam-column 7 in each section and the removal of the temporary vertical steel support are completed. At the same time, after the temporary vertical steel support frame 8 is removed, a bottom cast-in-place layer 9 is constructed in the small-pitch pipe jackings 5 in each section to improve the integrity and stability between the adjacent small-pitch pipe jackings 5.

[0055] In S50, in the process of constructing the beam-column system and prestressed steel bars at the top and bottom between the adjacent small-pitch pipe jackings 5, the following method is adopted: cast-in-place beam-column is constructed at the position of the temporary pipe piece between the adjacent small-pitch pipe jackings 5, and a prestressed beam channel is reserved in the cast-in-place beam-column to facilitate subsequent tensioning of the prestressed steel bars through the prestressed beam channel, thereby forming a permanent beam-column 7 between the adjacent small-pitch pipe jackings 5 and improving the integrity, stability and compressive strength between the adjacent small-pitch pipe jackings 5.

[0056] S60: After the overall structural system is formed on the platform layer and the station hall layer, the inclined passageway 10 is constructed between the platform layer and the station hall layer. In this process, when the inclined passageway 10 is constructed between the platform layer and the station hall layer, the detachable steel pipe piece 4 corresponding to the inclined passageway 10 in the platform layer tunnel 2 can be removed when the inclined passageway 10 accesses the platform layer and the station hall layer, and at the same time, the transverse pipe piece 51 corresponding to the inclined passageway 10 in the small-pitch jacking pipe 5 in the station hall layer can be removed. Therefore, the detachable steel pipe piece 4 and the detachable small-pitch jacking pipe 5 have the advantages of being easy to disassemble and suitable for passageway connection.

[0057] The composite station construction method based on the mechanical method and the detachable small-pitch parallel jacking pipe method of the present application sets the working well 1 to lower and hoist the shield machine by using the working well 1, and at the same time, excavates the platform layer tunnel 2 by using the shield machine, thereby facilitating the construction of the full-concrete pipe piece 3 on the standard section of the platform layer tunnel 2 and the detachable steel pipe piece 4 at the connection position corresponding to the inclined passageway 10, and facilitating the subsequent disassembly operation. Further, the three-row small-pitch jacking pipes 5 are jacked in by using the jacking method, wherein the small-pitch jacking pipes 5 are detachable jacking pipes with a rectangular cross section, thereby facilitating the subsequent overall reinforcement. Then, the temporary vertical steel support frame 8 is constructed in the small-pitch jacking pipe 5, and then the temporary pipe piece is removed. After the permanent beam column 7 is constructed between the adjacent small-pitch jacking pipes 5, the temporary vertical steel support frame 8 is removed. Finally, the inclined passageway 10 is constructed between the platform layer and the station hall layer. Based on this, compared with the construction method of the overall underground station of the prior art, the construction of the platform layer (deeper layer, used for vehicle driving) tunnel of the present application adopts the working well 1 combined with the shield machine excavation method (mechanical method construction), which can overcome the difficulty of difficult excavation of deep rock layers and has the advantage of efficient and convenient construction operation compared with the jacking method. The station hall layer (shallow layer) is generally in the artificial fill, clay layer, and the jacking method is used to jacking the three-row small-pitch jacking pipes 5, and then the permanent beam column 7 is further arranged in the small-pitch jacking pipe 5, and finally the inclined passageway 10 is constructed between the platform layer and the station hall layer, thereby having the advantages of high construction efficiency, high overall structural stability, and convenient construction.

[0058] In summary, the composite station construction method based on the mechanical method and the detachable small-pitch parallel jacking pipe method of the present application has the following advantages:

[0059] 1. The small-pitch jacking pipe 5 of the present application adopts a detachable jacking pipe, and the pipe pieces (i.e., vertical pipe pieces 52 and transverse pipe pieces 51) of the small-pitch jacking pipe 5 are detachably connected by the connecting piece 6, and the pipe pieces of the small-pitch jacking pipe 5 are light in weight, easy to transport, and convenient to hoist. At the same time, after the pipe pieces become detachable components, various size requirements can be used, and changes can be made according to specific project requirements.

[0060] 2. The longitudinal pre-stressed beam of the top and bottom longitudinal beams is arranged to form a whole in the joint longitudinally.

[0061] 3. The combined station construction technology of the present application adopts the combination of mechanical method and detachable pipe-jacking method, and can be used in various geological conditions. For the station hall layer (negative one layer, shallow), which is generally located in artificial fill and clay layer, the pipe-jacking method is adopted; for the station platform layer (negative two layer, vehicle running layer), which is generally located in rock layer, the mechanical method is adopted.

[0062] 4. When the combined station construction technology of the present application adopts the combination of mechanical method and detachable pipe-jacking method, the station depth is flexible. When there are dense buildings in front and back of the station, the station hall layer (negative one layer) can be shallowly buried, and the station platform layer (negative two layer) can be deeply buried to avoid the foundation of the buildings in front and back of the station.

[0063] 5. The combined station construction technology of the present application connects the three parts into a whole station by the mechanical method tunnel between the station hall layer and the station platform layer.

[0064] 6. The combined station construction technology of the present application uses prestressed beam to connect each pipe segment into a whole, and the whole has better integrity.

[0065] The embodiments of the present application are not limited to the above, and according to the above content of the present application, using the ordinary technical knowledge and common means in the art, other various forms of modification, replacement or combination can be made without departing from the above basic technical idea of the present application, and all fall within the protection scope of the present application.

Claims

1. A composite station construction method based on mechanical methods and detachable small-clearance parallel pipe jacking methods, characterized in that, Includes the following steps: S10: Excavate working shafts at both ends of the subway station construction site, and incorporate the working shafts as part of the main structure of the subway station; S20: Place the tunnel boring machine (TBM) in one of its working shafts, use the TBM to mechanically excavate the platform level tunnel, and complete the platform level tunnel excavation. When the TBM is placed in another working shaft, the TBM is lifted out of the working shaft. S30: The standard section of the mechanical segment in the platform tunnel is made of concrete segments, while the connection of the corresponding inclined passage is made of detachable steel segments. S40: Using the jacking technology, three rows of small-clear-space jacking pipes are jacked in parallel at the station hall level. The three small-clear-space jacking pipes in each row form a ring jacking pipe. The small-clear-space jacking pipes are detachable jacking pipes with rectangular cross-sections. The vertical and horizontal segments of the small-clear-space jacking pipes are detachably connected by connectors. The vertical segments that abut between adjacent small-clear-space jacking pipes form temporary segments. S50: A temporary vertical steel support frame is constructed inside the small-clearance jacking pipe, and then the temporary pipe segments are removed. A beam-column system is constructed at the location of the temporary pipe segments between adjacent small-clearance jacking pipes to transfer the stress. At the same time, tensioned prestressed steel bars are constructed at the top and bottom between adjacent small-clearance jacking pipes. After permanent beams and columns are formed between adjacent small-clearance jacking pipes, the temporary vertical steel support frame is removed. S60: After the platform level and concourse level form an integrated structural system, an inclined passageway is constructed between the platform level and the concourse level.

2. The composite station construction method based on mechanical method and detachable small-clearance parallel pipe jacking method as described in claim 1, characterized in that, In S50, when constructing the beam-column system and tensioning prestressed steel bars after removing the temporary tunnel lining segments, the following methods need to be adopted: The skip-section method is used to divide each four-ring jacking pipe into sections. In the first section, the temporary pipe segments are removed, and then a beam-column system is constructed at the location of the temporary pipe segments between adjacent small-clear-space jacking pipes to transfer the stress. At the same time, tensioned prestressed steel bars are installed at the top and bottom between adjacent small-clear-space jacking pipes. After the permanent beams and columns are formed between adjacent small-clear-space jacking pipes, the temporary vertical steel supports are removed, and then the construction operation of the next section is carried out until the construction of the permanent beams and columns and the removal of the temporary vertical steel supports in each section are completed.

3. The composite station construction method based on mechanical method and detachable small-clearance parallel pipe jacking method as described in claim 1, characterized in that, In S40, the connector has the following structure: The connector includes two C-shaped steel joints, each with a main rib. A through hole is formed on the end face of the C-shaped steel joint away from the main rib. One C-shaped steel joint is embedded in the transverse segment via the main rib, and the other C-shaped steel joint is embedded in the end of the vertical segment via the main rib. The two C-shaped steel joints abut against each other, with their C-shaped openings facing into the jacking pipe with the small clearance. The through holes of the two C-shaped steel joints are directly opposite each other, and the two directly opposite through holes are connected by bolts.

4. The composite station construction method based on mechanical method and detachable small-clearance parallel pipe jacking method as described in claim 1, characterized in that, In S50, during the construction of the beam-column system, and simultaneously during the installation of tensioned prestressed steel bars at the top and bottom between adjacent small-clear-distance jacking pipes, the following method is adopted: Beams and columns are cast in place at the temporary duct segments between adjacent small-clear-distance jacking pipes. Prestressed tendon channels are reserved in the cast-in-place beams and columns to facilitate the subsequent tensioning of prestressed steel bars through the prestressed tendon channels, thereby forming permanent beams and columns between adjacent small-clear-distance jacking pipes.

5. The composite station construction method based on mechanical method and detachable small-clearance parallel pipe jacking method as described in claim 2, characterized in that, In S50, after the temporary vertical steel support frame is removed, the bottom slab is cast in place within the multiple small-clear-space jacking pipes of each section.

6. The composite station construction method based on mechanical method and detachable small-clearance parallel pipe jacking method as described in claim 1, characterized in that, In S30, the structure used for the all-concrete segments and the detachable steel segments is as follows: The two ends of the all-concrete pipe segment are at a 40-degree angle about the center. Adjacent all-concrete pipe segments are connected by concrete pouring. The two ends of the detachable steel pipe segment are at a 5-degree angle about the center. The two ends of the detachable steel pipe segment are respectively provided with locking positions and sliding grooves. The locking positions and sliding grooves are slidably adapted to each other. Adjacent detachable steel pipe segments are slidably adapted to each other through locking positions and sliding grooves. The all-concrete and detachable steel pipe segments are connected by anchors.

7. The composite station construction method based on mechanical method and detachable small-clearance parallel pipe jacking method as described in claim 1, characterized in that, In S40, when using the jacking technology to jack three rows of small-clear-space jacking pipes side by side at the station hall level, the following method is adopted: first jack the middle row of small-clear-space jacking pipes, and then jack the other two rows of small-clear-space jacking pipes respectively, so that the three rows of small-clear-space jacking pipes are arranged side by side.

8. The composite station construction method based on mechanical method and detachable small-clearance parallel pipe jacking method as described in claim 1, characterized in that, In S60, when constructing an inclined tunnel between the platform level and the concourse level, when the inclined tunnel connects to the platform level and the concourse level, the detachable steel pipe segments corresponding to the inclined tunnel in the platform level tunnel are removed, and at the same time, the transverse pipe segments corresponding to the inclined tunnel in the concourse level with small clearance jacking are removed.

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