Composite station construction method based on mechanical method and detachable small-clear-distance parallel pipe jacking method

Abstract

The invention discloses a composite station construction method based on a mechanical method and a detachable small-clear-distance parallel pipe jacking method, which comprises the following steps of: arranging a working well, lowering and lifting a shield tunneling machine by using the working well, and excavating a platform layer tunnel by using the shield tunneling machine, so that full-concrete pipe pieces can be conveniently constructed on a standard section of the platform layer tunnel; detachable steel pipe pieces are arranged at the joints of the corresponding inclined channels, so that subsequent disassembly operation is facilitated; furthermore, three rows of small-clear-distance jacking pipes which are arranged side by side are jacked in a jacking mode, and the small-clear-distance jacking pipes are detachable jacking pipes with rectangular sections, so that subsequent integral reinforcement is facilitated; temporary vertical steel supporting frames are constructed in the small-clear-distance jacking pipes, then temporary pipe pieces are dismantled, and after permanent beam columns are constructed between the adjacent small-clear-distance jacking pipes, the temporary vertical steel supporting frames are dismantled; and finally, an inclined channel is constructed between the platform layer and the station hall layer. By the adoption of the method, the problems that an existing subway station is large in overall pushing difficulty and overall deep digging difficulty, large in implementation difficulty in bottom layers such as manual filling of soft soil clay and poor in integrity can be solved, and the method has the advantages of being efficient and convenient to construct.

Description

Technical Field

[0001] The invention belongs to the technical field of subway station construction technology, and specifically relates to a composite station construction method based on a mechanical method and a detachable small-clearance parallel jacking method. Background Art

[0002] In traditional technology, when constructing underground stations, traditional open-cut construction method and traditional dark-cut construction method are usually used:

[0003] 1) When the traditional open-cut method is used, the site required for the construction of underground stations is relatively large, and the plane size of a standard station is generally 250 meters * 20 to 25 meters. With the increasing perfection of urbanization, the volume of basements and pile foundations of buildings is increasing, and there are many cases in the city center where there is no condition to use the open-cut method to construct the main structure of the station; at the same time, when the traditional open-cut method is used, the preliminary projects such as demolition and pipeline relocation must be completed before the next stage of construction can be carried out.

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

[0005] Based on this, the existing patent CN107559026A proposes a rectangular overall frame underground station structure (such as Figure 1 As shown in the figure, this frame structure usually adopts the construction method of integral jacking pipe. The problems existing in the integral jacking pipe scheme are as follows:

[0006] 1. Since the end size of a subway station is generally about 15m*20m, if the integral type is used, two rings of 15m*15m space will be required. The requirements for the jacking of the pipe are high and difficult, and it is difficult to verify the requirements of the existing pipe jacking machine. At the same time, there are many difficulties in the weight and size of the integral pipe segment, transportation (three-dimensional construction is difficult to transport), and hoisting.

[0007] 2. The integral frame structure can only be implemented in double-deck standard stations, and the foundation depth of buildings in the city center is relatively large. If the subway station is two-story underground, the depth of the arch between the front and rear sections is about 10 meters, and the station must be located in an open area around it.

[0008] 3. The conditions for implementing pipe jacking are very limited. It can only be implemented in artificial fill, soft soil, clay and other strata. It cannot be implemented if the station construction area is in rock strata.

[0009] 4. The station in the patent is divided into sections of 2 meters each and does not form a whole in the longitudinal direction, so the integrity is poor.

[0010] Therefore, there is still room for improvement in the existing underground station construction method. Summary of the invention

[0011] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a composite station construction method based on a mechanical method and a detachable small-clearance parallel jacking method, which can overcome the problems of the existing subway station's overall jacking difficulty, overall deep excavation difficulty, difficulty in implementation on the bottom layer of artificial fill soft soil clay, and poor integrity.

[0012] The purpose of the present invention is achieved through the following technical solutions:

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

[0014] S10: Open-cut working pits are constructed at both ends of the subway station construction site and the working pits are used as part of the main structure of the subway station;

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

[0016] S30: Full concrete segments at standard mechanical segment sections of platform-level tunnels, with removable steel segments at the corresponding inclined channel joints;

[0017] S40: The jacking technology is used to jack three rows of small-clearance jacking pipes in parallel at the station hall level. The three small-clearance jacking pipes in each row serve as a ring jacking pipe. The small-clearance jacking pipes are detachable jacking pipes with a rectangular cross-section. The vertical and horizontal segments of the small-clearance jacking pipes are detachably connected through connectors. The vertical segments that abut against each other between adjacent small-clearance jacking pipes form temporary segments.

[0018] S50: A temporary vertical steel support frame is constructed inside the small clear distance jacking pipe, and then the temporary pipe segments are removed. A beam-column system is constructed at the temporary pipe segment positions between adjacent small clear distance jacking pipes for force conversion. At the same time, prestressed steel bars are tensioned at the top and bottom between adjacent small clear distance jacking pipes. After permanent beams and columns are formed between adjacent small clear distance jacking pipes, the temporary vertical steel support frame is removed.

[0019] S60: After the platform and concourse layers form an overall structural system, an inclined passage is constructed between the platform and concourse layers.

[0020] Furthermore, in S50, when constructing the beam-column system and tensioning prestressed steel bars after removing the temporary pipe segments, the following method needs to be adopted: adopt the skipping method to regard each four-ring jacking pipe as a section. In the first section, remove the temporary pipe segments, and then construct the beam-column system at the temporary pipe segment position between adjacent small-clearance jacking pipes to perform force conversion. At the same time, tensioned prestressed steel bars are applied 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 supports are removed, and then the construction operation of the next section is entered until the construction of permanent beams and columns and the removal of temporary vertical steel supports in each section are completed.

[0021] Furthermore, in S40, the connecting piece adopts the following structure: the connecting piece includes two C-shaped steel joints, the C-shaped steel joints are provided with main reinforcements, and the end faces of the C-shaped steel joints away from the main reinforcements are provided with through holes, one of the C-shaped steel joints is embedded in the horizontal pipe segment through the main reinforcement, and the other C-shaped steel joint is embedded in the end of the vertical pipe segment through the main reinforcement, the two C-shaped steel joints are abutted against each other and the C-shaped openings are both facing the small clear distance top pipe, and the through holes of the two C-shaped steel joints are opposite to each other, and the two opposite through holes are connected by bolt joints.

[0022] Furthermore, in the S50, during the construction of the beam-column system and the tensioning of prestressed steel bars at the top and bottom between adjacent small-clearance jacking pipes, the following method is adopted: beams and columns are cast in situ at the temporary pipe segment positions between adjacent small-clearance jacking pipes, and prestressed beam channels are reserved in the cast-in-situ columns and beams, thereby facilitating the subsequent tensioning of prestressed steel bars through the prestressed beam channels, thereby forming permanent beams and columns between adjacent small-clearance jacking pipes.

[0023] Furthermore, in the S50, after the temporary vertical steel support frame is removed, a bottom plate cast-in-place layer is constructed in a plurality of top pipes with small clearances in each section.

[0024] Furthermore, in S30, the structures adopted by the full concrete segments and the detachable steel segments are as follows: the arc-shaped ends of the full concrete segments are at an angle of 40 degrees to the center of the circle, and the adjacent full concrete segments are connected by pouring concrete; the arc-shaped ends of the detachable steel segments are at an angle of 5 degrees to the center of the circle, and the arc-shaped ends of the detachable steel segments are respectively provided with a clamping position and a sliding groove, the clamping position is slidably fitted with the sliding groove, and the adjacent detachable steel segments are slidably fitted with the clamping position and the sliding groove, and the full concrete and detachable steel segments are connected by anchors.

[0025] Furthermore, in S40, when the jacking technology is used to jack three rows of small-clearance jacking pipes side by side at the station hall level, the following method is adopted: first jack the small-clearance jacking pipes in the middle row, and then jack the other two rows of small-clearance jacking pipes respectively, and the three rows of small-clearance jacking pipes are arranged side by side.

[0026] Furthermore, in the S60, when an inclined passage is constructed between the platform layer and the station hall layer, when the inclined passage is connected to the platform layer and the station hall layer, the detachable steel pipe segments corresponding to the inclined passage in the platform layer tunnel can be removed, and at the same time, the transverse pipe segments corresponding to the inclined passage of the small clear distance jacking pipe in the station hall layer can be removed.

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

[0028] 1. The small clearance jacking pipe of the present invention adopts a detachable jacking pipe, and the pipe segments (i.e., vertical pipe segments and horizontal pipe segments) of the small clearance jacking pipe are detachably connected through connectors, and the pipe segments of the small clearance jacking pipe are light in weight, easy to transport and convenient to hoist. At the same time, after the pipe segments become detachable components, various size requirements can be used, and they can be changed according to specific project requirements.

[0029] 2. The present invention arranges the longitudinal prestressed beams of the top and bottom longitudinal beams so that the joint forms a whole in the longitudinal direction.

[0030] 3. The present invention adopts a combination of mechanical method and detachable jacking method to build a station, which can be used in various geological conditions. For the station hall layer (the first underground floor, shallow), which is generally in artificial fill and clay layer, the jacking method is adopted; for the platform layer (the second underground floor, where the trains run), which is generally in rock layer, the mechanical method is adopted.

[0031] 4. When the present invention adopts a combination of mechanical method and detachable jacking pipe method to build a station, the station burial depth is flexible. When there are dense buildings before and after the station, the station hall layer (first underground floor) can be shallowly buried and the platform layer (second underground floor) can be deeply buried to avoid the foundations of the buildings before and after the station.

[0032] 5. The combined construction method of the present invention adopts a mechanical tunnel to connect the station hall layer and the platform layer, connecting the three parts into a whole station.

[0033] 6. The combined construction method of the present invention adopts prestressed bundles to tie the segments longitudinally to form a whole, thereby improving the integrity. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The schematic diagram of the underground station structure is the overall framework of the prior art.

[0035] Figure 2 It is a longitudinal sectional view of the working method of the present invention.

[0036] Figure 3 It is a cross-sectional view of the working method of the present invention.

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

[0038] Figure 5 It is a schematic diagram of the intersection section of the standard section and the inclined channel of the platform level tunnel of the present invention.

[0039] Figure 6 It is a cross-sectional view of the small clearance top pipe part of the present invention.

[0040] Figure 7 It is a schematic structural diagram of the connecting piece of the present invention.

[0041] Figure 8 It is a schematic diagram of the prestressed bundle of the longitudinal beam of the small clear distance jacking pipe of the present invention.

[0042] Fig. 9 It is a schematic diagram of the connection between the inclined passage of the present invention and the top pipe passage of the station hall layer.

[0043] In the figure: 1. Working shaft; 2. Platform level tunnel; 3. Full concrete segments; 4. Removable steel segments; 5. Small clearance jacking pipe; 51. Horizontal segments; 52. Vertical segments; 6. Connectors; 61. C-shaped steel joints; 62. Main reinforcement; 63. Bolt joints; 7. Permanent beams and columns; 8. Temporary vertical steel support frames; 9. Cast-in-place bottom slab; 10. Inclined passage. DETAILED DESCRIPTION

[0044] The present invention is 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" cited in this specification are only for the convenience of description, and are not used to limit the scope of the present invention. The change or adjustment of their relative relationship shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0045] The present invention aims at the existing underground station construction method using an integral jacking pipe. In order to overcome the problems of the subway station (also called underground station) being difficult to push as a whole, difficult to dig deep as a whole, difficult to implement in the bottom layer such as artificial filling of soft soil and clay at a deeper position, and poor integrity, a composite station construction method based on a mechanical method and a detachable small clearance parallel jacking pipe method is provided. The composite station construction method of the present invention is described in detail below:

[0046] A composite station construction method based on mechanical method and detachable small clearance parallel jacking method, such as Figures 2 to 9 As shown, the following steps are included:

[0047] S10: Open-dig a working shaft 1 at both ends of the subway station construction location, and use the working shaft 1 as a part of the main structure of the subway station.

[0048] S20: placing a shield machine in one of the working shafts 1, using the shield machine to excavate the platform layer tunnel 2 by mechanical method, and when the excavation of the platform layer tunnel 2 is completed and the shield machine is located in another working shaft 1, the shield machine is hoisted out of the working shaft 1.

[0049] S30: In the standard section of the mechanical segment of the platform-level tunnel 2, the full concrete segment 3 is constructed, and the connection corresponding to the inclined channel 10 is constructed with a detachable steel segment 4.

[0050] In S30, regarding the structure of the full concrete segment 3 and the detachable steel segment 4: the arc ends of the full concrete segment 3 form a 40-degree angle with respect to the center of the circle, and the adjacent full concrete segments 3 are connected by concrete pouring, the arc ends of the detachable steel segment 4 form a 5-degree angle with respect to the center of the circle, and the arc ends of the detachable steel segment 4 are respectively provided with a clamping position and a slide groove, the clamping position and the slide groove are slidably adapted, and the adjacent detachable steel segments 4 are slidably adapted by the clamping position and the slide groove, and the full concrete and the detachable steel segment 4 are connected by anchors. Among them, when removing the detachable steel segment 4, the disassembly operation can be achieved by pulling the detachable steel segment 4 outward, which has the advantage of simple disassembly operation.

[0051] S40: The jacking technology is used to jack three rows of small-clearance jacking pipes 5 arranged side by side at the station hall level. The three small-clearance jacking pipes 5 in each row serve as a ring jacking pipe. The small-clearance jacking pipes 5 are detachable jacking pipes with a rectangular cross-section, that is, the small-clearance jacking pipes 5 are detachably spliced ​​from two horizontal pipe segments 51 and two vertical pipe segments 52, wherein the vertical pipe segments 52 and the horizontal pipe segments 51 of the small-clearance jacking pipes 5 are detachably connected by connecting pieces 6, and the vertical pipe segments 52 that abut against each other between adjacent small-clearance jacking pipes 5 form temporary pipe segments.

[0052] In S40, when the jacking technology is used to jack three rows of small clearance jacking pipes 5 arranged side by side at the station hall level, the following method is usually used: first jack the small clearance jacking pipe 5 in the middle row, and then jack the small clearance jacking pipes 5 in the left and right rows in sequence, and the three rows of small clearance jacking pipes 5 are arranged side by side. The method of first jacking the small clearance jacking pipe 5 in the middle row and then jacking the small clearance jacking pipes 5 in the left and right rows can improve the effectiveness of the implementation process. Firstly, jacking a row of small clearance jacking pipes 5 in the middle position has the best operation convenience, and can provide positioning for the jacking position of two rows of small clearance jacking pipes 5, so it has the advantages of simple and efficient implementation operation.

[0053] In S40, regarding the detachable structure of the small clearance jacking pipe 5, the detachable connection between the vertical pipe segment 52 and the horizontal pipe segment 51 is mainly realized by the connecting member 6. Regarding the structure of the connecting member 6: the connecting member 6 includes two C-shaped steel joints 61, the C-shaped steel joints 61 are provided with main ribs 62, and the end surface of the C-shaped steel joints 61 away from the main ribs 62 is provided with through holes, one of the C-shaped steel joints 61 is embedded in the horizontal pipe segment 51 through the main ribs 62, and the other C-shaped steel joint 61 is embedded in the end of the vertical pipe segment 52 through the main ribs 62. The two C-shaped steel joints 61 are abutted and the C-shaped openings are both facing the small clearance jacking pipe 5, and the through holes of the two C-shaped steel joints 61 are opposite, and the two opposite through holes are connected by bolt joints 63. Therefore, when disassembling the temporary pipe segment, the bolt joints 63 can be directly unscrewed in the C-shaped opening of the C-shaped steel joint 61 to achieve disassembly, and it has the advantage of simple disassembly operation. It should be noted that, in the present embodiment, there are two connecting members 6, which are arranged on two opposite sides of the connecting position to improve the stability of force and load bearing.

[0054] S50: A temporary vertical steel support frame 8 is constructed in the small clearance top pipe 5. Then, the skipping method is used to treat each four-ring top pipe as a section, and a section at one end is used as the first section, and a section at the other end is used as the last section; then, the skipping method is used to construct the sections one by one. In the first section, the temporary pipe segments are removed, and then a beam-column system is constructed at the temporary pipe segment position between adjacent small clearance top pipes 5 for force conversion. At the same time, prestressed steel bars are tensioned at the top and bottom between adjacent small clearance top pipes 5. After permanent beams and columns 7 are formed between adjacent small clearance top pipes 5, the temporary vertical steel support is removed; then the construction operation of the next section is entered until the construction of permanent beams and columns 7 in each section and the removal of temporary vertical steel supports are completed. At the same time, after the temporary vertical steel support frame 8 is removed, a bottom plate cast-in-place layer 9 is constructed in multiple small clearance top pipes 5 in each section to improve the integrity and stability between adjacent small clearance top pipes 5.

[0055] In S50, during the construction of the beam-column system and the tensioning of prestressed steel bars at the top and bottom between adjacent small-clearance jacking pipes 5, the following method is adopted: beams and columns are cast in situ at the temporary pipe segment positions between adjacent small-clearance jacking pipes 5, and prestressed beam channels are reserved in the cast-in-situ columns and beams, thereby facilitating the subsequent tensioning of prestressed steel bars through the prestressed beam channels, thereby forming permanent beams and columns 7 between adjacent small-clearance jacking pipes 5, and improving the integrity, stability and compressive resistance between adjacent small-clearance jacking pipes 5.

[0056] S60: After the platform layer and the station hall layer form an overall structural system, an inclined passage 10 is constructed between the platform layer and the station hall layer. 10 Among them, when the inclined passage 10 is constructed between the platform layer and the station hall layer, when the inclined passage 10 is connected to the platform layer and the station hall layer, the detachable steel pipe segment 4 corresponding to the inclined passage 10 in the platform layer tunnel 2 can be removed, and at the same time, the transverse pipe segment 51 corresponding to the inclined passage 10 in the small clear distance jacking pipe 5 in the station hall layer can be removed. Therefore, the detachable steel pipe segment 4 and the detachable small clear distance jacking pipe 5 have the advantages of being easy to disassemble and suitable for channel connection.

[0057] The composite station construction method based on the mechanical method and the detachable small clearance parallel jacking method of the present invention sets up a working shaft 1 to use the working shaft 1 to lower and hang the shield machine, and at the same time uses the shield machine to excavate the platform layer tunnel 2, so as to facilitate the application of full concrete pipe segments 3 in the standard section of the platform layer tunnel 2, and apply detachable steel pipe segments 4 at the connection of the corresponding inclined channel 10, so as to facilitate the subsequent disassembly operation; further, three rows of small clearance jacking pipes 5 arranged side by side are pushed in by a jacking method, wherein the small clearance jacking pipes 5 are detachable jacking pipes with a rectangular cross-section, so as to facilitate the subsequent reinforcement of the integrity; then a temporary vertical steel support frame 8 is applied in the small clearance jacking pipe 5, and then the temporary pipe segments are removed, and then permanent beams and columns 7 are applied between adjacent small clearance jacking pipes 5, and then the A temporary vertical steel support frame 8; and finally, an inclined passage 10 is constructed between the platform layer and the station hall layer. 10 Based on this, compared with the construction method of the integral underground station in the prior art, the present invention adopts a working well 1 combined with a shield machine excavation method (mechanical construction) for the construction of the platform layer (deeper layer, used for running vehicles) tunnel, which can overcome the difficulty of excavating deep rock formations, and has the advantages of efficient and convenient construction operation compared to the jacking method; and for the station hall layer (shallower layer), which is generally in artificial fill and clay layers, the jacking method is adopted to jack three rows of small-clearance jacking pipes 5, and then permanent beams and columns 7 are further arranged in the small-clearance jacking pipes 5, and finally, an inclined passage 10 is constructed between the platform layer and the station hall layer, so it has the advantages of high construction efficiency, high overall structural stability, and easy construction.

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

[0059] 1. The small clearance jacking pipe 5 of the present invention is a detachable jacking pipe. The pipe segments of the small clearance jacking pipe 5 (i.e., the vertical pipe segment 52 and the horizontal pipe segment 51) are detachably connected through the connecting piece 6. The pipe segments of the small clearance jacking pipe 5 are light in weight, convenient for transportation and hoisting. At the same time, after the pipe segments become detachable components, various size requirements can be used and can be changed according to specific project requirements.

[0060] 2. The present invention arranges the longitudinal prestressed beams of the top and bottom longitudinal beams so that the joint forms a whole in the longitudinal direction.

[0061] 3. The present invention adopts a combination of mechanical method and detachable jacking method to build a station, which can be used in various geological conditions. For the station hall layer (the first underground floor, shallow), which is generally in artificial fill and clay layer, the jacking method is adopted; for the platform layer (the second underground floor, where the trains run), which is generally in rock layer, the mechanical method is adopted.

[0062] 4. When the present invention adopts a combination of mechanical method and detachable jacking pipe method to build a station, the station burial depth is flexible. When there are dense buildings before and after the station, the station hall layer (first underground floor) can be shallowly buried and the platform layer (second underground floor) can be deeply buried to avoid the foundations of the buildings before and after the station.

[0063] 5. The combined construction method of the present invention adopts a mechanical tunnel to connect the station hall layer and the platform layer, connecting the three parts into a whole station.

[0064] 6. The combined construction method of the present invention adopts prestressed bundles to tie the segments longitudinally to form a whole, thereby improving the integrity.

[0065] The implementation methods of the present invention are not limited to this. According to the above content of the present invention, using common technical knowledge and customary means in the field, without departing from the above basic technical ideas of the present invention, the present invention can also make other various forms of modification, replacement or combination, all of which fall within the scope of protection of the present invention.

Claims

1. A composite station construction method based on mechanical method and detachable small clearance parallel jacking method, characterized in that: The following steps are involved: S10: Open-cut working pits are constructed at both ends of the subway station construction site and the working pits are used as part of the main structure of the subway station; S20: placing a shield machine in one of the working shafts, using the shield machine to excavate the platform layer tunnel by mechanical method, completing the excavation of the platform layer tunnel, and when the shield machine is placed in another working shaft, the shield machine is hoisted out of the working shaft; S30: Full concrete segments at standard mechanical segment sections of platform-level tunnels, with removable steel segments at the corresponding inclined channel joints; S40: The jacking technology is used to jack three rows of small-clearance jacking pipes in parallel at the station hall level. The three small-clearance jacking pipes in each row serve as a ring jacking pipe. The small-clearance jacking pipes are detachable jacking pipes with a rectangular cross-section. The vertical and horizontal segments of the small-clearance jacking pipes are detachably connected through connectors. The vertical segments that abut against each other between adjacent small-clearance jacking pipes form temporary segments. S50: A temporary vertical steel support frame is constructed inside the small clear distance jacking pipe, and then the temporary pipe segments are removed. A beam-column system is constructed at the temporary pipe segment positions between adjacent small clear distance jacking pipes for force conversion. At the same time, prestressed steel bars are tensioned at the top and bottom between adjacent small clear distance jacking pipes. After permanent beams and columns are formed between adjacent small clear distance jacking pipes, the temporary vertical steel support frame is removed. S60: After the platform and concourse layers form an overall structural system, an inclined passage is constructed between the platform and concourse layers.

2. The composite station construction method based on the mechanical method and the detachable small clearance parallel jacking method as claimed in claim 1 is characterized in that: In S50, when constructing the beam-column system and the prestressed steel bars after removing the temporary pipe segments, the following methods need to be adopted: The skipping method is adopted to regard every four-ring jacking pipe as a section. In the first section, the temporary pipe segments are removed, and then a beam-column system is constructed at the temporary pipe segment position between adjacent small-clearance jacking pipes for force conversion. At the same time, prestressed steel bars are tensioned 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 supports are removed, and then the construction operation of the next section is started until the construction of permanent beams and columns and the removal of temporary vertical steel supports in each section are completed.

3. The composite station construction method based on the mechanical method and the detachable small clearance parallel jacking method as claimed in claim 1 is characterized in that: In the S40, the connecting member adopts the following structure: The connecting piece includes two C-shaped steel joints, each of which is provided with a main reinforcement. A through hole is opened on the end surface of the C-shaped steel joint away from the main reinforcement. One of the C-shaped steel joints is embedded in the horizontal pipe segment through the main reinforcement, and the other C-shaped steel joint is embedded in the end of the vertical pipe segment through the main reinforcement. The two C-shaped steel joints are abutted against each other and the C-shaped openings are both facing the small clear distance top pipe, and the through holes of the two C-shaped steel joints are opposite to each other, and the two opposite through holes are connected by a bolt joint.

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

5. The composite station construction method based on mechanical method and detachable small clearance parallel jacking method as claimed in claim 2 is characterized in that: In the S50, after the temporary vertical steel support frame is removed, a bottom plate cast-in-place layer is constructed in a plurality of small clearance top pipes in each section.

6. The composite station construction method based on mechanical method and detachable small clearance parallel jacking method as claimed in claim 1 is characterized in that: In the S30, the structures adopted by the full concrete segments and the detachable steel segments are as follows: The arc-shaped ends of the full concrete segments are at an angle of 40 degrees to the center of the circle, and adjacent full concrete segments are connected by pouring concrete. The arc-shaped ends of the detachable steel segments are at an angle of 5 degrees to the center of the circle, and the arc-shaped ends of the detachable steel segments are respectively provided with a clamping position and a slide groove, and the clamping position is slidably matched with the slide groove. Adjacent detachable steel segments are slidably matched with the clamping position and the slide groove, and the full concrete and detachable steel segments are connected by anchors.

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

8. The composite station construction method based on mechanical method and detachable small clearance parallel jacking method as claimed in claim 1 is characterized in that: In the S60, when an inclined passage is constructed between the platform layer and the station hall layer, when the inclined passage connects the platform layer and the station hall layer, the detachable steel pipe segments corresponding to the inclined passage in the platform layer tunnel can be removed, and at the same time, the transverse pipe segments corresponding to the inclined passage of the small clear distance jacking pipe in the station hall layer can be removed.

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