Construction method for forming station through shield tunnel expanding excavation

Abstract

The invention relates to a construction method for forming a station through shield tunnel expanding excavation, and relates to the field of underground construction engineering. The construction method comprises the following steps that the shield well is constructed; performing shield tunnel construction in the shield well to form at least one shield tunnel; reinforcing a soil body between the shield tunnels from the inside of the vertical shaft, and expanding and excavating section by section towards the outside of the side walls of the shield tunnels on the basis of the shield tunnels to form cavities; and after a primary support assembly is constructed in the cavity, a main body structure and a platform are constructed in the cavity, and the main body structure, the platform and the shield tunnel are connected into a whole. The cavity is expanded and excavated through the shield tunnel, the scale of the underground excavation section is reduced, the construction period is shortened, and meanwhile the construction safety is improved. The equipment layer of the station can be arranged in combination with the shield well and connected with the station hall through the channel to form the whole station. The problems that a shield is started after underground excavation of a station in a complex site, the tunnel construction period is delayed, the underground excavation scale of the station is large, safety is insufficient, and economical efficiency is poor are solved.

Description

Technical Field

[0001] The invention relates to the field of underground construction engineering, and in particular to a construction method for forming a station by excavating a shield tunnel. Background Art

[0002] With the development of cities, subway stations have become a common means of transportation for urban residents. The construction of underground stations includes tunnel construction and station platform construction. The construction of underground stations is mainly carried out by open-cut and dark-cut methods. The open-cut method refers to an underground engineering construction method in which the ground is first dug up, the lining is built in the open air, and then covered and backfilled. The dark-cut method refers to the construction method of digging holes underground without digging up the ground.

[0003] However, the open-cut method has high requirements for the road surface. At some intersections with heavy traffic, if pipelines are densely distributed and some important pipelines cannot be moved, the conditions for the construction of open-cut stations are generally not met. The construction period of the station by the dark-cut method is long, which is easy to cause tunnel construction to be delayed, and the construction period of the tunnel will be seriously delayed. On the other hand, the cross-section of the dark-cut station is large, which has certain construction risks. Summary of the invention

[0004] Regarding the relevant technologies, the construction method of underground stations is limited by the road conditions in the construction area and it is difficult to use open excavation construction. The construction using concealed excavation is slow, which can easily cause tunnel construction delays and has certain construction risks.

[0005] In a first aspect, the present application provides a construction method for forming a station by excavating a shield tunnel, which comprises the following steps:

[0006] Construction of shield shaft;

[0007] Performing shield construction in the shield shaft to form at least one shield tunnel;

[0008] Reinforce the soil between the shield tunnels, and expand the shield tunnel sidewalls to form a cavity based on the shield tunnel;

[0009] After constructing the initial support components in the cavity, the main structure of the station is constructed, and the platform is constructed in the cavity, and the platform is connected with the shield tunnel as a whole.

[0010] In combination with the first aspect, in one embodiment, performing shield construction in the shield shaft to form at least one shield tunnel includes:

[0011] Shield construction is carried out in the shield shaft along the longitudinal direction of the preset station position to form two shield tunnels arranged in parallel on both sides of the preset station position, and the length of the shield tunnel exceeds the length of the preset station position.

[0012] In combination with the first aspect, in one implementation, reinforcing the shield tunnel includes:

[0013] Constructing a pipe shed in the shield shaft along the length direction of the shield tunnel, wherein the pipe shed corresponds to the top surface position of the preset station;

[0014] Reinforcing the soil between tunnels, at the bottom and at the vault of the shield tunnel;

[0015] Pipe segments are laid on the wall surface of the shield tunnel to form an expansion ring plate, and steel brackets are set up in the shield tunnel to support the top surface of the expansion ring plate.

[0016] In combination with the first aspect, in one implementation, the reinforcing of the soil between the shield tunnels, at the bottom and at the vault includes:

[0017] The freezing method is used to reinforce the soil between the shield tunnels, at the bottom and at the vault.

[0018] In combination with the first aspect, in one embodiment, the step of excavating the shield tunnel sidewall to form a cavity based on the shield tunnel includes:

[0019] The cavity is expanded and constructed section by section along the length direction of the shield tunnel.

[0020] In combination with the first aspect, in one embodiment, the step of excavating the shield tunnel sidewall to form a cavity based on the shield tunnel includes:

[0021] Open the side segments of the two shield tunnels at the corresponding construction sections and make holes;

[0022] The step method is used to expand and dig the upper part of the soil on the opening side of the shield tunnel to form a cavity, and the core soil in the cavity is retained.

[0023] In combination with the first aspect, in one embodiment, the initial support assembly constructed in the cavity includes:

[0024] A top support is erected along the pipe scaffold, and both ends of the top support are connected to the pipe segments on the surface of the two shield tunnels;

[0025] The core soil and the soil below the cavity are excavated, and a bottom support is set up at the bottom of the cavity.

[0026] In combination with the first aspect, in one embodiment, the bottom support and the top support are both made of steel grilles or grille steel frames.

[0027] In combination with the first aspect, in one embodiment, the construction platform in the cavity includes:

[0028] Setting up a platform on the bottom support;

[0029] Columns are erected on the platform, and a station roof is constructed on the top surfaces of the columns.

[0030] In combination with the first aspect, in one implementation, the step of integrating the platform with the shield tunnel includes:

[0031] Connecting ribs are arranged on the surface segments of the shield tunnel, and are connected to the platform and the station roof through the connecting ribs.

[0032] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0033] In some complex situations, this application flexibly arranges shield shafts in places where the road is wider or in open spaces or green spaces to start the shield tunneling. Combined with the station line spacing, the tunnel plane is arranged, and the shield tunnel construction is first carried out along the longitudinal direction of the station. After the tunnel construction length exceeds the station length, the tunnel that needs to be expanded is supported by steel, and then the formed shield tunnel is used to expand and excavate section by section to form the station hall. Among them, the use of shield tunnels to expand the cavity reduces the scale of the dark excavation section, shortens the construction period, and improves the safety of construction. The equipment layer of the station can be combined with the shield shaft layout, and the various ancillaries can be combined with the surrounding site layout, connected to the station hall through passages to form the entire station. Furthermore, a pipe shed or pipe curtain is constructed through the shield shaft toward the tunnel. According to the geological conditions, the soil between the tunnels and the vault and bottom can be reinforced by freezing, grouting, MJS, rotary spraying, etc., and the supporting effect of the completed shield tunnel can be utilized. This not only reduces the cross-sectional scale of the dark excavation, but also utilizes the characteristics of fast, safe and economical shield construction. At the same time, it does not affect the construction period of the shield tunnel. It solves the problems of starting the shield after dark excavating the station in complex sites, delayed tunnel construction period, large scale of dark excavation of the station, insufficient safety, and poor economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic top view of a shield tunnel and a station in an embodiment of the present application;

[0036] Figure 2 Description of this application Figure 1 Cross-sectional view from medium AA perspective;

[0037] Figure 3Description of this application Figure 1 Cross-section view from the perspective of the middle BB.

[0038] In the figure: 1. Shield shaft; 11. Retaining structure; 2. Shield tunnel; 21. Segment; 22. Connecting ribs; 3. Cavity; 4. Initial support assembly; 41. Top support; 42. Bottom support; 51. Excavation ring plate; 52. Steel support; 6. Core soil; 7. Platform; 71. Column; 72. Platform slab; 73. Station roof; 8. Pipe shed; 91. Ground layer; 92. Overburden layer. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] Regarding the relevant technologies, the construction method of underground stations is limited by the road conditions in the construction area and it is difficult to use open excavation construction. The construction using concealed excavation is slow, which can easily cause tunnel construction delays and has certain construction risks.

[0041] First, as Figure 1 As shown, the embodiment of the present application provides a construction method for forming a station by excavating a shield tunnel, which can solve the problem that during the construction of underground stations, open excavation construction is limited by road conditions, while dark excavation construction takes a long time and has safety risks. The construction method includes the following steps:

[0042] S1. Construction of shield shaft 1.

[0043] Specifically, Figure 3 As shown, the construction of the shield shaft 1 includes constructing the main structure of the shield shaft 1, erecting the shield shaft support, and setting up the enclosure structure 11 on the side to ensure that the shield shaft 1 meets the construction requirements.

[0044] It can be understood that the construction position of the shield shaft 1 can be flexibly arranged in combination with the line and the site. Since the construction of the shield shaft 1 has a smaller impact on the road surface area and can avoid complex road surfaces such as intersections with heavy traffic, the shield shaft construction is carried out in areas with less impact on the road surface, and thus will not cause a major impact on road traffic.

[0045] S2. Perform shield construction in the shield shaft 1 to form at least one shield tunnel 2.

[0046] Specifically, shield construction is carried out in the shield shaft 1 along the longitudinal direction of the preset station position to successively form two shield tunnels 2 arranged in parallel on both sides of the preset station position. The length of the shield tunnel 2 exceeds the length of the preset station position. Pipe segments 21 are set in the contact layer between the shield tunnel 2 and the soil to complete the construction of the shield tunnel 2.

[0047] It should be noted that the construction of the shield tunnel 2 requires the measurement of the determined preset station position, and the layout of the tunnel plane in combination with the station line spacing. Then, the shield tunnel is started from the shield shaft 1 completed in step S1, and the shield tunnel 2 is constructed along the longitudinal direction of the preset station position until the shield tunnel 2 construction exceeds the length of the preset station position in its length direction, so that the construction personnel can expand the station in the shield tunnel 2 toward its side wall.

[0048] S3. Reinforce the soil of the shield tunnel 2, and based on the shield tunnel 2, dig outwards from the side wall of the shield tunnel 2 to form a cavity 3.

[0049] The above-mentioned reinforcement of the soil of the shield tunnel 2 includes:

[0050] a. After the shield tunnel 2 construction in step S2 is completed, Figure 3 As shown, a pipe shed 8 or pipe curtain is constructed in the shield shaft 1 along the length direction of the shield tunnel 2. The pipe shed 8 or pipe curtain corresponds to the top surface position of the preset station and is located above the preset station position.

[0051] b. Soil reinforcement: Based on the geological conditions, the soil between the tunnels and the top and bottom of the shield tunnel 2 is reinforced from within the shaft.

[0052] Specifically, freezing method, grouting, MJS, rotary grouting, etc. can be used to reinforce the soil between the tunnels of shield tunnel 2 and the vault and bottom.

[0053] Among them, the principle of freezing method to reinforce the stratum is to use artificial refrigeration method to send low-temperature refrigerant into the stratum, freeze the stratum around the excavation body into a closed continuous frozen soil wall to resist soil pressure and isolate the connection between groundwater and the excavation body; then, under the protection of this closed continuous frozen soil wall, excavation and permanent support are carried out. It is a special stratum reinforcement method. The refrigerant entering the stratum is connected to the stratum through the inlet and return pipes, and heat is exchanged with the stratum through the freezing pipe, transferring the cold to the surrounding stratum and taking away the heat in the stratum. As a result, the stratum around the freezing pipe is continuously cooled from near to far, gradually turning the water in the stratum into ice, and the originally loose or porous stratum is cemented together by ice to form an impermeable frozen soil column. Several such freezing pipes are arranged, and the refrigerant in the freezing pipes is continuously circulated, so that the soil around these freezing pipes is frozen into frozen soil columns. As the radius of the frozen soil column continues to expand, adjacent frozen soil columns will be connected, and they will be tightly combined with each other through ice to form a sealed continuous wall.

[0054] It is understandable that the soil reinforced by freezing method has water-sealing property, that is, free water (in general, the water content should be greater than 10%, otherwise auxiliary methods of increasing soil moisture should be adopted) can be frozen into frozen soil and form frozen soil wall. Whether it is a permeable layer or a water-proof layer, the frozen soil wall can block the intrusion of groundwater and form a dry construction environment. Secondly, the soil has high strength. It is generally believed that frozen soil is a viscoelastic plastic material. Its strength is related to factors such as soil quality, bulk density, water content, salt content and temperature. It can generally reach 2-10MPa, which is much greater than the strength of thawed soil, thus playing the role of structural support wall. Furthermore, the soil reinforced by freezing method is suitable for various soil layers and various underground projects, especially for underground projects with high water content, weak strata, and difficult or impossible construction by other construction methods. After the construction, the soil layer returns to its original state, which is very destructive to the soil layer. This is unmatched by other construction methods. It has the ability to bypass obstacles, freeze reinforcement and seal water. The freezing method uses electricity to exchange for cold energy, does not pollute the atmospheric environment, does not emit harmful substances, and does not pollute groundwater. Its superiority is particularly obvious in projects with high environmental protection requirements. The freezing period, freezing wall thickness, and freezing wall shape of the freezing method can be adjusted. The freezing method can be constructed in densely built areas and under existing engineering buildings without the need for foundation pit drainage, which can avoid the adverse effects of foundation settlement caused by pumping water on surrounding buildings. The freezing method has no support lining and no anchoring, and can be open-type construction, expand the building area, and shorten the construction period.

[0055] Grouting is suitable for strengthening the foundation of sand, silt, clay and artificial fill. Before designing grouting reinforcement, indoor slurry ratio test and on-site grouting test should be carried out to determine the design parameters and test the construction methods and equipment. If there is regional experience, the design parameters can be determined according to the regional experience.

[0056] In grouting reinforcement, the slurry material for grouting reinforcement of the foundation can be a suspension with cement as the main agent, or a two-liquid mixture of cement and water glass. The slurry for anti-seepage and plugging grouting can be water glass, a mixture of water glass and cement, or a chemical slurry. Chemical slurry that pollutes the environment should not be used. For foundation soil layers with groundwater flow. Low slump cement mortar can be used for compaction grouting, and drainage channels should be set up. The spacing of grouting holes should be determined based on field tests. The grouting holes can be arranged inside, outside or inside the foundation. After grouting in the foundation, measures should be taken to seal the foundation. The grouting method is simple to construct and has a wide range of applications. However, a large amount of grouting materials are required, and the price of grouting materials is relatively high, and the cost is also correspondingly high. The effect of grouting reinforcement is affected by many factors, such as ground conditions, the selection of grouting materials and construction technology, so the effect is difficult to guarantee, and the construction process needs to be closely monitored.

[0057] c. Installing an expansion support assembly in the shield tunnel 2.

[0058] Specifically, Figure 2 As shown, segments 21 are laid on the wall surface of the shield tunnel 2 to form an expansion ring plate 51 , and steel brackets 52 are set up in the shield tunnel 2 to support the top surface of the expansion ring plate 51 .

[0059] Furthermore, an expansion ring plate 51 is formed in the area to be expanded in the tunnel and in front and rear outer expansion segments 21, and a steel support 52 in the shield tunnel 2 is used to support the top.

[0060] The above-mentioned method of expanding and excavating the side wall of the shield tunnel 2 to form the cavity 3 based on the shield tunnel 2 includes: opening the pipe segments 21 of the two shield tunnels 2 on the opening side, and expanding and excavating the cavity 3 from the side walls of the two shield tunnels 2 toward the middle.

[0061] Specifically, the two side segments 21 of the shield tunnels 2 corresponding to the construction sections are opened and the holes are opened. The upper part of the soil body on the opening side of the shield tunnel 2 is expanded by using the step method to form a cavity 3, and the core soil 6 in the cavity 3 is retained.

[0062] In some preferred embodiments, the cavity 3 is excavated and constructed section by section along the length direction of the shield tunnel 2 (or the longitudinal direction of the preset station location).

[0063] It is understandable that the expansion construction step can be carried out in a longitudinal section-by-section manner to improve the construction efficiency. Specifically, the shield tunnel 2 can be longitudinally divided into a plurality of construction sections, each section can be 6 to 12 m long, and the construction is carried out section by section. The pipe segment 21 on the opening side of the section can be opened, and the upper part can be excavated by the step method, and the core soil 6 can be retained.

[0064] S4. After constructing the initial support assembly 4 in the cavity 3, construct the platform 7 and the main structure in the cavity 3, construct them section by section, and connect the main structure, the platform and the shield tunnel 2 as one.

[0065] The above-mentioned construction of the initial support assembly 4 in the cavity 3 includes the following steps:

[0066] Step A: erecting a top support 41 along the pipe scaffold 8 , and connecting two ends of the top support 41 to the pipe segments 21 on the surface of the two shield tunnels 2 .

[0067] Step B: excavating the core soil 6 and the soil below the cavity 3 , and setting up a bottom support 42 at the bottom of the cavity 3 .

[0068] Specifically, the bottom support 42 and the top support 41 are both made of steel gratings or grating steel frames. After the top support 41 is erected, spraying and mixing are performed, and then the core soil 6 and the lower soil body are excavated, and the bottom support 42 is constructed.

[0069] The above-mentioned construction of the platform 7 and the main structure in the cavity 3 includes: setting up the platform 7 on the bottom support 42 .

[0070] Specifically, the platform and main structure are constructed by first constructing the station floor, constructing the station bottom longitudinal beam, then constructing the platform board, and setting up the support frame. Columns 71 are set up on the platform 7, and the station roof 73 is constructed on the top surface of the columns 71 to complete the construction of the platform 7.

[0071] It is understandable that the above-mentioned process of erecting the platform and the main structure can be carried out in a section-by-section manner to improve construction efficiency.

[0072] Furthermore, the above-mentioned connecting the main structure, platform 7 and shield tunnel 2 as one includes: setting connecting ribs 22 on the surface segments 21 of the shield tunnel 2, and connecting with the platform 7 and the station top plate 73 through the connecting ribs 22. Reinforcement joints are reserved at the end of the construction section, and then the next section is constructed until the entire station structure is completed, and then the steel support 52 in the tunnel is removed.

[0073] It can be understood that the connection ribs 22 are used to form the pipe segments 21 and the platform 7 structure as a whole, which improves the stability of the underground excavation of the station and greatly reduces the construction risk of the underground station.

[0074] On the other hand, Figure 2 As shown, the present application provides an underground station, which includes: two shield tunnels 2 arranged in parallel and a platform 7 arranged in the two shield tunnels 2 and connected with the two shield tunnels 2 as a whole.

[0075] To summarize, in some complex situations, this application flexibly arranges shield shafts in places where the road is wider or in open spaces or green spaces to start shield tunneling. Combined with the station line spacing, the tunnel plane is arranged, and shield tunnel construction is first carried out along the longitudinal direction of the station. After the tunnel construction length exceeds the station length, the tunnel that needs to be expanded is supported by steel profiles, and then the formed shield tunnel is used to expand and excavate section by section to form the station hall. The use of shield tunnels to expand the cavity reduces the scale of the dark excavation section, shortens the construction period, and improves the safety of construction. The equipment layer of the station can be arranged in combination with the shield shaft, and the various ancillaries can be arranged in combination with the surrounding site, connected to the station hall through passages to form the entire station. Furthermore, a pipe shed or pipe curtain is constructed through the shield shaft toward the tunnel. According to the geological conditions, the soil between the tunnels and the vault and bottom can be reinforced by freezing, grouting, MJS, rotary spraying, etc., and the supporting effect of the completed shield tunnel can be utilized. This not only reduces the cross-sectional scale of the dark excavation, but also utilizes the characteristics of fast, safe and economical shield construction. At the same time, it does not affect the construction period of the shield tunnel. It solves the problems of starting the shield after dark excavating the station in complex sites, delayed tunnel construction period, large scale of dark excavation of the station, insufficient safety, and poor economy.

[0076] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0077] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0078] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A construction method for forming a station by excavating a shield tunnel, characterized in that: include: Construction of shield shaft (1); Performing shield construction in the shield shaft (1) to form at least one shield tunnel (2); Reinforcing the soil between the shield tunnels (2), and expanding and digging outwards from the side walls of the shield tunnel (2) based on the shield tunnel (2) to form a cavity (3); After the initial support assembly (4) is constructed in the cavity (3), the main structure of the station and the platform (7) are constructed in the cavity (3), and the main structure, the platform (7) and the shield tunnel (2) are connected as a whole.

2. The construction method according to claim 1, characterized in that: The shield construction is performed in the shield shaft (1) to form at least one shield tunnel (2), comprising: Shield construction is carried out in the shield shaft (1) along the longitudinal direction of the preset station position to form two shield tunnels (2) arranged in parallel on both sides of the preset station position, and the length of the shield tunnel (2) exceeds the length of the preset station position.

3. The construction method according to claim 2, characterized in that: The method of reinforcing the soil between the shield tunnels (2) comprises: Constructing a pipe shed (8) in the shield shaft (1) along the length direction of the shield tunnel (2), wherein the pipe shed (8) corresponds to the top surface position of the preset station; Reinforcing the soil between tunnels, at the bottom and at the vault of the shield tunnel (2); Pipe segments (21) are laid on the wall surface of the shield tunnel (2) to form an expansion ring plate (51), and a steel support (52) is erected in the shield tunnel (2) to support the top surface of the expansion ring plate (51).

4. The construction method according to claim 3, characterized in that: The reinforcement of the soil between, at the bottom and at the top of the shield tunnel (2) comprises: The freezing method is used to reinforce the soil between, at the bottom and at the top of the shield tunnel (2).

5. The construction method according to claim 3, characterized in that: The step of expanding and excavating the side wall of the shield tunnel (2) to form a cavity (3) based on the shield tunnel (2) comprises: The cavity (3) is expanded and constructed section by section along the length direction of the shield tunnel (2).

6. The construction method according to claim 5, characterized in that: The step of expanding and excavating the side wall of the shield tunnel (2) to form a cavity (3) based on the shield tunnel (2) comprises: Opening the side segments (21) of the two shield tunnels (2) corresponding to the construction sections and drilling holes; The step method is used to expand and dig the upper part of the soil body on the opening side of the shield tunnel (2) to form a cavity (3), and the core soil (6) in the cavity (3) is retained.

7. The construction method according to claim 6, characterized in that: The initial construction support assembly (4) in the cavity (3) comprises: A top support (41) is erected along the pipe shed (8), and two ends of the top support (41) are connected to two pipe segments (21) on the surface of the shield tunnel (2); The core soil (6) and the soil below the cavity (3) are excavated, and a bottom support (42) is erected at the bottom of the cavity (3).

8. The construction method according to claim 7, characterized in that: The bottom support (42) and the top support (41) are both made of steel grilles or grille steel frames.

9. The construction method according to claim 7, characterized in that: The construction of the station main structure and the platform (7) in the cavity (3) comprises: Setting up a platform plate (72) on the bottom support (42); A column (71) is erected on the platform slab (72), and a station roof (73) is constructed on the top surface of the column (71).

10. The construction method according to claim 9, characterized in that: Connecting the main structure, the platform (7) and the shield tunnel (2) into one body comprises: Connecting ribs (22) are provided on the surface segments (21) of the shield tunnel (2), and the segments (21) are connected to the platform (7) and the station roof (73) via the connecting ribs (22).

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