Single-layer steel shell sinking pipe of shield segment lining and construction method thereof

Abstract

The application relates to the underwater tunnel immersed tube technology field and provides a single-layer steel shell immersed tube of a shield segment lining and a construction method thereof, wherein the single-layer steel shell immersed tube of the shield segment lining comprises a steel shell structure, the steel shell structure is a single-layer shell body, the cross section of the steel shell structure is in an elliptical shape, the long axis of the elliptical shape is arranged in a horizontal direction, the inner side of the steel shell structure is provided with a shield segment, and mortar is filled between the shield segment and the steel shell structure. The single-layer steel shell immersed tube of the shield segment lining can solve the problems that the existing immersed tube technology needs a special dry dock or a factory to manufacture, and a special floating channel needs to be excavated during transportation, can save construction cost and construction period, and can reduce the influence on the environment.

Description

Technical Field

[0001] This invention relates to the field of underwater tunnel immersed tube technology, and in particular to a single-layer steel shell immersed tube with shield tunnel segment lining and its construction method. Background Technology

[0002] In current immersed tunnel construction projects at home and abroad, the main types of immersed tunnel structures are double-layer steel shell immersed tunnel structures and reinforced concrete immersed tunnel structures. The main structure of both types of immersed tunnels is cast with self-compacting concrete and needs to be prefabricated in a special prefabrication dry dock or factory. Moreover, the concrete structure is heavy, and the existing immersed tunnels can usually reach a draft of 8 to 9 meters. During transportation, they also need to be floated to the tunnel site through a special floating channel.

[0003] For existing technologies, the construction of prefabrication dry docks, factories, and floating channels for immersed tunnels is not only a large-scale project with high construction costs, but also has a significant impact on the environment. Furthermore, if the construction is carried out in shallow and narrow inland waterways or waters where bridge navigation is restricted, the excavation of floating channels and the floating of tunnel sections are accompanied by extremely high safety risks. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of high construction costs, long construction periods, and significant environmental damage caused by the use of a large amount of self-compacting concrete as the main body in existing immersed tunnel technology, which results in excessive weight and the need to excavate special floating transport channels during transportation. The invention provides a single-layer steel shell immersed tunnel with shield tunnel segment lining and its construction method.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A single-layer steel shell immersed tube with shield tunnel segment lining includes a steel shell structure; the steel shell structure is a single-layer shell; the cross-section of the steel shell structure is elliptical; the major axis of the ellipse is set in the horizontal direction; shield tunnel segments are arranged on the inner side of the steel shell structure; mortar is filled between the shield tunnel segments and the steel shell structure.

[0007] The specific semi-major axis and semi-minor axis dimensions of the steel shell structure should match the dimensions of the planned driveway and other ancillary facilities such as crash barriers. Apart from the cross-sectional shape and the use of shield tunnel segments as internal lining, the steel shell structure should conform to general immersed tube design, such as having sufficient structural strength to resist water pressure, having sufficient anti-buoyancy coefficient, and having waterstops and connecting structures at the ends.

[0008] Existing mature shield tunneling segments can be used for tunneling.

[0009] Using a steel shell structure and shield tunnel segments as the main structure of the immersed tunnel, and connecting them with mortar, this scheme is lighter in weight and has a shallower draft than the existing scheme that uses cast-in-place concrete as the main structure, while having the same internal tunnel space. It also has lower requirements for floating transport channels, eliminating the need to excavate a dedicated floating transport channel. This reduces construction costs and shortens the construction period, while also mitigating environmental damage around the tunnel site and reducing the impact of transporting the steel shell structure on other navigation routes.

[0010] Meanwhile, the main structure does not use a large amount of cast-in-place concrete, making it easier to control manufacturing precision and adjust the relationship between self-weight and volume to achieve a critical balance between self-weight and buoyancy. This reduces the requirements on other equipment, such as ship performance, during the transportation, sinking, and docking of the immersed tubes. Furthermore, this scheme does not need to consider the differences in concrete materials in different regions, which would lead to different cross-sections and reinforcement designs for each section of the immersed tube. This allows for a unified cross-section design for each section of the immersed tube, reducing design difficulty and facilitating the standardization of its manufacturing templates. The limited use of concrete also simplifies the construction process, improves the construction environment, and shortens the construction period, making it easier to ensure construction quality and reduce the investment of management resources.

[0011] The elliptical cross-section steel shell structure of this design is closer to the tunnel's construction boundary than a circular one, thus offering greater space utilization. It can relatively reduce the cross-sectional height, the depth of the foundation trench, and the amount of masonry work, thereby shortening the construction period and saving construction costs. Compared to a square design, this design has a more rational stress distribution, effectively reducing stress concentration and thus better resisting traffic loads and seismic impact loads. At the same time, using an elliptical cross-section also allows for convenient use of existing arc-shaped shield tunnel segment technology, without the need to customize other irregularly shaped shield tunnel segments.

[0012] Compared to the existing double-shell steel structure immersed tunnel, this scheme uses only a single-shell steel structure and does not have the large number of steel compartments between the two layers of steel shells in the double-shell steel structure immersed tunnel. Therefore, it uses less steel, has a simpler structure, and can significantly reduce costs and shorten the shell manufacturing period.

[0013] This scheme uses tunnel lining segments as the lining for the immersed tunnel, which is a mature technology with a high degree of factory production, highly controllable quality, and mature assembly process, which facilitates project progress control, quality control, and construction cost control.

[0014] As a preferred embodiment of the present invention, there are at least two steel shell structures; each of the steel shell structures is arranged side by side; adjacent two steel shell structures are connected by support rods; the support rods are distributed at intervals along the axial direction of the steel shell structure.

[0015] The spacing and number of each steel shell structure should be designed according to the specific requirements of the driving lanes in the project.

[0016] With the same cross-sectional area, this scheme has a lower cross-sectional height compared to the single steel shell structure scheme, which can reduce the excavation depth of the foundation trench and reduce the amount of masonry work, thereby shortening the construction period and saving construction costs.

[0017] Using multiple support rods spaced apart along the axial direction of the steel shell structure to connect the various steel shell structures has two advantages. First, the load is more distributed. By setting an appropriate safety factor, even if some support rods fail, the connection between the steel shell structures can still be maintained, making this solution more maintainable. Second, if there are other structures between the steel shell structures, the spaced support rods also facilitate the construction of other structures between the steel shell structures.

[0018] As a preferred embodiment of the present invention, a partition structure is further connected between two adjacent steel shell structures; the partition structure is of the same length as the steel shell structure; there are at least two partition structures and they are distributed at intervals along the height direction of the steel shell structure.

[0019] The height direction of a steel shell structure refers to the direction parallel to the minor axis of an elliptical steel shell structure.

[0020] The partition structure can be mechanically connected to each steel shell structure, but the joints should be waterproofed; the partition structure can also be welded to the steel shell structure to enhance its waterproofing ability.

[0021] The specific number and spacing of the partition structures can be determined according to the specific needs of the enclosed space. If the space between the partition structures is used as a maintenance passage, the spacing of the partition structures should be based on the dimensions of the maintenance equipment and personnel.

[0022] The vertically spaced partition structure can serve as the bottom formwork for ballast concrete, and can also form an enclosed space between two adjacent steel shell structures to accommodate other equipment or personnel, such as pipeline passages or maintenance passages; the partition structure can also assist in connecting adjacent steel shell structures with support rods.

[0023] As a preferred embodiment of the present invention, an external ballast concrete structure is cast on the upper surface of the uppermost partition structure or the lower surface of the lowermost partition structure.

[0024] When the external ballast concrete structure is placed on the lower surface of the bottom partition structure, the center of gravity of the immersed tube structure can be lowered; when the external ballast concrete structure is placed on the upper surface of the top partition structure, the pouring of the external ballast concrete structure can be facilitated.

[0025] Because the immersed tunnel structure requires at least a 10% anti-buoyancy coefficient after sinking, the thickness of the ballast concrete structure is often relatively large. Compared with the existing scheme of setting the ballast concrete structure entirely inside the immersed tunnel structure, this scheme pours the external ballast concrete structure on the outside of the steel shell structure, which can save the internal volume of the immersed tunnel structure, improve the space utilization rate, thereby relatively reducing the cross-sectional height and the excavation depth of the foundation trench, reducing the amount of masonry work, and thus shortening the construction period and saving construction costs. Moreover, when pouring the external ballast concrete structure, this scheme can directly use the groove formed by the partition structure and the steel shell structure connected to both sides as the concrete template, which is convenient for the pouring operation.

[0026] As a preferred embodiment of the present invention, the end face of the steel shell structure is provided with a PC cable; the PC cable is used to connect two longitudinally adjacent steel shell structures.

[0027] In this design, "longitudinal" refers to the direction along the axial direction of the steel shell structure.

[0028] By using PC cables to connect the steel shell structures end to end, there is no need to set up sealing templates or pour concrete, which can further reduce the amount of concrete pouring work, simplify the connection process, and shorten the construction period.

[0029] As a preferred embodiment of the present invention, a ventilation channel partition is provided on the upper part of the steel shell structure; the length of the ventilation channel partition is equal to the length of the steel shell structure; the channel formed by the ventilation channel partition and the corresponding upper part of the steel shell structure is used for ventilation.

[0030] Ventilation duct partitions can be simple flat or curved panels, or they can be irregularly shaped panels used to install other equipment such as lighting fixtures and ventilation equipment; the specific dimensions of the ventilation duct formed by the ventilation duct partitions correspond to the ventilation requirements.

[0031] The ventilation duct partition in this design not only divides the interior of the steel shell structure into a dedicated ventilation channel, but also serves as a mounting plate for other top equipment such as lighting fixtures; at the same time, this design can also increase the compressive strength of the steel shell structure.

[0032] As a preferred embodiment of the present invention, it also includes a road surface structure; the road surface structure is connected to the shield tunnel segment via road surface columns.

[0033] Road surface structures can be roadways, sidewalks, or a combination thereof.

[0034] This scheme uses road column to set the horizontal road structure on the inner wall of the elliptical steel shell structure. The road column can lift the road structure to near the long axis of the elliptical steel shell to increase space utilization. The space between the road structure and the shield tunnel segment can also be used as a pipeline or drainage channel.

[0035] A construction method for a single-layer steel shell immersed tunnel with shield tunnel segment lining includes the following steps:

[0036] A. Lower the steel shell structure to the tunnel site;

[0037] B. Drain the underwater steel shell structure; install shield tunnel segments inside the steel shell structure; pour mortar between the shield tunnel segments and the steel shell structure.

[0038] Except for assembling the shield tunnel segments after the steel shell structure has sunk, the manufacturing, transportation, docking, and backfilling of the single-layer steel shell immersed tube lined with shield tunnel segments in this scheme can all refer to the construction steps of existing immersed tube structures.

[0039] When manufacturing steel shell structures, a dedicated dry dock or factory can be built on-site, or an existing factory can be utilized. When manufacturing single-layer steel shell immersed tubes lined with shield tunnel segments, in addition to the steel shell structure, other accessories or auxiliary equipment required for subsequent steps, such as measuring towers, traction columns, and ballast systems, can be installed in the factory at the same time, or they can be installed as needed.

[0040] During the floating process, temporary sealing gates can be added to both ends of the single-layer steel shell immersed tube lined with shield tunnel segments to facilitate the floating.

[0041] When sinking the steel shell structure to the bottom, the single-layer steel shell immersed tube lined with shield tunnel segments can be sinked all at once before proceeding to the next step, or the next step can be carried out after sinking each section of the single-layer steel shell immersed tube lined with shield tunnel segments.

[0042] During the docking process, appropriate docking methods, such as welding, wet joints, or mechanical connections, may be adopted depending on the tunnel site conditions and construction equipment limitations.

[0043] When backfilling, the existing backfilling specifications should be referred to, depending on the tunnel site conditions and the limitations of construction equipment.

[0044] Once the steel shell structures of each section are connected and drained, the installation and construction of tunnel ancillary equipment or structures, such as roadways, lighting fixtures, and cables, can be carried out.

[0045] Assembling the shield tunnel segments, one of the main components of the single-layer steel shell immersed tunnel, after the steel shell structure has sunk can significantly reduce the weight of the single-layer steel shell immersed tunnel during transportation, thereby significantly reducing the draft of the single-layer steel shell immersed tunnel during floating, and thus reducing the water depth required for floating channel; moreover, reducing the weight of the single-layer steel shell immersed tunnel during floating also makes mooring and positioning operations more convenient.

[0046] As a preferred embodiment of the present invention, when an external ballast concrete structure is provided outside the steel shell structure, the external ballast concrete structure is poured before step A.

[0047] Since the external ballast concrete is placed outside the steel shell structure, this scheme allows the external ballast concrete structure to be poured before the steel shell structure sinks, which reduces the difficulty of pouring the external ballast concrete structure and avoids underwater construction.

[0048] As a preferred embodiment of the present invention, fine sand is used as backfill soil when backfilling the steel shell structure with the covering layer.

[0049] This solution uses fine sand backfill soil as the cover layer. The backfill soil can better fit the outer surface of the steel shell structure, thus providing good support for the steel shell structure.

[0050] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0051] 1. Compared with existing technologies, this invention uses a steel shell structure and shield tunnel segments as the main body of the immersed tunnel, thus eliminating the need for large-scale on-site concrete pouring. Existing steel processing plants, such as shipyards, can be used for processing, avoiding the need to build temporary dry docks or factories at the tunnel site. Furthermore, this invention is lighter in weight, has a shallow draft during floating, and requires less water depth in the floating channel. In other words, this invention can save construction costs and shorten the construction period in both manufacturing and transportation stages, while also reducing environmental damage at the tunnel site, which is more in line with the increasing environmental protection requirements.

[0052] 2. The construction method of the present invention adopts the sequence of floating and sinking the steel shell structure before installing the shield tunnel segments. This can significantly reduce the self-weight of the single-layer steel shell immersed tube lined with shield tunnel segments during floating, thereby reducing the draft of the single-layer steel shell immersed tube lined with shield tunnel segments during floating, reducing the water depth requirement of the floating channel, and thus saving construction costs and shortening the construction period.

[0053] 3. The elliptical cross-section steel shell structure of this invention is closer to the construction boundary of the tunnel than the circular one, thus having a greater space utilization rate. It can relatively reduce the cross-sectional height, thereby reducing the excavation depth of the foundation trench and the amount of masonry work, thereby shortening the construction period and saving construction costs. Compared with the square one, the stress distribution of this invention is more reasonable, which can effectively reduce stress concentration and thus better resist traffic loads and seismic impact loads.

[0054] 4. Compared with the existing double-layer steel shell immersed tube structure, the present invention has only a single-layer steel shell structure and does not have a large number of steel compartments between the two layers of steel shell structure. Therefore, it uses less steel, has a simpler structure, and can significantly reduce costs and shorten the shell manufacturing period.

[0055] 5. Tunnel boring machine segments are a mature technology with a high degree of factory production, highly controllable quality, and mature assembly process, which facilitates project progress control, quality control, and construction cost control.

[0056] 6. Since it does not require a large amount of concrete pouring, the present invention has a simpler process than the existing technology, a better construction environment, makes it easier to ensure construction quality, and reduces the investment of management resources. Attached Figure Description

[0057] Figure 1 This is a three-dimensional structural diagram of a single-layer steel shell immersed tube lined with shield tunnel segments in Example 1.

[0058] Figure 2 This is a schematic cross-sectional view of the single-layer steel shell immersed tube with shield tunnel segment lining in Example 1.

[0059] Figure 3 This is a three-dimensional structural diagram of a single-layer steel shell immersed tube with shield tunnel segment lining in Example 2;

[0060] Figure 4 This is a schematic cross-sectional view of the single-layer steel shell immersed tube with shield tunnel segment lining in Example 2.

[0061] Icons: 1-Steel shell structure; 2-Shield tunnel segment; 3-Support rod; 4-External ballast concrete structure; 5-Baffle structure; 6-Road structure; 7-Road column; 8-Crash block; 11-Ventilation passage partition. Detailed Implementation

[0062] The present invention will now be described in detail with reference to the accompanying drawings.

[0063] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0064] Example 1

[0065] like Figure 1 and Figure 2 As shown, the single-layer steel shell immersed tube with shield tunnel segment lining adopted in this invention includes a steel shell structure 1 and shield tunnel segments 2, with shield tunnel segments 2 laid on the inner wall of the steel shell structure 1; in this embodiment, the shield tunnel segments 2 are customized shield tunnel segments 2 for elliptical cross sections, and are staggered and assembled on the inner wall of the steel shell structure 1.

[0066] The space between the shield tunnel segment 2 and the steel shell structure 1 is also filled with mortar. In this embodiment, mortar with a strength greater than or equal to 40MPa is used for filling.

[0067] The steel shell structure 1 is also equipped with PC cables, end plates, and waterproof strips on the end plates at both ends for docking operations.

[0068] It should be noted that the PC cable in this embodiment is a method of connecting the single-layer steel shell immersed tube of each shield tunnel segment lining to simplify the process. Depending on the requirements and scenarios, other connection methods such as welding connection or cast-in-place concrete joint can also be used.

[0069] Example 2

[0070] like Figure 3 and Figure 4 As shown, based on Embodiment 1, the single-layer steel shell immersed tube with shield tunnel segment lining adopted in this invention has two steel shell structures 11, which are arranged side by side along the long axis of one of the steel shell structures 11; the two steel shell structures 11 are connected by support rods 33 distributed at intervals along the axis of the steel shell structure 11, and in order to ensure the connection effect, support rods 33 are provided at both the upper and lower ends of the steel shell structure 11.

[0071] Between two adjacent steel shell structures 11, a partition structure 55 is also provided; in this embodiment, the partition structure 55 is a plate parallel to the horizontal plane, and there are two of them. The channel between the two partition structures 55 serves as a maintenance channel.

[0072] It should be noted that the two steel shell structures 11 in this embodiment correspond to the two driving lanes in the two directions. If the driving lanes have different requirements for installation space, the number of steel shell structures 11 can be increased or decreased.

[0073] Example 3

[0074] like Figures 1 to 4 As shown, based on embodiments 1 and 2, a ventilation channel partition 11 is also provided inside the steel shell structure 1;

[0075] In this embodiment, the ventilation duct partition 11 is a horizontal plate disposed in the upper half of the steel shell structure 1, and the channel formed by it and the inner side of the steel shell structure 1 is used for ventilation.

[0076] Example 4

[0077] like Figures 1 to 4 As shown, based on embodiments 1 to 3, it also includes a road surface structure 6 as a driving lane; the road surface structure 6 is connected to the shield tunnel segment 2 via road surface pillars 7. Anti-collision piers 8 are also provided at both ends of the road surface structure 6; there is a gap between the anti-collision piers 8 and the road surface structure 6 to guide water flow into the area beneath the road surface structure 6.

[0078] This embodiment is a specific scheme for installing a roadway inside a single-layer steel shell immersed tube lined with shield tunnel segments.

[0079] Example 5

[0080] like Figures 1 to 4As shown, the construction method of a single-layer steel shell immersed tunnel for shield tunnel segment lining in any one of Examples 1 to 4, as used in this invention, includes the following steps:

[0081] S1. Fabricate the steel shell structure 1 of the single-layer steel shell immersed tube for shield tunnel segment lining; when the single-layer steel shell immersed tube for shield tunnel segment lining includes multiple elliptical steel shell structures 1, the support rods 3 and partition structures 5 connecting two adjacent steel shell structures 1 are also fabricated together. Since the groove formed by the partition structure 5 and the steel shell structures 1 connected on both sides can be directly used as the template for the external ballast concrete structure 4, the external ballast concrete structure 4 can also be poured in this step to avoid underwater operations.

[0082] Other devices that need to be installed on the steel shell structure 1 during construction, such as the measuring tower, can be installed together in this step, or they can be installed on site when needed.

[0083] S2, Floating steel shell structure 1 to the tunnel site;

[0084] In this embodiment, temporary sealing gates are installed at both ends of the steel shell structure 1 during floating to allow the steel shell structure 1 to float on the water surface.

[0085] S3. Moor and position the steel shell structure 1; after positioning, fill the steel shell structure 1 with water to make it sink;

[0086] After being transported to the designated location, the structure can be positioned with the assistance of other equipment or vehicles, such as by using anchor blocks and cables for positioning. For sinking, in this embodiment, a water tank is installed in the steel shell structure 1 and water is added to the water tank to sink the steel shell structure 1 to the predetermined position.

[0087] S4. Repeat steps S2 to S3 until there are at least two sections of steel shell structure 1 underwater;

[0088] In this embodiment, after the first steel shell structure 1 is submerged in water and positioned, the subsequent steps are executed directly after each other steel shell structure 1 is submerged in water to reduce waiting time.

[0089] S5, Underwater docking steel shell structure 1;

[0090] In this embodiment, a pull-and-close jack is used to pull the two adjacent steel shell structures 1 closer together until the waterproof strips on the end plates are squeezed and closed; after connecting the PC cables at corresponding positions of the two adjacent steel shell structures 1, the pressure of the pull-and-close jack is released and the pull-and-close jack is removed; finally, the PC cables are treated with anti-corrosion to complete the connection.

[0091] S6. Backfill the steel shell structure 1 with a covering layer;

[0092] The backfilling of the cover layer can refer to the existing technical solution. First, lock backfilling is carried out on both sides of the steel shell structure 1 to lock the position of the steel shell structure 1. Then, general backfilling is carried out on the bottom of the steel shell structure 1 to make the bottom of the steel shell structure 1 uniformly stressed. After the general backfilling is completed, the outfitting installed on the steel shell structure 1 during transportation or positioning is removed, and the protective layer backfilling is carried out to protect the steel shell structure 1 from the outside.

[0093] Furthermore, in this embodiment, fine sand is used as backfill soil to make the backfill soil fit more closely to the outer wall of the single-layer steel shell immersed tube lined with shield tunnel segments in this scheme.

[0094] S7. Drain the interconnected steel shell structures 1;

[0095] S8. Install shield tunnel segments 2 inside the steel shell structure 1 and fill the space between shield tunnel segments 2 and steel shell structure 1 with mortar; complete the construction of the single-layer steel shell immersed tunnel with shield tunnel segment lining.

[0096] After step S8 is completed, the interior of the single-layer steel shell immersed tube lined with shield tunnel segments can be decorated according to specific project requirements. For example, road structure 6 and road column 7 can be installed on the single-layer steel shell immersed tube lined with shield tunnel segments that need to be open to traffic, and ventilation channel partition 11 can be installed on the steel shell immersed tube structure that requires ventilation.

[0097] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A single-layer steel shell immersed tunnel with shield tunnel segment lining, comprising a steel shell structure (1), characterized in that, The steel shell structure (1) is a single-layer shell; the cross-section of the steel shell structure (1) is elliptical; the major axis of the ellipse is set in the horizontal direction; shield tunnel segments (2) are set on the inner side of the steel shell structure (1); mortar is filled between the shield tunnel segments (2) and the steel shell structure (1); temporary sealing doors are installed at both ends of the steel shell structure (1); There are at least two steel shell structures (1); each steel shell structure (1) is arranged side by side; two adjacent steel shell structures (1) are connected by support rods (3); the support rods (3) are distributed at intervals along the axial direction of the steel shell structure (1); A partition structure (5) is also connected between two adjacent steel shell structures (1); the partition structure (5) is the same length as the steel shell structure (1); there are at least two partition structures (5) and they are distributed at intervals along the height direction of the steel shell structure (1); An external ballast concrete structure (4) is poured on the upper surface of the uppermost partition structure (5) or the lower surface of the lowermost partition structure (5).

2. The single-layer steel shell immersed tube with shield tunnel segment lining according to claim 1, characterized in that, PC cables are provided on the end face of the steel shell structure (1); the PC cables are used to connect two longitudinally adjacent steel shell structures (1).

3. A single-layer steel shell immersed tube with shield tunnel segment lining according to claim 1, characterized in that, The upper part of the steel shell structure (1) is provided with a ventilation channel partition (11); the length of the ventilation channel partition (11) is equal to the length of the steel shell structure (1); the ventilation channel partition (11) and the corresponding upper part of the steel shell structure (1) form a channel for ventilation.

4. A single-layer steel shell immersed tube with shield tunnel segment lining according to claim 1, characterized in that, It also includes a road surface structure (6); the road surface structure (6) is connected to the shield tunnel segment (2) via road surface columns (7).

5. A construction method for a single-layer steel shell immersed tunnel with shield tunnel segment lining, applicable to a single-layer steel shell immersed tunnel with shield tunnel segment lining as described in any one of claims 1 to 4, characterized in that, Includes the following steps: A. Sink the steel shell structure (1) to the tunnel site; B. Drain the underwater steel shell structure (1); install shield tunnel segments (2) inside the steel shell structure (1); pour mortar between the shield tunnel segments (2) and the steel shell structure (1).

6. The construction method for a single-layer steel shell immersed tunnel with shield tunnel segment lining as described in claim 5, characterized in that, When an external ballast concrete structure (4) is provided outside the steel shell structure (1), the external ballast concrete structure (4) is poured before step A.

7. A construction method for a single-layer steel shell immersed tunnel with shield tunnel segment lining according to any one of claims 5 to 6, characterized in that, When backfilling the steel shell structure (1) with the covering layer, fine sand is used as the backfill soil.

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