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

Abstract

The application relates to the underwater tunnel immersed tube technology field and provides a concrete lining single-layer steel shell immersed tube and a construction method thereof. The concrete lining single-layer steel shell immersed tube comprises a steel shell structure; the steel shell structure is a single-layer shell; the steel shell structure is in an elliptical section; the long axis of the ellipse is arranged in the horizontal direction; and the inner side of the steel shell structure is poured with a concrete lining. The concrete lining single-layer steel shell immersed tube and the construction method thereof can reduce the draught of the concrete lining single-layer steel shell immersed tube during floating, thereby reducing the demand for the water depth of the floating channel, saving the construction cost and reducing the damage to the tunnel site environment.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater tunnel immersed tubes, in particular to a concrete-lined single-layer steel shell immersed tube and a construction method thereof. Background Art

[0002] In current immersed tube tunnel construction projects at home and abroad, the main types of immersed tube structures are double-layer steel shell immersed tube structures and reinforced concrete immersed tube structures. The main structures of these two types of immersed tubes are cast with self-compacting concrete and need to be prefabricated in a special prefabricated dry dock or factory before being floated to the tunnel site; however, the immersed tube structure after casting with self-compacting concrete has a large deadweight. The existing immersed tube draft can usually reach 8 to 9 meters, and it also needs to be floated to the tunnel site through a special floating channel during transportation.

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

[0004] The purpose of the present invention is to solve the problems of existing immersed tube technology, such as excessive weight during floating, the need to excavate a special floating channel during transportation, which leads to high construction costs, long construction period and great damage to the environment. A single-layer steel shell immersed tube with concrete lining and its construction method are provided.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A concrete-lined single-layer steel shell immersed tube comprises 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 arranged in the horizontal direction; and a concrete lining is cast on the inner side of 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 expected lanes and other ancillary facilities such as crash barriers. In addition to the cross-sectional shape and concrete lining, the remaining structures of the steel shell structure should conform to the general immersed tube design, such as having sufficient structural strength to withstand water pressure, having a sufficient anti-buoyancy coefficient, and having waterstops and connection structures at the ends.

[0008] The internal reinforcement and concrete type of the concrete lining can be referred to the existing immersed tube design specifications.

[0009] Compared with the existing double-layer steel shell structure immersed tube, this scheme has only a single-layer steel shell structure and does not have a large number of steel compartments between the two layers of the steel shell structure of the double-layer steel shell structure immersed tube. Therefore, the casting process requirements for concrete lining are not high, and there is no need for prefabrication in a special prefabricated dry dock or factory on land. In addition, an elliptical shape is used as the cross-section of the steel shell structure. Compared with other polygonal cross-sections, the elliptical cross-section has a more reasonable force distribution and can effectively reduce stress concentration. While ensuring that this scheme has sufficient structural strength to better withstand traffic loads and seismic impact loads, it does not cause structural complexity by thickening or gradually changing the angle of stress concentration parts such as chamfers, as in the scheme using polygonal cross-sections.

[0010] In summary, this solution has a simple structure and does not require high requirements for the casting process. The casting of the concrete lining does not require a dedicated prefabricated dry dock or factory, which makes it convenient to arrange the casting of the concrete lining after floating, thereby reducing the deadweight of this solution during floating and reducing the draft depth. In turn, it can reduce the requirements for the depth of the floating channel, and there is no need to excavate a dedicated floating channel, thereby reducing construction costs and shortening the construction period. At the same time, it can also reduce environmental damage around the tunnel site and reduce the impact of the steel shell structure transportation process on other navigation along the line.

[0011] At the same time, since this solution does not have high requirements for the casting process, there is no need to use expensive self-compacting concrete, thereby reducing the cost of this solution; and compared with the double-layer steel shell immersed tube structure, this solution uses less steel and has a simpler structure, which can significantly reduce the cost of the steel shell structure and shorten the manufacturing period.

[0012] Compared with the scheme with a circular cross-section, the elliptical cross-section of this scheme is closer to the construction boundary of the tunnel, so it has a greater space utilization rate, can relatively reduce the cross-section height, reduce the foundation pit excavation depth and reduce the amount of masonry work, thereby shortening the construction period and saving construction costs.

[0013] As a preferred solution of the present invention, there are at least two steel shell structures; the steel shell structures are arranged side by side; two adjacent steel shell structures are connected by support rods; and the support rods are distributed at intervals along the axial direction of the steel shell structures.

[0014] The spacing and number of steel shell structures should be designed according to the lane requirements of the specific project.

[0015] Under the condition of the same cross-sectional area, this scheme has a lower cross-sectional height compared to the scheme with a single steel shell structure, thereby reducing the excavation depth of the foundation pit and the amount of masonry work, thereby shortening the construction period and saving construction costs.

[0016] The steel shell structures are connected by multiple support rods arranged at intervals along the axial direction of the steel shell structure. On the one hand, the load is more dispersed. By setting the corresponding safety factor, the connection between the steel shell structures can be maintained even if some support rods fail, making this solution more maintainable. On the other hand, if there are other structures between the steel shell structures, the support rods arranged at intervals also facilitate the construction of other structures between the steel shell structures.

[0017] As a preferred solution 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 spaced apart along the height direction of the steel shell structure.

[0018] The height direction of the steel shell structure refers to the direction parallel to the minor axis of the elliptical steel shell structure.

[0019] 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 the waterproof ability.

[0020] The specific number and spacing of the partition structures can be determined according to the specific requirements of the enclosed space. If the space between the partition structures is used as a maintenance passage, the spacing of the partition structures needs to refer to the size of the maintenance equipment and personnel.

[0021] The partition structure distributed at intervals along the vertical direction can serve as the bottom formwork for ballasted concrete, and can also form a closed space between two adjacent steel shell structures to accommodate other equipment or personnel, such as a pipeline channel or maintenance channel; the partition structure can also assist the support rods to connect the adjacent steel shell structures.

[0022] As a preferred solution of the present invention, an external ballast concrete structure is cast on the upper surface of the uppermost diaphragm structure or the lower surface of the lowermost diaphragm structure.

[0023] When the external ballast concrete structure is arranged on the lower surface of the lowest diaphragm structure, the center of gravity of the immersed tube structure can be lowered; when the external ballast concrete structure is arranged on the upper surface of the uppermost diaphragm structure, the pouring of the external ballast concrete structure can be facilitated.

[0024] Since the immersed tube structure requires an anti-buoyancy coefficient of at least 10% after sinking, the thickness of the ballast concrete structure is often large; compared with the existing solution of setting the ballast concrete structure completely inside the immersed tube structure, this solution casts the external ballast concrete structure on the outside of the steel shell structure, which can save the volume inside the immersed tube structure and improve space utilization, thereby relatively reducing the cross-sectional height and the foundation pit excavation depth, reducing the amount of masonry work, and thus shortening the construction period and saving construction costs; and when casting the external ballast concrete structure, this solution can directly use the partition structure and the groove formed by the steel shell structure connected to it on both sides as the concrete template, making the casting operation convenient.

[0025] 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.

[0026] The ventilation channel partition can be a simple flat plate or a curved plate, or a corresponding special-shaped plate for installing other equipment such as lamps and ventilation equipment; the specific size of the ventilation channel formed by the ventilation channel partition corresponds to the ventilation requirements.

[0027] The ventilation channel partition of this solution not only divides the steel shell structure into a dedicated ventilation channel, but also serves as a mounting plate for other top equipment such as lamps. At the same time, this solution can also increase the compressive strength of the steel shell structure.

[0028] As a preferred solution of the present invention, it further comprises a pavement structure; the pavement structure is connected to the concrete lining via pavement columns.

[0029] Pavement structures can serve as carriageways, sidewalks, or a combination of these.

[0030] This solution sets the horizontal pavement structure on the inner wall of the elliptical steel shell structure through pavement columns. The pavement structure can be lifted to the vicinity of the long axis of the elliptical steel shell through the pavement columns to increase space utilization; the space between the pavement structure and the concrete lining can also be used as pipelines or drainage channels.

[0031] As a preferred solution of the present invention, the concrete lining is made of C40 or C50 concrete.

[0032] This solution uses C40 or C50 concrete to cast the concrete lining, which ensures that the concrete lining has sufficient structural strength while reducing the process requirements and costs of the concrete lining and facilitating construction within the steel shell structure.

[0033] A construction method for a concrete-lined single-layer steel shell immersed tube comprises the following steps:

[0034] A. Sinking several steel shell structures to the tunnel site; underwater docking of the steel shell structures;

[0035] B. Draining the underwater steel shell structure; pouring concrete lining inside the steel shell structure.

[0036] When pouring concrete lining, an elliptical formwork corresponding to the size and shape of the concrete lining can be used for pouring; the formwork can be temporarily assembled during pouring, or it can be moved within the steel shell structure to facilitate segmented pouring of the concrete lining.

[0037] Except for arranging the pouring of the concrete lining after the sinking of the steel shell structure, the manufacturing, transportation, docking and backfilling of the concrete-lined single-layer steel shell immersed tube in this scheme can refer to the construction steps of the existing immersed tube structure.

[0038] For example, when manufacturing steel shell structures, a dedicated dry dock or factory can be built on site, or an existing factory can be used; when manufacturing single-layer steel shell immersed tubes with concrete lining, in addition to the steel shell structure, other accessories of the single-layer steel shell immersed tubes with concrete lining or other ancillary equipment required for subsequent steps, such as measuring towers, guy wire columns, and ballast systems, can be installed in the factory at the same time, or they can be installed when needed.

[0039] During floating transportation, temporary sealing doors can be added to both ends of the concrete-lined single-layer steel shell immersed tube to facilitate floating transportation.

[0040] When sinking the steel shell structure, the single-layer steel shell immersed tube with concrete lining used in the tunnel can be sunk all at once before proceeding to the next step of operation, or the next step of operation can be proceeded after each section of the single-layer steel shell immersed tube with concrete lining is sunk.

[0041] When docking, appropriate docking methods should be adopted according to the tunnel site conditions and construction equipment limitations, such as welding, wet joints or mechanical connections.

[0042] When backfilling, the tunnel site conditions and construction equipment limitations can be considered, and existing backfill specifications can be referred to for backfilling.

[0043] After the steel shell structures of each section are connected and drained, the installation and construction of tunnel ancillary equipment or structures, such as carriageways, lamps, and cables, can be carried out.

[0044] Arranging the pouring of the concrete lining, one of the main components of the concrete-lined single-layer steel shell immersed tube, after the steel shell structure is sunk can significantly reduce the weight of the concrete-lined single-layer steel shell immersed tube during transportation, thereby significantly reducing the draft of the concrete-lined single-layer steel shell immersed tube during floating transportation, thereby reducing the water depth requirement for the floating channel and alleviating the environmental damage caused by the floating channel excavation to the surrounding area of ​​the tunnel site and the impact on other navigation along the route;

[0045] Furthermore, since no concrete lining is poured during floating transportation, it is easier to adjust the relationship between the deadweight and volume of the concrete-lined single-layer steel shell immersed tube so that the deadweight and buoyancy reach a critical state of balance. This also reduces the requirements for other equipment, such as the performance of ships, during transportation, mooring positioning, sinking, and docking of the concrete-lined single-layer steel shell immersed tube.

[0046] By first connecting the steel shell structure sections and then pouring the concrete lining, it is avoided that the steel shell structure is deformed due to the pouring of the concrete lining before the connection, which may lead to excessive cross-sectional errors and hinder the connection. That is, this solution can simplify the cross-sectional design of the steel shell structure, facilitate the unification of the cross-sections of the steel shell structure sections and realize the standardization of the steel shell structure and its manufacturing template.

[0047] As a preferred solution of the present invention, when an external ballast concrete structure is provided outside the steel shell structure, the external ballast concrete structure is cast before step A.

[0048] Since the external ballast concrete is arranged outside the steel shell structure, this solution pours the external ballast concrete structure before the steel shell structure is sunk, which can reduce the difficulty of pouring the external ballast concrete structure and avoid underwater construction.

[0049] As a preferred solution of the present invention, the pouring of the concrete lining is carried out in several sections along the length direction of the steel shell structure; the length of each section of the concrete lining is less than or equal to seventeen meters.

[0050] Compared with the integral casting method of the second-generation reinforced concrete immersed tube structure, this scheme casts the concrete lining in sections. It has better heat dissipation conditions and can reduce the hydration heat peak, thereby preventing the concrete from hydrating excessively and causing temperature cracks, and improving the casting quality. At the same time, segmented casting is also beneficial to reducing the length of the formwork used for casting, thereby facilitating the assembly or movement of the formwork inside the steel box.

[0051] As a preferred solution of the present invention, the concrete lining is cast through an elliptical template; a walking device is provided between the elliptical template and the steel shell structure; the elliptical template can be moved along the axis of the steel shell structure by the walking device.

[0052] The specific structure of the elliptical formwork can refer to the existing immersed tube formwork design process and be designed as a detachable formwork or a retractable formwork.

[0053] This solution can facilitate the transfer operation of the formwork to the position of the next concrete lining segment after pouring one concrete lining segment, thereby improving construction efficiency and reducing labor.

[0054] As a preferred solution of the present invention, fine sand backfill soil is used when backfilling the cover layer of the steel shell structure.

[0055] This solution uses fine sand backfill soil for backfilling the cover layer. The backfill soil can fit more closely to the outer surface of the steel shell structure, thereby providing good support for the steel shell structure.

[0056] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0057] 1. The concrete-lined single-layer steel shell immersed tube of the present invention has a single-layer steel shell structure and an elliptical cross-section. Compared with solutions with polygonal cross-sections or double-layer steel shell structure immersed tube solutions, the structure is simpler and has lower requirements for the pouring process of the concrete lining. Pouring does not require a dedicated prefabricated dry dock or factory on land. By arranging the pouring step after floating, the draft depth can be reduced, thereby reducing the requirements for the depth of the floating channel.

[0058] 2. Compared with the existing double-layer steel shell structure immersed tube, the concrete-lined single-layer steel shell immersed tube of the present invention uses less steel and has a simpler structure, which can significantly reduce the cost of the steel shell structure and shorten the manufacturing period.

[0059] 3. The elliptical cross-section steel shell structure of the present invention is closer to the building boundary of the tunnel than a circular one, thus having a greater space utilization rate, can relatively reduce the cross-section height, and thus reduce the foundation trench excavation depth and the amount of masonry work, thereby shortening the construction period and saving construction costs.

[0060] 4. The construction method of the present invention adopts the sequence of floating the steel shell structure and sinking it to the bottom before pouring the concrete lining. This can significantly reduce the deadweight of the concrete-lined single-layer steel shell immersed tube during floating, thereby reducing the draft of the concrete-lined single-layer steel shell immersed tube during floating, reducing the demand for the water depth of the floating channel, and thus saving construction costs and shortening the construction period.

[0061] 5. The construction method of the present invention adopts the sequence of pouring the concrete lining after the underwater multi-section steel shell structure is completed. The deformation of the steel shell structure before the docking is small, which can avoid the situation where the steel shell structure undergoes excessive deformation due to pouring the concrete lining before docking, which may lead to docking difficulties or even failure. Therefore, this solution can simplify the cross-sectional design of the steel shell structure, facilitate the unification of the cross-section of each section of the steel shell structure, and realize the standardization of the steel shell structure and its manufacturing template.

[0062] 6. The construction method of the present invention does not require pouring concrete lining before the steel shell structure is floated and sunk to the bottom. Existing steel processing plants, such as shipyards, can be directly used for manufacturing the steel shell structure, which reduces manufacturing difficulty and avoids the need to build a temporary dry dock or factory at the tunnel site, thereby reducing the environmental impact of the manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 3D schematic diagram of the concrete-lined single-layer steel shell immersed tube of Example 1;

[0064] Figure 2 is a schematic cross-sectional view of a concrete-lined single-layer steel shell immersed tube of Example 1;

[0065] Figure 3 is a schematic diagram of the three-dimensional structure of a concrete-lined single-layer steel shell immersed tube of Example 2;

[0066] Figure 4 is a schematic cross-sectional view of a concrete-lined single-layer steel shell immersed tube of Example 2;

[0067] Icons: 1-Steel shell structure; 2-Concrete lining; 3-Support rod; 4-External ballast concrete structure; 5-Partition structure; 6-Pavement structure; 7-Pavement column; 8-Crash pier; 11-Ventilation channel partition. DETAILED DESCRIPTION

[0068] The present invention will be described in detail below with reference to the accompanying drawings.

[0069] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present 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 only used to explain the present invention and are not intended to limit the present invention.

[0070] Example 1

[0071] like Figure 1 and Figure 2 As shown, the present invention adopts a concrete-lined single-layer steel shell immersed tube, which includes a steel shell structure 1 and a concrete lining 2 cast on the inner wall thereof. For this embodiment, the concrete lining 2 is cast using C40 or C50 concrete.

[0072] The steel shell structure 1 is also provided with PC cables, end plates and waterproof tapes provided on the end plates at both ends for docking operations.

[0073] It should be noted that the PC cables in this embodiment are a method of connecting the sections of concrete-lined single-layer steel shell immersed tubes in order to simplify the process. Depending on the needs and scenarios, other connection methods such as welding connections or cast-in-place concrete joints can also be used.

[0074] Example 2

[0075] like Figure 3 and Figure 4 As shown, on the basis of Example 1, the present invention adopts a concrete-lined single-layer steel shell immersed tube, and the number of steel shell structures 11 is increased to two, and they are arranged side by side along the long axis direction 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 the upper and lower ends of the steel shell structure 11.

[0076] A partition structure 55 is further provided between two adjacent steel shell structures 11 ; in this embodiment, the partition structure 55 is a plate parallel to the horizontal plane, and there are two of them. The passage between the two partition structures 55 serves as an inspection passage.

[0077] It should be noted that the present embodiment includes two steel shell structures 11 corresponding to the lanes in two directions. If the lanes have different requirements for installation space, the number of steel shell structures 11 can be increased or decreased.

[0078] Example 3

[0079] like Figures 1 to 4 As shown, on the basis of embodiments 1 and 2, a ventilation channel partition 11 is further provided inside the steel shell structure 1;

[0080] In this embodiment, the ventilation channel partition 11 is a horizontal plate arranged in the upper half of the steel shell structure 1, and the channel formed between the ventilation channel and the inner side of the steel shell structure 1 is used for ventilation.

[0081] Example 4

[0082] like Figures 1 to 4 As shown, based on Examples 1 to 3, a pavement structure 6 serving as a driving lane is further included; the pavement structure 6 is connected to the inner surface of the concrete lining 2 via pavement columns 7. Crash barriers 8 are also provided at both ends of the pavement structure 6; a gap is provided between the crash barriers 8 and the pavement structure 6 to guide water flow into the underside of the pavement structure 6.

[0083] This embodiment is a specific solution for installing a driving lane in a single-layer steel shell immersed tube lined with concrete.

[0084] Example 5

[0085] like Figures 1 to 4 As shown, the construction method of a concrete-lined single-layer steel shell immersed tube used in any one of Examples 1 to 4 adopted by the present invention comprises the following steps:

[0086] S1. Make the steel shell structure 1 of a concrete-lined single-layer steel shell immersed tube; when the concrete-lined single-layer steel shell immersed tube includes a plurality of elliptical steel shell structures 1, the support rods 3 and the partition structure 5 connecting two adjacent steel shell structures 1 are also made together, and since the groove formed by the partition structure 5 and the steel shell structures 1 connected on both sides thereof can be directly used as a template for the external ballast concrete structure 4, the external ballast concrete structure 4 can also be cast in this step to avoid underwater operations.

[0087] Other devices that need to be installed on the steel shell structure 1 during the construction process, such as a measuring tower, can be installed together in this step, or can be installed on site when needed.

[0088] S2, floating steel shell structure 1 to the tunnel site;

[0089] In this embodiment, temporary sealing doors are installed at both ends of the steel shell structure 1 during floating transportation so as to make the steel shell structure 1 float on the water surface.

[0090] S3, mooring and positioning the steel shell structure 1; after positioning, water is injected into the steel shell structure 1 to make it sink;

[0091] After being transported to the designated location, it can be positioned with the assistance of other equipment or vehicles, such as using anchor blocks and cables for twisting and positioning; for sinking, this embodiment installs a water tank in the steel shell structure 1 and fills the water tank with water to sink the steel shell structure 1 to the predetermined position.

[0092] S4, repeat steps S2 to S3 until there are at least two sections of steel shell structure 1 underwater;

[0093] In this embodiment, after the first section of the steel shell structure 1 is sunk into the water and put into place, the subsequent steps are directly executed after each section of the steel shell structure 1 is sunk into the water to reduce the waiting time.

[0094] S5, underwater docking steel shell structure 1;

[0095] In this embodiment, a pulling jack is used to pull the two adjacent sections of the steel shell structure 1 closer to each other until the waterproof belts on the end plates are squeezed and closed; after the PC cables at corresponding positions of the two adjacent sections of the steel shell structure 1 are connected, the pulling jack pressure is released and the pulling jack is removed; finally, the PC cables are subjected to anti-corrosion treatment to complete the docking.

[0096] S6. Backfilling the steel shell structure 1 with a covering layer;

[0097] The backfilling of the covering layer can refer to the existing technical solutions. First, locking backfill is performed on both sides of the steel shell structure 1 to lock the position of the steel shell structure 1, and then general backfill is performed on the bottom of the steel shell structure 1 to ensure uniform force on the bottom of the steel shell structure 1; 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 is backfilled to protect the steel shell structure 1 from the outside.

[0098] In this embodiment, fine sand is used as backfill soil so that the backfill soil can better fit the outer wall of the concrete-lined single-layer steel shell immersed tube of this solution.

[0099] S7, draining the interconnected steel shell structures 1;

[0100] S8. Set an elliptical formwork in the steel shell structure 1 and pour concrete between the steel shell structure 1 and the elliptical formwork; before pouring, apply a release agent on the outer surface of the elliptical formwork to prevent the concrete lining 2 and the elliptical formwork from adhering to each other. C40 or C50 concrete can be used for pouring concrete.

[0101] For this embodiment, the elliptical formwork is a retractable formwork, and the parts at both ends of its elliptical shell are hinged to the upper part of its elliptical shell. When pouring, the parts at both ends of the elliptical shell rotate in the direction away from the center of the elliptical formwork, thereby forming a complete elliptical shell together with the other parts of the elliptical formwork as an inner mold for concrete pouring; when pouring is completed, the parts at both ends of the elliptical shell rotate toward the center of the elliptical formwork, thereby disengaging from the poured concrete lining 2; and the lower part of the elliptical formwork is provided with a formwork support and a walking device, which is convenient for fixing the elliptical formwork in the correct position inside the steel shell structure 1 and moving it when the next section of concrete lining 2 needs to be poured; the length of the elliptical formwork is less than or equal to seventeen meters to avoid the excessively long elliptical formwork from hindering the pouring of concrete.

[0102] After the poured concrete solidifies and forms the concrete lining 2, the elliptical formwork is moved along the axis of the steel shell structure 1 toward the direction where there is no concrete lining 2 and the next section of concrete lining 2 is poured until the concrete lining 2 in all the steel shell structures 1 is poured.

[0103] After step S8 is completed, the interior of the concrete-lined single-layer steel shell immersed tube can be decorated and the construction of the concrete-lined single-layer steel shell immersed tube can be completed according to the specific project requirements. For example, the pavement structure 6 and the pavement column 7 can be installed for the concrete-lined single-layer steel shell immersed tube that needs to be opened to traffic, and the ventilation channel partition 11 can be installed for the steel shell immersed tube structure that needs ventilation.

[0104] The above are only 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 in the scope of protection of the present invention.

Claims

1. A concrete-lined single-layer steel shell immersed tube, 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 long axis of the ellipse is arranged in the horizontal direction; the inner side of the steel shell structure (1) is cast with a concrete lining (2); There are at least two steel shell structures (1); the steel shell structures (1) are arranged side by side; two adjacent steel shell structures (1) are connected via support rods (3); the support rods (3) are distributed at intervals along the axial direction of the steel shell structures (1); A partition structure (5) is further connected between two adjacent steel shell structures (1); the partition structure (5) is of the same length as the steel shell structure (1); there are at least two partition structures (5) and they are spaced apart along the height direction of the steel shell structure (1); the passage between the two partition structures (5) serves as an inspection passage; and an external ballast concrete structure (4) is cast on the upper surface of the uppermost partition structure (5) or the lower surface of the lowermost partition structure (5).

2. The concrete-lined single-layer steel shell immersed tube according to claim 1, characterized in that: The concrete lining (2) is made of C40 or C50 concrete.

3. A construction method for a concrete-lined single-layer steel shell immersed tube, applied to a concrete-lined single-layer steel shell immersed tube as claimed in any one of claims 1 to 2, characterized in that: The following steps are involved: A. sinking a plurality of steel shell structures (1) to the tunnel site; and docking the steel shell structures (1) underwater; B. Draining the underwater steel shell structure (1); pouring a concrete lining (2) inside the steel shell structure (1).

4. The construction method of a concrete-lined single-layer steel shell immersed tube according to claim 3, 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.

5. The construction method of a concrete-lined single-layer steel shell immersed tube according to claim 3, characterized in that: The pouring of the concrete lining (2) is carried out in several sections along the length direction of the steel shell structure (1); the length of each section of the concrete lining (2) is less than or equal to seventeen meters.

6. The construction method of a concrete-lined single-layer steel shell immersed tube according to claim 3, characterized in that: The concrete lining (2) is cast through an elliptical formwork; a walking device is provided between the elliptical formwork and the steel shell structure (1); the elliptical formwork can be moved along the axis of the steel shell structure (1) through the walking device.

7. The construction method of a concrete-lined single-layer steel shell immersed tube according to claim 3, characterized in that: When backfilling the steel shell structure (1) with a covering layer, fine sand backfill soil is used.

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