An assembled double-steel-plate concrete composite pipeline and construction method

Abstract

The present invention discloses an assembled double-steel plate concrete composite pipeline and a construction method. The composite pipeline is composed of a plurality of double-steel plate concrete segment units along the circumferential direction. Adjacent segment units are connected and fastened by circumferential nodes. The pipeline is prefabricated in sections along the length direction, and adjacent sections are connected and fastened by vertical nodes. The double-steel plate concrete segment unit includes a segment unit shell and an interlayer concrete cast in the shell. The segment unit shell is welded by an arc-shaped outer steel plate, an arc-shaped inner steel plate and a Z-shaped side plate. The Z-shaped side plate is provided with an embedded bolt group. The present invention adopts a double-steel plate concrete composite structure to give full play to the advantages of steel in tension and concrete in compression, improve the overall rigidity and crack resistance of the pipeline, the steel plate acts as a template for pouring concrete, the inner wall of the pipeline is smooth, and the water flow capacity is strong. The segment units are connected by bolts or welding, the construction is simple, the connection is reliable, and it has broad engineering application prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of water pipelines, and relates to a large water pipeline for a pumped storage power station, and in particular to an assembled double-steel plate concrete composite pipeline and a construction method. Background Art

[0002] Water pipelines are key components in pumped-storage power plants, enabling them to pump water from upper and lower reservoirs for energy storage and release it for power generation. They are crucial to the proper functioning of pumped-storage systems. With the increasing adoption of large-megawatt pumped-storage power plants, higher performance requirements are being placed on water pipelines.

[0003] At present, the water supply pipelines in pumped storage power stations are mainly reinforced concrete pipes. Reinforced concrete pipes have high rigidity, low price and mature manufacturing technology. However, they have problems such as heavy weight, rough inner wall, easy to produce circumferential cracks, etc. In addition, the construction period is too long and the quality is often defective, which greatly restricts the promotion and application of reinforced concrete pipes. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an assembled double-steel plate concrete composite pipe and a construction method to improve the overall rigidity and crack resistance of the pipe and improve construction efficiency.

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

[0006] A prefabricated double-steel plate concrete composite pipe, the composite pipe consisting of a plurality of prefabricated pipe sections along the length direction, adjacent prefabricated pipe sections being connected by vertical nodes; each prefabricated pipe section consisting of a plurality of double-steel plate concrete segment units along the circumferential direction, adjacent double-steel plate concrete segment units being connected by circumferential nodes; the double-steel plate concrete segment units comprising a segment unit shell and sandwich concrete cast within the segment unit shell; the segment unit shell being welded together by an arc-shaped outer steel plate, an arc-shaped inner steel plate and Z-shaped side plates on both sides; the radial cross-sectional length of the arc-shaped outer steel plate being smaller than the radial cross-sectional length of the arc-shaped inner steel plate.

[0007] In one embodiment, the sandwich concrete is cast in a precast or cast-in-place manner, and the sandwich concrete is ordinary concrete, recycled concrete, self-compacting concrete, RPC or UHPC.

[0008] In one embodiment, each of the Z-shaped side panels is welded together by a first side panel, a second side panel, and a third side panel, and the radial cross-sectional length of the Z-shaped side panel is equal to the thickness of the double-steel-plate concrete segment unit; wherein, the first side panel is connected to the arc-shaped inner steel plate, the third side panel is connected to the arc-shaped outer steel plate, and the second side panel is connected to the first side panel and the third side panel, forming a Z shape in the radial cross-section.

[0009] In one embodiment, radial embedded bolt groups are provided on the second side plate, each of the embedded bolt groups is composed of 2 or 4 high-strength bolts, and the embedded bolt groups are arranged at equal intervals along the length direction of the combined pipe. Along the length direction, the embedded bolt groups are composed of a first embedded bolt group located at both ends and a second embedded bolt group located in the middle.

[0010] In one embodiment, the circumferential node includes a circumferential connecting plate, a straight rib plate, and a second mounting nut; the second side plates of the circumferentially adjacent double-steel plate concrete segment units are connected via the circumferential connecting plate and the second embedded bolt group, and are fixed with the second mounting nut; the straight rib plate is welded to the middle position of the circumferential connecting plate along the circumferential direction;

[0011] The vertical node includes a vertical connecting plate, a cross-shaped rib plate and a first mounting nut; the second side plate of the axially adjacent double steel plate concrete segment unit is connected to the first embedded bolt group through the vertical connecting plate and fixed with the first mounting nut; the cross-shaped rib plate is welded to the middle position of the vertical connecting plate.

[0012] In one embodiment, a filling material is provided on the outer side of the second side plate, the filling material covers the annular nodes and the vertical nodes and makes the outer wall of the combined pipe smooth, and the filling material is high-strength grouting material, UHPC or ECC.

[0013] In one embodiment, the curvature of the arc-shaped outer steel plate is smaller than that of the arc-shaped inner steel plate, and the curvature difference is determined according to the preset width of the Z-shaped side plate; the length difference between the cross-sectional length of the arc-shaped outer steel plate and the cross-sectional length of the arc-shaped inner steel plate is determined according to the preset width of the filling material.

[0014] In one embodiment, adjacent double-steel plate concrete segment units are welded circumferentially into double-steel plate concrete segments, and adjacent segments are welded longitudinally into double-steel plate concrete pipes, and filling materials are poured after connecting the nodes.

[0015] The present invention also provides a construction method for the assembled double-steel plate concrete composite pipeline, comprising:

[0016] 1) Processing Z-shaped side panels, curved outer steel plates and curved inner steel plates;

[0017] 2) Weld the Z-shaped side plates, curved outer steel plates, and curved inner steel plates into the segment unit shell, pour interlayer concrete inside the segment unit shell, and complete the double steel plate concrete segment unit processing;

[0018] 3) The double steel plate concrete segment unit is transported to the site, and several prefabricated pipe sections are obtained using the annular nodes. The prefabricated pipe sections are connected through vertical nodes along the length direction to obtain a double steel plate concrete composite pipe.

[0019] In one embodiment, the Z-shaped side panel is formed by welding a first side panel, a second side panel, and a third side panel in sequence. An embedded bolt group is installed along the length direction of the second side panel. The embedded bolt group consists of a first embedded bolt group located at both ends and a second embedded bolt group located in the middle.

[0020] The annular node includes an annular connecting plate, and the annular connecting plate is processed with a reserved hole corresponding to the position of the first embedded bolt group;

[0021] The vertical node includes a vertical connecting plate, and a reserved hole corresponding to the position of the second embedded bolt group is processed on the vertical connecting plate;

[0022] On site, the second side plates of the circumferentially adjacent double-steel plate concrete segment units are connected by the circumferential connecting plate and the second embedded bolt group to achieve circumferential connection, and the second side plates of the axially adjacent double-steel plate concrete segment units are connected by the vertical connecting plate and the first embedded bolt group to achieve axial connection.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) Convenient construction

[0025] The double-steel-plate concrete composite pipeline is prefabricated in segments along the circumference and length. Segment units are bolted or welded, ensuring convenient installation and reliable connections. The curved outer and inner steel plates, along with Z-shaped side panels, are welded together to form the segment shell, serving as a formwork for pouring concrete. This shortens the construction period and improves efficiency. All components are prefabricated in the factory and assembled on-site, significantly enhancing construction performance.

[0026] 2) Improved mechanical properties

[0027] Double-steel-plate concrete composite pipes utilize a steel-plate concrete structure, enhancing the pipe's overall rigidity and crack resistance. The inner and outer steel plates constrain the concrete sandwich, preventing buckling. Studs are welded to the inner and outer steel plates to enhance interoperability with the concrete. Compared to traditional reinforced concrete pipes, the pipes offer a smoother interior and greater water flow capacity. Joints are bolted or welded, and high-strength grouting is then applied to enhance waterproofing.

[0028] 3) Low cost

[0029] Double steel plate concrete composite pipes give full play to the strength of the material. Compared with traditional reinforced concrete pipes, the pipe segment wall thickness is smaller, the structure weight is lighter, the material consumption is reduced, transportation and lifting are convenient, the project cost is reduced, and good economic benefits are achieved.

[0030] Generally speaking, the double steel plate concrete composite pipeline adopts a steel plate concrete structure, which gives full play to the advantages of steel in tension and concrete in compression, improves the overall stiffness and crack resistance of the pipeline, and the steel plate acts as a template for pouring concrete. The inner wall of the pipeline is smooth and has a strong water flow capacity. The pipe segment units are connected by bolts or welding, which is simple to construct and has reliable connections. All components are prefabricated in the factory and assembled on site, which significantly improves construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is an overall schematic diagram of the double steel plate concrete composite pipeline of the present invention.

[0032] Figure 2 It is an overall schematic diagram of the double steel plate concrete composite segment unit of the present invention.

[0033] Figure 3 This is a diagram of the internal structure of the double steel plate concrete composite segment unit of the present invention.

[0034] Figure 4 It is an overall schematic diagram of the ring node of the present invention.

[0035] Figure 5 It is an overall schematic diagram of the vertical node of the present invention.

[0036] Figure 6 It is an overall schematic diagram of the second double steel plate concrete composite pipe connection method of the present invention.

[0037] Icons: 1-double steel plate concrete segment unit; 2-circumferential node; 3-vertical node; 4-segment unit shell; 5-sandwich concrete; 61-first embedded bolt group; 62-second embedded bolt group; 7-arc-shaped outer steel plate; 8-arc-shaped inner steel plate; 9-Z-shaped side plate; 10-stud; 11-first side plate; 12-second side plate; 13-third side plate; 14-circumferential connecting plate; 15-I-shaped rib; 16-cross rib; 171-first mounting nut; 172-second mounting nut; 18-vertical connecting plate; 19-filling material. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0041] In the description of this application, it should be noted that the terms "upper" and "lower" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product is usually placed when in use. These are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0042] As mentioned above, the water pipelines in existing pumped-storage power plants are primarily reinforced concrete pipes. These pipes are heavy and have rough inner surfaces, which can easily develop circumferential cracks over time. Furthermore, traditional reinforced concrete pipes have a long construction cycle, which can hinder the overall project progress.

[0043] To this end, the present invention provides an assembled double steel plate concrete composite pipeline, such as Figure 1 As shown, it is composed of several prefabricated pipe segments connected in sequence along the length direction. Specifically, adjacent prefabricated pipe segments can be connected through vertical nodes 3. Each prefabricated pipe segment is composed of multiple double-steel plate concrete segment units 1 along the circumference direction. Specifically, adjacent double-steel plate concrete segment units 1 are connected through circumferential nodes 2.

[0044] The double steel plate concrete segment unit 1 is the basic unit component of the present invention. Figure 2 and Figure 3 As shown, it primarily comprises a segmental unit shell 4 and a sandwich concrete layer 5 cast within the shell. The segmental unit shell 4 is a welded structure consisting of a curved outer steel plate 7, a curved inner steel plate 8, and two Z-shaped side plates 9. In this structure, the radial cross-sectional length of the curved outer steel plate 7 is smaller than that of the curved inner steel plate 8. In other words, from the inside out, the radial cross-sectional length of the segmental unit shell 4 is convex.

[0045] The present invention uses a segment unit shell 4 formed by an arc-shaped outer steel plate 7, an arc-shaped inner steel plate 8, and a Z-shaped side plate 9 to enclose the sandwich concrete 5, thereby suppressing the cracking of the sandwich concrete 5 and preventing the arc-shaped outer steel plate 7 and the arc-shaped inner steel plate 8 from becoming unstable. Since the present invention adopts a double steel plate concrete composite structure, it can give full play to the advantages of steel being tensile and concrete being compressive, thereby improving the overall rigidity and crack resistance of the pipeline. The arc-shaped outer steel plate 7 and the arc-shaped inner steel plate 8 act as a template for pouring concrete, and the inner wall of the pipeline is smooth and has a strong water flow capacity. The double steel plate concrete segment unit 1 is connected by bolts or welding, which is simple to construct and reliable in connection. In addition, all components can be prefabricated in the factory and assembled on site, which significantly improves construction efficiency and has broad engineering application prospects. The present invention can be widely used in the construction of pumped storage power stations and can also be expanded to other fields, such as energy transportation pipelines such as oil and natural gas.

[0046] In an embodiment of the present invention, the sandwich concrete 5 can be cast in a prefabricated or cast-in-place manner, and the sandwich concrete 5 can be ordinary concrete, recycled concrete, self-compacting concrete, RPC or UHPC, to meet the different requirements of actual projects for concrete performance. The casting method is selected according to the actual project pipeline's deadweight to improve transportation efficiency.

[0047] In the embodiment of the present invention, each Z-shaped side panel 9 is welded together by a first side panel 11, a second side panel 12, and a third side panel 13. The radial cross-sectional length of the Z-shaped side panel 9 is equal to the thickness of the double-steel-plate concrete segment unit 1. The first side panel 11 is connected to the curved inner steel panel 8, the third side panel 13 is connected to the curved outer steel panel 7, and the second side panel 12 connects the first and third side panels 11, 13, forming a Z-shape in the radial cross-section.

[0048] In this embodiment, the first side plate 11 and the third side plate 13 can be straight plates in the radial direction, while the second side plate 12 can be an arc-shaped plate arranged in the circumferential direction. The radial cross-sectional length of the Z-shaped side plate 9 refers to the distance from the outermost end of the third side plate 13 to the innermost end of the first side plate 11. In the present invention, "inside" and "outside" are defined with reference to the center of the pipeline. Thus, the innermost end of the first side plate 11 is connected to the outer side of the circumferential end of the arc-shaped inner steel plate 8, and the outermost end of the third side plate 13 is connected to the inner side of the circumferential end of the arc-shaped outer steel plate 7. The use of the Z-shaped side plate 9 can make the arc-shaped inner steel plate 8 spliced into a circular inner wall, ensuring the anti-seepage and anti-leakage performance of the pipeline. The arc-shaped outer steel plate 7 reserves the bolt connection node position, and the Z-shaped side plate 9 connects the inner and outer steel plates to form a pipe segment unit shell, ensuring that the shell is subjected to common force.

[0049] In this embodiment of the present invention, radially arranged embedded bolt groups are provided on the second side plate 12. Each embedded bolt group can be composed of two or four high-strength bolts, and the embedded bolt groups are evenly spaced along the length of the composite pipe. For ease of presentation, in this embodiment, the embedded bolt groups are divided into first embedded bolt groups 61 at both ends and second embedded bolt groups 62 located between the first embedded bolt groups 61 at both ends.

[0050] In this embodiment, the main function of the embedded bolt group is to realize the specific connection structure of the circumferential node 2 and the vertical node 3. The bolt assembly can be completed on site, which is efficient and convenient.

[0051] In this embodiment of the present invention, the circumferential node 2 includes an annular connecting plate 14, a straight rib 15, and a second mounting nut 172. The second side plates 12 of adjacent circumferentially adjacent double-steel plate concrete segment units 1 are connected via the annular connecting plate 14 and the second embedded bolt assembly 62 and secured with the second mounting nut 172. The straight rib 15 is circumferentially welded to the center of the annular connecting plate 14.

[0052] The vertical node 3 includes a vertical connecting plate 18, a cross-shaped rib 16 and a first mounting nut 171; the second side plates 12 of the axially adjacent double steel plate concrete segment units 1 are connected through the vertical connecting plate 18 and the first embedded bolt group 61, and fixed with the first mounting nut 171; the cross-shaped rib 16 is welded to the middle position of the vertical connecting plate 18.

[0053] In an embodiment of the present invention, a filling material 19 is provided on the outer side of the second side plate 12. The filling material 19 covers the annular node 2 and the vertical node 3 and makes the outer wall of the combined pipe smooth. The filling material 19 is a high-strength grouting material, UHPC or ECC.

[0054] In this embodiment, by using the filling material 19, on the one hand, the outer wall of the combined pipe can be made smooth, and on the other hand, the waterproof performance of the node can be improved.

[0055] In an embodiment of the present invention, the curvature of the arc-shaped outer steel plate 7 is smaller than that of the arc-shaped inner steel plate 8, and the curvature difference is determined according to the preset width of the Z-shaped side plate 9; the length difference between the cross-sectional length of the arc-shaped outer steel plate 7 and the cross-sectional length of the arc-shaped inner steel plate 8 is determined according to the preset width of the filling material 19.

[0056] In the embodiment of the present invention, studs 10 are arranged on the inner side of the arc-shaped outer steel plate 7 and the outer side of the arc-shaped inner steel plate 8 . The studs 10 can be arranged in a square or a plum blossom shape.

[0057] In this embodiment, the arranged studs 10 can make the connection between the segment unit shell 4 and the sandwich concrete 5 tighter, thereby improving the integrity and bearing capacity of the double steel plate concrete segment unit 1.

[0058] In an embodiment of the present invention, the double-steel plate concrete segment unit 1 may also not be provided with the first embedded bolt group 61 and the second embedded bolt group 62. Adjacent double-steel plate concrete segment units 1 are directly welded into double-steel plate concrete pipe sections along the circumferential direction, and adjacent pipe sections are directly welded into double-steel plate concrete pipes along the length direction, and the filling material 19 is poured after the connection nodes.

[0059] The construction method of the assembled double-steel plate concrete composite pipeline of the present invention comprises:

[0060] 1. Complete the reserved holes on the second side plate 12, weld it into a Z-shaped side plate 9, and install the first embedded bolt group 61 and the second embedded bolt group 62; bend the steel plate into an arc-shaped outer steel plate 7 and an arc-shaped inner steel plate 8, and weld the studs 10 on the inside of the arc-shaped outer steel plate 7 and the outside of the arc-shaped inner steel plate 8; complete the reserved holes on the annular connecting plate 14 and the vertical connecting plate 18, and weld the cross rib 16 and the straight rib 15 respectively;

[0061] 2. Weld the Z-shaped side plate 9, the arc-shaped outer steel plate 7 and the arc-shaped inner steel plate 8 into the segment unit shell 4, pour the sandwich concrete 5 in the segment unit shell 4, and complete the processing of the double steel plate concrete segment unit 1.

[0062] 3. Transport the double-steel plate concrete segment unit 1 to the site, splice the annular nodes 2 and pour the filling material 19 to obtain a double-steel plate concrete pipe section. Repeat the above splicing operation to obtain several double-steel plate concrete pipe sections, connect them through the vertical nodes 3 along the length direction and pour the filling material 19 to obtain a double-steel plate concrete composite pipe.

[0063] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An assembled double steel plate concrete composite pipeline, characterized in that: The combined pipe is composed of a plurality of prefabricated pipe sections along the length direction, and adjacent prefabricated pipe sections are connected by vertical nodes (3); each prefabricated pipe section is composed of a plurality of double-steel plate concrete pipe segment units (1) along the circumferential direction, and adjacent double-steel plate concrete pipe segment units (1) are connected by circumferential nodes (2); the double-steel plate concrete pipe segment unit (1) comprises a pipe segment unit shell (4) and a sandwich concrete (5) cast in the pipe segment unit shell (4); the pipe segment unit shell (4) is welded by an arc-shaped outer steel plate (7), an arc-shaped inner steel plate (8) and Z-shaped side plates (9) on both sides; the radial cross-sectional length of the arc-shaped outer steel plate (7) is smaller than the radial cross-sectional length of the arc-shaped inner steel plate (8); Each of the Z-shaped side plates (9) is welded together by a first side plate (11), a second side plate (12) and a third side plate (13), and the radial cross-sectional length of the Z-shaped side plate (9) is equal to the thickness of the double-steel plate concrete segment unit (1); wherein the first side plate (11) is connected to the arc-shaped inner steel plate (8), the third side plate (13) is connected to the arc-shaped outer steel plate (7), and the second side plate (12) is connected to the first side plate (11) and the third side plate (13), forming a Z shape in the radial cross-sectional area; The second side plate (12) is provided with radial embedded bolt groups, each of which is composed of two or four high-strength bolts, and each embedded bolt group is arranged at equal intervals along the length direction of the combined pipe. Along the length direction, the embedded bolt group is composed of a first embedded bolt group (61) located at both ends and a second embedded bolt group (62) located in the middle. The annular node (2) comprises an annular connecting plate (14), a straight rib plate (15) and a second mounting nut (172); the second side plate (12) of the annular adjacent double steel plate concrete segment unit (1) is connected via the annular connecting plate (14) and the second embedded bolt group (62), and is fixed with the second mounting nut (172); the straight rib plate (15) is welded to the middle position of the annular connecting plate (14) along the annular direction; The vertical node (3) comprises a vertical connecting plate (18), a cross-shaped rib plate (16) and a first mounting nut (171); the second side plates (12) of the axially adjacent double-steel plate concrete segment units (1) are connected via the vertical connecting plate (18) and the first embedded bolt group (61), and are fixed with the first mounting nut (171); the cross-shaped rib plate (16) is welded to the middle position of the vertical connecting plate (18).

2. The assembled double steel plate concrete composite pipeline according to claim 1 is characterized in that: The sandwich concrete (5) is cast in a prefabricated or cast-in-place manner, and the sandwich concrete (5) is ordinary concrete, recycled concrete, self-compacting concrete, RPC or UHPC.

3. The assembled double steel plate concrete composite pipeline according to claim 1, characterized in that: A filling material (19) is provided on the outer side of the second side plate (12), the filling material (19) covers the annular node (2) and the vertical node (3), and makes the outer wall of the combined pipe smooth, and the filling material (19) is a high-strength grouting material, UHPC or ECC.

4. The assembled double steel plate concrete composite pipeline according to claim 3 is characterized in that: The curvature of the arc-shaped outer steel plate (7) is smaller than that of the arc-shaped inner steel plate (8), and the curvature difference is determined according to the preset width of the Z-shaped side plate (9); the length difference between the cross-sectional length of the arc-shaped outer steel plate (7) and the cross-sectional length of the arc-shaped inner steel plate (8) is determined according to the preset width of the filling material (19).

5. The assembled double steel plate concrete composite pipeline according to claim 1, characterized in that: Adjacent double-steel plate concrete segment units (1) are welded in the circumferential direction to form double-steel plate concrete segments, and adjacent segments are welded in the longitudinal direction to form double-steel plate concrete pipes, and filling materials (19) are poured after connecting the nodes.

6. A construction method for the assembled double steel plate concrete composite pipeline according to any one of claims 1 to 5, characterized in that: include: 1) Processing Z-shaped side plates (9), arc-shaped outer steel plates (7) and arc-shaped inner steel plates (8); 2) Welding the Z-shaped side plates (9), the arc-shaped outer steel plates (7) and the arc-shaped inner steel plates (8) into a segment unit shell (4), pouring interlayer concrete (5) in the segment unit shell (4), and completing the processing of the double steel plate concrete segment unit (1); 3) The double steel plate concrete segment unit (1) is transported to the site, and a plurality of prefabricated pipe sections are obtained by using the annular nodes (2). The prefabricated pipe sections are connected along the length direction through the vertical nodes (3) to obtain a double steel plate concrete composite pipe.

7. The construction method according to claim 6, characterized in that: The Z-shaped side plate (9) is formed by welding a first side plate (11), a second side plate (12) and a third side plate (13) in sequence, and an embedded bolt group is installed on the second side plate (12) along the length direction, and the embedded bolt group consists of a first embedded bolt group (61) located at both ends and a second embedded bolt group (62) located in the middle; The annular node (2) includes an annular connecting plate (14), and a reserved hole corresponding to the position of the first embedded bolt group (61) is processed on the annular connecting plate (14); The vertical node (3) includes a vertical connecting plate (18), and a reserved hole corresponding to the position of the second embedded bolt group (62) is processed on the vertical connecting plate (18); On site, the second side plates (12) of the circumferentially adjacent double-steel plate concrete segment units (1) are connected via the circumferential connecting plate (14) and the second embedded bolt group (62) to achieve circumferential connection, and the second side plates (12) of the axially adjacent double-steel plate concrete segment units (1) are connected via the vertical connecting plate (18) and the first embedded bolt group (61) to achieve axial connection.

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