Method for installing sacrificial anode of subsea tunnel

Abstract

The invention relates to the field of subsea tunnels, in particular to a subsea tunnel sacrificial anode mounting method which comprises the steps that S1, a steel pipe piece and an inverted arch of a subsea tunnel are constructed and formed, and a first embedded connecting beam and a first embedded welding plate are arranged at the junction of the inverted arch and the steel pipe piece; the two ends of the first embedded connecting beam are connected with the steel pipe piece and the first embedded welding plate correspondingly, the first embedded welding plate is located on the surface of a concrete lining to be poured, and the surface of the side, away from the first embedded connecting beam, of the first embedded welding plate is connected with a cover plate. S2, a steel reinforcement framework of the concrete lining is installed, the steel reinforcement framework, the steel pipe pieces, the first pre-embedded connecting beams and the first pre-embedded welding plate are electrically communicated, the concrete lining is poured for forming, connection between the cover plate and the first pre-embedded welding plate is removed, and the first pre-embedded welding plate is exposed out of the surface of the concrete lining; and S3, the sacrificial anode block is transported to the first pre-embedded welding plate, and the welding lug of the sacrificial anode block is connected with the first pre-embedded welding plate in a welded mode. The installation method is simple in step and good in effect.

Description

Technical Field

[0001] This invention relates to the field of submarine tunnels, and in particular to a method for installing sacrificial anodes in submarine tunnels. Background Technology

[0002] The metal structures of submarine tunnels are highly susceptible to severe electrochemical corrosion due to the humid and high-salt marine environment. In particular, the internal steel segments, concrete reinforcements, and metal supports are extremely prone to corrosion. Sacrificial anodes are usually installed inside submarine tunnels to implement cathodic protection.

[0003] like Figure 1 and Figure 2 As shown, in the industry, it is common practice to connect sacrificial anode block 1 at the top of the tunnel during the construction of subsea tunnels. Figure 1 The example submarine tunnel includes a steel segment 01, with a concrete lining 02 inside the steel segment 01. A second pre-embedded welding plate 04 and a second pre-embedded connecting beam 05 are provided on the top of the concrete lining 02. The second pre-embedded welding plate 04 is located on the surface of the concrete lining 02. The second pre-embedded welding plate 04 connects the steel segment 01 and the steel reinforcement skeleton of the concrete lining 02 through the second pre-embedded connecting beam 05. The second pre-embedded welding plate 04, the steel segment 01, and the steel reinforcement skeleton of the concrete lining 02 are electrically connected. Then, the sacrificial anode block 1 is placed on the support frame 06 and transported into place. The support frame 06 is raised by a lifting device, and the welding lugs 11 of the sacrificial anode block 1 are welded to the second pre-embedded welding plate 04 to complete the installation.

[0004] However, the number of sacrificial anode blocks 1 installed in the submarine tunnel is large, and each sacrificial anode block 1 weighs several hundred kilograms. It is not easy for personnel to position the sacrificial anode block 1 during lifting and installation. At the same time, there is no welding operation platform, which makes it difficult for personnel to weld. The cumulative installation of sacrificial anode blocks 1 leads to personnel fatigue and the project schedule is likely to be delayed. Summary of the Invention

[0005] The purpose of this invention is to address the problems in existing technologies where subsea tunnels require a large number of sacrificial anode blocks, each weighing hundreds of kilograms. These problems include difficulties in manually positioning the sacrificial anode blocks during lifting and installation, the lack of a welding platform leading to welding difficulties, and the resulting fatigue and delays in the construction process. The invention provides a method for installing sacrificial anodes in subsea tunnels.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for installing a sacrificial anode in a submarine tunnel includes the following steps: S1. The steel pipe segments and invert of the undersea tunnel are constructed and formed. A first pre-embedded connecting beam and a first pre-embedded welding plate are set at the junction of the invert and the steel pipe segments. The two ends of the first pre-embedded connecting beam are respectively connected to the steel pipe segments and the first pre-embedded welding plate. The first pre-embedded welding plate is located on the surface of the concrete lining to be poured. A cover plate is connected to the surface of the first pre-embedded welding plate away from the first pre-embedded connecting beam. S2. Install the steel reinforcement cage of the concrete lining, wherein the steel reinforcement cage, the steel pipe segment, the first pre-embedded connecting beam and the first pre-embedded welded plate are electrically connected, the concrete lining is poured and formed, the connection between the cover plate and the first pre-embedded welded plate is released, and the first pre-embedded welded plate is exposed on the surface of the concrete lining. S3. Transport the sacrificial anode block to the first pre-embedded welding plate and weld the welding lugs of the sacrificial anode block to the first pre-embedded welding plate.

[0007] The present invention provides a method for installing sacrificial anodes in a submarine tunnel. By placing the first pre-embedded connecting beam and the first pre-embedded welding plate at the junction of the invert and the steel pipe segment, the installation position of the sacrificial anode block is moved from the top of the submarine tunnel to both sides of the bottom of the tunnel. This eliminates the need for high-altitude operations (special operations performed at heights of 2 meters or more above the fall height reference plane where a fall is possible) and does not affect passage within the tunnel. The cover plate allows for rapid forming of the first pre-embedded welding plate on the concrete lining surface, preventing contamination and facilitating the rapid installation of the sacrificial anode block. Welding operators can directly weld the sacrificial anode block on the invert, simplifying the operation, reducing fatigue by eliminating the need for prolonged overhead work, improving installation efficiency, and preventing project delays. This installation method is simple and effective.

[0008] As a preferred technical solution of the present invention, in step S1, the cover plate is made of foam board.

[0009] As a further preferred technical solution of the present invention, the foam board is bonded to the surface of the first pre-embedded welding plate.

[0010] As a preferred technical solution of the present invention, in step S3, a transport trolley is used to transport the sacrificial anode block to the first pre-embedded welding plate and install the sacrificial anode block.

[0011] As a further preferred technical solution of the present invention, the transport trolley includes a vehicle body and a work platform. The work platform is detachably connected to the sacrificial anode block and can adjust the tilt angle of the sacrificial anode block. The work platform is lifted and connected to the vehicle body.

[0012] As a further preferred technical solution of the present invention, a pusher is rotatably connected to one end of the workbench, the pusher being able to fit against the side wall of the sacrificial anode block, and a winch is connected to the top of the workbench, the winch being connected to the welding lug via a rope.

[0013] As a further preferred technical solution of the present invention, one end of the top of the pusher is connected to one end of the work platform through a hinge, and a telescopic hydraulic cylinder is provided between the pusher and the work platform. The two ends of the telescopic hydraulic cylinder are respectively rotatably connected to one end of the bottom of the pusher and the work platform.

[0014] As a further preferred technical solution of the present invention, the vehicle body is provided with a lifting hydraulic cylinder, which is connected to the work platform.

[0015] As a preferred technical solution of the present invention, in step S3, the sacrificial anode block is transported to the first pre-embedded welding plate using a welding fixture, and the sacrificial anode block is installed by using a wedge block in conjunction with the welding fixture, the wedge block being fitted to the bottom of the welding fixture.

[0016] As a further preferred technical solution of the present invention, the welding fixture includes a frame, a cantilever portion is provided on one side of the top of the frame, a diagonal brace is connected between the cantilever portion and the frame, and a caster wheel is provided at the bottom of the frame.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The present invention discloses a method for installing sacrificial anodes in a submarine tunnel. By placing the first pre-embedded connecting beam and the first pre-embedded welding plate at the junction of the invert and the steel pipe segment, the installation position of the sacrificial anode block is moved from the top of the submarine tunnel to both sides of the bottom of the tunnel. This eliminates the need for high-altitude operations and does not affect passage within the tunnel. The cover plate allows for rapid forming of the first pre-embedded welding plate on the concrete lining surface, preventing contamination and facilitating the rapid installation of the sacrificial anode block. Welding operators can directly weld the sacrificial anode block on the invert, simplifying the operation, reducing fatigue by eliminating the need for prolonged overhead work, improving installation efficiency, and preventing project delays. This installation method is simple in steps and yields excellent results. Attached Figure Description

[0018] Figure 1 A schematic diagram (elevation) of the existing installation method for sacrificial anodes in submarine tunnels; Figure 2 A schematic diagram (view from below) showing the installation of sacrificial anodes in an existing subsea tunnel. Figure 3This is an installation diagram (elevation) of the first embedded connecting beam and the first embedded welding plate in this application. Figure 4 for Figure 3 Enlarged diagram of section A in the middle; Figure 5 This is a schematic diagram (elevation) of the concrete lining pouring process for this application. Figure 6 for Figure 5 Enlarged diagram of section B in the middle; Figure 7 This is a structural diagram of the transport trolley; Figure 8 Illustration of the use of the transport trolley Figure 1 ; Figure 9 Illustration of the use of the transport trolley Figure 2 ; Figure 10 This is a structural schematic diagram of the welding fixture; Figure 11 This is a schematic diagram illustrating the use of welding fixtures; Figure 12 This is a schematic diagram (elevation) of the installed and positioned sacrificial anode for the submarine tunnel in this application. Figure 13 for Figure 12 Enlarged diagram of section C; Figure 14 This is a top view (Schematic diagram) of the sacrificial anode in the submarine tunnel of this application after it has been installed in place.

[0019] Marked in the image: 01-Steel pipe segment, 02-Concrete lining, 03-Invert arch, 04-Second embedded welded plate, 05-Second embedded connecting beam, 06-Support frame; 1-Sacrificial anode block, 11-Welding lug; 2-First embedded connecting beam; 3-First embedded welding plate; 4-Cover plate; 5-Transport trolley, 51-Car body, 52-Work platform, 53-Push blade, 54-Winder, 55-Pulley, 56-Articulation joint, 57-Telescopic hydraulic cylinder, 58-Rope, 59-Lifting hydraulic cylinder; 6-Welding fixture, 61-Frame, 62-Cantilever, 63-Diagonal brace, 64-Wheel caster; 7-Wedge block. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0021] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0022] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0023] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0024] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0025] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0026] In related technologies, such as Figure 1 and Figure 2 As shown, the sacrificial anode block 1 is cast and formed with four inclined sides and a draft angle. Only the top and bottom surfaces of the sacrificial anode block 1 are parallel, which facilitates engineering installation. At the same time, an inverted arch 03 is set at the bottom of the tunnel for personnel and equipment to work. It is not convenient to install the sacrificial anode block at the bottom of the tunnel (forming an obstacle). In the art, the sacrificial anode block 1 is usually only installed at the top of the tunnel, and the top or bottom surface of the sacrificial anode block 1 is connected by a connector. Therefore, in the art, the existing sacrificial anode blocks 1 are all installed at the top inside the submarine tunnel.

[0027] During the construction of the undersea tunnel, steel pipe segments 01 are first installed. Then, a second pre-embedded connecting beam 05 and a second pre-embedded welded plate 04 are installed at the top of the tunnel. Next, an invert arch 03 and a concrete lining 02 are poured inside the steel pipe segments 01. The second pre-embedded welded plate 04 is located on the surface of the concrete lining 02. The steel reinforcement skeletons of the second pre-embedded welded plate 04, the steel pipe segments 01, and the concrete lining 02 are electrically connected. Then, the sacrificial anode block 1 is placed on the support frame 06 and transported into place. The support frame 06 is raised by a lifting device, and the welding lugs 11 of the sacrificial anode block 1 are welded to the second pre-embedded welded plate 04 to complete the installation.

[0028] However, the number of sacrificial anode blocks 1 installed in the submarine tunnel is large, and each sacrificial anode block 1 weighs several hundred kilograms. During lifting and installation, it is difficult for personnel to position the sacrificial anode blocks 1 manually. Furthermore, the lack of a welding platform makes welding operations difficult, and the cumulative installation of sacrificial anode blocks 1 leads to personnel fatigue, easily causing delays in the project schedule. Therefore, the technical solution of this application was developed. The following is a detailed explanation... Figures 3 to 14 To elaborate.

[0029] Example 1 like Figures 3 to 9 , Figures 12 to 14 As shown, the installation method of a sacrificial anode for a submarine tunnel according to the present invention includes the following steps: S1, such as Figure 3As shown, the steel pipe segment 01 and the invert arch 03 of the undersea tunnel are constructed and formed. A first embedded connecting beam 2 and a first embedded welding plate 3 are installed at the junction of the invert arch 03 and the steel pipe segment 01. The two ends of the first embedded connecting beam 2 are respectively connected to the steel pipe segment 01 and the first embedded welding plate 3. The first embedded welding plate 3 is located on the surface of the concrete lining 02 to be poured. Figure 4 As shown, a cover plate 4 is connected to the surface of the first embedded welding plate 3 on the side away from the first embedded connecting beam 2.

[0030] In an optional embodiment, the cover plate 4 is made of foam board, which is bonded to the surface of the first pre-embedded welding plate 3 for easy removal later.

[0031] S2. Install the reinforcing steel frame of the concrete lining 02, wherein the reinforcing steel frame, the steel pipe segment 01, the first embedded connecting beam 2, and the first embedded welded plate 3 are electrically connected; Figure 5 As shown, the concrete lining 02 is poured and formed; as Figure 6 As shown, the connection between the cover plate 4 and the first embedded welding plate 3 is released, exposing the first embedded welding plate 3 on the surface of the concrete lining 02.

[0032] In an alternative implementation, the foam board is removed, and the surface of the first pre-embedded welding plate 3 is cleaned.

[0033] S3, such as Figures 7 to 9 ,as well as Figure 5 As shown, the sacrificial anode block 1 is transported to the first pre-embedded welding plate 3 using a transport trolley 5, and the sacrificial anode block 1 is installed using the transport trolley 5; Figure 12 and Figure 13 As shown, the welding lugs 11 of the sacrificial anode block 1 are welded to the first pre-embedded welding plate 3; the installation and welding of all the sacrificial anode blocks 1 on both sides of the invert arch 03 are completed, as shown. Figure 14 As shown.

[0034] In one alternative implementation, such as Figures 7 to 9As shown, the transport trolley 5 includes a vehicle body 51 and a work platform 52. The work platform 52 is detachably connected to the sacrificial anode block 1 and can adjust the tilt angle of the sacrificial anode block 1. The work platform 52 is vertically connected to the vehicle body 51. Specifically, a pusher 53 is rotatably connected to one end of the work platform 52. The pusher 53 can fit against the side wall of the sacrificial anode block 1. A winch 54 and a fixed pulley 55 are connected to the top of the work platform 52. The winch 54 is connected to the welding lug 11 after passing a rope 58 around the fixed pulley 55. One side of the top of the pusher 53 is connected to one end of the work platform 52 through a hinge 56. A telescopic hydraulic cylinder 57 is provided between the pusher 53 and the work platform 52. The two ends of the telescopic hydraulic cylinder 57 are rotatably connected to one side of the bottom of the pusher 53 and the work platform 52, respectively. A lifting hydraulic cylinder 59 is provided on the vehicle body 51 and is connected to the work platform 52. Using the transport trolley 5, the sacrificial anode block 1 can be lifted upward by the winch 54. With the drive of the pusher 53, the sacrificial anode block 1 can be rotated to the required tilt state. Then, the transport trolley 5 transports the sacrificial anode block 1 to the first pre-embedded welding plate 3. Driven by the lifting hydraulic cylinder 59, the height of the worktable 52 is raised, raising the welding ear 11 to the same height position as the first pre-embedded welding plate 3. Then, the transport trolley 5 drives the welding ear 11 to approach and abut against the first pre-embedded welding plate 3 so that the welding operator can weld the two together.

[0035] This embodiment describes a method for installing sacrificial anodes in a submarine tunnel. By placing the first pre-embedded connecting beam 2 and the first pre-embedded welding plate 3 at the junction of the invert arch 03 and the steel pipe segment 01, the installation position of the sacrificial anode block 1 is moved from the top of the submarine tunnel to both sides of the bottom of the tunnel. This eliminates the need for high-altitude operations and does not affect passage within the tunnel. The cover plate 4 allows for the rapid formation of the first pre-embedded welding plate 3 on the surface of the concrete lining 02, preventing contamination and facilitating the rapid installation of the sacrificial anode block 1. Welding operators can directly weld the sacrificial anode block 1 on the invert arch 03, simplifying the operation, reducing fatigue by eliminating the need for prolonged overhead work, improving the installation efficiency of the sacrificial anode block 1, and avoiding project delays. Furthermore, compared to existing technologies where the sacrificial anode block 1 is hoisted to the top of the submarine tunnel (see...), this method... Figure 1The weight of the sacrificial anode block 1 acts on the second embedded connecting beam 05, which in turn generates tensile stress on the concrete lining 02. Meanwhile, the weight of the sacrificial anode block 1 acts on the first embedded connecting beam 2, which in turn generates compressive stress on the concrete lining 02. Since concrete is resistant to compression but not to tension, the technical solution of this application is significantly superior to the existing technical solution. The installation method is simple and effective.

[0036] Example 2 like Figures 10 to 11 As shown, the installation method of the sacrificial anode for a submarine tunnel according to the present invention differs from that of Embodiment 1 in that, in this embodiment, in step S3, a welding fixture 6 is used to transport the sacrificial anode block 1 to the first pre-embedded welding plate 3, and the sacrificial anode block 1 is installed by wedge 7 in cooperation with the welding fixture 6, wherein the wedge 7 is fitted at the bottom of the welding fixture 6.

[0037] In one alternative implementation, such as Figures 10 to 11 As shown, the welding fixture 6 includes a frame 61, a cantilever 62 on one side of the top of the frame 61, a diagonal brace 63 connecting the cantilever 62 and the frame 61, and casters 64 at the bottom of the frame 61. In use... Figure 10 As shown, an inclined surface of the sacrificial anode block 1 is placed on the cantilever portion 62, with the welding lug 11 of the sacrificial anode block 1 facing away from the frame 61; after the sacrificial anode block 1 is transported to the first pre-embedded welding plate 3 by the welding fixture 6, as... Figure 11 The operator gradually inserts the wedge 7 into the caster 64 on the bottom side of the welding fixture 6 away from the cantilever 62, tilting and lifting that side of the welding fixture 6. At this time, the other side of the welding fixture 6 tilts downward, tilting the sacrificial anode block 1 onto the concrete lining 02. Since the dimensions of the welding fixture 6 are customized according to the position of the first pre-embedded welding plate 3, the welding lug 11 can fall exactly on the first pre-embedded welding plate 3 after the sacrificial anode block 1 is tilted. During the tilting process, the operator connects the sacrificial anode block 1 with a rope to align and limit its position, and gradually lowers it. The sacrificial anode block 1 is slowly placed onto the concrete lining 02 by loosening the rope to prevent it from rapidly colliding with the concrete lining 02 and cracking when it tilts. At the same time, the position of the welding fixture 6 is manually fixed, and the welding fixture 6 is used as a lever to pry the bottom side of the sacrificial anode block 1 to prevent it from sliding down the concrete lining 02. By utilizing the lever principle, only a small force is needed to keep the welding fixture 6 stationary, which can stabilize the sacrificial anode block 1. Then, the welding operator welds the welding lug 11 and the first pre-embedded welding plate 3 together.

[0038] The above description is only a preferred embodiment of the present invention and is 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 method for installing a sacrificial anode in a submarine tunnel, characterized in that, Includes the following steps: S1. The steel pipe segment (01) and invert arch (03) of the undersea tunnel are constructed and formed. A first pre-embedded connecting beam (2) and a first pre-embedded welding plate (3) are set at the junction of the invert arch (03) and the steel pipe segment (01). The two ends of the first pre-embedded connecting beam (2) are respectively connected to the steel pipe segment (01) and the first pre-embedded welding plate (3). The first pre-embedded welding plate (3) is located on the surface of the concrete lining (02) to be poured. A cover plate (4) is connected to the surface of the first pre-embedded welding plate (3) away from the first pre-embedded connecting beam (2). S2. Install the steel reinforcement frame of the concrete lining (02), the steel reinforcement frame, the steel pipe segment (01), the first pre-embedded connecting beam (2) and the first pre-embedded welding plate (3) are electrically connected, the concrete lining (02) is poured and formed, the connection between the cover plate (4) and the first pre-embedded welding plate (3) is released, and the first pre-embedded welding plate (3) is exposed on the surface of the concrete lining (02). S3. Transport the sacrificial anode block (1) to the first pre-embedded welding plate (3) and weld the welding lug (11) of the sacrificial anode block (1) to the first pre-embedded welding plate (3).

2. The installation method of the sacrificial anode for a submarine tunnel according to claim 1, characterized in that, In step S1, the cover plate (4) is made of foam board.

3. The method for installing the sacrificial anode in a submarine tunnel according to claim 2, characterized in that, The foam board is bonded to the surface of the first pre-embedded welding plate (3).

4. The method for installing a sacrificial anode in a submarine tunnel according to any one of claims 1-3, characterized in that, In step S3, a transport trolley (5) is used to transport the sacrificial anode block (1) to the first pre-embedded welding plate (3) and install the sacrificial anode block (1).

5. The method for installing a sacrificial anode in a submarine tunnel according to claim 4, characterized in that, The transport trolley (5) includes a vehicle body (51) and a work platform (52). The work platform (52) is detachably connected to the sacrificial anode block (1) and can adjust the tilt angle of the sacrificial anode block (1). The work platform (52) is vertically connected to the vehicle body (51).

6. The method for installing a sacrificial anode in a submarine tunnel according to claim 5, characterized in that, One end of the workbench (52) is rotatably connected to a pusher (53), which can fit against the side wall of the sacrificial anode block (1). A winch (54) is connected to the top of the workbench (52), and the winch (54) is connected to the welding lug (11) via a rope (58).

7. The method for installing a sacrificial anode in a submarine tunnel according to claim 6, characterized in that, The top end of the pusher (53) is connected to one end of the worktable (52) via a hinge (56). A telescopic hydraulic cylinder (57) is provided between the pusher (53) and the worktable (52). The two ends of the telescopic hydraulic cylinder (57) are rotatably connected to the bottom end of the pusher (53) and the worktable (52) respectively.

8. The method for installing a sacrificial anode in a submarine tunnel according to claim 5, characterized in that, The vehicle body (51) is equipped with a lifting hydraulic cylinder (59), which is connected to the work platform (52).

9. The method for installing a sacrificial anode in a submarine tunnel according to any one of claims 1-3, characterized in that, In step S3, the sacrificial anode block (1) is transported to the first pre-embedded welding plate (3) using a welding fixture (6). The sacrificial anode block (1) is installed using a wedge block (7) in conjunction with the welding fixture (6). The wedge block (7) is fitted to the bottom of the welding fixture (6).

10. The method for installing a sacrificial anode in a submarine tunnel according to claim 9, characterized in that, The welding fixture (6) includes a frame (61), a cantilever (62) is provided on one side of the top of the frame (61), a diagonal brace (63) is connected between the cantilever (62) and the frame (61), and a caster wheel (64) is provided at the bottom of the frame (61).

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