Glass fiber reinforced plastic liner tube for ocean engineering shield tunnel and preparation method of glass fiber reinforced plastic liner tube

Abstract

The invention discloses a glass fiber reinforced plastic liner pipe for an ocean engineering shield tunnel and a preparation method thereof, the glass fiber reinforced plastic liner pipe comprises a glass fiber reinforced plastic pipeline, fixing rings are arranged on the outer wall of the glass fiber reinforced plastic pipeline, the fixing rings are distributed in the axial direction of the glass fiber reinforced plastic pipeline, and universal guide wheels are arranged on the fixing rings. The glass fiber reinforced plastic liner tube has excellent chemical corrosion resistance and can effectively resist corrosion of various corrosive substances in seawater, and the maintenance frequency and cost caused by material corrosion are greatly reduced. The fixing rings and the universal guide wheels are arranged on the outer wall of the glass fiber reinforced plastic pipeline, so that the liner pipe can be positioned and guided more stably in the installation process, and meanwhile, the anti-floating effect is achieved when slurry on the outer side is poured. By means of the design, the installation precision is improved, the lining pipe adapts to the condition that the inner surface of a tunnel is irregular, the adaptability of the lining pipe to complex geological conditions is enhanced, and therefore the construction quality and efficiency are guaranteed.

Description

Technical Field

[0001] The invention relates to the application field of composite materials, and in particular to a glass fiber reinforced plastic liner pipe for a shield tunnel of an ocean engineering and a preparation method thereof. Background Art

[0002] In the field of marine engineering, shield tunnels are an important part of connecting land and islands and cross-sea passages. Their construction quality and durability are directly related to the success of the entire project. Traditional shield tunnel lining materials are mainly reinforced concrete. Although this material has high strength and good compressive resistance, it faces many challenges in the complex marine environment.

[0003] First, the seawater in the marine environment contains a large amount of salt and other corrosive substances, which will accelerate the corrosion of steel bars and weaken the overall stability of the concrete structure. Over time, the rusted steel bars will cause concrete cracking, reduce the bearing capacity of the lining, and ultimately affect the safe operation of the tunnel. In addition, marine organisms such as shellfish and algae may also attach to the surface of concrete, forming biofouling, increasing the difficulty and cost of maintenance. Secondly, during long-term use, due to vibrations and shocks caused by factors such as tidal changes and ship activities, traditional lining materials are prone to fatigue damage. Especially in deep sea areas, the water pressure is high and the requirements for lining structures are more stringent. If the lining material cannot effectively resist external pressure, it may deform or even rupture, posing potential safety hazards to the tunnel.

[0004] In addition, due to the complex marine environment, the marine shield lining is not easy to maintain, so how to ensure the long-term use of the shield tunnel is particularly important. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a fiberglass liner for a shield tunnel of an ocean engineering and a preparation method thereof.

[0006] The present invention provides a fiberglass liner for a shield tunnel in an ocean engineering and a preparation method thereof, which adopts the following technical scheme: A glass fiber reinforced plastic liner for a shield tunnel in an ocean engineering comprises a glass fiber reinforced plastic pipe, a fixing ring is arranged on the outer wall of the glass fiber reinforced plastic pipe, the fixing ring is distributed along the axial direction of the glass fiber reinforced plastic pipe, and a universal guide wheel is arranged on the fixing ring.

[0007] Through the above technical solutions, the FRP material itself has excellent chemical corrosion resistance. It can effectively resist the erosion of various corrosive substances in seawater, greatly reducing the maintenance frequency and cost caused by material corrosion. By setting a fixing ring and a universal guide wheel on the outer wall of the FRP pipe, the liner can be more stably positioned and guided during the installation process. This design not only improves the installation accuracy, but also adapts to the irregular surface of the tunnel interior, enhances the liner's ability to adapt to complex geological conditions, thereby ensuring the quality and efficiency of construction, and also plays a role in anti-floating when pouring the outer slurry.

[0008] As a preferred embodiment of the present invention, a grid layer is also distributed on the outer wall of the FRP pipe, and the grid layer is a structure formed by winding FRP fibers.

[0009] Through the above technical solution, the design of the grid layer distributed on the outer wall of the FRP pipe significantly enhances the overall structural strength of the pipe, and when combined with concrete, the grid layer plays a role in enhancing the bonding between the two and preventing the occurrence of slippage. This ensures the stability and durability of the liner structure in long-term use, especially suitable for marine environments that require high load-bearing capacity and corrosion resistance.

[0010] As a preferred embodiment of the present invention, the fixing ring includes at least one end plate fixing ring arranged at one axial end of the FRP pipe, a detachable end plate is provided on the end plate fixing ring, grouting holes and exhaust holes are provided on the end plate, and a control valve is also provided on the exhaust hole.

[0011] Through the above technical solution, the design of the end plate fixing ring and the removable end plate allows a closed space to be formed during the installation process for grouting operations, while the grouting holes and exhaust holes on the end plate ensure the uniformity and density of the concrete filling process. This design simplifies the construction process, improves the construction quality, and is also convenient for later maintenance or replacement, reducing operating costs.

[0012] As a preferred embodiment of the present invention, an end plate fixing plate is provided on the end plate fixing ring, and the end plate is fixed to the end plate fixing ring by bolts.

[0013] Through the above technical solution, the combination of the end plate fixing plate and the bolt fixing method provides a convenient and reliable means of end plate installation, so that the end plate can be firmly fixed on the fixing ring, ensuring the pressure bearing capacity and sealing during grouting. This design not only facilitates on-site operation, but also ensures a good combination between the liner and the inner wall of the tunnel, and improves the safety and stability of the overall structure.

[0014] As a preferred embodiment of the present invention, the FRP pipe is formed by splicing multiple sections, and a spigot and a socket are respectively provided at the connection between two adjacent sections of the FRP pipe. The spigot can be inserted into the socket, and a sealing ring is provided on the outer periphery of the spigot.

[0015] Through the above technical solution, the design of the spigot and socket and the sealing ring is adopted to achieve a quick and tight connection between two adjacent sections of FRP pipes, avoiding the risk of external water infiltration. At the same time, it also simplifies the splicing process, improves work efficiency, and reduces construction difficulty.

[0016] As a preferred embodiment of the present invention, a connecting rod for reinforcement is further provided at the connection between two adjacent sections of FRP pipes, one end of the connecting rod is connected to a fixing ring on one of the FRP pipes, and the other end of the connecting rod is connected to a fixing ring on the other FRP pipe.

[0017] Through the above technical solution, the fixing rings on two adjacent sections of FRP pipes are connected by reinforced connecting rods, which increases the overall rigidity and connection reliability of the multiple sections of pipes after splicing. It can prevent the adjacent FRP pipes from being disconnected when the FRP pipes are pushed into the tunnel. At the same time, it also helps to resist the adverse effects of external pressure and vibration, enhances the seismic performance of the liner system, and ensures the safety and stability of long-term use.

[0018] As a preferred embodiment of the present invention, the universal guide wheel has a telescopic margin in the radial direction of the glass fiber reinforced plastic pipe.

[0019] Through the above technical solution, the universal guide wheel has a telescopic margin in the radial direction, so that the FRP liner can flexibly cope with the unevenness of the inner wall of the tunnel during the pushing process, reducing friction resistance and protecting the pipeline surface from damage. It improves the success rate of installation and is also conducive to reducing potential risks caused by improper installation.

[0020] The present invention also discloses a method for preparing the above-mentioned fiberglass reinforced plastic liner for a shield tunnel in an ocean engineering, comprising the following steps: S1. Prepare a FRP pipe, wind the FRP pipe by using glass fiber winding, and install a fixing ring on the outer circumference of the wound FRP pipe; S2. Install support members in the FRP pipe to support the inner wall of the FRP pipe so that the cross section of the FRP pipe remains circular; S3, push the FRP pipe into the shield tunnel, and after the FRP pipe reaches the designated position, install end plates on both sides of the FRP pipe axially to form a closed space between the FRP pipe and the inner wall of the shield tunnel; S4. Grouting is performed from the grouting holes on the end plate to fill the closed space between the FRP pipe and the inner wall of the shield tunnel with concrete; S5. After the concrete solidifies, remove the end plates and the supporting parts inside the FRP pipe.

[0021] Through the above technical solution, the FRP pipe is pushed into the tunnel and poured with concrete, so that the FRP pipe can be combined with the tunnel, which improves the corrosion resistance of the tunnel. During the preparation process, supports are installed inside the FRP pipe to maintain the circular cross-section, ensuring that the geometric shape of the pipe does not deform under the action of external forces, laying a solid foundation for subsequent installation and grouting operations. At the same time, the strength is improved by support, and the thickness of the FRP pipe can be reduced. This method effectively improves the molding quality of the liner and the convenience of construction, which is an important guarantee for achieving efficient and high-quality construction, and also reduces costs.

[0022] As a preferred embodiment of the present invention, when the FRP pipe is spliced ​​in multiple sections, when the FRP pipe is pushed into the shield tunnel, the multiple sections of the FRP pipe are spliced ​​in advance and locked by connecting rods. When the spliced ​​FRP pipe reaches the specified position, the end plate is installed and grouting is performed.

[0023] Through the above technical solution, for the multi-section fiberglass pipe, the method of pre-joining and locking it with a connecting rod before pushing it into the tunnel greatly reduces the cumulative error caused by segmented operation and improves the one-time success rate of installation. In addition, this method shortens the construction period and reduces the construction cost, which is one of the effective measures to improve construction efficiency.

[0024] As a preferred embodiment of the present invention, when the FRP pipe is spliced ​​in multiple sections, a single section or multiple sections are first spliced ​​and then sent to a designated position for grouting. After grouting, the end plate is removed, and the next section of the FRP pipe is inserted into the previous section of the FRP pipe. An end plate is installed at the end of the FRP pipe section away from the splicing point and grouting is performed.

[0025] Through the above technical solution, the segmented grouting method solves the problem of long-distance one-time grouting being difficult to control. By completing the grouting section by section, the quality of concrete filling between each section of the liner and the inner wall of the tunnel is ensured. This method not only improves the safety of construction, but also makes the construction process more controllable, which is conducive to improving the quality and progress management of the entire project.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The FRP liner for marine engineering shield tunnel provided by the present invention adopts high-strength, corrosion-resistant FRP material. Compared with traditional reinforced concrete materials, it has excellent chemical corrosion resistance. It can effectively resist the erosion of various corrosive substances in seawater, greatly reducing the maintenance frequency and cost caused by material aging. In addition, the outer wall of the FRP liner is provided with a grid layer, which is formed by winding glass fibers, which not only enhances the overall structural strength of the pipeline, but also forms a composite structure with the subsequently injected concrete, further improving the bonding force between the liner and the concrete, preventing the slippage between the two, and ensuring the stability and safety of the liner structure during long-term use. This makes the FRP liner of the present invention particularly suitable for shield tunnel construction in marine environments, and can significantly improve the durability of tunnel linings, thereby extending their service life.

[0027] 2. The multi-section splicing method of the FRP liner and the socket and socket structure set at the connection, combined with the application of O-rings, ensures the close connection and good sealing between the sections of the pipeline, and effectively prevents the influence of external pressure on the internal structure. At the same time, the universal guide wheel set on the fixed ring has a certain radial expansion margin. This feature allows the FRP liner to adapt to the irregularities of the internal surface of the tunnel during installation, and maintain good positioning and guiding even in a relatively rugged or deformed tunnel.

[0028] 3. The preparation of the FRP liner of the present invention adopts glass fiber winding technology to manufacture FRP pipes, and installs fixing rings and universal guide wheels on the periphery, ensuring high-quality production and convenient transportation of the liner. Secondly, during the installation process, multiple sections of FRP pipes are spliced ​​in advance and locked by connecting rods, so that longer pipes can be pushed to the specified position at one time, reducing the cumulative error caused by segmented operations and improving installation accuracy. Furthermore, the design of the end plate facilitates grouting operations. By setting grouting holes and exhaust holes on the end plate, uniform grouting can be achieved in a closed space, avoiding the problem of gaps caused by residual air and ensuring the quality of concrete filling.

[0029] 4. When the tunnel is long, the segmented grouting method is adopted, which not only solves the problem of long-distance grouting being difficult to control at one time, but also shortens the overall construction period. The entire installation process does not require large-scale demolition and reconstruction work. Once local damage occurs, only the corresponding part needs to be replaced, which greatly facilitates later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of a single fiberglass reinforced plastic liner pipe for a shield tunnel in an ocean engineering according to the present invention.

[0031] Figure 2 It is a schematic diagram of the structure of the spliced ​​fiberglass liner pipes for shield tunnels in marine engineering according to the present invention.

[0032] Figure 3 It is a structural schematic diagram of the splicing of the glass fiber reinforced plastic liner pipe according to the present invention.

[0033] Figure 4 It is a structural schematic diagram of installing a glass fiber reinforced plastic liner pipe for a shield tunnel of an ocean engineering into a tunnel according to the present invention.

[0034] Figure 5 yes Figure 4 Enlarged view of part A.

[0035] Figure 6 It is a schematic diagram of the installation of a glass fiber reinforced plastic liner pipe for a shield tunnel of an ocean engineering into a three-dimensional structure of a tunnel according to the present invention.

[0036] Explanation of the reference numerals: 1. FRP pipe; 2. Mesh layer; 3. Socket; 4. Socket; 5. O-ring; 6. Fixing ring; 7. Universal guide wheel; 8. End plate fixing ring; 9. End plate; 10. Grouting hole; 11. Exhaust hole; 12. End plate fixing plate; 13. Support member; 14. Connecting rod; 15. Tunnel. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-6 The present invention is described in further detail.

[0038] Embodiment 1: Reference Figures 1 to 3 This embodiment discloses a FRP liner for shield tunnels in marine engineering, including a FRP pipe 1, which is formed by splicing multiple sections. Each section of the FRP pipe 1 is made by winding glass fibers, and the inner wall of the FRP pipe 1 is smooth, and the outer wall is also formed by winding glass fibers and forming a mesh layer 2. Each section of the FRP pipe 1 is provided with a socket 3 and a socket 4 on both sides of the axial direction. When two adjacent FRP pipes 1 are spliced, the socket 3 of one FRP pipe 1 can be inserted into the socket 4 of the other FRP pipe 1, and a sealing ring installation groove is provided on the outer periphery of the socket 3, and an O-type sealing ring 5 is installed in the sealing ring installation groove. Specifically, two O-type sealing rings 5 ​​are provided on each socket to ensure the sealing between the two sections of the FRP pipes 1 after splicing. Of course, if multiple sections of FRP pipes 1 are spliced, the frontmost FRP pipe 1 can only be provided with a socket 4, and the rearmost FRP pipe 1 can only be provided with a socket 3.

[0039] A fixing ring 6 is arranged on the outer wall of the FRP pipe 1, and the fixing ring 6 is distributed along the axial direction of the FRP pipe 1. In this embodiment, the fixing ring 6 can be arranged every 1-3 meters in the axial direction of the FRP pipe 1. The fixing ring 6 is a structure of two semicircular shapes, which are locked and fixed by locking bolts to fasten the fixing ring 6 to the outer periphery of the FRP pipe 1. A universal guide wheel 7 is arranged on the fixing ring 6, and the universal guide wheels 7 are evenly distributed in the circumference of the fixing ring 6. The specific number of the universal guide wheels 7 is determined according to the diameter of the fixing ring 6. The function of the universal guide wheel 7 is to guide the FRP pipe 1 when the FRP pipe 1 is sent into the tunnel, and at the same time, it also has a positioning function for the FRP pipe 1, and at the same time, it plays a role in anti-floating when the outer slurry is poured. The universal guide wheel 7 has a telescopic margin in the radial direction of the FRP pipe 1, so that it can adapt to the uneven conditions inside the tunnel.

[0040] The fixing ring 6 includes at least one end plate fixing ring 8 arranged at one axial end of the FRP pipe 1, a detachable end plate 9 is arranged on the end plate fixing ring 8, and a universal guide wheel 7 can also be installed on the end plate fixing ring 8. In this embodiment, an end plate fixing plate 12 is arranged on the end plate fixing ring 8, and the end plate 9 is fixed to the end plate fixing ring 8 by bolts. Grouting holes 10 and exhaust holes 11 are arranged on the end plate 9, and a control valve is also arranged on the exhaust hole 11.

[0041] Since the FRP pipe 1 needs to be moved in the tunnel after splicing, in order to improve the connection reliability of the two adjacent FRP pipes 1, a connecting rod 14 for reinforcement is also provided at the connection between the two adjacent sections of the FRP pipe 1. One end of the connecting rod 14 is connected to the fixing ring 6 on one of the FRP pipes 1, and the other end of the connecting rod 14 is connected to the fixing ring 6 on the other FRP pipe 1.

[0042] Embodiment 2: This embodiment discloses a method for preparing the above-mentioned fiberglass reinforced plastic liner for a shield tunnel in an ocean engineering, comprising the following steps: S1. Prepare a FRP pipe, and wind the FRP pipe 1 by winding glass fiber, first winding it into a cylindrical FRP pipe, and then continue to wind glass fiber on the outer wall of the FRP pipe to form a grid layer 2. Finally, install a fixing ring 6 on the outer periphery of the wound FRP pipe 1, and clamp the fixing ring 6 on the outer periphery of the FRP pipe 1 by locking bolts.

[0043] S2. Install a support member 13 in the FRP pipe 1 to support the inner wall of the FRP pipe so that the cross-section of the FRP pipe remains circular. A plurality of support members 13 are provided. In this embodiment, a support member 3 is provided at every 1-meter interval in the axial direction of the FRP pipe 1 to support the FRP pipe 1.

[0044] S3, splice the multiple sections of glass fiber reinforced plastic pipe 1 and push them into the shield tunnel 15, refer to Figure 3 and Figure 4 In this embodiment, two sections of FRP pipes 1 are spliced ​​together by inserting the socket 3 of one FRP pipe 1 into the socket 4 of another FRP pipe 1, and reinforcing the two FRP pipes 1 by installing a connecting rod 14 at the connection point. One end of the connecting rod 14 is connected to the fixing ring 6 on one of the FRP pipes 1 by bolts, and the other end of the connecting rod 14 is connected to the fixing ring 6 on the other FRP pipe 1 by bolts.

[0045] After the assembled FRP pipe 1 is pushed into the designated position, end plates 9 are installed on both axial sides of the FRP pipe 1. Specifically, the end plates 9 are fixed to the end plate fixing plates 12 on the end plate fixing rings 8 by bolts from the openings on both sides of the tunnel, and a closed space is formed between the FRP pipe and the inner wall of the shield tunnel through the end plates 9.

[0046] S4. Grouting is performed from the grouting holes 10 on the end plate 9. During grouting, exhaust is discharged through the exhaust holes 11 on the upper end of the end plate 9, and the closed space between the FRP pipe 1 and the inner wall of the shield tunnel is filled with concrete. Since a mesh layer 2 is provided on the outer wall of the FRP pipe 1, the mesh layer 2 can make the concrete layer and the FRP pipe 1 well combined, thereby avoiding slippage between the FRP pipe 1 and the concrete layer.

[0047] S5, after the concrete is solidified, the end plate 9 is removed, and the support member 13 in the glass fiber reinforced plastic pipe 1 is removed. The rest of this embodiment is the same as that of embodiment 1, except that if the tunnel is long, the grouting effect is not good after the FRP pipe 1 is fully installed, so this embodiment adopts segmented grouting. This embodiment discloses a method for preparing a FRP liner for a shield tunnel in an ocean engineering, comprising the following steps: S1. Prepare a FRP pipe, and wind the FRP pipe 1 by winding glass fiber, first winding it into a cylindrical FRP pipe, and then continue to wind glass fiber on the outer wall of the FRP pipe to form a grid layer 2. Finally, install a fixing ring 6 on the outer periphery of the wound FRP pipe 1, and clamp the fixing ring 6 on the outer periphery of the FRP pipe 1 by locking bolts.

[0048] S2. Install a support member 13 in the FRP pipe 1 to support the inner wall of the FRP pipe so that the cross-section of the FRP pipe remains circular. A plurality of support members 13 are provided. In this embodiment, a support member 3 is provided at every 1-meter interval in the axial direction of the FRP pipe 1 to support the FRP pipe 1.

[0049] S3. Push the first section of the FRP pipe 1 into the shield tunnel 15. After the first section of the FRP pipe 1 reaches the designated position, install end plates 9 on both axial sides of the FRP pipe 1 to form a closed space between the FRP pipe and the inner wall of the shield tunnel.

[0050] S4. Grouting is performed from the grouting holes 10 on the end plate 9. During grouting, exhaust is discharged through the exhaust holes 11 on the upper end of the end plate 9, and the closed space between the FRP pipe 1 and the inner wall of the shield tunnel is filled with concrete. Since a mesh layer 2 is provided on the outer wall of the FRP pipe 1, the mesh layer 2 can make the concrete layer and the FRP pipe 1 well combined, thereby avoiding slippage between the FRP pipe 1 and the concrete layer.

[0051] S5, after the concrete solidifies, the end plate 9 is removed, and the second section of the glass fiber reinforced plastic pipe 1 is pushed into the tunnel and spliced ​​with the first section of the glass fiber reinforced plastic pipe. The splicing is also done by matching the splice 3 with the socket 4.

[0052] S6. Install an end plate 9 on the side of the second section of the FRP pipe 1 away from the first section of the FRP pipe 1, then perform grouting on the grouting holes 10 on the end plate 9, and exhaust air through the exhaust holes 11.

[0053] S7. After the concrete is solidified, all the support members 13 and all the end plates 9 in the FRP pipes 1 are removed.

[0054] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fiberglass liner for marine engineering shield tunnel, characterized in that: The invention comprises a glass fiber reinforced plastic pipe, wherein a fixing ring is arranged on the outer wall of the glass fiber reinforced plastic pipe, the fixing ring is distributed along the axial direction of the glass fiber reinforced plastic pipe, and a universal guide wheel is arranged on the fixing ring.

2. The fiberglass liner for marine engineering shield tunnel according to claim 1, characterized in that: A grid layer is also distributed on the outer wall of the FRP pipe, and the grid layer is a structure formed by winding FRP fibers.

3. According to claim 1, a fiberglass liner for a shield tunnel in an offshore engineering project is characterized in that: the fixing ring comprises at least one end plate fixing ring arranged at one axial end of the fiberglass pipe, a removable end plate is provided on the end plate fixing ring, grouting holes and exhaust holes are provided on the end plate, and a control valve is also provided on the exhaust hole.

4. A fiberglass liner for marine engineering shield tunnel according to claim 3, characterized in that: An end plate fixing plate is arranged on the end plate fixing ring, and the end plate is fixed on the end plate fixing ring by bolts.

5. The fiberglass liner for marine engineering shield tunnel according to claim 1, characterized in that: The FRP pipe is formed by splicing multiple sections, and a spigot and a socket are respectively provided at the connection between two adjacent sections of the FRP pipe. The spigot can be inserted into the socket, and a sealing ring is provided on the outer periphery of the spigot.

6. The fiberglass liner for marine engineering shield tunnel according to claim 5, characterized in that: A connecting rod for reinforcement is also provided at the connection of two adjacent sections of FRP pipes, one end of the connecting rod is connected to a fixing ring on one of the FRP pipes, and the other end of the connecting rod is connected to a fixing ring on the other FRP pipe.

7. The fiberglass liner for marine engineering shield tunnel according to claim 1, characterized in that: The universal guide wheel has a telescopic margin in the radial direction of the glass fiber reinforced plastic pipe.

8. A method for preparing a fiberglass liner for a shield tunnel in an offshore engineering as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Prepare a FRP pipe, wind the FRP pipe by using glass fiber winding, and install a fixing ring on the outer circumference of the wound FRP pipe; S2. Install support members in the FRP pipe to support the inner wall of the FRP pipe so that the cross section of the FRP pipe remains circular; S3, push the FRP pipe into the shield tunnel, and after the FRP pipe reaches the designated position, install end plates on both sides of the FRP pipe axially to form a closed space between the FRP pipe and the inner wall of the shield tunnel; S4. Grouting is performed from the grouting holes on the end plate to fill the closed space between the FRP pipe and the inner wall of the shield tunnel with concrete; S5. After the concrete solidifies, remove the end plates and the supporting parts inside the FRP pipe.

9. The method for preparing a fiberglass reinforced plastic liner for a shield tunnel in an ocean engineering according to claim 8, characterized in that: When the FRP pipe is spliced ​​in multiple sections, when the FRP pipe is pushed into the shield tunnel, the multiple sections of the FRP pipe are spliced ​​in advance and locked by connecting rods. When the spliced ​​FRP pipe reaches the specified position, the end plate is installed and grouting is performed.

10. The method for preparing a fiberglass reinforced plastic liner for a shield tunnel in an ocean engineering according to claim 8, characterized in that: When the FRP pipe is spliced ​​in multiple sections, first splice a single section or multiple sections, then send them to the designated position for grouting. After grouting, remove the end plate, insert the next section of the FRP pipe into the previous section of the FRP pipe, and install the end plate at the end of the FRP pipe away from the splicing point, and then inject grout.

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