A sea tunnel full waterproof threshold pressure relief drainage system and construction method

Abstract

The application provides a sea area tunnel full-pack waterproof threshold pressure relief drainage system and a construction method, the drainage system comprises a waterproof system and a drainage system; the waterproof system comprises a geotextile, a waterproof board and a waterproof roll, the drainage system comprises an annular drainage board arranged in a circumferential direction on an upper part of a radial section of the tunnel, an arch foot longitudinal drainage blind pipe distributed at a bottom of a side wall of the tunnel and arranged in a length direction of the tunnel, a side ditch arranged at the bottom of the side wall of the tunnel and a central drainage ditch arranged at a center position of a filling surface of a tunnel inverted arch, the arch foot longitudinal drainage blind pipe is connected to the side ditch, and the side ditch and the central drainage ditch are connected through a transverse drainage pipe. The application can be applied to the field of high water pressure sea area mine tunnels, effectively controls the in-hole drainage capacity through the full-pack waterproof concept, reduces the water pressure outside the tunnel through the threshold pressure relief technology, and balances the drainage capacity and the surrounding rock water pressure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of waterproof and drainage measures for mine tunnel in high water pressure sea area, and particularly relates to a full waterproof threshold pressure relief drainage system for sea area tunnel and a construction method. BACKGROUND

[0002] The existing mine tunnel adopts the concept of limited drainage (that is, water can enter the tunnel), which will cause excessive water pumping and drainage in the tunnel under the background of water-rich sea area, and high cost during operation. In addition, the pure full waterproof scheme of some tunnels will cause excessive water pressure outside the tunnel, which will cause great challenges to the durability and waterproof system of the tunnel lining. Therefore, it is an urgent problem to develop a full waterproof threshold pressure relief drainage system for sea area tunnel and a construction method. SUMMARY

[0003] Therefore, the present application aims to provide a full waterproof threshold pressure relief drainage system for sea area tunnel and a construction method, which can not only prevent water from entering the tunnel, but also reduce the water head when the water pressure reaches a certain threshold, so as to balance the water pumping and drainage.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0005] A full waterproof threshold pressure relief drainage system for sea area tunnel, comprising a waterproof system and a drainage system.

[0006] The waterproof system comprises geotextile, waterproof board and waterproof roll, the geotextile and the waterproof board are sequentially arranged between the initial support and the secondary lining of the tunnel, and the waterproof roll is arranged between the waterproof board and the secondary lining.

[0007] The drainage system comprises an annular drainage plate arranged circumferentially on the upper part of the radial section of the tunnel, an arch foot longitudinal drainage blind pipe arranged at the bottom of the side wall of the tunnel on both sides and along the length direction of the tunnel, a side ditch arranged at the bottom of the side wall of the tunnel on both sides, and a central drainage ditch arranged at the center position of the filling surface of the tunnel inverted arch, the arch foot longitudinal drainage blind pipe is connected to the side ditch, and the side ditch and the central drainage ditch are connected through a horizontal drainage pipe.

[0008] Further, the waterproof and drainage system further comprises an annular drainage blind pipe arranged at the inverted arch position of the tunnel, and an inverted arch longitudinal drainage blind pipe arranged at the center of the tunnel inverted arch, the annular drainage blind pipe and the inverted arch longitudinal drainage blind pipe are connected through a four-way pipe, the inverted arch longitudinal drainage blind pipe and the central drainage ditch are connected through a vertical blind pipe, and a detachable, adjustable threshold pressure relief valve is arranged at the upper end of the vertical blind pipe.

[0009] Further, the waterproofing membrane includes a circumferential waterproofing membrane and a longitudinal waterproofing membrane, which are arranged in cross-lap and form a waterproof sealing area.

[0010] Further, a 0.5m wide double-sided self-adhesive circumferential waterproofing membrane is arranged circumferentially at a distance of 1m from the circumferential construction joint of the tunnel, and a 0.5m wide double-sided self-adhesive longitudinal waterproofing membrane is arranged along the longitudinal direction of the tunnel at a distance of 0.5m from the longitudinal construction joint, the circumferential waterproofing membrane and the longitudinal waterproofing membrane are arranged in cross-lap, and the lap length is not less than 0.2m.

[0011] Further, a ring-shaped drainage plate is arranged in the waterproof sealing area formed by the waterproofing membrane on the tunnel arch wall, and the longitudinal drainage pipe at the arch foot is located in the waterproof sealing area, and the longitudinal distance between two adjacent ring-shaped drainage plates is consistent with the distance between the circumferential construction joints.

[0012] Further, the longitudinal drainage blind pipe at the arch foot is arranged in sections, and has openings at the upper part, each section has a length of 9m, and the two ends of each section of the longitudinal drainage blind pipe at the arch foot are connected with 90° elbows to lead the longitudinal drainage blind pipe at the arch foot into the side ditch.

[0013] Further, when the water pressure reaches a threshold value of 0.5Mpa, the pressure relief valve 13 automatically opens to drain the underground water into the central drainage ditch in the tunnel inverted arch filling surface.

[0014] Further, between every two circumferential construction joints outside the waterproofing plate in the range of the tunnel inverted arch, a ring-shaped drainage blind pipe and an inverted arch longitudinal drainage blind pipe are arranged, and the ring-shaped drainage blind pipe and the inverted arch longitudinal drainage blind pipe are connected through a four-way pipe.

[0015] A construction method of a full waterproofing threshold pressure relief and drainage system for a sea area tunnel, comprising the following steps:

[0016] Firstly, the stratum is grouted, the tunnel chamber is excavated and primary support is performed to form an anchor-shot primary support layer;

[0017] Secondly, after the surface of the primary support is leveled and finished, geotextile is applied, and waterproofing plates are applied to the tunnel arch wall and the inverted arch in the full ring, and the waterproofing plates on the arch wall and the inverted arch are sealed and welded at the arch foot position.

[0018] Thirdly, double-sided self-adhesive waterproofing membranes are applied to the inner surface of the waterproofing plates to form waterproof sealing areas between adjacent construction joints.

[0019] Fourthly, ring-shaped drainage plates and longitudinal drainage blind pipes at the arch foot are arranged in the sealing area of the waterproofing plates on the arch wall, and after the sealing of the waterproofing plates fails, the underground water can be introduced into the side ditch in the tunnel through the longitudinal drainage blind pipes at the arch foot.

[0020] Fifth step, in the tunnel inverted arch range waterproof plate outside, every two ring direction construction joint between set up a ring drainage blind pipe and a inverted arch longitudinal drainage blind pipe, two through four-way pipe connection; inverted arch longitudinal drainage blind pipe through vertical blind pipe with center drainage ditch communication, vertical blind pipe end set pressure relief valve;

[0021] Sixth step, in the waterproof drainage system quality inspection qualified, carry out self-compacting waterproof concrete structure, two lining structure pouring construction, through embedding transverse drainage pipe connection side ditch and center drainage ditch in the inverted arch filling part.

[0022] Further, in the fourth step, the waterproof layer is laid with ring longitudinal blind pipe drainage system, the ring longitudinal blind pipe drainage system includes ring direction concave-convex drainage plate and arch foot longitudinal drainage blind pipe, the ring direction concave-convex drainage plate is laid along the interval between the arch wall, and the arch foot longitudinal drainage blind pipe is laid between the bottom of two side walls.

[0023] Compared with the prior art, the sea area tunnel full waterproof threshold pressure relief drainage system and the construction method have the following advantages: the application can be applied to the high water pressure sea area mine tunnel field, the effective control of the in-hole drainage capacity is realized through the full waterproof concept, the peripheral water pressure of the tunnel is reduced through the threshold pressure relief technology, so that the drainage capacity and the surrounding rock water pressure are balanced; the concept of "equal importance of prevention and drainage, combination of prevention and drainage" is applied, the backwater pressure of the lining is controlled and reduced through the adjustable threshold pressure relief valve, the problem of excessive water pressure of the full sealing lining is avoided, and the problems of environment, resources and energy consumption of the full drainage lining are also avoided. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of this application, are used to provide further understanding of the application, and the illustrative embodiments of the application and their description serve to explain the application. The accompanying drawings do not constitute an inappropriate limitation on the application. In the drawings:

[0025] Figure 1 is a structural schematic diagram of the application;

[0026] Figure 2 is a detail schematic diagram of the geotextile and the waterproof plate in the application;

[0027] Figure 3 is a detail design schematic diagram of the drainage plate and the waterproof plate end in the application;

[0028] Figure 4 is a plane expansion diagram of the inverted arch range of the drainage system of the application in the sea area section;

[0029] Figure 5 is a plane expansion diagram of the arch wall range of the drainage system of the application in the sea area section;

[0030] Figure 6 is a schematic diagram of the setting of the ring drainage plate and the longitudinal blind pipe of the arch wall of the application.

[0031] Explanation of reference signs:

[0032] 01, Inverted arch filling surface; 02, Secondary lining; 03, Primary support;

[0033] 1, Geotextile; 2, Waterproof board; 3, Waterproof roll material; 3-1, Circumferential waterproof roll material; 3-2, Longitudinal waterproof roll material; 4, Annular drainage board; 5, Arch foot longitudinal drainage blind pipe; 6, Transverse drainage pipe; 7, Side ditch; 8, Center drainage ditch; 9, Annular drainage blind pipe; 10, Inverted arch longitudinal drainage blind pipe; 11, Four-way pipe; 12, Vertical blind pipe; 13, Pressure relief valve; 14, Circumferential construction joint; 15, Longitudinal construction joint; 16, Waterproof board connecting strip. DETAILED DESCRIPTION

[0034] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0035] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0036] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0038] A kind of sea area tunnel full package waterproof threshold pressure relief drainage system, the tunnel includes inverted arch filling face 01, secondary lining 02 and initial support 03 which are sequentially arranged from top to bottom.

[0039] As Figures 1 to 4 As shown in a kind of sea area tunnel full package waterproof threshold pressure relief drainage system, including waterproof system and drainage system.The waterproof system includes geotextile 1, waterproof board 2 and waterproof roll 3, the geotextile 1 and waterproof board 2 are sequentially arranged between the initial support 03 of tunnel and secondary lining 02, the waterproof roll 3 is arranged between waterproof board 2 and secondary lining 02, waterproof partition is isolated by waterproof roll 3, and the material of waterproof roll is PVC high molecular material.The drainage system includes annular drainage board 4 which is circumferentially arranged on the upper part of tunnel radial section, arch foot longitudinal drainage blind pipe 5 which is distributed at the bottom of side wall of tunnel both sides and is arranged along the length direction of tunnel, side ditch 7 which is arranged at the bottom of side wall of tunnel both sides, and center drainage ditch 8 which is arranged at the center position of tunnel inverted arch filling face 01, the arch foot longitudinal drainage blind pipe 5 is connected into side ditch 7, and the side ditch 7 is connected with center drainage ditch 8 by transverse drainage pipe 6.The drainage system also includes annular drainage blind pipe 9 which is arranged at the inverted arch position of tunnel, and inverted arch longitudinal drainage blind pipe 10 which is arranged at the center of tunnel inverted arch, and every two annular construction joints are provided with annular drainage blind pipe 9 and inverted arch longitudinal drainage blind pipe 10 outside waterproof board in the range of tunnel inverted arch, and the annular drainage blind pipe 9 is connected with inverted arch longitudinal drainage blind pipe 10 by four-way pipe 11.The inverted arch longitudinal drainage blind pipe 10 is connected with center drainage ditch 8 by vertical blind pipe 12, and the upper end of the vertical blind pipe 12 is provided with pressure relief valve 13 which is detachable, adjustable threshold value.When water pressure reaches 0.5Mpa threshold value, the pressure relief valve 13 automatically opens and drains underground water into the center drainage ditch in tunnel inverted arch filling face 01.

[0040] As Figure 5 As shown in the waterproof roll 3 includes annular waterproof roll 3-1 and longitudinal waterproof roll 3-2, and the annular waterproof roll 3-1 and longitudinal waterproof roll 3-2 are cross-lapped to set up, and form waterproof sealed area.Specifically, 0.5m wide double-sided self-adhesive annular waterproof roll 3-1 is arranged in the range of arch wall along the annular direction at 1m from the annular construction joint of tunnel, and 0.5m wide double-sided self-adhesive longitudinal waterproof roll 3-2 is arranged along the longitudinal direction of tunnel at 0.5m from longitudinal construction joint, the annular waterproof roll 3-1 and longitudinal waterproof roll 3-2 are cross-lapped to set up, and the overlapping length is not less than 0.2m.

[0041] As Figure 6As shown, a waterproof sealing area surrounded by waterproof coiled material is provided with an annular drainage plate 4 on the tunnel arch wall, and the arch foot longitudinal drainage blind pipe 5 is located in the waterproof sealing area, and the longitudinal spacing of adjacent two annular drainage plates 4 is consistent with the spacing of the annular construction joint. The arch foot longitudinal drainage blind pipe 5 is provided in sections, and an opening is provided at the upper portion thereof, and the length of each section is 9m, and the two ends of each section of the arch foot longitudinal drainage blind pipe 5 are connected with 90° elbows, and the arch foot longitudinal drainage blind pipe 5 is connected into the side ditch.

[0042] As shown, Figure 3 As shown, the waterproof plate connecting strip 16 connected with the waterproof plate 2 surrounds the arch foot longitudinal drainage blind pipe 5 in the waterproof sealing area.

[0043] A construction method of a full-pack waterproof threshold pressure relief and drainage system of a sea area tunnel, comprising the following steps:

[0044] Firstly, the stratum is grouted, the tunnel chamber is excavated, and initial support operation is performed to form an anchor-shot initial support layer.

[0045] Specifically, taking a circular tunnel with an outer diameter of 14.68m as an example. Before excavation, the stratum is grouted to reduce the permeability of the surrounding rock, and then the tunnel chamber is excavated, a reasonable sub-excavation process and anchor rod (anchor cable, etc.) support measures are selected, and C35 high-performance concrete is sprayed on the arch and side wall of the tunnel chamber to form an anchor-shot initial support layer.

[0046] Secondly, after the surface of the initial support is leveled and finished, geotextile is applied first, and then waterproof plates 2 are applied on the tunnel arch wall and the full ring of the inverted arch. The arch wall waterproof plate and the inverted arch waterproof plate are sealed and welded at the arch foot position.

[0047] Specifically, the waterproof plate 2 can be laid only when the excavation surface is flat. When the blasting and cleaning effect cannot meet the requirements, a 5cm-10cm thick cement mortar leveling layer is provided in combination with the over-excavation of the inverted arch to avoid the waterproof plate being punctured.

[0048] Thirdly, double-sided self-adhesive waterproof coiled material 3 is applied on the inner surface of the waterproof plate 2 to form a waterproof isolation area between adjacent construction joints.

[0049] Specifically, 0.5m wide double-sided self-adhesive annular waterproof coiled material 3-1 is arranged in the range of the arch wall at a distance of 1m from the annular construction joint 14, and 0.5m wide double-sided self-adhesive longitudinal waterproof coiled material 3-2 is arranged along the longitudinal direction at a distance of 0.5m from the longitudinal construction joint. One side of the above-mentioned waterproof coiled material 3 is bonded with the waterproof plate 2, and the other side is bonded with the secondary lining 02. The annular waterproof coiled material 3-1 and the longitudinal waterproof coiled material 3-2 are cross-lapped, and the lap length is not less than 0.2m to form a waterproof sealing area. An independent partitioned drainage system in the range of the arch wall is formed in units of plate trolley lengths, and the subsequent local position leakage is easy to locate and rectify.

[0050] Fourth step, the arch wall waterproof board sealing area is provided with an annular drainage plate 4 and two arch foot longitudinal drainage blind pipes 5, and after the failure of the waterproof board sealing, underground water can be introduced into the side ditch through the arch foot longitudinal drainage blind pipe 5.

[0051] Specifically, the waterproof layer is provided with a ring-longitudinal blind pipe drainage system, the ring-longitudinal blind pipe drainage system comprises a ring-shaped concave-convex drainage plate and a 80mm DG anti-crystallization arch foot longitudinal drainage blind pipe 5, the ring-shaped concave-convex drainage plate is laid along the interval between the arch walls, and the arch foot longitudinal drainage blind pipe 5 is laid between the bottoms of the two side walls.

[0052] The longitudinal spacing of the adjacent 0.5m wide convex shell type drainage plate is 12m, which is consistent with the spacing of the ring-shaped construction joints. The arch foot longitudinal drainage blind pipe 5 is provided in sections, and the upper part is provided with an opening. Each section has a length of 9m, and the two ends are provided with 90° elbows to enter the side ditch.

[0053] Fifth step, outside the waterproof board in the range of the tunnel inverted arch, one annular drainage blind pipe 9 and one inverted arch longitudinal drainage blind pipe 10 are arranged between every two ring-shaped construction joints, and the two are connected through a four-way pipe 11. The inverted arch longitudinal drainage blind pipe 10 is communicated with the central drainage ditch 8 through a vertical blind pipe 12, and a detachable adjustable threshold pressure relief valve 13 is arranged at the end of the vertical blind pipe 12. The product model of the pressure relief valve 13 is A41H spring type pressure relief valve.

[0054] Specifically, the inner diameter of the 80mm DG anti-crystallization inverted arch longitudinal drainage blind pipe 10 and the annular drainage blind pipe 9 are arranged between the waterproof board in the middle of each plate trolley and the inverted arch lining, and the adjustable threshold pressure relief valve 13 is arranged in the center ditch (low end) of each plate inverted arch. The inner diameter of the 80mm DG anti-crystallization vertical drainage blind pipe 12 is connected with the inverted arch longitudinal drainage blind pipe 10. When the water pressure reaches 0.5Mpa threshold, the pressure relief valve 13 automatically opens to drain underground water into the central drainage ditch 8 in the tunnel, which controls the discharge of underground water and reduces the water pressure of surrounding rock.

[0055] Sixth step, after the quality inspection of the waterproof and drainage system is qualified, the self-compacting waterproof concrete structure and the secondary lining structure are poured and constructed, and the horizontal drainage pipe 6 is embedded in the inverted arch filling part to connect the side ditch 7 and the central drainage ditch 8.

[0056] Specifically, the side ditch 7 is connected with the central water ditch through the horizontal PVC drainage pipe with an inner diameter of 100mm and a spacing of 10m. Specifically, the secondary lining structure in the waterproof system is self-compacting high-performance waterproof concrete, which has high flowability and compactness, high durability, high impermeability, better waterproof performance, and can further improve the waterproof and drainage quality of the sea tunnel.

[0057] The present application can be applied to the field of mine tunnel in high water pressure sea area, multiple waterproofs are arranged in the whole ring of the tunnel, that is, the full waterproof is realized by adopting "grouting ring + anti-seepage primary support + full waterproof plate + C50 high-grade anti-seepage concrete formwork secondary lining", the effective control of the drainage capacity in the hole is realized through the full waterproof concept; at the same time, the pressure relief valve is arranged at the inverted arch part, the reduction of the water pressure outside the tunnel is realized through the threshold pressure relief technology, so as to balance the drainage capacity and the water pressure of the surrounding rock.

[0058] The concept of "equal importance of prevention and drainage and combination of prevention and drainage" is applied, the adjustable threshold pressure relief valve is used to control and reduce the water pressure on the back of the lining, the problem of too large water pressure of the fully blocked lining is avoided, and the problems of environment, resources and energy consumption of the fully drained lining are also avoided.

[0059] Before excavation, the stratum is grouted to reduce the permeability of the surrounding rock, so that the internal part of the surrounding rock is cemented and dense, the anti-seepage ability of the surrounding rock is enhanced, the surrounding rock protection circle layer formed plays a role of blocking the seepage path of underground water, reduces the collection and seepage of underground water to the tunnel area, and can significantly reduce the water pressure outside the tunnel.

[0060] The waterproof layer taking the waterproof plate as the main body is arranged between the primary support and the secondary lining, plays a role of isolating lubrication, avoids the surface cracking of the secondary lining concrete caused by additional stress such as temperature stress and shrinkage stress in the hardening process of the secondary lining concrete, and ensures the waterproof function of the concrete itself.

[0061] The double-sided self-adhesive waterproof coiled material arranged between the waterproof plate and the secondary lining divides the tunnel into waterproof partitions, the seepage water passing through the waterproof layer is discharged in time by the ring-shaped drainage plate, and the seepage water is prevented from flowing along the longitudinal direction of the tunnel behind the secondary lining and leaking to the tunnel clearance from the weak links such as construction joints.

[0062] The above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A construction method for a fully enclosed waterproof threshold pressure relief and drainage system for marine tunnels, characterized in that: Including waterproofing and drainage systems; The waterproofing system includes geotextile, waterproof membrane, and waterproof roll material. The geotextile and waterproof membrane are sequentially installed between the initial support and the secondary lining of the tunnel, and the waterproof roll material is installed between the waterproof membrane and the secondary lining. The drainage system includes annular drainage boards arranged circumferentially along the upper part of the tunnel's radial cross-section, longitudinal drainage blind pipes at the arch foot distributed at the bottom of the sidewalls on both sides of the tunnel and arranged along the tunnel's length, side ditches at the bottom of the sidewalls on both sides of the tunnel, and a central drainage ditch located at the center of the tunnel's invert arch filling surface. The longitudinal drainage blind pipes at the arch foot lead into the side ditches, and the side ditches are connected to the central drainage ditch through transverse drainage pipes. Annular drainage boards are installed in the waterproof sealing area formed by waterproof membrane on the tunnel arch wall. The longitudinal drainage blind pipes at the arch foot are located within the waterproof sealing area. The longitudinal spacing between two adjacent annular drainage boards is consistent with the spacing of the circumferential construction joint. After the waterproof membrane seal fails, groundwater can be introduced into the side ditches inside the tunnel through the longitudinal drainage blind pipes at the arch foot. The drainage system also includes an annular drainage blind pipe installed in the tunnel invert and a longitudinal drainage blind pipe installed at the center of the tunnel invert. Outside the waterproofing slab in the tunnel invert area, there is an annular drainage blind pipe and a longitudinal drainage blind pipe between every two circumferential construction joints. The annular drainage blind pipe is connected to the longitudinal drainage blind pipe of the invert through a four-way pipe. The longitudinal drainage blind pipe of the invert is connected to the central drainage pipe through a vertical blind pipe. A pressure relief valve is provided at the upper end of the vertical blind pipe. The waterproof membrane includes a circumferential waterproof membrane and a longitudinal waterproof membrane, which are interlocked to form a waterproof sealing area. The construction method includes the following steps: The first step is to grout the strata, excavate the tunnel chamber and carry out initial support operations to form the initial anchor-sprayed support layer. The second step is to level and finish the surface of the initial support, then apply geotextile first, and then apply waterproof membrane to the entire ring of the tunnel arch and invert. The waterproof membrane of the arch and the waterproof membrane of the invert are sealed and welded at the arch foot. The third step is to apply a double-sided self-adhesive waterproof membrane to the inner surface of the waterproof membrane to form a waterproof seal between adjacent construction joints. The fourth step is to install a ring-shaped drainage board and a longitudinal drainage blind pipe at the arch foot within the sealed area of ​​the waterproof membrane of the arch wall. After the waterproof membrane fails to seal, groundwater can be introduced into the side ditch inside the tunnel through the longitudinal drainage blind pipe at the arch foot. Fifth step: On the outside of the waterproof membrane in the tunnel arch area, a ring-shaped drainage blind pipe and a longitudinal drainage blind pipe for the invert arch are installed between every two circumferential construction joints. The two are connected by a four-way pipe. The longitudinal drainage blind pipe for the invert arch is connected to the central drainage ditch through a vertical blind pipe. A pressure relief valve is installed at the end of the vertical blind pipe. The sixth step is to carry out the construction of self-compacting waterproof concrete structure and secondary lining structure after the drainage system has passed quality inspection. The side ditch and central drainage ditch are connected by burying transverse drainage pipes in the invert arch filling part.

2. The construction method of a fully enclosed waterproof threshold pressure relief and drainage system for marine tunnels according to claim 1, characterized in that: A 0.5m wide circumferential waterproof membrane is installed on the arch wall 1m away from the circumferential construction joint of the tunnel, and a 0.5m wide longitudinal waterproof membrane is installed along the longitudinal direction of the tunnel 0.5m away from the longitudinal construction joint. The circumferential and longitudinal waterproof membranes are interleaved, and the overlap length is not less than 0.2m.

3. The construction method of a fully enclosed waterproof threshold pressure relief and drainage system for marine tunnels according to claim 1, characterized in that: The longitudinal drainage blind pipe at the arch foot is set in sections, and an opening is provided at the top of each section. Both ends of each section of the longitudinal drainage blind pipe at the arch foot are connected to a 90° elbow, so that the longitudinal drainage blind pipe at the arch foot can be connected to the side ditch.

4. The construction method of a fully enclosed waterproof threshold pressure relief and drainage system for marine tunnels according to claim 1, characterized in that: When the water pressure reaches the 0.5 MPa threshold, the pressure relief valve automatically opens to discharge groundwater into the central drainage ditch within the tunnel invert arch filling surface.

5. The construction method of a fully enclosed waterproof threshold pressure relief and drainage system for marine tunnels according to claim 1, characterized in that: In the fourth step, a circumferential longitudinal blind pipe drainage system is laid on the waterproof layer. The circumferential longitudinal blind pipe drainage system includes circumferential concave-convex drainage boards and longitudinal drainage blind pipes at the arch foot. The circumferential concave-convex drainage boards are laid at intervals along the arch wall, and the longitudinal drainage blind pipes at the arch foot are laid between the bottom of the two side walls.

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