CN115539127A - Sea area tunnel full-wrapping waterproof threshold pressure-relief water-proof and drainage-proof system and construction method - Google Patents

Abstract

The invention provides an all-inclusive waterproof threshold pressure relief and waterproof drainage system and construction method for sea area tunnels. The waterproof and drainage system includes a waterproof system and a drainage system; The annular drainage boards arranged circumferentially on the upper part of the section, the vertical drainage blind pipes arranged at the bottom of the side walls on both sides of the tunnel and arranged along the length of the tunnel, the side ditches arranged at the bottom of the side walls on both sides of the tunnel, and the vertical drainage pipes arranged at the bottom of the tunnel on both sides The central drainage ditch at the center of the arch filling surface, the vertical drainage blind pipe at the foot of the arch leads to the side ditch, and the side ditch is connected to the central drainage channel through a horizontal drainage pipe. The invention can be applied to the field of mine tunnels in high water pressure sea areas. The water discharge in the tunnel can be effectively controlled through the all-inclusive waterproof concept, and the water pressure at the periphery of the tunnel can be reduced through the threshold pressure relief technology, thereby balancing the water discharge and surrounding rock water pressure.

Description

An all-inclusive waterproof threshold pressure relief waterproof and drainage system and construction method for sea tunnels

technical field

The invention relates to the field of water-proof and drainage measures for sea-area mining tunnels under high water pressure conditions, and in particular to an all-inclusive water-proof threshold pressure relief and water-proof drainage system for sea area tunnels and a construction method.

Background technique

Most of the existing mining tunnels adopt the concept of limited discharge (that is, water can enter the tunnel). Under the background of rich water in the sea, the pumping and drainage volume in the tunnel will be too large, and the cost during operation will be high. In addition, the purely all-inclusive waterproofing scheme for some tunnels will lead to excessive water pressure on the periphery of the tunnel, posing a great challenge to the durability of the tunnel lining and the waterproofing system. Therefore, it is an urgent problem to be solved to develop an all-inclusive waterproof threshold pressure relief waterproof and drainage system and construction method for sea tunnels.

Contents of the invention

In view of this, the present invention aims to propose an all-inclusive waterproof threshold pressure relief, waterproof and drainage system and construction method for sea area tunnels. When , reduce the pressure of the water head to achieve the balance of displacement and water pressure.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

An all-inclusive waterproof threshold pressure relief waterproof and drainage system for sea tunnels, including a waterproof system and a drainage system;

The waterproof system includes a geotextile, a waterproof board and a waterproof coil, the geotextile and the waterproof board are sequentially arranged between the primary support and the secondary lining of the tunnel, and the waterproof coil is arranged between the waterproof board and the secondary lining between;

The drainage system includes an annular drainage plate arranged along the upper circumferential direction of the radial section of the tunnel, longitudinal drainage blind pipes arranged at the bottom of the sidewalls on both sides of the tunnel and arranged along the length direction of the tunnel, and arranged at the bottom of the sidewalls on both sides of the tunnel. The side ditch, and the central drainage ditch arranged at the center of the filling surface of the tunnel invert, the vertical drainage blind pipe at the arch foot leads into the side ditch, and the side ditch is connected to the central drainage ditch through a horizontal drainage pipe.

Further, the waterproof and drainage system also includes an annular blind drainage pipe arranged at the inverted arch of the tunnel, and an inverted vertical drainage blind pipe arranged at the center of the tunnel inverted arch. Connected by a four-way pipe, the vertical blind pipe of the inverted arch is connected with the central drainage channel through a vertical dead pipe, and a detachable pressure relief valve with an adjustable threshold is provided at the upper end of the vertical dead pipe .

Further, the waterproof coiled material includes a hoop waterproof coiled material and a longitudinal waterproof coiled material, and the hooped waterproof coiled material and the longitudinal waterproof coiled material are intersected and overlapped to form a waterproof sealing area.

Further, a 0.5m wide double-sided self-adhesive circumferential waterproof membrane is installed in the arch wall at a distance of 1m from the tunnel circumferential construction joint, and a 0.5m wide double-sided waterproof membrane is installed along the longitudinal direction of the tunnel at a distance of 0.5m from the longitudinal construction joint. Self-adhesive longitudinal waterproof membrane, the circumferential waterproof membrane and the longitudinal waterproof membrane are overlapped, and the overlapping length is not less than 0.2m.

Further, an annular drainage board is provided in the waterproof sealing area surrounded by the waterproof coiled material on the arch wall of the tunnel, and the longitudinal drainage pipe of the arch foot is located in the waterproof sealing area, and two adjacent annular drains The longitudinal spacing of the slabs is consistent with the spacing of the circumferential construction joints.

Further, the vertical drainage blind pipe of the arch foot is arranged in sections, and an opening is arranged on the upper part thereof, each section has a length of 9m, and the two ends of the vertical drainage blind pipe of the arch foot of each section are connected with a 90° elbow Connected, and the vertical drainage blind pipe of the arch foot is connected to the side ditch.

Further, when the water pressure reaches the threshold of 0.5Mpa, the pressure relief valve 13 is automatically opened to discharge the groundwater into the central drainage ditch in the filling surface of the tunnel invert.

Further, on the outside of the waterproof plate in the tunnel inversion range, an annular blind drainage pipe and an inverted vertical drainage blind pipe are arranged between every two circumferential construction joints, and the annular blind drainage pipe and the vertical drainage blind pipe in the inverted arch Connected by four-way pipe.

A construction method for an all-inclusive waterproof threshold pressure relief, waterproof and drainage system for a sea tunnel, comprising 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 support layer of bolting and spraying;

In the second step, after leveling and finishing the surface of the initial support, first apply geotextiles, and then apply waterproof boards on the tunnel arch wall and the entire ring of the inverted arch. The arch wall waterproof board and the inverted arch waterproof board are sealed and welded at the arch foot ;

The third step is to apply a double-sided self-adhesive waterproof membrane on the inner surface of the waterproof board to form a waterproof sealing area between adjacent construction joints;

The fourth step is to set the annular drainage board and the vertical drainage blind pipe of the arch foot in the sealing area of the waterproof board of the arch wall. After the sealing of the waterproof board fails, the groundwater can be introduced into the inner ditch of the cave through the vertical drainage blind pipe of the arch foot;

Step 5: On the outer side of the waterproof board in the inverted arch range of the tunnel, an annular drainage blind pipe and an inverted vertical drainage blind pipe are arranged between every two circumferential construction joints, and the two are connected by a four-way pipe; the inverted arch longitudinal drainage blind pipe The pipe communicates with the central drainage ditch through a vertical blind pipe, and a pressure relief valve is installed at the end of the vertical blind pipe;

The sixth step is to carry out the pouring construction of the self-compacting waterproof concrete structure and the secondary lining structure after the quality inspection of the waterproof and drainage system, and connect the side ditch and the central drainage ditch by laying horizontal drainage pipes in the inverted arch filling part.

Further, in the fourth step, a circular vertical blind pipe drainage system is laid on the waterproof layer. The circular longitudinal blind pipe drainage system includes a circular concave-convex drainage board and a longitudinal blind pipe with arch feet. The arch walls are laid at intervals, and the longitudinal drainage blind pipes of the arch feet are laid between the bottoms of the two side walls.

Compared with the prior art, the all-inclusive waterproof threshold pressure relief, waterproof and drainage system and construction method of the sea tunnel described in the present invention have the following advantages: the present invention can be applied to the field of mine tunnels in high water pressure sea areas, and realize the construction of the tunnel through the all-inclusive waterproof concept. Effective control of displacement, through the threshold pressure relief technology to reduce the water pressure outside the tunnel, so as to balance the displacement and surrounding rock water pressure; apply the concept of "equal attention to drainage and combination of prevention and drainage", and control through the adjustable threshold pressure relief valve And reduce the backwater pressure of the lining, avoiding the problem of excessive water pressure of the fully blocked lining, and also avoiding the environment, resources, and energy consumption of the fully drained lining.

Description of drawings

The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a detailed schematic diagram of geotextile and waterproof board in the present invention;

Fig. 3 is a schematic diagram of the detailed design of the end of the drainage board and the waterproof board in the present invention;

Fig. 4 is a plane expansion diagram of the range of the inverted arch of the waterproof and drainage system of the present invention in the sea area section;

Fig. 5 is a plane expansion diagram of the range of arch walls laid out by the waterproof and drainage system of the present invention in the sea area section;

Fig. 6 is a schematic diagram of the arrangement of the ring-shaped drainage plate and the vertical blind pipe of the arch wall of the present invention.

Explanation of reference signs:

01. Inverted arch filling surface; 02. Secondary lining; 03. Primary support;

1. Geotextile; 2. Waterproof board; 3. Waterproof membrane; 3-1. Circular waterproof membrane; 3-2. Longitudinal waterproof membrane; 4. Ring drainage board; 6. Horizontal drainage pipe; 7. Side ditch; 8. Central drainage ditch; 9. Annular drainage blind pipe; 10. Inverted vertical 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

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, a feature defined as "first", "second", etc. may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention based on specific situations.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

An all-inclusive waterproof threshold pressure relief, waterproof and drainage system for sea area tunnels, the tunnel includes an inverted arch filling surface 01, secondary lining 02 and primary support 03 arranged in sequence from top to bottom.

As shown in Figures 1 to 4, an all-inclusive waterproof threshold pressure relief waterproof and drainage system for sea tunnels includes a waterproof system and a drainage system. The waterproof system includes a geotextile 1, a waterproof board 2 and a waterproof coiled material 3. The geotextile 1 and the waterproof board 2 are sequentially arranged between the primary support 03 and the secondary lining 02 of the tunnel. The waterproof coiled material 3 It is arranged between the waterproof board 2 and the secondary lining 02, and the waterproof partition is isolated by the waterproof coiled material 3, and the material of the waterproof coiled material is PVC polymer material. The drainage system includes an annular drainage plate 4 arranged circumferentially along the upper part of the radial cross-section of the tunnel, a vertical drainage blind pipe 5 arranged at the bottom of the side walls on both sides of the tunnel and arranged along the length direction of the tunnel, and a vertical drainage pipe 5 arranged on both sides of the tunnel. The side ditch 7 at the bottom of the wall, and the central drainage ditch 8 arranged at the center of the tunnel inverted arch filling surface 01, the vertical drainage blind pipe 5 at the arch foot leads into the side ditch 7, and the side ditch 7 and the central drainage ditch 8 pass through Horizontal drainage pipe 6 is connected. The waterproof and drainage system also includes an annular drainage blind pipe 9 arranged at the tunnel invert, and an inverted vertical drainage blind pipe 10 arranged at the center of the tunnel invert. An annular blind drain pipe 9 and an inverted vertical blind drain pipe 10 are arranged between the construction joints, and the annular blind drain pipe 9 and the inverted vertical blind drain pipe 10 are connected through a four-way pipe 11 . The vertical dead pipe 10 of the inverted arch is connected to the central drainage ditch 8 through a vertical dead pipe 12 , and a detachable pressure relief valve 13 with an adjustable threshold is provided at the upper end of the vertical dead pipe 12 . When the water pressure reaches the threshold of 0.5Mpa, the pressure relief valve 13 is automatically opened to discharge the groundwater into the central drainage ditch in the filling surface 01 of the tunnel invert.

As shown in Figure 5, the waterproof membrane 3 includes a hoop waterproof membrane 3-1 and a longitudinal waterproof membrane 3-2, the hoop waterproof membrane 3-1 and the longitudinal waterproof membrane 3-2 overlap Set up directly to form a waterproof sealing area. Specifically, a 0.5m-wide double-sided self-adhesive circumferential waterproof membrane 3-1 is installed in the arch wall at a distance of 1m from the circumferential construction joint of the tunnel, and 0.5m is installed along the longitudinal direction of the tunnel at a distance of 0.5m from the longitudinal construction joint. Wide double-sided self-adhesive longitudinal waterproof roll material 3-2, the circumferential waterproof roll material 3-1 and the longitudinal waterproof roll material 3-2 are cross-overlapped, and the overlapping length is not less than 0.2m.

As shown in Figure 6, an annular drainage plate 4 is provided in the waterproof sealing area surrounded by waterproof coiled materials on the arch wall of the tunnel, and the vertical drainage blind pipe 5 of the arch foot is located in the waterproof sealing area. The longitudinal distance between two adjacent annular drainage boards 4 is consistent with the distance between the circumferential construction joints. The vertical drainage blind pipe 5 of the arch foot is arranged in sections, and an opening is arranged on the upper part thereof, the length of each section is 9m, and the two ends of the vertical drainage blind pipe 5 of the arch foot of each section are connected with a 90° elbow , the vertical drainage blind pipe 5 of the arch foot is passed into the side ditch.

As shown in FIG. 3 , in the waterproof sealing area, the waterproof board connecting strip 16 connected with the waterproof board 2 surrounds the longitudinal blind pipe 5 of the arch foot.

A construction method for an all-inclusive waterproof threshold pressure relief waterproof and drainage system for sea tunnels, comprising 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 support layer of bolting and spraying.

Specifically, take a circular tunnel with an outer diameter of 14.68m as an example. Before the excavation, the permeability of the surrounding rock is reduced by grouting the ground, and then the excavation of the tunnel chamber is carried out. The side wall is sprayed with C35 high-performance concrete to form the initial support layer of anchor shotcrete.

In the second step, after leveling and finishing the surface of the initial support, first apply geotextiles, and then apply waterproof board 2 on the tunnel arch wall and the entire ring of the inverted arch. The arch wall waterproof board and the inverted arch waterproof board are sealed at the arch foot welding.

Specifically, it is necessary to ensure that the excavation surface is flat before laying the waterproof board 2 . When the blasting and cleaning effects are difficult to meet the requirements, a 5cm-10cm thick cement mortar leveling layer shall be set in combination with the over-excavation of the inverted arch to avoid the waterproof board being punctured.

The third step is to apply a double-sided self-adhesive waterproof roll material 3 on the inner surface of the waterproof board 2 to form a waterproof isolation area between adjacent construction joints.

Specifically, a 0.5m wide double-sided self-adhesive circumferential waterproof membrane 3-1 is installed in the arch wall at a distance of one meter from the circumferential construction joint 14, and a 0.5m wide Double-sided self-adhesive longitudinal waterproof roll material 3-2, the above waterproof roll material 3 is bonded to the waterproof board 2 on one side and bonded to the secondary lining 02 on the other side. The circumferential waterproof membrane 3-1 is overlapped with the longitudinal waterproof membrane 3-2, and the overlapping length is not less than 0.2m to form a waterproof sealing area. Form an independent partition waterproof and drainage system for the arch wall range based on the length of each pallet trolley, so that it is easy to locate and rectify after water leakage occurs in subsequent local locations.

In the fourth step, an annular drainage board 4 and two longitudinal drainage blind pipes 5 at the arch feet are arranged within the sealing area of the waterproof board of the arch wall. After the sealing of the waterproof board fails, groundwater can be introduced into the inner ditch of the cave through the longitudinal blind pipes 5 at the arch feet.

Specifically, a circular vertical blind pipe drainage system is laid on the waterproof layer. The circular vertical blind pipe drainage system includes a circular concave-convex drainage board and an 80mmDG anti-crystallization arch foot vertical drainage blind pipe 5. The circular concave-convex drainage board runs along the arch wall It is laid at intervals, and the vertical drainage blind pipe 5 of the arch foot is laid between the bottoms of the two side walls.

Among them, the longitudinal spacing of adjacent 0.5m wide convex shell drainage boards is 12m, which is consistent with the spacing of circumferential construction joints. The vertical drainage blind pipe 5 of the arch foot is arranged in sections, and the upper part is provided with openings. The length of each section is 9m, and 90° elbows are provided at both ends to lead into the side ditch.

In the fifth step, on the outside of the waterproof board in the inverted arch range of the tunnel, an annular blind drainage pipe 9 and an inverted vertical drainage blind pipe 10 are arranged between every two circumferential construction joints, and the two are connected by a four-way pipe 11 . The vertical blind pipe 10 of the inverted arch communicates with the central drainage ditch 8 through the vertical dead pipe 12, and the end of the vertical dead pipe 12 is provided with a detachable adjustable threshold pressure relief valve 13, and the product model of the pressure relief valve 13 is A41H Spring loaded pressure relief valve.

Specifically, an inner diameter of 80mm DG anti-crystallization vertical drainage blind pipe 10 and a ring-shaped drainage blind pipe 9 are set between the waterproof board in the middle of each pallet and the inverted arch lining, and in the center ditch (lower end) of each board inverted arch An adjustable threshold pressure relief valve 13 is provided, and is connected to the vertical vertical drainage blind pipe 10 of the inverted arch through an anti-crystallization vertical dead pipe 12 with an inner diameter of 80mmDG. When the water pressure reaches the threshold of 0.5Mpa, the pressure relief valve 13 is automatically opened to discharge groundwater into the central drainage ditch 8 in the cave, thereby reducing the surrounding rock water pressure while controlling groundwater discharge.

In the 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 the lateral drainage pipe 6 is buried in the inverted arch filling part to connect the side ditch 7 and the central drainage ditch 8 .

Specifically, the side ditch 7 is connected to the central gutter through transverse PVC drainage pipes with an inner diameter of 100 mm at a distance of 10 m. Specifically, the secondary lining structure in the waterproof system is self-compacting high-performance waterproof concrete. Compared with conventional ordinary waterproof concrete, it has high fluidity and compactness, high durability, high impermeability, and better waterproof performance. Further improve the waterproof and drainage quality of sea tunnels.

The present invention can be applied to the field of mine tunnels in high-water-pressure sea areas, and multiple waterproofing channels are installed in the entire ring of the tunnel, that is, "grouting ring + impermeable primary support + all-inclusive waterproof board + C50 high-grade impermeable concrete molded second lining" Realize all-inclusive waterproofing, and realize effective control of the drainage in the tunnel through the concept of all-inclusive waterproofing; at the same time, set a pressure relief valve at the inverted arch, and realize the reduction of the peripheral water pressure of the tunnel through the threshold pressure relief technology, so as to balance the drainage and surrounding rock water pressure.

Applying the concept of "equal emphasis on anti-drainage and combination of anti-drainage", the adjustable threshold pressure relief valve is used to control and reduce the backwater pressure of the lining, which avoids the problem of excessive water pressure in the fully blocked lining and also avoids the problem of full drainage lining environment, resources, and energy consumption.

Before excavation, the permeability of the surrounding rock is reduced by grouting the ground, so that the interior of the surrounding rock can be cemented and compacted, and the anti-seepage ability of the surrounding rock can be enhanced. The formed surrounding rock protection circle can block the groundwater seepage passage. , reducing the collection and seepage of groundwater to the tunnel area, which can significantly reduce the water pressure outside the tunnel.

The waterproof layer with the waterproof board as the main body is set between the primary support and the secondary lining, which plays the role of isolation and lubrication, and avoids the concrete surface tension caused by the additional stress such as temperature stress and shrinkage stress during the hardening process of the secondary lining concrete. Cracks ensure the waterproofing effect of the concrete itself.

The double-sided self-adhesive waterproof membrane installed between the waterproof board and the secondary lining divides the tunnel into waterproof partitions. The seepage water passing through the waterproof layer is discharged in time by the circular drainage board to prevent water seepage along the tunnel behind the secondary lining. Longitudinal flow and leakage from weak links such as construction joints to the tunnel clearance.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. The utility model provides a waterproof threshold pressure release drainage system is prevented in sea area tunnel complete package which characterized in that: comprises a waterproof system and a drainage system;

the waterproof system comprises geotextile, a waterproof board and a waterproof coiled material, wherein the geotextile and the waterproof board are sequentially arranged between a primary support and a secondary lining of the tunnel, and the waterproof coiled material is arranged between the waterproof board and the secondary lining;

drainage system includes the annular drain bar that sets up along tunnel radial cross section upper portion circumference, distributes in the vertical drainage blind pipe of hunch foot that the side wall bottom of tunnel both sides just set up along tunnel length direction, sets up in the side ditch of tunnel both sides side wall bottom and set up in the central escape canal that tunnel invert filling surface central point put, the vertical drainage blind pipe of hunch foot lets in the side ditch, the side ditch links to each other through horizontal drain pipe with the central escape canal.

2. The all-covered waterproof threshold pressure-relief water-proof and drainage system for the sea area tunnel according to claim 1, which is characterized in that: this drainage system still including setting up in the annular drainage blind pipe of tunnel invert to and set up in the vertical drainage blind pipe of invert at tunnel invert center department, the annular drainage blind pipe passes through the four-way pipe with the vertical drainage blind pipe of invert and links to each other, the vertical drainage blind pipe of invert passes through vertical blind union coupling with central escape canal the upper portion end of vertical blind pipe is equipped with the relief valve.

3. The all-covered waterproof threshold pressure-relief water-proof and drainage system for the sea area tunnel according to claim 1 or 2, which is characterized in that: the waterproof roll comprises a circumferential waterproof roll and a longitudinal waterproof roll, wherein the circumferential waterproof roll and the longitudinal waterproof roll are in cross lap joint to form a waterproof sealing area.

4. The all-covered waterproof threshold pressure-relief water-proof and drainage system for the sea area tunnel according to claim 3, characterized in that: set up the hoop waterproofing membrane of 0.5m width in the arch wall hoop direction apart from tunnel hoop construction joint 1m, set up the wide vertical waterproofing membrane of 0.5m along tunnel longitudinal direction apart from vertical construction joint 0.5m department, hoop waterproofing membrane and vertical waterproofing membrane alternately overlap joint set up, and overlap joint length is not less than 0.2m.

5. The all-covered waterproof threshold pressure-relief water-proof and drainage system for the sea area tunnel according to claim 3, characterized in that: the tunnel encircles all to be equipped with one annular drain bar in the waterproof sealing district that encloses by waterproofing membrane on the wall, the longitudinal drain pipe of hunch foot is located in the waterproof sealing district, the longitudinal separation of two adjacent annular drain bars is unanimous with the interval of hoop construction joint.

6. The all-covered waterproof threshold pressure-relief water-proof and drainage system for the sea area tunnel according to claim 5, characterized in that: the arch foot longitudinal drainage blind pipe is arranged in a subsection mode, an opening is formed in the upper portion of the arch foot longitudinal drainage blind pipe, two ends of each arch foot longitudinal drainage blind pipe are connected with 90-degree elbows, and the arch foot longitudinal drainage blind pipe is led into the side ditch.

7. The all-covered waterproof threshold pressure-relief water-proof and drainage system for the sea area tunnel according to claim 1, which is characterized in that: and when the water pressure reaches a threshold value of 0.5Mpa, the pressure release valve automatically opens to discharge the underground water into a central drainage ditch in the filling surface of the inverted arch of the tunnel.

8. The all-covered waterproof threshold pressure-relief water-proof and drainage system for the sea area tunnel according to claim 1, which is characterized in that: and an annular drainage blind pipe and an inverted arch longitudinal drainage blind pipe are arranged between every two annular construction joints outside the tunnel inverted arch range waterproof plate, and the annular drainage blind pipes and the inverted arch longitudinal drainage blind pipes are connected through a four-way pipe.

9. A construction method of a sea tunnel full-wrap waterproof threshold pressure-relief waterproof and drainage system is characterized by comprising the following steps:

firstly, grouting a stratum, excavating a tunnel cavern and carrying out primary support operation to form an anchor-shotcreting primary support layer;

secondly, after the leveling and facing of the primary support surface is carried out, geotextile is firstly applied, waterproof boards are applied to the tunnel arch wall and the inverted arch in a full-circle manner, and the waterproof boards of the arch wall and the inverted arch waterproof boards are hermetically welded at arch foot positions;

thirdly, applying double-sided self-adhesive waterproof coiled materials on the inner surface of the waterproof board to form a waterproof sealing area between adjacent construction joints;

fourthly, arranging an annular drainage plate and an arch foot longitudinal drainage blind pipe in the sealing area range of the waterproof plate of the arch wall, and introducing underground water into an inner side ditch of the tunnel through the arch foot longitudinal drainage blind pipe after the waterproof plate fails in sealing;

fifthly, arranging an annular drainage blind pipe and an inverted arch longitudinal drainage blind pipe between every two annular construction joints on the outer side of the tunnel inverted arch range waterproof plate, wherein the two annular drainage blind pipes are connected through a four-way pipe; the inverted arch longitudinal drainage blind pipe is communicated with the central drainage ditch through a vertical blind pipe, and the end of the vertical blind pipe is provided with a pressure release valve;

and sixthly, after the quality of the waterproof and drainage system is checked to be qualified, pouring construction of a self-compaction waterproof concrete structure and a secondary lining structure is carried out, and the inverted arch filling part is connected with the side ditch and the central drainage ditch by embedding the transverse drainage pipe.

10. The construction method of the sea area tunnel full-enclosed waterproof threshold pressure-relief water-proof and drainage system according to claim 9, characterized by comprising the following steps: in the fourth step, lay the vertical blind pipe drainage guide system of ring on the waterproof layer, the vertical blind pipe drainage guide system of ring is indulged including the unsmooth drain bar of hoop and the vertical drainage blind pipe of hunch foot, and the unsmooth drain bar of hoop is laid along the hunch wall interval, and the vertical drainage blind pipe of hunch foot lays between two side wall bottoms.

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