Submarine tunnel long-distance reverse slope drainage method

Abstract

The invention relates to the field of subsea tunnel construction, in particular to a subsea tunnel long-distance reverse slope drainage method which comprises the steps of drainage preparation, arrangement of a first pump station, arrangement of a second pump station, arrangement of a third pump station, arrangement of a fourth pump station, disassembly of the second pump station, arrangement of a dragon suction pump and disassembly of the dragon suction pump. By reasonably arranging the first pump station, the second pump station, the third pump station and the fourth pump station, accumulated water drainage in the subsea tunnel construction process is guaranteed, the situation that a large number of pump stations are installed in a subsea tunnel is avoided, and manpower and material resource consumption is reduced; the pumping force of a pump station in the subsea tunnel is fully utilized, and waste of the pumping force of the pump station is avoided; the arrangement mode of the subsea tunnel pump station is optimized, the subsea tunnel construction efficiency is improved, and the construction cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of submarine tunnel construction, in particular to a long-distance reverse slope drainage method for a submarine tunnel. BACKGROUND

[0002] Unlike land tunnels, a submarine tunnel needs to be excavated according to the seabed topography. Generally, the ports at both ends of the submarine tunnel are located on the ground, and the tunnel needs to penetrate into the seabed, resulting in a submarine tunnel with high ground at both ends and low ground in the middle, and the ground of the submarine tunnel section has ups and downs. During the construction of the submarine tunnel, the surrounding rock is immersed in water for a long time, and water leakage may occur during the construction process. To avoid the influence of a large amount of water on the construction of the submarine tunnel and to ensure the structural strength of the submarine tunnel, the surrounding rock is usually reinforced and water-stopped by advanced grouting, and then the grouting section is excavated. Even if the surrounding rock is reinforced and water-stopped by advanced grouting, seawater may still seep into the tunnel during the excavation of the submarine tunnel. During the entire excavation process of the submarine tunnel, the accumulated water in the submarine tunnel needs to be continuously drained. The submarine tunnel is composed of a parallel service tunnel and a main tunnel. The service tunnel is constructed before the main tunnel, and the service tunnel and the main tunnel are connected by several interval corridors.

[0003] However, even if the surrounding rock of the submarine tunnel is reinforced and grouted by advanced grouting, a large amount of water may still be discharged when the submarine tunnel is excavated to a water-rich section. In particular, when the submarine tunnel is constructed in a V-shaped non-water-rich section and the water-rich section is located at a higher position of the submarine tunnel, the conventional reverse slope drainage method needs to set more pump stations in the submarine tunnel to adapt to the drainage of the water-rich section of the submarine tunnel, which requires a large amount of manpower and material resources for pump station arrangement. After the grouting and water-stopping measures for the water-rich section of the submarine tunnel are completed, there is a waste of pumping power. SUMMARY

[0004] The present application aims to overcome the deficiencies in the prior art, such as the need for a large amount of manpower and material resources for pump station arrangement to adapt to the drainage of the water-rich section, and the waste of pumping power after the grouting and water-stopping measures for the water-rich section of the submarine tunnel are completed, and to provide a long-distance reverse slope drainage method for a submarine tunnel.

[0005] The application provides a long-distance reverse-slope drainage method for a submarine tunnel, the submarine tunnel comprising a main tunnel, a service tunnel and a plurality of corridors, the main tunnel comprising sequentially connected non-water-rich-section forward-slope main tunnels, non-water-rich-section reverse-slope main tunnels and water-rich-section reverse-slope main tunnels; the service tunnel comprising sequentially connected non-water-rich-section forward-slope service tunnels, non-water-rich-section reverse-slope service tunnels and water-rich-section reverse-slope service tunnels; the non-water-rich-section forward-slope main tunnel and the non-water-rich-section forward-slope service tunnel being connected through a corridor, the non-water-rich-section reverse-slope main tunnel and the non-water-rich-section reverse-slope service tunnel being connected through a corridor, and the water-rich-section reverse-slope main tunnel and the water-rich-section reverse-slope service tunnel being connected through a corridor, and comprising the following steps: S1, drainage preparation: a sedimentation tank is arranged outside the submarine tunnel; S2, first pump station arrangement: a first pump station is arranged in the non-water-rich-section forward-slope main tunnel, the first pump station being connected with the sedimentation tank; located in the non-water-rich-section forward-slope main tunnel region, the main tunnel face is provided with a first mobile water pumping station, the first mobile water pumping station being connected with the first pump station; located in the non-water-rich-section forward-slope service tunnel region, the service tunnel face is provided with a second mobile water pumping station, the second mobile water pumping station being connected with the first pump station; S3, second pump station arrangement: when the service tunnel is excavated to the non-water-rich-section reverse-slope service tunnel region, a second pump station is arranged in the submarine pump house, the second pump station being connected with the first pump station, and the second mobile water pumping station is removed; S4, third pump station arrangement: when the main tunnel is excavated to the non-water-rich-section reverse-slope main tunnel region, a third pump station is arranged at the junction of the non-water-rich-section forward-slope main tunnel and the non-water-rich-section reverse-slope main tunnel, the third pump station being connected with the first pump station, and the first mobile water pumping station is removed; S5, fourth pump station arrangement: when the service tunnel is excavated to the water-rich-section reverse-slope service tunnel region, a fourth pump station is arranged in the submarine pump house, the fourth pump station being connected with the third pump station; S6, second pump station removal: after the water-rich-section reverse-slope service tunnel region of the service tunnel is excavated, the second pump station is removed after grouting and water stopping construction is performed on the water-rich-section reverse-slope service tunnel region; S7, dragon suction pump arrangement: when the main tunnel is excavated to the water-rich-section reverse-slope main tunnel region, a dragon suction pump is arranged at the main tunnel face, the dragon suction pump being connected with the first pump station; S8, dragon suction pump removal: after the water-rich-section reverse-slope main tunnel region of the main tunnel is excavated, the dragon suction pump is removed after grouting and water stopping construction is performed on the water-rich-section reverse-slope main tunnel region.

[0006] Preferably, in S2, a fifth pump station is arranged in the non-water-rich-section forward-slope service tunnel region, one end of the fifth pump station being connected with the first pump station and the other end being connected with the second mobile water pumping station; In S4, the third pump station is connected with the fifth pump station; The fifth pump station is synchronously removed when the second pump station is removed.

[0007] Preferably, the drainage pipe of the fifth pump station is connected with the first pump station through the corridor.

[0008] Preferably, the fifth pump station is provided with an emergency pumping device, and the emergency pumping device is communicated with the first pump station.

[0009] Preferably, in the S2, the drainage pipe of the first pump station is communicated with the sedimentation tank through the inclined shaft.

[0010] Preferably, in the S2, a first water sump is arranged at the tunnel face of the main line tunnel, and the first mobile pumping station is communicated with the first water sump; a second water sump is arranged at the tunnel face of the service tunnel, and the second mobile pumping station is communicated with the second water sump.

[0011] Preferably, in the S3, the submarine pump house is located at the junction of the non-water-rich section of the service tunnel along the slope and the non-water-rich section of the service tunnel against the slope, the submarine pump house is provided with a third water sump, and the second pump station is communicated with the third water sump.

[0012] Preferably, in the S5, the fourth pump station is communicated with the third water sump.

[0013] Preferably, in the S1, the sedimentation tank comprises three-stage sedimentation tanks.

[0014] Preferably, the sum of the maximum drainage capacity of the second pump station and the maximum drainage capacity of the third pump station is less than the maximum drainage capacity of the first pump station.

[0015] Compared with the prior art, the present application has the following advantages: 1. The present application provides a long-distance anti-slope drainage method for a submarine tunnel, wherein a first pump station, a second pump station, a third pump station and a fourth pump station are arranged in the submarine tunnel, when the non-water-rich section of the main line tunnel along the slope and the non-water-rich section of the service tunnel along the slope are excavated, the water in the submarine tunnel is pumped out through the cooperation of the first pump station, the first mobile pumping station and the second mobile pumping station, and the water flows to the tunnel face along the slope, and the water at the tunnel face is pumped out, thereby effectively draining the water in the submarine tunnel.

[0016] 2.The method for long-distance reverse slope drainage of a submarine tunnel, when the submarine tunnel is excavated to a reverse slope area of a non-water-rich section, an intersection of a service tunnel of the non-water-rich section and a reverse slope service tunnel of the non-water-rich section is a submarine pump house, the submarine pump house is low in terrain, water in the service tunnel converges at the submarine pump house, a second pump station is arranged at the submarine pump house, and the water is pumped to a first pump station by the second pump station; a third pump station is arranged at an intersection of a main tunnel of the non-water-rich section and a reverse slope main tunnel of the non-water-rich section, water of the main tunnel converges at the third pump station, and the accumulated water is pumped to the first pump station by the third pump station; when the reverse slope service tunnel of the non-water-rich section is excavated, the water converges at the submarine pump house, and no additional pumping equipment needs to be arranged; when the reverse slope main tunnel of the non-water-rich section is excavated, the water converges at the third pump station, and no additional pumping equipment needs to be arranged; the accumulated water pumping route is optimized, and the construction progress of the submarine tunnel is ensured.

[0017] 3.The method for long-distance reverse slope drainage of a submarine tunnel, when the submarine tunnel is excavated to a reverse slope area of a water-rich section, the service tunnel of the submarine tunnel is excavated in advance, a large amount of water flows out of a reverse slope service tunnel area of the water-rich section, and the water in the service tunnel converges at the submarine pump house; a fourth pump station is arranged at the submarine pump house to drain water to the third pump station with a smaller drainage capacity, so that the pumping capacity of the third pump station is not wasted during the construction of the service tunnel; after grouting and water stopping of the reverse slope service tunnel area of the water-rich section are completed, the water discharge of the service tunnel is reduced, the second pump station is removed, and the accumulated water pumping capacity of the service tunnel is reduced; when the main tunnel is excavated to a reverse slope main tunnel area of the water-rich section, a dragon suction pump is arranged at a tunnel face of the main tunnel, the dragon suction pump is communicated with the first pump station, part of the water is pumped to the first pump station through the dragon suction pump, part of the accumulated water flows into the third pump station, and the accumulated water is pumped to the first pump station by the third pump station; after grouting and water stopping of the reverse slope main tunnel of the water-rich section are completed, the water discharge of the main tunnel is reduced, and the dragon suction pump is removed to reduce the pumping capacity of the main tunnel.

[0018] 4.The method for long-distance reverse slope drainage of a submarine tunnel, by reasonably arranging the first pump station, the second pump station, the third pump station and the fourth pump station, the accumulated water in the submarine tunnel during the construction of the submarine tunnel is ensured to be discharged, a large number of pumps installed in the submarine tunnel are avoided, and the consumption of manpower and material resources is reduced; the pumping capacity of the pump station in the submarine tunnel is fully utilized, the pumping capacity of the pump station is not wasted, the arrangement mode of the pump station in the submarine tunnel is optimized, the construction efficiency of the submarine tunnel is improved, the construction cost is saved, and the method has good economic value and practical value. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a structural schematic diagram of the submarine tunnel of the method for long-distance reverse slope drainage of a submarine tunnel; Figure 2 FIG. 2 is a structural schematic diagram of the service tunnel and the main tunnel of the method for long-distance reverse slope drainage of a submarine tunnel; Figure 3Flowchart of the long-distance reverse-slope drainage method for the submarine tunnel of the present application; Figure 4 Drainage structure schematic diagram of the first pump station of the long-distance reverse-slope drainage method for the submarine tunnel of the present application; Figure 5 Drainage structure schematic diagram of the second pump station of the long-distance reverse-slope drainage method for the submarine tunnel of the present application; Figure 6 Drainage structure schematic diagram of the fourth pump station of the long-distance reverse-slope drainage method for the submarine tunnel of the present application; Figure 7 Drainage structure schematic diagram of the long-distance reverse-slope drainage method for the submarine tunnel of the present application; Figure 8 Drainage structure schematic diagram of the long-distance reverse-slope drainage method for the submarine tunnel of the present application;

[0020] Markings in the figure: 1-first pump station, 2-second pump station, 3-third pump station, 4-fourth pump station, 5-fifth pump station, 6-first mobile water pumping station, 61-first water accumulation pit, 7-second mobile water pumping station, 71-second water accumulation pit, 8-third water accumulation pit, 9-settling tank, 10-dragon suction pump, 100-service tunnel, 101-main line tunnel, 102-corridor, 103-water-rich section, 104-submarine pump house, 201-non-water-rich section down-slope main line tunnel, 202-non-water-rich section reverse-slope main line tunnel, 203-water-rich section reverse-slope main line tunnel, 204-non-water-rich section down-slope service tunnel, 205-non-water-rich section reverse-slope service tunnel, 206-water-rich section reverse-slope service tunnel. DETAILED DESCRIPTION

[0021] The present application will be further described in conjunction with specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter of the present application is limited to the following embodiments, and any technology implemented based on the content of the present application falls within the scope of the present application.

[0022] In the description of the specific embodiments of the present application, the terms indicating the orientation or positional relationship of "up", "down", "left", "right", "center", "inner", "outer", etc. are expressed based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product / equipment / device of the present application is normally used. These terms of orientation or positional relationship are only used to facilitate the description of the present application scheme or simplify the description in the specific embodiments, to facilitate the quick understanding of the scheme by the technicians, and are not intended to indicate or imply that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship, and therefore cannot be understood as a limitation on the present application.

[0023] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel", "coaxial" and the like appear, it does not mean that the corresponding device / component / element must be absolutely horizontal or vertical or overhanging or parallel or coaxial, but can be slightly inclined or have a deviation, as long as it does not affect the normal function of the related component. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined; "coaxial" means that two components are coaxially arranged as much as possible, and can move in a coaxial or approximately coaxial manner when the relative position changes. Alternatively, it can be simplified to understand that the corresponding device / component / element is arranged in the "horizontal", "vertical", "overhanging", "parallel", "coaxial" and the like, and can have an error / deviation of ±10% relative to the corresponding direction, more preferably an error / deviation of ±8% or less, more preferably an error / deviation of ±6% or less, more preferably an error / deviation of ±5% or less, and more preferably an error / deviation of ±4% or less. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the present application.

[0024] In addition, the terms "first", "second", "third" and the like in the terms are only used to distinguish the same or similar components for description, and should not be understood as emphasizing or implying the relative importance of the specific components.

[0025] In addition, in the description of the embodiments of the present application, "several", "a plurality of", "several" represent at least 2. It can be 2, 3, 4, 5, 6, 7, 8, 9, etc. in any case, and can even be more than 9.

[0026] In addition, in the description of the technical solutions of the present application, unless otherwise specified / limited / limited, the terms "arrangement", "installation", "connection", "connection", "provided with", "laid", "arrangement" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, which can be welding, riveting, bolting, screwing and other commonly used connection means in the art. The connection can be mechanical connection, electrical connection or communication connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the communication between two elements.

[0027] Example 1 As Figures 1-8As shown, the long-distance reverse-slope drainage method of the submarine tunnel, the submarine tunnel comprises a main tunnel 101, a service tunnel 100 and a plurality of corridors 102, the main tunnel 101 comprises a non-water-rich section forward-slope main tunnel 201, a non-water-rich section reverse-slope main tunnel 202 and a water-rich section reverse-slope main tunnel 203 which are sequentially connected, the service tunnel 100 comprises a non-water-rich section forward-slope service tunnel 204, a non-water-rich section reverse-slope service tunnel 205 and a water-rich section reverse-slope service tunnel 206 which are sequentially connected, the non-water-rich section forward-slope main tunnel 201 and the non-water-rich section forward-slope service tunnel 204 are connected through the corridor 102, the non-water-rich section reverse-slope main tunnel 202 and the non-water-rich section reverse-slope service tunnel 205 are connected through the corridor 102, and the water-rich section reverse-slope main tunnel 203 and the water-rich section reverse-slope service tunnel 206 are connected through the corridor 102, and specifically comprises the following steps: S1, drainage preparation: a sedimentation tank 9 is arranged outside the submarine tunnel; The submarine tunnel has a large amount of water, and the discharged accumulated water mainly contains silt, which can be precipitated through the sedimentation tank 9, so that the accumulated water can be discharged up to the standard; the sedimentation tank 9 is a three-stage sedimentation tank; S2, setting a first pump station 1: a first pump station 1 is arranged in the non-water-rich section forward-slope main tunnel 201, and the first pump station 1 is connected with the sedimentation tank 9; located in the non-water-rich section forward-slope main tunnel 201 region, the main tunnel 101 has a first mobile water pumping station 6 arranged at the tunnel face, and the first mobile water pumping station 6 is connected with the first pump station 1; located in the non-water-rich section forward-slope service tunnel 204 region, the service tunnel 100 has a second mobile water pumping station 7 arranged at the tunnel face, and the second mobile water pumping station 7 is connected with the first pump station 1; The first mobile water pumping station 6 can be adjusted in position with the tunnel face of the main tunnel 101 advancing, so as to avoid the influence of a large amount of accumulated water at the tunnel face of the main tunnel 101 on construction; the second mobile water pumping station 7 can be moved in position with the tunnel face of the service tunnel 100 advancing, so as to avoid the influence of a large amount of accumulated water at the tunnel face of the service tunnel 100 on construction; S3, setting a second pump station 2: when the service tunnel 100 is excavated to the non-water-rich section reverse-slope service tunnel 205 region, a second pump station 2 is arranged in the submarine pump house 104, the second pump station 2 is connected with the first pump station 1, and the second mobile water pumping station 7 is removed; The submarine pump house 104 is located at the lowest position of the submarine tunnel, and the accumulated water in the service tunnel 100 converges to the submarine pump house 104 under the action of gravity, so that the accumulated water in the service tunnel 100 can be discharged through the second pump station 2; S4, setting a third pump station 3: when the main tunnel 101 is excavated to the non-water-rich section reverse-slope main tunnel 202 region, a third pump station 3 is arranged at the junction of the non-water-rich section forward-slope main tunnel 201 and the non-water-rich section reverse-slope main tunnel 202, the third pump station 3 is connected with the first pump station 1, and the first mobile water pumping station 6 is removed; The third pump station 3 is located at the lowest position of the main line tunnel 101, and the accumulated water in the main line tunnel 101 converges to the third pump station 3, so as to facilitate the discharge of the accumulated water in the main line tunnel 101; S5, setting the fourth pump station 4: when the service tunnel 100 is excavated to the water-rich section reverse slope service tunnel 206 region, the fourth pump station 4 is arranged in the submarine pump house 104, and the fourth pump station 4 is communicated with the third pump station 3; The water-rich section reverse slope service tunnel 206 is constructed earlier than the water-rich section reverse slope main line tunnel 203, the water discharge pressure of the main line tunnel 101 is small when the water-rich section reverse slope service tunnel 206 is constructed, the water discharge of the water-rich section reverse slope service tunnel 206 is large, and the fourth pump station 4 is used to assist the water discharge of the service tunnel 100; S6, removing the second pump station 2: after the water-rich section reverse slope service tunnel 206 region of the service tunnel 100 is excavated and completed, the grouting water stopping construction is implemented on the water-rich section reverse slope service tunnel 206 region, and then the second pump station 2 is removed; After the grouting water stopping construction is implemented on the water-rich section reverse slope service tunnel 206 region, the water discharge of the service tunnel 100 is small, the removal of the second pump station 2 reduces the water discharge of the service tunnel 100, and after the second pump station 2 is removed, the fourth pump station 4 is moved to the submarine pump house 104 to perform the water discharge operation; S7, setting the dragon suction pump 10: when the main line tunnel 101 is excavated to the water-rich section reverse slope main line tunnel 203 region, the dragon suction pump 10 is arranged at the tunnel face of the main line tunnel 101, and the dragon suction pump 10 is communicated with the first pump station 1; When the water-rich section reverse slope main line tunnel 203 is constructed, the water discharge of the main line tunnel 101 is large, the water discharge at the tunnel face of the main line tunnel 101 is extracted through the dragon suction pump 10, the water discharge pressure of the third pump station 3 is reduced, and the normal construction of the main line tunnel 101 is ensured; S8, removing the dragon suction pump 10: after the water-rich section reverse slope main line tunnel 203 region of the main line tunnel 101 is excavated and completed, the grouting water stopping construction is implemented on the water-rich section reverse slope main line tunnel 203 region, and then the dragon suction pump 10 is removed; After the grouting water stopping construction is implemented on the water-rich section reverse slope main line tunnel 203 region, the water discharge of the main line tunnel 101 is reduced, and the removal of the dragon suction pump 10 reduces the water discharge of the main line tunnel 101.

[0028] The first pump station 1, the second pump station 2, the third pump station 3 and the fourth pump station 4 are arranged in the submarine tunnel. When the non-rich water section slope main tunnel 201 and the non-rich water section slope service tunnel 204 are excavated, the water in the submarine tunnel is pumped out through the cooperation of the first pump station 1, the first mobile pumping station 6 and the second mobile pumping station 7, and the water flows to the tunnel face. The water in the tunnel face is pumped out, so that the water in the submarine tunnel can be well pumped out. When the submarine tunnel is excavated to the reverse slope area of the non-rich water section, the intersection of the non-rich water section slope service tunnel 204 and the non-rich water section reverse slope service tunnel 205 is the submarine pump house. The water in the service tunnel 100 flows to the submarine pump house. The second pump station 2 is arranged in the submarine pump house. The water is pumped to the first pump station 1 by the second pump station 2. The third pump station 3 is arranged at the intersection of the non-rich water section slope main tunnel 201 and the non-rich water section reverse slope main tunnel 202. The water in the main tunnel 101 flows to the third pump station 3. The water is pumped to the first pump station 1 by the third pump station 3. When the non-rich water section reverse slope service tunnel 205 is excavated, the water flows to the submarine pump house. No additional pumping equipment is needed. When the non-rich water section reverse slope main tunnel 202 is excavated, the water flows to the third pump station 3. No additional pumping equipment is needed. The water pumping route is optimized, and the construction progress of the submarine tunnel is ensured. When the submarine tunnel is excavated to the reverse slope area of the rich water section 103, the service tunnel 100 is excavated first. A large amount of water flows out of the rich water section reverse slope service tunnel 206 area. The water in the service tunnel 100 flows to the submarine pump house. The fourth pump station 4 is arranged in the submarine pump house to drain the third pump station 3 with small drainage capacity. The pumping capacity of the third pump station 3 is not wasted when the service tunnel 100 is constructed. After the grouting and water stopping of the rich water section reverse slope service tunnel 206 area are completed, the water discharge of the service tunnel 100 is reduced. The second pump station 2 is removed to reduce the water pumping capacity of the service tunnel 100. When the main tunnel 101 is excavated to the rich water section reverse slope main tunnel 203 area, the suction pump 10 is arranged at the tunnel face of the main tunnel 101. The suction pump 10 is communicated with the first pump station 1. Part of the water is pumped to the first pump station 1 by the suction pump 10. Part of the water flows to the third pump station 3. The water is pumped to the first pump station 1 by the third pump station 3. After the grouting and water stopping of the rich water section reverse slope main tunnel 203 are completed, the water discharge of the main tunnel 101 is reduced. The suction pump 10 is removed to reduce the pumping capacity of the main tunnel 101.

[0029] Specifically, the submarine tunnel is constructed in the following construction sequence: the first pump station 1 is arranged, the non-rich water section slope service tunnel 204 is constructed, the second pump station 2 is arranged, the non-rich water section slope main tunnel 201 is constructed, the third pump station 3 is arranged, the non-rich water section reverse slope service tunnel 205 is constructed, the non-rich water section reverse slope main tunnel 202 is constructed, the fourth pump station 4 is installed, the rich water section reverse slope service tunnel 206 is constructed, the second pump station 2 is removed, the suction pump 10 is arranged, the grouting and water stopping of the rich water section reverse slope service tunnel 206 are constructed, and the suction pump 10 is removed.

[0030] Specifically, the non-water-rich section downhill main tunnel 201 is a tunnel formed by the downhill construction of the main tunnel in the non-water-rich section, the non-water-rich section uphill main tunnel 202 is a tunnel formed by the uphill construction of the main tunnel in the water-rich section, and the water-rich section uphill main tunnel 203 is a tunnel formed by the uphill construction of the main tunnel in the water-rich section.

[0031] Specifically, the non-water-rich section downhill service tunnel 204 is a tunnel formed by the downhill construction of the service tunnel in the non-water-rich section, the non-water-rich section uphill service tunnel 205 is a tunnel formed by the uphill construction of the service tunnel in the non-water-rich section, and the water-rich section uphill service tunnel 206 is a tunnel formed by the uphill construction of the service tunnel in the water-rich section.

[0032] Specifically, the downhill construction is the downward inclined construction of the submarine tunnel, and the uphill construction is the upward inclined construction of the tunnel.

[0033] In one or more embodiments, in S2, a fifth pump station 5 is arranged in the non-water-rich section downhill service tunnel 204 region, one end of the fifth pump station 5 is communicated with the first pump station 1, and the other end is communicated with the second mobile water pumping station 7; In S4, the third pump station 3 is communicated with the fifth pump station 5; In S6, the fifth pump station 5 is removed synchronously when the second pump station 2 is removed.

[0034] The fifth pump station 5 is used to transport the accumulated water pumped by the second mobile water pumping station 7 or the second pump station 2 to the first pump station 1, so as to reduce the water pumping pressure of the second mobile water pumping station 7 or the second pump station 2.

[0035] In an optional embodiment, the drainage pipe of the fifth pump station 5 is connected with the first pump station 1 through the corridor 102, and the drainage pipe of the fifth pump station 5 is arranged along the path with the shortest distance.

[0036] In an optional embodiment, the fifth pump station 5 is provided with an emergency pumping and draining pump, which is communicated with the first pump station 1. In order to avoid that the water output of the service tunnel 100 exceeds the drainage capacity of the fifth pump station 5, the emergency pumping and draining pump is arranged to increase the drainage capacity.

[0037] In one or more embodiments, in S2, the drainage pipe of the first pump station 1 is communicated with the sedimentation tank 9 through the inclined shaft, and the sedimentation tank 9 is located at the mouth of the inclined shaft.

[0038] In one or more embodiments, in S2, a first accumulated water pit 61 is arranged at the working face of the main tunnel 101, and the first mobile water pumping station 6 is communicated with the first accumulated water pit 61; a second accumulated water pit 71 is arranged at the working face of the service tunnel 100, and the second mobile water pumping station 7 is communicated with the second accumulated water pit 71; the first accumulated water pit 61 and the second accumulated water pit 71 are used to collect the water output respectively, so as to facilitate the pumping and draining of the accumulated water.

[0039] In one or more embodiments, in S3, the subsea pump house 104 is located at the junction of the non-water-rich section of the uphill service tunnel 204 and the non-water-rich section of the downhill service tunnel 205, the subsea pump house 104 is provided with a third sump 8, and the second pump station 2 is in communication with the third sump 8; the junction of the non-water-rich section of the uphill service tunnel 204 and the non-water-rich section of the downhill service tunnel 205 is the lowest point of the service tunnel 100, water collects in the subsea pump house 104, and the third sump 8 collects the accumulated water, which facilitates the pumping and drainage by the second pump station 2.

[0040] In an optional embodiment, in S5, the fourth pump station 4 is in communication with the third sump 8, and when the water discharge of the service tunnel 100 increases, the fourth pump station 4 is used to enhance the drainage capacity of the service tunnel 100.

[0041] In one or more embodiments, the sum of the maximum drainage capacity of the second pump station 2 and the maximum drainage capacity of the third pump station 3 is less than the maximum drainage capacity of the first pump station 1; this enables the first pump station 1 to cope with a sudden large amount of water in the subsea tunnel; and this ensures the safety of tunnel construction.

[0042] In a specific embodiment, the longitudinal slope of the in-line route of a certain subsea tunnel is a "V-shaped slope", the height difference between the shaft mouth and the lowest point of the route is about 128m, of which the height difference between the shaft mouth and the first pump station 1 is about 88m, the height difference between the first pump station 1 and the lowest point of the route in the direction of the main line tunnel 101 is about 40m, and the height difference between the first pump station 1 and the lowest point of the route in the direction of the service passage is about 40m.

[0043] The small mileage direction of the service tunnel 100 is uphill construction, the second mobile water pumping station 7 is arranged at about 50~100m behind the working face in the direction of large mileage, the second sump 71 is temporarily arranged at the working face, and the second mobile water pumping station 7 pumps the accumulated water in the second sump 71; a temporary pump station is arranged in the service tunnel 100. The drainage of the service tunnel 100 is organized in the order of the second sump 71→the second mobile water pumping station 7→the temporary pump station→the first pump station 1→the sedimentation tank 9.

[0044] The small mileage direction of the main line tunnel 101 is uphill construction, the water flows to the first pump station 1 through the side ditch and is pumped out of the tunnel; the first mobile water pumping station 6 is arranged at about 50~100m behind the working face in the direction of large mileage, the first sump 61 is temporarily arranged at the working face, and the first mobile water pumping station 6 pumps the accumulated water in the first sump 61. The drainage of the main line tunnel 101 is organized in the order of the first sump 61→the first mobile water pumping station 6→the first pump station 1→the sedimentation tank 9.

[0045] After the service tunnel 100 and the upper structure of the submarine pump house 104 are excavated, a third water sump 8 is arranged at the lowest point of the submarine pump house 104, the service tunnel 100 and the small mileage seepage water flow into the third water sump 8 by gravity, and the third water sump 8 drains the water flowing by itself in the whole tunnel during construction; the water in the service tunnel 100 is drained in the order of water sump→second pump station 2→temporary pump station→first pump station 1→sedimentation tank 9.

[0046] The first pump station mainly collects the water in the whole tunnel, and the maximum water head difference is 80 m. One DN200 mm drainage pipe and two DN250 mm drainage pipes are arranged from the first pump station to the inclined shaft portal. The first pump station 1 is connected with the DN200 mm drainage pipe by a water pump with the type of DFSS150-4 / 2, and the first pump station 1 is connected with the DN250 mm drainage pipe by a water pump with the type of DFSS200-4N / 2, B type. The maximum drainage capacity is (150+236+236)=622 m³ / h=14928 m³ / d.

[0047] The temporary pump station collects the water in the inclined shaft and the service tunnel 100 in the first stage of construction, and drains the water to the first pump station 1 by the fifth pump station 5. The water head difference is 10 m. One DN200 pipe and one DN80 pipe are arranged from the fifth pump station 5 to the first pump station 1. The fifth pump station 5 is connected with a water pump with the type of 100WQ80-45-22 and 80WQ50-50-15. The maximum drainage capacity is 80*2+50=210 m³ / h=5040 m³ / d.

[0048] The second pump station 2 collects the water in the inclined shaft and the service tunnel 100. The drainage path is third water sump 8→second pump station 2→temporary pump station. The water head difference is about 30 m. Two DN160 mm drainage pipes are arranged. The second pump station 2 is connected with a water pump with the type of 100WQ80-45-22. The maximum drainage capacity is 80*4=320 m³ / h=7680 m³ / d.

[0049] The fifth pump station 5 collects the water in the inclined shaft and the service tunnel 100. The fifth pump station 5→first pump station 1, and the water head difference is about 40 m. One DN200 pipe and two DN160 mm drainage pipes are arranged from the fifth pump station 5 to the first pump station 1. The water pump type is DFW125-315 / 2 / 90, DFSS150-6N / 2 and DFSS200-7 / 2C type. The third pump station 3 has a daily maximum drainage capacity of 160+145+240=545 m³ / h=13080 m³ / d, which is greater than 3200 m³ / d. When the emergency drainage is performed, two standby water pumps are started, and the drainage capacity can be increased by 30%, that is, the maximum drainage capacity is 545*1.3=708.5 m³ / h=17004 m³ / d>12240 m³ / d=(3200+7000)*1.2. The standby water pump type is 100WQ80-45-22.

[0050] When the main tunnel 101 is excavated to the non-rich water section and the anti-slope main tunnel 202 region, the small mileage direction flow water is self-flowed to the first pump station 1 through the side ditch and is pumped out of the hole; the large mileage direction and the flow water of the working face are all self-flowed to the third pump station 3. The third pump station 3→the first pump station 1→the sedimentation tank 9 are sequentially arranged to organize the main tunnel 101 to pump and drain water.

[0051] When the service tunnel 100 is excavated to the non-rich water section and the anti-slope service tunnel 205 region, the second pump station 2 is arranged in the service tunnel 100 submarine pump house 104 to collect the water quantity of the inclined shaft and the service tunnel 100; the second pump station 2→the first pump station 1→the sedimentation tank 9 are sequentially arranged to organize the service tunnel 100 to pump and drain water.

[0052] When the service tunnel 100 is excavated to the rich water section and the anti-slope service tunnel 206 region, the fourth pump station 4→the third pump station 3→the first pump station 1→the sedimentation tank 9, the second pump station 2→the fifth pump station 5→the first pump station 1→the sedimentation tank 9 are sequentially arranged to organize the service tunnel 100 to pump and drain water.

[0053] When the main tunnel 101 is excavated to the rich water section and the anti-slope main tunnel 203 region, the suction pump 10 is arranged, the third pump station 3→the first pump station 1→the sedimentation tank 9, the suction pump 10→the first pump station 1→the sedimentation tank 9 are sequentially arranged to organize the main tunnel 101 to pump and drain water.

[0054] The above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for long distance counter-slope drainage of a subsea tunnel, characterized in that, The subsea tunnel comprises a main tunnel (101), a service tunnel (100) and a plurality of corridors (102), the main tunnel (101) comprises a non-water-rich section downhill main tunnel (201), a non-water-rich section uphill main tunnel (202) and a water-rich section uphill main tunnel (203) which are sequentially communicated, the service tunnel (100) comprises a non-water-rich section downhill service tunnel (204), a non-water-rich section uphill service tunnel (205) and a water-rich section uphill service tunnel (206) which are sequentially communicated, the non-water-rich section downhill main tunnel (201) and the non-water-rich section downhill service tunnel (204) are communicated through the corridor (102), the non-water-rich section uphill main tunnel (202) and the non-water-rich section uphill service tunnel (205) are communicated through the corridor (102), and the water-rich section uphill main tunnel (203) and the water-rich section uphill service tunnel (206) are communicated through the corridor (102), and the method comprises the following steps: S1, drainage preparation: a sedimentation tank (9) is arranged outside the subsea tunnel; S2, setting a first pump station (1): a first pump station (1) is arranged in the non-water-rich section downhill main tunnel (201), the first pump station (1) is communicated with the sedimentation tank (9); the first mobile water pumping station (6) is arranged on the tunnel face of the main tunnel (101) in the non-water-rich section downhill main tunnel (201) region, the second mobile water pumping station (7) is arranged on the tunnel face of the service tunnel (100) in the non-water-rich section downhill service tunnel (204) region, and the second mobile water pumping station (7) is communicated with the first pump station (1); S3, setting a second pump station (2): when the service tunnel (100) is excavated to the non-water-rich section uphill service tunnel (205) region, a second pump station (2) is arranged in the subsea pump house (104), the second pump station (2) is communicated with the first pump station (1), and the second mobile water pumping station (7) is removed; S4, setting a third pump station (3): when the main tunnel (101) is excavated to the non-water-rich section uphill main tunnel (202) region, a third pump station (3) is arranged at the junction of the non-water-rich section downhill main tunnel (201) and the non-water-rich section uphill main tunnel (202), the third pump station (3) is communicated with the first pump station (1), and the first mobile water pumping station (6) is removed; S5, setting a fourth pump station (4): when the service tunnel (100) is excavated to the water-rich section uphill service tunnel (206) region, a fourth pump station (4) is arranged in the subsea pump house (104), and the fourth pump station (4) is communicated with the third pump station (3); S6, removing the second pump station (2): after the water-rich section uphill service tunnel (206) region of the service tunnel (100) is excavated, the second pump station (2) is removed after the grouting and water stopping construction of the water-rich section uphill service tunnel (206) region is implemented; S7, setting a dragon suction pump (10): when the main tunnel (101) is excavated to the water-rich section uphill main tunnel (203) region, a dragon suction pump (10) is arranged at the tunnel face of the main tunnel (101), and the dragon suction pump (10) is communicated with the first pump station (1). S8, remove the dragon suction pump (10): the rich water section of the main line tunnel (101) after the completion of the reverse slope main line tunnel (203) region excavation, the rich water section of the reverse slope main line tunnel (203) region is implemented after grouting water stop construction, remove the dragon suction pump (10).

2. The long distance counter-slope drainage method for a subsea tunnel according to claim 1, characterized by, In S2, the fifth pump station (5) is arranged in the non-rich water section of the slope service tunnel (204) region, one end of the fifth pump station (5) is communicated with the first pump station (1), and the other end is communicated with the second mobile pumping station (7); In S4, the third pump station (3) is communicated with the fifth pump station (5); In S6, the fifth pump station (5) is removed synchronously when the second pump station (2) is removed.

3. The long distance counter-slope drainage method for a subsea tunnel according to claim 2, characterized in that, The drainage pipe of the fifth pump station (5) is connected with the first pump station (1) through the corridor (102).

4. The long distance counter-slope drainage method for a subsea tunnel according to claim 2, characterized by, The fifth pump station (5) is provided with an emergency pumping pump, and the emergency pumping pump is communicated with the first pump station (1).

5. The long distance counter-slope drainage method for subsea tunnels according to claim 1, characterized in that, In S2, the drainage pipe of the first pump station (1) is communicated with the sedimentation tank (9) through the inclined shaft.

6. The long distance counter-slope drainage method for subsea tunnels according to claim 1, characterized in that, In S2, the first pump station (1) is communicated with the first water accumulation pit (61) at the working face of the main line tunnel (101); the second mobile pumping station (7) is communicated with the second water accumulation pit (71) at the working face of the service tunnel (100).

7. The long distance counter-slope drainage method for subsea tunnels according to claim 1, characterized in that, In S3, the submarine pump house (104) is located at the junction of the non-rich water section of the slope service tunnel (204) and the non-rich water section of the reverse slope service tunnel (205), and the submarine pump house (104) is provided with a third water accumulation pit (8), and the second pump station (2) is communicated with the third water accumulation pit (8).

8. The long distance counter-slope drainage method for subsea tunnels according to claim 6, characterized in that, In S5, the fourth pump station (4) is communicated with the third water accumulation pit (8).

9. The long distance counter-slope drainage method for subsea tunnels according to claim 1, characterized in that, In S1, the sedimentation tank (9) comprises three-stage sedimentation tanks.

10. The method according to any one of claims 1-9, wherein, The sum of the maximum drainage capacity of the second pump station (2) and the maximum drainage capacity of the third pump station (3) is less than the maximum drainage capacity of the first pump station (1).

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