Reverse slope drainage system for long-distance water conveying tunnel TBM construction and working method of reverse slope drainage system

Abstract

The invention discloses a reverse slope drainage system for long-distance water conveying tunnel TBM construction and a working method of the reverse slope drainage system. The reverse slope drainage system comprises a TBM area inner drainage system, a main tunnel on-way drainage system, a main and branch tunnel crossed section drainage system and a branch tunnel section drainage system. The TBM area internal drainage system comprises a first pump station arranged below a TBM main beam and a second pump station arranged on a TBM rear matching trolley, the main tunnel on-way drainage system comprises a third pump station, a fourth pump station and a fifth pump station, and the main tunnel and branch tunnel crossing section drainage system comprises a sixth pump station and a transfer water storage pool. The adit section drainage system comprises a seventh pump station, an eighth pump station, a first adit transfer reservoir and a second adit transfer reservoir. By combining the eight pump stations, the comprehensive drainage capacity of the TBM in the down-slope tunneling and down-slope drainage construction process is improved, the upstream position of main hole construction is fully utilized, a large transfer reservoir is arranged at the intersection section of the main hole and the branch hole, and the TBM tunnel construction progress is not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of TBM construction of water conveyance tunnels, and in particular relates to a reverse slope drainage system and a working method thereof for TBM construction of a long-distance water conveyance tunnel. Background Art

[0002] When using an open TBM (full-face tunnel boring machine) to excavate a long-distance water transfer tunnel, the open TBM equipment has the characteristics of being unable to evacuate the working face, high equipment value, many people in the working area, and high voltage level of electricity used in the tunnel. Once a sudden water surge occurs at the face, the initial hydrogeological conditions of the tunnel site will be changed, and the tunnel will become a drainage channel for the disaster water body, reducing the stability of the tunnel surrounding rock. If timely and effective drainage measures are not taken, the construction period will be delayed at best, and the tunnel will be induced to collapse on a large scale, causing the machine to be destroyed and people to die. Therefore, the effective solution to the drainage problem will be directly related to the safety and efficiency of the tunnel construction. At present, when an open TBM uses reverse slope drainage in a long-distance water transfer tunnel, it faces difficulties such as narrow space in the tunnel, long drainage distance, large drainage height difference, and long operation cycle of the drainage system. The reverse slope drainage system often has defects such as waste of resources under conventional drainage conditions and insufficient drainage capacity under disaster conditions. Therefore, a reverse slope drainage system and a working method for TBM construction of a long-distance water transfer tunnel should be provided. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a reverse slope drainage system and a working method for TBM construction of a long-distance water transfer tunnel in view of the deficiencies in the above-mentioned prior art. The system is reasonably designed by arranging a first pumping station under the TBM main beam, a second pumping station on the rear supporting trolley of the TBM, a third pumping station, a fourth pumping station and a fifth pumping station in the main tunnel, a sixth pumping station at the intersection of the main and branch tunnels, and a seventh pumping station and an eighth pumping station in the branch tunnels. By combining the eight pumping stations, the comprehensive drainage capacity of the TBM in the process of downslope excavation and reverse slope drainage construction is improved, the upstream position of the main tunnel construction is fully utilized, and a large transfer water reservoir is set at the intersection of the main and branch tunnels. The large transfer water reservoir serves as a relay station of the reverse slope drainage system, which helps to improve the drainage capacity of the reverse slope drainage system without affecting the construction progress of the TBM tunnel construction.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a reverse slope drainage system for TBM construction of a long-distance water transfer tunnel, characterized in that it includes a drainage system in the TBM area, a drainage system along the main tunnel, a drainage system for the intersection section of the main and branch tunnels, and a drainage system for the branch tunnel section; the drainage system in the TBM area includes a first pump station arranged under the TBM main beam and a second pump station arranged on the TBM rear supporting trolley, the first pump station includes a plurality of sand pumps for pumping water into a normal drainage sewage tank or an emergency drainage sewage tank of the TBM rear supporting trolley, the second pump station includes a plurality of first mining wear-resistant multistage centrifugal pumps arranged outside the normal drainage sewage tank and a plurality of second mining wear-resistant multistage centrifugal pumps arranged outside the emergency drainage sewage tank; the main tunnel along the drainage system includes a first pump station arranged under the TBM main beam and a second pump station arranged on the TBM rear supporting trolley, the first pump station includes a plurality of sand pumps for pumping water into a normal drainage sewage tank or an emergency drainage sewage tank of the TBM rear supporting trolley, the second pump station includes a plurality of first mining wear-resistant multistage centrifugal pumps arranged outside the normal drainage sewage tank and a plurality of second mining wear-resistant multistage centrifugal pumps arranged outside the emergency drainage sewage tank; the main tunnel along the drainage system includes It includes the third pumping station, the fourth pumping station and the fifth pumping station arranged in the main tunnel, the third pumping station includes the third mining wear-resistant multistage centrifugal pump, the fourth pumping station includes the fourth mining wear-resistant multistage centrifugal pump, and the fifth pumping station includes the fifth mining wear-resistant multistage centrifugal pump; the main branch tunnel intersection section drainage system includes the sixth pumping station and a large transfer water reservoir arranged in the main branch tunnel intersection section, and the large transfer water reservoir is provided with multiple sixth mining wear-resistant multistage centrifugal pumps on the side near the main branch tunnel intersection; the branch tunnel section drainage system includes the seventh pumping station, the eighth pumping station, the first branch tunnel transfer water reservoir and the second branch tunnel transfer water reservoir arranged in the branch tunnel, the first branch tunnel transfer water reservoir is provided with the seventh mining wear-resistant multistage centrifugal pump on one side, and the second branch tunnel transfer water reservoir is provided with the eighth mining wear-resistant multistage centrifugal pump on one side.

[0005] The above-mentioned reverse slope drainage system for TBM construction of long-distance water transfer tunnel is characterized in that: the large-scale transfer water storage tank includes a concrete bottom plate and a concrete gravity retaining wall surrounded by the concrete bottom plate, and a slag pile is arranged on the outer side of the concrete gravity retaining wall close to the upstream side of the main tunnel to prevent the impact of blasting from the upstream tunnel. The large-scale transfer water storage tank is equipped with a sewage tank and a slag pit.

[0006] The above-mentioned reverse slope drainage system for TBM construction of a long-distance water transfer tunnel is characterized in that a refuge tunnel is arranged in the branch tunnel, and an external sewage pool is arranged outside the branch tunnel.

[0007] The above-mentioned reverse slope drainage system for TBM construction of long-distance water transfer tunnel is characterized in that a temporary slag storage hole is provided at the intersection section of the main and branch tunnels.

[0008] The above-mentioned reverse slope drainage system for TBM construction of long-distance water diversion tunnel is characterized in that: the number of the sand discharge pumps is 7, the number of the first mine-use wear-resistant multistage centrifugal pumps is 2, the number of the second mine-use wear-resistant multistage centrifugal pumps is 2, the number of the third mine-use wear-resistant multistage centrifugal pumps is 2, the number of the fourth mine-use wear-resistant multistage centrifugal pumps and the number of the fifth mine-use wear-resistant multistage centrifugal pumps are both 1, the number of the sixth mine-use wear-resistant multistage centrifugal pumps is 5, and the number of the seventh mine-use wear-resistant multistage centrifugal pumps and the number of the eighth mine-use wear-resistant multistage centrifugal pumps are both 2.

[0009] The present invention also provides a working method of a reverse slope drainage system for TBM construction of a long-distance water transfer tunnel, characterized in that the working method comprises:

[0010] When the water seepage at the face is between 0m 3 / h~320m 3 / h, start the normal drainage system to pump out water: according to the amount of water seepage at the face, determine the number of sand pumps and the first mining wear-resistant multi-stage centrifugal pumps to be started, and use one or more sand pumps to pump the water to the normal drainage tank on the supporting trolley behind the TBM; then use the first mining wear-resistant multi-stage centrifugal pump to pump the water in the normal drainage tank to the rear area of ​​the TBM;

[0011] According to the amount of seepage water in the pumping and drainage sections of each pumping station, determine the intermittent or continuous start of the third mining wear-resistant multistage centrifugal pump, the fourth mining wear-resistant multistage centrifugal pump, the fifth mining wear-resistant multistage centrifugal pump, the sixth mining wear-resistant multistage centrifugal pump, the seventh mining wear-resistant multistage centrifugal pump or the eighth mining wear-resistant multistage centrifugal pump;

[0012] When the water seepage at the face is between 320m 3 / h~1300m 3 / h, start the emergency drainage system to pump out water:

[0013] According to the amount of water seepage at the face, determine the number of sand pumps, the first mining wear-resistant multistage centrifugal pump, and the second mining wear-resistant multistage centrifugal pumps to be started, and use one or more sand pumps to pump the drainage to the normal drainage sewage tank and the emergency drainage sewage tank of the supporting trolley behind the TBM; then use the first mining wear-resistant multistage centrifugal pump to pump the drainage in the normal drainage sewage tank to the rear area of ​​the TBM, and use the second mining wear-resistant multistage centrifugal pump to pump the drainage in the emergency drainage sewage tank to the rear area of ​​the TBM;

[0014] According to the amount of seepage and gushing water in the pumping and drainage sections of each pumping station, determine the intermittent or continuous start-up of the third mining wear-resistant multistage centrifugal pump, the fourth mining wear-resistant multistage centrifugal pump, the fifth mining wear-resistant multistage centrifugal pump, the sixth mining wear-resistant multistage centrifugal pump, the seventh mining wear-resistant multistage centrifugal pump or the eighth mining wear-resistant multistage centrifugal pump.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. The present invention sets a drainage system in the TBM area, a drainage system along the main tunnel, a drainage system in the intersection section of the main and branch tunnels, and a drainage system in the branch tunnel section, and combines a first pump station arranged under the TBM main beam, a second pump station arranged on the supporting trolley behind the TBM, a third pump station, a fourth pump station and a fifth pump station arranged in the main tunnel, a sixth pump station arranged at the intersection section of the main and branch tunnels, and a seventh pump station and an eighth pump station arranged in the branch tunnel. The eight pump stations are used to improve the comprehensive drainage capacity of the TBM in the process of downslope excavation and reverse slope drainage construction.

[0017] 2. The reverse slope drainage system of the present invention makes full use of the upstream location of the main tunnel construction and sets up a large transfer water reservoir at the intersection section of the main and branch tunnels. The large transfer water reservoir serves as a relay station for the reverse slope drainage system, which helps to improve the drainage capacity of the reverse slope drainage system without affecting the construction progress of the TBM tunnel construction.

[0018] 3. The maximum drainage capacity of the reverse slope drainage system of the present invention reaches 1300m 3 / h, multiple mining wear-resistant multi-stage centrifugal pumps adopt frequency conversion control, which can be managed in stages according to different water inflows, which can not only meet the drainage needs, but also save costs to the greatest extent, avoid the waste of resources caused by the traditional drainage system in normal drainage status, and solve the problem of insufficient drainage capacity in the event of a disaster.

[0019] 4. The working method of the reverse slope drainage system of the present invention is reasonably designed, easy to implement frequency conversion control, and has a wide range of applications.

[0020] In summary, the present invention arranges the first pumping station under the TBM main beam, arranges the second pumping station on the TBM rear supporting trolley, arranges the third pumping station, the fourth pumping station and the fifth pumping station in the main tunnel, arranges the sixth pumping station at the intersection of the main and branch tunnels, and arranges the seventh pumping station and the eighth pumping station in the branch tunnel. By combining the eight pumping stations, the comprehensive drainage capacity of the TBM during the downslope excavation and reverse slope drainage construction is improved, the upstream position of the main tunnel construction is fully utilized, and a large transfer water reservoir is set at the intersection of the main and branch tunnels. The large transfer water reservoir serves as a relay station of the reverse slope drainage system, which helps to improve the drainage capacity of the reverse slope drainage system without affecting the construction progress of the TBM tunnel construction.

[0021] The present invention is further described in detail below through the accompanying drawings and examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a principle block diagram of the reverse slope drainage system of the present invention.

[0023] Figure 2 It is a structural schematic diagram of the main-branch tunnel intersection section drainage system and the branch tunnel section drainage system of the present invention.

[0024] Figure 3 It is a schematic structural diagram of the transfer water storage tank of the present invention.

[0025] Description of reference numerals:

[0026] 1—first pumping station; 2—second pumping station; 3—third pumping station;

[0027] 4—the fourth pumping station; 5—the fifth pumping station; 6—the sixth pumping station;

[0028] 7—the seventh pumping station; 8—the eighth pumping station; 9—the normal drainage sewage tank;

[0029] 10—Emergency drainage sewage tank; 11—Sand discharge pump;

[0030] 12-1—First mining wear-resistant multistage centrifugal pump; 12-2—Second mining wear-resistant multistage centrifugal pump;

[0031] 12-3—Third mining wear-resistant multistage centrifugal pump; 12-4—Fourth mining wear-resistant multistage centrifugal pump;

[0032] 12-5—The fifth mine wear-resistant multistage centrifugal pump; 13—Large transfer water storage tank;

[0033] 14—The sixth mine wear-resistant multi-stage centrifugal pump; 15-1—Main tunnel; 15-2—Branch tunnel;

[0034] 16—Transfer reservoir of the first branch cave; 17—Transfer reservoir of the second branch cave;

[0035] 18-1—The seventh mine wear-resistant multistage centrifugal pump; 18-2—The eighth mine wear-resistant multistage centrifugal pump;

[0036] 19—concrete gravity retaining wall; 20—slag pile;

[0037] 21—sewage tank; 22—slag pit; 23—intersection section of main and branch tunnels;

[0038] 24—Emergency shelter; 25—Temporary slag storage hole. DETAILED DESCRIPTION

[0039] like Figure 1 , Figure 2 and Figure 3The reverse slope drainage system for TBM construction of a long-distance water diversion tunnel shown in the figure includes a drainage system in the TBM area, a drainage system along the main tunnel, a drainage system for the intersection section of the main and branch tunnels, and a drainage system for the branch tunnel section; the drainage system in the TBM area includes a first pump station 1 arranged below the TBM main beam and a second pump station 2 arranged on the TBM rear supporting trolley, the first pump station 1 includes a plurality of sand pumps 11 for pumping water into a normal drainage sewage tank 9 or an emergency drainage sewage tank 10 of the TBM rear supporting trolley, the second pump station 2 includes a plurality of first mining wear-resistant multistage centrifugal pumps 12-1 arranged outside the normal drainage sewage tank 9 and a plurality of second mining wear-resistant multistage centrifugal pumps 12-2 arranged outside the emergency drainage sewage tank 10; the main tunnel along-line drainage system includes a third pump station 3, a fourth pump station 4 and a fifth pump station 5 arranged in the main tunnel 15-1, The third pumping station 3 includes a third mining wear-resistant multistage centrifugal pump 12-3, the fourth pumping station 4 includes a fourth mining wear-resistant multistage centrifugal pump 12-4, and the fifth pumping station 5 includes a fifth mining wear-resistant multistage centrifugal pump 12-5; the main branch tunnel intersection section drainage system includes a sixth pumping station 6 and a large transfer water reservoir 13 arranged in the main branch tunnel intersection section 23, and the large transfer water reservoir 13 is provided with a plurality of sixth mining wear-resistant multistage centrifugal pumps 14 on the side near the main branch tunnel intersection; the branch tunnel section drainage system includes a seventh pumping station 7, an eighth pumping station 8, a first branch tunnel transfer water reservoir 16 and a second branch tunnel transfer water reservoir 17 arranged in the branch tunnel 15-2, a seventh mining wear-resistant multistage centrifugal pump 18-1 is arranged on one side of the first branch tunnel transfer water reservoir 16, and an eighth mining wear-resistant multistage centrifugal pump 18-2 is arranged on one side of the second branch tunnel transfer water reservoir 17.

[0040] In this embodiment, by setting up a drainage system in the TBM area, a drainage system along the main tunnel, a drainage system in the intersection section of the main and branch tunnels, and a drainage system in the branch tunnel section, the first pump station 1 arranged under the TBM main beam, the second pump station 2 arranged on the TBM rear supporting trolley, the third pump station 3 arranged in the main tunnel 15-1, the fourth pump station 4 and the fifth pump station 5, the sixth pump station 6 arranged in the intersection section of the main and branch tunnels, and the seventh pump station 7 and the eighth pump station 8 arranged in the branch tunnel 15-2 are combined to improve the comprehensive drainage capacity of the TBM during the downslope excavation and reverse slope drainage construction process; the maximum drainage capacity of the reverse slope drainage system reaches 1300m 3 / h, multiple mining wear-resistant multi-stage centrifugal pumps adopt frequency conversion control, which can be managed in stages according to different water inflows, which can not only meet the drainage needs, but also save costs to the greatest extent, avoid the waste of resources caused by the traditional drainage system in normal drainage status, and solve the problem of insufficient drainage capacity in the event of a disaster.

[0041] In this embodiment, since the space in the tunnel is small during TBM tunnel construction, in order to achieve the purpose of improving drainage capacity, the reverse slope drainage system makes full use of the upstream position of the main tunnel construction, and sets a large transfer reservoir 13 at the intersection of the main and branch tunnels. The large transfer reservoir 13 serves as a relay station for the drainage system, which can meet the drainage requirements and does not affect the progress of TBM tunnel construction. The volume of the large transfer reservoir 13 is 3000m 3 .

[0042] like Figure 2 As shown, in this embodiment, the large transfer water storage tank 13 includes a concrete bottom plate and a concrete gravity retaining wall 19 arranged around the concrete bottom plate, and a slag pile 20 is arranged on the outer side of the concrete gravity retaining wall 19 close to the upstream side of the main tunnel to prevent the impact of blasting from the upstream tunnel. The large transfer water storage tank 13 is equipped with a sewage tank 21 and a slag pit 22.

[0043] In actual use, by providing the slag pile 20 , the large transfer water storage tank 13 can be prevented from being impacted by the through-blasting of the upstream tunnel, thereby improving the safety of the large transfer water storage tank 13 .

[0044] In this embodiment, a refuge hole 24 is provided in the branch hole 15 - 2 , and an external sewage pool is provided outside the branch hole 15 - 2 .

[0045] In this embodiment, a temporary slag storage hole 25 is provided in the main-branch tunnel intersection section 23 .

[0046] like Figure 1 As shown, in this embodiment, the number of the sand discharge pumps 11 is 7, the number of the first mining wear-resistant multistage centrifugal pumps 12-1 is 2, the number of the second mining wear-resistant multistage centrifugal pumps 12-2 is 2, the number of the third mining wear-resistant multistage centrifugal pumps 12-3 is 2, the number of the fourth mining wear-resistant multistage centrifugal pumps 12-4 and the number of the fifth mining wear-resistant multistage centrifugal pumps 12-5 are both 1, the number of the sixth mining wear-resistant multistage centrifugal pumps 14 is 5, the number of the seventh mining wear-resistant multistage centrifugal pumps 18-1 and the number of the eighth mining wear-resistant multistage centrifugal pumps 18-2 are both 2.

[0047] In this embodiment, the long-distance open TBM tunnel includes a main tunnel 15-1, a branch tunnel 15-2 and a main-branch tunnel intersection section. The length of the main tunnel 15-1 is 17.4 km, and the longitudinal slope is 0.18%; the length of the branch tunnel 15-2 is 2579.493 m, and the longitudinal slope is 10.4%. There is no buffer platform in the middle of the branch tunnel 15-2, and the slope is straight to the bottom; the total drainage distance in the construction of the long-distance open TBM tunnel is 20 km, and the total drainage vertical height difference is 286 m, of which the vertical height difference of the branch tunnel 15-2 is 255 m, and the vertical height difference of the main tunnel 15-1 is 31 m; the TBM downslope excavation and reverse slope drainage construction method is adopted.

[0048] In this embodiment, the total drainage capacity of the first pump station 1 is 1214m 3 / h, the 7 sand pumps 11 are all arranged on the lower side of the TBM main beam, and the 7 sand pumps 11 are respectively marked as 1 # Sand pump, 2 # Sand pump, 3 # Sand pump, 4 # Sand pump, 5 # Sand pump, 6 # Sand pump and 7 # Sand pump, including 1 # Discharge capacity of sand pump, 2 # The displacement of the sand pump and 3 # The displacement of the sand pump is 30m 3 / h, lift is 46m, 4 # The displacement of the sand pump and 5 # The displacement of the sand pump is 162m 3 / h, lift is 66m, using 1 # Sand pump, 2 # Sand pump, 3 # Sand pump, 4 # Sand pump and 5 # The sand pump can discharge the sewage from the front end of the TBM into the normal drainage sewage tank 9; 6 # The displacement of the sand pump and 7 # The discharge capacity of the sand pump is 400m 3 / h, lift is 27m, using 6 # Sand pump or 7 # The sand pump can discharge the sewage from the front end of the TBM into the emergency drainage sewage tank 10; 5 # Sand pump, 6 # Sand pump and 7 # The sand removal pumps are all frequency-controlled and have adjustable flow rates.

[0049] In this embodiment, the total drainage capacity of the second pump station 2 is 850m 3 / h, the displacement of the two first mining wear-resistant multistage centrifugal pumps 12-1 is 100m 3 / h, with a head of 155m; the displacement of the two second-class wear-resistant multistage centrifugal pumps 12-2 is 325m 3 / h, the head is 385m, and all are frequency conversion controlled, with adjustable flow.

[0050] In this embodiment, the displacement of the third mining wear-resistant multistage centrifugal pump 12-3 is 100m 3 / h, the head is 195m; the displacement of the fourth mining wear-resistant multistage centrifugal pump 12-4 is 100m 3 / h, the head is 175m; the displacement of the fifth mining wear-resistant multistage centrifugal pump 12-5 is 250m 3 / h, the head is 120m.

[0051] In this embodiment, the total drainage capacity of the sixth pump station 6 is 1380m 3 / h, and the five sixth mining wear-resistant multistage centrifugal pumps 14 are marked as 1# centrifugal pump, 2# centrifugal pump, 3# centrifugal pump, 4# centrifugal pump and 5# centrifugal pump, wherein the displacement of 1# centrifugal pump and 2# centrifugal pump is 110m 3 / h, head is 102m; the displacement of 3# centrifugal pump is 660m 3 / h, head is 300m; the displacement of 4# centrifugal pump and 5# centrifugal pump is 250m 3 / h, lift is 320m.

[0052] In this embodiment, the volume of the first branch tunnel transfer reservoir 16 is 25m 3 The displacement of the two seventh mine wear-resistant multistage centrifugal pumps 18-1 is 110m 3 / h, and the lift is 102m.

[0053] In this embodiment, the volume of the second branch tunnel transfer reservoir 17 is 25m 3 The displacement of the two wear-resistant multistage centrifugal pumps 18-2 used in the Eighth Mine is 110m 3 / h, and the lift is 130m.

[0054] The present invention provides a working method of a reverse slope drainage system for TBM construction of a long-distance water transfer tunnel, the working method comprising:

[0055] When the water seepage at the face is between 0m 3 / h~320m 3 / h, start the normal drainage system to pump out water: according to the amount of water seepage at the face, determine the number of sand pumps 11 and the first mining wear-resistant multistage centrifugal pumps 12-1 to be started, use one or more sand pumps 11 to pump the water to the normal drainage sewage tank 9 on the supporting trolley behind the TBM; then use the first mining wear-resistant multistage centrifugal pump 12-1 to pump the water in the normal drainage sewage tank 9 to the rear area of ​​the TBM;

[0056] According to the amount of seepage and gushing water in the pumping and drainage sections of each pumping station, determine the intermittent or continuous start of the third mining wear-resistant multistage centrifugal pump 12-3, the fourth mining wear-resistant multistage centrifugal pump 12-4, the fifth mining wear-resistant multistage centrifugal pump 12-5, the sixth mining wear-resistant multistage centrifugal pump 14, the seventh mining wear-resistant multistage centrifugal pump 18-1 or the eighth mining wear-resistant multistage centrifugal pump 18-2;

[0057] When the water seepage at the face is between 320m 3 / h~1300m 3 / h, start the emergency drainage system to pump out water:

[0058] According to the amount of water seepage at the face, determine the number of sand pumps 11, the first mining wear-resistant multistage centrifugal pump 12-1, and the second mining wear-resistant multistage centrifugal pump 12-2 to be started, and use one or more sand pumps 11 to pump the drainage to the normal drainage sewage tank 9 and the emergency drainage sewage tank 10 of the matching trolley behind the TBM; then use the first mining wear-resistant multistage centrifugal pump 12-1 to pump the drainage in the normal drainage sewage tank 9 to the rear area of ​​the TBM, and use the second mining wear-resistant multistage centrifugal pump 12-2 to pump the drainage in the emergency drainage sewage tank 10 to the rear area of ​​the TBM;

[0059] According to the amount of seepage and gushing water in the pumping and drainage sections of each pumping station, determine the intermittent or continuous start-up of the third mining wear-resistant multistage centrifugal pump 12-3, the fourth mining wear-resistant multistage centrifugal pump 12-4, the fifth mining wear-resistant multistage centrifugal pump 12-5, the sixth mining wear-resistant multistage centrifugal pump 14, the seventh mining wear-resistant multistage centrifugal pump 18-1 or the eighth mining wear-resistant multistage centrifugal pump 18-2.

[0060] In actual use, the corresponding classification of pump stations at different levels in different flow ranges under normal drainage conditions is shown in Table 1:

[0061] Table 1 Corresponding classification of pumping stations at different flow intervals under normal drainage conditions

[0062]

[0063] In actual use, the corresponding classification of pump stations at different levels in different flow ranges under emergency drainage conditions is shown in Table 2:

[0064] Table 2 Corresponding classification of pumping stations at different levels under different flow ranges under emergency drainage conditions

[0065]

[0066]

[0067] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A reverse slope drainage system for TBM construction of a long-distance water transfer tunnel, characterized by: The invention comprises a drainage system in a TBM area, a drainage system along the main tunnel, a drainage system for the intersection of the main and branch tunnels, and a drainage system for the branch tunnel sections; the drainage system in the TBM area comprises a first pump station (1) arranged below the TBM main beam and a second pump station (2) arranged on the TBM rear supporting trolley, the first pump station (1) comprising a plurality of sand removal pumps (11) for pumping water into a normal drainage sewage tank (9) or an emergency drainage sewage tank (10) of the TBM rear supporting trolley, the second pump station (2) comprising a plurality of first mining wear-resistant multistage centrifugal pumps (12-1) arranged outside the normal drainage sewage tank (9) and a plurality of second mining wear-resistant multistage centrifugal pumps (12-2) arranged outside the emergency drainage sewage tank (10); the drainage system along the main tunnel comprises a third pump station (3), a fourth pump station (4) and a fifth pump station (5) arranged in the main tunnel (15-1), the third pump station (3) comprising a third mining wear-resistant multistage centrifugal pump (12-2) arranged outside the emergency drainage sewage tank (10); The fourth pump station (4) includes a fourth mining wear-resistant multistage centrifugal pump (12-4), and the fifth pump station (5) includes a fifth mining wear-resistant multistage centrifugal pump (12-5); the main branch tunnel intersection section drainage system includes a sixth pump station (6) and a large transfer water reservoir (13) arranged at the main branch tunnel intersection section (23), and the large transfer water reservoir (13) is provided with a plurality of sixth mining wear-resistant centrifugal pumps on one side of the main branch tunnel intersection. A multistage centrifugal pump (14); the branch tunnel section drainage system comprises a seventh pumping station (7), an eighth pumping station (8), a first branch tunnel transfer water reservoir (16) and a second branch tunnel transfer water reservoir (17) arranged in the branch tunnel (15-2); a seventh mining wear-resistant multistage centrifugal pump (18-1) is arranged on one side of the first branch tunnel transfer water reservoir (16); and an eighth mining wear-resistant multistage centrifugal pump (18-2) is arranged on one side of the second branch tunnel transfer water reservoir (17).

2. The reverse slope drainage system for TBM construction of a long-distance water transfer tunnel according to claim 1, characterized in that: The large transfer water storage tank (13) comprises a concrete bottom plate and a concrete gravity retaining wall (19) arranged around the concrete bottom plate. A slag pile (20) for preventing the upstream tunnel from being penetrated by blasting is arranged on the outer side of the concrete gravity retaining wall (19) on the upstream side of the main tunnel. The large transfer water storage tank (13) is equipped with a sewage tank (21) and a slag pit (22).

3. The reverse slope drainage system for TBM construction of a long-distance water transfer tunnel according to claim 1, characterized in that: A refuge hole (24) is arranged inside the branch hole (15-2), and an external sewage pool is arranged outside the branch hole (15-2).

4. The reverse slope drainage system for TBM construction of a long-distance water transfer tunnel according to claim 1, characterized in that: The main-branch tunnel intersection section (23) is provided with a temporary slag storage hole (25).

5. The reverse slope drainage system for TBM construction of a long-distance water transfer tunnel according to claim 1, characterized in that: The number of the sand discharge pumps (11) is 7, the number of the first mining wear-resistant multistage centrifugal pumps (12-1) is 2, the number of the second mining wear-resistant multistage centrifugal pumps (12-2) is 2, the number of the third mining wear-resistant multistage centrifugal pumps (12-3) is 2, the number of the fourth mining wear-resistant multistage centrifugal pumps (12-4) and the number of the fifth mining wear-resistant multistage centrifugal pumps (12-5) are both 1, the number of the sixth mining wear-resistant multistage centrifugal pumps (14) is 5, the number of the seventh mining wear-resistant multistage centrifugal pumps (18-1) and the number of the eighth mining wear-resistant multistage centrifugal pumps (18-2) are both 2.

6. A working method of a reverse slope drainage system for TBM construction of a long-distance water transfer tunnel as claimed in claim 1, characterized in that: The working method includes: When the water seepage at the face is between 0m 3 / h~320m 3 / h, start the normal drainage system to pump out water: determine the number of sand removal pumps (11) and first mining wear-resistant multistage centrifugal pumps (12-1) to be started according to the amount of water seepage at the face, use one or more sand removal pumps (11) to pump the drainage water to the normal drainage sewage tank (9) of the supporting trolley behind the TBM; then use the first mining wear-resistant multistage centrifugal pump (12-1) to pump the drainage water in the normal drainage sewage tank (9) to the rear area of ​​the TBM; According to the amount of seepage water in the pumping and drainage sections of each pumping station, determine the intermittent or continuous start of the third mining wear-resistant multistage centrifugal pump (12-3), the fourth mining wear-resistant multistage centrifugal pump (12-4), the fifth mining wear-resistant multistage centrifugal pump (12-5), the sixth mining wear-resistant multistage centrifugal pump (14), the seventh mining wear-resistant multistage centrifugal pump (18-1) or the eighth mining wear-resistant multistage centrifugal pump (18-2); When the water seepage at the face is between 320m 3 / h~1300m 3 / h, start the emergency drainage system to pump out water: According to the amount of water seepage at the face, the number of sand removal pumps (11), the first mining wear-resistant multistage centrifugal pump (12-1), and the second mining wear-resistant multistage centrifugal pump (12-2) required to be started is determined, and the drainage is pumped to the normal drainage sewage tank (9) and the emergency drainage sewage tank (10) of the supporting trolley behind the TBM by using one or more sand removal pumps (11); the drainage in the normal drainage sewage tank (9) is then pumped to the rear area of ​​the TBM by using the first mining wear-resistant multistage centrifugal pump (12-1), and the drainage in the emergency drainage sewage tank (10) is pumped to the rear area of ​​the TBM by using the second mining wear-resistant multistage centrifugal pump (12-2); According to the amount of seepage water in the pumping and drainage sections of each pumping station, determine the intermittent or continuous start-up of the third mining wear-resistant multistage centrifugal pump (12-3), the fourth mining wear-resistant multistage centrifugal pump (12-4), the fifth mining wear-resistant multistage centrifugal pump (12-5), the sixth mining wear-resistant multistage centrifugal pump (14), the seventh mining wear-resistant multistage centrifugal pump (18-1) or the eighth mining wear-resistant multistage centrifugal pump (18-2).

Images