Double-hole reverse slope TBM construction tunnel drainage pumping station

Abstract

The invention discloses a double-hole reverse slope TBM construction tunnel drainage pumping station which comprises a sewage sump (3) with a water inlet pipe (1), a water outlet pipe (2) is arranged on one side of the upper end face of the sewage sump (1), and a frame type two-layer platform is arranged above the sewage sump (3). A spiral submersible stirring system is arranged in the sewage sump (3); a submersible desilting pump (20) is arranged in the sewage sump (3) and is connected with the water outlet pipe (2) through a pipeline. According to the double-hole reverse slope TBM tunnel drainage pumping station, reasonable layered layout of electrical equipment is achieved through the frame type two-layer platform, space occupation and safety risks are reduced, meanwhile, sewage is continuously disturbed through the spiral submersible stirring system to prevent siltation, and the drainage pumping efficiency is improved. The problems that in the prior art, potential safety hazards are caused by dense equipment, and sediment deposition is difficult to clean are effectively solved.

Description

Technical Field

[0001] This invention relates to a drainage pumping station for TBM construction, and more particularly to a drainage pumping station for a double-tunnel reverse slope TBM construction tunnel. Background Technology

[0002] Currently, in the long and water-rich twin-tunnel construction, the continuous reverse slope excavation using two open-face TBMs is prone to TBM flooding due to seepage from the rear and water inrush at the tunnel face. To address this, cross passages are often used to construct water-sump pumping stations within the tunnel to pump water from the tunnel face to the outside in stages. While feasible, the design and construction of these pumping stations often present the following problems: 1. Each pumping station requires a large number of drainage equipment, including high-power pumps, frequency converters, transformers, high-voltage ring main units, high-voltage interconnection ring main units, and primary distribution boxes. The quantity and size of these equipment are significant, and the large number of high-voltage devices makes safety assurance difficult. 2. Tunnel wastewater is discharged to the outside of the tunnel through the pumping stations. During this process, the high mud content of the wastewater causes rapid sedimentation in the pumping stations. The numerous pumps deployed in the wastewater pumping stations, operating continuously, make cleaning after shutdown difficult, and manual cleaning is arduous and ineffective. Summary of the Invention

[0003] The purpose of this invention is to provide a drainage pumping station for a double-tunnel reverse slope TBM construction tunnel that effectively optimizes equipment layout to reduce space occupation and safety risks, while preventing sewage siltation to improve the stability of the drainage system.

[0004] The objective of this invention is achieved through the following technical solution: a drainage pumping station for a double-tunnel reverse-slope TBM construction tunnel, comprising a sewage tank with an inlet pipe, an outlet pipe provided on one side of the upper end face of the sewage tank, and a frame-type two-story platform provided above the sewage tank; a spiral submersible mixing system is provided inside the sewage tank; and a submersible sand-discharging pump is provided inside the sewage tank, the submersible sand-discharging pump being connected to the outlet pipe via a pipeline.

[0005] The frame-type two-story platform includes columns arranged around the top of the sewage tank, with crossbeams connecting the columns, steel plates laid on the crossbeams, and insulating rubber sheets laid on the upper surface of the steel plates; the steel plates and insulating rubber sheets constitute the two-story platform; frequency converter cabinets and high-voltage ring network cabinets are placed on the two-story platform; and a staircase leading to the two-story platform is provided on one side of the top of the sewage tank.

[0006] The spiral submersible mixing system includes at least seven submersible mixers installed in the sewage tank and located on one side of the inlet pipe, and at least three submersible mixers installed on one side of the outlet pipe. At least two submersible mixers are installed between the inlet pipe and the outlet pipe.

[0007] To facilitate lifting, a suspension lifting device for lifting the submersible mixer is installed on the top of the sewage tank. The suspension lifting device includes a lifting bracket, on which a hand-cranked winch is installed. The hand-cranked winch is connected to the submersible mixer via a steel wire.

[0008] Further description: a sliding rail is vertically arranged inside the sewage tank and corresponding to each submersible mixer; the submersible mixer is connected to the sliding rail via a sliding wheel connected to the submersible mixer; a triangular limiting platform is provided at the lower part of the sliding rail.

[0009] The sliding rails corresponding to the submersible mixers located at the inlet and outlet are connected to the inner wall of the sewage tank; an I-beam is longitudinally installed at the top of the sewage tank, and the upper part of the sliding rails corresponding to the submersible mixers located between the inlet and outlet is connected to the I-beam.

[0010] To facilitate the hoisting of the submersible mixer, a submersible sand pump hoisting mechanism is provided on the lower end face of the crossbeam.

[0011] The submersible sand pump hoisting mechanism includes a slide rail set on the lower end face of the crossbeam, and a hand-operated hoist is installed on the slide rail.

[0012] By adopting the above-mentioned technical solution, the dual-tunnel reverse slope TBM tunnel drainage pumping station provided in this application achieves a reasonable layered layout of electrical equipment through a frame-type two-story platform, reducing space occupation and safety risks. At the same time, it uses a spiral submersible mixing system to continuously disturb sewage to prevent siltation, effectively solving the safety hazards caused by dense equipment and the difficulty of cleaning silt deposits in the prior art. Attached Figure Description

[0013] The accompanying drawings of this invention are described below: Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the spiral submersible mixing system of the present invention; Figure 4 This is a layout diagram of the sewage tank of the spiral submersible mixing system of the present invention. Detailed Implementation

[0014] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. However, the present invention is not limited to these embodiments. Any improvements or substitutions based on the basic spirit of these embodiments shall still fall within the scope of protection claimed by the claims of the present invention.

[0015] Example 1: As Figure 1 , 2 As shown in Figures 3 and 4, a drainage pumping station for a double-tunnel reverse-slope TBM construction tunnel includes a sewage tank 3 with an inlet pipe 1, an outlet pipe 2 on one side of the upper end face of the sewage tank 1, and a frame-type two-story platform above the sewage tank 3; a spiral submersible mixing system is installed inside the sewage tank 3; and a submersible sand-discharging pump 20 is installed inside the sewage tank 3, which is connected to the outlet pipe 2 via a pipe.

[0016] The frame-type two-story platform can be understood as an elevated structure used to support and centrally house equipment, primarily aimed at optimizing the spatial layout of drainage equipment. Specifically, this platform can be constructed using steel structures or other materials with sufficient load-bearing capacity, and can take the form of a modular assembly. As a preferred implementation, the frame-type two-story platform is connected to the top of the sewage tank via support columns, and operational safety is enhanced by laying anti-slip or insulating materials. Its main purpose is to achieve centralized management of equipment, thereby reducing the safety hazards caused by the dispersed placement of high-pressure equipment.

[0017] Furthermore, a submersible helical mixing system refers to a device capable of continuously agitating wastewater to prevent sediment settling. In practical applications, this system can be implemented by installing multiple agitators, powered by electric motors, hydraulic drives, or other power sources. For example, the agitators can adopt paddle, helical, or turbine structures, and their installation positions can be adjusted according to the specific shape and size of the wastewater tank. Its main purpose is to maintain the suspended state of sediment in the wastewater, thereby reducing the amount of manual cleaning required.

[0018] The innovation of this application lies in the centralized arrangement of drainage equipment above the sewage tank via a frame-type two-story platform, thereby reducing the need for dispersed equipment on the ground and mitigating the safety challenges posed by a large number of high-pressure devices. Simultaneously, the introduction of a spiral submersible mixing system effectively suppresses the rapid sedimentation of silt in the sewage, avoiding the siltation and cleaning difficulties caused by sedimentation in traditional designs. These improvements specifically address the technical challenges of complex equipment layout and difficult sewage sedimentation treatment in tunnel drainage pumping stations.

[0019] The working principle of this embodiment is as follows: A drainage pumping station for a double-tunnel reverse-slope TBM construction tunnel integrates a sewage tank 3 with an inlet pipe 1, a frame-type two-story platform, a spiral submersible mixing system, a drainage submersible pump 20, and an outlet pipe 2, achieving optimized equipment layout and effective solutions to sewage sedimentation problems. The sewage tank 3 serves as the basic structure, receiving sewage from the tunnel and discharging it to a designated location, providing necessary storage space for the entire drainage process. The frame-type two-story platform is positioned above the sewage tank 3, forming an independent elevated operating area. This facilitates the centralized placement of drainage equipment such as frequency converters and high-voltage ring network cabinets 8, reducing the dispersed arrangement of equipment on the ground, mitigating safety challenges caused by a large number of high-voltage devices, and improving space utilization efficiency. Furthermore, the spiral submersible mixing system is installed within the sewage tank 3. Through continuous mixing, it keeps the sediment in the sewage suspended, effectively inhibiting sedimentation, reducing siltation in the tank, and avoiding the problem of high manual cleaning intensity and poor results caused by rapid sedimentation. The sewage is then pumped out by the submersible sand pump 20 and discharged through the outlet pipe 2. Therefore, the frame-type two-story platform and the spiral submersible mixing system work together. The former optimizes equipment management to solve safety risks, while the latter directly addresses the problem of sewage sedimentation. The combination of the two ensures the stability of pump station operation and ease of maintenance, overcoming the shortcomings of traditional designs such as cluttered equipment and difficult cleaning.

[0020] The frame-type two-story platform includes columns 4 arranged around the top 3 of the sewage tank, with crossbeams 5 connecting the columns 4, steel plates 6 laid on the crossbeams 5, and insulating rubber 7 laid on the upper surface of the steel plates 6; the steel plates 6 and the insulating rubber 7 constitute the two-story platform; frequency converter cabinets and high-voltage ring network cabinets 8 are placed on the two-story platform; and a staircase 9 leading to the two-story platform is provided on one side of the top of the sewage tank 3.

[0021] Specifically, the columns 4 refer to the supporting components vertically fixed around the top of the sewage tank 3. They can be made of steel pipes, I-beams, or other profiles with sufficient strength, aiming to provide stable vertical support for the entire second-floor platform. The crossbeams 5 are key components connecting the columns; they can be made of channel steel, H-beams, or rectangular tubing, forming a rigid frame system to evenly distribute equipment loads. Steel plates 6 are laid on the crossbeams 5, using either patterned or ordinary steel plates, providing a flat and robust bearing surface for easy equipment installation and personnel access. Insulating rubber 7 is laid on the upper surface of the steel plates 6, using corrosion-resistant, high-insulation rubber materials to enhance electrical insulation and block leakage paths.

[0022] In detail, this technical solution effectively solves the safety hazards and maintenance efficiency issues of equipment placement by systematically constructing a frame-type two-story platform. Columns 4 are installed around the top of the sewage tank 3, using the top edge of the tank as anchor points to form a ring-shaped support structure. This adapts to the circular cross-section of the tunnel, preventing platform tilting or displacement due to construction vibrations. The crossbeams 5 connect to the columns 4, forming a rigid frame system that evenly distributes equipment loads to each column, preventing localized stress concentration that could lead to structural deformation. The insulating rubber sheet 7 laid on the upper surface of the steel plate 6 further enhances electrical insulation protection capabilities, taking into account the operating characteristics of high-voltage equipment. Through the above structural design, the two-story platform achieves physical isolation between the equipment and the sewage environment, reducing the corrosive effects of moisture and sludge on the equipment. Furthermore, the frequency converter cabinet and high-voltage ring network cabinet 8 are centrally located on the two-story platform, optimizing equipment layout, reducing space occupation, and facilitating centralized monitoring and rapid maintenance. The staircase 9 located on one side of the top of the sewage tank 3 provides a safe and convenient passage for maintenance personnel, improving the timeliness of daily operations and emergency response.

[0023] The above technical solutions significantly improve the safety assurance capability of high-pressure equipment in the drainage pumping station of the double-bore reverse slope TBM tunnel, while also improving the ease of operation for equipment maintenance, providing reliable technical support for drainage operations during tunnel construction.

[0024] Further description: The spiral submersible mixing system includes at least seven submersible mixers 10 disposed in the sewage tank 3 and located on one side of the inlet pipe 1, and at least three submersible mixers 10 disposed on one side of the outlet pipe 2, with at least two submersible mixers 10 disposed between the inlet pipe 1 and the outlet pipe 2.

[0025] Specifically, the spiral submersible mixing system refers to a device that uses the rational arrangement of the number and position of submersible mixers 10 to achieve uniform mixing of sewage in the sewage tank 3 and prevent sedimentation. It can be implemented using a combination of submersible mixers with different power or speeds, aiming to provide differentiated mixing intensity for different areas based on the sewage flow characteristics. The number of submersible mixers 10 is optimized based on the sewage's sludge content, flow velocity, and sedimentation characteristics, with the aim of ensuring sufficient mixing coverage in each area without dead zones.

[0026] In detail, this scheme employs at least seven submersible mixers 10 in the inlet pipe 1 area to provide high-intensity mixing for the high mud content and rapid water flow characteristics, effectively dispersing the initial mud and sand and preventing its rapid accumulation into hard sediment. At least three submersible mixers are installed in the outlet pipe 2 area to maintain continuous agitation at the drainage end, preventing mud and sand buildup from affecting drainage efficiency. Simultaneously, at least two submersible mixers 10 are placed in the transition area between inlet pipe 1 and outlet pipe 2 to fill the mixing blind spot in the middle area, ensuring that the sewage in the entire tank remains in a uniform suspended state. This differentiated arrangement by area not only adapts to the dynamic characteristics of sewage flow in the tunnel but also significantly improves the system's self-cleaning capability. Furthermore, the above arrangement, combined with the overall structural design of the sewage tank, further optimizes the mixing effect, thereby reducing the need for manual cleaning and improving operational efficiency.

[0027] The above technical solution achieves comprehensive mixing and coverage of sewage in the sewage tank, solves the sedimentation problem caused by unreasonable arrangement of submersible mixers, significantly reduces the intensity of manual cleaning and improves the reliability of the drainage system.

[0028] Furthermore, a suspension lifting device for lifting the submersible mixer 10 is provided on the top of the sewage tank 3. The suspension lifting device includes a lifting bracket 11, and a hand-cranked winch 12 is provided on the lifting bracket 11. The hand-cranked winch 12 is connected to the submersible mixer 10 through a steel wire 13.

[0029] Specifically, a suspended lifting device refers to an auxiliary device that achieves vertical lifting of heavy objects through a mechanical structure. It can employ lifting mechanisms such as winches, pulley blocks, or coils, aiming to provide a convenient lifting method for submersible mixers, thereby facilitating maintenance and cleaning operations. The lifting support can be understood as the frame structure supporting the entire lifting device. It can be fixed to the top of the sewage tank through welding, bolting, or integral molding, ensuring stability and safety during the lifting process. The hand-cranked rubber wheel 12 is a manually driven rotating device that transmits power through gear transmission, chain transmission, or direct hand cranking. Its purpose is to avoid safety hazards associated with electrical equipment in humid environments and to simplify the operation process.

[0030] In detail, this technical solution fundamentally solves the problem of difficult maintenance of the submersible mixer 10 by integrating a suspension lifting device on top of the sewage tank 3. The location design of the suspension lifting device allows operators to lift the submersible mixer without entering the sewage environment, effectively avoiding safety risks such as slipping and drowning that may be encountered during traditional manual cleaning. The lifting bracket 11 is installed based on the structural stability of the top of the sewage tank 3, and can withstand the effects of tunnel vibration and humid environment, ensuring that the device will not shift or fail during long-term use. The hand-cranked rubber wheel 12, as the core drive component, adopts a purely manual operation mechanism, which not only avoids the danger of electric shock, but also has high reliability and ease of maintenance due to its simple mechanical structure. The steel wire 13, as a connector, utilizes its corrosion resistance and high strength to achieve a smooth transmission of lifting force, avoiding the risk of equipment falling due to connection failure. In addition, this solution, combined with the layout of the submersible mixer in the sewage tank, further optimizes the overall maintenance efficiency, demonstrating the ingenuity of the design.

[0031] Through the above technical solutions, the lifting and maintenance of submersible mixers can be completed safely and efficiently, significantly reducing the intensity of manual operation and effectively eliminating the safety hazards of personnel falling or being electrocuted.

[0032] Furthermore, a sliding rail 14 is vertically arranged inside the sewage tank 3 and corresponding to each submersible mixer 10. The submersible mixer 10 is connected to the sliding rail 14 through a sliding wheel 15 connected to the submersible mixer 10. A triangular limiting platform 16 is provided at the lower part of the sliding rail 14.

[0033] Specifically, the sliding track 14 refers to the structure that provides a vertical guide path for the submersible mixer. It can be a straight guide rail made of metal or a composite guide rail with reinforcing ribs, the purpose of which is to ensure the precise vertical movement of the submersible mixer. The sliding wheel 15 can be understood as a rolling component installed on the submersible mixer 10 and used in conjunction with the sliding track 14. It can achieve low-friction sliding through bearing-type rollers or self-lubricating sleeves, the purpose of which is to reduce movement resistance and prevent sludge from getting stuck. The triangular limiting platform 16 refers to the limiting device set at the bottom of the sliding track 14 to limit the sinking depth of the submersible mixer 10. It can be a welded fixed or detachable triangular support structure, the purpose of which is to prevent the equipment from sinking excessively into the sludge.

[0034] In detail, this solution provides stable vertical guidance for the submersible mixer 10 through the sliding rail 14, enabling the equipment to move precisely along a fixed trajectory and effectively avoiding deviation and swaying caused by water flow disturbance. The cooperative design of the sliding wheel 15 and the sliding rail 14 achieves smooth sliding with low friction, ensuring flexible adjustment of the mixer even in wastewater environments with high sludge content. The triangular limiting platform 16, as a key limiting structure, prevents the mixer from sinking excessively through its stable triangular design, protecting the equipment from sludge corrosion. These components together constitute a complete guiding and limiting system, which not only improves the operational safety of the submersible mixer but also significantly reduces maintenance difficulty and manual cleaning intensity.

[0035] In addition, this scheme works in conjunction with the suspended lifting device in the aforementioned double-slope TBM tunnel drainage pumping station. The sliding track system provides additional stability for the submersible mixer, allowing the equipment to obtain the lifting force of the suspended device during lifting and lowering, while also maintaining precise position control through the sliding track system, thus creating a more reliable operating environment.

[0036] In this application, the sliding rails 14 corresponding to the submersible mixer 10 located at the inlet pipe 1 and the outlet pipe 2 are connected to the inner wall of the sewage tank 3; an I-beam 17 is longitudinally arranged at the top of the sewage tank 3, and the upper part of the sliding rails 14 corresponding to the submersible mixer 10 located between the inlet pipe 1 and the outlet pipe 2 is connected to the I-beam 17.

[0037] Specifically, the sliding track 14 refers to the guide structure used to guide the submersible mixer 10 along a predetermined path. It can be made of stainless steel to enhance corrosion resistance, and its purpose is to ensure the stability of the submersible mixer 10 in areas with high water flow impact. The I-beam 17 is a type of steel with an I-shaped cross-section, which can evenly distribute the load using its rigid support characteristics. Its purpose is to provide a reliable top fixing point for the sliding track in the middle area, avoiding occupying the internal operating space of the sewage tank.

[0038] In detail, this solution resolves the conflict between track stability and operating space through a differentiated design of the sliding track connection method. The sliding tracks 14 at the inlet pipe 1 and outlet pipe 2 are directly connected to the inner wall of the sewage tank 3. This connection method fully utilizes the structural strength of the inner wall, effectively resisting water flow impact and preventing track loosening or displacement, thus ensuring the stable operation of the submersible mixer under high-load conditions. The sliding tracks 14 in the middle area are fixed at the top using I-beams 17. This design not only avoids the encroachment on maintenance access caused by traditional inner wall fixing methods but also ensures the vertical stability of the tracks through the uniform load-bearing characteristics of the I-beams 17. Furthermore, the top fixing method maximizes the use of the internal space of the tank, facilitating personnel access for maintenance and also enabling rapid removal of sediment and sludge, significantly improving cleaning efficiency. This differentiated fixing method, tailored to the characteristics of different areas, ensures both the reliability of equipment operation and optimizes the utilization efficiency of the operating space.

[0039] To facilitate hoisting, a submersible sand pump hoisting mechanism is provided on the lower end face of the crossbeam 5.

[0040] Specifically, the submersible sand pump hoisting mechanism refers to a specialized device for lifting and maintaining the submersible sand pump 20, which can be implemented using a slide rail in conjunction with a hand-operated hoist. The slide rail is a guide structure fixed to the lower end face of the crossbeam, providing a stable movement path for the hand-operated hoist; the hand-operated hoist is the core component for lifting and moving the submersible sand pump, and can be manually driven to complete the lifting and movement of heavy objects. The purpose of introducing this technical feature is to solve the problem of inconvenient lifting of the submersible sand pump 20, while avoiding complex handling in areas with dense high-pressure equipment, thereby reducing safety risks and improving maintenance efficiency.

[0041] In detail, this solution integrates a dedicated hoisting mechanism on the lower end of the steel plate of the framed two-story platform, making full use of the existing structural space. This allows workers to operate directly without the need for additional temporary scaffolding or entering the sewage tank. The upper end of beam 5 supports equipment such as the frequency converter cabinet and high-voltage ring network cabinet, while the hoisting mechanism on the lower end tightly integrates the hoisting point with the operating platform, significantly reducing manual labor intensity. Furthermore, the positioning design of the hoisting mechanism simplifies the lifting and lowering process of the submersible sand pump, reducing manual intervention and effectively alleviating the cleaning intensity problem caused by sewage sedimentation. This design not only improves maintenance efficiency but also forms a good working relationship with the spiral submersible mixing system inside the sewage tank, ensuring the stable operation of the entire drainage pumping station.

[0042] The above technical solutions have achieved the goal of convenient lifting and maintenance of submersible sand pumps, while solving the problems of high operational difficulty and high safety risks caused by the lack of dedicated hoisting structures.

[0043] The submersible sand pump hoisting mechanism includes a slide rail 18 set on the lower end face of the crossbeam 5, and a hand-operated hoist 19 is installed on the slide rail 18.

[0044] Specifically, the slide rail 18 refers to a linear device used to guide and limit the movement trajectory. It can be implemented using a straight track, an arc track, or a combined track structure made of metal. Its purpose is to provide a stable guiding path for the movement of the submersible mixer, ensuring that the equipment slides smoothly along a predetermined trajectory during hoisting, avoiding the risk of shaking or collision caused by random movement. The hand chain hoist 19 is a manual lifting device that can achieve the lifting and lowering of heavy objects through a chain drive mechanism and gear set design. Its purpose is to allow for the smooth lifting of the submersible mixer through simple manual operation, significantly reducing the physical exertion of maintenance personnel.

[0045] In detail, this solution utilizes the existing structure of the second-floor platform as a support base by setting a slide rail 18 on the lower end face of the crossbeam 5, eliminating the need for an additional independent support system. This simplifies the overall structure and enhances the precise control of movement. The hand-operated hoist 19, installed on the slide rail 18, ensures close coordination between the lifting action and the guide rail, guaranteeing uniform force distribution and process controllability. This effectively prevents accidental detachment or damage to the equipment during lifting due to sudden uneven force. Especially in conditions with high sludge content and rapid sedimentation in sewage, this design provides a reliable guarantee for quickly cleaning sediment from the water tank. Furthermore, by organically integrating the hoisting mechanism with the second-floor platform, not only is the spatial layout optimized, but the safety and efficiency of the maintenance process are significantly improved, solving the problems of unstable equipment movement and laborious, time-consuming manual lifting in traditional methods.

[0046] Previously, the sewage tanks inside the tunnel were cleaned once a month, requiring 8 people and a week to clean each tank, along with a shuttle car for sludge removal. Now, the sewage is discharged externally, and a single excavator is used for centralized cleaning outside the tunnel, only increasing the amount of sludge to be removed from the sedimentation tanks. The wages for the cleaning personnel inside the tunnel are 12,000 yuan per month. The shuttle car consumes 200 liters of diesel fuel per day, at a price of 8 yuan per liter. Each set of spiral mixing systems costs approximately 11,000 yuan. The annual savings in cleaning and sludge removal costs per sewage tank are 12,000 yuan / month * 8 people * 12 months + 110 liters * 8 yuan * 7 days * 12 months - 11,000 yuan * 12 units = 1,093,900 yuan.

Claims

1. A drainage pumping station for a double-tunnel reverse-slope TBM construction tunnel, comprising a sewage tank (3) with an inlet pipe (1), and an outlet pipe (2) provided on one side of the upper end face of the sewage tank (1), characterized in that: A frame-type two-story platform is provided above the sewage tank (3); a spiral submersible mixing system is provided inside the sewage tank (3); a submersible sand pump (20) is provided inside the sewage tank (3), and the submersible sand pump (20) is connected to the outlet pipe (2) through a pipe.

2. The drainage pumping station for a double-tunnel reverse-slope TBM construction tunnel as described in claim 1, characterized in that: The frame-type two-story platform includes columns (4) set around the top (3) of the sewage tank, with crossbeams (5) connecting the columns (4) on the columns (4), steel plates (6) laid on the crossbeams (5), and insulating rubber (7) laid on the upper surface of the steel plates (6); the steel plates (6) and the insulating rubber (7) constitute the two-story platform; frequency converter cabinets and high-voltage ring network cabinets (8) are placed on the two-story platform; and a staircase (9) leading to the two-story platform is set on one side of the top of the sewage tank (3).

3. The drainage pumping station for a double-tunnel reverse-slope TBM construction tunnel as described in claim 2, characterized in that: The spiral submersible mixing system includes at least seven submersible mixers (10) installed in the sewage tank (3) and located on one side of the inlet pipe (1), and at least three submersible mixers (10) installed on one side of the outlet (2). At least two submersible mixers (10) are installed between the inlet pipe (1) and the outlet (2).

4. The drainage pumping station for a double-tunnel reverse-slope TBM construction tunnel as described in claim 3, characterized in that: in The top of the sewage tank (3) is provided with a suspension lifting device for lifting the submersible mixer (10). The suspension lifting device includes a lifting bracket (11) and a hand-cranked winch (12) is provided on the lifting bracket (11). The hand-cranked winch (12) is connected to the submersible mixer (10) through a steel wire (13).

5. The drainage pumping station for a double-tunnel reverse-slope TBM construction tunnel as described in claim 4, characterized in that: in The sewage tank (3) is vertically provided with a sliding rail (14) corresponding to each submersible mixer (10). The submersible mixer (10) is connected to the sliding rail (14) through a sliding wheel (15) connected to the submersible mixer (10). A triangular limiting platform (16) is provided at the lower part of the sliding rail (14).

6. The drainage pumping station for a double-tunnel reverse-slope TBM construction tunnel as described in claim 5, characterized in that: The sliding rail (14) corresponding to the submersible mixer (10) located at the inlet pipe (1) and the outlet (2) is connected to the inner wall of the sewage tank (3); an I-beam (17) is longitudinally arranged on the top of the sewage tank (3), and the upper part of the sliding rail (14) corresponding to the submersible mixer (10) located between the inlet pipe (1) and the outlet (2) is connected to the I-beam (17).

7. The drainage pumping station for a dual-tunnel reverse-slope TBM construction tunnel as described in claim 6, characterized in that: A submersible sand pump hoisting mechanism is provided on the lower end face of the crossbeam (5).

8. The drainage pumping station for a double-tunnel reverse-slope TBM construction tunnel as described in claim 7, characterized in that: The submersible sand pump hoisting mechanism includes a slide rail (18) set on the lower end face of the crossbeam (5), and a hand-operated hoist (19) is set on the slide rail (18).

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