Tunnel boring machine drainage system and tunnel boring machine

Abstract

The invention provides a tunnel boring machine drainage system and a tunnel boring machine, and belongs to the technical field of tunnel boring. The tunnel boring machine drainage system comprises a screening unit and a sewage tank, and further comprises a fine screening mechanism and a slurry storage tank used for receiving water-containing muck screened by the fine screening mechanism, and the screening particle size of the fine screening mechanism is smaller than that of the screening unit. The bottom of the sewage tank is connected with a first slurry conveying pipeline used for conveying water-containing muck in the sewage tank into the fine screening mechanism, the slurry storage tank is connected with a second slurry conveying pipeline used for conveying purified water-containing muck into the sewage tank, and slurry conveying pumps are arranged on the first slurry conveying pipeline and the second slurry conveying pipeline respectively. Water-containing muck in the sewage tank can be purified, deposits in the sewage tank can be removed in time, further discharge of the water-containing muck in the sewage tank is facilitated, manual desilting can be conducted without shutdown, and therefore manpower and material resources are saved.

Description

Technical Field

[0001] The invention relates to a tunnel boring machine drainage system and a tunnel boring machine, belonging to the technical field of tunnel boring. Background Art

[0002] During the construction of the tunnel boring machine, a large amount of water-containing slag will inevitably be produced in the tunnel. The main sources are sewage caused by washing the pipe segments during civilized construction of the tunnel, sewage and sludge generated by the gushing of the screw conveyor, etc. This type of water-containing slag is characterized by high water content, poor particle grading, and the presence of large-size slag, so it cannot be directly discharged with common water pumps. Therefore, in the past, it was often collected in marshaling slag cars during construction and then transported to the outside of the tunnel. However, due to the high water content of the slag, the number of marshaling is extremely large, and the slag discharge takes a long time, which seriously restricts the excavation efficiency.

[0003] In this regard, the Chinese utility model patent with authorization announcement number CN215828487U discloses a slag-water separation device and a shield machine using the device, wherein the slag-water separation device is mounted on a trailer, and includes a coarse screening unit connected to a front-end slag-water discharge mechanism, the discharge port of the coarse screening unit is connected to a sewage tank and a secondary screening unit, the sewage tank is used to receive the screened mud, and the sewage tank is discharged by a slurry discharge pump. The front-end slag water discharge mechanism is a screw conveyor or a mud pump discharge pipe or a slag hopper. The water-containing slag discharged by the front-end slag water discharge mechanism first enters the pressure relief box and then enters the coarse screening unit. The coarse screening unit separates the water-containing slag, and a part of the low-water content slag enters the slag box or continuous belt conveyor. The remaining water-containing slag passes through the pre-screening slot of the coarse screening unit, and then selects the discharge path according to whether the slurry discharge pump can discharge. If it can be discharged, it chooses to enter the sewage tank. If it cannot be discharged, it enters the secondary screening unit. The mud and mud water after the secondary screening enter the sewage tank and are discharged through the slurry discharge pump. The slag screened out by the secondary screening is discharged through the slag box or continuous belt conveyor.

[0004] The above-mentioned slag-water separation device can discharge the accumulated water in the equipment without stopping the machine, and realizes the separation of slag and water. Only the separated low-water content slag is discharged through the slag box or continuous belt conveyor, and the rest enters the sewage tank and is discharged through the slurry pump, which reduces the number of groups required and improves the excavation efficiency. However, the water-containing slag enters the sewage tank continuously. Although it has been screened, it is still mixed with a large amount of slag. Even if an air blowing and stirring unit is set in the sewage tank, due to the large particle size of the slag, it will still cause the slag to settle in the sewage tank after a period of use. In order to ensure the smooth progress of the work, it is necessary to shut down regularly and manually dredge, which is time-consuming and labor-intensive. Summary of the invention

[0005] The object of the present invention is to provide a tunnel boring machine drainage system to solve the problem that the sewage tank in the prior art will cause soil deposition after long-term use, requiring regular shutdown and manual dredging, which is time-consuming and labor-intensive; the object of the present invention is also to provide a tunnel boring machine to solve the above-mentioned problem.

[0006] To achieve the above purpose, the tunnel boring machine drainage system in the present invention adopts the following technical solutions: The drainage system of a tunnel boring machine comprises a screening unit for screening water-containing debris generated by tunnel boring machine construction and a sewage tank for receiving the water-containing debris screened by the screening unit. The drainage system of the tunnel boring machine also comprises a fine screening mechanism for finely screening the water-containing debris in the sewage tank and a slurry storage tank for receiving the water-containing debris screened by the fine screening mechanism. The screening particle size of the fine screening mechanism is smaller than the screening particle size of the screening unit. A first slurry delivery pipeline for transporting the water-containing debris in the sewage tank to the fine screening mechanism is connected to the bottom of the sewage tank. A second slurry delivery pipeline for transporting the purified water-containing debris to the sewage tank is connected to the slurry storage tank. Slurry delivery pumps are respectively provided on the first slurry delivery pipeline and the second slurry delivery pipeline.

[0007] The beneficial effect of the above technical solution is that the present invention belongs to an improved invention, and the improvement lies in the addition of a fine screening mechanism and a slurry storage tank. The water-containing debris in the sewage tank is transported to the fine screening mechanism through the first slurry pipeline at the bottom and the slurry pump on the first slurry pipeline. The fine screening mechanism can finely screen the water-containing debris in the sewage tank, and the screening particle size of the fine screening mechanism is smaller than the screening particle size of the screening unit, so that finer water-containing debris enters the slurry storage tank. Finally, the water-containing debris in the slurry storage tank is transported to the sewage tank through the second slurry pipeline and the slurry pump on the second slurry pipeline, which is equivalent to purifying the water-containing debris in the sewage tank, and can timely remove the sediment in the sewage tank, which is conducive to the further discharge of the water-containing debris in the sewage tank. There is no need to stop the machine for manual dredging, thereby saving manpower and material resources.

[0008] Furthermore, a partition is provided in the sewage tank, which divides the space in the sewage tank into a sewage chamber and a clean water chamber. The sewage chamber is used to receive the water-containing debris after screening by the screening unit. The first slurry pipeline is connected to the bottom of the sewage chamber. The top of the partition is lower than the top of the side wall of the sewage tank so that the water-containing debris in the sewage chamber can pass over the partition and reach the clean water chamber. The clean water chamber is connected to a slurry discharge pipeline for discharging the water-containing debris to the outside of the tunnel, and a slurry discharge pump is provided on the slurry discharge pipeline.

[0009] Furthermore, the outlet end of the second slurry conveying pipeline is located in the clean water chamber or directly above the clean water chamber.

[0010] Further, the screening unit consists of only the pre-screening screen.

[0011] Furthermore, the tunnel boring machine drainage system also includes an internal soil bin drainage pipeline for discharging water accumulated in the soil bin and an internal main engine drainage pipeline for discharging water accumulated in the main engine. The internal soil bin drainage pipeline is provided with an internal soil bin drainage pump, and the internal main engine drainage pipeline is provided with an internal main engine drainage pump. The internal soil bin drainage pipeline and the internal main engine drainage pipeline merge into a sewage tank inlet pipeline, and the outlet end of the sewage tank inlet pipeline is connected to the inlet end of the screening unit.

[0012] Furthermore, the tunnel boring machine drainage system also includes an emergency drainage pipeline for directly discharging the accumulated water in the main machine to the outside of the tunnel. The emergency drainage pipeline is provided with an emergency drainage pump, and the power of the emergency drainage pump is greater than the power of the drainage pump in the soil bin and the drainage pump in the main machine.

[0013] Furthermore, at least two drainage pipes are provided in the soil bin, and the inlet end of each drainage pipe in the soil bin is used to be respectively connected to different slurry discharge holes arranged above and below the soil bin partition, and a filter is provided at the inlet end of each drainage pipe in the soil bin.

[0014] Furthermore, a liquid level sensor is provided on the slurry storage tank, and the liquid level sensor is used to connect with the slurry pump on the second slurry pipeline through the control center, so as to control the slurry pump on the second slurry pipeline to start or increase the power when the liquid level in the slurry storage tank is too high, and to control the slurry pump on the second slurry pipeline to shut down or reduce the power when the liquid level is too low.

[0015] Furthermore, the fine screening mechanism includes a cyclone and a dewatering screen arranged above the slurry storage tank. The outlet of the first slurry delivery pipeline is connected to the inlet of the cyclone. The light material outlet of the cyclone allows the water-containing soil with lower density to flow directly into the slurry storage tank, and the heavy material outlet of the cyclone allows the water-containing soil with higher density to flow onto the dewatering screen. The dewatering screen allows the screened water-containing soil to fall into the slurry storage tank.

[0016] To achieve the above purpose, the tunnel boring machine in the present invention adopts the following technical solutions: A tunnel boring machine comprises a main machine, a rear supporting trailer and a drainage system, wherein the drainage system comprises a screening unit for screening water-containing debris generated by the tunnel boring machine construction and a sewage tank for receiving the water-containing debris screened by the screening unit, the drainage system also comprises a fine screening mechanism for finely screening the water-containing debris in the sewage tank and a slurry storage tank for receiving the water-containing debris screened by the fine screening mechanism, the screening particle size of the fine screening mechanism is smaller than the screening particle size of the screening unit, a first slurry delivery pipeline for transporting the water-containing debris in the sewage tank to the fine screening mechanism is connected to the bottom of the sewage tank, a second slurry delivery pipeline for transporting the purified water-containing debris to the sewage tank is connected to the slurry storage tank, and slurry delivery pumps are respectively provided on the first slurry delivery pipeline and the second slurry delivery pipeline.

[0017] The beneficial effect of the above technical solution is that the present invention belongs to an improved invention, and the improvement lies in the addition of a fine screening mechanism and a slurry storage tank. The water-containing debris in the sewage tank is transported to the fine screening mechanism through the first slurry pipeline at the bottom and the slurry pump on the first slurry pipeline. The fine screening mechanism can finely screen the water-containing debris in the sewage tank, and the screening particle size of the fine screening mechanism is smaller than the screening particle size of the screening unit, so that finer water-containing debris enters the slurry storage tank. Finally, the water-containing debris in the slurry storage tank is transported to the sewage tank through the second slurry pipeline and the slurry pump on the second slurry pipeline, which is equivalent to purifying the water-containing debris in the sewage tank, and can timely remove the sediment in the sewage tank, which is conducive to the further discharge of the water-containing debris in the sewage tank. There is no need to stop the machine for manual dredging, thereby saving manpower and material resources.

[0018] Furthermore, a partition is provided in the sewage tank, which divides the space in the sewage tank into a sewage chamber and a clean water chamber. The sewage chamber is used to receive the water-containing debris after screening by the screening unit. The first slurry pipeline is connected to the bottom of the sewage chamber. The top of the partition is lower than the top of the side wall of the sewage tank so that the water-containing debris in the sewage chamber can pass over the partition and reach the clean water chamber. The clean water chamber is connected to a slurry discharge pipeline for discharging the water-containing debris to the outside of the tunnel, and a slurry discharge pump is provided on the slurry discharge pipeline.

[0019] Furthermore, the outlet end of the second slurry conveying pipeline is located in the clean water chamber or directly above the clean water chamber.

[0020] Further, the screening unit consists of only the pre-screening screen.

[0021] Furthermore, the drainage system also includes an internal drainage pipeline in the soil bin for discharging water accumulated in the soil bin and an internal drainage pipeline in the main unit for discharging water accumulated in the main unit. The internal drainage pipeline in the soil bin is provided with an internal drainage pump in the soil bin, and the internal drainage pipeline in the main unit is provided with an internal drainage pump in the main unit. The internal drainage pipeline in the soil bin and the internal drainage pipeline in the main unit merge into a sewage tank inlet pipeline, and the outlet end of the sewage tank inlet pipeline is connected to the inlet end of the screening unit.

[0022] Furthermore, the drainage system also includes an emergency drainage pipeline for directly discharging the accumulated water in the main engine to the outside of the tunnel. The emergency drainage pipeline is provided with an emergency drainage pump, and the power of the emergency drainage pump is greater than the power of the drainage pump in the soil bin and the drainage pump in the main engine.

[0023] Furthermore, at least two drainage pipes are provided in the soil bin, and the inlet end of each drainage pipe in the soil bin is used to be respectively connected to different slurry discharge holes arranged above and below the soil bin partition, and a filter is provided at the inlet end of each drainage pipe in the soil bin.

[0024] Furthermore, a liquid level sensor is provided on the slurry storage tank, and the liquid level sensor is used to connect with the slurry pump on the second slurry pipeline through the control center, so as to control the slurry pump on the second slurry pipeline to start or increase the power when the liquid level in the slurry storage tank is too high, and to control the slurry pump on the second slurry pipeline to shut down or reduce the power when the liquid level is too low.

[0025] Furthermore, the fine screening mechanism includes a cyclone and a dewatering screen arranged above the slurry storage tank. The outlet of the first slurry delivery pipeline is connected to the inlet of the cyclone. The light material outlet of the cyclone allows the water-containing soil with lower density to flow directly into the slurry storage tank, and the heavy material outlet of the cyclone allows the water-containing soil with higher density to flow onto the dewatering screen. The dewatering screen allows the screened water-containing soil to fall into the slurry storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of a tunnel boring machine drainage system embodiment 1 of the present invention; Figure 2 for Figure 1 An enlarged view of the middle slag water separation device; Figure 3 for Figure 1 An enlarged view of the water-containing slag purification device; Figure 4 It is a partial schematic diagram of Example 2 of the drainage system of a tunnel boring machine in the present invention; Figure 5 It is a partial schematic diagram of Embodiment 3 of the drainage system of a tunnel boring machine in the present invention; Figure 6 It is a partial schematic diagram of Example 4 of the tunnel boring machine drainage system in the present invention.

[0027] In the figure: 1, slag-water separation device; 1-1, pre-selection screen; 1-2, sewage tank; 1-2-1, sewage chamber; 1-2-2, water purification chamber; 1-2-3, partition; 1-3, first slurry delivery pipeline; 1-4, first slurry delivery pump; 1-5, slurry discharge pipeline; 1-6, slurry discharge pump; 1-7, first belt conveyor; 1-8, mechanical stirring rod; 1-9, first liquid level sensor; 2, water-containing slag purification device; 2-1, integrated cyclone separator; 2-2, dewatering screen; 2-3, slurry storage tank; 2- 4. The second slurry delivery pipeline; 2-5. The second slurry delivery pump; 2-6. The second belt conveyor; 2-7. The second liquid level sensor; 3. The sewage tank water inlet pipeline; 3-1. The spare pipeline; 3-2. The valve; 4. The drainage pipeline in the soil bin; 5. The drainage pump in the soil bin; 5-1. The drainage pump in the soil bin; 5-2. The drainage pump in the soil bin; 6. The drainage pipeline in the main engine; 7. The drainage pump in the main engine; 7-1. The drainage pump in the main engine; 8. The emergency drainage pipeline; 9. The emergency drainage pump; 10. The soil bin partition; 11. The filter. DETAILED DESCRIPTION

[0028] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0029] In response to the technical problems existing in the prior art, the basic concept of the present invention is to finely screen the water-containing debris in the sewage tank, and then discharge the screened water-containing debris into the sewage tank, so as to avoid the debris deposition caused by the large particle size of the debris in the sewage tank affecting the smooth discharge, saving manpower and material resources and improving the excavation efficiency.

[0030] Embodiment 1 of the drainage system of a tunnel boring machine in the present invention: like Figure 1 As shown, the drainage system of the tunnel boring machine includes two parts: slag water discharge and slag water separation. The slag water separation includes a slag water separation device 1 and a water-containing slag soil purification device 2. The slag water discharge is a graded and zoned discharge, which is divided into several parts such as soil bin drainage, main machine drainage, emergency drainage and rear supporting drainage. Among them, the soil bin drainage part specifically includes a soil bin drainage pipeline 4 for discharging the accumulated water in the soil bin (mainly from the accumulated water between the tunnel face and the cutter head). The soil bin drainage pipeline 4 is provided with a soil bin drainage pump 5. In this embodiment, two soil bin drainage pipelines 4 are provided, and the soil bin drainage pumps 5 on the two soil bin drainage pipelines 4 are diaphragm pumps. The soil bin partition 10 is provided with slurry discharge holes spaced up and down. The inlet ends of each soil bin drainage pipeline 4 are respectively connected to different slurry discharge holes, and the inlet ends of each soil bin drainage pipeline 4 are provided with a filter screen 11, which can preliminarily filter the slag with larger particle size. When drainage is required, the drainage pump 5 in the soil bin is started. Under the power of the drainage pump 5 in the soil bin, the mud in the soil bin passes through the filter screen 11 into the drainage pipeline 4 in the soil bin and is transported to the slag-water separation device 1.

[0031] The drainage part inside the main machine specifically includes a drainage pipe 6 inside the main machine for discharging water accumulated inside the main machine (such as sewage caused by flushing the pipe segments during tunnel construction and sewage generated by the gushing of the screw conveyor). The drainage pipe 6 inside the main machine is provided with a drainage pump 7 inside the main machine. The drainage pump 7 inside the main machine in this embodiment is a submersible pump. The drainage pipe 4 inside the soil bin and the drainage pipe 6 inside the main machine merge into a sewage tank inlet pipe 3. The slag-water separation device 1 includes a screening unit and a sewage tank 1-2 for receiving the water-containing slag screened by the screening unit. The outlet end of the sewage tank inlet pipe 3 is connected to the inlet end of the screening unit, so as to screen the water-containing slag generated by the construction of the tunnel boring machine.

[0032] The drainage pipeline 4 in the soil bin and the drainage pipeline 6 in the main machine constitute the front-end slag water discharge pipeline. The tunnel boring machine drainage system also includes an emergency drainage pipeline 8 for directly discharging the accumulated water in the main machine to the outside of the tunnel. An emergency drainage pump 9 is arranged on the emergency drainage pipeline 8. The power of the emergency drainage pump 9 is greater than the power of the drainage pump 5 in the soil bin and the drainage pump 7 in the main machine. The emergency drainage pipeline 8 is not connected with the front-end slag water discharge pipeline. When the water volume is too large, the emergency drainage pipeline 8 can discharge the slag water that the front-end slag water discharge pipeline has no time to discharge. The emergency drainage pump 9 has large power and strong power, and can directly discharge the slag water to the outside of the tunnel.

[0033] The above-mentioned slag-water separation device 1, water-containing slag purification device 2, and part of the emergency drainage pipeline 8 are arranged on the rear supporting trailer, and the sewage tank inlet pipeline 3, the soil bin drainage pipeline 4, the main engine drainage pipeline 6, and the emergency drainage pump 9 are arranged in the main engine.

[0034] like Figure 1 and Figure 2 As shown, the screening unit in the slag-water separation device 1 is only composed of the pre-screening screen 1-1, so the structure of the screening unit is relatively simple and the configuration cost is low. The slag-water separation device 1 also includes a first belt conveyor 1-7. The pre-screening screen 1-1 can screen out the slag with a particle size greater than 3 mm and transport it to the first belt conveyor 1-7, and then the first belt conveyor 1-7 transfers it to the slag box of the marshaling train, and finally transports it to the outside of the tunnel by the marshaling train. The water-containing slag after the primary screening falls into the sewage tank 1-2.

[0035] As the equipment advances, water-containing slag continuously enters the sewage tank 1-2. Although it has been screened, it is still mixed with a large amount of slag. Due to the large particle size of the slag, the slag will settle in the sewage tank 1-2. In order to avoid the time-consuming and labor-intensive problem of manual dredging caused by regular shutdown, such as Figure 2 As shown, a partition 1-2-3 is provided in the sewage tank 1-2 of the present invention, and the partition 1-2-3 divides the space in the sewage tank 1-2 into a sewage chamber 1-2-1 and a clean water chamber 1-2-2. The sewage chamber 1-2-1 is used to receive the water-containing slag screened by the pre-screen 1-1. The top of the partition 1-2-3 is lower than the top of the side wall of the sewage tank 1-2 so that the water-containing slag in the sewage chamber 1-2-1 can pass over the partition to reach the clean water chamber 1-2-2. In this way, the clean water chamber 1-2-2 contains water-containing slag with a lower density, which is conducive to the discharge of the water-containing slag. The clean water chamber 1-2-2 is connected to a slurry discharge pipeline 1-5 for discharging the water-containing slag outside the tunnel, and a slurry discharge pump 1-6 is provided on the slurry discharge pipeline 1-5.

[0036] At the same time, the bottom of the sewage chamber 1-2-1 is connected to a first slurry delivery pipeline 1-3 for transporting the water-containing debris in the sewage chamber 1-2-1 to the water-containing debris purification device 2, and a first slurry delivery pump 1-4 is arranged on the first slurry delivery pipeline 1-3. The bottom of the sewage chamber 1-2-1 is a funnel structure, which is convenient for the discharge of water-containing debris. In addition, a mechanical stirring rod 1-8 is arranged in the sewage chamber 1-2-1 to avoid clogging the first slurry delivery pipeline 1-3 or the first slurry delivery pump 1-4. In addition, a first liquid level sensor 1-9 is arranged on the sewage tank 1-2, and the first liquid level sensor 1-9 is associated with the first slurry delivery pump 1-4 and the slurry discharge pump 1-6 through the control center, so as to control the first slurry delivery pump 1-4 and the slurry discharge pump 1-6 to start or increase the power when the liquid level in the sewage tank 1-2 is too high, and control the first slurry delivery pump 1-4 and the slurry discharge pump 1-6 to shut down or reduce the power when the liquid level is too low. In addition, a spare pipeline 3-1 is provided at the end of the sewage tank inlet pipeline 3, and a valve 3-2 is provided on the spare pipeline 3-1. The valve 3-2 is a normally closed valve. When the pre-selection screen 1-1 fails, the valve 3-2 can be opened to allow the slag water to directly enter the sewage chamber 1-2-1.

[0037] like Figure 1 and Figure 3 As shown, the water-containing soil purification device 2 includes a fine screening mechanism for finely screening the water-containing soil in the sewage chamber 1-2-1 and a slurry storage tank 2-3 for receiving the water-containing soil screened by the fine screening mechanism. The fine screening mechanism includes a cyclone 2-1 and a dewatering screen 2-2 arranged above the slurry storage tank 2-3. The outlet of the first slurry delivery pipeline 1-3 is connected to the inlet of the cyclone 2-1. The light material outlet (the upper right outlet in the figure) of the cyclone 2-1 is for the water-containing soil with lower density to flow directly into the slurry storage tank 2-3, and the heavy material outlet (the lower left outlet in the figure) of the cyclone 2-1 is for the water-containing soil with higher density to flow onto the dewatering screen 2-2. The water-containing slag sieved by the dewatering screen 2-2 falls into the slurry storage tank 2-3. The sieve particle size of the dewatering screen 2-2 is 0.35 mm, that is, the sieve particle size of the dewatering screen 2-2 is much smaller than the sieve particle size of the pre-selection screen 1-1, so that finer water-containing slag can enter the slurry storage tank 2-3. The water-containing slag purification device 2 also includes a second belt conveyor 2-6. The slag with a particle size greater than 0.35 mm is transported to the second belt conveyor 2-6, and then transferred to the slag box of the marshaling train by the second belt conveyor 2-6, and finally transported to the outside of the tunnel by the marshaling train.

[0038] The slurry storage tank 2-3 is connected with a second slurry delivery pipeline 2-4 for delivering the purified water-containing debris to the sewage tank 1-2. The second slurry delivery pipeline 2-4 is provided with a second slurry delivery pump 2-5, so that the purified water-containing debris can be discharged out of the cave through the sewage tank 1-2. Specifically, the outlet end of the second slurry delivery pipeline 2-4 is located directly above the water purification chamber 1-2-2, so that the purified relatively fine water-containing debris directly enters the water purification chamber 1-2-2, avoiding unnecessary circulation purification and increasing equipment energy consumption.

[0039] In addition, a second liquid level sensor 2-7 is provided on the slurry storage tank 2-7. The second liquid level sensor 2-7 is associated with the second slurry delivery pump 2-5 on the second slurry delivery pipeline 2-4 through the control center, so as to control the second slurry delivery pump 2-5 to start or increase the power when the liquid level in the slurry storage tank 2-7 is too high, and control the second slurry delivery pump 2-5 to shut down or reduce the power when the liquid level is too low, thereby improving the flexibility of slag water purification and optimizing the working environment.

[0040] In summary, the tunnel boring machine drainage system of the present invention is suitable for TBM, earth pressure shield or multi-mode TBM. It can not only discharge the accumulated water in the equipment without stopping the machine, but also prevent the water-containing slag from leaking and falling off during transportation, optimize the construction environment, and at the same time add a water-containing slag purification device, which can timely remove the sediment in the sewage tank, save manpower and material resources, and effectively improve the excavation efficiency. The tunnel boring machine drainage system of the present invention can simultaneously realize the functions of slag-water separation, silt removal, and slag discharge on the tunnel boring machine, ensuring that the tunnel boring machine can excavate smoothly and efficiently in water-rich strata, reducing construction costs.

[0041] Embodiment 2 of the drainage system of a tunnel boring machine in the present invention: Figure 4 As shown, what is different from Example 1 is that the drainage pump 7-1 in the main engine is also a diaphragm pump, which is the same as the drainage pump 5 in the soil bin.

[0042] Embodiment 3 of the drainage system of a tunnel boring machine in the present invention: Figure 5 As shown, the difference from Example 2 is that one of the drainage pumps 5-1 in the soil bin is a submersible pump.

[0043] Embodiment 4 of the drainage system of a tunnel boring machine in the present invention: Figure 6 As shown, the difference from Example 2 is that one of the drainage pumps 5-2 in the soil bin is a spiral slurry pump.

[0044] In other embodiments of the tunnel boring machine drainage system: the fine screening mechanism may only include a dewatering screen, in which case the water-containing slag is no longer subjected to cyclone separation. Of course, the screening particle size of the dewatering screen must be smaller than the screening particle size of the pre-selection screen.

[0045] In other embodiments of the tunnel boring machine drainage system: liquid level sensors may no longer be provided on the slurry storage tank and the sewage tank, and the liquid level can be manually observed to control the opening and closing or power of the corresponding pump.

[0046] In other embodiments of the drainage system of the tunnel boring machine: three, four or more drainage pipelines may be provided in the soil bin, or of course only one drainage pipeline may be provided.

[0047] In other embodiments of the tunnel boring machine drainage system: emergency drainage pipelines may no longer be provided, and drainage may be performed only by drainage pipelines in the soil bin and drainage pipelines in the main machine. Of course, only drainage pipelines in the soil bin or only drainage pipelines in the main machine may also be provided.

[0048] In other embodiments of the tunnel boring machine drainage system: the screening unit can also be a two-stage screening unit, including a primary screen and a secondary screen, the water-containing debris screened out by the primary screen enters the secondary screen, and the water-containing debris screened out by the secondary screen enters the sewage tank.

[0049] In other embodiments of the tunnel boring machine drainage system: the outlet end of the second slurry delivery pipeline can be located in the clean water chamber, and of course can also be located in the sewage chamber or directly above the sewage chamber.

[0050] In other embodiments of the tunnel boring machine drainage system: no partition may be provided in the sewage tank. In this case, there is only one chamber in the sewage tank. The water-containing debris purified in the slurry storage tank is transported to the sewage tank through the second slurry pipeline. The outlet end of the second slurry pipeline is located directly above the sewage tank.

[0051] An embodiment of a tunnel boring machine in the present invention is as follows: the tunnel boring machine includes a main machine, a rear supporting trailer and a drainage system, wherein the specific structure of the drainage system is the same as the drainage system of the tunnel boring machine in any of the above embodiments, and will not be repeated here.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A tunnel boring machine drainage system, comprising a screening unit for screening water-containing debris generated during tunnel boring machine construction and a sewage tank for receiving the water-containing debris screened by the screening unit, characterized in that: The tunnel boring machine drainage system also includes a fine screening mechanism for finely screening the water-containing debris in the sewage tank and a slurry storage tank for receiving the water-containing debris screened by the fine screening mechanism. The screening particle size of the fine screening mechanism is smaller than the screening particle size of the screening unit. The bottom of the sewage tank is connected to a first slurry pipeline for transporting the water-containing debris in the sewage tank to the fine screening mechanism. The slurry storage tank is connected to a second slurry pipeline for transporting the purified water-containing debris to the sewage tank. Slurry pumps are respectively provided on the first slurry pipeline and the second slurry pipeline.

2. The tunnel boring machine drainage system according to claim 1, characterized in that: A partition is provided in the sewage tank, which divides the space in the sewage tank into a sewage chamber and a clean water chamber. The sewage chamber is used to receive the water-containing debris after screening by the screening unit. The first slurry pipeline is connected to the bottom of the sewage chamber. The top of the partition is lower than the top of the side wall of the sewage tank so that the water-containing debris in the sewage chamber can pass over the partition and reach the clean water chamber. The clean water chamber is connected to a slurry discharge pipeline for discharging the water-containing debris to the outside of the tunnel, and a slurry discharge pump is provided on the slurry discharge pipeline.

3. The tunnel boring machine drainage system according to claim 2, characterized in that: The outlet end of the second slurry conveying pipeline is located in the clean water chamber or directly above the clean water chamber.

4. The tunnel boring machine drainage system according to any one of claims 1 to 3, characterized in that: The screening unit consists only of a pre-screen.

5. The tunnel boring machine drainage system according to any one of claims 1 to 3, characterized in that: The tunnel boring machine drainage system also includes an internal soil bin drainage pipeline for discharging water accumulated in the soil bin and an internal main machine drainage pipeline for discharging water accumulated in the main machine. The internal soil bin drainage pipeline is provided with an internal soil bin drainage pump, and the internal main machine drainage pipeline is provided with an internal main machine drainage pump. The internal soil bin drainage pipeline and the internal main machine drainage pipeline merge into a sewage tank inlet pipeline, and the outlet end of the sewage tank inlet pipeline is connected to the inlet end of the screening unit.

6. The tunnel boring machine drainage system according to claim 5, characterized in that: The tunnel boring machine drainage system also includes an emergency drainage pipeline for directly discharging the accumulated water in the main machine to the outside of the tunnel. An emergency drainage pump is arranged on the emergency drainage pipeline. The power of the emergency drainage pump is greater than the power of the drainage pump in the soil bin and the drainage pump in the main machine.

7. The tunnel boring machine drainage system according to claim 5, characterized in that: At least two drainage pipes are arranged in the soil bin, and the inlet end of each drainage pipe in the soil bin is used to be respectively connected to different slurry discharge holes arranged above and below the soil bin partition, and the inlet end of each drainage pipe in the soil bin is provided with a filter.

8. The tunnel boring machine drainage system according to any one of claims 1 to 3, characterized in that: A liquid level sensor is provided on the slurry storage tank. The liquid level sensor is used to connect with the slurry pump on the second slurry pipeline through the control center, so as to control the slurry pump on the second slurry pipeline to start or increase the power when the liquid level in the slurry storage tank is too high, and to control the slurry pump on the second slurry pipeline to shut down or reduce the power when the liquid level is too low.

9. The tunnel boring machine drainage system according to any one of claims 1 to 3, characterized in that: The fine screening mechanism includes a cyclone and a dewatering screen arranged above the slurry storage tank. The outlet of the first slurry delivery pipeline is connected to the inlet of the cyclone. The light material outlet of the cyclone allows the water-containing soil with lower density to flow directly into the slurry storage tank, and the heavy material outlet of the cyclone allows the water-containing soil with higher density to flow onto the dewatering screen. The dewatering screen allows the screened water-containing soil to fall into the slurry storage tank.

10. A tunnel boring machine, comprising a main machine, a rear supporting trailer and a drainage system, characterized in that: The drainage system is the tunnel boring machine drainage system as described in any one of claims 1 to 9.

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