An emergency cleaning system for dual-liquid grouting pipelines in ultra-large diameter tunnel boring machines.

Abstract

The present invention provides an emergency cleaning system for a dual-liquid grouting pipeline of an ultra-large diameter tunnel boring machine, comprising a mixer connected to a grouting pipeline at the outlet, a first grout pipeline, a second grout pipeline, a first three-way valve, a second three-way valve, a conventional cleaning water tank, an emergency cleaning water tank, and an accumulator. The emergency cleaning water tank is connected at its top to a pressure-maintaining system, with its bottom connected to the cleaning pipeline. A first control valve is installed on the pressure-maintaining pipeline, and a second control valve is installed on the emergency pipeline, both of which are normally open. In the event of a power outage, the first and second control valves automatically open, and the pressure-maintaining system injects high-pressure gas into the emergency cleaning water tank, forcing the water inside to flow into the cleaning pipeline through the emergency pipeline and maintain a certain pressure. Simultaneously, the accumulator controls the first and second three-way valves to connect, allowing pressurized water in the cleaning pipeline to be injected into the mixer along the first and second grout pipelines and finally discharged from the grouting pipeline, thus automatically achieving emergency cleaning.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine technology, and in particular to an emergency cleaning system for dual-liquid grouting pipelines of ultra-large diameter tunnel boring machines. Background Technology

[0002] During tunnel boring machine (TBM) excavation, grouting is required to fill the gaps between the assembled tunnel segments and the tunnel wall to enhance stability. To improve grouting efficiency, most existing grouting systems employ a dual-liquid grouting method, where two types of grout are mixed to achieve rapid solidification. In actual use, to avoid pipe blockage, the pipelines transporting the first and second types of grout within the TBM are independent. However, before grouting, a mixer is used to mix them before outputting them through the grouting pipeline. After use, clean water needs to be pumped in to flush the mixer and grouting pipeline promptly to prevent blockage. However, when the tunnel boring machine (TBM) triggers its power outage protection, the water pump cannot start due to the power failure. The grouting solution will stagnate, solidify, or even block the mixer and grouting pipeline. The existing solution to this problem is to manually clean the mixer and grouting pipeline by disassembling them. For small-diameter TBMs, the mixer is relatively small and the grouting pipeline is relatively short, so this method is barely applicable. However, for large-diameter or ultra-large-diameter TBMs, the mixer is large and the grouting pipeline is long and thick. Disassembly and assembly are inconvenient, time-consuming, and labor-intensive. Using disassembly and cleaning would seriously reduce construction efficiency. Summary of the Invention

[0003] The purpose of this invention is to overcome one or more shortcomings in the prior art and provide an emergency cleaning system for dual-liquid grouting pipelines of ultra-large diameter tunnel boring machines.

[0004] To achieve the above objectives, the technical solution provided by this invention is an emergency cleaning system for the dual-liquid grouting pipeline of an ultra-large diameter tunnel boring machine, comprising:

[0005] A mixer having a first inlet, a second inlet, and an outlet, wherein a grouting pipe is connected to the outlet;

[0006] A first slurry tank is connected to the first inlet via a first slurry pipe, and a first slurry pump is installed on the first slurry pipe.

[0007] The second slurry tank is connected to the second inlet via a second slurry pipe, and a second slurry pump is installed on the second slurry pipe;

[0008] The three-way valve includes a first three-way valve disposed on the first slurry pipeline and located between the first slurry pump and the first inlet, and a second three-way valve disposed on the second slurry pipeline and located between the second slurry pump and the second inlet;

[0009] A conventional cleaning water tank is connected to the first three-way valve and the second three-way valve via a cleaning pipe, and a cleaning water pump is installed on the cleaning pipe.

[0010] The emergency cleaning system also includes an emergency cleaning water tank. The top of the emergency cleaning water tank is connected to the pressure holding system via a pressure holding pipe. A first control valve is installed on the pressure holding pipe. The bottom of the emergency cleaning water tank is connected to the cleaning pipe via an emergency pipe. The connection point is located between the cleaning water pump and the first three-way valve and the second three-way valve. A second control valve is installed on the emergency pipe. The first control valve and the second control valve are normally open valves.

[0011] The emergency cleaning system also includes an accumulator that controls the opening and closing of the first three-way valve and the second three-way valve. When the power is off, the accumulator controls the first three-way valve to connect the cleaning pipe and the first slurry pipe, and controls the second three-way valve to connect the cleaning pipe and the second slurry pipe, so that the water in the cleaning pipe can be injected into the mixer along the first slurry pipe and the second slurry pipe, and finally discharged from the grouting pipe to achieve emergency cleaning.

[0012] Preferably, the top of the emergency cleaning water tank is also connected to the water supply pipe via a water replenishment pipe, a third control valve is provided on the water replenishment pipe, and a fourth control valve for pressure relief is connected to the side wall of the emergency cleaning water tank, the fourth control valve being located near the top of the emergency cleaning water tank.

[0013] Preferably, the side wall of the emergency cleaning water tank is also connected to a liquid level pipe.

[0014] Preferably, a drain pipe is connected to the side of the grouting pipe, and the drain pipe is connected to the sewage tank.

[0015] More preferably, the bypass point of the sewage pipe is located near the outlet of the grouting pipe.

[0016] Preferably, the pressure-holding pipeline is further provided with a first check valve, which is located between the first control valve and the pressure-holding system.

[0017] Preferably, the emergency pipeline is further provided with a second check valve, which is located on the side of the second control valve away from the emergency water tank.

[0018] Preferably, the cleaning pipeline is further provided with a third check valve, which is located between the cleaning water pump and the bypass point of the emergency cleaning pipeline.

[0019] Preferably, the cleaning pipeline is further provided with a fourth control valve, which is located between the cleaning water pump and the conventional cleaning water tank.

[0020] Preferably, the pressure of the high-pressure gas provided by the pressure-holding system is 6-8 bar.

[0021] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0022] In the event of a power outage, the first and second control valves automatically open, and the pressure-holding system injects high-pressure gas into the emergency cleaning water tank, forcing the water in the emergency cleaning water tank to flow into the cleaning pipeline through the emergency pipeline and maintain a certain pressure. At the same time, the accumulator controls the first and second three-way valves to open, allowing the pressurized water in the cleaning pipeline to be injected into the mixer along the first and second slurry pipelines, and finally discharged from the grouting pipeline, thus automatically realizing emergency cleaning. Attached Figure Description

[0023] Figure 1 This is a simplified schematic diagram of a preferred embodiment of the present invention.

[0024] Figure 2 yes Figure 1 Front view schematic diagram of the emergency cleaning water tank.

[0025] Figure 3 yes Figure 2 A left-side view diagram.

[0026] Figure 4 yes Figure 2 A top-down view.

[0027] Figure 5 , Figure 6 , Figure 7 , Figure 8 This is a schematic diagram of a preferred embodiment of the present invention.

[0028] The components are as follows: 10. Mixer; 11. First inlet; 12. Second inlet; 13. Outlet; 14. Grouting pipe; 15. Sewage pipe; 16. Sewage tank; 20. First slurry tank; 21. First slurry pipe; 22. First slurry pump; 30. Second slurry tank; 31. Second slurry pipe; 32. Second slurry pump; 41. First three-way valve; 42. Second three-way valve; 50. Conventional cleaning water tank; 51. Cleaning pipe; 511. Third check valve; 52. Cleaning water pump; 60. Emergency cleaning water tank; 61. Pressure holding pipe; 611. First check valve; 62. Pressure holding system; 63. First control valve; 64. Emergency pipe; 641. Second check valve; 65. Second control valve; 66. Water supply pipe; 67. Third control valve; 68. Fourth control valve; 69. Liquid level pipe; 70. Accumulator. Detailed Implementation

[0029] like Figures 1 to 8 As shown, the emergency cleaning system for dual-liquid grouting pipelines of ultra-large diameter tunnel boring machines provided by the present invention includes: a mixer 10, a first grout tank 20, a second grout tank 30, a three-way valve, a conventional cleaning water tank 50, an emergency cleaning water tank 60, and an accumulator 70. The mixer 10 has a first inlet 11, a second inlet 12, and an outlet 13, with a grouting pipe 14 connected to the outlet 13. The first grout tank 20 is connected to the first inlet 11 via a first grout pipe 21. The system includes a first slurry pump 22; a second slurry tank 30 connected to a second inlet 12 via a second slurry pipe 31, on which the second slurry pump 32 is mounted; a three-way valve includes a first three-way valve 41 located on the first slurry pipe 21 between the first slurry pump 22 and the first inlet 11, and a second three-way valve 42 located on the second slurry pipe 31 between the second slurry pump 32 and the second inlet 12; and a conventional cleaning water tank 50 connected to the first three-way valve via a cleaning pipe 51. Valve 41 and the second three-way valve 42 are connected. A cleaning water pump 52 is installed on the cleaning pipeline 51. The top of the emergency cleaning water tank 60 is connected to the pressure holding system 62 through a pressure holding pipeline 61. A first control valve 63 is installed on the pressure holding pipeline 61. The bottom of the emergency cleaning water tank 60 is connected to the cleaning pipeline 51 through an emergency pipeline 64. The connection point is located between the cleaning water pump 52 and the first three-way valve 41 and the second three-way valve 42. A second control valve 65 is installed on the emergency pipeline 64. The first control valve 63 is connected to the first control valve 64. 3. The second control valve 65 is a normally open valve; the accumulator 70 is used to control the opening and closing of the first three-way valve 41 and the second three-way valve 42. When the power is off, the accumulator 70 controls the first three-way valve 41 to connect the cleaning pipe 51 and the first slurry pipe 21, and controls the second three-way valve 42 to connect the cleaning pipe 51 and the second slurry pipe 31, so that the water in the cleaning pipe 51 can be injected into the mixer 10 along the first slurry pipe 21 and the second slurry pipe 31, and finally discharged from the grouting pipe 14 to achieve emergency cleaning.

[0030] The advantage of this setup is that, in the event of a power outage, the first and second control valves can automatically open, allowing the pressure-holding system to inject high-pressure gas into the emergency cleaning water tank. This forces the water in the emergency cleaning water tank to flow into the cleaning pipeline through the emergency pipeline and maintain a certain pressure. At the same time, the accumulator controls the first and second three-way valves to open, allowing the pressurized water in the cleaning pipeline to be injected into the mixer along the first and second slurry pipelines and finally discharged from the grouting pipeline, thus automatically achieving emergency cleaning.

[0031] In this embodiment, the top of the emergency cleaning water tank 60 is also connected to the water supply pipe via a water replenishment pipe 66. A third control valve 67 is provided on the water replenishment pipe 66. A fourth control valve 68 for pressure relief is connected to the side wall of the emergency cleaning water tank 60. The fourth control valve 68 is located near the top of the emergency cleaning water tank 60.

[0032] The advantage of this setup is that when power is restored, the first and second control valves automatically close, allowing water to be replenished by opening the third and fourth control valves.

[0033] In another embodiment, the third control valve 67 and the fourth control valve 68 are normally closed valves so that water can be automatically replenished when power is restored.

[0034] In this embodiment, a drain pipe 15 is connected to the grouting pipe 14 and is connected to the sewage tank 16 through the drain pipe 15. During emergency cleaning, the sewage passing through the mixer 10 and the grouting pipe 14 can enter the sewage tank 16. To prevent the sewage tank 16 from overflowing, a liquid level pipe 69 is further connected to the side wall of the emergency cleaning water tank 60 to monitor the amount of sewage flowing into the sewage tank 16. At the same time, the capacity of the emergency cleaning water tank 60 is set with reference to the capacity of the sewage tank 16 and is slightly larger than that of the sewage tank 16.

[0035] Meanwhile, in order to minimize the length of the grouting pipe 14 that has not been cleaned at the outlet end, the bypass point of the sewage pipe 15 is further located close to the outlet of the grouting pipe 14. When the sewage tank 16 is full, the excess water in the emergency cleaning water tank 60 can continue to flush the outlet end of the grouting pipe 14 to ensure its smooth flow.

[0036] To prevent backflow, in this embodiment, a first check valve 611 is also provided on the pressure-holding pipeline 61. The first check valve 611 is located between the first control valve 63 and the pressure-holding system 62. A second check valve 641 is also provided on the emergency pipeline 64. The second check valve 641 is located on the side of the second control valve 65 away from the emergency cleaning water tank 60. A third check valve 511 is also provided on the cleaning pipeline 51. The third check valve 511 is located between the cleaning water pump 52 and the bypass point of the emergency pipeline 64.

[0037] Meanwhile, for ease of control, a fourth control valve 53 is also provided on the cleaning pipe 51, which is located between the cleaning water pump 51 and the conventional cleaning water tank 50.

[0038] To ensure the effectiveness of automatic emergency cleaning, in this embodiment, the pressure of the high-pressure gas provided by the pressure holding system 62 is 6-8 bar.

[0039] It should be noted that in the above embodiments, manual control valves, pressure gauges or temperature gauges can be added to each pipeline according to actual needs, which will not be described in detail here.

[0040] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An emergency cleaning system for dual-liquid grouting pipelines of ultra-large diameter tunnel boring machines, comprising: A mixer having a first inlet, a second inlet, and an outlet, wherein a grouting pipe is connected to the outlet; A first slurry tank is connected to the first inlet via a first slurry pipe, and a first slurry pump is installed on the first slurry pipe. The second slurry tank is connected to the second inlet via a second slurry pipe, and a second slurry pump is installed on the second slurry pipe; The three-way valve includes a first three-way valve disposed on the first slurry pipeline and located between the first slurry pump and the first inlet, and a second three-way valve disposed on the second slurry pipeline and located between the second slurry pump and the second inlet; A conventional cleaning water tank is connected to the first three-way valve and the second three-way valve via a cleaning pipe, and a cleaning water pump is installed on the cleaning pipe. Its features are: The emergency cleaning system also includes an emergency cleaning water tank. The top of the emergency cleaning water tank is connected to the pressure holding system via a pressure holding pipe. A first control valve is installed on the pressure holding pipe. The bottom of the emergency cleaning water tank is connected to the cleaning pipe via an emergency pipe. The connection point is located between the cleaning water pump and the first three-way valve and the second three-way valve. A second control valve is installed on the emergency pipe. The first control valve and the second control valve are normally open valves. The emergency cleaning system also includes an accumulator that controls the opening and closing of the first three-way valve and the second three-way valve. When the power is off, the accumulator controls the first three-way valve to connect the cleaning pipe and the first slurry pipe, and controls the second three-way valve to connect the cleaning pipe and the second slurry pipe, so that the water in the cleaning pipe can be injected into the mixer along the first slurry pipe and the second slurry pipe, and finally discharged from the grouting pipe to achieve emergency cleaning.

2. The emergency cleaning system according to claim 1, characterized in that: The top of the emergency cleaning water tank is also connected to the water supply pipe via a water replenishment pipe. A third control valve is installed on the water replenishment pipe. A fourth control valve for pressure relief is connected to the side wall of the emergency cleaning water tank. The fourth control valve is located near the top of the emergency cleaning water tank.

3. The emergency cleaning system according to claim 1, characterized in that: The side wall of the emergency cleaning water tank is also connected to a liquid level pipe.

4. The emergency cleaning system according to claim 1, characterized in that: A sewage pipe is connected to the side of the grouting pipe, and the sewage pipe is connected to the sewage tank.

5. The emergency cleaning system according to claim 4, characterized in that: The bypass point of the sewage pipe is located near the outlet of the grouting pipe.

6. The emergency cleaning system according to claim 1, characterized in that: The pressure-holding pipeline is also equipped with a first check valve, which is located between the first control valve and the pressure-holding system.

7. The emergency cleaning system according to claim 1, characterized in that: The emergency pipeline is also equipped with a second check valve, which is located on the side of the second control valve away from the emergency cleaning water tank.

8. The emergency cleaning system according to claim 1, characterized in that: The cleaning pipeline is also equipped with a third check valve, which is located between the cleaning water pump and the bypass point of the emergency cleaning pipeline.

9. The emergency cleaning system according to claim 1, characterized in that: The cleaning pipeline is also equipped with a fourth control valve, which is located between the cleaning water pump and the conventional cleaning water tank.

10. The emergency cleaning system according to claim 1, characterized in that: The pressure-holding system provides high-pressure gas at a pressure of 6-8 bar.

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