A shield machine synchronous double slurry injection pipeline system, use method and cleaning method

Abstract

The present invention is a shield machine synchronous double-liquid slurry pipeline system, a use method and a cleaning method, which belongs to the field of urban underground engineering construction. It includes a liquid pump A, a liquid pump B and a mixing mechanism, the liquid pump A and the liquid pump B are both connected to the mixing mechanism, the discharge port of the mixing mechanism is used to extrude the mixed double-liquid slurry, the mixing mechanism includes a main pipeline, a first pipeline and a second pipeline, one end of the first pipeline is connected to the liquid pump A, the other end of the first pipeline is connected to the main pipeline, one end of the second pipeline is connected to the liquid pump B, the other end of the second pipeline is connected to the main pipeline, and one end of the main pipeline is provided with a piston push rod, the piston push rod is sleeved in the main pipeline for blocking one end of the main pipeline, and can block the connection between the first pipeline and the second pipeline and the main pipeline. Through the provided piston push rod, the piston push rod can be pushed to discharge the residual slurry in the main pipeline after the grouting is completed, which is not easy to cause pipeline blockage, and avoids the time and effort caused by manual cleaning after blockage.

Description

Technical Field

[0001] The invention relates to the technical field of urban underground engineering construction, and in particular to a shield machine synchronous double-slurry injection pipeline system, a use method and a cleaning method. Background Art

[0002] With the rapid development of shield machine manufacturing technology, more and more shield construction projects such as railways, highways, municipal engineering, and pipeline corridors are being constructed. However, the traditional shield synchronous single-liquid grouting technology has not been effectively improved due to a series of problems such as long mortar consolidation time, easy dilution under water-rich strata, volume shrinkage after consolidation leading to segment floating, surface settlement, and tunnel leakage. In particular, the single-liquid grouting method is not enough to meet the construction requirements for engineering projects with high settlement requirements and complex surface environment. Therefore, the application of double-liquid slurry with high early strength, short setting time, and good filling property can effectively control the floating of the segment, control the quality of the formed tunnel segment, and improve the forming effect of the tunnel. At the same time, it can improve the settlement control accuracy of the surface and surrounding structures, which has significant social and economic benefits. However, due to the relatively complex proportion and grouting process of double-liquid grouting, it is easy to cause pipeline blockage, which has to be dredged, increasing personnel costs and directly affecting the construction progress. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a shield machine synchronous dual-slurry injection pipeline system, a use method and a cleaning method whose pipelines are not easily clogged, thereby solving the problem in the prior art that pipelines are easily clogged, resulting in time-consuming and labor-intensive manual cleaning.

[0004] The technical solution adopted by the present invention is as follows:

[0005] First,

[0006] A shield construction synchronous double-liquid slurry pipeline system includes an A liquid pump, a B liquid pump and a mixing mechanism, wherein the A liquid pump and the B liquid pump are both connected to the mixing mechanism, and the discharge port of the mixing mechanism is used to extrude the mixed double-liquid slurry, and the mixing mechanism includes a main pipeline, a first pipeline, and a second pipeline, wherein one end of the first pipeline is connected to the A liquid pump, and the other end of the first pipeline is connected to the main pipeline, one end of the second pipeline is connected to the B liquid pump, and the other end of the second pipeline is connected to the main pipeline, and a piston push rod is provided at one end of the main pipeline, and the piston push rod is sleeved in the main pipeline to block one end of the main pipeline, and can block the connection between the first pipeline, the second pipeline and the main pipeline. Through the provided piston push rod, the piston push rod can be pushed to discharge the residual slurry in the main pipeline after the grouting is completed, which is not easy to cause pipeline blockage, and avoids the time-consuming and labor-intensive manual cleaning after blockage.

[0007] Preferably, the other end of the second pipe is connected to the middle section of the first pipe, and a rubber nozzle is also provided in the second pipe, and the rubber nozzle is used to block the connection between the second pipe and the first pipe.

[0008] Preferably, the mixing mechanism also includes a third pipe, one end of the third pipe is used to connect cleaning water, and the other end is connected to the main pipe, and the distance between the connection point between the third pipe and the main pipe and the discharge port is greater than the distance between the connection point between the first pipe and the main pipe and the discharge port.

[0009] Preferably, a gate valve, a second valve and a first valve are sequentially arranged between the A liquid pump and the first pipeline, the gate valve is arranged between the A liquid tank and the A liquid pump, the second valve and the first valve are arranged between the A liquid pump and the first pipeline, and a fourth valve is arranged between the B liquid pump and the second pipeline.

[0010] Preferably, the pipeline system is also provided with a flushing station, which is connected to the second pipeline, and a flushing water pump is arranged between the flushing station and the second pipeline. A fifth valve is also arranged between the flushing water pump and the second pipeline. The flushing station is also connected to the third pipeline through a fourth pipeline, one end of the fourth pipeline is connected between the fifth valve and the flushing water pump, and the other end of the fourth pipeline is connected to the third pipeline. A sixth valve is arranged on the fourth pipeline, and a fifth pipeline is also arranged. One end of the fifth pipeline is connected to the fourth pipeline between the sixth valve and the third pipeline, and the other end of the fifth pipeline is connected to the second pipeline.

[0011] Preferably, the pipeline system further includes a sewage tank and a liquid return pipeline, one end of the liquid return pipeline is connected between the second valve and the first valve, the other end of the liquid return pipeline is connected to the sewage tank, and a third valve is arranged on the liquid return pipeline.

[0012] In a second aspect, a method for synchronously injecting dual-liquid slurry during shield construction adopts the system mentioned in the first aspect, comprising the following steps:

[0013] S1. Adjust the piston push rod to the closed state, and the rubber nozzle is in the contracted closed state;

[0014] S2, start the liquid B pump and pressurize it to a value suitable for grouting;

[0015] S3. When the tunnel boring machine advances 10-20 cm and the advancement speed is stable, pull the piston push rod to open it, start the A liquid pump, and inject A liquid into the main pipeline through the first pipeline;

[0016] Grouting starts after each ring has been advanced 10-20cm. A certain gap can be left to prevent the double liquid slurry from squeezing to the outside of the shield.

[0017] S4. After 15 seconds of injection of liquid A, pull the rubber nozzle to open it. Liquid B output by the liquid B pump expands the rubber nozzle and starts to inject liquid B water glass. Liquid B enters the first pipeline through the second pipeline and mixes with liquid A. Liquid A and liquid B are mixed in the mixing mechanism to form a uniform gelling material. The dual-liquid slurry is injected while the shield machine is advancing.

[0018] S5. Start each synchronous dual-liquid slurry injection point in sequence according to the set order, and observe the grouting pressure and volume;

[0019] S6. When the shield machine has completed the first 10-20cm of excavation, turn off the B liquid pump and stop the B liquid grouting;

[0020] S7. When the shield machine has completed the first 3-5cm of excavation, push the piston push rod to close the first pipeline, stop the grouting of liquid A, continue to push the piston push rod, use the piston push rod to push the cementitious material in the pipe out of the discharge port, and close the discharge port of the main pipeline.

[0021] In a third aspect, a method for cleaning a synchronous dual-liquid slurry injection system for shield construction adopts the system mentioned in the first aspect, comprising the following steps:

[0022] Step 1: When the shield machine reaches the end of the excavation process, stop the B liquid pump and enter the B liquid positive flushing mode;

[0023] Step 2, sequentially close the B liquid pump, close the fourth valve and the sixth valve, open the fifth valve, start the flushing water pump to flush the pipeline, and the flushing water is discharged through the grouting port;

[0024] Step 3: Turn off the flushing water pump, shrink and close the rubber nozzle, and then delay the grouting of liquid A for 30-60 seconds;

[0025] Step 4: Close the A liquid pump, close the second valve, the first valve, and the gate valve, close the fifth valve, open the third valve, the sixth valve, and the first valve, extend the piston push rod to close the grouting port, and complete the flushing of the B liquid pipeline.

[0026] Preferably, the method further comprises the following steps:

[0027] Step 5, close the fifth valve, open the third valve, the sixth valve, and the first valve, and extend the piston push rod to close the grouting port;

[0028] Step 6: Start the flushing water pump to flush the pipeline, and the flushing water enters the sewage tank through the pipeline;

[0029] Step 7: After flushing is completed, close the third valve, the sixth valve, and the first valve to complete the backwashing of liquid A.

[0030] It can be seen from the above technical solutions that the advantages of the present invention are: through the piston push rod, the piston push rod can be pushed to discharge the residual slurry in the main pipeline after the grouting is completed, which is not easy to cause pipeline blockage and avoids the time-consuming and labor-intensive manual cleaning after blockage. Through the third pipeline, the third pipeline can be filled with water to clean the residual slurry in the main pipeline, further avoiding pipeline blockage. Grouting starts after each ring starts to advance 10-20cm, and pushing out a certain gap can prevent the double liquid slurry from squeezing to the outside of the shield. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a structural schematic diagram of the mixing mechanism and the shield tail according to a specific embodiment of the present invention.

[0033] Figure 2 This is a schematic diagram for cleaning the B liquid pipeline.

[0034] Figure 3 This is a schematic diagram for cleaning the A liquid pipeline.

[0035] In the figure: 1. A liquid tank; 2. B liquid tank; 3. mixing mechanism; 31. main pipeline; 32. first pipeline; 33. second pipeline; 34. third pipeline; 35. piston push rod; 36. rubber nozzle; 37. discharge port; 4. A liquid cement slurry pipeline; 5. A liquid pump; 6. B liquid water glass pipeline; 7. B liquid pump; 8. flushing water pump; 9. shield tail; 10. gate valve; 11. flushing station; 12. first valve; 13. second valve; 14. third valve; 15. fourth valve; 16. fifth valve; 17. sixth valve; 18. sewage tank; 19. fourth pipeline; 20. fifth pipeline. DETAILED DESCRIPTION

[0036] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0037] Embodiment 1:

[0038] like Figure 1-Figure 3As shown, a shield construction synchronous dual-liquid slurry pipeline system includes an A liquid pump 5, a B liquid pump 7 and a mixing mechanism 3. The A liquid pump 5 and the B liquid pump 7 are both connected to the mixing mechanism 3. The discharge port 37 of the mixing mechanism 3 is used to extrude the mixed dual-liquid slurry. The mixing mechanism 3 includes a main pipeline 31, a first pipeline 32 and a second pipeline 33. One end of the first pipeline 32 is connected to the A liquid pump 5, and the other end of the first pipeline 32 is connected to the main pipeline 31. One end of the second pipeline 33 is connected to the B liquid pump 7, and the other end of the second pipeline 33 is connected to the main pipeline 31. A piston push rod 35 is provided at one end of the main pipeline 31. The piston push rod 35 is sleeved in the main pipeline 31 to block one end of the main pipeline 31 and can block the connection between the first pipeline 32, the second pipeline 33 and the main pipeline 31. In this way, through the provided piston push rod 35, the piston push rod 35 can be pushed to discharge the residual slurry in the main pipeline 31 after grouting is completed, which is not easy to cause pipeline blockage, and avoids the time and effort caused by manual cleaning after blockage.

[0039] In this embodiment, the other end of the second pipe 33 is connected to the middle section of the first pipe 32 , and a rubber nozzle 36 is further provided in the second pipe 33 , and the rubber nozzle 36 is used to block the connection between the second pipe 33 and the first pipe 32 .

[0040] In this embodiment, the mixing mechanism 3 also includes a third pipe 34, one end of the third pipe 34 is used to connect cleaning water, and the other end is connected to the main pipe 31, and the distance between the connection point between the third pipe 34 and the main pipe 31 and the discharge port 37 is greater than the distance between the connection point between the first pipe 32 and the main pipe 31 and the discharge port 37.

[0041] In this embodiment, a gate valve 10, a second valve 13 and a first valve 12 are sequentially arranged on the A liquid cement slurry pipeline 4 between the A liquid pump 5 and the first pipeline 32, the gate valve 10 is arranged between the A liquid tank 1 and the A liquid pump 5, the second valve 13 and the first valve 12 are arranged between the A liquid pump 5 and the first pipeline 32, and a fourth valve 15 is arranged on the B liquid water glass pipeline 6 between the B liquid pump 7 and the second pipeline 33.

[0042] In this embodiment, the pipeline system is also provided with a flushing station 11, which is connected to the second pipeline 33. The flushing water pump 8 is arranged between the flushing station 11 and the second pipeline 33. A fifth valve 16 is also arranged between the flushing water pump 8 and the second pipeline 33. The flushing station 11 is also connected to the third pipeline 34 through a fourth pipeline. One end of the fourth pipeline is connected between the fifth valve 16 and the flushing water pump 8, and the other end of the fourth pipeline is connected to the third pipeline 34. A sixth valve 17 is arranged on the fourth pipeline. A fifth pipeline is also arranged. One end of the fifth pipeline is connected to the fourth pipeline between the sixth valve 17 and the third pipeline 34, and the other end of the fifth pipeline is connected to the second pipeline 33.

[0043] In this embodiment, the pipeline system also includes a sewage tank 18 and a liquid return pipe, one end of the liquid return pipe is connected between the second valve 13 and the first valve 12, and the other end of the liquid return pipe is connected to the sewage tank 18. A third valve 14 is provided on the liquid return pipe.

[0044] Embodiment 2:

[0045] like Figure 1-Figure 3 As shown, a method for synchronously injecting dual-liquid slurry in shield construction, using the system mentioned in Example 1, includes the following steps:

[0046] S1, adjust the piston push rod 35 to the closed state, and the rubber nozzle 36 is in the retracted closed state;

[0047] S2, start the liquid B pump 7 and pressurize it to a value suitable for grouting;

[0048] S3. When the tunnel boring machine advances 10-20 cm and the advancing speed is stable, the piston push rod 35 is pulled to open, the A liquid pump 5 is started, and the A liquid is injected into the main pipeline 31 through the first pipeline 32;

[0049] Grouting starts after each ring has been advanced 10-20cm. A certain gap can be left to prevent the double liquid slurry from squeezing to the outside of the shield.

[0050] S4, 15 seconds after the injection of liquid A, pull the rubber nozzle 36 to open it, and the liquid B output by the liquid B pump 7 expands the rubber nozzle 36, and the liquid B water glass injection begins. The liquid B enters the first pipeline 32 through the second pipeline 33 and mixes with the liquid A. The liquid A and the liquid B are mixed in the mixing mechanism 3 to form a uniform gelling material, and the dual-liquid slurry is injected while the shield machine is advancing;

[0051] S5. Start each synchronous dual-liquid slurry injection point in sequence according to the set order, and observe the grouting pressure and volume;

[0052] S6. When the shield machine has completed the excavation of the first 10-20 cm, turn off the B liquid pump 7 and stop the B liquid grouting;

[0053] S7. When the shield machine has completed the first 3-5 cm of excavation, the piston push rod 35 is pushed to close the first pipeline 32, the A liquid grouting is stopped, and the piston push rod 35 is continued to be pushed to push the cementitious material in the pipe out of the discharge port 37 with the piston push rod 35, and the discharge port 37 of the main pipeline 31 is closed.

[0054] Among them, the A liquid cement slurry is the cement slurry prepared by the ground mixing station, pumped into the transport tank truck through the reserved pipeline, and then transported to the transfer pump at the tail of the shield machine by the transport tank truck, and pumped to the A liquid tank 1 in the grouting area of ​​the shield machine by the transfer pump for storage; the B liquid water glass is stored in a PE barrel, pumped to the underground segment vehicle by a variable frequency stainless steel screw pump, and transported to the shield machine by the special water glass transport tank on the segment vehicle, and then transported to the B liquid tank 2 of the shield machine by a pneumatic diaphragm pump for storage.

[0055] Before each ring is pushed forward, the injection of liquid A and liquid B is stopped in advance to prevent the double liquid slurry from solidifying at the shield tail 9 after shutdown.

[0056] Embodiment three:

[0057] like Figure 1-Figure 3 As shown, a method for cleaning a shield construction synchronous dual-liquid slurry injection system, using the system mentioned in the above embodiment 1, includes the following steps:

[0058] Step 1: When the shield machine reaches the end of the excavation process, the B liquid pump 7 is stopped and the B liquid positive flushing mode is entered;

[0059] Step 2, sequentially close the B liquid pump 7, close the fourth valve 15 and the sixth valve 17, open the fifth valve 16, start the flushing water pump 8 to flush the pipeline, and the flushing water is discharged through the grouting port;

[0060] Step 3, turn off the flushing water pump 8, shrink and close the rubber nozzle 36, and then delay the grouting of liquid A for 30-60 seconds;

[0061] Step 4, close the A liquid pump 5, close the second valve 13, the first valve 12, the gate valve 10, close the fifth valve 16, open the third valve 14, the sixth valve 17, and the first valve 12, extend the piston push rod 35 to close the grouting port, and complete the B liquid pipeline flushing.

[0062] Step 5, close the fifth valve 16, open the third valve 14, the sixth valve 17, and the first valve 12, and extend the piston push rod 35 to close the grouting port;

[0063] Step 6: Start the flushing water pump 8 to flush the pipeline, and the flushing water enters the sewage tank 18 through the pipeline;

[0064] Step 7: After flushing is completed, close the third valve 14, the sixth valve 17, and the first valve 12 to complete the backwashing of liquid A.

[0065] When the shield machine advances at a speed lower than 10 mm / min, the grouting is discontinuous due to the slow advance speed. Liquid A is injected every 10 minutes during the stop process to avoid pipe blockage. At the same time, the pipeline is flushed when the shield machine advances about 1 m and after the advance is completed.

[0066] When the shield machine is shut down for a long time, high-concentration bentonite is injected into the shield tail 9 20 cm before the shutdown to play an isolating role and prevent the double liquid slurry from solidifying in a short time and wrapping the shield tail 9, resulting in excessive thrust during repeated pushing, causing damage to the slurry stop plate and steel plate bundle.

[0067] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shield construction synchronous dual-liquid slurry pipeline system, comprising a liquid A pump (5), a liquid B pump (7) and a mixing mechanism (3), wherein the liquid A pump (5) and the liquid B pump (7) are both connected to the mixing mechanism (3), and the discharge port (37) of the mixing mechanism (3) is used to extrude the mixed dual-liquid slurry, characterized in that: The mixing mechanism (3) comprises a main pipeline (31), a first pipeline (32) and a second pipeline (33); one end of the first pipeline (32) is connected to the A liquid pump (5); the other end of the first pipeline (32) is connected to the main pipeline (31); one end of the second pipeline (33) is connected to the B liquid pump (7); the other end of the second pipeline (33) is connected to the main pipeline (31); a piston push rod (35) is provided at one end of the main pipeline (31); the piston push rod (35) is sleeved in the main pipeline (31) to block one end of the main pipeline (31), and can block the connection between the first pipeline (32) and the second pipeline (33) and the main pipeline (31); The other end of the second pipe (33) is connected to the middle section of the first pipe (32), and a rubber nozzle (36) is also provided in the second pipe (33). The rubber nozzle (36) is used to block the connection between the second pipe (33) and the first pipe (32); The mixing mechanism (3) further comprises a third pipe (34), one end of the third pipe (34) being connected to cleaning water, and the other end being connected to the main pipe (31), and the distance between the connection point between the third pipe (34) and the main pipe (31) and the discharge port (37) being greater than the distance between the connection point between the first pipe (32) and the main pipe (31) and the discharge port (37); A gate valve (10), a second valve (13) and a first valve (12) are sequentially arranged between the A liquid pump (5) and the first pipeline (32); the gate valve (10) is arranged between the A liquid tank (1) and the A liquid pump (5); the second valve (13) and the first valve (12) are arranged between the A liquid pump (5) and the first pipeline (32); and a fourth valve (15) is arranged between the B liquid pump (7) and the second pipeline (33); The pipeline system is further provided with a flushing station (11), the flushing station (11) being connected to the second pipeline (33), a flushing water pump (8) being provided between the flushing station (11) and the second pipeline (33), a fifth valve (16) being provided between the flushing water pump (8) and the second pipeline (33), the flushing station (11) being further connected to the third pipeline (34) via a fourth pipeline, one end of the fourth pipeline being connected between the fifth valve (16) and the flushing water pump (8), the other end of the fourth pipeline being connected to the third pipeline (34), a sixth valve (17) being provided on the fourth pipeline, and a fifth pipeline being further provided, one end of the fifth pipeline being connected to the fourth pipeline between the sixth valve (17) and the third pipeline (34), the other end of the fifth pipeline being connected to the second pipeline (33); The pipeline system further comprises a sewage tank (18) and a liquid return pipeline, one end of the liquid return pipeline is connected between the second valve (13) and the first valve (12), the other end of the liquid return pipeline is connected to the sewage tank (18), and a third valve (14) is provided on the liquid return pipeline; The cleaning method of the synchronous double-liquid slurry injection system for shield construction comprises the following steps: Step 1: When the shield machine reaches the end of the excavation process, the B liquid pump (7) is stopped and the B liquid positive flushing mode is entered; Step 2, sequentially closing the liquid B pump (7), closing the fourth valve (15) and the sixth valve (17), opening the fifth valve (16), starting the flushing water pump (8) to flush the pipeline, and discharging the flushing water through the grouting port; Step 3, turn off the flushing water pump (8), shrink and close the rubber nozzle (36), and then delay the grouting of liquid A for 30-60 seconds; Step 4, closing the A liquid pump (5), closing the second valve (13), the first valve (12), and the gate valve (10), closing the fifth valve (16), opening the third valve (14), the sixth valve (17), and the first valve (12), extending the piston push rod (35) to close the grouting port, and completing the flushing of the B liquid pipeline; Step 5, closing the fifth valve (16), opening the third valve (14), the sixth valve (17), and the first valve (12), and extending the piston push rod (35) to close the grouting port; Step 6: Start the flushing water pump (8) to flush the pipeline, and the flushing water enters the sewage tank (18) through the pipeline; Step 7: After flushing is completed, close the third valve (14), the sixth valve (17), and the first valve (12) to complete the backwashing of liquid A.

2. A method for using a synchronous dual-liquid slurry injection system for shield construction, characterized in that: The system according to claim 1 comprises the following steps: S1, adjusting the piston push rod (35) to a closed state, and the rubber nozzle (36) to a retracted closed state; S2, start the liquid B pump (7) and increase the pressure to a value suitable for grouting; S3. When the tunnel boring machine advances a distance of 10-20 cm and the advancing speed is stable, the piston push rod (35) is pulled to open it, and the A liquid pump (5) is started to inject the A liquid into the main pipeline (31) through the first pipeline (32); S4, 15 seconds after the injection of liquid A, the rubber nozzle (36) is pulled to open it, and the liquid B output by the liquid B pump (7) expands the rubber nozzle (36), and the injection of liquid B water glass begins. The liquid B enters the first pipeline (32) through the second pipeline (33) and mixes with the liquid A. The liquid A and the liquid B are mixed in the mixing mechanism (3) to form a uniform gelling material, and the dual-liquid slurry is injected while the shield machine is advancing; S5. Start each synchronous dual-liquid slurry injection point in sequence according to the set order, and observe the grouting pressure and volume; S6. When the shield machine has completed the first 10-20 cm of excavation, the B liquid pump (7) is turned off and the B liquid grouting is stopped; S7. When the shield machine has completed the first 3-5 cm of excavation, the piston push rod (35) is pushed to close the first pipe (32), the grouting of liquid A is stopped, and the piston push rod (35) is continued to be pushed to push the cementitious material in the pipe out of the discharge port (37) with the piston push rod (35), and the discharge port (37) of the main pipe (31) is closed.

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