Device and method for preventing and treating mud cake on cutter head in strongly weathered red sandstone strata

Abstract

The invention discloses a device for preventing and treating mud cake on a cutter disc in a strongly weathered red sandstone stratum. A soil bin is arranged at the rear of the cutter disc. One to three circles of reserved ball valves are installed on the partition of the soil bin. Two to six reserved ball valves can be installed in each circle. The center of each circle of reserved ball valves is located in the same circumferential surface, and the circumferential surface is coaxial with the center of rotation. The reserved ball valve is connected to an outlet of a drainage and pressure relief pipeline. The inlet of the drainage and pressure relief pipeline is connected to an ultra-high pressure cleaning machine, and the other outlet is connected to a collection system. The device is used to perform high-pressure flushing on the center of the cutter disc where mud cake is formed, and the flushed water and slag are discharged to the collection system through a third steel pipe, so as to ensure that there is no mud cake in the center of the cutter disc and the shield machine is in a normal excavation state. The device can be widely applied to the technical field of equipment or devices for preventing and treating mud cake on the cutter disc.

Description

Technical Field

[0001] The invention belongs to the technical field of equipment or devices for preventing and treating mud cakes on the cutter head of a shield machine, and specifically relates to an equipment for preventing and treating mud cakes on the cutter head of a shield machine in a strongly weathered red sandstone stratum and a method for treating mud cakes on the cutter head by using the equipment. Background Art

[0002] In the construction of urban subway shield tunnels, when the shield machine passes through the 4-2-1 strongly weathered sandstone stratum and the 4-2-2 medium weathered sandstone stratum (sandstone is orange-red, fine-grained, layered, and mud-cemented), the stratum mineral composition is mainly quartz, the diagenesis is poor, and the mechanical properties in the natural state are good. It is easy to disintegrate into loose sand when immersed in water or disturbed, and it is very easy to weather after being exposed to the surface. Slightly unreasonable excavation parameters or inadequate slag improvement during shield construction may cause the cutter head to "cake mud" during excavation, causing difficulties in advancement, uncontrollable slag output and excavation speed, and easy to cause ground collapse. Therefore, it is necessary to increase preventive measures in a targeted manner when crossing such strata, and deal with problems in the construction and excavation of the stratum in a timely manner to ensure the smooth progress of shield construction under the conditions of strongly weathered sandstone and medium weathered sandstone strata.

[0003] Generally speaking, there are three ways to clean the "mud cake" on the knife disc:

[0004] 1. Inject dispersant into the cutter head panel or soil bin. After soaking for 48 hours, rotate the cutter head in both directions to clean the slightly formed "mud cake". The disadvantage of this method is that the rotation of the cutter head causes too much disturbance to the stratum. The soaking time is too long, which affects the stability of the face and surrounding soil and is prone to collapse. The injected dispersant is easy to diffuse around and cannot be accumulated between the cutter head and the face for a long time, so it is difficult to play a soaking role.

[0005] 2. The cutter disc has a high rotation speed and a small thrust, which can complete the cleaning of the "mud cake" slightly formed on the cutter disc. The disadvantage of this method is that the rapid rotation of the cutter disc affects the stability of the face and the surrounding soil, which is prone to collapse. The thrust is small, the cutter disc rotates fast, and over-excavation is easy to occur.

[0006] 3. Use the method of opening the warehouse with pressure to complete the cleaning of the "knife disc mud cake"; the disadvantages of this method are that the cost is too high, the risk factor is too high, the pressure of the soil warehouse is not easy to control during operation, the physical fitness requirements of the personnel entering the warehouse are high, the preliminary preparation work is too cumbersome, and the construction period is uncontrollable.

[0007] In summary, it is difficult to solve the problem of cleaning "knife disc mud cake" in a short time, at low cost and safely with the existing processes and methods. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a device for preventing and treating cutter disc mud cake in strongly weathered red sandstone strata which does not affect the stability of the tunnel face and surrounding soil, has low cost and low risk factor, and can safely and effectively solve the problem of cutter disc mud cake, as well as a method for treating cutter disc mud cake using the above-mentioned device.

[0009] The technical solution adopted to solve the above technical problems is: a soil bin is provided behind the cutter disc, and 1 to 3 circles of reserved ball valves are installed on the soil bin partition, 2 to 6 reserved ball valves can be installed in each circle, the center of each circle of reserved ball valves is located in the same circular surface, and the circular surface is coaxial with the rotation center, the reserved ball valve is connected to one outlet of the drainage and pressure relief pipeline, the inlet of the drainage and pressure relief pipeline is connected to the ultra-high pressure cleaning machine, and the other outlet is connected to the collection system.

[0010] The drainage and pressure relief pipeline of the present invention is as follows: one end of a first group of flanges is connected to a first pair of threads, one end of the first pair of threads is connected to an ultra-high pressure cleaning machine and the other end is connected to a first steel pipe, the other end of the first steel pipe is connected to a second group of flanges, the ultra-high pressure cleaning machine gun barrel is inserted through the second group of flanges by the first pair of threads, the other end of the second group of flanges is connected to a second pair of threads, the other end of the second pair of threads is connected to one end of a three-way valve, the opposite end of the three-way valve is connected to a third pair of threads, and the side end is connected to a third steel pipe, the other end of the third steel pipe is provided with a second ball valve, the other end of the third pair of threads is connected to the first ball valve, the other end of the first ball valve is provided with a second steel pipe, and the second steel pipe is connected to a reserved ball valve.

[0011] In the present invention, rubber sealing rings are arranged between the first set of flanges, and rubber sealing rings are arranged between the second set of flanges.

[0012] The rubber sealing ring of the present invention has a conical protrusion in the middle of the sealing ring body, 4 or 6 fixing holes are evenly distributed within 360° phase around the conical protrusion on the sealing ring body, and 3 openings are evenly distributed within 360° phase on the conical protrusion.

[0013] The included angle between the main pipeline and the side pipeline of the three-way valve of the present invention is 30° to 60°.

[0014] The first steel pipe of the present invention is provided with 2 to 6 grease nipples, which are connected to the first steel pipe.

[0015] The processing method of the device for preventing and treating mud cake on the cutter head in the strongly weathered red sandstone stratum of the present invention comprises the following steps:

[0016] S1. Insert the barrel of the high pressure cleaning machine into the first steel pipe and pass through the second set of flanges;

[0017] S2, injecting butter into the first steel pipe through the butter nozzle to fill the gap between the first steel pipe and the barrel of the high-pressure cleaning machine;

[0018] S3. Connect and seal the second steel pipe with the reserved ball valve;

[0019] S4, open the first ball valve and the second ball valve, turn on the high-pressure cleaning machine to wash the mud cake on the cutter disc, and discharge the washed water and slag to the collection system through the third steel pipe;

[0020] S5. During the flushing process, the shield machine driver cooperates with the rotating cutterhead to monitor the soil pressure at all times to prevent gushing;

[0021] S6. After flushing, close the first ball valve and the second ball valve and remove the drainage and pressure relief pipeline.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The present invention only uses a 350bar ultra-high pressure cleaning machine to perform high-pressure washing on the cutter disc during the process of treating the mud cake on the cutter disc. The washed water and slag are discharged to the collection system through the third steel pipe. On the one hand, the high-pressure water flow directly exerts force on the cutter disc. On the other hand, under the immersion effect of the water flow, the mud cake on the cutter disc is easy to fall off, and the water and slag are discharged in time. The stability of the tunnel face and the surrounding soil will not be affected due to the long soaking time, thereby avoiding collapse accidents.

[0024] 2. During the flushing process of the present invention, the shield machine driver cooperates with the rotating cutter disc to avoid rotating the cutter disc at high speed all the time, because the high-speed rotation of the cutter disc affects the stability of the tunnel face and the surrounding soil, and at the same time avoids the problem of over-excavation due to the high rotation speed of the cutter disc.

[0025] 3. The operations of the present invention are all carried out outside the soil bin, a reserved ball valve is arranged on the partition of the soil bin, and the installation and disassembly of the drainage and pressure relief pipeline is simple and quick, which avoids the danger of personnel entering the bin for operation, shortens the construction period and simplifies the process.

[0026] 4. The present invention adopts a rubber sealing ring to seal the gun barrel of the ultra-high pressure cleaning machine, which is equivalent to the function of a one-way valve, preventing the debris and water from overflowing when flushing the cutter disc mud cake. The gap between the first steel pipe and the gun barrel of the ultra-high pressure cleaning machine is filled with butter, which further prevents the debris and water from flowing back from the gap of the gun barrel, thereby reducing the flushing pressure of the cleaning machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0028] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle water pressure relief pipeline 3.

[0029] Figure 3yes Figure 2 Right view of .

[0030] Figure 4 yes Figure 2 Top view of the .

[0031] Figure 5 yes Figure 4 Schematic diagram of the structure of the middle rubber sealing ring 3-11.

[0032] Figure 6 yes Figure 5 Top view of the .

[0033] In the figure: 1. Cutter disc; 2. Soil bin; 3. Drainage and pressure relief pipeline; 4. Reserved ball valve; 5. Rotation center; 3-1. First pair of threads; 3-2. First set of flanges; 3-3. Grease nipple; 3-4. First steel pipe; 3-5. Second set of flanges; 3-6. Second pair of threads; 3-7. Three-way valve; 3-8. Third pair of threads; 3-9. First ball valve; 3-10. Second steel pipe; 3-11. Rubber sealing ring; 3-12. Second ball valve; 3-13. Third steel pipe, 3-11-1. Rubber ring body; 3-11-2. Conical protrusion; 3-11-3. Opening. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below with reference to the accompanying drawings and embodiments, but the present invention is not limited to these embodiments.

[0035] Example 1

[0036] exist Figures 1 to 6 The present invention relates to a device for preventing and treating mud cakes on the cutter disc in strongly weathered red sandstone formations. A soil bin 2 is arranged behind the cutter disc 1 of the shield machine. According to the size of the cutter disc 1, a circle of reserved ball valves 4 is installed on the partition of the soil bin 2. Four reserved ball valves 4 can be installed in each circle. The center of each circle of reserved ball valves 4 is located in the same circumferential surface, and the circumferential surface is coaxial with the rotation center 5, ensuring that the water flow ejected from the gun barrel of the ultra-high pressure cleaning machine can be evenly sprayed on the cutter disc 1, and the mud cakes on the cutter disc are washed more thoroughly. Multiple circles of reserved ball valves 4 are arranged to make the washing area larger. The reserved ball valve 4 is connected to one outlet of the drainage and pressure relief pipeline 3, the inlet of the drainage and pressure relief pipeline 3 is connected to the ultra-high pressure cleaning machine, and the other outlet is connected to the collection system.

[0037] The drainage and pressure relief pipeline 3 of the present invention is composed of a first pair of threads 3-1, a first set of flanges 3-2, a grease nipple 3-3, a first steel pipe 3-4, a second set of flanges 3-5, a second pair of threads 3-6, a three-way valve 3-7, a third pair of threads 3-8, a first ball valve 3-9, a second steel pipe 3-10, a rubber sealing ring 3-11, a second ball valve 3-12, and a third steel pipe 3-13. The first set of flanges 3-2 is composed of two flanges, and a rubber sealing ring 3-11 is installed between the two flanges. Further, the rubber sealing ring 3-11 is composed of a rubber ring body 3-11-1, a conical protrusion 3-11-2 and opening 3-11-3 are connected to form a cylindrical sealing ring body 3-11-1 with a conical protrusion 3-11-2 in the middle, and 4 or 6 fixing holes a are evenly distributed within a 360° phase around the conical protrusion 3-11-2 on the sealing ring body 3-11-1, and 3 openings 3-11-3 are evenly distributed within a 360° phase on the conical protrusion 3-11-2. The gun barrel of the ultra-high pressure cleaning machine passes through the opening 3-11-3. The tension effect causes the opening of the rubber sealing ring 3-11 to be stretched and tightly fitted on the gun barrel of the ultra-high pressure cleaning machine, thereby playing a sealing role.

[0038] One end of the first set of flanges 3-2 is connected to the first pair of wires 3-1, one end of the first pair of wires 3-1 is connected to the ultra-high pressure cleaning machine, and the other end is connected to the first steel pipe 3-4, the other end of the first steel pipe 3-4 is connected to the second set of flanges 3-5, the second set of flanges 3-5 is composed of two flanges, a rubber sealing ring 3-11 is installed between the two flanges, the ultra-high pressure cleaning machine gun barrel is inserted by the first pair of wires 3-1 through the first set of flanges 3-2, the first steel pipe 3-4, the second set of flanges 3-5, the first The rubber sealing ring 3-11 between the first group flange 3-2 and the second group flange 3-5 seals the gun barrel of the ultra-high pressure cleaning machine, which is equivalent to the function of a one-way valve, preventing debris and water from overflowing when flushing the cutter disc mud cake. 2 to 6 butter nipples 3-3 are installed on the first steel pipe 3-4, and the butter nipples 3-3 are connected to the first steel pipe 3-4. The gap between the first steel pipe 3-4 and the gun barrel of the ultra-high pressure cleaning machine is filled with butter through the butter nipples 3-3, further preventing debris and water from flowing back from the gap in the gun barrel, thereby reducing the flushing pressure of the cleaning machine.

[0039] The other end of the second set of flanges 3-5 is connected to the second pair of threads 3-6, the other end of the second pair of threads 3-6 is connected to one end of the three-way valve 3-7, the opposite end of the three-way valve 3-7 is connected to the third pair of threads 3-8, and the side end is connected to the third steel pipe 3-13, the angle between the main pipeline and the side pipeline of the three-way valve 3-7 is 30°~60°, the other end of the third steel pipe 3-13 is installed with the second ball valve 3-12, the other end of the third pair of threads 3-8 is connected to the first ball valve 3-9, the other end of the first ball valve 3-9 is installed with the second steel pipe 3-10, and the second steel pipe 3-10 is sealed and connected to the reserved ball valve 4.

[0040] The above-mentioned method for preventing and treating the mud cake on the cutter head in the strongly weathered red sandstone stratum comprises the following steps:

[0041] S1, insert the barrel of the high pressure cleaning machine into the first steel pipe 3-4 and pass through the second set of flanges 3-5;

[0042] S2, injecting butter into the first steel pipe 3-4 through the butter nozzle 3-3, so that the gap between the first steel pipe 3-4 and the barrel of the high-pressure cleaning machine is filled;

[0043] S3, connect and seal the second steel pipe 3-10 with the reserved ball valve 4;

[0044] S4, open the first ball valve 3-9 and the second ball valve 3-12, turn on the high-pressure cleaning machine to wash the mud cake on the cutter disc, and discharge the washed water and slag to the collection system through the third steel pipe 3-13;

[0045] S5. During the flushing process, the shield machine driver cooperates with the rotating cutterhead to monitor the soil pressure at all times to prevent gushing;

[0046] S6. After flushing is completed, close the first ball valve 3-9 and the second ball valve 3-12, and remove the drainage and pressure relief pipeline 3.

[0047] Example 2

[0048] In the above-mentioned embodiment 1, this embodiment installs 2 circles of reserved ball valves 4 on the partition of the soil bin 2, and each circle can install 6 reserved ball valves 4. The center of each circle of reserved ball valves 4 is located in the same circumferential surface, and the circumferential surface is coaxial with the rotation center 5, and adjacent circles of reserved ball valves 4 are staggered. The remaining components and the connection relationship of the components are exactly the same as those in embodiment 1, and the processing method is exactly the same as that in embodiment 1.

[0049] Example 3

[0050] In the above-mentioned embodiment 1, this embodiment installs 3 circles of reserved ball valves 4 on the partition of the soil bin 2, and each circle can install 3 reserved ball valves 4. The center of each circle of reserved ball valves 4 is located in the same circumferential surface, and the circumferential surface is coaxial with the rotation center 5, and adjacent circles of reserved ball valves 4 are staggered. The remaining components and the connection relationship of the components are exactly the same as those in embodiment 1, and the processing method is exactly the same as that in embodiment 1.

Claims

1. A device for preventing and treating mud cake on cutter disc in strongly weathered red sandstone strata, characterized by: A soil bin (2) is arranged behind the cutter disc (1), and 1 to 3 circles of reserved ball valves (4) are installed on the partition of the soil bin (2), and 2 to 6 reserved ball valves (4) are installed in each circle, and the center of each circle of reserved ball valves (4) is located in the same circumferential surface, and the circumferential surface is coaxial with the rotation center (5). The reserved ball valve (4) is connected to an outlet of a drainage and pressure relief pipeline (3), and the inlet of the drainage and pressure relief pipeline (3) is connected to an ultra-high pressure cleaning machine, and the other outlet is connected to a collection system; the drainage and pressure relief pipeline (3) is: one end of a first group of flanges (3-2) is connected to a first pair of threads (3-1), one end of the first pair of threads (3-1) is connected to the ultra-high pressure cleaning machine, and the other end is connected to a first steel pipe (3-4), and the other end of the first steel pipe (3-4) is connected to the first The two sets of flanges (3-5) are connected, the gun barrel of the ultra-high pressure cleaning machine is inserted through the second set of flanges (3-5) by the first pair of threads (3-1), the other end of the second set of flanges (3-5) is connected to the second pair of threads (3-6), the other end of the second pair of threads (3-6) is connected to one end of a three-way valve (3-7), the opposite end of the three-way valve (3-7) is connected to the third pair of threads (3-8), and the side end is connected to the third steel pipe (3-13), the other end of the third steel pipe (3-13) is provided with a second ball valve (3-12), the other end of the third pair of threads (3-8) is connected to the first ball valve (3-9), the other end of the first ball valve (3-9) is provided with a second steel pipe (3-10), and the second steel pipe (3-10) is connected to the reserved ball valve (4); A rubber sealing ring (3-11) is arranged between the first set of flanges (3-2), and a rubber sealing ring (3-11) is arranged between the second set of flanges (3-5); The rubber sealing ring (3-11) is as follows: a conical protrusion (3-11-2) is processed in the middle of the sealing ring body (3-11-1), 4 or 6 fixing holes (a) are evenly processed in a 360° phase around the conical protrusion (3-11-2) on the sealing ring body (3-11-1), and 3 openings (3-11-3) are evenly processed in a 360° phase on the conical protrusion (3-11-2); The first steel pipe (3-4) is provided with 2 to 6 grease nipples (3-3), and the grease nipples (3-3) are connected to the first steel pipe (3-4).

2. The device for preventing and treating cutterhead mud cake in strongly weathered red sandstone strata according to claim 1, characterized in that: The included angle between the main pipeline and the side pipeline of the three-way valve (3-7) is 30° to 60°.

3. The method for preventing and treating the mud cake on the cutter head in the strongly weathered red sandstone stratum according to any one of claims 1 or 2, comprising the following steps: S1, inserting the barrel of the ultra-high pressure cleaning machine into the first steel pipe (3-4) and passing through the second set of flanges (3-5); S2, injecting butter into the first steel pipe (3-4) through the butter nozzle (3-3), so that the gap between the first steel pipe (3-4) and the barrel of the ultra-high pressure cleaning machine is filled; S3, connecting and sealing the second steel pipe (3-10) and the reserved ball valve (4); S4, opening the first ball valve (3-9) and the second ball valve (3-12), turning on the ultra-high pressure cleaning machine to wash the mud cake on the cutter disc, and discharging the washed water and slag to the collection system through the third steel pipe (3-13); S5. During the flushing process, the shield machine driver cooperates with the rotating cutterhead to monitor the soil pressure at all times to prevent gushing; S6. After flushing is completed, close the first ball valve (3-9) and the second ball valve (3-12), and remove the drainage and pressure relief pipeline (3).

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