A method for preparing high-viscosity salt-resistant bentonite suspended slurry for pipe jacking

Abstract

A method for preparing high-viscosity salt-resistant bentonite suspension mud for pipe jacking, comprising: a high-viscosity sodium carboxymethyl cellulose (CMC) raw material bin, a polyacrylamide (PAM) raw material bin, a xanthan gum bin, a meter, a feed pipe, a stirring tank reduction motor, a stirring tank stirring arm, a stirring arm shaft, a mud stirring tank, a mud valve, an upper beam frame of the stirring tank, a mud pump, a mud pipe, an alkali water tank, an alkali water tank reduction motor, an alkali water tank stirring arm shaft, an alkali water pump, an alkali water pipe valve, a soda ash bin, and a soda ash bin metering device. The equipment is equipped with a meter and a feed pipe for the soda ash warehouse outlet, a stirring arm shaft and a stirring arm are installed in the alkali water tank to mix the soda ash and water evenly, and the alkali water pump sends the alkali water into the mud mixing tank. The bentonite meter is controlled by a computer, calcium-based bentonite is added to the mud mixing tank, stirred and allowed to stand, and then high-viscosity sodium carboxymethyl cellulose (CMC), polyacrylamide (PAM) and xanthan gum are added and stirred fully. The mud is pumped to the construction site for use.

Description

Technical Field

[0001] The invention discloses a method for preparing high-viscosity and salt-resistant bentonite suspended mud for pipe jacking, belonging to the technical field of non-metallic mineral material production. Background Art

[0002] With the needs of urban construction development, pipe jacking construction is becoming more and more common, and the requirements for construction technology level, construction machinery performance, pipe jacking friction reduction mud performance, etc. are getting higher and higher, and the application prospects of pipe jacking friction reduction mud are becoming more and more extensive; as an important part of pipe jacking technology, the preparation technology of pipe jacking friction reduction mud needs to adjust the mud formula in time according to different geological and stratigraphic conditions to meet the needs of engineering construction and ensure the smooth progress of construction, and also save production costs and resources; in the pipe jacking construction in cities in coastal areas of my country, the mud will encounter seawater erosion, so the mud must have corresponding anti-seawater erosion performance. Sand and gravel formations are often encountered in pipe jacking construction, so the mud is required to have a higher viscosity and can It can quickly form gel in the loose sand and gravel formation to ensure that a complete mud sleeve is formed between the top pipe and the formation, which plays a role in reducing friction, filling and protecting the wall, and supporting the top pipe construction; the current mature top pipe friction reduction mud adopts bentonite thixotropic mud, and the basic mud materials are bentonite, soda ash and water. Lubricants, viscosity enhancers, filtration reducers, sand carrying agents, etc. are added according to different geological formation conditions, and the ratio is controlled so that the mud prepared on site can meet the construction needs; but at present, for the convenience of engineering construction, various solid additives are evenly mixed and added to the bentonite powder in the factory according to the corresponding ratio. After being transported to the site, water is directly added to stir evenly to make slurry and age it for a period of time before construction. According to the national standard GB / T 20973-2020 bentonite, the viscosity and dynamic plastic ratio of bentonite engineering mud are tested, and it is difficult to reach a high viscosity (R 600 >60 mPa.s), and the dynamic-plastic ratio is less than 1.5; although the bentonite slurry prepared by this method can also meet the performance requirements of friction-reducing slurry for pipe jacking construction in coastal cities, the cost of additives in this synthetic bentonite powder is often too high, which will increase the cost of engineering construction and cannot meet the production or construction needs of enterprises. Summary of the invention

[0003] In order to solve the above problems, a method for preparing high-viscosity and salt-resistant bentonite suspended mud for pipe jacking can prepare high-standard salt-resistant bentonite mud at the construction site, which can not only meet the mud quality standard requirements but also reduce the construction cost.

[0004] In order to solve the above technical problems, a method for preparing high-viscosity salt-resistant bentonite suspended mud for jacking pipe is disclosed, comprising: a high-viscosity sodium carboxymethyl cellulose (CMC) raw material bin, a polyacrylamide (PAM) raw material bin, a xanthan gum bin, a high-viscosity CMC meter, a PAM raw material meter, a xanthan gum meter, a high-viscosity CMC feed pipe for No. 1 mixing tank, a high-viscosity CMC feed pipe for No. 2 mixing tank, a high-viscosity CMC feed pipe for No. 3 mixing tank, a PAM feed pipe for No. 1 mixing tank, a PAM feed pipe for No. 2 mixing tank, a PAM feed pipe for No. 3 mixing tank, a xanthan gum feed pipe for No. 1 mixing tank, a xanthan gum feed pipe for No. 2 mixing tank, a xanthan gum feed pipe for No. 3 mixing tank, a reduction motor for No. 1 mixing tank, a reduction motor for No. 2 mixing tank, a reduction motor for No. 3 mixing tank, a stirring arm for No. 1 mixing tank, a stirring arm for No. 2 mixing tank, a stirring arm for No. 3 mixing tank, a stirring arm for No. 1 mixing tank arm shaft, stirring arm shaft of No. 2 mixing tank, stirring arm shaft of No. 3 mixing tank, No. 1 mud mixing tank, No. 2 mud mixing tank, No. 3 mud mixing tank, mud valve of No. 1 mixing tank, mud valve of No. 2 mixing tank, mud valve of No. 3 mixing tank, upper beam frame of mixing tank, mud pump, mud pipe, mud pump outlet pipe, alkali water tank, alkali water tank reduction motor, stirring arm shaft of alkali water tank, stirring arm of alkali water tank, water inlet pipe, alkali water pump, water inlet pipe of alkali water pump , alkali water pump outlet pipe, alkali water pipe valve of No. 1 mud mixing tank, alkali water pipe valve of No. 2 mud mixing tank, alkali water pipe valve of No. 3 mud mixing tank, soda ash silo, soda ash silo meter, soda ash discharge pipe, bentonite silo, bentonite silo No. 1 meter, bentonite silo No. 2 meter, bentonite silo No. 3 meter, bentonite silo No. 1 discharge pipe, bentonite silo No. 2 discharge pipe, bentonite silo No. 3 discharge pipe.

[0005] The process is as follows: first, fill a certain volume of alkaline water pool with tap water. According to the process requirements, the alkali-to-water ratio is 0.2-0.25%. The computer controls the soda ash warehouse meter to add 0.2-0.25% soda ash. The soda ash warehouse outlet is equipped with a soda ash warehouse meter. The soda ash warehouse meter outlet is equipped with a soda ash discharge pipe, and the soda ash discharge pipe outlet is connected to the upper mouth of the alkaline water pool.

[0006] An alkali water pool stirring arm shaft is installed in the middle of the alkali water pool, an alkali water pool reduction motor is installed on the upper end of the alkali water pool stirring arm shaft, and multiple groups of alkali water pool stirring arms are installed on the lower part of the alkali water pool stirring arm shaft. The rotating alkali water pool stirring arm fully stirs the soda ash and water.

[0007] One end of the alkali water pump inlet pipe is connected to the alkali water tank, and the other end is connected to the alkali water pump. One end of the alkali water pump outlet pipe is connected to the water outlet end of the alkali water pump, and the other end of the alkali water pump outlet pipe is connected to the alkali water pipe valve of No. 1 mud mixing tank, the alkali water pipe valve of No. 2 mud mixing tank, and the alkali water pipe valve of No. 3 mud mixing tank. The water outlet ends of the valves are connected to No. 1 mud mixing tank, No. 2 mud mixing tank, and No. 3 mud mixing tank respectively.

[0008] First, open the alkaline water pipe valve of No. 1 mud mixing tank, close the alkaline water pipe valve of No. 2 mud mixing tank, close the alkaline water pipe valve of No. 3 mud mixing tank, start the alkaline water pump, and transport alkaline water to No. 1 mud mixing tank according to process requirements.

[0009] At the same time, the computer controls the No. 1 bentonite silo metering device at the bentonite silo outlet, and adds 7-10% of the weight of calcium-based bentonite to the alkaline water in the No. 1 mud mixing tank according to the process requirements. At the same time, the reduction motor of the No. 1 mixing tank is started to drive the stirring arm shaft of the No. 1 mixing tank. The stirring arm of the No. 1 mixing tank rotates to fully mix the calcium-based bentonite and the alkaline water.

[0010] The calcium-based bentonite mud is stirred evenly, and the sodium ions in the soda ash replace the calcium ions in the bentonite, so that the calcium-based bentonite mud is modified into a sodium-based bentonite mud.

[0011] The reaction process needs to be left to stand for 20-48 hours, with intermittent stirring every 4-8 hours to ensure uniform reaction and sufficient replacement.

[0012] In the sodium bentonite mud pool, the high-viscosity sodium carboxymethyl cellulose (CMC) meter at the bottom of the raw material bin is controlled by a computer. According to the process requirements, 0.05-0.1% of the high-viscosity CMC raw material of the mud mass is added, and the material is discharged into the No. 1 mud mixing tank through the high-viscosity CMC discharge pipe of the No. 1 mixing tank.

[0013] The PAM raw material meter at the bottom of the polyacrylamide (PAM) raw material bin is controlled by a computer. According to the process requirements, 0.05-0.1% of the PAM raw material of the mud mass is added, and the material is discharged into the No. 1 mud mixing tank through the PAM raw material discharge pipe of the No. 1 mixing tank.

[0014] The xanthan gum meter at the bottom of the xanthan gum silo is controlled by a computer. According to the process requirements, 0.05-0.12% of the weight of the mud is added with xanthan gum, and the material is discharged into the No. 1 mud mixing tank through the xanthan gum discharge pipe of the No. 1 mixing tank.

[0015] High-viscosity sodium carboxymethyl cellulose (CMC), polyacrylamide (PAM) and xanthan gum are added and stirred fully to obtain high-viscosity salt-resistant bentonite suspended mud for pipe jacking that meets the construction requirements.

[0016] Then open the mud valve of No. 1 mixing tank under the No. 1 mud mixing tank, and close the mud valve of No. 2 mixing tank and the mud valve of No. 3 mixing tank.

[0017] Start the mud pump, the mud enters the mud pump through the mud pipe, passes through the mud pump outlet pipe, and is sent to the construction site for use.

[0018] The working procedure of No. 2 mud mixing tank is basically the same as that of No. 1 mud mixing tank: first open the alkaline water pipe valve of No. 2 mud mixing tank, close the alkaline water pipe valve of No. 1 mud mixing tank, close the alkaline water pipe valve of No. 3 mud mixing tank, start the alkaline water pump, and transport alkaline water to No. 2 mud mixing tank according to the process requirements.

[0019] At the same time, the computer controls the bentonite silo No. 2 metering device at the bentonite silo outlet, and adds 7-10% of the weight of alkaline water to the No. 2 mud mixing tank according to the process requirements. At the same time, the reduction motor of the No. 2 mixing tank is started to drive the stirring arm shaft of the No. 2 mixing tank. The stirring arm of the No. 2 mixing tank rotates to fully mix the calcium-based bentonite and the alkaline water.

[0020] The calcium-based bentonite mud is stirred evenly, and the sodium ions in the soda ash replace the calcium ions in the bentonite, so that the calcium-based bentonite mud is modified into a sodium-based bentonite mud.

[0021] The reaction process needs to be left to stand for 20-48 hours, with intermittent stirring every 4-8 hours to ensure uniform reaction and sufficient replacement.

[0022] In the sodium bentonite mud pool, the high-viscosity sodium carboxymethyl cellulose (CMC) meter at the bottom of the raw material bin is controlled by a computer. According to the process requirements, the high-viscosity CMC raw material with an addition amount of 0.05-0.1% of the mud weight is discharged into the No. 2 mud mixing tank through the high-viscosity CMC discharge pipe of the No. 2 mixing tank.

[0023] The PAM raw material metering device at the bottom of the polyacrylamide (PAM) raw material bin is controlled by a computer. According to the process requirements, the PAM raw material with an addition amount of 0.05-0.1% of the mud weight is discharged into the No. 2 mud mixing tank through the PAM raw material discharge pipe of the No. 2 mixing tank.

[0024] The xanthan gum metering device at the bottom of the xanthan gum silo is controlled by a computer. According to the process requirements, xanthan gum with an addition amount of 0.5-0.12% of the mud weight is discharged into the No. 2 mud mixing tank through the xanthan gum discharge pipe of the No. 2 mixing tank.

[0025] High-viscosity sodium carboxymethyl cellulose (CMC), polyacrylamide (PAM) and xanthan gum are added and stirred fully to obtain high-viscosity salt-resistant bentonite suspended mud for pipe jacking that meets the construction requirements.

[0026] Then open the mud valve of No. 2 mixing tank under the No. 2 mud mixing tank, and close the mud valve of No. 1 mixing tank and the mud valve of No. 3 mixing tank.

[0027] Start the mud pump, the mud enters the mud pump through the mud pipe, passes through the mud pump outlet pipe, and is sent to the construction site for use.

[0028] The working procedure of No. 3 mud mixing tank is basically the same as that of No. 1 mud mixing tank: first open the alkaline water pipe valve of No. 3 mud mixing tank, close the alkaline water pipe valve of No. 1 mud mixing tank, close the alkaline water pipe valve of No. 2 mud mixing tank, start the alkaline water pump, and transport alkaline water to No. 3 mud mixing tank according to the process requirements.

[0029] At the same time, the computer controls the bentonite silo No. 3 metering device at the bentonite silo outlet, and adds 7-10% of the weight of alkaline water to the No. 3 mud mixing tank according to the process requirements. At the same time, the reduction motor of the No. 3 mixing tank is started to drive the stirring arm shaft of the No. 3 mixing tank. The stirring arm of the No. 3 mixing tank rotates to fully mix the calcium-based bentonite and the alkaline water.

[0030] The calcium-based bentonite mud is stirred evenly, and the sodium ions in the soda ash replace the calcium ions in the bentonite, so that the calcium-based bentonite mud is modified into a sodium-based bentonite mud.

[0031] The reaction process needs to be left to stand for 20-48 hours, with intermittent stirring every 4-8 hours to achieve uniform reaction and sufficient replacement.

[0032] In the fully reacted sodium bentonite mud pool, the high-viscosity sodium carboxymethyl cellulose (CMC) meter at the bottom of the raw material bin is controlled by a computer. According to the process requirements, 0.05-0.1% of the high-viscosity CMC raw material of the mud mass is added, and the material is discharged into the No. 3 mud mixing tank through the high-viscosity CMC discharge pipe of the No. 3 mixing tank.

[0033] The PAM raw material metering device at the bottom of the polyacrylamide (PAM) raw material bin is controlled by a computer. According to the process requirements, the PAM raw material with an addition amount of 0.05-0.1% of the mud weight is discharged into the No. 3 mud mixing tank through the PAM raw material discharge pipe of the No. 3 mixing tank.

[0034] The xanthan gum meter at the bottom of the xanthan gum silo is controlled by a computer. According to the process requirements, 0.05-0.12% of the xanthan gum mass of the mud is added and discharged into the No. 3 mud mixing tank through the xanthan gum discharge pipe of the No. 3 mixing tank.

[0035] High-viscosity sodium carboxymethyl cellulose (CMC), polyacrylamide (PAM) and xanthan gum are added and stirred fully to obtain high-viscosity salt-resistant bentonite suspended mud for pipe jacking that meets the construction requirements.

[0036] Then open the mud valve of No. 3 mixing tank under the No. 3 mud mixing tank, and close the mud valve of No. 1 mixing tank and the mud valve of No. 2 mixing tank.

[0037] Start the mud pump, the mud enters the mud pump through the mud pipe, and is sent to the construction site through the mud pump outlet pipe for use.

[0038] A method for preparing a high-viscosity and salt-resistant bentonite suspended slurry for pipe jacking has the following improvements.

[0039] The invention adopts a suspension method of artificial sodium bentonite mud, which has the best technical effect. The suspension method is to add a proper amount of soda ash and water to calcium-based bentonite and stir to make a suspension, and then age the suspension for a period of time to make calcium ions and sodium ions in the soda ash aqueous solution undergo ion exchange reaction to obtain a fully reacted sodium-based bentonite suspension mud.

[0040] The present invention adopts the sodium bentonite slurry by suspension method at the construction site, which effectively saves the need for the bentonite production enterprise to produce sodium bentonite powder by liquid filtration, drying, grinding and finally making artificial sodium bentonite powder. This process requires a lot of electricity, heat, labor, equipment and other costs.

[0041] The present invention simplifies the whole process of producing sodium-based bentonite powder by the production enterprise, and it is very easy to prepare high-viscosity sodium-based bentonite mud suspension at the construction site, which can greatly reduce the amount of expensive additives and save a lot of construction costs.

[0042] Experiments have shown that when 5-10% of seawater is added to the sodium bentonite mud suspension produced by this method and stirred evenly, the mud viscosity can still basically remain stable or increase slightly. The mud gel is also very stable after being left to stand for more than two days, and there is no flocculation and stratification phenomenon.

[0043] The production of high-viscosity and salt-resistant bentonite suspension mud uses calcium-based bentonite ore powder as raw material, which can save raw material costs, facilitate the purchase of raw materials nearby, and save transportation costs.

[0044] This system can be designed as a small and flexible set of facilities that is easy to carry and remove, which will be more convenient for construction units to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] Attached Figure 1 It is a schematic diagram of the structure of the present invention.

[0047] Attached Figure 1A method for preparing a high-viscosity salt-resistant bentonite suspension slurry for pipe jacking includes: 1. a high-viscosity sodium carboxymethyl cellulose (CMC) raw material bin, 2. a polyacrylamide (PAM) raw material bin, 3. a xanthan gum bin, 4. a high-viscosity CMC meter, 5. a PAM raw material meter, 6. a xanthan gum meter, 7. a high-viscosity CMC feed pipe for a mixing tank No. 1, 8. a high-viscosity CMC feed pipe for a mixing tank No. 2, 9. a high-viscosity CMC feed pipe for a mixing tank No. 3, 10. a PAM feed pipe for a mixing tank No. 1, 11. a PAM feed pipe for a mixing tank No. 2, 12. a PAM feed pipe for a mixing tank No. 3, 13. a xanthan gum feed pipe for a mixing tank No. 1, 14. a xanthan gum feed pipe for a mixing tank No. 2, 15. a xanthan gum feed pipe for a mixing tank No. 3, 16. a reduction motor for a mixing tank No. 1, 17. a reduction motor for a mixing tank No. 2, 18. No. 3 mixing tank reduction motor, 19. No. 1 mixing tank stirring arm, 20. No. 2 mixing tank stirring arm, 21. No. 3 mixing tank stirring arm, 22. No. 1 mixing tank stirring arm shaft, 23. No. 2 mixing tank stirring arm shaft, 24. No. 3 mixing tank stirring arm shaft, 25. No. 1 mud mixing tank, 26. No. 2 mud mixing tank, 27. No. 3 mud mixing tank, 28. No. 1 mixing tank mud valve, 29. No. 2 mixing tank mud valve, 30. No. 3 mixing tank mud valve, 31. Mixing tank upper beam, 32. Mud pump, 33. Mud pipe, 34. Mud pump slurry pipe, 35. Alkali water tank, 36. Alkali water tank reduction motor, 37. Alkali water tank stirring arm shaft, 38. Alkali water tank stirring arm, 39. Water inlet pipe, 40. Alkali water pump, 41. Alkali water pump inlet pipe, 42. Alkali water pump outlet pipe, 43. Alkali water pipe valve of No. 1 mud mixing tank, 44. Alkali water pipe valve of No. 2 mud mixing tank, 45. Alkali water pipe valve of No. 3 mud mixing tank, 46. Soda ash silo, 47. Soda ash silo meter, 48. Soda ash discharge pipe, 49. Bentonite silo, 50. Bentonite silo No. 1 meter, 51. Bentonite silo No. 2 meter, 52. Bentonite silo No. 3 meter, 53. Bentonite silo No. 1 discharge pipe, 54. Bentonite silo No. 2 discharge pipe, 55. Bentonite silo No. 3 discharge pipe. DETAILED DESCRIPTION

[0048] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0049] A method for preparing a high-viscosity and salt-resistant bentonite suspended mud for pipe jacking, the method comprising the following steps: a certain volume of an alkaline water pool 35 is filled with water, and according to the process requirements, a computer controls a soda ash bin metering device 47 to add 0.2-0.25% of soda ash, a soda ash bin metering device 47 is installed at the outlet of a soda ash bin 46, a soda ash discharge pipe 48 is installed at the outlet of the soda ash bin metering device 47, and the outlet of the soda ash discharge pipe 48 is connected to the upper opening of the alkaline water pool 35.

[0050] An alkali water pool stirring arm shaft 37 is installed in the middle of the alkali water pool 35, an alkali water pool reduction motor 36 is installed on the upper end of the alkali water pool stirring arm shaft 37, and multiple groups of alkali water pool stirring arms 38 are installed at the lower part of the alkali water pool stirring arm shaft 37. The rotating alkali water pool stirring arms 38 fully stir the soda ash and water.

[0051] One end of the alkali water pump inlet pipe 41 is connected to the alkali water tank 35, and the other end is connected to the alkali water pump 40. One end of the alkali water pump outlet pipe 41 is connected to the water outlet end of the alkali water pump 40, and the other end of the alkali water pump outlet pipe 41 is connected to the alkali water pipe valve 43 of the No. 1 mud mixing tank, the alkali water pipe valve 44 of the No. 2 mud mixing tank, and the alkali water pipe valve 45 of the No. 3 mud mixing tank. The valve outlet ends are connected to the No. 1 mud mixing tank 25, the No. 2 mud mixing tank 26, and the No. 3 mud mixing tank 27 respectively.

[0052] First, open the alkaline water pipe valve 43 of the No. 1 mud mixing tank, close the alkaline water pipe valve 44 of the No. 2 mud mixing tank, close the alkaline water pipe valve 45 of the No. 3 mud mixing tank, start the alkaline water pump 40, and transport alkaline water to the No. 1 mud mixing tank 25 according to the process requirements.

[0053] At the same time, the bentonite silo No. 1 metering device 50 at the outlet of the bentonite silo 49 is controlled by a computer, and 7-10% of the weight of the alkaline water is added to the No. 1 mud mixing tank 25 according to the process requirements. At the same time, the No. 1 mixing tank reduction motor 16 is started to drive the No. 1 mixing tank stirring arm shaft 22 and the No. 1 mixing tank stirring arm 19 to rotate, so as to fully mix the calcium-based bentonite and the alkaline water.

[0054] The calcium-based bentonite mud is stirred evenly, and the calcium-based bentonite mud is modified into a sodium-based bentonite mud by exchanging the calcium ions in the bentonite with the sodium ions in the soda ash.

[0055] The reaction process needs to be left to stand for 20-48 hours, with intermittent stirring every 4-8 hours to ensure uniform reaction and sufficient replacement.

[0056] In the fully reacted sodium bentonite mud pool, a high-viscosity sodium carboxymethyl cellulose (CMC) metering device 4 at the lower part of the raw material bin 1 is controlled by a computer, and 0.05-0.1% of the high-viscosity CMC raw material of the mud mass is added according to the process requirements, and the high-viscosity CMC raw material is discharged into the No. 1 mud mixing tank 25 through the high-viscosity CMC discharge pipe 7 of the No. 1 mixing tank.

[0057] The PAM raw material metering device 5 at the bottom of the polyacrylamide (PAM) raw material bin 2 is controlled by a computer, and 0.05-0.1% of the PAM raw material mass of the mud is added according to the process requirements, and the raw material is discharged into the No. 1 mud mixing tank 25 through the PAM raw material discharge pipe 10 of the No. 1 mixing tank.

[0058] The xanthan gum meter 6 at the bottom of the xanthan gum silo 3 is controlled by a computer, and 0.05-0.12% of the mass of the mud is added according to the process requirements. The xanthan gum is discharged into the No. 1 mud mixing tank 25 through the xanthan gum discharge pipe 13 of the No. 1 mixing tank.

[0059] High-viscosity sodium carboxymethyl cellulose (CMC), polyacrylamide (PAM) and xanthan gum are added and stirred fully to obtain high-viscosity salt-resistant bentonite suspended mud for pipe jacking that meets the construction requirements.

[0060] Then open the mud valve 28 of the No. 1 mixing tank below the No. 1 mud mixing tank 25, and close the mud valve 29 of the No. 2 mixing tank and the mud valve 30 of the No. 3 mixing tank.

[0061] The mud pump 32 is started, and the mud enters the mud pump 32 through the mud pipe 33, and is sent to the construction site for use through the mud pump outlet pipe 34.

[0062] The working procedure of the No. 2 mud mixing tank 26 is: first open the alkaline water pipe valve 44 of the No. 2 mud mixing tank, close the alkaline water pipe valve 43 of the No. 1 mud mixing tank, close the alkaline water pipe valve 45 of the No. 3 mud mixing tank, start the alkaline water pump 40, and transport alkaline water to the No. 2 mud mixing tank 26 according to the process requirements.

[0063] At the same time, the bentonite silo No. 2 metering device 51 at the outlet of the bentonite silo 49 is controlled by a computer, and 7-10% of the weight of the alkaline water is added to the No. 2 mud mixing tank 26 according to the process requirements. At the same time, the No. 2 mixing tank reduction motor 17 is started to drive the No. 2 mixing tank stirring arm shaft 23 and the No. 2 mixing tank stirring arm 20 to rotate, so as to fully mix the calcium-based bentonite and the alkaline water.

[0064] In the uniformly stirred calcium-based bentonite slurry, the sodium ions in the soda ash are exchanged for the calcium ions in the bentonite, so that the calcium-based bentonite slurry is modified into the sodium-based bentonite slurry.

[0065] The reaction process needs to be left to stand for 20-48 hours, with intermittent stirring every 4-8 hours to achieve uniform reaction and sufficient replacement.

[0066] In the fully reacted sodium bentonite mud pool, a high-viscosity sodium carboxymethyl cellulose (CMC) metering device 4 at the lower part of the raw material bin 1 is controlled by a computer, and 0.05-0.1% of the high-viscosity CMC raw material of the mud mass is added according to the process requirements, and the high-viscosity CMC raw material is discharged into the No. 2 mud mixing tank 26 through the high-viscosity CMC discharge pipe 8 of the No. 2 mixing tank.

[0067] The PAM raw material metering device 5 at the bottom of the polyacrylamide (PAM) raw material bin 2 is controlled by a computer, and 0.05-0.1% of the PAM raw material mass of the mud is added according to the process requirements, and the material is discharged into the No. 2 mud mixing tank 26 through the No. 2 mixing tank PAM raw material discharge pipe 11.

[0068] The xanthan gum meter 6 at the bottom of the xanthan gum silo 3 is controlled by a computer, and 0.05-0.12% of the mass of the mud is added according to the process requirements. The xanthan gum is discharged into the No. 2 mud mixing tank 26 through the xanthan gum discharge pipe 14 of the No. 2 mixing tank.

[0069] High-viscosity sodium carboxymethyl cellulose (CMC), polyacrylamide (PAM) and xanthan gum are added and stirred fully to obtain high-viscosity salt-resistant bentonite suspended mud for pipe jacking that meets the construction requirements.

[0070] Then open the No. 2 mixing tank mud valve 29 below the No. 2 mud mixing tank 26, and close the No. 1 mixing tank mud valve 28 and the No. 3 mixing tank mud valve 30.

[0071] The mud pump 32 is started, and the mud enters the mud pump 32 through the mud pipe 33, and is sent to the construction site for use through the mud pump outlet pipe 34.

[0072] The working procedure of No. 3 mud mixing tank 27 is: first open the alkaline water pipe valve 45 of No. 3 mud mixing tank, close the alkaline water pipe valve 43 of No. 1 mud mixing tank, close the alkaline water pipe valve 44 of No. 2 mud mixing tank, start the alkaline water pump 40, and transport alkaline water to No. 3 mud mixing tank 27 according to the process requirements.

[0073] At the same time, the bentonite silo No. 3 metering device 52 at the outlet of the bentonite silo 49 is controlled by a computer, and 7-10% of the weight of the alkaline water is added to the No. 3 mud mixing tank 27 according to the process requirements. At the same time, the No. 3 mixing tank reduction motor 18 is started to drive the No. 3 mixing tank stirring arm shaft 24 and the No. 3 mixing tank stirring arm 21 to rotate, so as to fully mix the calcium-based bentonite and the alkaline water.

[0074] The calcium-based bentonite mud is stirred evenly, and the calcium-based bentonite mud is modified into a sodium-based bentonite mud by exchanging the calcium ions in the bentonite with the sodium ions in the soda ash.

[0075] The reaction process needs to be left to stand for 20-48 hours, with intermittent stirring every 4-8 hours to achieve uniform reaction and sufficient replacement.

[0076] In the fully reacted sodium bentonite mud pool, a high-viscosity sodium carboxymethyl cellulose (CMC) metering device 4 at the bottom of the raw material bin 1 is controlled by a computer, and 0.05-0.1% of the high-viscosity CMC raw material of the mud mass is added according to the process requirements, and the high-viscosity CMC raw material is discharged into the No. 3 mud mixing tank 27 through the high-viscosity CMC discharge pipe 9 of the No. 3 mixing tank.

[0077] The PAM raw material metering device 5 at the bottom of the polyacrylamide (PAM) raw material bin 2 is controlled by a computer, and 0.05-0.1% of the PAM raw material mass of the mud is added according to the process requirements, and the material is discharged into the No. 3 mud mixing tank 27 through the PAM raw material discharge pipe 12 of the No. 3 mixing tank.

[0078] The xanthan gum meter 6 at the bottom of the xanthan gum silo 3 is controlled by a computer, and 0.05-0.12% of the mass of the mud is added according to the process requirements. The xanthan gum is discharged into the No. 3 mud mixing tank 27 through the xanthan gum discharge pipe 15 of the No. 3 mixing tank.

[0079] High-viscosity sodium carboxymethyl cellulose (CMC), polyacrylamide (PAM) and xanthan gum are added and stirred fully to obtain high-viscosity salt-resistant bentonite suspended mud for jacking pipes that meets the construction requirements.

[0080] Then open the No. 3 mixing tank mud valve 30 below the No. 3 mud mixing tank 27, and close the No. 1 mixing tank mud valve 28 and the No. 2 mixing tank mud valve 29.

[0081] The mud pump 32 is started, and the mud enters the mud pump 32 through the mud pipe 33, and is sent to the jacking site of the drilling platform under construction through the mud pump outlet pipe 34 for use.

[0082] The three mud mixing tanks cycle through slurry making and static reaction in a repetitive cycle.

[0083] Example 1: Prepare a soda ash solution with an alkali-water ratio of 0.2%, add 7% sodium bentonite into a mud stirring tank and stir thoroughly, let it stand for 20 hours, and repeat the stirring every 4-5 hours, then add 0.05% high-viscosity sodium carboxymethyl cellulose (CMC) raw material, 0.05% polyacrylamide (PAM) raw material, and 0.05% xanthan gum powder and stir thoroughly again to obtain a high-viscosity salt-resistant bentonite suspension mud with sodium bentonite as the basic raw material.

[0084] Example 2: Prepare a soda ash solution with an alkali-water ratio of 0.25%, add 10% calcium bentonite into a mud stirring tank and stir thoroughly, let it stand for 20 hours, and repeat the stirring every 4-5 hours, then add 0.1% high-viscosity sodium carboxymethyl cellulose (CMC) raw material, 0.1% polyacrylamide (PAM) raw material, and 0.12% xanthan gum powder and stir thoroughly again to obtain a high-viscosity salt-resistant bentonite suspension mud with calcium bentonite as the basic raw material.

Claims

1. A method for preparing a high-viscosity, salt-resistant bentonite suspension slurry for pipe jacking, comprising: High viscosity sodium carboxymethyl cellulose (CMC) raw material warehouse, polyacrylamide (PAM) raw material warehouse, xanthan gum warehouse, high viscosity CMC meter, PAM raw material meter, xanthan gum meter, high viscosity CMC feed pipe for mixing tank No. 1, high viscosity CMC feed pipe for mixing tank No. 2, high viscosity CMC feed pipe for mixing tank No. 3, PAM feed pipe for mixing tank No. 1, PAM feed pipe for mixing tank No. 2, PAM feed pipe for mixing tank No. 3, xanthan gum feed pipe for mixing tank No. 1, xanthan gum feed pipe for mixing tank No. 2, xanthan gum feed pipe for mixing tank No. 3, reduction motor for mixing tank No. 1, reduction motor for mixing tank No. 2, reduction motor for mixing tank No. 3, stirring arm for mixing tank No. 1, stirring arm for mixing tank No. 2, stirring arm for mixing tank No. 3, stirring arm shaft for mixing tank No. 1, stirring arm shaft for mixing tank No. 2 , No. 3 mixing tank stirring arm shaft, No. 1 mud mixing tank, No. 2 mud mixing tank, No. 3 mud mixing tank, No. 1 mixing tank mud valve, No. 2 mixing tank mud valve, No. 3 mixing tank mud valve, mixing tank upper beam, mud pump, mud pipe, mud pump discharge pipe, alkali water tank, alkali water tank reduction motor, alkali water tank stirring arm shaft, alkali water tank stirring arm, water inlet pipe, alkali water pump, alkali water pump inlet pipe, alkali water pump outlet pipe, No. 1 mud mixing tank alkali water pipe valve, No. 2 mud mixing tank alkali water pipe valve, No. 3 mud mixing tank alkali water pipe valve, soda ash silo, soda ash silo meter, soda ash discharge pipe, bentonite silo, bentonite silo No. 1 meter, bentonite silo No. 2 meter, bentonite silo No. 3 meter, bentonite silo No. 1 discharge pipe, bentonite silo No. 2 discharge pipe , bentonite silo No. 3 discharge pipe; its operation is as follows: first, fill a certain volume of alkali water pool with tap water, control the computer to add a certain amount of soda ash to the soda ash silo meter, the soda ash silo outlet is equipped with a soda ash silo meter, the soda ash silo meter outlet is equipped with a soda ash discharge pipe, and the soda ash discharge pipe outlet is connected to the upper mouth of the alkali water pool; an alkali water pool stirring arm shaft is installed in the middle of the alkali water pool, an alkali water pool reduction motor is installed at the upper end of the alkali water pool stirring arm shaft, and multiple groups of alkali water pool stirring arms are installed at the lower part of the alkali water pool stirring arm shaft, and the rotating alkali water pool stirring arms fully mix the soda ash and water; one end of the alkali water pump inlet pipe is connected to the alkali water pool, and the other end is connected to the alkali water pump, one end of the alkali water pump outlet pipe is connected to the alkali water pump outlet end, and the other end of the alkali water pump outlet pipe is connected to the No. 1 mud mixing tank alkali water pipe valve, the No. 2 mud mixing tank alkali water pipe valve, and the No. 3 The valves of the alkali water pipes of the mud mixing tanks are connected, and the water outlets of the valves are connected to the No. 1 mud mixing tank, the No. 2 mud mixing tank, and the No. 3 mud mixing tank respectively; first, the valve of the alkali water pipe of the No. 1 mud mixing tank is opened, the valve of the alkali water pipe of the No. 2 mud mixing tank is closed, and the valve of the alkali water pipe of the No. 3 mud mixing tank is closed, and the alkali water pump is started to transport alkali water to the No. 1 mud mixing tank; at the same time, the No. 1 metering device of the bentonite silo at the outlet of the bentonite silo is controlled by a computer to add a certain amount of calcium-based bentonite to the No. 1 mud mixing tank, and at the same time, the reduction motor of the No. 1 mixing tank is started to drive the stirring arm shaft of the No. 1 mixing tank, and the stirring arm of the No. 1 mixing tank rotates to fully stir the calcium-based bentonite and the alkali water, let it stand for 20 hours, and repeat the stirring every 4-5 hours to modify the calcium-based bentonite mud into sodium-based bentonite mud;In the sodium-based bentonite slurry pool after the reaction is fully completed, the high-viscosity sodium carboxymethyl cellulose (CMC) metering device at the bottom of the raw material bin is controlled by a computer to discharge a certain amount of high-viscosity sodium carboxymethyl cellulose (CMC) raw material through the high-viscosity CMC discharge pipe of the No. 1 mixing tank into the No. 1 mud mixing tank; the PAM raw material metering device at the bottom of the polyacrylamide (PAM) raw material bin is controlled by a computer to discharge a certain amount of PAM raw material through the PAM raw material discharge pipe of the No. 1 mixing tank into the No. 1 mud mixing tank; the xanthan gum metering device at the bottom of the xanthan gum bin is controlled by a computer The device discharges a certain amount of xanthan gum through the xanthan gum discharge pipe of the No. 1 mixing tank into the No. 1 mud mixing tank; high viscosity sodium carboxymethyl cellulose (CMC), polyacrylamide (PAM) and xanthan gum are added and fully stirred to obtain salt-resistant bentonite suspension mud for pipe jacking that meets the construction requirements; then the mud valve of the No. 1 mixing tank below the No. 1 mud mixing tank is opened, and the mud valves of the No. 2 mixing tank and the No. 3 mixing tank are closed; the mud pump is started, and the mud enters the mud pump through the mud pipe, and is sent to the pipe jacking site of the drilling platform under construction through the mud pump outlet pipe for use. ; 2. The method for preparing a high-viscosity and salt-resistant bentonite suspension slurry for pipe jacking according to claim 1 is characterized by: The working procedures of No. 2 mud mixing tank and No. 3 mud mixing tank are the same as that of No. 1 mud mixing tank.

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