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Shield tail sealing grease for high water pressure resistant shield and preparation method thereof

A technology of shield tail sealing and sealing grease, which is applied in the petroleum industry, lubricating compositions, etc., can solve problems such as poor balance, affecting normal construction, and potential safety hazards, and achieves the effect of low price and good pumpability

Active Publication Date: 2017-06-30
CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In domestic shield construction, especially in high water pressure (0.4-0.65MPa) shield construction, once the shield tail sealing system fails, it will affect the normal construction and delay the construction period; it may cause river (sea) water backflow , resulting in major safety hazards, so in order to ensure that the shield tail sealing system is absolutely safe and reliable, the construction unit would rather buy imported shield tail seal grease at a high price than use low-priced domestic products
The reason is that domestic products have poor balance between high water pressure resistance and pumpability. At the same time, the pumpability performance is greatly affected by the ambient temperature, and the overall performance lags behind imported products. Under high water pressure, shield tail sealing grease for shield tunneling is monopolized by imported products

Method used

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  • Shield tail sealing grease for high water pressure resistant shield and preparation method thereof
  • Shield tail sealing grease for high water pressure resistant shield and preparation method thereof

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preparation example Construction

[0022] The embodiment of the present invention also provides a preparation method of shield tail sealing grease for high water pressure resistant shield tunneling. It is used for the above-mentioned sealing grease, and each component is obtained according to the above-mentioned sealing grease formula, including the following steps:

[0023] Dissolve polyisobutylene in base oil 150N, heat up to 50-100°C, stir for 20-40 minutes to obtain a mixed solution; inject the mixed solution into a kneader, set the temperature of the kneader to 50-100°C, then add lignocellulose, Mineral fiber, after stirring for 10 minutes, continue to add organic bentonite, calcium carbonate, talcum powder and barium sulfate; after stirring for 10 minutes, add lithium-based grease, and stir for 30-60 minutes, and filter through a filter with a pore size of 10-15mm to obtain High water pressure resistant shield tail seal grease.

Embodiment 1

[0026] In the present embodiment, the high water pressure resistant shield is used for the shield tail sealing grease, and its formula components are: 14% of base oil 150N, 21% of polyisobutylene (PB1300, PB2400), 17% of lithium base grease, and 6% of organic bentonite , lignocellulose 5%, mineral fiber (sepiolite) 3%, calcium carbonate (heavy) 24%, barium sulfate 5% and talc 5%.

[0027] The preparation process of the shield tail seal grease for high water pressure shield tunneling is as follows: First, dissolve polyisobutylene (PB1300 and PB2400) in base oil 150N, heat up to 50-100°C, and stir for 20-40min; inject the mixed solution into the kneader , set the temperature of the kneader to 50-100°C, then add lignocellulose, mineral fiber (asbestos, sepiolite); after stirring for 10 minutes, continue to add organic bentonite, calcium carbonate (heavy), talcum powder and barium sulfate; stir After 10 minutes, add lithium-based grease, stir for 30-60 minutes, and filter through ...

Embodiment 2

[0033] In the present embodiment, the shield tail sealing grease for high water pressure resistant shield, its formula components and weight percentages are: base oil 150N 12%, polyisobutylene (PB1300, PB2400) 23%, lithium base grease 17%, organic bentonite 4%, lignocellulose 4%, mineral fiber (sepiolite) 4%, the balance is calcium carbonate (heavy) 26%, barium sulfate 8% and talcum powder 2%.

[0034] The preparation method of the shield tail sealing grease for high water pressure resistant shield tunneling is the same as that in Example 1, and will not be described again.

[0035]The test of the shield tail sealing grease sample prepared in this embodiment for high water pressure resistant shield tunneling can withstand a water pressure of 6 MPa at 25°C in the laboratory. The physical and chemical indicators of the shield tail sealing grease for high water pressure resistant shield tunneling are the same as those in the first embodiment.

[0036] Compared with the shield ta...

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Abstract

The invention discloses a shield tail sealing grease for a high water pressure resistant shield and a preparation method thereof. The grease is composed of the following components in percentage by weight: 8-18% of base oil 150N, 10-30% of polyisobutene, 10-30% of lithium-based grease, 1-10% of organic bentonite, 2-6% of lignocellulose, 1-5% of mineral fiber, 20-40% of calcium carbonate, 5-10% of barium sulfate and 5-10% of talcum powder. The shield tail sealing grease for the high water pressure resistant shield provided by the invention can be resistant to the water pressure of 6MPa at the temperature of 25 DEG C in a laboratory, and still has good pumping performance, with a price that is only 60% of that of an imported product. In construction of an actual shielding site, the shield tail sealing grease can be resistant to the high water pressure of 0.45-0.65MPa, meanwhile is excellent in comprehensive performance, and meets requirements of shield tail sealing in construction of high water pressure shield tunnels cross rivers and seas.

Description

technical field [0001] The invention relates to a shield tail sealing grease, in particular to a shield tail sealing grease for high water pressure resistant shield tunneling and a preparation method thereof. Background technique [0002] According to incomplete statistics, in the next five years, the total length of new cross-river tunnels planned in China will exceed 500 kilometers. Due to the large diameter of the shield machine required for cross-river tunnels, high water pressure, high formation permeability coefficient, and extremely complex geological conditions, etc., construction risks, especially the risk of shield tail seal failure, increase exponentially, so the shield tail seals currently used All oils are imported products. Calculated on the basis that a large-diameter shield machine with a diameter of 14 meters consumes 180 tons of imported pump-type shield tail sealing grease for 1 kilometer on average, it will consume 36,000 tons. The current price of impor...

Claims

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Application Information

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IPC IPC(8): C10M169/00C10N40/34C10N50/10
CPCC10M169/00C10M2201/08C10M2201/084C10M2201/103C10M2201/1036C10M2203/045C10M2205/026C10M2207/40C10M2209/12C10N2010/04C10N2030/36C10N2040/34C10N2050/10
Inventor 王德乾孙世豪宋德斌章远方万鹏王浩严振林姚坤峰周衍领
Owner CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP
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