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Drag reduction method of thixotropic slurry

A thixotropic mud and slurry technology, which is used in pipeline laying and maintenance, pipe/pipe joints/pipe fittings, mechanical equipment, etc., can solve problems such as large resistance of thixotropic mud, and achieve high drag reduction efficiency, reduced resistance and low cost. Effect

Active Publication Date: 2015-04-22
CHINA MCC17 GRP
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Problems solved by technology

[0005] The present invention aims at the technical problem of relatively high resistance of thixotropic mud existing in the existing pipe jacking construction, and provides a drag reduction method of thixotropic mud. The specific steps of the method are as follows:

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  • Drag reduction method of thixotropic slurry
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  • Drag reduction method of thixotropic slurry

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Embodiment Construction

[0032] The invention provides a drag reduction method for thixotropic mud, the specific implementation steps of the method are as follows:

[0033] (1) Prepare thixotropic mud for drag reduction:

[0034] Thixotropic mud consists of sodium bentonite, carboxymethyl cellulose (CMC), sodium carbonate (Na 2 CO 3 ), clean water and an appropriate amount of admixture, the mass percent of each composition of the thixotropic mud is: sodium bentonite 10-20%, carboxymethyl cellulose 0.3-0.5%, sodium carbonate 0.2-0.4%, clean water and An appropriate amount of admixture is 80-90%; batching is carried out according to the composition mass percentage of the thixotropic mud, and then the stirred thixotropic mud is put into the slurry storage tank after stirring with a mixer for 12h-24h, so that the bentonite The particles fully absorb water and swell into a colloid; the main properties of the prepared thixotropic mud for drag reduction are: density 1.1-1.17g / cm 3 , viscosity 30-80s (meas...

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Abstract

The invention discloses a drag reduction method of thixotropic slurry, and belongs to the technical field of civil engineering. The method includes the steps: firstly, preparing the thixotropic slurry for drag reduction; secondly, placing stirred thixotropic slurry into a slurry storage tank, forming a grouting hole and connecting a grouting pipeline; thirdly, calculating grouting pressure and selecting a grouting pump; finally, performing grouting. The thixotropic slurry comprises sodium bentonite, carboxymethyl cellulose, sodium carbonate, clean water and an appropriate amount of admixture. Frictional drag of a pipe and soil is decreased by a grouting process, the vertex distance can be increased by 40%-70% after lubrication and drag reduction by the grouting process, drag of a top pipe in work can be effectively reduced, the top pipe with a large caliber and a long distance can continuously extend, and the drag reduction method has the advantages of low cost, easiness in technical implementation and high drag reduction efficiency.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a method for reducing drag of thixotropic mud. The method is applied in non-excavation engineering constructions such as pipe jacking, caissons, and drilling. Lubrication to reduce the frictional resistance of the soil and improve work efficiency. Background technique [0002] With the continuous advancement of my country's urbanization process, trenchless construction technology is being more and more widely used in construction projects such as pipe jacking, caissons, and drilling in urban comprehensive pipe networks. Due to the impact of frictional resistance of the soil, To a certain extent, the construction speed is restricted, and even the construction cannot be carried out. How to reduce the frictional resistance of the soil and improve the construction efficiency of trenchless engineering has become an important technical problem in this technical fi...

Claims

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Application Information

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IPC IPC(8): F16L1/028C04B30/00
CPCC04B30/00F16L1/028
Inventor 黄忠周如明黄超肖来兵
Owner CHINA MCC17 GRP
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