Closed direct-sucking sectional vacuum preloading foundation treatment method

Abstract

The invention relates to a closed direct-sucking sectional vacuum preloading foundation treatment method. The technology comprises the following contents: an installed vertical plastic drainage plate comprises a part inserted in a soil body and a part flatly attached to the soil surface, a drainage system on the surface of the soil body is composed of the part (of the plastic drainage plate) flatly attached to the soil surface, a seal joint, an air-tight sealing water pipe and an air-tight main sealing pipe, and then after an operation of geomembrane sealing is completed, the drainage system is connected with a vacuumizing device so as to carry out closed direct-sucking; for a vacuum preloading foundation treatment project which carries out pretreated cushion layer construction by using the joint application of long and short plates, after an operation of carrying out pretreated cushion layer construction on the short plate construction is completed, in the process of installing the long plate to carry out deep foundation treatment, filter cloth (in a shallow soil body section) in the part that the long plate is inserted in the soil body is subjected to surface sealing treatment or directly replaced with the sealing water pipe, so that the long plate of the vertical plastic drainage plate is changed into a three-section pipe with an air-tight middle section so as to carry out sectional direct-sucking. By using the technology, a vacuum degree transfer effect is improved while the duricrust layer on a surface soil body is formed and the strength of a deep soil layer is improved, thereby realizing the rapidness, high efficiency and energy saving of construction.

Description

technical field [0001] The invention relates to a closed direct pumping segmental vacuum preloading foundation treatment method, which is mainly suitable for drainage treatment of soft soil, ultra-soft soil foundation or sludge, and belongs to the field of geotechnical engineering. Background technique [0002] Since the introduction and application of vacuum preloading technology in the 1980s, through continuous improvement and development, vacuum preloading technology has become one of the most effective methods for soft soil foundation treatment. Before the present invention, construction methods such as no-sand cushion technology, in-line vacuum preloading technology, pressurized vacuum preloading technology, long and short plate combined vacuum preloading technology have been produced, laying a solid foundation for the large-scale engineering application of vacuum preloading technology. foundation. [0003] The effect of vacuum preloading on soft soil foundation is ref...

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Problems solved by technology

[0008] The method relates to a closed direct pumping segmented vacuum preloading method, which overcomes the problem of high vacuum degree under the membrane in conventional vacuum preloading but low vacuum degree transfer efficiency in vertical plastic drainage boards; it is used in combination of long and short boards In the vacuum preloading foundation treatment, this method overcomes the vacuum degree loss of the long slab in the shallow soil body, and is beneficial to the reinforcement treatment of the deep soil body

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