Pump drainage type vacuum preloading soft foundation strengthening method

Abstract

The invention discloses a vacuum preloading soft foundation strengthening method. After a pump drainage type plastic drainage plate with double drainage passages is driven in, an air guide passage in the middle of a core plate of the pump drainage type plastic drainage plate with the double drainage passages is connected with each branch pipe through a pipe plate connecting piece, and each branch pipe is connected with a main pipe; a vacuum pump, the main pipe, the branch pipes, the pipe plate connecting piece and the air guide passage in the drainage plate form a complete continuous vacuum pipeline system; the vacuum pump is used for delivering vacuum negative pressure to soil layers at different depths via water inlet holes at an interval of 2-3 m in the drainage plate through the air guide passage in the core plate, so that the linear loss transferred by the vacuum pressure and the attenuation of the vacuum negative pressure along the plastic drainage plate are reduced, and higher vacuum negative pressure of the entire plastic drainage plate from top bottom is kept; and thus, high vacuum degree is kept in the shallow and deep parts of a soft foundation, the effective strengthening depth and the strengthening effect of the vacuum preloading method are increased, and the strengthening cost is reduced.

Description

technical field [0001] The invention relates to a pumping-type vacuum preloading method for strengthening soft foundations, in particular to a foundation reinforcement method in the technical field of construction engineering, mainly applying a pumping-type plastic drainage board with double drainage channels to vacuum preloading This method forms a new soft foundation treatment technology, which is suitable for the treatment of large-area silt soil foundations and dredging and reclamation soil foundations. Background technique [0002] Vacuum preloading method is a ground reinforcement method that uses vacuuming to strengthen soft soil foundations. It was first proposed by Professor W. Kjellman of the Royal Swedish Geological Institute in 1952. After continuous exploration and research by engineers from various countries, some The relatively mature technical scheme of using the principle of vacuum preloading method to strengthen soft soil foundation has developed from a sin...

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Problems solved by technology

Although the invention mentions that the connecting pipe can be placed in the drainage board to a certain depth (at present, it can reach 0~3m under the membrane), the vacuum transmission path can be shortened to a certain extent, the vacuum degree of the shallow soft foundation can be improved, and the vacuum can be transferred to the drainage board through the drainage board. The vacuum degree in the deep part of the soft foundation decays to a very low level, and the vacuum degree in the deep part of the soft foundation cannot be increased

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