Pump drainage type vacuum preloading soft foundation strengthening method

A vacuum and soft foundation technology, which is applied in infrastructure engineering, soil protection, construction, etc., can solve the problems of low vacuum degree and inability to improve the vacuum degree deep in the soft foundation, so as to reduce the impact, shorten the transmission path, reduce the The effect of transmission loss

Inactive Publication Date: 2013-11-13
HOHAI UNIV
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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 found

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  • Pump drainage type vacuum preloading soft foundation strengthening method
  • Pump drainage type vacuum preloading soft foundation strengthening method
  • Pump drainage type vacuum preloading soft foundation strengthening method

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Embodiment Construction

[0038] Utilize the extraction type vacuum preloading method step of the present invention to reinforce the soft ground as follows:

[0039] (1) Determine the depth, spacing and other layout parameters of the drainage board according to the soil properties and design requirements of the stratum;

[0040] (2) Level the site and lay the working cushion 7 (sand and gravel cushion or sand cushion) on the surface of the foundation to improve the bearing capacity of the foundation so that the construction equipment can enter the operation;

[0041] (3) Plug-in plate, drive the drainage plate 11 with air guide channel into the design depth, after the drainage plate is installed, a hole will be formed in the surface working cushion, this hole must be backfilled with sand in time, otherwise it will affect its drainage Effect: the exposed length above the working cushion on the surface of the drainage board is not less than 200mm, so as to be connected with the tube-sheet connector 10; ...

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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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Application Information

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IPC IPC(8): E02D3/10
Inventor 张福海陈雷郭帅杰任鹏勋钱秋颖
Owner HOHAI UNIV
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