CN100359100C

CN100359100C - Method for treating soft foundition by fast 'high vacuum impacting dense, pile base' compound method

Info

Publication number: CN100359100C
Application number: CNB2005101349665A
Authority: CN
Inventors: 徐士龙
Original assignee: Individual
Current assignee: Shanghai Bay Infrastructure Construction (group) Ltd By Share Ltd
Priority date: 2005-12-29
Filing date: 2005-12-29
Publication date: 2008-01-02
Anticipated expiration: 2025-12-29
Also published as: WO2007073662A1; MY154548A; CN1793519A

Abstract

The present invention relates to a rapid composite soft foundation treating method for high vacuum tamping pile foundations, which is characterized in that firstly, well point pipes are distributed densely in soft soil, the upper ends of well point pipes are connected to a vacuum pump by a lying pipe, the well point pipes are vacuumized to be pulled out and are tamped, and thus, the vacuumizing process and the tamping process of the well point pipes are carried out alternately for many times; rubble is filled into the soft soil, the soft soil is tamped into piers or becomes a rubble pile by using a pipe sinking method or is stirred into piles by using cement soil, and thus, the soft soil is treated by a vacuum water pumping process by the well point pipes and is tamped alternately for many times to combine rubber piers/ piles or cement soil piles to form a composite foundation. The present invention can effectively and rapidly increase the bearing capacity of foundations and has small settlement after work or small differential settlement.

Description

" high-vacuum densification, pile foundation " A treatment method of composite soft ground fast

Technical field:

The present invention relates to a kind of method of soft soil foundation treatment, be specifically related to a kind of " high-vacuum densification, pile foundation " A treatment method of composite soft ground fast.Be applicable to the processing of large-area soft foundation.Possession base processing technology field.

Background technology:

Large-area soft foundation is handled the general quick ' high-vacuum densification ' soft foundation processing method that adopts at present.Quick ' high-vacuum densification ' soft foundation processing method (the patent No.: be to reach the interior subgrade raising of shallow-layer (10m) bearing capacity fast all over high vacuum close in conjunction with hitting (ramming by force or vibroroller cmpacting) cross action ZL01127046.2), eliminate behind the part worker or the purpose of relative settlement by several.But in a large amount of engineerings, because weak soil thickness is darker, and difference in thickness is bigger, adopts quick ' high-vacuum densification ' soft foundation processing method separately, to behind bearing capacity, the worker or relative settlement etc. all be difficult to meet design requirement.On the other hand, soft foundation also has the pile foundation method of employing (rubble, cement earth pile etc.) to handle, because the frictional resistance of weak soil is lower between its each pile foundation, make that the bearing capacity of pile foundation is extremely low, and settlement after construction is bigger, and the otherness of each pile foundation is bigger, and construction safety hidden danger is more.

Summary of the invention:

The objective of the invention is to overcome above-mentioned deficiency, provide a kind of and can improve bearing capacity of foundation soil effectively fast, behind the worker or little quick " high-vacuum densification, the pile foundation " A treatment method of composite soft ground of relative settlement.

The object of the present invention is achieved like this: a kind of " high-vacuum densification, pile foundation " A treatment method of composite soft ground fast, it is characterized in that: at first, employing is densely covered well point pipe in weak soil, pipe upper end, well point is connected to vacuum pump with lying pipe and vacuumizes reduction weak soil water content, pull out the well point pipe, the close weak soil void ratio that reduces is hit in employing, and so the well point pipe vacuumizes, hits close cross action number time; Then, employing is inserted rubble and is hit Mi Chengdun again in weak soil, or adopt immersed tunnelling method to become broken stone pile, and or adopt cement-soil to stir pile, make weak soil draw water, hit close several by well point pipe vacuum all over intersecting, forming a composite foundation in conjunction with rubble pier or broken stone pile or cement earth pile again.Adjust length and the spacing that close intersection pass and rubble pier/stake or cement earth pile were drawn water, hit to vacuum by calculating, the high-bearing capacity, the high accuracy that reach design are controlled behind the worker and the requirement of relative settlement.

The present invention's " high-vacuum densification, pile foundation " forms composite foundation, its innovation part is to draw water, hit mutual advantageous effect close, pile foundation by high vacuum, that is: pile foundation improves effective drainage channel in weak soil, increase the drainage effect of vacuum at weak soil, the quickening of favourable weak soil is fixed, simultaneously vacuum is drawn water, is hit and closely makes also that frictional resistance improves greatly between pile foundation, and the pile foundation autologous density improves, and has improved bearing capacity of single pile.By length, the spacing of control pile foundation, make behind " high-vacuum densification " deep layer weak soil worker or relative settlement is under control simultaneously.

The specific embodiment:

The present invention is " high-vacuum densification, pile foundation " A treatment method of composite soft ground fast, at first, employing is densely covered (general 1～3m spacing) well point pipe in weak soil, pipe upper end, well point is connected to vacuum pump with lying pipe and vacuumizes, initiatively reduce weak soil water content (hole setting-out), pull out the well point pipe, employing is hit, and close (ramming by force or vibroroller cmpacting) reduces the weak soil void ratio, the well point pipe vacuumizes, hits close cross action number all over (conventional 1～4 time), then, employing is inserted rubble and is hit Mi Chengdun again in weak soil, or adopts immersed tunnelling method to become broken stone pile, or adopts cement-soil to stir pile.

Example:

This method is applied to certain engineering 100,000 m ³Oil tank, the broken stone pile of former design ￠ 1.2, but construction back otherness is bigger, bearing capacity of single pile is low, settlement after construction is difficult to control.This method is adopted in the back, makes processing soft soil and pile foundation acting in conjunction, saves cost more than 30%, and the duration shortens about 50%, and behind the bearing capacity, worker or the relative settlement homogeneous and controllable.

Claims

1, a kind of " high-vacuum densification, pile foundation " A treatment method of composite soft ground fast is characterized in that: at first, adopt the well point pipe that gathers in weak soil, pipe upper end, well point is connected to vacuum pump with lying pipe and vacuumizes, pull out well point pipe, hit closely, so the well point pipe vacuumizes, hits close cross action number time; Then, employing is inserted rubble and is hit Mi Chengdun again in weak soil, or adopt immersed tunnelling method to become broken stone pile, and or adopt cement-soil to stir pile, make weak soil draw water, hit close several by well point pipe vacuum all over intersecting, forming a composite foundation in conjunction with rubble pier or broken stone pile or cement earth pile again.