Application Of The Excavating Pile Bored With Long Auger In Hanlin Royal Scenery Garden

Our country has a vast in territory which the geological conditions is complicated.During constructing we usually encounter the situation of the saturated thick sand ground. Inthis situation we must plan carefully if we need to build piles, otherwise, we maybe pay a lotin cost and time and don’t have any expected effect, furthermore have the opposite effect.In the past ten years, we maybe use the high-strength prestressed pipe pile or the boredpile in saturated thick sand ground, but the effect is not so satisfactory. When we usehigh-strength prestressed pipe pile as the foundation, we will find that the piles draft after bepiled for the distances of the piles too close or the piles can not reach the designed depth forthe skin friction of the pile is so great. When we use the bored pile, we need high qualificationof slurry for preventing collapse of borehole, but slurry’s qualification is not easy to control inthe saturated thick sand ground. If the slurry is too viscous,it will be hard to drill in and theslurry circle will be interrupt. If the slurry is too thin it will be easy to be necking or collapsedin borehole, furthermore the pile will be broken. That case is often seen in projects. Thequalification of the pile can not be guaranteed, the economic losses is huge.Before discussion, we define the thick sand ground, so that we can get easier to see theparticularity of the thick sand ground and the difficulty of driving piles into the thick sandground through the1oad transfer mechanization between the piles and the soil. And then weaim at the particularity of the thick sand ground and draw into the technology of theexcavating pile bored with long auger inserted reinforcing steel cage after jacked concrete.Through practical engineering examples the use of such pile in thick sand ground is described.It is proved such a pile type is very useful and economic.