人工挖孔大直径扩底桩的设计探讨

Study on Design of Large Diameter Bulb Pile Constructed by Manual Excavation

人工挖孔大直径扩底桩具有承载能力高 ,结构传力简明 ,地质条件合适时沉降小等优点。使用该类桩时 ,需解决两个问题 ,即桩、柱及连系梁共同工作的内力分析 ;基桩轴向受压承载力的确定。从桩、柱及连系梁共同工作的内力分析出发 ,认为桩帽设计是基桩设计的一个重要内容。介绍了人工挖孔大直径扩底桩的设计思路。

Large diameter bulb pile constructed by manual excavation has many advantages,such as high bearing capacity,direct load transfer,and little settlement on proper geological conditions.In order to use this kind of pile,two problems have to be solved:the combined work stresses of pile,column and tie beam must be correctly analyzed;how to get the axial pressure bearing capacity properly must be defined.According to analysis of the combined work stresses of pile,column and tie beam,this paper introduces design approach to this kind of pile and emphasizes the design key point design procedure of the pile shoe.In the paper a design example is given.$$$$