预应力管桩终压值控制静压施工技术.pdf

2014年10月上 施工技术 第43卷第19期 CONSTRUCTION TECHNOLOGY 61 D0I:10.7672/5j52014190061 预应力管桩终压值控制静压施工技术 徐左屏，许小云 (上海智富建设工程有限公司，上海200336) [摘要]为了解决浅强持力层预应力管桩单桩承载力和桩身强度匹配问题，采用端承为主、摩擦为辅的桩型设计， 以桩身允许抗压强度作为终压值P和试验检测极限值的依据，通过探孔、静压、送桩、桩尖持力层强挤密、终压值 控制、稳压和注浆技术，在相同桩型、柱长和压桩工艺条件下提高单桩承载力30%~40%，有效减少桩基初始和不 均匀沉降，从根本上解决资源浪费和节约桩基设计、施工成本. [关键词]桩基础；管桩；静压桩；承载力；施工技术 [中图分类号]TU753.3 [文献标识码]A [文章编号]1002-8498(2014)19-0061-04 Construction Technology of Controlling Static Pressure on the Base of Prestressed Pile Final Pressure Value Xu Zuoping Xu Xiaoyun (Shanghai I F Construction Projects Co.Lid.Shanghai 200336 China) Abstract:In order to resolve the shallow strong supporting layer prestressed pipe pile capacity and pile strength matching problem this paper adopted end bearing friction supplemented pile design on the base of the final pressure value Pu and detection limit value.Through exploring holes static pressure sending piles pile tip bearing stratum strong paction final pressure value control regulation and grouting technology under the same type of pile pile length and pile pressure conditions this kind of design can increase the pile bearing capacity of 30%to 40% effectively reduce the initial pile and uneven settlement fundamentally solve the dilemma of waste of resources and finally meet the requirement of conservation of pile design and low construction costs. Key words:piles;pipe piles;static pressure piles;bearing capacity;construction 0引言 度变化而各不相同. 由于预应力管桩承载力受土层地质影响，承载 2)预应力管桩的实际有效桩长须通过不同区 力极限值一般只...