挤实碎石（砂）桩施工工艺.doc

A． 施工方法
a.   恢复中线，放出路段边线桩，清理平整施工段地基表面。做好排水系统，保证排水通道的畅通。
工工艺.rar挤实碎石（砂）桩b. 测绘挤实碎石桩平面图，准确放出桩位并编号。
c. 将沉管机就位，套管对准桩孔，提起芯管从外围或路基二侧向路中间顺序进行沉管。
d. 按设计填料量填筑碎石，锤击下沉至设计深度。
e. 提起芯管，填注碎石英钟，锤击套管芯管，将碎石挤出套管，提起套管芯管。
f. 两次填筑碎石，锤击芯管，使碎石挤实，直至形成碎石桩柱。
g. 挤实碎石桩的质量以填料量和密实电流控制。直径为0.5m的碎石桩的碎石置换量约0.224m3，锤击挤密的密实电流控制在40——50A。施工时应作好记录，使桩身密实度达到设计要求。
h. 施工路段打桩结束后，平整桩顶及周围地面，除去浮土压实，再铺筑25cm碎石垫层压实。

B． 工艺流程框图
Compaction gravel (sand) pile
A. Construction Method
a. recovery center line, release sideline section pile, the construction of Ground flat surface cleaning. Good drainage system to ensure the smooth flow of drainage channels.
b. Gravel Compaction Pile plan mapping, accurate release Pile and number.
c. the immersed tube machine in place, casing aligned pile hole, core pipe brought from outside or middle of the road embankment side order of two immersed tube.
d. Design of packing capacity by filling gravel, sank to the design depth of the hammer.
e. bring core pipe, filling broken quartz clock, hammering the core casing pipe, casing out of the rubble, raised core pipe casing.
f. two filling of rubble, hammer the core tube, so Gravel fact, until the formation of gravel piles.
g. Compaction quality of stone columns to fill current control volume and density. 0.5m diameter pile of gravel replacement of gravel about 0.224m3, hammer compaction of the dense current control in the 40 - 50A. Construction should be well recorded, so pile density to meet the design requirements.
h. After the construction of roads piling, pile top and the surrounding ground level, remove the surface dust compaction, and then paving 25cm compacted hardcore.


B. Process Diagram