仙岳路人行天桥人工挖孔灌注桩的施工难点及技术处理

采用人工挖孔灌注桩作为桥梁基础,其特有的大承载力优势得到了得到了设计单位、施工单位的认可,其施工机具、设备简单,施工操作较为方便,占用场地小,边挖边支护的特点,以及对周围道路及管线影响小,适合城市繁华地段建造人行天桥的要求,确实是一种在软弱土地基上经济适用的基础形式。本文对厦门市仙岳路人行天桥人工挖孔灌注施工中出现的地下水位高、流沙、桩身混凝土浇筑、桩身围护等难点提出了技术处理办法。

The difficulties of construction and the technique dispose about the manual excavating pile hole in the XianYue Route pedestrian overcrossing

Adopting the manual excavating pile hole in the foundati on of bridge, the special advantage of the great bearing capacity is certificate d by the design units and the construction units. The simple construction equip m ents, the convenient construction operations, the small fields used, the support ing with digging and the low influence on the routes and pipelines hereabout are perfect characteristics. The way is fit to build pedestrian overcrossing in th e flourishing city. It is a sort of economical and applicable foundation form in the soft foundation. In the paper, it comes up with the technical disposal meas u res to the difficulties in XianYue Route, Xiamen, which includes the high water table, the quicksand, the excavating pile hole concrete of pile, the enclosure of pile and so on in the construction of the manual excavating pile hole in th e pedestrian overcrossing.