文档介绍：Bored pile; broken pile （钻孔灌注桩断桩）
Key words: practice quality, drilling hole, bridge defect, perfusion treatment paper
iles and the treatment of defective piles in Jiao Cheng expressway. In
1 in the basic situation in in in
Jiao Cheng expressway is a local highway built by self financing of Jiaozuo Highway Bureau. It is 56. 274km in length and constructed in two phases. Construction of a phase of the project has 43. 6km subgrade works and bridges and culverts and other structures, a total of 711 bored piles. The topography of the project is mainly located in the alluvial plain of the Yellow River and Qin River, where the geology is unstable. KO ' K20 range, less than 20m soil mainly for the Loess and sandy loam and loam, fine sand, water depth of about 1. 0m, loess like loam soft plastic or plastic flow, fine sand in a loose, locally dense, belonging to poor geological section. The 18 defects in the project are concentrated in this section, accounting for 2. 53% of the total. In
1 in several kinds of defects of pile forming and treatment in
In 2. 1 in broken pile in in in
Analysis of the causes of broken pile formation in 2. 1. 1 Broken pile is a serious quality accident. For the factors that cause the pile to be broken, it is necessary to completely eliminate the hidden dangers in the early stage of construction, and must also prepare corresponding countermeasures to pre