The Survey Of Disease Of Bridge Pile Foundation And Cause Analysis And The Study Of Strengthening Technology In The Loess Gulley Region

Pile foundation is one of the most common girder bridge foundations in loess area. Thereis usually the flood damage occurred on bridge and culvert of the high-grade-way in thismountain area every year along the route, this serious influence highway traffic normaloperation. In order to sharpen the anti-flood damage ability of bridge and culvert ofhigh-grade highway in mountainous area, has the necessity to carry on the carefulinvestigation very much in view of the bridge and culvert flood damaged condition, analyzesthe bridge and culvert flood damaged mechanism, studies its prevention countermeasure.This thesis is based on the actual support project, a research has been made about thediseases of girder bridge pile foundation along the expressway from Yan’an to Zhidan to Wuqi,and the common diseases are classified and summarized in order to analyze the cause,themechanism and the effect to capacity and durability deeply. Erosion damage、mudslidedamage and landslide damage to the pile foundation is mainly researched, and the safetyprotection measures are proposed. Through the analysis of the pile,this is exposed, owing todifferent gully locations of the pile and soil erosion, influences on bearing capacity of the pilewith diversities, all of which provide a reference for the design of the new bridge.Accordingto local geological features, some security control measures to pile erosion was presented, onthis paper, uneven settlement of pile foundation of loess area also analyzed,and some controlmeasure to pile foundation settlement of the loess gully terrain was proposed; simultaneouslyanalyzes the reasons and influence on pile bearing capacity caused by tilting pile foundation,structural abnormal stress, cracks and other disease..Different reinforcement methods areproposed for the diseases of pile foundation. In order to ensure the quality of bridges andreinforce them, detection methods of the quality of pile foundation and capacity are proposed.This thesis is based that the common diseases are classified and summarized in order toanalyze the cause, then draw some conclusions, which can provide reference for the design、bridge construction bridge construction and maintenance management in the similar area.