Quality Appraisal And Acciddent Processed Technique On Bored Cast-in-plale Pile

The bored cast-in-place pile has the following advantages ,such as accessing the soil deeply, accessing the rock stratum, high rigidity and bearing capacity, small deformation, and convenient to underwater. Recent years, with the development of technology, the pile types and patterns, construction machines and tools, construction craft and pile foundation design theory and design method and so on evolved and developed fastly. At present the pile foundation can acess the soil 107 meters, the diameter of pile is more than 4 meters, the biggest diameter of pile surpasses 5 meters in China.Because the construction process and formation condition are different, the quality accidents of pile foundations occurred frequently. The gereral processing method there :injected method, break pile-join pile method, additional pile method in various countries. At present, there are few people to research the problem of how to process the quality accidents of pile foundations. In fact, implement of all kinds of processing method is related with contruction environment.In this paper the construction craft and essential craft control main point of bored cast-in-place pile are systematical summarized, the common quality questions and the reason are summarized and analyzed, many kinds of pile foundation quality appraisal methods are instructed.At present the strengthened cast-in-place pile technic of raised formed steel method of concrete institution strengthened technic is be used to process the pile foundation quality accident. The principle is to drill some holes on the pile install stiff steel bars, associate steel bars and concrete piles formed a whole by press injected method. Which can compensate the loss of strength is caused by the disfigarement of the pile body concrete from adding in the stiffness rebar bundle, to get same area and inertia monment as good pile.By the research on the pile foundation quality appraisal and damage processing technique of Baoan Rongjingyuan of Shenzhen, all processing methods and...