桥梁钻孔灌注桩施工工程实例（Construction example of bridge bored pile）.docVIP

桥梁钻孔灌注桩施工工程实例（Construction example of bridge bored pile） Combined with the construction example of bored pile in bridge, the common causes of broken pile are analyzed, and the treatment method after broken pile is introduced. With the rapid development of Chinas transportation infrastructure construction, bored pile is a basic form for its simple construction, strong adaptability, moderate cost etc., foundation construction has been widely used in highway bridges and other engineering fields in. But because the bored pile is a concealed project, if there is any carelessness or omission in the construction, the quality accident of the cast-in-place pile and the broken pile will appear. A brief analysis of the causes of broken pile is made, and some technical methods for dealing with the broken pile are introduced. Analysis of the causes of 1. broken piles (1) in the process of pouring concrete, the surface elevation of concrete has been measured, which leads to the too small buried depth of the pipe, the phenomenon of uplift and leakage, and the formation of interlayer broken pile. Especially in the later stage of bored pile, when the overpressure is too small or the instrument is not accurate, it is easy to mistake the mixed soil layer in the mud as the surface of the concrete. (2) in the process of pouring pipe buried depth is too large, too long, at the beginning of the concrete pouring concrete caused by excessive liquidity has been reduced, thereby increasing the friction force of concrete and tube wall, in the promotion of connecting bolt breaking or duct rupture and broken pile. (3) due to the randomness of artificial ingredients and poor sense of responsibility, the error of concrete mixture ratio in the course of the implementation is great, so that the slump fluctuates greatly, mixing the mixture when it is thin and dry. Slump is too large will have the coarse aggregate segregation phenomenon, squeezing catheter obstruction; slump is too small or too long p