PHC管桩基础施工常见质量问题的辨析(国外英文资料).docVIP

PHC管桩基础施工常见质量问题的辨析(国外英文资料) Analysis of common quality problems in construction of PHC pipe pile foundation Chen Xiao [Abstract] the quality problems for pile foundation construction in common, the causation and relevant measures for in-depth analysis and elaboration, to strengthen the pile foundation construction quality management, improve the quality of the project, provide reference for optimizing construction method. Pipe pile; construction design; control requirement; soil squeezing effect; pile spacing Pile failure, bored pile, clamping force, stress concentration 0 Introduction The PHC prestressed pipe pile foundation because of its short construction period, high bearing capacity of single pile, low cost, convenient monitoring, little influence on the environment and other advantages, in recent years has been widely used in Haikou, Sanya in the construction, many on the pile quality caused by this problem has attracted much attention. According to the construction experience of pile foundation engineering in recent years, the construction quality problem of pile foundation pile are not up to the design requirements of control; deviation of pile position and pile tilt rate exceed the standard; broken pile head; pile damage; single pile bearing capacity is not up to the design requirements. The author simply talks about the causes and Countermeasures of the pile failure in the construction of the tubular pile foundation. 1 the pile is not up to the design control requirement 1.1, the main reason why the pile fails to meet the design control requirements is that: 1.1.1 survey borehole density does not meet the requirements, the exploration report failed to provide accurate geological data; or the design selection of the bearing layer is improper or the design requirements are too high. When the 1.1.2 pile is sinking, the underground obstacle or the hard interlayer is thicker. 1.1.3 piling hammer is too small, or pile hammer is old, hammer free fall is not smoot