Pretensioned prestressing pipe pile construction method under weak expansion soil condition

The invention discloses a pretensioning prestressed pipe pile construction method under the condition of weak expansive soil and the characteristics of prestressed pipe pile engineering construction. Considering all processes such as pipe pile design, equipment selection, construction management and quality monitoring, we adopt measures such as canceling pile tip, taking out soil by through holes, dynamic monitoring, holo-authentic pile testing, rain protection and waterlogging drainage, bottom sealing, retapping, separate piling, etc. and carry out two types of work, namely, prevention and correction, so as to reduce the extent of damage of compaction effect to the scope allowable by design and standards during the process of prestressed pipe pile construction under the condition of expansive soil. The construction method is applicable to the industrial and civil architecture prestressed pipe pile foundation treatment and construction which have lower requirements on noise in suburban, villages and towns and