Views: 2 Author: Site Editor Publish Time: 2021-12-01 Origin: Site
Classification of steel pipe piles
Steel pipe piles are divided into post-tensioned pre-stressed pipe piles and pre-tensioned pre-stressed pipe piles, pre-stressed concrete pipe piles (PC pipe piles), and pre-stressed concrete thin-walled pipe piles (PTC pipe piles), and high-strength pre-stressed concrete pipes. Pile (PHC pipe pile).
The pre-tensioned prestressed pipe pile is a hollow cylindrical slender concrete prefabricated component made by the pretensioning process and the centrifugal forming method. It is mainly composed of a cylindrical pile body, an endplate, and a steel hoop.
Steel pipe piles are divided into pre-stressed concrete pipe piles (PC pipe piles), pre-stressed concrete thin-wall pipe piles (PTC pipe piles), and pre-stressed high-strength concrete pipe piles (PHC pipe piles) according to concrete strength grade and wall thickness. The concrete strength of the PC pile shall not be lower than C50 concrete, the strength grade of the PTC pipe pile shall not be lower than C60, and the concrete strength grade of the PHC pile shall not be lower than C80. PC piles and PTC piles are generally cured by atmospheric steam, and it usually takes 28 days to be driven. For PHC piles, after demolding, they must be steamed in an autoclave. After autoclave curing at 10 atmospheres and 180 degrees, the shortest time from forming to use for concrete strength grade C80 is only three or four days.