Prestressed concrete pipe piles (hereinafter referred to as prestressed pipe piles or pipe piles) can be divided into post-tensioned prestressed pipe piles and pretensioned prestressed pipe piles.
Pre-tensioned prestressed pipe pile is a hollow cylindrical slender concrete precast member made by pre-tensioned prestress technology and centrifugal forming method, which is mainly composed of cylindrical pile body, end plate and steel hoop.
Grade and wall thickness
According to concrete strength grade and wall thickness, pipe piles are divided into prestressed concrete pipe piles, prestressed high-strength concrete pipe piles (code PC) and prestressed high-strength concrete pipe piles (code PHC). PTC codes the concrete strength of thin-walled pipe piles. The strength grade of PC pile concrete is not less than C50, thin-walled pipe pile concrete is not less than C60, and PHC pile concrete is not less than C80.
Bottom pressure steam curing
PCS piles and PTC piles are generally cured by atmospheric steam, which takes 28 days to finish. After demoulding, PHC piles need to be autoclaved at 10 atmospheric pressure and 180 degrees. It only takes three or four days for the concrete strength grade to reach C80.
example
Type A prestressed high-strength concrete pipe pile, with an outer diameter of 600 mm, a wall thickness of 105 mm and a length of 12 m, with the label PHC-A600- 105- 12. In the past, the joints of pipe piles were all connected by flange bolts, but now almost all of them are connected by end plate welding. The end plate is a circular iron plate at the top of the pipe pile, and the thickness is generally 18-22 mm, and the outer edge of the end plate is provided with grooves along the circumference. After the pipe piles are butted, the groove becomes U-shaped, and the U-shaped groove around the pipe piles can be filled during welding. The first prestressed pipe pile sunk into the soil is called bottom pile. The pile end (shoe) should be set at the lower end of the bottom pile.
Pile tip (pile shoe) form of pipe pile
Cross, cone and open. Cross type and cone type are also called closed type.
The above is the introduction of precast pipe pile construction technology provided by Zhong Da Consulting for builders. For more knowledge of architectural terminology, please pay attention to the architectural knowledge column of Zhong Da Consulting.
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