PHC pipe pile, the Chinese name is prestressed high-strength concrete pipe pile, PHC is the abbreviation of prestressed high-strength concrete. PHC pipe piles are usually made into hollow cylindrical concrete precast members by pre-tensioning centrifugal molding process and steam curing at 10 atmospheric pressure and 180℃.
Second, how to treat phc pipe pile model?
The model classification of phc pipe piles is related to their types:
1, according to the effective prestress value of pile concrete
It can be divided into type A, AB, B and C, and its prestress values are 4.0N/mm_, 6.0N/mm_, 8.0N/mm_, 10.0N/mm_, respectively. Among them, B-type pile has better performance in beating and bending, followed by AB-type pile and A-type pile. Generally speaking, which mode to choose depends on the land. Type A is suitable for soft soil and type AB is suitable for hard soil. If pipe piles are used for foundation pit support and retaining piles, at least AB type or B type should be used.
2, according to the outer diameter and wall thickness
Generally, the length of Phc pipe pile is about 7 ~ 15m. Its outer diameter and wall thickness are 300(70), 400(95), 500( 100), 500( 125), 600 (10) and 600 (/kloc-0) respectively. 800( 130)， 1000( 130)， 1200( 150)， 1300( 150)， 1400。 (Outer diameter of support, thickness of inner wall of support, unit: mm)
According to the standard, the model mark of phc pipe pile should include external diameter, prestress value model, wall thickness and length. For example, type B PHC pipe piles with external diameter of 1000mm, wall thickness of 130mm and length of 15m are labeled PHC1000 b130-65438.
What are the advantages of prestressed high-strength concrete pipe pile?
Prestressed high-strength concrete pipe pile is a kind of high-quality pipe pile, and the advantages of phc pipe pile mainly include:
1, high bearing capacity of single pile: PHC pipe pile has high concrete strength, which can be driven into dense sand layer and strongly weathered rock layer, and its bearing capacity is higher than that of immersed cast-in-place pile, bored cast-in-place pile and manual digging pile with the same diameter.
2. Wide application range: PHC pipe piles are widely used in all kinds of high-rise buildings below 60 stories and low-cap pile foundations of industrial and civil buildings, including railways, highways and bridges, ports, docks, water conservancy, municipal administration, buildings and large-scale equipment.
3. Reliable quality: PHC pipe piles are professionally standardized by the factory, and the bearing capacity, bending resistance and pullout resistance are guaranteed.
4. High cost performance: The unit bearing capacity cost of PHC pipe pile is one of the cheaper pile types. Because of its fast construction speed, high efficiency and short construction period, it can reduce labor costs and create higher economic benefits.