1: Performance comparison of various pile types
In the existing market, cast-in-place pipe sinking piles, precast concrete piles, bored cast-in-place piles and prestressed concrete pipe piles are widely used. Among the above pile types, prestressed concrete pipe piles are widely used due to the advantages of factory prefabrication, high concrete strength, convenient construction, and fast cycle, while cast-in-place pipe sinking piles are difficult to ensure their quality due to the need for on-site production, Due to serious environmental pollution, it is not suitable for geological conditions with thick soft soil layer, which is prone to necking, and the construction period is very long, so it has gradually been eliminated by the market. For example, the Guangdong Provincial Construction Commission has clearly stipulated that the use of immersed cast-in-place piles is not allowed, and the Zhejiang Provincial Department of Construction has also restricted the use of immersed cast-in-place piles. Bored cast-in-place pile has strong vitality because of its high bearing capacity and adaptability to complex geology. However, this pile type needs to deal with the mud pumped out during construction, which causes serious environmental pollution. It has been less used in urban construction at home and abroad, and its production cost is quite high, so it is relatively less used in general industrial and civil buildings. The advantages and disadvantages of precast concrete square piles have been described, which will not be repeated, but it is worth mentioning that its construction damage rate is very low, which is also one of the starting points for our development and production of prestressed hollow square piles; At the same time, because it is solid and has a large self weight, cracks often appear on the pile body during construction, resulting in poor durability of the pile; The newly developed hollow square pile has completely overcome this disadvantage by combining centrifugal and prestressed technology, plus internal hollow. In the market, prestressed concrete pipe piles are used more frequently in industrial and civil buildings. They overcome the shortcomings of the previous pile types and have their own characteristics, but the disadvantages are also obvious: the appearance is smooth and round, especially when used as friction piles, the friction force with soil is small, and many projects have to use pipe piles with large outer diameter or simply use solid square piles, Increased project cost; The bending resistance of thin-walled pipe piles is poor, especially the poor shear resistance and tensile resistance of the pile body, which has buried hidden dangers in the foundation of the building. Therefore, the information has been clearly sent out at the national prestressed concrete pipe pile research conference that the shear resistance and tensile resistance of pipe piles should be specified, and pipe piles should be carefully used in key projects, At the meeting, various experts demonstrated and looked forward to the pile type with square or polygonal external surface, hoping that China could move closer to the western developed countries and develop the foundation pile material with polygonal or variable diameter external surface. The prestressed concrete hollow square pile was developed for this purpose.
Pinghu Huafeng Cement Products Factory is a large enterprise engaged in cement products for a long time Cement brick The manufacturer specializes in producing cement pipes, U-grooves, square piles, cement piles, road bricks Cement grass planting brick 、 Cement tile Concrete square piles, solid square piles, cement sewer pipes, concrete cement pipes, curbstones, curbstones, and other cement products, welcome new and old customers to consult and negotiate! //www.jxhfslzp.com Service hotline: 130-9562-2833 (Manager Yu)
