A kind of production and maintenance method of prestressed concrete hollow square pile

Abstract

The invention discloses a production and maintenance method for a prestressed spun concrete square pile. The production and maintenance method comprises the following steps: producing a reinforced cage; mounting the reinforced cage and performing mechanical material distribution; performing die assembly to realize the great improvement of concrete compaction and finally form a spun square pile; carrying out steam maintenance; pretreating raw materials in a centrifugal die, wherein the pretreatment step consists of a raw material pre-mixing pretreatment and raw material post-mixing pretreatment. According to the production and maintenance method for prestressed spun concrete square pile, the antiseptic performance of the spun square pile can be enhanced, so that the production and maintenance method is worthy of popularization and use in malloseismic regions and building foundations of highrise buildings and large-area basements.

Description

technical field [0001] The invention relates to a production and maintenance method of a prestressed concrete hollow square pile, belonging to the field of concrete prefabricated components. Background technique [0002] The prestressed square pile is a hollow cylindrical slender concrete prefabricated component made by pretensioning prestressing process and centrifugal forming method. It is mainly composed of square pile body, end plate and steel ferrule. The use of hollow square piles, because of its many advantages, will be accepted by the market and promoted. Japan, as the inventor of pipe piles, has been widely used since the 1960s. In recent years, the use of pipe piles has been decreasing year by year. In 2004, the number of pipe piles used nationwide was less than 5 million meters; Since the use of square piles has accounted for 40% of all pile types, the advantages of hollow square piles can be seen. The United States is also similar to Japan. In 2003, the use of ...

AI Technical Summary

Problems solved by technology

[0003] Immersed pipe piles, concrete prefabricated piles, bored piles, prestressed concrete pipe piles, etc. are widely used in the existing market. Among the above concentrated pile types, prestressed concrete pipe piles are prefabricated in factories, have high concrete strength, The advantages of convenient construction and fast cycle have been widely used, while immersed pipe grouting piles need to be produced on site, the quality is difficult to guarantee, and the environmental pollution is serious. They are not suitable for geology with thick soft soil layers, and are prone to necking. phenomenon, the construction period is very long, the advantages and disadvantages of prefabricated concrete square piles have been described, and will not be repeated, but one thing worth mentioning is 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. 1. At the same time, because it is solid and has a large self-weight, cracks in the pile body often appear during construction, which makes the durability of the pile poor; and through the combination of centrifugal and prestressing technology, plus internal hollow, the newly developed hollow Square piles completely overcome this disadvantage

[0004] Currently on the market, prestressed concrete pipe piles are relatively more used in industrial and civil buildings. It overcomes the shortcomings of the pile types used in the past and has its own characteristics, but the shortcomings are also obvious: the appearance is smooth and round, especially in When used as a friction pile, the friction with the soil is small, and many projects have to use pipe piles with large outer diameters or simply use solid square piles, which increases the project cost; the bending resistance of thin-walled pipe piles is poor , especially the poor shear resistance and tensile performance of the pile body, which has buried hidden dangers for the foundation of the building. Therefore, at the recent National Prestressed Concrete Pipe Pile Research Conference, it has been clearly stated that the shear resistance of pipe piles must be adjusted. , Tensile performance, and pipe piles are used cautiously in key projects. Therefore, the development of foundation pile materials with a polygonal or variable diameter appearance, and innovations such as improving the production process are the top priorities of development.