High-performance low-prestressed concrete hollow square pile

Abstract

The invention discloses a high-performance low-prestressed concrete hollow square pile. The high-performance low-prestressed concrete hollow square pile is characterized in that a pile body is composed of at least one unit pile; each unit pile is composed of concrete and parallel reinforcing steel bars tensioned with the prestress of 0.3-0.6 [sigma] in the concrete; the two ends of the reinforcing steel bars are connected with connection plates respectively; the adjacent unit piles are welded through the connection plates to form the pile body; the outer layers of the two connected connection plates are coated with fiber resin with the thickness not smaller than 1.5 mm; the fiber resin layers are wrapped with carbon fiber cloth capable of improving the antiseptic ability and tension resistance. The high-performance low-prestressed concrete hollow square pile has the advantages of being high in corrosion resistance, large in bearing force, low in production cost, high in durability and the like, the problem of the piling illusion is effectively solved, the integrity of the pile body is ensured during construction, the bearing force of the pile body is effectively improved, the weight is lower, cracks caused by mutual collision in the production and transportation process can be avoided, and the phenomena of pile breakage, pile body concrete falling and the like are also not prone to occurring in the site construction.

Description

technical field [0001] The invention relates to the foundation of buildings, in particular to a high-performance low-prestressed concrete hollow square pile with convenient construction, long service life and good anti-seismic effect. Background technique [0002] As we all know, piles are the foundation of buildings, and the stability of buildings first requires reliable pile foundations. For this reason, "Technical Specifications for Building Pile Foundations" (JGJ94-2008) specifically puts forward technical requirements for concrete piles. At present, prestressed concrete solid square piles are generally used in construction. For example, the patent number is 2012100044922, and the patent name is "prestressed concrete solid square piles and its manufacturing method". It contains steel cages, concrete, and steel cages. It is welded or bound by at least two single-body reinforcement cages welded by sliding welding method. The two ends of the pile body are provided with meta...

AI Technical Summary

Problems solved by technology

At present, prestressed concrete solid square piles are generally used in construction. For example, the patent number is 2012100044922, and the patent name is "prestressed concrete solid square piles and its manufacturing method". It contains steel cages, concrete, and steel cages. It is welded or bound by at least two single-body reinforcement cages welded by sliding welding method. The two ends of the pile body are provided with metal end plates connected with the reinforcement cages. The stirrups of the reinforcement cages are welded on the main reinforcement in a spiral shape. , the main reinforcement of the reinforcement cage is made of high-prestressed steel rods for prestressed concrete piles, and its prestress is 0.7-0.9 [σ] tensioned, and its strength meets the requirement of greater than 1420 N per square millimeter. Since each reinforcement cage is welded by sliding welding As a result, the structural strength of the steel cage itself is greatly improved, the strength loss of the solder joints is less than or equal to 5%, and the diameter of the prestressed main reinforcement of the steel cage is reduced by 20%. Unreasonable, because the main function of the pile is to bear the load of the building, but this kind of high prestressed concrete solid square pile is made of high prestressed steel rods. If the lateral force is generated during use, the deformation of the pile is too large, which will affect the construction of the building. Second, there are no protective measures for the connection between piles, and the anti-corrosion performance is poor; third, ordinary concrete is used, which has poor crack resistance, which affects the durability of prefabricated piles. Due to cracks, the atmosphere or corrosive medium is easy to Chemically react with steel bars and concrete, reducing the safety of the pile body, especially when used in highly corrosive environments such as oceans and saline-alkali soils, it will accelerate the reduction of the service life of buildings

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