A prestressed high-strength concrete square pile and its manufacturing method

Abstract

The invention discloses a prestress high-strength concrete square pile and a manufacturing method thereof. The square pile is characterized in that the concrete square pile and an end plate have square appearances, four side corners are in a stress-relief arc shape, one pair of arc angles of the arc shape is 90 degrees, the arc radius is 18 mm, the other pair of arc angles is 90 degrees, and the arc radius is 13 mm. According to the manufacturing method, centrifugation rotating forming is divided into three stages, namely a low-speed centrifugation stage, a high-speed centrifugation stage and an ultra-low-speed centrifugation stage. According to the prestress high-strength concrete square pile, by setting the arc angles and the radiuses, the finished pile cannot be damaged easily during building construction hammering, and the product pile-forming rate can reach 99.5%-99.8%. According to the manufacturing method of the pile, centrifugation forming on a centrifugal machine is divided into the three stages, so that the compactness of concrete is improved, the bearing force, the ductility, the bending resistance and the shearing resistance of a centrifugation pile are improved, the bearing force is improved by 25%-30%, the ductility is improved by 15%-30%, and the bending resistance and the shearing resistance are improved by 10%-15%.

Description

technical field [0001] The invention relates to a prestressed high-strength concrete square pile, and also relates to a manufacturing method of the prestressed high-strength concrete square pile, which belongs to the construction field. Background technique [0002] In civil construction engineering, it is often necessary to use reinforced concrete as the foundation pile, which is pressed into the ground with a pile driver to become a foundation pile, so that the upper part of the foundation pile can bear the building, especially on a foundation with a complex geological structure. For high-rise buildings, the use of foundation piles to strengthen the foundation is an indispensable means at present. At present, foundation piles can be divided into hollow piles and solid piles according to their structures, prefabricated piles and cast-in-place piles according to production methods, ordinary steel bars and stress steel bars according to steel materials, and artificial forming...

AI Technical Summary

Problems solved by technology

[0003] There are many kinds of prestressed concrete solid square piles and their manufacturing methods in the prior art, such as a kind of steel pile tip full prestressed concrete whole root solid square pile and its processing method, when the pile body is made, the hoops are first made , and then penetrate the prestressed main reinforcement, and finally bind the stirrup and the prestressed main reinforcement at the junction, not only the processing is troublesome and the efficiency is low, but also it is difficult to ensure that the stirrup and the prestressed main reinforcement fit together

In addition, because the reinforcement cage adopts the binding process, according to the design requirements, the diameter of the prestressed main reinforcement of the reinforcement cage must be more than 20% larger than that of the prestressed reinforcement of the reinforcement cage using the welding process, and the amount of prestressed reinforcement of the reinforcement cage is large. Many consumables greatly increase the manufacturing cost

There is also a prestressed concrete solid square pile and its manufacturing method, which adopts a plurality of reinforcement cages. In the actual production process, when the prestressed main reinforcement is more than 12, the production process is cumbersome and difficult to control.

In addition, multiple reinforcement cages cannot be used to place the pile tips at one time.

If the pile tip is required, it needs to be connected to the pile body separately, which is both troublesome and affects the overall strength of the pile body

[0004] In the above two methods, the process of connecting the pile body and the cap is complicated and the cost is high

In addition, the application of the above two methods will also be limited in hydrogeological conditions with high corrosion resistance requirements such as saline-alkali land in coastal areas.

More importantly, the strength of the prestressed concrete solid square pile produced is not strong enough to meet the construction needs of the construction industry