Non-pre-stress high-strength centrifugal concrete square pile

Abstract

The invention provides a non-pre-stress high-strength centrifugal concrete square pile. The square pile comprises a concrete pile body and end plates at the two ends, wherein the concrete pile body is internally provided with a steel bar cage framework; the steel bar cage framework comprises a plurality of non-pre-stress main bars and spiral hoop bars; the non-pre-stress main bars are uniformly distributed in a longitudinal direction; the spiral hoop bars are automatically and fixedly connected to the non-pre-stress main bars; the two ends of the non-pre-stress main bars are respectively and fixedly connected into end plate holes of the end plates at the two ends; one part, which is 0.207L far away from the two pile ends, of the concrete pile body is provided with two hoisting points for transporting and hoisting. The non-pre-stress high-strength centrifugal concrete square pile has the beneficial effects that the non-pre-stress high-strength centrifugal concrete square pile adopts a mechanical assembly line machining process so that the production efficiency is improved. The damages to the pile body are effectively reduced and the ductility of the pile body is improved by more than 30%; a phenomenon that the pile body is cracked is avoided and the whole performance of the square pile is improved by more than 20%; the process is simple, the cost is low and the performance cost ratio is high; the non-pre-stress high-strength centrifugal concrete square pile is a centrifugal concrete pile with high vertical bearing capacity, high horizontal bearing capability of a pile foundation and capability of meeting seismic requirements, and can be applied to foundation construction of various soil textures.

Description

technical field [0001] The invention relates to foundation construction technology in civil engineering, in particular to a non-prestressed high-strength centrifugal concrete square pile. Background technique [0002] Concrete is a typical brittle material with a high modulus of elasticity, and its compressive strength has no linear correspondence with its tensile strength. With the in-depth study of prestressed concrete pipe piles and square piles in recent years, there are different views on their horizontal bearing capacity and the durability of pressure steaming technology, especially the horizontal bearing capacity of prestressed concrete pipe pile foundations. Therefore, the national According to some provincial standards or atlases, the application range of prestressed concrete pipe piles is non-seismic areas and areas with seismic fortification crack degree 6 and 7 degrees. If it is used in areas with seismic fortification crack degree 8 degrees, it needs Check and ...

AI Technical Summary

Problems solved by technology

[0003] In the current production process of prestressed piles, there are problems of poor bending resistance, brittle failure and poor ductility. There are prestressed centrifugal square piles that crack and develop rapidly, and the steel bars in the tension zone quickly enter yield and neck until they break. There is little difference between the ultimate bending moment and the cracking moment

Although it can be prefabricated in the factory, prestressed steel rods and pretensioning technology are generally used due to the weight of the square pile. These phenomena lead to high brittleness and poor ductility of square piles, and are prone to quality accidents such as broken piles and brittle fractures.

However, due to the limitation of concrete strength, the penetration of ordinary square piles is limited, and the processing of steel skeletons is all manual operations, which increases production costs and reduces production efficiency.

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