Prestressed composite superimposed large-diameter tube pile and manufacturing method thereof

Abstract

The invention provides a prestressed composite superimposed large-diameter tube pile and a manufacturing method thereof. The tube pile is characterized in that tube sections adopt an ultra high performance fiber reinforced cementitious composite (UHPFRC) as a substrate; ultra high toughness cementitious composite (UHTCC) crack-control protective layers are arranged outside the UHPFRC; a steel plate hoop is arranged on the periphery of the top of the tube section at the top of the pile; a flange plate is arranged at the bottom end of the tube section at the bottom of the pile; spiral stirrups are arranged in tube walls and preserved ducts are arranged in the tube walls; the tube sections are spliced into a whole by tensioning longitudinal prestressed tendons passing through the preserved ducts; the preserved ducts are densely filled by injecting cement paste after the longitudinal prestressed tendons are tensioned; steel tube pile tips are connected with the flange plate of the tube section at the bottom of the pile by welding; and stiffening plates are arranged at the intersections of the steel tube pile tips and the flange plate. According to the invention, the ductility, impact toughness and durability of the tube pile are fully improved.

Description

technical field [0001] The invention belongs to the technical field of pile foundations of civil engineering, bridge engineering and port engineering, and in particular relates to composite material superimposed large-diameter pipe piles and a manufacturing method thereof. Background technique [0002] At present, prestressed concrete pipe piles are widely used in offshore foundation treatment due to their advantages of high strength, good durability, strong corrosion resistance, and high impermeability. However, its flexural bearing capacity is far lower than that of steel pipe piles, and the slope of the inclined pile is small, so it cannot bear large horizontal loads. Moreover, when the number of strikes is large, the pile body is prone to cracking and pile top damage. [0003] Prestressed UHPFRC pipe piles use ultra-high-performance fiber-modified cement-based composites (UHPFRC) instead of ordinary concrete as the matrix material. UHPFRC materials not only have high st...

AI Technical Summary

Problems solved by technology

However, in some special cases, the tensile strain at the tensioned edge may exceed the ultimate tensile strain of UHPFRC, and cracking will occur, and the crack width may even exceed the prestressed concrete specified in the "Code for Design of Concrete for Harbor Engineering" and "Code for Design of Concrete Durability". Crack width limit for pipe piles, which creates durability issues for piles

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