Prestressed unbonded anchor rod reinforcing steel bar, anchor rod and construction method

Abstract

The invention discloses a prestressed unbonded anchor rod reinforcing steel bar. The prestressed unbonded anchor rod reinforcing steel bar comprises a main reinforcing steel bar serving as a basic bearing structure, the main reinforcing steel bar is a finish rolling unbonded reinforcing steel bar, an anti-corrosion grease layer is arranged on the surface of the main reinforcing steel bar, and a plastic film sleeve is arranged outside the anti-corrosion grease layer. A prepared pre-stressed anchor rod is characterized in that a connecting structure at the lower end of an anti-floating tensile anchor rod of a concrete prefabricated pipe column is grouting body or concrete with an expanded head, and the grouting body or concrete with the expanded head is internally wrapped with a steel reinforcement framework or a bag; the steel reinforcement framework comprises one or more reinforcing steel bars, a steel reinforcement cage with a common structure and a variable-diameter steel reinforcement cage, when the steel reinforcement cage with the common structure and a variable-diameter steel reinforcement cage are adopted, the lower ends of anti-floating tensile anchor rod steel bars of a concrete prefabricated pipe column are connected with main reinforcements of the steel reinforcement cage or the variable-diameter steel reinforcement cage, and one or more steel bar anchor rod steel bars are used for being connected with one or more steel bars; and one or more reinforcing steel bars or reinforcement cages are still arranged in the center of the bag.

Description

technical field [0001] The invention relates to a novel prestressed anchor rod, in particular to a pre-tensioned or post-tensioned anti-floating and tensile anchor rod and its construction method. The prepared anti-floating and tensile steel anchor can use the post-tensioning method to prefabricate the prestressed anchor rod and its application technology, and use various anchor heads such as straight-through or enlarged heads to form a post-tensioned prestressed anchor system to overcome the anti-floating. Deformation, rod body can be elastically deformed in the free section, involving an anchor rod system and even a compression pile system that overcomes the anti-floating straight-through or enlarged headband to apply prestress. Background technique [0002] The straight-through or enlarged head prestressed bolt technology is a new type of underground engineering application technology, which is in line with the spirit of "energy saving, emission reduction, and green devel...

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Problems solved by technology

[0015] The applicant is prior: CN2017103638836 a prefabricated prestressed anchor rod and its construction method; CN2017103638836 a construction method for overcoming the deformation of the anti-floating fixed diameter anchor head or expansion head anchor rod system, but there are still improvements in the prestressed anchor rod place

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