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

Abstract

The invention provides a prestressed unbonded anchor rod steel bar. The prestressed unbonded anchor rod steel bar comprises a main steel bar body serving as a basic force bearing structure, the main steel bar body is a finish rolling steel bar or a common steel bar, an anti-corrosion grease layer is arranged on the surface of the main steel bar body, and a plastic film sleeve is arranged outside the anti-corrosion grease layer. The number of the main steel bar bodies is one or one to five, and the main steel bar body is of a main steel bar structure formed by connecting segmented reinforcing steel bars through connecting nuts. According to the prestressed anchor rod prepared from the unbonded anchor rod steel bars, the unbonded main steel bars are directly cast into the prestressed anchorrod through concrete, or the lower end of the prestressed anchor rod is connected with grouting bodies or concrete of expanded heads; the grouting body or concrete of the expanded head is internally wrapped with a steel reinforcement framework or a bag, wherein the steel reinforcement framework comprises one or more steel reinforcements, a steel reinforcement cage with a common structure and a variable-diameter steel reinforcement cage; an anti-floating tensile anchor rod of a concrete prefabricated pipe column is prepared when a steel reinforcement cage and a variable-diameter steel reinforcement cage of a common structure are adopted; one or more reinforcing steel bars are connected by using one or more reinforcing steel bar anchor rod reinforcing steel bars; and one or more reinforcingsteel 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. Anti-floating tensile steel anchors and their application technologies prepared with pre-tensioned or post-tensioned prestressed anti-floating and tensile unbonded steel bars, and combined with various anchor heads such as straight-through or enlarged heads to form a post-tensioned prestressed anchor system. To overcome the anti-floating deformation, the rod body can be elastically deformed in the free section, and relates to an anchor rod system and even a pressure-resistant 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 sav...

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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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