Construction method for overcoming deformation of anti-floating fixed diameter anchor head or expanded head anchor rod system

Abstract

The invention discloses a pressure bearing type fixed diameter anchor head or expanded head anchor rod prestress application method. Drilling is conducted to the design depth till rotary jet grouting or mechanical chambering construction can be developed, a pull rod of an anchor rod and a fixed diameter anchor head or an expanded head are placed, after the expanded head is arranged in place, the expanded head is expanded to the design size through an expanding mechanism, then, high-pressure grouting or concrete pouring is conducted, and pile forming is achieved in an expanded body section and a whole free section. Threaded steel bars to which prestress can be applied are adopted in the pull rod in the anchor rod, spiral stirrups and base bottom plate steel bars on a base are bundled, and collisions of the prestress steel bars are avoided in the bundling process. Lastly, a base concrete base bottom plate is poured by erecting a template.

Description

technical field [0001] The invention relates to a construction method of a fixed-diameter or enlarged-head bolt, in particular to an underground engineering application technology. It is a construction method to overcome the deformation of the anti-floating fixed diameter or enlarged head bolt system (including the elastic deformation of the free section of the rod body and the soil creep deformation of the enlarged head anchorage section), and also involves the pressure-bearing fixed diameter or enlarged head anchor bolt Stress method. Background technique [0002] The fixed diameter or enlarged head 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 development" advocated by the state. Compared with the general traditional crafts, it is more economical and environmentally friendly in solving basement anti-floating and foundation pit support; at the same time, it...

AI Technical Summary

Problems solved by technology

The main defect of this method of deformation control is that the prestress can only be applied after the base plate construction is completed and reaches the design strength, which will greatly delay the construction period. The degree of damage will adversely affect the waterproofing of the basement. At the same time, the requirement for the foundation pit precipitation will be longer, and the relative cost will increase more.

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