Mechanical agitation type body-expanding anti-floating anchor construction method

Abstract

The invention discloses a mechanical agitation type body-expanding anti-floating anchor construction method. The mechanical agitation type body-expanding anti-floating anchor construction method comprises the following steps that S1, a drilling machine is prepared; S2, a drill hole, with the designed length, of an ordinary straight hole section is drilled in a foundation through an ordinary-diameter drill bit at the front end of a drill rod; S3, the drill bit is expanded through a mechanical device used for adjusting the diameter of the drill bit till the diameter of the drill bit is equal to the diameter of a designed body expanding section; S6, an anchor material with a conical pressure-bearing plate mounted at the bottom, and a grouting pipe are placed in the hollow drill rod; S7, pressure is applied to the hollow drill rod, so that the anchor material and the grouting pipe are driven to go deep into the bottom of an anchor hole; and S9, when grout reaches the hole orifice and overflows, grouting is stopped. The mechanical agitation type body-expanding anti-floating anchor construction method has the following characteristics that since stirring and grouting are conducted at the same time, an anchor body is uniform and reliable; and the bearing behavior of an ordinary tension type anchor is improved through diameter changing, the pulling resistance is improved, raising dust is avoided when stirring is conducted in the hole for hole formation, the earth outward transportation amount or waste grout treatment amount is reduced, the use amount of grout is reduced, and the construction cost of anti-floating projects is reduced.

Description

technical field [0001] The invention relates to the technical field of anti-floating anchor rod construction, in particular to a mechanical stirring type expansion body anti-floating anchor rod construction method. Background technique [0002] When the burial depth of the building foundation is greater than the burial depth of the groundwater table, the building will be affected by the buoyancy of the groundwater and cause a floating phenomenon. In the prior art, anti-floating anchor rods with the same diameter and impossibly large pull-out force are often used to offset the vertical displacement of the building caused by buoyancy under the foundation floor. [0003] In the construction process of the existing anti-floating bolts with the same diameter, conventional drill bits are usually used to form holes in the soil layer by high-pressure air blowing, mud replacement and other slag discharge methods, and then install anti-floating bolts in the holes The ribs or aggregat...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing equal-diameter anti-floating bolt construction technology, to provide a simple construction process, mechanical agitation and expansion, no dust, energy saving and environmental protection, and can increase the anti-pull capacity of the bolt, save the amount of slurry, Construction method of mechanically agitated expanding body anti-floating anchor for reducing construction cost of anti-floating anchor and anti-floating engineering

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