Bit-expanded anchor rope construction method by using mechanical hole expansion

Abstract

The invention discloses a bit-expanded anchor rope construction method. The method comprises the steps of drilling, hole expansion, deslagging, grouting and anchor rope installation, wherein the hole expansion is performed by a mechanical hole expanding drill bit; the deslagging is conducted after hole expansion, specifically compressed air is added in a drill rod through a four-way mixing valve connected with the drill rod for blowing, and after water is added for stirring, the compressed air is added again for blowing; and according to the grouting step, cement slurry is injected to the bottom of an anchor hole from the drill rod through the four-way mixing valve connected with the drill rod for stirring to form cement soil with remained slurry. The hole expanding method can form a bottom expanding straight section to meet the end expanding requirements; the deslagging method can effectively remove the slurry in the anchor hole and effectively prevent hole collapse; according to the method, stirring is conducted after grouting, the remained slurry and the cement slurry form high-strength cement soil, the strength of an anchored body is guaranteed; and the anchor rope is in middle of the end expanding section to prevent eccentric compression of the anchor rope on the expanding section.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, in particular to the technical field of anchor cable construction in construction engineering, and particularly relates to an anchor cable construction method using mechanical reaming and enlarging heads. Background technique [0002] Due to the high bearing capacity, small deformation and high reliability, the enlarged head anchor cable has great advantages compared with the traditional anchor cable, so it has been widely used in foundation pit support. The pullout force of the anchor cable of the enlarged head is mainly composed of two parts, one part is the lateral resistance between the anchorage section and the contact soil, including the ordinary anchorage section of the anchor cable and the enlarged head section; The end resistance, this special form of force effectively improves the pullout resistance of the anchor cable. [0003] At present, the expansion head anchor ca...

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Problems solved by technology

[0005] However, the anchor cable construction of the mechanical reaming expansion head also has defects. The diameter and length of the reaming section are not easy to guarantee. The slag in the reaming section is not easy to clean. Unevenness affects the pullout resistance of the anchor cable. After the anchor cable enters the expansion section, due to the larger diameter of the expansion section, the anchor cable is close to the bottom of the hole. Section eccentric compression affects the anchoring force

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