Mechanical expanding type anti-floating anchor and construction method thereof

Abstract

The invention discloses a mechanical expanding type anti-floating anchor and a construction method thereof and relates to the technical field of anti-floating anchors. The problems that potential quality and safety hazards are likely to be formed by an equal-diameter anti-floating anchor, and construction operation is complex are solved. According to the technical scheme, the mechanical expandingtype anti-floating anchor is characterized by comprising a hollow drill rod, an expanding drill bit and a drilling machine device; an anchor bar material and a grouting pipe can be arranged in the hollow drill rod, and the bottom end of the anchor bar material and the bottom end of the grouting pipe are fixedly connected with an anti-blocking plate; a rotating device fixedly connected with the hollow drill rod is arranged in the drilling machine device, and a telescopic device fixedly connected with the anchor bar material and the grouting pipe is arranged in the rotating device; and the expanding drill bit comprises a ring-shaped body connected with the hollow drill rod in a sleeving manner and expanding edge parts, multiple movable cavities are formed in the ring-shaped body in a circular manner, the expanding edge parts penetrate the movable cavities, then one ends of the expanding edge parts are hinged to the hollow drill rod, and the other ends of the expanding edge parts stretchout of the outer wall of the ring-shaped body. The mechanical expanding type anti-floating anchor and the construction method thereof have the effects that the input cost of anti-floating anchor construction is reduced, the uplift bearing capacity is improved, the construction quality is improved, and construction operation is convenient.

Description

technical field [0001] The invention relates to the technical field of anti-floating anchor rods, more specifically, it relates to a mechanical expansion type anti-floating anchor rod and a construction method thereof. Background technique [0002] Anti-floating anchor is a kind of anti-floating measures for underground structures in construction projects. It is a structural component set up to resist the upward displacement of buildings above it. It is related to the level of groundwater level and its changes, and is opposite to the force direction of compression piles. [0003] Due to the limitation of drilling equipment, the anti-floating anchors in conventional anti-floating projects generally have the same diameter of anchors within their length range, that is, equal-diameter anti-floating anchors, and equal-diameter anti-floating anchors have the following defects: [0004] 1. Due to the lack of overlying soil constraints in the surface foundation, the anchor bolt cons...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the lack of overlying soil constraints in the surface foundation, the anchor bolt construction loses side resistance after being disturbed by construction, so that the length of the anchor bolt must be increased by 500-1000mm in structural length compared with the design calculation length to make up for it, resulting in unnecessary engineering waste;

[0005] 2. According to the usual post-grouting process, the lower part of the anchoring body is often effective while the upper part is poor. It often fails to meet the design requirements due to structural quality defects of the anchoring body, resulting in quality and safety hazards;

[0006] 3. Due to the limited diameter of the anchor rod, the pull-out force formed in the soil layer is also limited. It is often necessary to increase the length of the anchor rod or increase the number of anchor rods, which will inevitably cause waste, especially when the required buoyancy resistance is small;

[0007] 4. The current expansion bolts usually use rotary sprayed cement soil or capsule bolts. During the expansion process, the drill bit needs to be replaced, which makes the operation of the expansion bolts complicated.

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