Expanded head capsule type anchor rod and construction method thereof

Abstract

The invention discloses an expanded head capsule type anchor rod. The anchor rod comprises a finish rolled threaded reinforcing bar, a capsule type squeezing and expansion body and a bushing, wherein the finish rolled threaded reinforcing bar extends into the capsule type squeezing and expansion body; a grouting material seal bottom is arranged at the bottom in the capsule type squeezing and expansion body; a stop-grouting plug is arranged at an inlet of the capsule type squeezing and expansion body; a backing plate fixedly sleeves the upper part of the finish rolled threaded reinforcing bar; a pre-stressed nut sleeves the finish rolled threaded reinforcing bar; a conical iron hat with a reserved hole is fixedly arranged on the top surface of the backing plate and covers the finish rolled threaded reinforcing bar sleeved by the pre-stressed nut. The invention also discloses a construction method of the expanded head capsule type anchor rod. The method comprises the following steps: drilling and forming a hole; performing high-pressure rotary spray grouting to perform expanding construction; placing the expanded head capsule type anchor rod; grouting cement mortar into a pocket; supplementing the mortar; tensioning and locking. The expanded head capsule type anchor rod and the construction method have the beneficial effect that the conventional anchor rod which is widely used at present can be partially substituted at wider areas and in engineering projects.

Description

Technical field [0001] The invention relates to an enlarged head capsule type anchor rod and a construction method thereof. Background technique [0002] As land prices continue to rise and the number of cars soars, cities are developing underground spaces on a large scale. Underground buildings have reached multiple floors, and the safety of underground engineering is becoming more and more important. Traditional anchor rods have been widely used in water conservancy and hydropower, industrial and civil construction, transportation and municipal engineering. Because they are tensile anchor rods, especially when applied in soil, there is a cement protective layer that is easy to crack after being stressed. The steel bars are corroded and anchored. Problems such as low force and difficult quality control. [0003] At present, most of the domestic anti-floating foundations of buildings are: 1) anti-floating reinforced concrete cast-in-place piles; 2) anti-floating anchors (tension ...

AI Technical Summary

Problems solved by technology

Among them, the anti-floating pile is a conventional practice with mature technology and experience to follow. However, since the material uses steel cage + concrete, the investment is relatively large, and the tensile performance of concrete is poor.

The anti-floating anchor (tension type) usually provides a small pull-out force. For projects with high anti-floating design bearing capacity, the traditional anchor can no longer effectively meet the needs of engineering construction, and the grouting body at the fixed end is prone to tension. Pull cracks, poor anti-corrosion performance

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