Echelon pressurizing grouting anchor rod and construction method thereof

Abstract

The invention discloses an echelon pressurizing grouting anchor rod and a construction method thereof. The echelon pressurizing grouting anchor rod comprises a grouting anchor rod, wherein five layersof grouting holes are formed in the grouting anchor rod in the length direction of a rod body at equal intervals, the number of the layers of the grouting holes is one to five in sequence from the head to the tail of the grouting anchor rod, a first layer of rubber check rings are arranged on the inner wall of the grouting anchor rod in the direction from the position of the first layer of the grouting holes to the tail of the rod body of the grouting anchor rod at a half layer distance, four rubber check rings are arranged on the grouting anchor rod and are located on the rear part of the first layer of the rubber check rings in sequence, and the distance between every two adjacent rubber check rings is the same as that between every two adjacent grouting holes. The echelon pressurizinggrouting anchor rod has the advantages of simplicity, easiness and high efficiency in manufacturing, high utilization rate, high continuous cohesive force and high economy and applicability, the grouting area can be effectively enlarged, the grouting uniformity and compactness are enhanced, the grouting anchor rod can be tightly combined with surrounding soft soil, and the anchor rod can be prevented from falling off.

Description

technical field [0001] The invention relates to the technical field of step pressure grouting anchor rods, in particular to a step pressure grouting anchor rod and a construction method thereof. Background technique [0002] With the rapid development of the economy, high-rise buildings and urban underground projects continue to increase, resulting in a large number of deep foundation pit excavation and support projects, and there are large-scale soft soil strata in the developed coastal areas of my country, and the soil moisture content is high , Poor physical and mechanical properties, which makes anchoring technology more and more important; [0003] Most of the existing grouting anchors are formed by one-time grouting, and the anchors formed by one-time grouting have the problems of insufficient anchoring force and easy loosening in the later stage, and it is difficult to provide continuous anchoring force in soft soil, and the grouting used in current projects Most of t...

AI Technical Summary

Problems solved by technology

Through the multiple grouting holes connected to the grouting channel in the hollow grouting bolt body, the grouting liquid can be better combined with the surrounding rock and the anchoring force can be increased. Insufficient pressure can not make the injected grout penetrate into the surrounding rock better, and the anchoring effect is not optimal;

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