Convenient and rapid pressure grouting method adopting anchor rod

Abstract

The invention relates to a convenient and rapid pressure grouting method adopting an anchor rod, and belongs to the technical field of foundation engineering. The method comprises the steps that 1, drilling is carried out in a preset position; 2, a primary grouting pipe, a secondary grouting pipe, an exhaust pipe and the anchor rod are wrapped tightly with a woven bag and are inserted into a drilling hole, wherein the distance between the top of the woven bag and the drilling hole is 2.0-3.0 m, the distance between the bottoms of the primary grouting pipe and the secondary grouting pipe and the bottom of the drilling hole is 150-250 mm, and in the length of a anchorage section, a plurality of slurry outlets are formed in the side wall of the secondary grouting pipe, and the opening end atthe bottom of the secondary grouting pipe and the slurry outlets are sealed through adhesive tape; 3, the diameter of the tightly-wrapped woven bag is the same as the diameter of the drilling hole; 4,hole sealing is carried out; 5, primary grouting is carried out; and 6, secondary high-pressure grouting is carried out. According to the convenient and rapid pressure grouting method adopting the anchor rod, effecting grouting and reinforcement of backfilling soil, loose soil and soft clay bodies can be ensured to be realized through the anchor rod, and the anti-pulling force of the anchor rod can be guaranteed. The method has the advantages that waste can be reutilized, general adaptability is achieved, the manufacturing cost is low and the construction is simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of bolt support, and in particular relates to a convenient method for bolt pressure grouting, which is used for backfilling, grouting of loose soil and soft clay bodies. Background technique [0002] In the process of underground engineering, mining engineering, foundation pit and side slope engineering involved in geotechnical engineering, in order to prevent the stratum from being deformed, collapsed or unstable, a main support technology for strengthening the stratum is bolt grouting. In order to prevent the slurry from overflowing from the borehole during grouting, a sealing sleeve (commonly known as grouting plug) is often placed on the orifice of the bolt. The existing sealing sleeves are all rubber sleeves. This rubber sleeve has the following disadvantages: (1) The unit price is expensive; (2) The structure is complex and the installation operation is cumbersome; (3) The rubber is easy to react with ...

AI Technical Summary

Problems solved by technology

The existing sealing sleeves are in the form of rubber sleeves, which have the following disadvantages: (1) the unit price is expensive; (2) the structure is complicated, and the installation operation is cumbersome; (3) the rubber is easy to react when it encounters chemical materials, and it is easy to age when stored , which affects its use; (4) The surface of the rubber sleeve is very smooth, and the friction with the hole wall is low. Under the strong grouting pressure, the rubber sleeve is easy to burst out, and the slurry splashes, which affects production safety.

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