Grouting type anchor rod suitable for soft soil dam and soft soil dam anchoring construction method

Abstract

The invention provides a grouting type anchor rod suitable for a soft soil dam and a soft soil dam anchoring construction method. A grouting pipe is mounted in a rod body in a penetrating manner, a steel strand is arranged outside the pipe, one end of the steel strand is fixedly connected with an anchor head, and the other end is fixed at the rear end of the rod body through an anchorage device; an expansion piece structure is adopted at the front end of the rod body, and the anchor head and the expansion piece structure are matched through guiding limit slots and rib plates to transmit torque; an anchoring hole diameter expanding mechanism and a rod body automatic centering mechanism are arranged on the rod body. The method comprises steps as follows: a steel-plastic grating is laid, a drilling machine is erected, the anchor rod is mounted, the drilling machine is started clockwise, the anchor head drills in the dam in advance, the anchoring hole diameter expanding mechanism drills inthe dam successively and performs first-stage hole expanding, when the ratio of the drilling depth to the length of the anchor rod reaches a set value, the drilling machine is adjusted to rotate anticlockwise, the anchoring hole diameter expanding mechanism performs second-stage hole expanding until the anchor rod reaches the set drilling depth, the drilling machine is shut down, an anchoring hole is in a variable-diameter stepped hole state, an expansion piece is enabled to be expanded by drawing the steel strand, and grouting work is implemented until slurry reaches designed strength.

Description

technical field [0001] The invention belongs to the technical field of safety support, and in particular relates to a grouting anchor rod suitable for soft soil dams and a soft soil dam anchorage construction method. Background technique [0002] At present, the stability of the soft soil dam is usually guaranteed by tamping, and in order to further improve the stability of the soft soil dam, anchor rods or anchor cables will be installed in the soft soil dam. However, after the traditional anchor rod or anchor cable is applied to the soft soil dam, the anchoring effect is not ideal, because the dam body of the soft soil dam is mainly composed of soft soil, and the anchor holes are all cylindrical holes with equal diameters. The bonding force between the anchoring agent and the anchoring hole is easily weakened by external disturbances, resulting in a significant decrease in the anchoring strength of the traditional anchor rod or anchor cable, and it is impossible to further...

AI Technical Summary

Problems solved by technology

However, after the traditional anchor rod or anchor cable is applied to the soft soil dam, the anchoring effect is not ideal, because the dam body of the soft soil dam is mainly composed of soft soil, and the anchor holes are all cylindrical holes with equal diameters. The bonding force between the anchoring agent and the anchoring hole is easily weakened by external disturbances, resulting in a significant decrease in the anchoring strength of the traditional anchor rod or anchor cable, and it is impossible to further improve the stability of the soft soil dam

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