Construction Method of Prestressed Anchor Cable Grouting and Anchor in Cracked Rock and Soil Strata

Abstract

The invention discloses a grouting and anchoring construction method for prestressed anchor cables in cracked rock soil strata. A plurality of prestressed anchor cables all arranged on the same plane are used to reinforce the slope to be reinforced. The steps include: 1. The degree of development of rock mass joints and fissures is determined; 2. The length of the anchorage section and the position of the anchor cable hole are determined; the prestressed anchor cable includes the anchor cable body, the primary grouting pipe and the secondary grouting pipe. The anchor cable body includes multiple steel strands; 3. Prestressed anchor cable grouting and anchoring construction: when performing grouting and anchoring construction on any prestressed anchor cable, it includes steps: drilling, laying anchor cables, normal pressure injection Grouting, high-pressure grouting and cable tensioning and anchor sealing. The method of the invention has simple steps, reasonable design, convenient construction, high construction efficiency and good application effect, and can simply and quickly complete the reinforcement process of the slope to be reinforced. The prestressed anchor cable used has low cost and high anchoring force, and can Reinforce the slope for effective reinforcement.

Description

technical field [0001] The invention belongs to the technical field of rock and soil stratum reinforcement construction, and in particular relates to a grouting and anchoring construction method for prestressed anchor cables in rock and soil strata containing fissures. Background technique [0002] Cracked rock and soil strata refer to rock and soil strata with fissures, and fissures refer to rock joint fissures. Therefore, fissure-containing rock and soil strata mainly refer to fissure rock strata, such as karst fissure strata and weathered rock strata. For rock and soil formations, two grouting methods, the "mortar pump sealing grouting method" and the "secondary splitting grouting method", are currently used for reinforcement. Among them, the "mortar pump sealing and grouting method" refers to the installation of a grouting pipe for the hole after sealing the hole of the anchor cable with quick-setting cement. Connection, the orifice grouting pipe is a steel pipe and its...

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Problems solved by technology

In actual construction, the above two reinforcement methods can effectively squeeze out water and air and have the advantages of rust resistance and durability, but the scope of application is narrow, and they are only suitable for soft rock or soil formations, and the above two reinforcement methods have the following five Insufficient aspects: ① Did not check complex geological conditions and find out the development of fractures in strata at different stages; ② Cannot completely remove the water and sand in the cave; Pressure grouting, the second splitting grouting can not achieve the fullness of the grout, can not effectively fill the rock-soil cracks and rock seepage gaps, and the grouting anti-leakage effect is poor; ④ There is no reasonable grouting for each anchor cable, so the construction is difficult , the construction progress is slow, the cost is high, and there is a lot of waste; ⑤The pull-out test of the anchor cable cannot reach the maximum load value and bearing capacity, and the project quality cannot be guaranteed, the anchoring quality is poor, and the cost is high

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