Construction method of prestressed anchor cable

Abstract

The invention discloses a construction method of a prestressed anchor cable, which comprises the steps of drilling anchor cable holes, fabricating the anchor cable, mounting the anchor cable, erecting an anchor pier, injecting slurry in the anchor cable holes and tensioning the anchor cable according to a design requirement, wherein in the step of fabricating the anchor cable, an inner anchoring section is fabricated into a ripple shape by wire bunching rings and isolating frames that are alternately mounted on steel strands at intervals; a tensioning section is fabricated into a straight-line shape by the isolating frames mounted on the steel strands at intervals; sleeves are mounted on the steel strands of the tensioning section in a sleeving manner; the lower end parts of the sleeves, which are located at a slurry stopping ring, are sealed by structural adhesives; in the step of injecting the slurry in the anchor cable holes, the slurry is injected in the tensioning section anchor cable hole by a tensioning section slurry injection pipe; after the sand slurry is solidified, the slurry is injected in the inner anchoring section anchor cable hole by an inner anchoring section slurry injection pipe; and after the slurry injection of the inner anchoring section is accomplished, the step of tensioning the anchor cable is conducted. The construction method has the advantages that the tensioning section accomplishing the slurry injection serves as the slurry stopping ring for the slurry injection of the inner anchoring section, and a slurry stopping effect can be ensured under any rock mass conditions, so that the quality of the whole anchor cable is ensured.

Description

technical field [0001] The invention relates to a prestressed anchor cable used for rock mass reinforcement, in particular to a prestressed anchor cable construction method. Background technique [0002] The prestressed anchor cable used for rock mass reinforcement generally adopts the secondary grouting type, and the inner anchorage section and the tension section are separated by a grout stop ring. During anchor cable construction, the first grouting is carried out to the inner anchor section to form a complete inner anchor section, then the anchor cable is tensioned, and finally the tension section is grouted for the second time. Because there is often a gap between the grout stop ring and the hole wall of the anchor cable hole, the grout stop effect is poor, not only the length of the tension section is difficult to ensure, but also the grouting pressure of the inner anchor section is not easy to guarantee, resulting in the effect of prestressing the anchor cable poor. ...

AI Technical Summary

Problems solved by technology

Because there is often a gap between the grout stop ring and the hole wall of the anchor cable hole, the grout stop effect is poor, not only the length of the tension section is difficult to ensure, but also the grouting pressure of the inner anchor section is not easy to guarantee, resulting in the effect of prestressing the anchor cable poor

In the case of poor geological conditions, even if some proprietary technology is adopted, it is still difficult to fully guarantee the grouting quality and prestressing effect of the inner anchorage section because the length of the grout stop section is only about 400mm

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