Connect the drill pipe joint with the drill bit, adopt the mud wall protection method, drill holes while grouting, and treat with thick cement slurry after the free end is completed.
3. Upper waist beam
I-beams are used to connect anchor cables.
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After the slurry is solidified, it is tensioned two days later.
5. External protection
After hole sealing and grouting, leave 50mm steel strand from the anchorage, cut off the rest, and paint a protective layer of cement mortar with a thickness of not less than 50mm outside.
Professor Hui Xingtian of Xi 'an University of Science and Technology specializes in anchor cable technology and holds many invention patents. The self-drilling anchor cable invented in 2009 adopts the new patented technology of drilling and grouting to complete the construction at one time, which is 2-5 times faster than the traditional anchor cable construction and reduces the construction cost by 20%.
Expert comment: the new technology of self-drilling anchor cable can adapt to F.