Feed tube length anchoring bolt is a kind of new-style and reinforcement of surrounding rock bolting initiative,
It is part of a three-dimensional longitudinal seam of high strength steel open, when installed in a smaller than the pipe diameter drilling,
But immediately in the length of the radial stress on hole wall rock and prevent slide friction.
Add anchor plate inside the tray, thereby to stress state of surrounding rock in three layers, and achieve greatness.
In the surrounding rock blasting vibration anchor moved in such circumstances, the anchoring force increased obviously, when the rock evidently displacement,
Anchor bolting resistance, not lose its than inflation shell has better properties. The bolt

1 and main technical performances
(1) the initial anchoring force: 3-7 tons.
(2) penstock pulled off load: 8 ~ 10 tons.
(3) anchor pipe ruptured antioxidant capacity: 12-13 tons.
(4) than A3 steel corrosion resistance, high 20-30% for long-term use.