The previous articles have mentioned bolt construction technology, now come of what the anchor role in the construction of the concrete.
     1. The role of anchor suspension: solid prestressed anchor in the deep on the rock and soil to make a stable, rock and soil to overcome the weight and fall down, to prevent wall slip, collapse.
     2 extrusion Reinforcement: compressed with the loose bolt reinforcement through the formation, integrity enhanced carrying capacity.
     3 Bolt length: high-strength bolt according to the design, can effectively play its required role in the total length. Actual #118alues, you should also consider the excavation contour irregularities and increase the additional length.
     4 anchorage length: prestressed bolt anchor into stable strata in length, calculated according to experience select or choose.
     5 reinforcement length: according to the direction of the bolt along the height of the suspension of the dangerous rock, or rock to determine the load height.
     6 bolt Pull test: test tube slotted anchor bolt so the quality of construction, determination of anti-pull force bolt. Each volume of detection chamber 30 ─ 50 meters long each sample a set of bolts 300, each not less than three, should be the same cross-section of the checkpoint within a row of anchors in uniform selection.

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