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一、SN型锚杆SN型锚杆系一种适用于多裂隙岩石、被钻孔破坏的岩石以及非均质的不良岩石的全长锚固砂浆锚杆。这种砂浆锚杆,系先往孔内注砂浆,然后再将锚杆插入。瑞典北部的Store Norfors水力发电站施工时首先采用此种锚杆。当将锚杆插入已注满砂浆的钻孔时,与锚杆等容积的砂浆被压入周围岩层,充填在裂隙与空洞里,并与钻孔时遭到破坏的孔壁粘结,和围岩构成整体。
First, the SN-type anchor SN-type anchor is a suitable multi-fracture rock, rock damaged by drilling and heterogeneous poor rock full-length anchor mortar anchor. This mortar anchor, the Department of mortar into the hole before the hole, and then insert the anchor. This type of anchor was first used in the construction of the Store Norfors hydroelectric power station in northern Sweden. When the anchor rod is inserted into a borehole filled with mortar, mortar of equal volume with the anchor rod is pressed into the surrounding rock formations, filled in cracks and voids, and bonded to the damaged walls of the borehole, The rock makes up the whole.