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(一)概述 在地下工程中,锚杆支护已成为加固围岩的主要措施,特别是用锚杆支护采场顶板可改善作业条件、降低矿石的贫化损失。在房柱法中,以往多用楔缝式或胀壳式锚杆护项,其施工复杂,安装时劳动强度大,又不安全;当受到爆破震动,部分松石脱落后,整根锚杆就完全报废。缝管式(即开缝式)锚杆因锚固力偏低(仅3～6吨),许用锚固力只有1.5～3吨,且受到安装的限制,故不适合采场护顶使用。
(I) Overview In underground engineering, rock bolt support has become the main measures to strengthen the surrounding rock, especially with the bolt support mining roof can improve working conditions and reduce ore depletion losses. In the method of house and column, in the past, more use of wedge seam or expansion shell bolt guard, the construction is complex, the installation of labor-intensive, but not safe; when subjected to blasting vibration, part of the loose rock, the entire root bolt completely scrapped. Because of the low anchor strength (only 3 ~ 6 tons), the seamed pipe (ie, slotted bolt) has an allowable anchoring force of only 1.5 to 3 tons and is limited by the installation. Therefore, it is not suitable for the roof protection.