The rock bolt for superspeed hardening agent sandwich cement cartridge is a simple and valid rock bolt as a support.
超快硬夹心水泥卷锚杆是一种简单有效的支护锚杆。
Rock Bolt
英语例句库
Uncompacted location and grouting saturation degree in the zone of anchorage bar are the two main parameters for judging rock bolts quality.
摘要锚固体内不密实的位置和灌浆饱和度是评价锚杆质量的两个重要参数。
英语百科
Rock bolt
A rock bolt is a long anchor bolt, for stabilizing rock excavations, which may be used in tunnels or rock cuts. It transfers load from the unstable exterior, to the confined (and much stronger) interior of the rock mass.
Rock bolts were first used in mining starting in the 1890s, with systematic use documented at the St Joseph Lead Mine in the US in the 1920s. Rock bolts were applied to civil tunneling support in the US and in Australia, starting in the late 1940s. Rock bolts were used and further developed, starting in 1947, by Australian engineers who began experimenting with four metre long expanding anchor rock bolts while working on the Snowy Mountains Scheme.
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