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我国的煤及半煤巷道掘进中,大都采用传统的架棚支护。近年来,锚杆支护得到逐步推广,其优点是加快了施工进度,降低了支护成本,能快速有效地支护顶板,且支护强度大。但锚杆支护也有其局限性,例如在大跨度的交岔点、硐室和断层破碎带,锚杆支护就不足以维护工程稳定。预应力锚索技术能提供较大的承载力,作用范围更大,是特殊地区工程支护的有效支护方法。过去的预应力锚索锚固技术多用于岩巷中,一般采用孔径φ90mm,预加应力300kN,极限承载力600kN,支护效果良好,把该技术
In China’s coal and semi-roadway tunneling, most of the traditional shelter support. In recent years, bolt support has been gradually promoted, which has the advantage of speeding up the construction schedule, reducing the support cost, supporting the roof quickly and effectively, and supporting strength. However, bolt support also has its limitations. For example, at large-span intersections, chambers and fault-broken zones, bolt support is not enough to maintain engineering stability. Prestressed anchor cable technology can provide greater bearing capacity, a greater scope of action, is an effective support method for engineering support in special areas. The past prestressed anchor cable anchoring technology used in rock Lane, the general use of aperture φ90mm, pre-stress 300kN, the ultimate bearing capacity of 600kN, the support effect is good, the technology