刚性长螺纹锚杆及其在巷帮支护中的应用

为避免巷道扩帮后重新补打锚杆,研发了巷帮支护的一种新型刚性长螺纹锚杆,并在焦作煤业集团赵固二矿进行现场试验,对试验巷道进行深基点位移监测和表面位移监测,监测结果表明,由于刚性长螺纹锚杆有高强长螺纹锚尾,在扩帮后,只需继续拧紧螺母,截掉外露多余部分即可,刚性长螺纹锚杆可以充分利用原有巷帮支护,避免重新补打锚杆,不仅节省扩帮维修费用,还能缩短巷道维修时间,其支护效果要优于普通锚网索的支护效果。

Rigid Long Threaded Bolt and Its Application in Roadside Support

For the roadway which required slope expansion during the service period, in order to avoid refilling bolts after the slope expansion, we developed a new type of bolt which can be used in roadside support. Rigid long threaded bolt which is made of metal rod body, rod connector, connecting bolt and high-strength long-threaded bolt tail. According to the field test, its overall tensile performance is the same to the common steel bolt of the same diameter. In Zhaogu Two Mine, Jiaozuo Coal Group, we did field tests, meanwhile the deep basic points displacement monitoring and surface displacement monitoring of the test roadway was carried out. The monitoring results show that the supporting effect of rigid long threaded bolt is superior to the supporting effect of common cable anchor. For the roadway which required slope expansion during the service period, due to the rigid long threaded bolt has high-strength long-threaded bolt tail, so after the slope expansion, continue to tighten the nut, and cut off the excess part can be. It can make full use of the existing roadside support, avoid refilling bolts, not only can save a large number of slope expansion costs, but also can shorten the time of repairing the roadway.