快硬水泥三细锚杆的研制

ESEARCH AND TEST OF TRIMINI- DIAMETER ROCKBOLT HELD WITH QUICK CEMENT

根据三细锚杆的特点，将杆体锚固段变为易于加工安装、抗拔拉阻力大的树枝状，并对锚固长度、水灰比和水泥卷规格等作了调整，研制出快硬水泥三细锚杆。井下拔拉试验证明其锚固可靠。在工业性试验中，辅以金属网，将其用于综采切眼的支护取得成功。

According to the properties of trimini-diameter rockbolt, a kind of trimini-diameter rockbolt held with quick cement is workout.lts held section has treelike shape easily manufactured, installed and of greater resistance to the pull-out force.The held length,ratio of water to cement and roll specifications of the rockbolt are adjusted. Its anchoring reliability has been proved by underground pull-out test.In the industrial trials,this kind of rockbolts with metal net is successfully used to support an opening in coal.