Problems and improvement’s suggestions for self drilling anchor in mine
The supporting of self drilling anchor bar is an active form of support, which has the advantages such as good supporting effect,low cost,etc,which represents the development direction of the roadway bolting technology, greatly simplifies the coal working face end support and advanced support process, it ensure the safety of coal production. It has created favorable conditions for the rapid development of coal mining face and coal production.
However, with the deepening of coal mining depth, the mining progress has been accelerated, the geological conditions have become increasingly complex, and the influence of mining has become larger and larger, and many problems of the high strength metal self drilling anchor bolts have been exposed,which can lead to poor support effect and affect the mining progress of high productivity and high efficiency mine.
The problems existing in the tail of the self drilling anchor bolt
1.The tail strength of the self drilling anchor rod is low
2.The thread processing precision is low
3.The tail extension of the self drilling anchor bolt is not enough
Improved method of self drilling anchor rod tail
1.New metal thick tail of self drilling bolt
2.Reduce the friction at the thread of self drilling bolt