我队自1955年起学习推广钢绳钻粒的钻进方法.经部份机场试点,收效很大,纵自1956年起在所有机场都推行了钢粒钻进法.几年来试行结果证明,钢粒钻进较铁砂钻进更有其独特之长,它适于钻进VII～XII级的岩层,钻进VII～IX级的岩层效果尤大.兹将我队在推行钢粒钻进操作中的最优参数和调节方法,初步介绍如下,供各单位参考. Our team has been studying the promotion of drilling methods for steel wire drills since 1955. Pilot pilots at some airports have yielded great results and have been piloted at all airports since 1956. Proof of results over the years shows that, It is more suitable for drilling into rock formations of grade VII-XII than drilling into sand, and drilling into rock formations of grade VII to IX is especially effective. In the optimal parameters and adjustment methods, the initial introduction is as follows, for reference of all units.