FACE TIMBERING FOR THE HOLDING OF THE HORIZONTAL WORKING IN THE UNSTABLE ROCKS OR IN THE ROCK BURST

摘要

The face timbering for the holding of the horizontal working in the unstable rocks or in the rock burst includes the face lags, consisting of the outer and inner locking elements, connected with longitudinal bars, the bearing elements, made of sheet steel of the rectangular shape and having the equal size, the inter-frame couplers. The tightenings are made of corrugated sheet metal with convex wave in the middle and with half-waves along the edges. The tightenings, in turn, are placed on the one end, are the wedge-shaped, concaved, bent down at the right angle with the end hole on the other - the wedge cut with the possibility of connection of two tightenings by introduction of the performances in the neck.