Shield support for the development of thin and medium-thick steeply dipping seams in strips along the dip

Abstract

The urgent task is to create and implement reliable and highly productive methods of mechanized fastening of working faces. The article presents various types of shield support for the development of thin and medium-thickness steeply dipping seams in strips down the dip: 1) sectional shield support; 2) U-shaped shield; 3) L-shaped flexible shield; 4) self-braking shield. The horizontal arrangement of the working face and the development of the seam in strips down the dip significantly facilitate the creation of a simple and efficient shield support. In order to reduce the load on the shield elements, reduce metal consumption and ensure the most reliable operation, it is necessary to prefer flexible shields consisting of support frames or short sections (0.5-1.0 m) connected by a flexible connection. With a seam thickness from 0.6-0.8 to 3.0-4.0 m, the use of L-shaped shields is most appropriate. U-shaped shields are less rational due to their excessive bulkiness and difficulty in controlling them when lowering. The proposed shield support can be used in the development of steeply dipping seams with a thickness of 0.6-0.8 to 3.0-4.0 m, with an angle of incidence greater than 50-55° and with medium-hard and strong wall rocks.