Structure for underground chamber - is used in transition area between gallery and coal face, floor beam, and gallery frame beam

摘要

Hydraulic pistons (21, 22) form with the floor beam (19) and/or the horizontal beams of the gallery frame (20) a three link frame (62) and/or present a stabilising construction which has a link arrangement facilitating a relative movement of the gallery frame beams and the floor beam around at least two aces. The stabilising construction has a three axis link (63). Between the horizontal beams of the gallery frame (20) is a hydraulic cylinder, and a hydraulic work cylinder (24) is introduced between the adjacent end parts of the gallery frame beams and side units. On the floor beam (19) is fitted a landing, and between it and side units is fitted a bar with links. USE - In mining, to construct and support a hollow underground chamber.