Movable roof support and bolter system

摘要

A mine roof support system includes a plurality of truss members each having first and second ends which are positioned in spaced relationships one behind another. There are vertically extensible props under each end of the truss member which include stabilizer sleeves to stabiize the truss members thereabove. The vertically extensible props can be extended and retracted to adjust a vertical height of the props for supporting the truss member and for moving it into and out of engagement with the mine roof. Each of the props is supported by a ground engaging means in the form of a selectively operable propulsion unit capable of being operated to produce horizontal movement of the respective props and ends of the truss members. Connecting elements beneath the ends of the truss members connect the props in tandem relationship to permit the horizontal movement of truss members and associated props relative to each other by the propulsion units. Each of the truss members is horizontally expandable to facilitate transportion through a mine passageway prior to being positioned for movement into and out of engagement with the mine roof. The truss member can include a major portion which is fabricated of reinforced fiberglass to permit deflection without permanent deformation when supporting the mine roof to provide a warning prior to any failure of the truss member under the weight of the mine roof.