#$%^&*AU2017200004A120170720.pdf#####ABSTRACT OF THE INVENTION An overcast system to block an intersection between two or more mine passageways so as to prevent the mixture of intake air with return air. The overcast system includes a first sidewall formed of one or more prefabricated panels, a second sidewall formed of one or more prefabricated panels, and a top member formed of one or more prefabricated panels, such that the top side spans the width between the first sidewall and the second sidewall. A fire-resistant coating is applied to at least a portion of the first sidewall, the second sidewall, or the top member to provide an air-tight, fireresistant structure. Each of the one or more prefabricated panels is formed from a composite material having one or more structural studs embedded at least partially therein. 85629381 (GHMatters) P104968.AUmZ / P.
展开▼
