RECTANGULAR METAL OR COMBINED SUPPORT OF DEVELOPMENT WORKINGS Russian patent published in 1998 - IPC

FIELD: mining. SUBSTANCE: frame rectangular metal special section or combined with capping from special section support for development workings includes capping, props, interframe connections and interframe roofing. Cappings are made combined from several straight members joined by yokes from clamps, strips, nuts and lengths of special section joined to support members by electric welding in their manufacture. EFFECT: considerable increase of width and cross-section of working with small height due to cantilevered parts of capping and additional third prop; increased bearing capacity ensured by installation of interframe connecting members. 3 dwg