| 摘要 |
Metal frame yielding support has roof bar (1), arranged with horizontal straight middle section connected at two sides to curvilinear end sections by means of curvilinear transition sections. Standpipes (2) are arranged with curvilinear upper end sections. Units (3) of yielding are formed with connected with lap curvilinear end sections of roof bar (1) and curvilinear upper end sections of standpipes (2), arranged with same radii Rof curvature and connected to each other with locks (4). To increase inner space of working standpipes (2) in whole length are made curvilinear with radius of curvature corresponding to radius Rof curvature of curvilinear upper end sections of those. At that radius Rof curvature of standpipes of curvilinear upper end sections, radius Rof curvature of curvilinear transition sections of roof bar (1), height Н of support, length Lof horizontal straight middle section of roof bar (1) and length Lof curvilinear standpipes (2) are calculated by respective formulae. |
