当较近支撑不可行时，则只能以最大跨距间隔进行支撑。
Supports shall be spaced at the maximum spans only when closer support is not possible.
主站房采用巨型空间桁架结构体系，主站房屋盖南北连续主跨280米，最大跨距81米，创造出体现结构力学之美的轻盈屋盖，充满动感和未来感。
The roof of mainstationroom spans 280 meters from south to north and the maximum outreach is 81 meters by using giant space truss work system.
将采场顶板简化为岩梁模型，岩梁的最大拉应力及其极限跨距是采矿工程涉及到的两个重要参数。
The roof in working areas is simplified as rock beam, the maximum tensile stress and limited span of rock beam are important in mining engineering.
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