In excavation of double span tunnel, there exists a big water-eroded groove. The method of elastic foundation beam is used to cope with the situation.
双跨隧道在岩溶地区施工中遇到大型溶槽,采用弹性地基梁法成功跨越。
It is to be square-a span long and a span wide-and folded double.
这胸牌要四方的,叠为两层,长一虎口,宽一虎口。
FIG. 12 illustrates a timber double post roof truss. This type of truss is constructed where a wider span or a less restricted roof space is required.
图12所示为一个双柱木屋顶桁架。这种桁架主要建于跨度要求较大或屋顶空间限制较少的地方。
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