在输油管道跨越河流时，其自重荷载大、设计跨度大的特点给工程设计和施工带来了诸多问题。
In oil pipeline's river crossing, the characteristics of heavy load of pipeline's dead weight and large span of design will bring many problems to engineering design and construction.
在管道跨越工程中，常用三角形截面组合管拱，由三角形截面桁梁的受力分析图，分析推导出其抗剪刚度。
The pipeline bridge is built up with triangle sections, its shear stiffness can be derived from the stress diagram for the truss with triangle section.
双层海底管道的跨越设计既需要考虑跨越构形引发的应力应变，也需要充分校核管道跨越段的垂向稳定性。
For the crossing section design of the pipe-in-pipe systems, it is necessary to consider the stress-strain initiated by crossing configuration and check the vertical stability of the crossing section.
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