Content in accordance with part I o

Content in accordance with part I of this design for road and bridge Department of the Guangxi yizhou to xincheng topographic maps provided by selected lines on the paper. Selected lines, make full use of land for construction requirements, less farmland as possible, carefully survey the route level section of the geological and hydrological conditions, as possible routes, economy and safety of premises, reducing investment.
Gao Chengxiang vertical routes to avoid contour lines, parallel with the contour of choice. In order for the linear and elegant, this design, using swing curves, curve length, circular curve requirements as much as possible, 1:1:1~1:2:1. Horizontal curves and vertical curve design, meet the requirements of combination packages for vertical; the largest synthetic slope requirements shall not be greater than the 9%, synthesis of minimum slope must not be smaller than the 0.5% to avoid sharp bends and steep slope overlapping alignment. Except this requirements zhiwai, in above conditions allows of situation, as used high of technology standard, anyway to guarantee makes flat longitudinal linear Shun suitable, and reasonable, and song line beautiful, not allows conditions of situation, Middle design of plane, linear basically in meet technology requirements, economic index premise Xia, consider less accounted for cash crops to, and fill dug balance, the developed has two a programme: party case, and b programme, after programme than selected, party case set selected for are selected programme.