圆曲线主点测设

圆曲线主点测设 一,目的和要求 ⒈学会路线交点转角的测定方法. ⒉掌握圆曲线主点里程的计标方法. ⒊掌握圆曲线主点的测设过程. 二,内容 ⒈选择路线导线. ⒉测定路线转角. ⒊查取圆曲线测设元素 L,T,E,D. 切线长 T=R,ty 曲线长 L=R,πα/180(α以"度"为单位) 外矢距 E=R,sec -R=R(sec-1) 切曲差 D=2T-L ⒋计标主点里程(即 BC,MC,EC 的里程) BC 里程=IP 里程-T EC 里程=BC 里程+L MC 里程=EC 里程-L/I 校核:IP 里程=MC 里程+D/2,其差值一般不超过±2 厘米. ⒌进行圆曲线主点测设 三,仪器及工具 ⒈到仪器室借领:经纬仪 1,花杆 3,木桩 3,斧子 1,测钎 11,尺(钢尺 或皮尺)1,记录板 1,曲线表一本,测伞一把,书包 1 ⒉自备:铅笔,小刀,计标用纸 四,方法与步骤

⒈在平坦地区定出路线导线的三个交点(IP1,IP2,IP3)如图所示,并在所

选点上用木桩标定其位置,导线边要在于 80m, 目估 β 右<145°. ⒉在交点 IP2,上安置经纬仪,用测回法观测β右,并且计算出转角α. ⒊假定圆曲线半径 R=100m,然后根据 R 和 α 右,在《公路曲线测投用表》 中,查出曲线测设元素 T,L,E,D. ⒋计算圆曲线主点的里程(假定 IP2 的里程已知为 K4+296.67) . IP2K4+ 296.67 -) T BC -) L EC -) L/2 MC + D/2 IP2(校核) ⒌设置圆曲线主点 ⑴在 IP2--IP1 方向线上,自 IP2 时取切线长 T 得圆曲线起点 BC,插一测 钎,作为起始桩. ⑵在 IP2--IP3 方向线上,自 IP2 量取切线长 T 得圆曲线终点 EC,插一测 钎,作为终点桩. ⑶用经纬仪设置β右/2 的方向线,即角β右的角平分线,在此角分线上自 IP2 量取外矩 E,得圆曲线中点 MC,插一测钎作为中点桩. ⒍站在曲线内侧观看 BC,MC,EC 桩是否有圆曲线的线型,以作为概略检 核. ⒎交换工种后再重复 5 的步骤,看两次设置的主点位置是否重合,如果不重 合,而且差得太大,那就查找原因,重新测设,如在容许范围内,则点位即可确 定. 五,注意事项 ⒈为使实习直观便利,克服场地的限制,本次实习规定 30 ∠α 右<40°,R=100m. ⒉以 R,α 为引数,在《公路曲线测设用表》中查曲线元素时要细心查取, 以防出错. ⒊计算主点里程两人独立计算,加强校核,以防算错. ⒋本次实习事项较多,小组人员要紧密配合,保证实习顺利完成.


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