公路勘测设计1 ppt课件

1、一、纸上确定道路一、纸上确定道路纸上定线：在大比例尺普通以纸上定线：在大比例尺普通以1 1：10001000为宜地形图上确定道路中为宜地形图上确定道路中线的位置的过程。线的位置的过程。AA图6-1 纸上放坡示意图穿直线：按照穿直线：按照“照顾多数，保证重点的原那么综合思索平面线形设照顾多数，保证重点的原那么综合思索平面线形设计的要求，穿线交点，初定道路导线初定出交点。计的要求，穿线交点，初定道路导线初定出交点。敷设曲线：按路中线方案经过部位选取且注明各弯道的圆曲线半径，敷设曲线：按路中线方案经过部位选取且注明各弯道的圆曲线半径，缓和曲线长度等。缓和曲线长度等。确定道路方案确定道路方案纸上放坡纸

2、上放坡定导向线定导向线平面试线平面试线一、纸上确定道路一、纸上确定道路1直线型法传统法直线型法传统法2曲线型法曲线型法纵断面修正导向线纵断面修正导向线定线定线二、实地放线二、实地放线ABDJDE导1导2导3导4导5导61018223012图6-3 支距法放线1 1在图上量取支距在图上量取支距2 2在实地放支距在实地放支距3 3穿线交点穿线交点二、实地放线二、实地放线2 2解析法解析法N400N200N000E200E400E600E800E1000E1200E1400E1600JDA导1导2MJDBL(y1,x1)(y2,x2)图6-4 解析法放线1 1计算道路与导线的夹角计算道路与导线的夹角

3、 从平面图上可量出交点从平面图上可量出交点JDAJDA、JDBJDB的经纬距的经纬距YA YA 、 XA XA，YB YB 、 XB XB那么那么JDAJDBJDAJDB的象的象限角可按下式计算：限角可按下式计算：tan 导导1-1-导导2 2的象限的象限角角知，那么知，那么JDAJDAJDBJDB与导与导1-1-导导2 2的夹的夹角：角：=-=-二、实地放线二、实地放线2 2解析法解析法N400N200N000E200E400E600E800E1000E1200E1400E1600JDA导1导2MJDBL(y1,x1)(y2,x2)图6-4 解析法放线2 2计算间隔计算间隔L L3 3放线放

4、线 导线与道路交点导线与道路交点M M的位置可由的位置可由L L来确定，先计算来确定，先计算M M点的经纬距点的经纬距XMXM、YMYM解以解以下联立方程即可：下联立方程即可：sincosl式中：式中：Y1Y1、X1X1，Y2Y2、X2X2导导1 1、导、导2 2的经纬距；的经纬距；YAYA、XAXA、YBYB、XBXBJDAJDA、JDBJDB的经纬距。可由平面图上量得的经纬距。可由平面图上量得2222YX）（）（MMYXl二、实地放线二、实地放线二、实地放线二、实地放线计算道路起点计算道路起点A A与导线的关系：与导线的关系：知导知导1 1的经纬距为的经纬距为Y1=10259Y1=1025

5、9，X1=10117X1=10117，导导1-1-导导2 2的象限角的象限角N72N7214140707；从平面图上；从平面图上量得量得A A、B B的经纬距为的经纬距为YA=10268YA=10268，XA=10045XA=10045，YB=12094YB=12094，XB=11186XB=11186。导导1-A1-A的象限角为：的象限角为：E033010117111861025910268arctantan=S03706503700000583283100704172037018000005810045111861026812094arctan ）（ENABAB的象限角为：的象限角为：导导

6、1A1A的间隔为：的间隔为：)m(56.720370cos71011710045cosXXA1A=二、实地放线二、实地放线二、实地放线二、实地放线叫拨角测距法，至少需求两叫拨角测距法，至少需求两个导线点，采用全站仪。个导线点，采用全站仪。Ti-1PJDTiPDTiTi-1NAA0a)b)图 6-7 极坐标放线示意图Ti-1PJDTiPDTiTi-1NAA0a)b)图 6-7 极坐标放线示意图谢谢！谢谢！K8H5E2A+x(u$rZnWkThPeMbJ7G4C1z-w&t!qYmVjRgOdL9I6F3B0y(v%s#oXlUiQfNcK8H5D2A+x*u$rZnWkShPeMaJ7G4C1z

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16、fNcK8H5D2A+x*u$rZnWkShPeMaJ7G4C1z)w&t!pYmVjRgOcL9I6E3B0y(v%s#oXlTiQfNbK8H5D2A-x*u$qZnWkShPdMaJ7F4C1z)w&s!pYmUjRgOcL9H6E3B+y(v%r#oWlTiQeNbK8G5D1A-x*t$qZnVkShPdMaI7F4C0z)w&s!pXmUjRfOcL9H6E2B+y(u%r#oWlThQeNbJ8G5D1A-w*t$qYnVkSgPdLaI7F3C0z)v&s#pXmUiRfOcK9H5E2B+x(u%rZoWlThQeMbJ8G4D1A-w*t!qYnVjSgPdLaI6F3C0

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19、-w&t!qYmVjRgOdL9I6F3B0y(v%s#oXlUiQfNbK8H5D2A+x*u$qZnWkShPeMaJ7G4C1z)w&t!pYmVjRgOcL9I6E3B0y(v%r#oXlTiQfNbK8G5D2A-x*u$qZnVkShPdMaJ7F4C0z)w&s!pYmUjRfOcL9H6E3B+y(v%r#oWlTiQeNbK8G5D1A-x*t$qZnVkSgPdMaI7F4C0z)v&s!pXmUjRfOcK9H6E2B+y(u%rZoWlThQeNbJ8G4D1A-w*t$qYnRgOcL9H6E3B+y(v%r#oWlTiQeNbK8G5D1A-x*t$qZnVkSgP

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