LsL3sq??(m) (2-8)
2240R2L2L4ss?(m) (2-9) p?24R2384R3?0?28.6479T?(R?p)tgLs(rad) (2-10) R??q(m) (2-11)
2L?(??2??0)180R?2Ls(m) E?(R?p)sec?2?R(m) J?2T?L JD1处的几何元素:
?502?503q240?4002?24.996mp?50250424?400?2384?4003?0.260m?6479?500?28.400?3.581?T=(400?0.260)tg12.578?2?24.996=69.104m
L?(12.578?-2?3.581?)?180?400?2?50=137.802mE?(400?0.260)sec12.578?2-400=2.683mJ?2?69.104?137.802?0.405m2.4 主点里程的计算
主要点里程: JD1处:
JD1? K0+124.350
ZH1?JD1?T? K0+055.246 HY1?ZH1?Ls? K0+105.246 YH1?HY1?L?2Ls? K0+143.049 HZ1?YH1?Ls? K0+193.049
(2-12)
(2-13)
(2-14)
QZ1?HZ1?L? K0+124.147 2其余各点计算里程桩号为。
桩 号 桩 号 桩 号 K0+000 K0+020 K0+040 K0+055.246 K0+060 K0+080 K0+100 K0+105.246 K0+120 K0+124.147 K0+140 K0+143.049 K0+160 K0+180 K0+193.049 K0+200 K0+220 K0+240 K0+260 K0+280 K0+300 K0+313.509 K0+320 K0+340 K0+360 K0+363.509 K0+367.279 K0+371.049 K0+380 K0+400 K0+420 K0+421.049 K0+440 K0+460 K0+480 K0+487.665
2.5 公路中桩坐标的计算 2.5.1 计算直线中桩坐标
如图2-2,设交点坐标为JD(XJ,YJ),交点相邻直线的方位角分别为A1和A2。
NJDNαQZA1ZHHYYHA2HZ
图2-2 中桩坐标计算图
则ZH(或ZY)点坐标:
XZH?XJ?Tcos(A1?180?) (2-15)
?Y?YJ?Tsin(A?180) (2-16) ZH1
HZ(或YZ)点坐标:
XHZ?XJ?TcosA2 (2-17)
YHZ?YJ?TsinA2 (2-18) 设直线上加桩里程为L,ZH,HZ表示曲线起、终点里程,则 前直线上任意点坐标(L?ZH)
X?XJ?(T?ZH?L)?cos(A?1?180) Y?YJ?(T?ZH?L)?sin(A1?180?) 后直线上任意点坐标(L?HZ)
X?XJ?(T?L?HZ)?cosA2(2-21)
Y?YJ?(T?L?HZ)?sinA2 2.5.2 计算曲线中桩坐标
曲线上任意点的切线横距:
l5?l?40R2L2?l944?l13x66????s3456RLs599040RLs 式中:l—缓和曲线上任意点至ZH(HZ)点的曲线长 Ls—缓和曲线长度
1) 第一缓和曲线(ZH?HY)任意点坐标:
X?Xxcos(30l230l2ZH??RL)?cos(A1??)s?RLs Y?Y?xcos(30l2ZH?RL)?sin(A?30l21?RL)s?s
2) 圆曲线内任意点坐标 a 由HY?YH时,
X?XlHY?2Rsin(9090(l?Ls)??R)?cos???A1???R?? (2-19) (2-20)
(2-22)
(2-23) (2-24)
(2-25)
Y?YHY?2Rsin(90(l?Ls)?90l? )?sin?A1????R?R??式中:l—圆曲线内任意点至HY点的曲线长; XHY,YHY—HY点坐标; b 由YH?HY时:
X?XYH?2Rsin(90(l?Ls)?90l?)?cos?A2?180???R?R??? (2-26)
Y?Y90l(l?Ls)?YH?2Rsin(90?R)?sin???A2?180???R??
式中:l—圆曲线内任意点至YH点的曲线长; 3) 第二缓和曲线(HZ?YH)内任意点坐标;
X?Xcos(30l2?RL)?cos(A30l2HZ?x2?180???RL)ss 2Y?Y?xcos(30lHZ?RL)?sin(A30l22?180??)
s?RLs式中:l—第二缓和曲线内任意点至HZ点的坐标; 4) 方向角计算
a 缓和曲线上坐标方向角:
?90l2i?Ai???RL, i?1,2???n s ?转角符号,第一缓和曲线右偏为“+”,左偏为“—”; 第二缓和曲线右偏为“—”,左偏为“+” ;
式中:l—缓和曲线上任意点至ZH(HZ)点的曲线长;
Ls—缓和曲线长度;
b 圆曲线上坐标方向角:
?s)i?A90(l?Li???RL, i?1,2???n s ?为转角符号,右偏为“+”,左偏为“—”; 2.5.3 坐标计算过程
以桩号ZH、K0+020、K0+100和K0+120为例,计算如下: (2-27)
(2-28)
(2-29)
已知:交点JD1处坐标为(451.753 ,332.446),T= 69.104 m,A1=98.779°,Ls=50m 1) ZH点坐标:
XZH?451.753+69.104cos(98.779°+180°)=462.301
YZH?332.446+69.104sin(98.779°+180°)=264.152
2) K0+020 点处于前直线段上,坐标为:
+180°)=467.68 X?451.753+(69.104+55.246-20)×cos(98.779°
+180°)=229.319 Y?332.446+(69.104+55.246-20)×sin(98.779°3) K0+100点处于ZH与HY之间,坐标为:
l?100?55.246=44.754
44.754544.754944.75413x?44.754???=44.743
40?4002?5023456?4004?504599040?4006?50630?44.754230?44.7542X?462.301?44.743cos()?cos(98.779?)=456.210
??400?50??400?50 30?44.754230?44.7542Y?264.152?44.743cos()?sin(98.779?)=308.484
??400?50??400?50
4) K0+120点处于HY与YH之间:l?120?105.246=14.754
X?455.701?2?400?sin(90?14.75490?(14.754?50)??)?cos?98.779?=454.635???400??400??
Y?313.706?2?400?sin(90?14.75490?(14.754?50)??)?sin?98.779?=328.420 ???400??400??
表2:逐桩坐标表 计算出路线的逐桩坐标如下页表:
坐 标 桩 号 N (X) K0+000 K0+020 K0+040 E (Y) 桩 号 坐 标 N (X) E (Y) 470.733 209.553 K0+363.509 466.078 571.544 467.680 229.319 K0+367.279 465.952 575.312 464.628 249.085 K0+371.049 465.774 579.078 K0+380 K0+400 K0+420 465.150 588.006 462.957 607.884 460.144 627.685 K0+055.246 462.301 264.152 K0+060 K0+080 K0+100 461.576 268.850 458.647 288.635 456.210 308.484 K0+421.049 459.991 628.723