山区三级道路设计设计书

1 摘要

本道路位于广东省内，设计路段属于省内山区道路之一，设计速度40 km/h。本课程设计采用专用地形图，比例尺为1：2000。

然后在1:2000地形图上确定两条备选路线，分别进行平面设计，纵断面设计，横断面设计，最后对所定路线进行方案比选，从中选择最佳方案。

详细设计从确定方案中选取进行设计，前期工作较初步设计更具体化，此外还对路基，路面，排水进行了详细设计。

关键词 道路等级；平曲线；竖曲线；排水；路基；

山区三级道路设计设计书

2

Abstract

This road is located in guangdong province, design of a

mountain road sections belong to the province, design speed

40 km/h. This course design using special topographic map,

scale for 1:2000.

Then in 1:2000 topographic map sure two alternative route

alignment respectively, graphic design, design of

cross-sectional design, finally appointed route than scheme

choice, choose the best solutions.

The detailed design select from a fixed design scheme, the

prophase work is relatively preliminary design more specific,

in addition to the subgrade, pavement, a detailed design

drainage.

Keywords Road ranks; Smooth curves; Vertical curve;

Drainage; Subgrade;

山区三级道路设计设计书

3 目 录

1 设计总说明.........................................................................................................................5

1.1公路设计概况：............................................................................................................5

1.2平面设计标准的确定....................................................................................................5

1.3路线起讫点：................................................................................................................5

2 道路参数.............................................................................................................................5

2.1 道路等级的确定...........................................................................................................5

2.2 公路技术标准的确定...................................................................................................6

2.3 控制要素.......................................................................................................................6

2.4平面设计技术指标........................................................................................................7

2.4.1圆曲线最小半径..................................................................................................7

2.4.2圆曲线最大半径..................................................................................................7

2.4.3圆曲线半径的选用..............................................................................................7

2.4.4平曲线最小长度..................................................................................................7

2.4.5缓和曲线技术要求..............................................................................................8

2.4.6平曲线要素的确定..............................................................................................8

2.4.7初步设计的平曲线加桩....................................................................................10

2.4.8曲线主点桩号计算............................................................................................11

2.5 路线方案的拟定与比较.............................................................................................11

2.5.1选线的依据：....................................................................................................11

2.5.2 选线的原则：...................................................................................................12

2.5.3 两方案综述.......................................................................................................12

2.5.4方案比较............................................................................................................12

2.5.5 两方案比选结果...............................................................................................13

2.6道路平面设计..............................................................................................................13

2.6.1平面选线的原则：............................................................................................13

2.7道路纵断面设计..........................................................................................................13

2.7.1、纵坡设计的一般要求.....................................................................................14

2.7.2、最大纵坡.........................................................................................................14

2.7.3、最小纵坡.........................................................................................................15

2.7.4、坡长限制.........................................................................................................15

2.7.5、平、纵组合的设计原则.................................................................................16

2.7.6、平、纵组合的基本要求.................................................................................16

2.7.7、纵面线形设计中应注意避免的组合：.........................................................17

2.8道路横断面设计..........................................................................................................17