摘要
本毕业设计课题为某二级公路施工图设计。本段地势起伏较大，为典型的山岭重丘区地形二级公路。公路全长3.5km,设计时速为40kmh。路面宽7m，路基宽8.5m，路面两侧为0.75m的土路肩。本次设计分别对此公路段进行了几何设计和结构设计。在公路几何设计中,分别进行了平面、纵断面、横断面设计。本段路线平曲线共有交点11个，平均每公里约3.14个,曲线半径最小为130m,最小缓和曲线采用40m,无采用极限平曲线半径。公路设置有S型曲线2个，没有设置简单曲线。路线最大纵坡为2..29%。在公路结构设计中、分别进行了路基路面设计、溜洞设计、防护工程设计。经过交通分析,路面形式采用混凝土路面。垫层为15cm厚的天然沙砾，基层为15cm厚水泥稳定碎石面层为24cm厚水泥混凝土;本段公路设计6个涵洞，其形式有两种。防护工程分别包括挡土墙设计和护坡设计。除了几何设计和结构设计外，还进行了工程量的计算，并进行了施工图预算。
关键词:二级公路;几何设计;结构设计;工程量的计算;施工图预算
Abstract
The topic of this graduation design is the construction drawing design of a second-class highway.This section of the highway is located in a terrain with significant undulations,representing a typical mountainous and hilly area for a second-class highway.The highway has a total length of 3.5 km,with a design speed of 40 km/h.The road surface width is 7 m,and the roadbed width is 8.5 m,with 0.75 m of earth shoulders on both sides of the road surface.This design involves geometric design and structural design for this highway section.In the geometric design of the highway,horizontal,vertical,and cross-sectional designs were carried out.The horizontal alignment of this section has 11 intersections,averaging approximately 3.14 intersections per kilometer.The minimum curve radius is 130 m,and the minimum transition curve length is 40 m.No extreme horizontal curve radius was adopted.The highway is equipped with two S-shaped curves and does not have simple curves.The maximum longitudinal gradient of the route is 2.29%.In the structural design of the highway,the roadbed,pavement,drainage tunnel,and protection engineering were designed.After traffic analysis,the pavement type adopted is concrete pavement.The cushion layer consists of 15 cm of natural gravel,the base course is 15 cm of cement stabilized crushed stone,and the surface layer is 24 cm of cement concrete.This section of the highway is designed with six culverts in two different forms.The protection engineering includes retaining wall design and slope protection design.In addition to geometric design and structural design,calculations of the quantities of works and the budget for the construction drawings were also conducted.
Keywords:Second-class Highway;Geometric Design;Structural Design;Quantity Calculation;Construction Drawing Budget
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