建筑资料（Building materials）.doc

建筑资料（Building materials） Road network planning and route survey design Road network planning should consider the coordinated development of various transportation functions, and improve the layout of the road network. Route survey and design should be based on the national classification management and technical indicators, road engineering The selected technical and economic route optimization, comprehensive design of vertical and horizontal three aspects, and strive to short the plane smooth, uniform cross section, vertical gentle slope stability of the economy, in order to ensure that the design speed and shorten the running time, improve vehicle turnover rate. The design of subgrade, pavement, bridge, tunnel, drainage and other structures are carefully designed. Under the condition of guaranteeing quality, construction, maintenance, operation and traffic management are reduced. Subgrade engineering The subgrade is the main part of the road and the foundation of the road and bears the load of the road with the road surface. The subgrade is divided into three types: embankment type, cut type and semi fill type. The shoulder is the inner part of the subgrade edge on both sides of the road to support the road surface and is used for the temporary stopping of vehicles or pedestrians. According to the roadbed earthwork excavation difficult for earthwork (soil, soil, hard soil and rock engineering (three), soft stone stone, stone three). Roadbed engineering in road construction, large quantity, wide area, often is the key to the control of the construction schedule is required as much as possible and water conservancy construction along the combination and strive to save land; second, in accordance with the standard design, strictly control the construction quality, ensure the subgrade with sufficient strength and stability; the good drainage and protection of the subgrade reinforcement project, attention should not be destroyed by the flood; the embankment should be c