Study On The Street Cross-section Planning Design And Typical Pavement Structure Of Small Town

Small town is developing rapidly in China, but it exits blindness and imitation in construction because of lacking relevant specification and standard, which results in decline of whole street construction level, especially there are many shortages in street planning design rationality and road infrastructure construction. Based on small town's street and traffic system, form the idea of preserving small town's nature characteristic, pleasant dimension, suitable living and economy,this dissertation studies the street cross-section and typical pavement structure,and embodies the street design differences of various small town, finally forms a section design system of small town.Owing to the traffic characteristics of small town is the main foundation to design cross-section and pavement structure, this paper analyzes its traffic characteristic, and lays special stress on analyzing the residents'trip characteristics, including trip purpose, trip rate, trip space, trip time and trip modes. According to the trip length and time of various traffic tools, combing small town's population and land size, it puts forward the trip modes for small town with different size and economy condition. The freight traffic, traffic space distribution and axle weight are analyzed, too.Street cross-section is the street function's reflection and integration, so the function classification is the basis of cross-section design, pavement structure design is also different with the street function classification. Aiming at the problems small town road classification, the paper puts forward the classification method of comprehensive analyzing the street location, the relationship of street and land use and street hierarchy. According to the three aspects, the paper makes street hierarchy and classification, and gives new definitions of various street hierarchies, explains the functions and properties of different street types. Then it builds their correspondence and gives their applications, and forms perfect street classification system of small town.By analyzing the street function's harmony, the paper puts forward the integration idea of cross-section design and street network planning,and forms the street function framing by studying the suitable street network layout method and structure so as to provide the theory basis for street section design. From the needs of meeting street traffic function, street scale sense, street public life and traffic structure, it draws a conclusion that the higher street network density and connectivity are the first option for small town. Based on the specification and informed research, the paper gives the road network density and street grade proportion, and analyzes the relationship of road density, road area rate and width.On the basis of preceding chapter this paper studies the street cross-section design. It puts forward the street cross-section design should adapt the street function system and be oriented to the street function. It analyzes the features and requirements of cross-section design of small town,and recommends the section forms of different property streets and gives section forms of mountain areas and the river areas according to their landforms and design highlight. Based on the street framing system, the dissertation studies the street cross section elements design. It calculates lane width by vehicle property and design speed, gives the bikeway width by the need of bicycle parallel moving in various streets, summarizes the sidewalk forms, and gives the sidewalk valid width and public installations width of different streets according to the pedestrian feature. Combing road network planning indexes, it determines the range of Rights-Of-Way, and refers the typical street cross-section.Overall consideration of practical and aesthetic function is indispensable in construct friendly streets, in the developmental stage of small town, the practical function is very important, so the paper studies pavement typical structure. On the basis of the traffic grade and basement grade, it matches the traffic grade and the street grade, and analyzes the layer materials and the structure composition request of cement pavement and asphalt pavement. This chapter puts forward the type, thickness and the request suitable for various layers, structure composition types and their applicable areas, and submits the typical structure chart. Based on the asphalt pavement typical structure, it adopts equivalent thickness conversion to give the block pavement typical structure according to the reviser asphalt pavement design method.