Research On The Traffic Safety Analysis And Facilities Setting In Reconstruction And Extension Work Zone Of Highway

Transportation infrastructure is the vitals of the national economy, and highway is the important part of the transportation infrastructure. The total mileage open to traffic in China are increasing and the proportion of freeway and first-class highway and second-class highway are all increasing to adapt quick development of society economy. After building and opening to traffic, highway and its establishment become aging and damaged with increasing of the traffic load and processing of service time, so it needs maintenance or reconstruction, at the same time, more highways need alteration and reconstruction. By incomplete statistic, which highway needs reconstruction and extension or heavy maintenance is more than 8% to all. In the process of reconstruction and extension or heavy maintenance, because of the integrated infection of many factors, traffic accidents frequently occurred, traffic safety trend was very serious, and more and more people pay attention to it now. This paper is mainly theoretically studying the traffic safety problems during the reconstruction and extension or heavy maintenance, then giving some management and project countermeasure. In the study process, TONGSAN highway on JIAHA section is the mainly case for survey and analysis.Firstly, the paper investigated and collected traffic accident data of highway in Heilongjiang province recently, especially during reconstruction and extension of highway, studied traffic accident characteristics and influencing factor, studied the genesis of traffic accident based on original traffic accident data in reconstruction and extension of highway by analyzing classical case of traffic accident in reconstruction and extension of highway, and identified accident black spots during reconstruction and extension applying cumulative frequency method. Then, the paper analyzed pavement operating characteristics, horizontal curve radius and longitudinal gradient characteristics, traffic volume distributing and traffic composition characteristics of reconstruction and extension section, established vehicle running speed model of different kinds of vehicles in different interval on reconstruction and extension section using regression analysis method by actual investigation.The paper analyzed vehicle running characteristic and running risk factors in work zone of reconstruction and extension of highway, compared and analyzed traffic safety condition during the period of construction and non- construction and in work zone and non-work zone according to highway traffic accident data of Heilongjiang province and Harbin City, revealing the phenomenon and rule that traffic safety condition is more serious in work zone of reconstruction and extension. Using traffic conflict theories, the potential danger of vehicle running in the work zone during the period of the vehicle driving near the work zone, passing the work zone and leaving the work zone is analyzed, and traffic conflict model of three processing above is analyzed from one-way totally enclosed condition and one-way not totally enclosed condition, then the traffic conflict model of reconstruction and extension work zone is established.The paper discussed the problem of proper length in reconstruction and extension work zone of highway, gave the suggestion value of warning zone length component Lv and Ls of cement and asphalt concrete pavement on drying and damp condition in different longitudinal gradient, discussed optimal length determination of two lanes and four lanes in work zone analyzing with examples, deduced advanced distance formula of traffic signs of reconstruction and extension work zone, brought forward calculation method of repeated setting distance of signs and function time of signs in driver's visual field, gave the corresponding suggestion value, analyzed the process of the vehicle collision to barrier and the height request of the barrier setting, gave suggestion value of different kinds of barrier height and brought forward a method of making barrier column higher with the bushing.The paper brought forward following project measures to guarantee traffic safety on reconstruction and extension section: adopted the LANDPAC impact compaction technique and breaking up the deteriorated cement concrete plank reducing the reflector crack caused by deteriorated cement concrete plank at the joint and prolonging the spacing of the reflector crack, adopted adjusting graduation of the mixture of the bituminous concrete to improve the safety performance to increase anti-slippery function, the anti-rut ability, the durability of highway, fitting to the characteristics of the seasonal frost zone in Heilongjiang province, adopted lifting technique of bridge aiming at solving underclearance deficiency in the reconstruction and extension project in highway.The main research innovative results of obtain include: brought forward the location condition which used to confirm the traffic sign setting of the reconstruction and extension work zone, gave the suggestion value of Lv and Ls which used to confirm the length of warning zone of the reconstruction and extension work zone, established traffic conflict model of the reconstruction and extension work zone, established running speed model of various vehicle on the reconstruction and extension section, analyzed main traffic accident influencing factor on the reconstruction and extension section of highway, revealed the phenomenon and rule of traffic safety severity of the reconstruction and extension work zone, brought forward a method of making barrier column higher with the bushing, adjusted graduation of the mixture of the bituminous concrete to increase anti-slippery function, adopted the LANDPAC impact compaction technique to reduce the reflector crack caused by deteriorated cement concrete plank, adopted the lifting technique of bridge to guarantee underclearance.