Fuzhou World Bank Financed Projects Nanjiang Binlu, Phase-ii project of the Third Ring Road and Kuiqi Bridge environmental impact report
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- 2.1.5Road cross section of the Phase-II Project of the Third Ring Road
- 2.1.6Road cross section of Kuiqi Bridge
- Drainage system
- 2.1.8Drainage system of the Phase-II Project of the Third Ring Road
- 2.1.8.2Design principle
Road cross section2.1.4Road cross section of Nanjiang BinluThe proposed Nanjiang Binlu of 40m wide is arranged as follows: 3m (pedestrian way) +1.5m (tree hole) +3.5m (nonmotorized vehicle lane) +3.5m +3.5m (side separator) +17m (bidirectional 4 lanes) +3.5m (side separator) +3.5m (nonmotorized vehicle lane) +1.5m (tree hole) 3m (pedestrian way) = 40m (total width), see Fig. 2.4-1.
2.1.6Road cross section of Kuiqi BridgeThe bridge deck width will be 36m. Cross section: 2m (pedestrian way) +1m (movable separators and marginal strip) +3m (nonmotorized vehicle lane) +11.25m (3 lanes) +1.5m (anti-collision guardrail) +11.25m (3 lanes) +3m (nonmotorized vehicle lane) +1m (movable separators and marginal strip) +2m (pedestrian way), see Fig. 2.5-3. Drainage system2.1.7Nanjiang Binlu drainage systemOne side of the road is close to or near the Minjiang River. The road starts from Sanxianzhou Bridge and ends at 200m south to the Third Ring Road, between which along the line are Jiefang Bridge, Minjiang Bridge, Aofeng Bridge, Xindangzhou, Puxiazhou and villages such as Shaoqi Village. The watercourses available along the line are Gangtou River, Longjin River branch, Yuejin River, Pandun River, Linpu River. The road will be built mostly by earth fill. Design elevation of the pavement is basically higher than blocks and villages along the road. Most of road drainage system can only be used to drain rainwater from the road. The road section from Sanxianzhou Bridge to Jiefang Bridge will make use of the existing road and part of the section will be transformed, and the existing drainage system will also be utilized to drain water as far as possible. The road drainage system from Jiefang Bridge to Gangtou River and from Linpu River to the design road end shall be used to drain rainwater and sewage from the pavement and from along the road. The road drainage will adopt rainwater/sewage separation system. The Fuzhou rainfall formula is adopted in rainwater design with a design recurrence interval of 1 year. The standard of sewage amount will be assumed as 100t/ha•d and the rainwater pipe will designed based on full flow and the sewage pipe will be designed based on non-full flow. The minimum diameter of main rainwater pipe is D500 and the maximum D2000. The diameter of main sewage pipe is D400. 2.1.8Drainage system of the Phase-II Project of the Third Ring Road2.1.8.1Current situation and plan of drainageThe road project starts from Wanbian Bridge and ends at the south end of the proposed Kuiqi Bridge with a total length of 12.474km. The road is flanked almost by villages and the water is drained by overflow on the ground and through side ditches, no rainwater/sewage piping available. The inland rivers the road crosses or runs along are all natural watercourses having not been dredged or trimmed. The rainwater/sewage separation system is adopted for the proposed project. The rainwater along the road will be drained nearby and its outlets will be arranged in Yangqi River, Mupai River, Wushan River, Wushan River Branch, Zhulan River, Difeng River, Baihuting River, Luocheng River and Linpu River etc.
The design recurrence interval for rainwater is one year, and the surface runoff coefficient is 0.75. Rainwater/sewage separation system is adopted. The rainwater piping is designed based on full flow. The sewage piping is designed based on non-full flow. The minimum diameter of the rainwater main pipe is d400mm and the maximum d2000mm. The minimum diameter of the rainwater branch pipe is d400mm and that of rainwater connecting pipe d300mm. The spacing between access galleys is about 30m. The minimum diameter of the sewage main pipe is d400mm, and the maximum d1200mm. The minimum diameter of the sewage branch pipe is d300mm. The pipe specification and materials shall accord with GB11836-89. Choose relative parameters in accordance with 《Design specification of Outdoor Drainage》and check them according to the current standard. The minimum flow velocity of rainwater is 0.75m/s and that of sewage 0.6m/s. To coordinate with pipelines construction of public services and facilities in the design road section, the buried depth of top designed rainwater/sewage piping will be 1.5～2.0m. Rainwater/sewage pipes will be laid in pedestrian way or auxiliary lane for easy maintenance. When sewage piping goes through an internal river, inverted siphon will be adopted and access opening provide. User’s branch piping is preserved within the range of 70 to 100m. Directory: curated curated -> Concept stage curated -> Concept stage curated -> Republic of Côte d'Ivoire Urbanization Review curated -> Report No: aus11011 Central America curated -> Report No. 94474-pk fiscal Disaster Risk Assessment Options for Consideration curated -> Environmental and Social Management Framework for the Costa Rica Telecommunications Sector Modernization Project curated -> Environment Impact Assessment For Jiangxi Shangrao Sanqingshan Airport Beijing Guohuantiandi Environmental Technology Development Center. Ltd. Oct. 2012 Content curated -> Growth through Innovation An Industrial Strategy for Shanghai By Shahid Yusuf Kaoru Nabeshima April 22nd, 2009 curated -> Report No: 70178. People's Republic of China Download 3.93 Mb. Share with your friends:
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