1 city embankment design new ideas
City built on the river, urban riverbanks are often populated and economically more developed zone. Therefore, the city embankment plays a vital role in the survival and development of the city. With the advancement of modernization, the city's multi-functional, high-grade construction goals and the overall requirements of sustainable development, that is, the city embankment should not only have a flood control function, but also has a landscape environment function, if necessary, also has a variety of functions such as transportation, business, and so on, to take the road of sustainable development, and to realize the embankment and nature, embankments and the city in harmony. At present, Dandong City and Dandong attached to the county-level city embankment construction has begun to gradually integrated into the city embankment construction of new ideas.
2 Several issues to be considered in the design of urban embankment
Through the design of the comprehensive management project of the South River in Fengcheng City, Dandong City, the important task of the project is to further improve the flood control system of the South River in Fengcheng City according to the new situation of the economic development of Fengcheng City through the construction of the project to improve the flood prevention standards of the city, make full use of the natural landscape formations of the South River on both sides of the body of water, and build a unique, aesthetic landscape to show the city and the city, to realize the harmony between the embankment and nature. With unique, aesthetic landscape to show the city's waterfront ecological landscape unique characteristics of the charm of the South River waterfront ecological landscape to create a healthy and comfortable environment, beautiful natural landscape, deep cultural connotations, regional characteristics of the distinctive multi-functional urban ecological waterfront corridor. The purpose is to meet the flood control requirements, taking into account the landscape, improve the overall flood control capacity of the watershed, beautify the living environment of the people in the region, protect the lives and properties of the people's safety, and improve the ecological environment of the watershed. According to the main task of engineering construction, the following aspects should be paid attention to in combination with the actual situation of the locality: 2.1 The construction of embankment project must be in harmony with the natural conditions of the city, social environment, economic development and other factors. The embankment construction must obey the basin flood control planning firstly, and the arrangement of embankment shoreline should guarantee the need of flood discharge; meanwhile, it should be coordinated with the overall planning of the city, and obey the functional task of embankment given by the overall planning of the city.2.2 Attaching importance to the impact of embankment project on the cityscape, and the combination of the construction of landscape facilities with the cityscape can be considered. City embankment in the flood period is to protect the city's engineering facilities, in the non-flood period should be people's leisure, entertainment, water-friendly places. The construction of waterfront ecology of Nanda River in Fengcheng City combined with the well-known Phoenix Mountain is not only a good place for local city residents to have leisure and play, but also a good place for tourists to contact with nature, feel the beauty of the city, and live in harmony with nature and the city. Therefore, full attention should be paid to the ecological environment and landscape construction on both sides of the South River, following the principle of man and nature getting along harmoniously, keeping nature and returning to nature, so that the urban levee project can become another bright landscape in Fengcheng City.2.3 Reasonable levee layout. The levee layout is directly related to the rationality of the whole project and the function of the completed project, especially on the size of the project investment has a significant impact. The arrangement of levee should be based on the flood control planning, topography, terrain, geomorphology and geological conditions, combined with the location of existing and proposed buildings, type, construction conditions and historical evolution of the river, fully estimated geological conditions of the underlying layer, after technical and economic evaluation of comprehensive analysis to determine. 2.4 Combined with urban infrastructure planning. In the past, in the urban planning, urban construction department is responsible for urban drainage, road planning, water conservancy department is responsible for river flood control planning, artificially will be urban drainage, road planning and urban flood control planning diametrically separated. Many loopholes often appear in the places where the two parts are interconnected, and they cannot be well integrated with each other. Urban flood control planning and urban infrastructure planning need to be considered in a comprehensive manner and arranged in an integrated manner. Embankment construction should be combined with the consideration of urban drainage projects, sewage projects, roads and urban flood control projects.
3 Fengcheng City South River embankment design examples
3.1 The main task of this project. The main task of this project is to improve the flood control system of the urban section of South River in Fengcheng City and improve the flood control capacity through the construction of this project, which is connected with the levees that have been constructed upstream and downstream of the South River. The left and right banks of Nanda River are strengthened with embankment, constructed with first-step retaining wall and buildings through the embankment in a coordinated manner, so as to meet the requirements of flood prevention, flood discharge, and protection of grooves and solid beaches, to improve the overall flood control capacity of the basin, to protect the safety of people's lives and properties, and to improve the ecological environment of the basin.3.2 Flood control standard and scale. This project builds the left bank of South River to protect Phoenix City Street and the right bank to protect Fengshan Street. The total population of Phoenix City Street is 112,100, of which 95,400 are non-agricultural, and the total population of Fengshan Street is 48,900. According to the current national standard "Flood Control Standard" GB50201-94: when the city's non-agricultural population ≤ 200,000 people, the importance of the city as a general town, the city grade Ⅳ, flood control standards for 50 ~ 20 years. The construction of the left bank of the South River *** there are 11 enterprises, including Fengcheng City old cellar factory for the national medium and second-type enterprises, but also includes Fengcheng City Weaving Factory, Liaodong Instrumentation Factory, Silk Factory, Phoenix Chemical Group, etc. *** there are 2 schools, respectively, for the Chengdong Elementary School and the city's Agricultural Mechanical School, the hospital 1 for the Fengcheng City Orthopaedic Hospital, Fenghuangshan Road and Fenghua Road crossing the district, but also according to the Fengcheng City City, Chengdong New District Planning Map, the left bank of the flood prevention district 15 areas for planning, mainly administrative offices, CBD business district, cultural services area, covering an area of about 3.67km2.
Right bank *** there are three enterprises, respectively, Yifo Industrial Company Limited, Schenker, storage battery factory, Fengshang Railway is located in the right bank behind the embankment, parallel to it. According to the current national standard "flood control standards" GB50201-94: when the industrial and mining enterprises for medium-sized, industrial and mining enterprises grade Ⅲ, flood control standards for 50 ~ 20 years. According to the "Ai River Basin Planning Report", Fengcheng City, in accordance with the overall development plan of the city, the flood protection standard for the urban area is one in 50 years. Fengcheng city flood protection standard is 50 years. At the same time, the project design to determine the flood protection standard in accordance with the needs of urban development should also be considered with the upstream and downstream of the built embankment convergence principle for selection. From the above discussion of the protection object can be seen, the right bank flood protection area protection object is less, and less important than the left bank, the upstream has been built embankment has reached the 30-year flood standard, according to the principle of upstream and downstream convergence, the right bank flood protection area flood protection standard according to the 30-year design; left bank flood protection area according to the Fengcheng City City, the East New District planning, the protection object is more important, flood protection standard according to the design of the 50-year flood standard.
Summary of the selected, the project design of the left bank flood protection area flood protection standard 50 years, the right bank flood protection area flood protection standard 30 years. Through the embankment buildings are mainly to drain rainwater, according to "urban flood control engineering design specifications" (GB/T50505-2012), the design of buildings through the embankment rainwater return period are selected 5 years. The length of the center line of this project is about 3.5km. both sides of the river *** need to build soil embankment length of 6580m, of which the new embankment 2361m, heightening and thickening embankment 2749m, need to repair the embankment 1470m. *** construction of a first-class concrete gravity retaining wall bank protection 6919m. second-class step retaining wall bank protection 6919m, the construction of three-stage step retaining wall bank protection 6919m. 3.3 Embankment line arrangement. This water conservancy project design embankment line and the first-step retaining wall bank shoulder line should follow the principle of nature according to the relevant requirements of water conservancy project, the bank shoulder line is arranged at the junction of the main river channel and the beach, and the channel width of the original main river channel is not destroyed for the arrangement. The space between the embankment and the first-step retaining wall should be arranged according to the landscape design requirements of the second-step and third-step retaining wall shoulder line, according to the vertical elevation of the site, you can consider the formation of a water body, plaza, road, green space at several levels.3.4 Embankment type design. According to the current commonly used masonry materials combined with the specific conditions of this project to draw up straight wall type bank protection using gabion gabions, concrete gravity retaining wall and concrete cantilever retaining wall three forms for comparison. The final levee design using gravity concrete flood wall, and combined with the requirements of the urban landscape, the gravity flood wall to build two layers of steps for landscape green design. This will prevent the river from scouring and reduce the levee's occupancy of the river, while facilitating the design of the landscape hierarchy.
City embankment project is an important part of the overall construction of the city, the city embankment project construction to give full consideration to the requirements of urban construction, urban construction engineering layout must be subordinate to the overall urban construction planning and urban flood control planning, the two need to be considered in a comprehensive manner, the overall arrangement.
The above is collected and organized by Zhongda Consulting
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