Nanjing to promote 373 flood prevention and disaster relief projects to build dikes "long" 1.5 meters

Last year, our city was hit by the major floods in the Yangtze River Basin since 1998. In accordance with the general requirements of "reflection after the major disaster, reflection after the great dry", the city is now trying its best to promote the construction of flood control and disaster relief projects. March 9, the reporter came to one of the city's key risk elimination projects, Lishui District, new bridge River site site visit, everywhere felt the roar of the motor, mechanized construction to catch up with the progress, the construction period of the operation scene.

"One river spans two towns and the construction site stretches for eight kilometers." Lishui District Water Bureau Prevention Office Section chief Wang Ping introduced, the new bridge River is flowing through Jingqiao, and Feng two towns of a backbone river, originated from the hills and mountains, upstream there are 3 medium-sized reservoirs, downstream into the city's largest Shiwu Lake. Last year, the local encountered heavy rainfall, Shijiu Lake water level exceeded the record high, plus You 3 reservoirs above the warning water level opened the sluice discharge, Xinqiao River water level skyrocketed, up to 13.09 meters, more than the record high level of 0.38 meters, river levees appeared different degrees of leakage, collapse, scattered flooding and other dangerous. The field investigation after flood season found that there are some problems in Xinqiao River, such as lack of embankment elevation, poor compaction of the embankment, close to the dam behind the embankment and thin embankment, which directly affect the flood control safety of the basin. This year, the new Bridge River has been identified as the city's key risk elimination project, through the river dike increased 1.5 meters, as well as thickening and widening, "the flood control capacity of the river from 20 years to 40 years, double the flood control capacity." Wang Ping said.

Drilling RIGS drilling, excavators waving long arms, heavy earth-moving trucks shuttling back and forth, bulldozers leveling operations... Reporters on the scene saw that on the busy construction site, standing a huge sign, above write a big "90 days" number, the construction period from February 12 to May 13, 2017. The total length of the river embankment construction is 8 kilometers, with a total investment of 46 million yuan. He worked from 6 a.m. to 6 p.m. every day on weekends and holidays to ensure that the flood season would be completed before the end of May. At present, the biggest difficulty is that the local is a polder area, there is no soil source, reinforcement of river embankments, ponds and solid foundation of the loess from ten kilometers of soil field by big trucks.

How to ensure project quality under tight schedule? Li Zongchao, deputy director of the city's defense office, said that all flood control and protection works in addition to the construction period, but also to ensure quality, never allow corners to be cut. For example, every layer of loess in Xinqiao River embankment is 0.4 to 0.5 meters high, and the bulldozer must be repeatedly rolled to meet the design density requirements. Another example is the drill in the levee mixing pile machine operation, the cement mortar into the embankment, block the gap, the leak, to achieve the anti-leakage effect, the number of drilling, distance, depth, each hole grouting mortar amount are supervised by the site, to ensure that the quality of the project meets the requirements, withstand the flood test, can not be careless.

New bridge River site, just a miniature of the construction of flood control and insurance works in our city. It is understood that in 2016, the flood season, the city has a city-wide flood, the city a total of landslide, piping, leakage, overflow and other degrees of water conservancy project danger 704. The city plans to use two years to complete 373 water conservancy insurance projects, estimated total investment of 1.6 billion yuan. By the end of February, the need to complete the flood before 253 water conservancy insurance projects have all started construction, the overall image of the progress of about 30 %, to ensure that the flood season at the end of May before the completion. Of the 120 water conservancy insurance elimination projects implemented in the second half of this year, 23 have been approved, 11 have been started, and the rest are in the process of program design.

Source: Nanjing Nanbao online, March 9, 2017