Yangtze River Waterway Bureau cracks the technical problems of flood construction

The practice of the Yangtze River Channel Reconstruction Project, which has lasted for more than 50 years, cannot be constructed. It was recently broken by the Yangtze River Channel Bureau. During the middle flood period of this year, the channel retreat of the Yangtze River Xuanyu section, the construction site of the Taiziji Reef Project, and the construction site of the Dongliu Channel Improvement Project are undergoing dredging, drilling and blasting construction in an orderly and orderly manner. This is the first time that the Yangtze River Channel Improvement Project has been constructed in the middle flood.

According to the past practice, the Yangtze River waterway improvement project is a dry season construction. By the end of May each year, various types of waterway remediation construction will be suspended. Because the Yangtze River entered the mid-flood period in June, the water level is high and the flow velocity is large, and the construction is affected by factors such as technology and safety. The waterway rectification entered the idle period.

In recent years, the Yangtze River Waterway Bureau has carried out scientific and technological research on this problem and solved the technical problems of flood construction. The Chongqing Waterway Engineering Bureau, a construction unit under the Yangtze River Waterway Bureau, took the lead in exploring the technical difficulties of the construction of the flood. According to the on-site construction personnel, they solved three technical problems during the construction: First, the problem of “returning silt” in dredging construction during the flood period in the upstream. In the waterway improvement project of the Xuanyu section of the Yangtze River, the Chongqing Waterway Engineering Bureau learned to grasp the movement law of the pebble in the flood season, and divided the construction area into two sections, one by one from deep to shallow, to avoid back silting; The problem of flow rate damage. In the drilling and blasting construction of Taiziji in the lower reaches of the Yangtze River, they adopted a construction scheme to reduce the number of drilled rows, effectively avoiding the influence of large flow rate on the blasting network. Third, it adopted an ultra-deep construction method to overcome the dredging of the rope bucket. The "floating" phenomenon caused by the large flow rate during the construction of the ship. Due to the fluctuations and frequent fluctuations of the flood water level in the middle, the traditional way of setting up the ship on the shore for ship positioning construction can not meet the requirements of the medium flood construction. Therefore, they have adopted advanced technology such as GPS positioning system and depth sounder in construction, increasing the density of underwater measurement and mapping, and constantly correcting ultra-deep values ​​to ensure construction quality.

The practice of breaking the construction of floods in the middle of the flood means that the construction tasks of the Yangtze River channel remediation in the two dry seasons can now be completed within one year, and the channel that is conducive to remediation will be put into use in advance, which will further accelerate the “deep downstream and smooth middle reaches of the Yangtze River channel”. The extension of the “upstream” construction will create favorable conditions for the creation of the Yangtze River Golden Waterway.

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