River channel segmental desilting construction method

Abstract

The invention discloses a river channel segmental desilting construction method, and belongs to the technical field of river channel regulation. According to the river channel segmental desilting construction method, a river channel is segmented, flexible dams are constructed respectively, silt deposition ditches are excavated in front of dam bodies, and silt at the bottom of the river channel is treated by using the water head difference generated after dam construction and water flow impact force generated after water gates are opened for drawing off water. The structural form of the self-floating type dam bodies is adopted in the river channel segmental desilting construction method, the flexible dams can descend automatically according to variations of the river water level, then segmental treatment is conducted, and therefore deposition conditions of the silt can be improved easily; the drainage gates are used in cooperation with the segmental silt deposition ditches, so that the silt deposition efficiency is improved while the water is drained; net-shaped cover plates are arranged above the silt deposition ditches to be used for shielding impurities and protecting personal security; inorganic composite agents are added for conducting innocent treatment on the silt, so that secondary pollution is prevented from being caused to the environment in the process of recycling the soil body; water drainage and solidification of the silt are accelerated, so that the treatment efficiency of the silt is improved.

Description

technical field [0001] The invention belongs to the technical field of river course regulation, and in particular relates to a construction method for segmental dredging of a river course. Background technique [0002] my country's water environment is facing various pressures such as water pollution, water resource shortage, and flood disasters. Water pollution has exacerbated the shortage of water resources, and the destruction of the water ecological environment has led to frequent floods. Water pollution mainly comes from the development of human society, including pollutants produced in various aspects of industry, agriculture, and life. To solve water pollution, on the one hand, it is necessary to control pollution from the source, on the other hand, it is necessary to Development of decontamination technology. Water pollution is mainly reflected in river pollution. Polluted rivers not only lose their resource functions and use value, but also seriously damage the su...

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Problems solved by technology

[0003] If the traditional water conservancy engineering technology and equipment are used for river dredging, the energy consumption is high, the efficiency is low, and the construction is slow. Therefore, people are constantly developing various effective, practical, and operable river dredging technologies.

There are the following methods in the prior art: 1) The technology of regularly cleaning the bottom mud of the river channel by setting deep trenches in sections and building rubber dams, but the rubber dams are not easy to build and belong to fixed-point projects, and the dredging of the entire river channel cannot be carried out. The sludge is simply air-dried, which takes a long time, and the pollutants in the sludge are not harmlessly treated, which may easily lead to secondary pollution of the surrounding sites during use; Earth dam, the method of cleaning pollutants, this method is difficult to construct, inconvenient to operate, and takes a long time to process, and the effectiveness and durability of its treatment cannot be guaranteed; 3) Use a booster device (large water pump) in the upper reaches of the river to flush the river sediment , change the low-quality physical structure, and at the same time use the mesh filter method to discharge the fine silt in the lower reaches of the river, filter out white garbage plastics and large-pollution bottoms, modify them and recycle them for resource utilization. This method needs to set up booster devices in sections , and need to work for a long time, there is no special silt collection system, the processing time and cost are high, the treatment of silt is not obvious, and it is helpful to the change of water ecology; 4) The method of using mechanical equipment to clean river silt, Although these methods are simple in structure and easy to operate, their repair and maintenance costs are high during use. Due to the large size of the mechanical equipment itself, it can only be applied to wide and deep rivers, and is not suitable for shallow and narrow rivers.

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