Reservoir dredging method

Abstract

The invention discloses a reservoir dredging method, and relates to a dredging method. The a reservoir dredging method comprises step I: closing a water inlet gate of a reservoir and opening a water outlet gate of the reservoir at the same time; step II: flushing sludge to the water outlet gate of the reservoir by using clean water sludge flushing devices, so that part of the upper-layer sludge can be flushed out of the reservoir; step III: digging a sludge-accumulated pit at the bottom of the reservoir, and enabling a siphon pipe of a siphon device to extend into the bottom of the sludge-accumulated pit; step IV: pushing the upper-layer sludge into the sludge-accumulated pit by utilizing a bulldozer, and then pumping out the upper-layer sludge accumulated in the sludge-accumulated pit byutilizing the siphon device; step V: digging out the lower-layer sludge by using an excavator and conveying the dug-out lower-layer sludge to a dump; and step VI: backfilling clay into the reservoir,and filling the clay layer to the bottom of the reservoir to a certain height to make the reservoir meet the volume capacity. The reservoir dredging method has the effect of accelerating the upper-layer sludge dredging speed.

Description

technical field [0001] The present invention relates to a kind of dredging method, more specifically it relates to a kind of reservoir dredging method. Background technique [0002] Most of the existing reservoirs are built in valleys or barrages. This kind of reservoir construction requires a huge investment. When the reservoir is in operation, because the upstream river continuously transports sand to the reservoir, within a certain period of time, the silted sand will silt up the reservoir. As a result, the reservoir is scrapped. In order to ensure the smooth flow of the reservoir and the water storage capacity, regular dredging of the reservoir is a necessary project. Existing reservoirs are generally divided into large reservoirs and small reservoirs. The commonly used dredging methods are generally hydraulic Method dredging and dry dredging method. [0003] Among them, hydraulic dredging mainly refers to the dredging of reservoirs by hydraulic methods, which is the mo...

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Problems solved by technology

[0002] Most of the existing reservoirs are built in valleys or barrages. This kind of reservoir construction requires a huge investment. When the reservoir is in operation, because the upstream river continuously transports sand to the reservoir, within a certain period of time, the silted sand will silt up the reservoir. As a result, the reservoir is scrapped. In order to ensure the smooth flow of the reservoir and the water storage capacity, regular dredging of the reservoir is a necessary project. Existing reservoirs are generally divided into large reservoirs and small reservoirs. The commonly used dredging methods are generally hydraulic Method dredging and dry dredging

[0003] Among them, hydraulic dredging mainly refers to the dredging of reservoirs by hydraulic methods, which is the most commonly used method. However, dredging can only carry out limited control over dredging, and a drainage system must be pre-set in the sediment. The sand flushing method is usually effective, but the disadvantage of these methods is that it consumes a lot of water, and it is necessary to ensure the refilling of the reservoir; and the dry dredging method is to use an excavator after the reservoir is completely emptied. For dredging, it is easy to grasp the amount of dredging by using this method, and the cleared sludge can be directly transported and stacked, and the reservoir must stop running during the entire dredging process; the comparison of the above two schemes shows that this method is suitable for all kinds of small reservoirs ; and the existing towns generally require the establishment of small reservoirs, so the dry dredging method is more widely used

[0004] However, the dry dredging method is used for dredging by excavating silt excavators, and the silt in many existing reservoirs is generally divided into lower layer silt and upper layer silt, and the lower layer silt is formed by the sedimentation of solid particles. The solid-liquid mixture of a small amount of liquid is shaped like ooze, slush or mud, so it has a strong viscosity, and the upper layer of silt is usually in a flow-plastic shape due to long-term immersion in water, with poor stability and strong fluidity. Therefore, the silt excavated by the excavator at one time will generally flow out a lot, resulting in the use of dry dredging method to spend more time when cleaning the upper layer of silt

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