A rotary-occupied river bed sediment sampling device under the action of its own weight

Abstract

The invention discloses a rotary bank-off advancing type riverbed deposit sampling device under a self-weight effect. The device comprises a liftable operating platform, a power system, a transmission rod and a sampling tube system, wherein the liftable operating platform is fixed to the side face of a surveying vessel; the power system is arranged on the liftable operating platform; the upper end of the transmission rod is arranged in a hole of the power system through a master bushing and is in drive connection with the power system; the lower end of the transmission rod is connected with the sampling tube system; the power system transmits a shear force to the sampling tube system through the transmission rod; the self-weight of the whole transmission rod and that of the sampling tube system are adopted as drilling pressure to drill to a sampling position, and finally the whole sampling tube system is lifted to the surveying vessel to complete sampling work. The device is simple in structure, convenient to disassemble, and suitable for deepwater sampling in a water reservoir, and can prevent a deposit sample from being disturbed.

Description

technical field [0001] The invention relates to the field of water conservancy measurement, in particular to a rotary encroaching river bed sediment sampling device under the action of its own weight. Background technique [0002] With the operation of the Three Gorges Reservoir, there is a large amount of silt on the riverbed, so it is particularly important to study the basic characteristics of the silt. For example, the dry bulk density of sediment is directly related to the calculation of reservoir sediment volume; the change of pollutants such as nitrogen and phosphorus attached to sediment is closely related to the water ecology of the middle and lower reaches of the Yangtze River; An important factor in gradation; the rheological properties of floating mud will directly affect navigation. High-fidelity sampling of reservoir bed sediment is a prerequisite for studying its basic characteristics such as dry bulk density. [0003] At present, the gravity sampler is main...

AI Technical Summary

Problems solved by technology

Due to the high-speed penetration of the gravity sampler into the river bed, a large shear force will be generated between the sampling cylinder and the river bed sediment to deform the sediment sample, which cannot achieve the fidelity effect, and its sampling depth is difficult to control

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