Floating water level measurement instrument for rock engineering investigation, and measurement method thereof

Abstract

The invention relates to a floating water level measurement instrument for rock engineering investigation, and a measurement method thereof. The floating water level measurement instrument for rock engineering investigation comprises support frames, a pullback device, a rocker type winding reel, a measurement rope, a floating mark and a gravity drag reduction head; the pullback device is connectedbetween the support frames; the upper end of the support frame is installed with the rocker type winding reel through a bearing; the measurement rope is wound on the rocker type winding reel; the lower end of the measurement rope is connected with the gravity drag reduction head; the floating mark is put on the gravity drag reduction head; and furthermore, the floating marker sleeves the measurement rope. The floating water level measurement instrument for rock engineering investigation, and the measurement method thereof in the invention can solve the following problems: when water level measurement is carried out, a measurement head can meet with resistance by entering water; therefore, deviation exists between the fall point position and the predetermined position of the measurement head; the error of a measurement value is relatively high due to increasing of the released rope; because the sinking speed of the measurement head is relatively rapid, when the measurement head sinks to the lowest end of a drill hole, too many released ropes exist due to continuous rotation of winding reel by inertia, etc.

Description

technical field [0001] The invention relates to the field of rock engineering survey, in particular to a floating water level measuring instrument for rock engineering survey and a measuring method thereof. Background technique [0002] Groundwater refers to the water that exists in the rock voids below the ground. In geotechnical engineering investigation, it is often necessary to measure the water level and depth of groundwater. Usually, before the measurement of the water level depth of the groundwater, it is often necessary to drill holes in the survey site to increase the gap between the rocks, and then extend the measuring head into the groundwater to measure the water level. However, during the measurement process , often encounter the following problems: [0003] 1. Since the measuring head will encounter certain resistance when it enters the water, there will be a deviation between the position of the measuring head and the predetermined position, which will increa...

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Problems solved by technology

[0006] The present invention can solve the problem that when the measuring head enters the water, it will encounter a certain resistance, resulting in a deviation between the position of the falling point of the measuring head and the predetermined position, so that the length of the pay-off line increases and the error of the measured value is large. Due to the fast sinking speed of the measuring head, when the measuring head sinks to the lowest end of the borehole, the reel will continue to rotate due to inertia, resulting in excessive pay-off, which affects the measurement of the later water level and other problems.

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