A method and device for measuring the height of the piezometer water level from the piezometer nozzle

Abstract

The present invention discloses a method and device for measuring height of distance between a piezometric tube level and a piezometric tube orifice. Measurement of a non-pressure water level and a pressured water level is completed through a pressure sensor. During measurement of the non-pressure water level, a pipe thread blind hole of a choke plug is screwed on pipe threads of the piezometric tube orifice, height of the pressure sensor is adjusted by pulling up and lowering a leading line of the chock plug so as to enable the pressure sensor to be fully immersed under a water surface inside a piezometric tube, a scale value H2 on the leading line is recorded, a water level height H1 measured by the pressure sensor is read, and a height difference [delta]H of the water level in relative to the orifice is calculated, that is, [delta]H=H1-H2. During measurement of the pressured water level, a stud at the top part of the pressure sensor is screwed into a stud hole on the chock plug, the chock plug is screwed onto the pipe threads of the piezometric tube orifice, the scale value H2 on the leading line is recorded, a water level height H1 measured by the pressure sensor is read, and a height difference [delta]H of the water level in relative to the orifice is calculated, that is, [delta]H=H1-H2. The method and the device are simple in structure and convenient to operate.

Description

technical field [0001] The invention relates to a method and a device for measuring the height of a piezometer water level from a piezometer nozzle, and belongs to the technical field of dam seepage monitoring. Background technique [0002] In the field of dam seepage monitoring, the piezometer is a water level monitoring interface, and the seepage of the dam is monitored according to the change of the water level in the piezometer. When the water level is below the orifice of the piezometer tube, it is called the no-pressure water level. At present, the water level gauge is used to measure the no-pressure water level directly; At the orifice of the piezometric tube, it is called the pressurized water level at this time. At present, for the measurement of the pressurized water level, a pressure gauge is installed at the orifice of the piezometric tube through an interface device to measure the water pressure in the piezometric tube, and then the water pressure measured by t...

AI Technical Summary

Problems solved by technology

[0003]The existing measurement methods have the following problems. First, because the water level in the piezometric tube often changes frequently between pressure and no pressure, it is necessary to measure The interface device and pressure gauge are often disassembled, which increases the workload of observation; second, there are multiple piezometric tubes on the dam, and each piezometric tube opening needs to be installed with an interface device and a pressure gauge, which is expensive; third, during construction , interface devices and pressure gauges are easily damaged by civil construction, increasing the maintenance workload of interface devices and pressure gauges

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