Dam uplift pressure monitoring device

Abstract

The utility model provides a dam uplift pressure monitoring device which comprises a pipe orifice device and a pressure measuring pipe which are connected up and down, and the pipe orifice device is composed of an upper half part and a lower half part which are communicated up and down; the upper half part is composed of a vertical pipe and a transverse pipe, the upper end of the vertical pipe is provided with a liquid level pipe connector and an osmometer cable outlet, an osmometer is arranged in the vertical pipe, the inner end of the transverse pipe is communicated with the side face of the vertical pipe, the outer end of the transverse pipe is a pressure meter connector, the lower half part is in threaded connection with the upper end of the pressure measuring pipe, the connecting position is wrapped with a raw material belt, and connector water stop sealing is conducted; the liquid level pipe connector is connected with the lower end of the liquid level pipe, a cable of the osmometer is led out of the osmometer cable outlet, and the pressure meter connector is provided with a pressure meter. The dam uplift pressure detection device has the beneficial effects that the structure is ingenious, the dam uplift pressure can be monitored, and the detection device can be calibrated, so that the accuracy of actual monitoring is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy engineering, and in particular to a dam uplift pressure monitoring device. Background Art

[0002] Uplift pressure is a vertical upward force on the gravity dam body. It reduces the effective pressure exerted by the gravity dam on the foundation, thereby reducing the anti-slip force at the dam bottom. In the safety monitoring of concrete gravity dams, dam foundation uplift pressure is a very important monitoring item.

[0003] Currently, uplift pressure is typically monitored by embedding a piezometer (also known as a pressure gauge) within the dam foundation. Because piezometers can experience zero drift over time, or other factors can lead to unstable or abnormal readings, a pressure gauge must be installed simultaneously for comparative readings. In actual monitoring, discrepancies between the piezometer and pressure gauge readings are common, necessitating the development of a dam uplift pressure monitoring device with calibration capabilities. Summary of the Invention

[0004] In order to solve the above problems, the present invention discloses a dam uplift pressure monitoring device.

[0005] The specific plan is as follows:

[0006] A dam uplift pressure monitoring device includes a nozzle device and a pressure measuring tube connected in upper and lower parts, the nozzle device consists of an upper half and a lower half connected in upper and lower parts; the upper half consists of a vertical pipe and a horizontal pipe, wherein the upper end of the vertical pipe is provided with a liquid level pipe interface and a piezometer cable outlet, an osmometer is provided inside, the inner end of the horizontal pipe is connected to the side of the vertical pipe, and the outer end is a pressure gauge interface, the lower half is threadedly connected to the upper end of the pressure measuring tube, and the connection is wrapped with raw tape to ensure a water-stop seal for the joint; the liquid level pipe interface is connected to the lower end of the liquid level pipe, the cable of the piezometer is led out from the piezometer cable outlet, and the pressure gauge interface is installed with a pressure gauge.

[0007] Furthermore, the lower end of the pressure measuring tube is drilled from the corridor bottom plate to the dam foundation to ensure that the seepage at the downstream dam foundation can enter the pressure measuring tube. The piezometer is used to monitor the pressure head in the pressure measuring tube, thereby calculating the uplift pressure.

[0008] Furthermore, the upper half and the lower half of the nozzle device are connected by a flange.

[0009] Furthermore, a three-way six-branch pipe for installing the pressure gauge is provided at the pressure gauge interface. The two ends of the three-way six-branch pipe are respectively connected to the outer end of the horizontal pipe and the pressure relief valve through the six-branch pipe. The pressure relief valve is used to drain water when installing or removing components.

[0010] Furthermore, the surface of the liquid level tube is engraved with millimeter-level scales for realizing millimeter-level liquid level readings. After being led out from the nozzle device, the liquid level tube is installed vertically against the corridor wall.

[0011] Furthermore, the liquid level tube is divided into two working states, including uplift pressure monitoring and uplift pressure calibration; wherein, during uplift pressure monitoring, the liquid level tube mouth is in an open state, and its liquid level reflects the size of the water head in the pressure measuring tube; during uplift pressure calibration, the liquid level tube mouth is connected to the boosting device and is in a sealed state, and the pressure of the boosting device is compared with the measured values ​​of the pressure gauge and the piezometer. If the pressure values ​​of the three change in the same way, it means that calibration has been completed, otherwise correction is made based on the confidence level of the boosting device pressure value > pressure gauge > piezometer.

[0012] The beneficial effects of the present invention are: the structure is ingenious, not only can the uplift pressure of the dam be monitored, but the detection device itself can also be calibrated, thereby effectively improving the accuracy of actual monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the overall structure diagram of the device.

[0014] Figure 2 This is a schematic diagram of the liquid level pipe when the device is performing uplift pressure monitoring.

[0015] Figure 3 This is a schematic diagram of the device during lift pressure calibration.

[0016] List of reference numerals:

[0017] 1-pressure measuring tube, 2-upper part, 3-lower part, 4-liquid level pipe interface, 5-piezometer cable outlet, 6-piezometer, 7-liquid level pipe, 8-pressure gauge, 9-corridor floor, 10-flange, 11-three-way six-branch pipe, 12-six-branch pipe, 13-pressure relief valve, 14-boosting device. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0019] As shown in the figure, the present application provides a dam uplift pressure monitoring device, including a pipe mouth device and a pressure measuring tube 1 connected in upper and lower parts, the pipe mouth device consists of an upper half 2 and a lower half 3 connected in upper and lower parts; the upper half 2 consists of a vertical pipe and a horizontal pipe, wherein the upper end of the vertical pipe is provided with a liquid level pipe interface 4 and a piezometer cable outlet 5, and a piezometer 6 is provided inside, the inner end of the horizontal pipe is connected to the side of the vertical pipe, and the outer end is a pressure gauge interface, the lower half 3 is threadedly connected to the upper end of the pressure measuring tube 1, and the connection is wrapped with raw tape to ensure a water-stop seal at the joint; the liquid level pipe interface 4 is connected to the lower end of the liquid level pipe 7, the cable of the piezometer 6 is led out from the piezometer cable outlet 5, and the pressure gauge interface is installed with a pressure gauge 8.

[0020] In this embodiment, the lower end of the pressure measuring tube 1 is drilled from the corridor bottom plate 9 to the dam foundation to ensure that the seepage at the downstream dam foundation can enter the pressure measuring tube. The piezometer 6 is used to monitor the pressure head in the pressure measuring tube 1, thereby calculating the uplift pressure.

[0021] In this embodiment, the upper half 2 and the lower half 3 of the nozzle device are connected by a flange 10 .

[0022] In this embodiment, a three-way six-branch pipe 11 for installing the pressure gauge 8 is provided at the pressure gauge interface. The two ends of the three-way six-branch pipe 11 are respectively connected to the outer end of the horizontal pipe and the pressure relief valve 13 through the six-branch pipe 12. The pressure relief valve 13 is used to drain water when installing or removing components.

[0023] In this embodiment, the surface of the liquid level tube 7 is engraved with millimeter-level scales for realizing millimeter-level liquid level readings. After being led out from the nozzle device, the liquid level tube 7 is installed vertically against the corridor wall.

[0024] Liquid level tube 7 operates in two modes: monitoring and calibrating pressure. During pressure monitoring, the tube 7 is open, and its liquid level reflects the head pressure within pressure gauge 1. During pressure calibration, the tube 7 is sealed and connected to a pressure booster 14. The pressure at the booster 14 is compared with the pressure gauge 8 and piezometer 6. If the three pressures change in unison, calibration is complete. Otherwise, a correction is made based on the confidence level of the pressure at the booster 14 > the pressure gauge 8 > the piezometer 6. The booster is an air pump, but those skilled in the art may also choose other boosting devices.

[0025] During the pressure calibration, the booster device increases the pressure in the liquid level tube. Since the liquid level tube is connected to the pressure measuring tube, its pressure is simultaneously increased to the piezometer and pressure gauge. By observing and recording the increased pressure of the piezometer and pressure gauge, it can be judged whether the instruments and meters are working properly.

[0026] The specific judgment method is: statistically compare the air pump pressure with the measured values ​​of the pressure gauge and osmometer. If the pressure values ​​of the three change in the same way, the pressure monitoring system is operating normally and the measured values ​​are true and reliable. If the data of the three are inconsistent during the calibration process, corrections are made based on the confidence level of air pump pressure value > pressure gauge > osmometer.

[0027] The technical means disclosed in the solutions of the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A dam uplift pressure monitoring device, characterized by: The invention comprises a nozzle device and a pressure measuring tube (1) connected in an upper and lower manner, wherein the nozzle device is composed of an upper half (2) and a lower half (3) connected in an upper and lower manner; the upper half (2) is composed of a vertical tube and a horizontal tube, wherein the upper end of the vertical tube is provided with a liquid level tube interface (4) and a piezometer cable outlet (5), an osmometer (6) is provided inside, the inner end of the horizontal tube is connected to the side of the vertical tube, and the outer end is a pressure gauge interface, the lower half (3) is threadedly connected to the upper end of the pressure measuring tube (1); the liquid level tube interface (4) is connected to the lower end of the liquid level tube (7), the cable of the piezometer (6) is led out from the piezometer cable outlet (5), and the pressure gauge interface is installed with a pressure gauge (8).

2. A dam uplift pressure monitoring device according to claim 1, characterized in that: The lower end of the pressure measuring tube (1) is drilled from the gallery bottom plate (9) to the dam foundation to ensure that the seepage at the downstream dam foundation can enter the pressure measuring tube. The piezometer (6) is used to monitor the pressure head in the pressure measuring tube (1) to calculate the uplift pressure.

3. The dam uplift pressure monitoring device according to claim 1, characterized in that: The upper half (2) and the lower half (3) of the nozzle device are connected via a flange (10).

4. The dam uplift pressure monitoring device according to claim 1, characterized in that: The pressure gauge interface is provided with a three-way six-branch pipe (11) for installing the pressure gauge (8), and the two ends of the three-way six-branch pipe (11) are respectively connected to the outer end of the horizontal pipe and the pressure relief valve (13) through the six-branch pipe (12), and the pressure relief valve (13) is used for drainage.

5. The dam uplift pressure monitoring device according to claim 1, characterized in that: The surface of the liquid level tube (7) is engraved with millimeter-level scales for realizing millimeter-level liquid level readings. After being led out from the nozzle device, the liquid level tube (7) is installed vertically against the corridor wall.

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