CN101806608B - A seepage and seepage pressure monitoring device - Google Patents

Abstract

The invention provides a seepage flow and seepage pressure monitoring device, which belongs to the technical field of the safety monitoring of the reservoir dam. The invention is characterized in that the upper end of a water level sensor is connected with a control box to form the reservoir dam seepage flow and seepage pressure monitoring device; the water level sensor consists of a twin-core cable which is externally coated with a waterproof dermic layer; the cross section of the twin-core cable is of a infinity shape; the control box consists of a signal acquisition unit, a microprocessor, a wireless communication module, a battery pack and a voltage conversion unit; the signal acquisition unit can convert water level information and environment temperature information into digital information; the microprocessor can correct and calculate the digital information; the wireless communication module can send out water level calculation information; and the voltage conversion unit can carry out boosting conversion on the voltage of the battery pack and carry out real-time monitoring on the electric quantity of the battery pack. During monitoring, the device is arranged in a piezometer tube inserted into the dam body of the reservoir dam to carry out monitoring.

Description

A seepage and seepage pressure monitoring device

technical field

The invention belongs to the technical field of reservoir dam safety monitoring, and in particular relates to a seepage and seepage pressure monitoring device of a reservoir dam.

Background technique

Safety monitoring of reservoir dams is a very important task. The seepage and seepage pressure of dams is one of the important indicators to measure the safety degree of reservoir engineering operation, which is generally realized by monitoring the water level.

At present, there are many methods for monitoring the water level of reservoir dams at home and abroad, among which there is a floating ball measurement method, which has frequently moving mechanical parts, which is not conducive to accurate measurement of the water level, and has poor long-term stability; the patent No. ZL94203512.7 is disclosed A piezometric tube water level detector, mainly composed of mechanical components such as stepping motors, has low measurement accuracy and reliability; the commonly used measurement method of measuring water level by water pressure at present must include sensors with electronic devices Soaked in water for a long time, it is easy to get water, condensation or moisture, once the water gets in, the sensor will completely fail; the patent No. ZL200710067265.3 discloses a method of measuring water level using a distributed optical fiber temperature sensor, this method costs Higher, an ordinary reservoir dam needs dozens or even hundreds of piezometric tubes, which is difficult to popularize and use; the method of measuring water level with coaxial capacitive sensor is only suitable for the measurement of water level in water storage equipment, not It is suitable for water level measurement of reservoir dams; the patent number is ZL200920051119.6, which discloses a wireless seepage pressure monitoring system for reservoir dams. Although the system is used for reservoir dam monitoring, its structure is complex and the cost is high.

Contents of the invention

The purpose of the invention is to provide a monitoring device with a new structure for measuring the seepage and seepage pressure of a reservoir dam, which can overcome the shortcomings of the prior art.

The present invention is realized in this way: it includes a control box composed of a water level sensor and a plurality of monitoring modules, and its structural feature is two parallel cables arranged side by side. The upper end of the water level sensor composed of the ∞ waterproof cortex of the ditch is composed of a signal acquisition unit that can convert water level information and ambient temperature information into digital information, a microprocessor unit that can correct and calculate the digital information converted from water level information, The wireless communication module unit that can send out the water level calculation information, the battery pack unit and the control box composed of the voltage conversion unit that can boost the voltage of the battery pack and monitor the battery power in real time are connected to form a reservoir dam seepage seepage The pressure monitoring device is installed in the piezometric tube embedded in the dam body of the reservoir to implement the monitoring function.

The working principle of the present invention is: the water level sensor with waterproof cortex converts the water level change into a capacitance signal, and the capacitance signal is converted into a digital signal by the signal acquisition unit and then sent to the microprocessor unit together with the ambient temperature. The obtained capacitance value is subjected to linear correction and water level calculation, and the corrected water level value is sent to the wireless communication module unit for real-time transmission.

The present invention has following advantage and positive effect:

1. The structure is simple, the front end is digitized, and the measurement results are accurate;

2. Low cost, conducive to large-scale promotion;

3. Adopt low-power microprocessor and wireless communication module to reduce the overall standby power consumption;

4. The voltage boost circuit is adopted to make full use of the battery power, prolong the service life of the battery, monitor the battery power in real time, and automatically prompt the staff to replace the battery, which is convenient for maintenance;

5. Add temperature compensation to eliminate the influence of temperature changes on the measured value;

6. Adopt wireless communication mode, which is convenient for on-site installation and maintenance;

7. It can be widely used in the measurement of reservoir water level and the measurement of dam seepage and seepage pressure

Description of drawings:

Fig. 1 is a structure and implementation schematic diagram of the present invention;

Figure 2 is a cross-sectional view of the cable of the water level sensor;

Fig. 3 is a block diagram of the internal structure of the control box of the present invention;

Fig. 4 is a circuit connection diagram of the present invention.

In the figure: 1-control box; 2-water level sensor;

3-piezometric tube; 4-reservoir dam;

5-water surface in the reservoir; 6-water level in the piezometric tube;

7, 7'-cable core wire; 8-waterproof cortex;

9-concave groove; 10-signal acquisition unit;

11-microprocessor; 12-wireless communication module;

13-voltage conversion unit; 14-battery pack;

15 - Antenna.

Detailed ways

As shown in Fig. 1, Fig. 2 and Fig. 3: it consists of two cables 7, 7' arranged in parallel and side by side, and the left and right ends of the outsourcing are convex round, and the middle part has a concave groove 9. Infinity waterproof cortex 8 The upper end of the water level sensor 2 is connected with the signal acquisition unit 10 which can convert the water level information and ambient temperature information into digital information, the microprocessor 11 which can correct and calculate the digital information converted by the water level information, and the water level calculation information The wireless communication module 12 sent out, the battery pack unit 14 and the control box 1 composed of the voltage conversion unit 13 that can boost the voltage of the battery pack and monitor the battery power in real time are connected to form the reservoir dam seepage seepage control box 1 of the present invention. The pressure monitoring device is installed in the piezometric tube 3 embedded in the dam body of the reservoir dam 4, the control box 1 is placed on the upper end of the piezometric tube 3, and the water level sensor 2 sinks vertically into the piezometric tube 3. The monitoring work can be carried out in the water in the pressure pipe 3 .

The connection relationship between the monitoring modules in the control box 1 is that the input end of the signal acquisition unit 10 is connected to the upper end of the water level sensor 2, and the output end is connected to the microprocessor 11 with ultra-low power consumption through the I ² C or SPI bus. The output end of the processor 11 is connected with the wireless communication module 12 of low power consumption through the serial communication interface RS232 or RS485, the wireless communication module 12 is also connected with the antenna 15, the input end of the voltage conversion unit 13 is connected with the battery pack 14, and the output end They are respectively connected to the power supply input terminals of the signal acquisition unit 10, the microprocessor 11 and the wireless communication module 12, and the specific connection relationships inside each unit are as shown in Figures 2 and 4:

1) Water level sensor 2

The water level sensor 2 is composed of two parallel core wires 7, 7' and waterproof cortex 8. It is a two-core cable, in which the core wires 7 and 7' are galvanized copper wires, and the waterproof cortex 8 is made of waterproof silicon material. Way, the cross-section of the waterproof cortex 8 is ∞, and the middle part has concave groove 9.

The upper end of the water level sensor 2 is connected to the input end of the signal acquisition unit 10 .

2) signal acquisition unit 10

The signal acquisition unit 10 is composed of a capacitance conversion chip IC1, which adopts a capacitance conversion chip AD7745 with low power consumption, high precision, and the ability to simultaneously convert capacitance signals and ambient temperature.

One end of water level sensor 2 is connected to pin 3 of capacitance conversion chip IC1, the other end is connected to pin 8 of capacitance conversion chip IC1, pin 2 of capacitance conversion chip IC1 is connected to 5V power supply through resistor R201, pin 14 is connected to 5V power supply, and pin 13 is grounded , two capacitors C1 and C2 are connected in parallel between pins 13 and 14, the data signal transmission terminals SCL and SDA of the capacitor conversion chip IC1 are respectively connected to the 5V power supply through resistors R203 and R202, and at the same time, SCL and SDA are respectively connected to the microprocessor IC2 The 11-pin and 13-pin connections.

3), microprocessor 11

Microprocessor 11 is made up of microprocessor IC2, adopts high speed, low power consumption microprocessor PIC16F690. PIC16F690's data signal transmission terminal 11 and 13 are connected to IC1's 1 and 16 through the I ² C bus, PIC16F690's serial port 12 and 10 are connected to the wireless communication module 12's 3 and 4 respectively The 7 pins and 8 pins of the I/O port are connected to the 7 pins and 6 pins of the wireless communication module 12 respectively, and the 17 pins of the non-shielded interrupt of the PIC16F690 are connected to the 3 pins of the high-efficiency boost chip IC4.

4), wireless communication module 12

The wireless communication module 12 is composed of SRWF1208 module.

5), power conversion unit 13

The power conversion unit 13 is composed of a high-efficiency boost chip L6902D. The output terminal of the battery pack 14 is connected to the 7 pin of the L6902D through the inductance L2, the voltage output terminal 8 pin of the L6902D outputs 5V voltage for other circuits, and the low voltage alarm signal LBO of the L6902D is connected to the non-shielding interrupt 17 pin of the PIC16F690.

Claims (2)

1. seepage flow and seepage pressure monitoring device that is used for reservoir dam, comprise level sensor and the control enclosure of forming by a plurality of monitoring modulars, its structural attitude is: by two parallel cables of arranging side by side (7,7 '), its two ends, outsourcing left and right sides are dome, the upper end that there is a level sensor (2) that the ∞ type waterproof cortex (8) of spill groove (9) constitutes at the middle part with water level information can be converted to numerical information, environment temperature can be converted to simultaneously the signal gathering unit (10) of numerical information, can be to the microprocessor (11) of revising and calculating by the numerical information of water level information conversion, the wireless communication module (12) that water level computing information can be sent, battery voltage can be boosted, and can monitor control enclosure (1) that the voltage conversion unit (13) of battery electric quantity and electric battery (14) constitute in real time and be connected to form and be seepage flow and seepage pressure monitoring device, this device is positioned in the piezometric tube (3) on the reservoir dam (4), control enclosure (1) places the upper end of piezometric tube (3), and level sensor (2) sinks in the interior water of piezometric tube (3) vertically downward can carry out monitoring.

2. a kind of seepage flow and seepage pressure monitoring device that is used for reservoir dam according to claim 1, described control enclosure (1) is characterised in that: its annexation is that the input end of signal gathering unit (10) is connected with the upper end of the cable of level sensor (2), and output terminal passes through I ²C or spi bus are connected with microprocessor (11), the output terminal of microprocessor (11) is connected with wireless communication module (12) by serial communication interface RS232 or RS485, wireless communication module (12) also is connected with antenna (15), the output terminal of voltage conversion unit (13) is connected with the power input of signal gathering unit (10), microprocessor (11) and wireless communication module (12) respectively, and the input end of voltage conversion unit (13) is connected with electric battery (14).

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