CN108303498A - The linear monitoring system and method that water channel destroys - Google Patents

Abstract

The invention discloses a linear monitoring system and method for water canal damage, which includes a point-tube soil moisture sensor that is prone to cracks in the water canal, and is embedded in a plurality of metal wires at the bottom of the water canal. The metal wires are connected in parallel, and each metal wire The wire is divided into several metal segments. The voltage change of the metal segment indicates the signal of the displacement change of the canal and the water content of the canal bottom and slope measured by the tubular soil moisture sensor. The above data is transmitted to the server or cloud storage for post-processing to realize the canal Broken pipeline linear monitoring. The invention realizes accurate monitoring of water channel damage by organically combining sensor monitoring and metal wire monitoring.

Description

Linear monitoring system and method for canal damage

technical field

The invention relates to the technical field of civil engineering monitoring, in particular to a linear monitoring system and method for canal damage.

Background technique

Canals are artificially dug waterways, which can be divided into main canals and branch canals. Main canals and branch canals are generally built with masonry or cement mortar. Aqueducts can transfer water spatially, maintain an even distribution of water resources, block floods, prevent dangers, and effectively preserve water resources.

At present, most aqueducts in our country use open channels to pass water, and the concrete lining of open channels has the characteristics of large surface area and thin thickness. Since the water-passing section is lined with ordinary concrete (plain concrete) without reinforcement, it is easy to crack during use, resulting in channel leakage. Adding reinforcement during channel construction will significantly increase the project cost. For the newly formed cracks, it is extremely difficult to observe, especially for the long-term use of the channel, the channel damage cannot be observed by the naked eye during the use period. gap. For irrigation canals, it not only reduces the irrigation area, reduces the utilization rate of water resources, but also wastes water resources to a great extent. impact, reducing the service life of the canal, and later maintenance and reconstruction will cost a lot of money.

Therefore, from an engineering point of view, the earlier the cracks are discovered, the more beneficial it is to the project, which can save a lot of manpower and material resources and maintenance costs of the project, reduce the waste of water resources, and play an important role in further improving irrigation efficiency.

To sum up, in the prior art, there is still a lack of an effective solution to the problem of effective monitoring of the damage state of the canal.

Contents of the invention

In order to solve the deficiencies of the existing technology, one of the purposes of the present invention is to provide a linear monitoring system for canal damage, measure the water content of the canal bottom and slope and the corresponding voltage change of the metal wire, collect the data in real time and send it to the server or cloud Storage, post-processing, and linear monitoring of pipeline damage.

The linear monitoring system for canal damage includes a point-tube soil moisture sensor that is prone to cracks in the canal, and is embedded with multiple metal wires at the bottom of the canal. The metal wires are connected in parallel, and each metal wire is divided into several metal segments. The voltage change of the metal section represents the signal of the displacement change of the canal and the water content of the canal bottom and slope measured by the tubular soil moisture sensor. The above data is transmitted to the server or cloud storage for post-processing to realize the linear monitoring of the canal damage.

In the present invention, the metal wire is evenly divided into several metal segments, which are connected into the circuit in series. Since the material characteristics of each metal segment are the same, each metal segment can be regarded as a plurality of metal elements with the same initial resistance. Since the current in the series circuit Equal everywhere, then the voltage at both ends of each metal segment is the same at the initial moment. With the destruction of the canal, the bottom of the canal will be deformed to different degrees, and the small metal segments will be stretched to different degrees, and their cross-sectional areas will change accordingly, resulting in different resistance values of each small metal segment at different times, thus obtaining corresponding voltage changes .

The voltage change is mainly measured by the voltmeter, the voltage signal is collected by the signal collector, and the collected electrical signal is transmitted to the server or the cloud for storage, and the software or information processing system is used for real-time data processing and analysis to obtain the soil water content of different parts Rate and voltage change rate, so as to realize the linear monitoring of the damage of the canal.

Further, the outside of the metal wire is wrapped with an insulating layer, and an adhesive is used to bond the insulating layer and the metal wire, and the insulating layer and the water channel, so as to ensure that the small strain of the metal wire can be accurately transmitted.

Further, each metal wire is divided into several metal segments regarded as resistance elements and connected in series in the circuit.

Further, the metal wire adopts a sensitive grid, which is made of a metal foil grid or a metal wire with a thickness of 0.003-0.101 mm.

The second object of the present invention is to disclose a linear monitoring method for canal damage, including:

Install pipe-type soil moisture sensors at points where cracks are likely to appear in the canal, and bury multiple metal wires at the bottom of the canal;

Divide each metal wire into several metal segments. The voltage change of the metal segment represents the signal of the displacement change of the channel and the water content of the channel bottom and slope measured by the tubular soil moisture sensor, which realizes the monitoring of the parameter change rate of each metal segment and the soil moisture content. parameters;

When any of the above two parameters exceeds the limit value, the alarm will be activated.

Furthermore, when a crack occurs in the water channel, the metal segment at the corresponding position on the wire is pulled, the cross-sectional area decreases, and the resistance increases, while the current of each metal segment is the same, the corresponding voltage on each metal segment increases, The resistance or voltage change rate can be obtained, and the location of the crack in the water channel can be locked to the small metal section with the largest resistance change rate, so as to lock the damage position of the water channel.

Further, the two parameters have the following four combinations:

(1) When the parameter change rate of the small metal section and the soil moisture content both exceed the limit value, it is determined that the canal is damaged;

(2) When the change rate of the parameters of the small metal section and the soil moisture content do not exceed the limit value, it is determined that the canal is in a safe use state;

(3) When the change rate of the parameters of the small metal section exceeds the limit value, but the soil moisture content does not exceed the limit value, it is determined that the canal is damaged, but the tubular soil moisture sensor is faulty;

(4) The parameter change rate of the small metal section does not exceed the limit value, and when the soil moisture content exceeds the limit value, there are two possibilities. One is that the water channel is damaged, but the circuit where the metal wire is located is faulty, and the other is that the water channel is not damaged and the soil contains water. The rate is affected by other factors beyond the limit value.

Compared with prior art, the beneficial effect of the present invention is:

1. Compared with the past, when the canal damage is serious, measures are taken to carry out maintenance and reconstruction work. Combined with the canal damage monitoring system of the soil moisture sensor, the change of water content can be monitored in real time, so that corresponding remedial measures can be taken in time at the initial stage of cracks , is conducive to engineering safety, and can also save a lot of manpower, material and financial resources, and is economical and reliable.

2. Through the linear monitoring of the damage of the canal, it is helpful to analyze and study the process of crack damage, save a lot of field experiment time, and provide data for scientific research.

3. The damage of canals will cause water loss and reduce irrigation efficiency. Canal leakage will cause groundwater level rise, affect the quality of soil in irrigation areas, deform and damage canal facilities, and cause huge losses to agricultural production. Timely measures can reduce losses and improve the efficiency of agricultural production.

4. The system can reduce agricultural water consumption in general, expand irrigation area, improve the utilization rate of agricultural water and the transportation capacity of the channel, so that the construction and maintenance costs of the channel can be significantly reduced. ,

5. The present invention combines sensor monitoring and metal wire monitoring to realize accurate monitoring of water channel damage. Among them, the parallel connection between the metal wires can ensure that when one of the metal wires breaks down, other metal wires will fail. The wire can operate normally; and the small metal segments in the wire are connected in series, which can ensure that when any part of the wire fails, the whole metal wire stops operating, resulting in a substantial increase in the total resistance value in the circuit, and the fault can be locked to a certain location. A certain metal wire saves time, manpower and material resources and ensures the stability of the system.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute improper limitations to the present application.

Fig. 1 is the schematic diagram that moisture sensor is arranged along the canal;

Figure 2 is a flow chart of the linear monitoring system for canal damage;

Fig. 3 circuit schematic diagram of the ground displacement test system of the resistance smart grid;

In Fig. 1, 1, the first monitoring point, 2, the second monitoring point, 3, the third monitoring point, 4, the fourth monitoring point, 5, the first monitoring point.

Detailed ways

It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

As introduced in the background technology, there are deficiencies in the monitoring of canal damage in the prior art. In order to solve the above technical problems, this application proposes a linear monitoring system and method for canal damage.

The structure of the canal and the arrangement of monitoring points are shown in Figure 1. The reservoir area and the control end are provided with water inlets, through which the water in the reservoir area enters the control end, contraction section, stable section, stilling pool, and retreat channel, which is easier The points where cracks appear are at the end of the shrinkage section and the beginning of the stilling pool. When the monitoring points are arranged, the first monitoring point 1 and the third monitoring point 3 are the points where cracks are more likely to appear, the second monitoring point 2, and the fourth monitoring point 4 , the fifth monitoring point 5 is based on the selection of the first monitoring point 1 and the third monitoring point 3, and is a supplementary monitoring point to make the monitoring points evenly arranged.

The present invention combines the tube-type soil moisture sensor and the principle that the resistance of the metal wire increases with the decrease of the cross-sectional area, measures the water content of the canal bottom and side slope and the voltage change of the corresponding metal wire, collects data in real time, and then transmits it to the server Or store in the cloud for post-processing to realize linear monitoring of pipeline damage.

At the initial stage of construction, metal wires are embedded at the bottom of the canal. It is required that the metal wires respond sensitively to changes in cross-sectional area and be as thin as possible. It is recommended to use sensitive grids to ensure that the performance parameters such as the strength of the geogrid will not be affected after the metal wires are embedded. Connect the metal wires into the circuit. The metal wires are connected in parallel, and the metal wires are divided into several metal segments. The initial resistance of each segment is the same. Each metal segment is regarded as a resistance element and connected into the circuit in series. When a crack occurs in the water channel, the small metal section at the corresponding position on the wire is pulled, the cross-sectional area decreases, and the resistance increases, and the current of each small metal section is the same, so the corresponding voltage on each small metal section increases, and the resistance can be obtained (or voltage) change rate, lock the position of the crack in the water channel to the small metal section with the largest resistance change rate, and lock the damage position in a short time, so that corresponding measures can be taken in time.

Among them, the outside of the metal wire is wrapped with an insulating layer to protect it from corrosion by moisture and dust. The way of connecting the circuit is parallel connection, which can not only improve the accuracy of the measurement result, but also prevent one of the metal wires from being damaged. In case of failure, the measurement results will be affected. Adhesives are used to bond the insulating layer and the metal wire, and the insulating layer and the water channel part, so as to ensure that the small strain of the metal wire can also be accurately transmitted.

As shown in Figure 3, the present invention also discloses a linear monitoring method for the damage of the water channel. Each metal wire segment is regarded as a resistance, and the metal segments on the same resistance wire are connected in series in the circuit, the currents are equal, and the initial resistance is equal. The same, the same voltage. When the water channel is damaged, the small metal sections on the same metal wire are pulled differently, so the resistance is different. Measure the voltage of each small section separately to obtain the corresponding resistance change rate, and lock the position where the water channel cracks occur to the maximum resistance change rate. The small metal section can lock the damaged position in a short time, so that it is convenient to take corresponding measures in time.

The invention reflects the damage degree of the canal by the rate of change of resistance or voltage and soil water content. When the damage of the canal reaches a certain level, seepage will occur, which increases the water content of the soil. The moisture sensor monitors the change of the water content, collects data, and transmits the data later. Store it on the server or cloud for post-processing to realize linear monitoring of pipeline damage. Among them, the system monitors two parameters in total, one is the change rate of the resistance (or voltage) of each metal segment, and the other is the soil moisture content. When any of the above two parameters exceeds the limit value, the device will alarm, and corresponding remedial measures can be taken for the cracks in the water channel to reduce unnecessary losses.

Among them, more specifically, the two parameters have the following four combinations:

(1) When the resistance (or voltage) change rate and soil moisture content exceed the limit value, it is determined that the canal is damaged;

(2) When the change rate of resistance (or voltage) and soil moisture content do not exceed the limit value, it is determined that the canal is in a safe state of use;

(3) When the resistance (or voltage) change rate exceeds the limit value, but the soil moisture content does not exceed the limit value, it is determined that the canal is damaged, but the moisture sensor is faulty;

(4) When the change rate of resistance (or voltage) and the soil moisture content exceed the limit value, there are two possibilities. One is that the water channel is damaged, but the circuit where the metal wire is located is faulty, and the other is that the water channel is not damaged and the soil moisture content is affected. The influence of other factors such as rainfall exceeds the limit;

If the situation in (1) (3) above occurs, remedial measures should be taken in time to avoid unnecessary losses. At the same time, the soil moisture sensor at the corresponding position should be checked in time to debug the performance of the equipment; if the situation in (4) above occurs , The circuit at the corresponding position should be checked. If the circuit fails, it should be repaired in time and remedial measures should be taken.

In another implementation example of the present invention, a monitoring system containing only soil moisture sensors is disclosed,

When cracks occur at the bottom of the canal or on the side slope, it will cause leakage of the canal, which will increase the water content and exceed the value of the water content under the same conditions. The data will be fed back to the remote monitoring center, and relevant departments can take timely measures to maintain the project . Among them, the range of soil sensed by the soil moisture sensor is a pipe cylinder with an outer diameter of 637.5 mm, a wall thickness of 250 mm, and a height of 250 mm. Several representative points that are most prone to cracks can be selected on the entire canal, and monitoring points can be supplemented according to the selected points, so that the monitoring points on the entire canal can be evenly arranged, and the damage of the entire canal can be reflected in time and accurately, thereby realizing Linear monitoring of canal damage.

As shown in Figure 2, during the construction period, the tubular soil moisture sensor is used as a sensor monitoring module to collect monitoring data and bury it in the bottom of the canal and slope at fixed points, measure its moisture, collect the data and transmit the data to the cloud or server through the data forwarding system. , the remote monitoring center reads information from the cloud database, and performs corresponding analysis to obtain the moisture change curve. The tube-type soil moisture sensor combines the advantages of the catheter type and the needle type, and makes up for their shortcomings. It is a soil moisture content measurement device for large-scale and wider application scenarios. It can guarantee the minimum disturbance of the soil, while measuring the soil moisture content, soil temperature content parameters.

The tubular soil moisture sensor can be buried in the soil and dams for a long time to perform fixed-point monitoring and online measurement of surface and deep soil moisture. It can be used in conjunction with a data collector as a tool for fixed-point monitoring or mobile measurement of moisture.

The remote monitoring center is used for data storage, analysis, display and early warning. In order to observe the entire moisture change process, the measurement is carried out from the completion of the equipment installation during the construction period. With the change of time, due to the different external factors, the moisture content will change, so as to obtain a series of moisture content change curves, comprehensively considering various external factors factor, the range of moisture content variation under normal conditions can be obtained.

The invention combines the soil moisture sensor and the metal wire resistance measuring principle to simultaneously measure the two parameters of soil moisture content and voltage change rate, which can not only measure the required parameter values, but also judge whether the device is faulty according to the situation that occurs, so as to ensure The stability of the system can achieve the purpose of monitoring the damage of the canal.

The present invention embeds metal wires in water channels, and care should be taken to prevent the metal wires from rusting. Since there are circuits in the system, attention should be paid to setting an insulating layer to protect the resistance wires from moisture and other factors. At the same time, an adhesive is used to bond the metal wire, insulating layer and foundation together to ensure that the micro-strain of the foundation can also be reflected into the system through the metal wire to ensure the accuracy of the parameters.

The invention adopts the metal wire for detection, which is simple and easy, and its innovation lies in the application of the metal wire to the measurement of the deformation. By embedding the metal wire into the water channel, it is applied to the water channel, mainly by burying the metal wire underground in the initial stage of construction. Relevant measurements are mainly improved on construction methods.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (7)

1. the linear monitoring system that water channel destroys, characterized in that including the point tubular type soil water for crack easily occur in water channel is arranged Sub-sensor, is embedded in the more one metal wires in water channel bottom, in parallel between the wire, will be divided into several metals per one metal wire Section, the metal segments voltage change indicate the signal of water channel change in displacement and the canal bottom and side of tubular soil moisture sensor measurement Slope moisture content stores above-mentioned data transmission to server or high in the clouds, carries out post-processing, realizes the pipe line that water channel destroys Property monitoring.

2. the linear monitoring system that water channel as described in claim 1 destroys, characterized in that use insulating layer outside the wire It wraps, it is with binder that insulating layer and wire, insulating layer and water channel part is bonding, ensure the small strain energy of wire It is enough accurately to transmit.

3. the linear monitoring system that water channel as described in claim 1 destroys, characterized in that every one metal wire is divided into several The metal segments for being considered as resistive element are in series in circuit.

4. the linear monitoring system that water channel as described in claim 1 destroys, characterized in that the wire uses sensitive grid, It is made of the metal foil palisade that thickness is 0.003~0.101mm or of metal wire.

5. the linear monitoring method that water channel destroys, characterized in that including：

Tubular soil moisture sensor is arranged in the point for easily occurring crack in water channel, and more one metal wires are embedded at water channel bottom；

Several metal segments will be divided into per one metal wire, metal segments voltage change indicates the signal and tubular type soil of water channel change in displacement The canal bottom and side slope moisture content that moisture transducer measures realize monitor each metal segment parameter change rate and soil moisture content this Two parameters；

When any one of above-mentioned two parameter is more than limit value, actuation of an alarm.

6. the linear monitoring method that water channel as claimed in claim 5 destroys, characterized in that when water channel generates crack, metal The metal segments tension of corresponding position on silk, cross-sectional area reduce, and resistance increases, and the electric current of each metal segments is identical, then each gold Belong to corresponding voltage on segment to increase, resistance or voltage change ratio can be obtained, the position that water channel is generated to crack is locked to resistance change The maximum metal segment of rate, locking water channel destroy position.

7. the linear monitoring method that water channel as claimed in claim 5 destroys, characterized in that described two parameters shared following four Kind combined situation：

(1) when metal segment parameter change rate and soil moisture content are more than limit value, then water channel destruction is regarded as；

(2) when metal segment parameter change rate and soil moisture content are less than limit value, then regard as water channel makes in safety Use state；

(3) metal segment parameter change rate is more than limit value, and when soil moisture content is less than limit value, then regard as water channel It destroys, but tubular soil moisture sensor fault；

(4) metal segment parameter change rate is less than limit value, and when soil moisture content is more than limit value, then there are two types of may Property, first, water channel destroys, but circuit malfunctions where wire, second is that water channel does not destroy, soil moisture content is by other factors It influences to exceed limit value.