CN103590444B - Method for continuously monitoring leakage of large buried pressure water pipe and booster early warning system - Google Patents
Method for continuously monitoring leakage of large buried pressure water pipe and booster early warning system Download PDFInfo
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Abstract
The invention discloses a method for continuously monitoring the leakage of a large buried pressure water pipe. The method comprises the steps that (1), continuously-monitored signal collection equipment is arranged inside the large buried pressure water pipe, and signal measurement and analysis equipment is arranged outside the pipe; (2), basic signal data of vibration, strain, sound waves and pressure changes when the monitored pressure water pipe operates under the normal working condition are measured, the leakage process of the monitored pressure water pipe is simulated, and characteristic signal data of vibration, strain, squeal and water pressure changes in the leakage process are measured; (3), the monitored data are analyzed, a model for reflecting the working state of the monitored pipe is built, the degree of hazard level and an early warning threshold are determined, and an analysis judgment module and a dangerous case issuing module are developed; (4), the monitored pressure water pipe is monitored continuously, and when the hazard level reaches the early warning threshold, an early warning is given.
Description
Technical field
The present invention is applicable to the safety monitoring technology field of large-scale pressure water pipe, relate to Inter-Basin Water Transfer Project, Hydraulic and Hydro-Power Engineering and municipal engineering, also be applicable to the conveying of the industry such as petrochemical industry or store other liquid or pressure pipelines of gaseous material or the safety monitoring of pressure vessel, relate to a kind of large-scale buried pressure water pipe seepage continuous monitoring method and explosion early warning system particularly.
Background technology
For solving people's livelihood water conservancy, ensure to supply water in large-and-medium size cities, China built divert Luanhe water to Tianjin, large quantities of water diversion project such as supply water deeply in east, the Yin great Ru Qin, large-scalely also have the south water to north across basin water diversion project what build and plan to build, draw the Chinese and to help Weihe etc.Large-scale pressure water pipe is the important component part of water diversion project.
Domestic and international built large-scale pressure water pipe pipe explosion accident happens occasionally, these accidents are serious threat urban water supply safety not only, causes the waste of valuable water resource, brings huge economic loss, also secondary disaster can be brought, the life security of the serious threat water-supply-pipe people along the line.
The domestic and international booster for large-scale buried pressure water pipe all lacks effective early warning means at present.The large-scale buried pressure water pipe that China builds is mainly through the generation of the method prevention pipe explosion accident of maintenance of regularly cutting off the water, because large-scale buried pressure water pipe is cut off the water time between overhaul long (maintenance in usual a year once), turn(a)round, is short, effectively can not stop booster by the method for maintenance of cutting off the water to occur, although China is newly-built or buried the monitoring instruments such as leaking equipment underground in local at the buried pressure water pipe of the part of building outward at pipeline, but restrict by various applicable elements, not high to the validity of early warning booster, and monitoring instrument due to buried in underground, be difficult to carry out safeguarding and technology upgrading, therefore, need research and development badly a kind of effective, be applicable to built or building seepage continuous monitoring method and the explosion early warning system of large-scale buried pressure water pipe, to ensure China's big and medium-sized cities water supply security, for Sustainable Socioeconomic Development escorts.
Although the booster reason of large-scale buried pressure water pipe is a lot, most important and a class booster that is that be difficult to prevent is the booster caused by pipeline localized seepage.This kind of booster has an evolution, first be cause pipeline localized seepage by a variety of causes, and then jet is formed under inner pipe water pressure, the current of high velocity jet wash away the sandy soil outside pipeline, provide space for pipeline expands outwardly, when this space is enough large, pipeline forms booster in interior pressure explosion.A large amount of observation and experiment display, causing in the process of booster by seepage, and the current of at a high speed ejection can cause pipe vibration and utter long and high-pitched sounds, and cause overpressure to change along with the development of the seepage order of severity.The present invention is conceived to these attendant phenomenons just, by monitoring pipe vibration in large-scale pressure water pipe, utter long and high-pitched sounds, pressure change and tube wall strain the early warning realized this kind of booster.Theory analysis and field trial all prove, the method principle is reliable, and precision is high, be not only applicable to newly-built pressure water pipe, also be adapted to the pressure water pipe built, be convenient to monitoring equipment safeguard and technology upgrading, be China's pressure water pipe safe operation need technology badly.
Summary of the invention
For overcoming the defect of prior art, the technical problem to be solved in the present invention there is provided a kind of large-scale buried pressure water pipe seepage continuous monitoring method, its by monitoring pipe vibration in large-scale pressure water pipe, utter long and high-pitched sounds, pressure change and tube wall strain the early warning realized this kind of booster, precision is high, be not only applicable to newly-built pressure water pipe, also be adapted to the pressure water pipe built, be convenient to monitoring equipment and safeguard and technology upgrading.
This large-scale buried pressure water pipe seepage continuous monitoring method, described method can produce jet based in pressure water pipe seepage process, occurs pipe vibration, utters long and high-pitched sounds and overpressure variation phenomenon; This continuous monitoring method, comprises the following steps:
(1) in large-scale pressure water pipe, arrange continuous monitor signal collecting device, arrange signal measurement and analytical equipment outward at pipeline;
(2) vibration of monitored pressure water pipe when accidental conditions, strain, sound wave and pressure change basis signal data are measured; Simulate monitored pressure water pipe seepage process, measure occur in seepage process vibration, strain, utter long and high-pitched sounds and variation in water pressure characteristic signal data;
(3) research and application data, set up the model of the monitored pipeline work condition of reflection, determine extent of injury grade and threshold value of warning, and judge module and dangerous situation release module are analyzed in exploitation;
(4) the continuous monitoring of monitored pressure pipeline is carried out, when there are abnormal signal data, system automatic decision its whether caused by pipe leakage, judge whether these signals derive from same breakthrough and accurately locate breakthrough position, to the signal deriving from same breakthrough, judge the extent of injury of seepage according to intensity, spectral characteristic and the variation in water pressure data vibrated and utter long and high-pitched sounds; When the extent of injury reaches threshold value of warning, issue alarm.
This method by monitoring pipe vibration in large-scale pressure water pipe, utter long and high-pitched sounds, pressure change and tube wall strain the early warning realized this kind of booster, precision is high, be not only applicable to newly-built pressure water pipe, also be adapted to the pressure water pipe built, be convenient to monitoring equipment and safeguard and technology upgrading.
Additionally provide the explosion early warning system utilizing this large-scale buried pressure water pipe seepage continuous monitoring method, comprise following composition:
(1) the continuous monitor signal collecting device arranged in large-scale pressure pipeline, comprises distributed vibration and strain sensing optical fiber, hydrophones and cable, fiber grating hydraulic pressure take into account transmission cable;
(2) signal measurement arranged outward at large-scale pressure pipeline and analytical equipment, comprise distributed optical fiber vibration and strain monitoring system, hydrophones acoustic vibration measurement mechanism, fiber grating water-pressure survey device;
(3) judge module, dangerous situation release module is analyzed;
(4) Internet data transfer system.
Detailed description of the invention
This large-scale buried pressure water pipe seepage continuous monitoring method, described method can produce jet based in pressure water pipe seepage process, occurs pipe vibration, utters long and high-pitched sounds and overpressure variation phenomenon; This continuous monitoring method, comprises the following steps:
(1) in large-scale pressure water pipe, arrange continuous monitor signal collecting device, arrange signal measurement and analytical equipment outward at pipeline;
(2) vibration of monitored pressure water pipe when accidental conditions, strain, sound wave and pressure change basis signal data are measured; Simulate monitored pressure water pipe seepage process, measure occur in seepage process vibration, strain, utter long and high-pitched sounds and variation in water pressure characteristic signal data;
(3) research and application data, set up the model of the monitored pipeline work condition of reflection, determine extent of injury grade and threshold value of warning, and judge module and dangerous situation release module are analyzed in exploitation;
(4) the continuous monitoring of monitored pressure pipeline is carried out, when there are abnormal signal data, system automatic decision its whether caused by pipe leakage, judge whether these signals derive from same breakthrough and accurately locate breakthrough position, to the signal deriving from same breakthrough, judge the extent of injury of seepage according to intensity, spectral characteristic and the variation in water pressure data vibrated and utter long and high-pitched sounds; When the extent of injury reaches threshold value of warning, issue alarm.
This method by monitoring pipe vibration in large-scale pressure water pipe, utter long and high-pitched sounds, pressure change and tube wall strain the early warning realized this kind of booster, precision is high, be not only applicable to newly-built pressure water pipe, also be adapted to the pressure water pipe built, be convenient to monitoring equipment and safeguard and technology upgrading.
Preferably, in step (4) according to vibrating, utter long and high-pitched sounds, pressure change signal intensity is when determining the position of leakage point along the position of the maximum value of line distribution, adopts Spline Interpolation Method can improve leakage point position estimating precision.
Preferably, this system involving vibrations, strain, sound wave and pressure monitoring device, analysis judge module, dangerous situation release module and network data transmission system.Vibration, strain, sound wave and pressure monitoring device are made up of the signal collecting device be arranged in pipeline and the surveying record device be arranged at outside pipeline; Analyze judge module for judging whether the distinctive signal collected is caused by pipe leakage, judge whether various distinctive signal derives from same breakthrough and accurately locate breakthrough position, and judge the extent of injury of seepage according to intensity, spectral characteristic and the variation in water pressure data vibrated and utter long and high-pitched sounds; Dangerous situation release module is issued at monitor terminal and is measured and dangerous situation data, when the extent of injury reaches threshold value of warning, sends sound and light alarm, is also given the alarm by the mobile phone of network to related personnel.
Additionally provide the explosion early warning system utilizing this large-scale buried pressure water pipe seepage continuous monitoring method, comprise following composition:
(1) the continuous monitor signal collecting device arranged in large-scale pressure pipeline, comprises distributed vibration and strain sensing optical fiber, hydrophones and cable, fiber grating hydraulic pressure take into account transmission cable;
(2) signal measurement arranged outward at large-scale pressure pipeline and analytical equipment, comprise distributed optical fiber vibration and strain monitoring system, hydrophones acoustic vibration measurement mechanism, fiber grating water-pressure survey device;
(3) judge module, dangerous situation release module is analyzed;
(4) Internet data transfer system.
Below embodiments of the invention are elaborated; the present embodiment is implemented premised on technical solution of the present invention; give detailed embodiment and concrete operating process, but protection scope of the present invention is defined by claims and is not limited to following embodiment.
1. carry out Monitoring Design according to the large-scale buried pressure water pipe engineering properties of monitoring.Pressure water pipe bore need meet artificial requirement of installing monitoring optical fiber, cable and optical cable, is usually not less than 1.5m; According to length of pipeline with go out line length and customize distributed vibration and strain sensing optical fiber, hydrophones and cable, fiber grating hydraulic pressure take into account transmission cable, optical fiber, cable and cable outer sheath select high density HDPE material, to reach good waterproof effect; According to the installing space of tubing attenuation characteristic determination hydrophones of monitoring, quantity and cable core number, hydrophones is sealed in cable, an entirety is formed with cable, adopt digital underwater sound detection cable in a cable, thousands of sensor can be sealed at most, significantly reduce cable core number simultaneously; According to the geographical elevation of buried depth of pipeline and pressure luffing scope, determine the distribution of fiber grating hydraulic gage.
2. distributed vibration and strain sensing optical fiber, hydrophones cable and fiber grating hydraulic gage transmission cable are installed in large-scale buried pressure water pipe, optical fiber need be fixed on inner-walls of duct, adopt bonding agent that is good with tubing adhesive property, environment-protecting asepsis, in cable and optical cable visual pipeline, flow velocity local is fixing, when fixing bottom tube wall, usual fixed point spacing is no more than 5m, when other position of pipe shaft is fixed, needs encryption.
3. optical fiber front end and terminal position need on-the-spot suitable position punching extraction pressure water pipe of selecting outside; respectively front end sensing unit and end sensing unit are installed; sensing optic cable, front end sensing unit, end sensing unit need be arranged in waterproof splice tray; for preventing external environment to front end sensing unit; the impact of end sensing unit and exit sensing optic cable; be greater than 0.5 meter of degree of depth under needing that front end and end waterproof splice tray are arranged on earth's surface, and carry out vibration isolation and waterproofing protection.
4. complete the connection of distributed optical fiber vibration monitoring device, pipe vibration underwater sound detection research and application device and pipeline internal water pressure fiber grating dynamic monitor.
5. after large-scale buried pressure water pipe recovers water flowing, first the basic data such as vibration, the underwater sound, hydraulic pressure (comprising the keying of pipeline charging pump, all kinds of valve) under monitoring each operation condition, then the atmospheric valve simulation seepage in various degree on manual control pipeline, the experimental data such as pipeline vibration, the underwater sound, hydraulic pressure when obtaining different operating mode, different leakiness, by alternate analysis, summarize suitable alarming threshold value.
The vibration produced in view of the pressure pipeline leakage of unlike material and frequency of uttering long and high-pitched sounds, spread speed, attenuation characteristic are different, for guaranteeing early warning effect, after system is installed, need monitor continuously vibration, noise and Simultaneous Pressure, optimize early warning threshold values index by field trial, final foundation leaks comprehensive monitoring and explosion early warning system continuously.
Beneficial effect of the present invention is as follows:
1. the present invention is based in pressure water pipe seepage process and can produce jet, there is pipe vibration, utter long and high-pitched sounds and overpressure change, employing continuous monitoring method effectively can be screened the harmfulness seepage causing booster to occur and also accurately locate seepage place, realizes early warning before harmfulness seepage causes booster.
2. the present invention installs continuous monitor signal collecting device in large-scale buried pressure water pipe, buries underground, be convenient to system maintenance and upgrading without the need to excavation.
3. the present invention adopts continuous monitoring technology, can carry out whole process monitoring continuously, have without monitoring blind area, precision is high, real-time good, affect little feature by accidentalia large-scale buried pressure water pipe.This system also may be used for newly-built large-scale pressure water pipe.
4. the present invention comprehensively adopts distributed optical fiber vibration and strain monitoring technology, pipe vibration underwater sound detection techniques, pipeline internal water pressure fiber grating Dynamic Monitoring monitoring related physical parameter, and system can adapt to the multiple tubing that Inter-Basin Water Transfer Project adopts.
The above, not do any pro forma restriction to the present invention, every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong to the protection domain of technical solution of the present invention.
Claims (4)
1. large-scale buried pressure water pipe seepage continuous monitoring method, described method can produce jet based in pressure water pipe seepage process, occurs pipe vibration, utters long and high-pitched sounds and overpressure variation phenomenon; This continuous monitoring method, is characterized in that: comprise the following steps:
(1) in large-scale pressure water pipe, arrange continuous monitor signal collecting device, arrange signal measurement and analytical equipment outward at pipeline;
(2) vibration of monitored pressure water pipe when accidental conditions, strain, sound wave and pressure change basis signal data are measured; Simulate monitored pressure water pipe seepage process, measure occur in seepage process vibration, strain, utter long and high-pitched sounds and variation in water pressure characteristic signal data;
(3) research and application data, set up the model of the monitored pipeline work condition of reflection, determine extent of injury grade and threshold value of warning, and judge module and dangerous situation release module are analyzed in exploitation;
(4) the continuous monitoring of monitored pressure pipeline is carried out, when there are abnormal signal data, system automatic decision its whether caused by pipe leakage, judge whether these signals derive from same breakthrough and accurately locate breakthrough position, to the signal deriving from same breakthrough, judge the extent of injury of seepage according to intensity, spectral characteristic and the variation in water pressure data vibrated and utter long and high-pitched sounds; When the extent of injury reaches threshold value of warning, issue alarm.
2. large-scale buried pressure water pipe seepage continuous monitoring method according to claim 1, it is characterized in that: in step (4) according to vibrating, utter long and high-pitched sounds, pressure change signal intensity is when determining the position of leakage point along the position of the maximum value of line distribution, adopts Spline Interpolation Method can improve leakage point position estimating precision.
3. large-scale buried pressure water pipe seepage continuous monitoring method according to claim 1, is characterized in that: this system involving vibrations, strain, sound wave and pressure monitoring device, analysis judge module, dangerous situation release module and network data transmission system; Vibration, strain, sound wave and pressure monitoring device are made up of the signal collecting device be arranged in pipeline and the surveying record device be arranged at outside pipeline; Analyze judge module for judging whether the distinctive signal collected is caused by pipe leakage, judge whether various distinctive signal derives from same breakthrough and accurately locate breakthrough position, and judge the extent of injury of seepage according to intensity, spectral characteristic and the variation in water pressure data vibrated and utter long and high-pitched sounds; Dangerous situation release module is issued at monitor terminal and is measured and dangerous situation data, when the extent of injury reaches threshold value of warning, sends sound and light alarm, is also given the alarm by the mobile phone of network to related personnel.
4. utilize the explosion early warning system of large-scale buried pressure water pipe seepage continuous monitoring method according to claim 1, it is characterized in that: comprise following composition:
(1) the continuous monitor signal collecting device arranged in large-scale pressure pipeline, comprises distributed vibration and strain sensing optical fiber, hydrophones and cable, fiber grating hydraulic pressure take into account transmission cable;
(2) signal measurement arranged outward at large-scale pressure pipeline and analytical equipment, comprise distributed optical fiber vibration and strain monitoring system, hydrophones acoustic vibration measurement mechanism, fiber grating water-pressure survey device;
(3) judge module, dangerous situation release module is analyzed;
(4) Internet data transfer system.
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