CN201278198Y - Monitoring and early warning system for influence of landslide on pipeline - Google Patents
Monitoring and early warning system for influence of landslide on pipeline Download PDFInfo
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- CN201278198Y CN201278198Y CNU2008201224122U CN200820122412U CN201278198Y CN 201278198 Y CN201278198 Y CN 201278198Y CN U2008201224122 U CNU2008201224122 U CN U2008201224122U CN 200820122412 U CN200820122412 U CN 200820122412U CN 201278198 Y CN201278198 Y CN 201278198Y
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Abstract
The utility model relates to a landslide is to monitoring and early warning system of pipeline influence. The system consists of a landslide pipeline thrust monitoring device, a pipeline strain monitoring device, a field monitoring station and a receiving terminal of an office; the soil pressure box fiber grating sensor (4) of the thrust monitoring device of the field landslide to the pipeline and the output of the pipe body fiber grating sensor (3) of the pipeline strain monitoring device which are arranged on the pipeline in the landslide in a certain structural form are respectively connected with an automatic optical switch (6) of a field monitoring station, the output of the automatic optical switch (6) is connected with the input of a fiber grating demodulator (7), and the output of the fiber grating demodulator (7) is also connected with the input of an upper computer (8); the output of the upper computer (8) is connected with the GPRS transmission module (9), the receiving terminal GPRS receiving module (10) of the office is connected with the input of the lower computer (11), and the output of the lower computer (11) is connected with the alarm (12) and the display.
Description
Technical field
The utility model is a kind of monitor and early warning system that pipeline is influenced based on the landslide of fiber grating.Relate to and measure stress and piping system technical field.
Background technology
The rock soil mass that is meant the formation slope that comes down is followed the shear action process on the weak face in its underpart and is produced the mass motion phenomenon under action of gravity.Landslide disaster is one of the principal mode that causes the geologic hazard of human life's property loss.Length can reach thousands of kilometers apart from oil transportation or gas pipe line fed distance, passes through numerous geology and geomorphologies unit, often will pass the geologic condition areas with complicated inevitably, as mountain area, permafrost region etc.Because the insufficient or pipe-line construction of route selection brings out the landslide or reasons such as landslide are brought out in earthquake, the pipeline that lays in the mountain area might pass through in movable sliding mass, and the safe operation of pipeline suffers the serious threat on these movable landslides.These are referred to as pipeline landslide in landslide of threat tube safety possibly.
In the past in the pipeline transportation history in 40 years, once repeatedly caused pipeline accident based on the geologic hazard on landslide.Europe natural gas line casualty data group (EGIG) investigation 1970 in the West Europe pipeline accident of calendar year 2001, the 7%th, cause by geologic hazard; 1984 of DOT statistics show that to 2001 natural gas transport data 8.5% accident is caused by geologic hazard; 12% of the pipeline accident of Canada State Energy Resources Commission investigation demonstration influence Canada operation is that geologic hazard causes.The huge landslide that caused by earthquake in March, 1987 makes traverses the fracture that 40km length takes place Ecuador's pipeline, and stopping transportation fortnight, economic loss reaches 700,000,000 dollars.Nineteen ninety-five and winter in 1996,, cause U.S.'s northwest gas transmission line three place's pipelines to rupture because the landslide is brought out in the extra-heavy rainfall in western part, Washington.
The pipeline industry of China be in flourish among, these pipelines are transported to the western abundant petroleum gas of China the east of China mostly, and the most of mountain regions of China have been concentrated in western part of China, the west and south, and pipeline just will pass through seriously area of geologic hazard inevitably.Loyal military gas pipe line Zhong County-Yichang 409 km segment are in eastern west place in Hubei mountain area, Chongqing, and peaks rising one upon another on the mountain peak, the discrepancy in elevation is remarkable, landform, geologic condition complexity, and growing has the geologic hazard of many groups easily to send out the rock stratum, is the location that takes place frequently of landslide, crag avalanche.The blue Chengdu-Chongqing products pipeline Lanzhou that was constructed and put into operation in 2003 is to the Guangyuan section, structure is active, the lithology fragmentation, and the landform cutting is grown, the back input huge fund of going into operation is used for hazards control, still has more than 530 places but investigation in 2007 shows the geologic hazard of threat tube safety.The West-East National Gas Transmission Project main line always is about 4000 kilometers, suffers various geologic hazard serious threats, and the landslide disaster of wherein finding out reaches more than 39 places.
In the face of numerous pipeline landslide disasters, the pipeline operator of China is often taked positive engineering control measure, but also there is the drawback of some in these measures, it at first is the cost height, next is that prevention and cure project is not " putting things right once and for all " yet, the uncertain factor of design and construction is more, moreover the cycle of administering is long.The monitoring then be a kind of efficiently, prophylactico-therapeutic measures cheaply.Italy SNAM company will monitor the main mode of pipeline as the control landslide disaster, and they have carried out reaching the monitoring in 30 years to pipeline, have successfully avoided a large amount of pipeline accidents.After pipelines such as the transfering natural gas from the west to the east of China, loyal military line are gone into operation the landslide is also effectively monitored.
Main multipoint displacement meter or the clinograph of adopting of traditional landslide depth displacement monitoring, total powerstation or GPS means are adopted in the distortion of table portion, and the real-time of these methods is all relatively poor, is difficult to satisfy the long-term real-time requirement of landslide monitoring.The monitoring of traditional pipeline strain is counted the master with electric resistance wire strain gauge, vibrating string type strain, and relatively poor aspect corrosion-resistant, anti-interference, stability also is difficult to meet the demands.In recent years the distributing optical fiber sensing technology of Xing Qiing (is representative with BOTDR) is coming down or the existing certain application of pipeline monitoring.
The distribution type fiber-optic technology has been applied to monitor Landslide Deformation, and dual mode is arranged.A kind of is not select for a post what object as carrier, and optical fiber is directly experienced the distortion of the soil body, because soil body loose particles and large deformation easily, optical fiber is difficult to and soil body compatible deformation like this, and the large deformation of the local soil body destroys optical fiber easily.Another kind of mode is that choosing is constructed body as carrier, and the distortion of constructing body by monitoring reflects the distortion on landslide indirectly.Usual way is to select the structures of landslide control engineering as carrier, and this method generally is applied to the effect monitoring of landslide control engineering; Other method is existing other structures (as top-down ladder) conduct distortion carrier of choosing on the sliding mass, and this method is workable, but monitoring result is difficult to the quantitative Analysis distortion.
These present monitoring modes all are confined to independent monitoring is carried out on landslide (causing the calamity body) or pipeline (hazard-affected body), also the pipeline under landslide and the influence thereof are not carried out the combined monitoring of system.Combined monitoring can not only be judged active situation, the growth rule of development, the failure mechanism on landslide, can also find out influence mode and the degree of landslide to pipeline, the more important thing is the stress change in displacement rule that can grasp steel pipe, judges the safe class of pipeline.Comprehensive above information just can be carried out safe early warning to pipeline landslide, forecasts the precarious position of pipeline in advance, for the mitigation design for scheme implements to provide foundation.Combined monitoring has been represented the trend of pipeline landslide monitoring.
The utility model content
The purpose of this utility model is the monitor and early warning system that the low landslide based on fiber grating of a kind of spatial resolution height of design, cost influences pipeline.
The utility model proposes a kind of monitor and early warning system that pipeline is influenced based on the landslide of fiber grating sensing technology.This system adopts fiber grating sensing technology, and the pipeline under the influence of landslide is carried out combined monitoring, and the monitoring content comprises thrust monitoring and the pipeline strain monitoring of landslide to pipeline.And made up monitoring system, realized real-time automatic collecting, remote transmission and the analysis automatically of data.
Fiber Bragg Grating (Fiber Bragg Grating, FBG are called for short fiber grating) is the micro optical element that develops rapidly over nearly 20 years, is to utilize the photosensitivity in the optical fiber to make.Photosensitivity in the so-called optical fiber is meant when laser passes through doped fiber, and the refractive index of optical fiber will be with the characteristic of the space distribution generation respective change of light intensity.And the space phase grating that in fibre core, forms, the essence of its effect is exactly (transmission or reflection) wave filter or the catoptron that forms an arrowband in fibre core.
Optical fiber grating sensing is a kind ofly to select reverberator, its back-reflection center wavelength of light λ being scribed the wavelength that forms by optical fiber
BWith grating periods lambda and fiber core refractive index n
EffRelevant, promptly
λ
B＝2n
effΛ
The ultimate principle of FBG optical fiber grating sensing is when temperature, strain, stress or other measured physical quantity around the grating change, will cause the variation of grating cycle or fiber core refractive index, thereby make the centre wavelength of fiber grating produce displacement λ
B,, can obtain the situation of change of measured physical quantity by detecting the displacement situation of grating wavelength.Promptly
Δλ
B＝K
ε·Δε+K
T·ΔT
K in the formula
εBe strain sensing sensitivity coefficient, K
TBe the fiber grating temperature sensor sensitivity coefficient.
For the FBG fibre core is the situation of pure quartz, K
εBe 1pm/u ε, K
TBe 10pm/ ℃.The optical fiber material, write strain and temperature sensing sensitivity coefficient that technology and encapsulating material all can influence FBG, must demarcate above parameter before using.
Fiber grating can be made into various senser elements, is used widely at sensory field.Compare with traditional electric transducer, fiber-optic grating sensor has own unique advantage: 1. sensing head is simple in structure, volume is little, in light weight, shape variable, be fit to imbed in the various large scale structures, but the stress of measurement structure inside, strain and structural damage etc., stability, good reproducibility; 2. and have natural compatibility between the optical fiber, easily be connected with optical fiber, optical loss is low, spectral characteristic good, reliability is high; 3. have non-conducting, little to measured medium influence, have characteristics anticorrosive, anti-electromagnetic interference (EMI) again, be adapted at working in the rugged surroundings; 4. light and handy soft, can in an optical fiber, write a plurality of gratings, constitute sensor array, combine with wavelength-division multiplex and time division multiplex system, realize distributed sensing; 5. metrical information is with Wavelength-encoding, thereby fiber-optic grating sensor is not subjected to the influence of factors such as light-intensity variation, optical fiber connection and coupling loss, the optical polarization variation of light source, the antijamming capability that tool is stronger; 6. high sensitivity, high degree of resolution.
Compare with widely used Brillouin light domain reflectometer BOTDR, the advantage of fiber-optic grating sensor has: 1. pair measurement point can accurately be located, the resolution height; 2. cost is low; 3. can process, encapsulate transducing part, make it be more suitable for on-the-spot rugged surroundings.
Because these advantages, in the Geotechnical Engineering field, fiber-optic grating sensor is easy to imbed in the rock soil mass strain and the temperature to its inside and carries out high resolving power and large-range measuring, and technical advantage is very obvious, especially is embodied in to obtain long-term, rock soil mass deformation data reliably.
The utility model proposes based on the landslide of fiber grating as depicted in figs. 1 and 2 to the thrust monitor and early warning system of pipeline, by the landslide receiving terminal of the monitoring device of pipeline thrust, pipeline strain monitoring device, field monitoring station, office is formed.With the landslide, scene that certain version is installed on the pipeline soil pressure cell strain fiber-optic grating sensor 4 of pipeline thrust monitoring device and the body strain fiber-optic grating sensor 3 of pipeline strain monitoring device are exported the automatic light switch 6 that connects the field monitoring station, automatically 6 outputs of light switch connect the input of fiber Bragg grating (FBG) demodulator 7, and the output of an end of host computer 8 connects the end input of automatic light switch 6 in addition; The output of fiber Bragg grating (FBG) demodulator 7 also connects the input of bit machine 8; The output of host computer 8 connects GPRS transport module 9, connects the input of next bit computer 11, the output of next bit computer 11 device 12 taking alarm and display by the receiving terminal GPRS receiver module 10 of office.
The electric principle of this system as shown in Figure 3, the monitoring landslide is to two fiber-optic grating sensors--the soil pressure cell fiber-optic grating sensor 4 of the thrust and the pipeline strain of pipeline respectively, the PC joint of body fiber-optic grating sensor 3 is connected with the PC joint of light switch 6 with optical fiber, the R232 of light switch 6 directly connects the R232 of bit machine 8, the PC joint of light switch 6 connects the CH1 end of fiber Bragg grating (FBG) demodulator 7SM125, the LAN port of fiber Bragg grating (FBG) demodulator 7SM125 connects the LAN port of bit machine 8, the R232 port of host computer 8 connects the R232 port of GPRS transport module 9 Siemens MC 35i, GPRS transport module 9 is through antenna GSM, GPRS network, received next bit computer 11 is received in the back by R232 R232 by GPRS receiver module 10 antenna GSM, the output of next bit computer 11 is by the R232 of R232 device 12DS-7400 taking alarm, and the output of next bit computer 11 is by the VGA end of VGA termination display.
Monitoring landslide is given fiber Bragg grating (FBG) demodulator 7 to the output signal of two kinds of fiber-optic grating sensors of the thrust of pipeline and pipeline strain through conducting one by one, fiber Bragg grating (FBG) demodulator 7 demodulates the centre wavelength displacement of each fiber-optic grating sensor and is defeated by host computer 8, and light switch 6 gives the cycle of fiber Bragg grating (FBG) demodulator 7 Continuity signals by PC control 8.Host computer 8 calculates the signal that each monitoring variable is defeated by GPRS transport module 9 and accepts GPRS transport module 9 automatically and controls, GPRS transport module 9 is transferred to the receiving terminal GPRS receiver module 10 that is positioned at office with each monitoring variable that host computer 8 calculates by public's cordless communication network, also can accept the signal of receiving terminal, after sending to next bit computer 11 processing, report to the police by the display demonstration and by alarm 12.
The landslide to the formation of the thrust monitoring device of pipeline as shown in Figure 4, soil pressure cell fiber-optic grating sensor 4 outputs that are the 13 pairs of pipeline 14 thrusts monitorings in landslide connect 6 inputs of light switch, 6 outputs of light switch connect 7 inputs of grating demodulation instrument, and the output of grating demodulation instrument connects on-the-spot host computer 8.And the fiber-optic grating sensor of the 13 pairs of pipeline 14 thrusts monitorings of coming down adopts fiber grating encapsulation soil pressure cell fiber-optic grating sensor 4; Soil pressure cell fiber-optic grating sensor 4 is fixed on the pipeline 14 by soil pressure cell support 21, and soil pressure cell fiber-optic grating sensor 4 is experienced the glide direction of the sensitive area of pressure towards landslide 13.The pressure of soil pressure cell fiber-optic grating sensor 3 measurements is exactly the positive thrust of the 13 pairs of pipelines 14 in landslide like this.
Concrete formation is: soil pressure cell fiber-optic grating sensor 4 is fixed on the pipeline 14 by soil pressure cell support 21, and soil pressure cell fiber-optic grating sensor 4 is experienced the glide direction of the sensitive area of pressure towards landslide 13.The pressure of soil pressure cell fiber-optic grating sensor 4 measurements is exactly the positive thrust of the 13 pairs of pipelines 14 in landslide like this.Soil pressure cell support 21 is made up of two circular arc steel plate clips, wherein is welded with base on one section circular arc steel plate, and soil pressure cell fiber-optic grating sensor 4 embeds in the base, and keeps certain allowance, makes soil pressure cell energy Free Transform.The clamp connection part 23 at soil pressure cell support 21 two ends connects by nut.When slide in landslide 13, the thrust of the 13 pairs of soil pressure cells in landslide can be measured by soil pressure cell fiber-optic grating sensor 4, and this measured value deducts the soil body gravity pressure that soil pressure cell fiber-optic grating sensor 4 bears, and is the thrust that landslide 13 distortion produce pipeline 14.
The formation of the monitoring device of body stress as shown in Figure 5 and Figure 6, be respectively to arrange pipeline monitoring cross section, arrange evenly that in the periphery in each monitoring cross section of pipeline 14 3 body fiber- optic grating sensors 3 and 3 body fiber-optic grating sensors 3 are arranged on the plane with pipeline 14 axis normal in the both sides of the edge and the center on landslide on landslide.3 outputs of body fiber-optic grating sensor connect 6 inputs of light switch, and 6 outputs of light switch connect fiber Bragg grating (FBG) demodulator 7 inputs, and the output of fiber Bragg grating (FBG) demodulator 7 connects on-the-spot host computer 8.
Concrete formation is: respectively arrange pipeline monitoring cross section in the both sides of the edge on landslide and the center on landslide, and the spacing in monitoring cross section should not surpass 60m.Evenly arrange that in the periphery in each monitoring cross section of pipeline 14 3 body fiber- optic grating sensors 3 and 3 body fiber-optic grating sensors 3 are arranged on the plane with pipeline 14 axis normal.When body fiber-optic grating sensor 3 is installed, scrape pipeline 14 anticorrosive coats fully off, and polishing pipeline 14 surfaces are pasted the body fiber-optic grating sensor with Instant cement 3 and are encapsulated 24 packaged body fiber-optic grating sensors 3 to smooth.After treating that three body fiber-optic grating sensor 3 paste Lists are good, the fibre that draws of body fiber-optic grating sensor 3 is caused ground in the lump, and protect.
Draw when pipeline 14 axially bears/during compressive stress, three body fiber-optic grating sensors 3 bear and draw/compressive strain; According to certain algorithm,, can obtain the size and the position of maximum strain on these pipeline 14 cross sections by this cross section three places strain.Based on the steel theory of elasticity, can obtain the size of maximum drawing/compressive stress on pipeline 14 cross sections.The selection in monitoring cross section is very important to monitoring effect.
A large amount of studies show that, the crucial performance of 13 pairs of pipeline 14 imposed stresses that come down just can be judged the acceptable stress state of pipeline 14 in the axial direction preferably to the measurement of pipeline 14 axial stresses.Therefore, the only axial strain of measuring channel 14 of body fiber-optic grating sensor 3.
It is on-the-spot that the field monitoring station is arranged on the landslide, comprises optical Fiber Closure, connects optical cable 5, light switch 6, fiber Bragg grating (FBG) demodulator 7, host computer 8, GPRS transport module 9; By the optical Fiber Closure of each fiber-optic grating sensor be connected optical cable 5 fiber-optic grating sensor of each position that will come down on 13 and receive the light switch 6 of monitoring station, 6 outputs of light switch connect fiber Bragg grating (FBG) demodulator 7, fiber Bragg grating (FBG) demodulator 7 outputs connect bit machine 8, and host computer 8 outputs connect GPRS transport module 9.The optical Fiber Closure of each fiber-optic grating sensor be connected optical cable 5 and will come down and be transferred to the light switch 6 of monitoring station in the fiber-optic grating sensor set of signals of each position on 13, light switch 6 changes each channel signal successively to fiber Bragg grating (FBG) demodulator 7, fiber Bragg grating (FBG) demodulator 7 demodulates the centre wavelength displacement of each fiber-optic grating sensor and gives host computer 8, host computer 8 calculates the signal that each monitoring variable is defeated by GPRS transport module 9 and accepts GPRS transport module 9 automatically and controls, GPRS transport module 9 is transferred to the receiving terminal that is positioned at office with each monitoring variable that host computer 8 calculates by public's cordless communication network, also can accept the signal of receiving terminal, send to next bit computer 11.
Wherein:
Light switch 6: because the fiber-optic grating sensor of monitoring landslide and pipeline is a lot, signalling channel is numerous, can't once be connected on the fiber Bragg grating (FBG) demodulator 7, with light switch 6 each channel signal is changed successively to fiber Bragg grating (FBG) demodulator 7 and is analyzed; This light switch 6 is selected city's pin product for use;
Fiber Bragg grating (FBG) demodulator 7: the centre wavelength displacement that is used to demodulate each fiber-optic grating sensor; Select city's pin product for use;
Host computer 8 and program: the frequency that is used to control fiber Bragg grating (FBG) demodulator 7 demodulation, and the centre wavelength displacement that fiber Bragg grating (FBG) demodulator 7 demodulates calculated each monitoring variable automatically, deep displacement, table position as the landslide moved, body maximum strain etc., monitoring variable is sent to GPRS transport module 9, and the signal of accepting GPRS transport module 9 is controlled; Host computer 8 is selected city's pin product for use, and program is self-editing;
GPRS transport module 9: be used for each monitoring variable that host computer 8 calculates is transferred to the receiving terminal that is positioned at office by public's cordless communication network, also can accept the signal of receiving terminal, send to next bit computer 11.
The receiving terminal that is positioned at office comprises following 2 parts:
1) the GPRS receiver module 10, are used to receive the monitoring variable that field monitoring station GPRS transport module 9 sends, and are transferred to terminal next bit computer 11, send feedback command also can for on-the-spot GPRS transport module 9;
2) next bit computer 11 and program are used for the signal of download terminal GPRS receiver module 10, and calling program analyzes automatically, and analysis result and alarming threshold value are compared, and implement in the time of necessary to report to the police;
3) alarm 12, are used for when analysis result surpasses alarming threshold value the sound alarm signal taking place; Alarm 12 is by next bit computer 11 and programmed control.
The principle of work of this system is such, and in 13 active procedures that come down, pipeline 14 bears landslide 13 thrusts and body 14 strain variation take place, and measures by body fiber-optic grating sensor 3; On the surface of contact on pipeline 14 and landslide 13, the thrust of the 13 pairs of pipelines 14 in landslide is measured by soil pressure cell fiber-optic grating sensor 4.
By connecting optical cable 5, the sensor signal concentration of transmissions that the landslide is gone up each position is to light switch 6, light switch 6 changes each channel signal successively to fiber Bragg grating (FBG) demodulator 7, fiber Bragg grating (FBG) demodulator 7 demodulates each sensor wavelength centre wavelength displacement and sensing is given host computer 8, host computer 8 is calculated as each monitoring variable automatically with the centre wavelength displacement that (FBG) demodulator demodulates, as 13 the deep displacement of coming down, the table position is moved, the body maximum strain, interface thrust etc., and monitoring variable sent to on-the-spot GPRS transport module 9, GPRS transport module 9 is transferred to terminal GPRS receiver module 10 by public's cordless communication network with signal, terminal GPRS receiver module 10 sends to terminal next bit computer 11, terminal next bit computer 11 provides warning with each monitoring variable and alarming threshold value contrast in the time of necessary.
Advantage of the present utility model shows:
1) propose to come down 13 influences down pipelines 14 carry out the method for combined monitoring, disclosed and come down 13 and the interaction characteristics of pipeline 14; With the come down safe early warning of 13 influences pipeline 14 down of many indexs, uncertainty or wrong early warning in the pipeline 14 landslide monitoring early warning have greatly been avoided;
2) fiber grating sensing technology is applied to the system monitoring of pipeline landslide 13, this technology is anti-interference, corrosion-resistant, it is obvious sometimes to be easy to networking etc.; By constructing specific carrier, realized moving with fiber grating sensing technology monitoring landslide depth displacement and table position, compare with the technological means that the table position is moved with traditional monitoring landslide depth displacement, fiber grating sensing technology is easy to realize auto-real-time monitoring, the spatial resolution height, and cost is lower;
3) pipeline strain monitoring, be in each monitoring cross section 3 sensors to be installed evenly, the maximum strain that draws this monitoring cross section by specific algorithm distributes, and has realized the monitoring purpose with minimum monitoring point, saved cost, also the set-up time of Jian Shaoing reaches the damage to pipeline;
4) all monitoring variables are all realized by fiber grating sensing technology, are easy to make up monitoring system, are easy to realize the real-time automatic collecting analysis and the long-range issue of pipeline landslide combined monitoring data, and remote live is reported to the police automatically; Avoided loaded down with trivial details artificial image data, reduced time of fire alarming, this to the pipeline emergency measure take most important.
Description of drawings
Fig. 1 landslide constitutes synoptic diagram to the monitor and early warning system of pipeline influence
Fig. 2 landslide is to the monitor and early warning system theory diagram of pipeline influence
Fig. 3 landslide is to the monitor and early warning system electrical schematic diagram of pipeline influence
Fig. 4 soil pressure sensor synoptic diagram
The monitoring device synoptic diagram (cross-sectional view) of Fig. 5 body stress
The monitoring device synoptic diagram of Fig. 6 body stress
3-body fiber-optic grating sensor 4-soil pressure cell fiber-optic grating sensor wherein
5-optical cable 6-light switch
7-fiber Bragg grating (FBG) demodulator 8-host computer
9-GPRS transport module 10-GPRS receiver module
11-next bit computer 12-alarm
13-landslide 14-pipeline
15-slip 18-side slope
21-soil pressure cell support 22-support clip
The encapsulation of 23-clamp connection part 24-body fiber-optic grating sensor
Embodiment
Embodiment. this example is a pilot system, and covers the overlayer that the cross section is sliding surface at a wide 300m, the thick 29m that comes down, base and test on the sliding mass at a slow speed.This monitoring and warning pipeline landslide system is made up of the receiving terminal of the thrust monitoring device of pipeline, pipeline strain monitoring device, field monitoring station, office the landslide as depicted in figs. 1 and 2.With the landslide, scene that certain version is installed on the pipeline soil pressure cell strain fiber-optic grating sensor 4 of the thrust monitoring device of pipeline and the body strain fiber-optic grating sensor 3 of pipeline strain monitoring device are exported the automatic light switch 6 that connects the field monitoring station respectively, automatically 6 outputs of light switch connect the input of fiber Bragg grating (FBG) demodulator 7, and the output of an end of host computer 8 connects the end input of automatic light switch 6 in addition; The output of fiber Bragg grating (FBG) demodulator 7 also connects the input of bit machine 8; The output of host computer 8 connects GPRS transport module 9, connects the input of next bit computer 11, the output of next bit computer 11 device 12 taking alarm and display by the receiving terminal GPRS receiver module 10 of office.
The electric principle of this system as shown in Figure 3, the monitoring landslide is to the soil pressure cell fiber-optic grating sensor 4 of the thrust and the pipeline strain of pipeline respectively, the PC joint of body fiber-optic grating sensor 3 is connected with the PC joint of light switch 6 with optical fiber, the R232 of light switch 6 directly connects the R232 of bit machine 8, the PC joint of light switch 6 connects the CH1 end of fiber Bragg grating (FBG) demodulator 7SM125, the LAN port of fiber Bragg grating (FBG) demodulator 7SM125 connects the LAN port of bit machine 8, the R232 port of host computer 8 connects the R232 port of GPRS transport module 9 Siemens MC 35i, GPRS transport module 9 is through antenna GSM, GPRS network, received next bit computer 11 is received in the back by R232 R232 by GPRS receiver module 10 antenna GSM, the output of next bit computer 11 is by the R232 of R232 device 12DS-7400 taking alarm, and the output of next bit computer 11 is by the VGA end of VGA termination display.
Monitoring landslide is given fiber Bragg grating (FBG) demodulator 7 to the output signal of the fiber-optic grating sensor of the thrust of pipeline and pipeline strain through conducting one by one, fiber Bragg grating (FBG) demodulator 7 demodulates the centre wavelength displacement of each fiber-optic grating sensor and is defeated by host computer 8, and light switch 6 gives the cycle of fiber Bragg grating (FBG) demodulator 7 Continuity signals by host computer 8 controls.Host computer 8 calculates the signal that each monitoring variable is defeated by GPRS transport module 9 and accepts GPRS transport module 9 automatically and controls, GPRS transport module 9 is transferred to the receiving terminal GPRS receiver module 10 that is positioned at office with each monitoring variable that host computer 8 calculates by public's cordless communication network, also can accept the signal of receiving terminal, after sending to next bit computer 11 processing, report to the police by the display demonstration and by alarm 12.
The landslide to the formation of the thrust monitoring device of pipeline as shown in Figure 4, soil pressure cell fiber-optic grating sensor 4 outputs that are the 13 pairs of pipeline 14 thrusts monitorings in landslide connect 6 inputs of light switch, 6 outputs of light switch connect 7 inputs of grating demodulation instrument, and the output of grating demodulation instrument connects on-the-spot host computer 8.And the fiber-optic grating sensor of the 13 pairs of pipeline 14 thrusts monitorings of coming down adopts fiber grating encapsulation soil pressure cell fiber-optic grating sensor 4; Soil pressure cell fiber-optic grating sensor 4 is fixed on the pipeline 14 by soil pressure cell support 21, and soil pressure cell fiber-optic grating sensor 4 is experienced the glide direction of the sensitive area of pressure towards landslide 13.The pressure of soil pressure cell fiber-optic grating sensor 4 measurements is exactly the positive thrust of the 13 pairs of pipelines 14 in landslide like this.
Specifically: soil pressure cell fiber-optic grating sensor 4 is fixed on the pipeline 14 by soil pressure cell support 21, and soil pressure cell fiber-optic grating sensor 4 is experienced the glide direction of the sensitive area of pressure towards landslide 13.The pressure of soil pressure cell fiber-optic grating sensor 4 measurements is exactly the positive thrust of the 13 pairs of pipelines 14 in landslide like this.Soil pressure cell support 21 is made up of two circular arc steel plate clips, wherein is welded with base on one section circular arc steel plate, and soil pressure cell fiber-optic grating sensor 4 embeds in the base, and keeps certain allowance, makes soil pressure cell energy Free Transform.The clamp connection part 23 at soil pressure cell support 21 two ends connects by nut.When slide in landslide 13, the thrust of the 13 pairs of soil pressure cells in landslide can be measured by soil pressure cell fiber-optic grating sensor 4, and this measured value deducts the soil body gravity pressure that soil pressure cell fiber-optic grating sensor 4 bears, and is the thrust that landslide 13 distortion produce pipeline 14.
This installs single pass electric principle as shown in Figure 3, the PC joint of the soil pressure cell fiber-optic grating sensor 4 that 13 pairs of pipeline 14 thrusts that come down are monitored is connected with the PC joint of light switch 6 with optical fiber, the R232 of light switch 6 directly connects the R232 of bit machine 8, the PC joint of light switch 6 connects the CH1 end of fiber Bragg grating (FBG) demodulator 7SM125, and the LAN port of fiber Bragg grating (FBG) demodulator 7SM125 connects the LAN port of bit machine 8.
The formation of the monitoring device of body stress as shown in Figure 5 and Figure 6, be respectively to arrange pipeline monitoring cross section, arrange evenly that in the periphery in each monitoring cross section of pipeline 14 3 body fiber- optic grating sensors 3 and 3 body fiber-optic grating sensors 3 are arranged on the plane with pipeline 14 axis normal in the both sides of the edge and the center on landslide on landslide.3 outputs of body fiber-optic grating sensor connect 6 inputs of light switch, and 6 outputs of light switch connect fiber Bragg grating (FBG) demodulator 7 inputs, and the output of fiber Bragg grating (FBG) demodulator 7 connects on-the-spot host computer 8.
This installs single pass electric principle as shown in Figure 3, the PC joint of body fiber-optic grating sensor 3 is connected with the PC joint of light switch 6 with optical fiber, the R232 of light switch 6 directly connects the R232 of bit machine 8, the PC joint of light switch 6 connects the CH1 end of fiber Bragg grating (FBG) demodulator 7SM125, and the LAN port of fiber Bragg grating (FBG) demodulator 7SM125 connects the LAN port of bit machine 8.
Concrete formation is: respectively arrange pipeline monitoring cross section in the both sides of the edge on the wide landslide 13 of 100m and the center on landslide, the spacing in monitoring cross section is 50m.Evenly arrange that in the periphery in each monitoring cross section of pipeline 14 3 body fiber- optic grating sensors 3 and 3 body fiber-optic grating sensors 3 are arranged on the plane with pipeline 14 axis normal.When body fiber-optic grating sensor 3 is installed, scrape pipeline 14 anticorrosive coats fully off, and polishing pipeline 14 surfaces are pasted the body fiber-optic grating sensor with Instant cement 3 and are encapsulated 24 packaged body fiber-optic grating sensors 3 to smooth.After treating that three body fiber-optic grating sensor 3 paste Lists are good, the fibre that draws of body fiber-optic grating sensor 3 is caused ground in the lump, and protect.
Draw when pipeline 14 axially bears/during compressive stress, three body fiber-optic grating sensors 3 bear and draw/compressive strain; According to certain algorithm,, can obtain the size and the position of maximum strain on these pipeline 14 cross sections by this cross section three places strain.Based on the steel theory of elasticity, can obtain the size of maximum drawing/compressive stress on pipeline 14 cross sections.The selection in monitoring cross section is very important to monitoring effect.
A large amount of studies show that, the crucial performance of 13 pairs of pipeline 14 imposed stresses that come down just can be judged the acceptable stress state of pipeline 14 in the axial direction preferably to the measurement of pipeline 14 axial stresses.Therefore, the only axial strain of measuring channel 14 of body fiber-optic grating sensor 3.
In the above-mentioned monitoring device:
Fiber-optic grating sensor: select the fiber-optic grating sensor of design encapsulation voluntarily for use.
The light switch selects for use light to swell SUM-FSW;
The grating demodulation instrument is selected SM125 for use.
It is on-the-spot that the field monitoring station is arranged on the landslide, comprises optical Fiber Closure, connects optical cable 5, light switch 6, fiber Bragg grating (FBG) demodulator 7, host computer 8, GPRS transport module 9; By the optical Fiber Closure of each fiber-optic grating sensor be connected optical cable 5 fiber-optic grating sensor of each position that will come down on 13 and receive the light switch 6 of monitoring station, 6 outputs of light switch connect fiber Bragg grating (FBG) demodulator 7, fiber Bragg grating (FBG) demodulator 7 outputs connect bit machine 8, and host computer 8 outputs connect GPRS transport module 9.The optical Fiber Closure of each fiber-optic grating sensor be connected optical cable 5 and will come down and be transferred to the light switch 6 of monitoring station in the fiber-optic grating sensor set of signals of each position on 13, light switch 6 changes each channel signal successively to fiber Bragg grating (FBG) demodulator 7, fiber Bragg grating (FBG) demodulator 7 demodulates the centre wavelength displacement of each fiber-optic grating sensor and gives host computer 8, host computer 8 calculates the signal that each monitoring variable is defeated by GPRS transport module 9 and accepts GPRS transport module 9 automatically and controls, GPRS transport module 9 is transferred to the receiving terminal that is positioned at office with each monitoring variable that host computer 8 calculates by public's cordless communication network, also can accept the signal of receiving terminal, send to next bit computer 11.
Wherein:
Light switch: select for use light to swell scientific and technological SUM-FSW;
Fiber Bragg grating (FBG) demodulator: select SM125 for use;
Host computer and program: select for use and grind magnificent IPC-610, program is self-editing;
GPRS transport module: Siemens MC 35i
The receiving terminal that is positioned at office comprises following 2 parts:
(1) the GPRS receiver module 10, are used to receive the monitoring variable that field monitoring station GPRS transport module 9 sends, and are transferred to terminal next bit computer 11, send feedback command also can for on-the-spot GPRS transport module 9;
(2) next bit computer 11 and program are used for the signal of download terminal GPRS receiver module 10, and calling program analyzes automatically, and analysis result and alarming threshold value are compared, and implement in the time of necessary to report to the police;
(3) alarm 12, are used for when analysis result surpasses alarming threshold value the sound alarm signal taking place; Alarm 12 is by next bit computer 11 and programmed control.
The principle of work of this system is such, in 13 active procedures of landslide, pipeline 14 bears landslide 13 thrusts and body 14 strain variation takes place, and on the surface of contact on pipeline 14 and landslide 13, the thrust of the 13 pairs of pipelines 14 in landslide is measured by soil pressure cell fiber-optic grating sensor 4.
By connecting optical cable 5, the sensor signal concentration of transmissions that the landslide is gone up each position is to light switch 6, light switch 6 changes each channel signal successively to fiber Bragg grating (FBG) demodulator 7, fiber Bragg grating (FBG) demodulator 7 demodulates each sensor wavelength centre wavelength displacement and sensing is given host computer 8, host computer 8 is calculated as each monitoring variable automatically with the centre wavelength displacement that (FBG) demodulator demodulates, as 13 the deep displacement of coming down, the table position is moved, the body maximum strain, interface thrust etc., and monitoring variable sent to on-the-spot GPRS transport module 9, GPRS transport module 9 is transferred to terminal GPRS receiver module 10 by public's cordless communication network with signal, terminal GPRS receiver module 10 sends to terminal next bit computer 11, terminal next bit computer 11 provides warning with each monitoring variable and alarming threshold value contrast in the time of necessary.
Wherein:
GPRS receiver module 10: select Siemens MC 35i for use;
Alarm 12: select Bosch DS-7400 for use.
Through monitoring for a long time, this example is easy to make up monitoring system, is easy to realize the real-time automatic collecting analysis and the long-range issue of pipeline landslide 13 combined monitoring data, and remote live is reported to the police automatically.Avoided loaded down with trivial details artificial image data, reduced time of fire alarming, this to the pipeline emergency measure take most important.
Claims (4)
1. a landslide is to the monitor and early warning system of pipeline influence, it is characterized in that the landslide receiving terminal of the thrust monitoring device of pipeline, pipeline strain monitoring device, field monitoring station, office being made of; With the landslide, scene that certain version is installed on the interior conduit of landslide the soil pressure cell fiber-optic grating sensor (4) of the thrust monitoring device of pipeline and the body fiber-optic grating sensor (3) of pipeline strain monitoring device are exported the automatic light switch (6) that connects the field monitoring station respectively, automatically light switch (6) output connects the input of fiber Bragg grating (FBG) demodulator (7), and the output of fiber Bragg grating (FBG) demodulator (7) also connects the input of bit machine (8); The output of host computer (8) connects GPRS transport module (9), connects the input of next bit computer (11), the output device taking alarm (12) and the display of next bit computer (11) by the receiving terminal GPRS receiver module (10) of office.
2. landslide according to claim 1 is to the monitor and early warning system of pipeline influence, the electric principle that it is characterized in that this system is: the monitoring landslide is to two fiber-optic grating sensors--the soil pressure cell fiber-optic grating sensor (4) of the thrust and the pipeline strain of pipeline respectively, the PC joint of body fiber-optic grating sensor (3) is connected with (PC) joint of light switch (6) with optical fiber, (R232) of light switch (6) directly connects (R232) of bit machine (8), (PC) joint of light switch (6) connects (CH1) end of fiber Bragg grating (FBG) demodulator (7) SM125, (LAN) port of fiber Bragg grating (FBG) demodulator (7) SM125 connects (LAN) port of bit machine (8), (R232) port of host computer (8) connects (R232) port of GPRS transport module (9) Siemens MC 35i, GPRS transport module (9) is through antenna GSM, GPRS network, received next bit computer (11) is received in the back by (R232) (R232) by GPRS receiver module (10) antenna GSM, the output of next bit computer (11) is by (R232) device taking alarm (12) DS-7400 (R232), and the output of next bit computer (11) is by (VGA) end of (VGA) termination display;
Monitoring is come down the output signal of two fiber-optic grating sensors of the thrust of pipeline and pipeline strain is defeated by host computer (8) through the centre wavelength displacement that fiber Bragg grating (FBG) demodulator (7) fiber grating (7) demodulates each fiber-optic grating sensor; Host computer (8) calculates the signal that each monitoring variable is defeated by GPRS transport module (9) and accepts GPRS transport module (9) automatically and controls, GPRS transport module (9) is transferred to the receiving terminal GPRS receiver module (10) that is positioned at office with each monitoring variable that host computer (8) calculates by public's cordless communication network, also can accept the signal of receiving terminal, after sending to next bit computer (11) processing, report to the police by the display demonstration and by alarm (12).
3. landslide according to claim 1 is characterized in that to the monitor and early warning system of pipeline influence described landslide to the formation of the thrust monitoring device soil pressure cell fiber-optic grating sensor (4) of pipeline is:
Soil pressure cell fiber-optic grating sensor (4) is fixed on the pipeline (14) by soil pressure cell support (21), and soil pressure cell fiber-optic grating sensor (4) is experienced the glide direction of the sensitive area of pressure towards landslide (13); Soil pressure cell support (21) is made up of two circular arc steel plate clips, wherein is welded with base on one section circular arc steel plate, and soil pressure cell fiber-optic grating sensor (4) embeds in the base, and keeps certain allowance, makes soil pressure cell energy Free Transform; The clamp connection part (23) at soil pressure cell support (21) two ends connects by nut.
4. landslide according to claim 1 is characterized in that to the monitor and early warning system of pipeline influence the formation of the body fiber-optic grating sensor (3) of described pipeline strain monitoring device is:
Respectively arrange pipeline monitoring cross section in the both sides of the edge on landslide and the center on landslide, and the spacing in monitoring cross section should not surpass 60m; Periphery in each monitoring cross section of pipeline (14) is evenly arranged 3 body fiber-optic grating sensors (3), and 3 body fiber-optic grating sensors (3) are arranged on the plane with pipeline (14) axis normal; Body fiber-optic grating sensor (3) is installed on smooth pipeline (14) surface, pastes body fiber-optic grating sensor encapsulation (24) packaged body fiber-optic grating sensors (3) with Instant cement; The fibre that draws of body fiber-optic grating sensor (3) is caused ground in the lump, and protect.
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| CNU2008201224122U CN201278198Y (en) | 2008-09-03 | 2008-09-03 | Monitoring and early warning system for influence of landslide on pipeline |
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