CN119043264A - Section settlement monitoring system and monitoring method based on fiber bragg grating sensor - Google Patents
Section settlement monitoring system and monitoring method based on fiber bragg grating sensor Download PDFInfo
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- CN119043264A CN119043264A CN202411058961.8A CN202411058961A CN119043264A CN 119043264 A CN119043264 A CN 119043264A CN 202411058961 A CN202411058961 A CN 202411058961A CN 119043264 A CN119043264 A CN 119043264A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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Abstract
The invention discloses a section settlement monitoring system and a monitoring method based on fiber bragg grating sensors, wherein the section settlement monitoring system comprises a rigid support, a plurality of displacement sensors, a plurality of rigid stay wires, a plurality of monitoring anchor points, 2 inclinometry rigid beams, a plurality of inclination sensors, 2 inclinometry support legs, a plurality of hooked pulleys, an optical cable, a fiber bragg grating demodulator, a power supply unit and a monitoring and early warning platform, wherein the 2 simple support legs of the rigid support are arranged on two sides of a settlement monitoring area, the settlement rigid beams are arranged on the simple support legs, the plurality of displacement sensors are uniformly distributed on the settlement rigid beams and are connected to the monitoring anchor points through the rigid stay wires, the simple support legs are connected with the inclinometry rigid beams through rotating shafts, and the inclination sensors and the displacement sensors are arranged on the inclinometry rigid beams.
Description
Technical Field
The invention belongs to the technical field of fiber bragg grating sensors, and particularly relates to a section settlement monitoring system and a monitoring method based on a fiber bragg grating sensor.
Background
The weak sections of the building structures such as the key road sections with tunnels passing through, the roads with culverts under, cast-in-situ box girder supports and the like have uneven settlement wind directions, and the settlement disasters have the characteristics of strong concealment, high burst and the like, so that settlement monitoring on the weak construction sections gradually becomes a standard requirement. The total station is mainly adopted to intermittently monitor the set point, but the monitoring method has the problems of high cost, complex operation, poor real-time performance, poor durability and the like. The monitoring method by using the vibrating wire sensor is used for monitoring, and the research of the vibrating wire sensor shows that the service life of the vibrating wire sensor is limited by the electric monitoring principle and the vibrating wire sensor cannot be monitored in real time. The real-time on-line monitoring of the section settlement is used for timely finding the deformation condition of the weak section of the monitored building in the construction process and the operation period, evaluating the safety state of the weak section and preventing potential safety hazards, and scientific basis can be provided for the design, construction and maintenance of the building by the real-time on-line monitoring of the structural deformation of the weak section of the monitored building, so that the construction quality is improved.
The fiber grating sensor is a wavelength modulation type fiber sensor. The basic working principle is that light enters a grating area through an optical fiber, and a plurality of parameters of the light in the grating area are caused to change through the change of external quantity, such as wavelength, intensity, amplitude, frequency and the like, so that the external quantity is measured, and data transmission is realized. The fiber bragg grating sensor has the characteristics of strong anti-interference capability, no electromagnetic interference, high measurement precision, easiness in distributed networking, good environmental adaptability and the like. The fiber bragg grating sensor belongs to a safe product and is widely used for remote, online, real-time and intelligent monitoring of mines, bridges, tunnels, deep foundation pits, high slopes, assembled buildings and the like.
At present, manufacturers working on fiber bragg grating sensing technology at home and abroad commonly adopt modes of epoxy resin, fiber bragg grating and a sensing matrix to encapsulate a substrate, wherein the epoxy resin glue is only bonded with the sensing matrix through physical bonding, the bonding mode is not firm, and the epoxy resin glue is extremely easy to damage and fall off in high-temperature, high-humidity, strong ultraviolet and corrosive environments, so that further improvement is needed.
Disclosure of Invention
The invention provides a section settlement monitoring system and a monitoring method based on a fiber bragg grating sensor, which are used for adapting to the requirements of real-time, online, efficient and high-precision monitoring of weak sections of a building, and meanwhile, a three-dimensional settlement model can be built by a plurality of groups of monitoring devices in cooperation, each group can be repeatedly and circularly used alternately, so that the problems of high cost, complex installation and use operation, poor real-time performance and poor durability of the traditional monitoring method can be solved.
In order to solve the problems, the technical scheme provided by the invention is as follows:
The embodiment of the invention provides a section settlement monitoring system based on a fiber bragg grating sensor, which comprises a rigid support (1), a plurality of displacement sensors (2), a plurality of rigid stay wires (3), a plurality of monitoring anchor points (4), 2 inclinometry rigid beams (5), a plurality of inclination sensors (6), 2 inclinometry supporting legs (7), a plurality of hooked pulleys (8), an optical cable (9), a fiber bragg grating demodulator (10), a power supply unit (11), a monitoring and early warning platform (12), a remote monitoring center (13) and a mobile terminal (14);
The device comprises a rigid support (1), at least two inclination angle sensors (6), a plurality of displacement sensors (2) arranged at intervals on a settlement rigid beam (102) of the rigid support (1) are connected with the monitoring anchor points (4) through rigid stay wires (3), at least 1 inclination angle sensor (6) is arranged on the bottom of the inclination rigid beam (5), notches (502) formed in the end parts of the inclination rigid beam (5) are provided with hooked pulleys (8), and the displacement sensors (2) arranged on the inclination rigid beam (5) are fixed on the hooked pulleys (8) through the rigid stay wires (3);
All displacement sensors (2) and inclination sensors (6) are used for acquiring settlement data within the range of the settlement rigid beam (102), all displacement sensors (2) and inclination sensors (6) are connected to the fiber bragg grating demodulator (10) through the optical cable (9), the power supply unit (11) provides power for the fiber bragg grating demodulator (10), the fiber bragg grating demodulator (10) transmits acquired data to the monitoring and early warning platform (12) through wireless, the monitoring and early warning platform (12) acquires and processes the data, extracts settlement information, draws a settlement curve, analyzes settlement trend, monitors the data according to preset data quality standards and rules, gives an alarm immediately once the data is abnormal or exceeds the preset range, provides scientific basis for safe operation and maintenance of a monitored structure, and can also send the data to the remote monitoring center (13) and the mobile terminal (14) for accident early warning in time.
According to an alternative embodiment of the present invention, the rigid support (1) is in a portal structure, and comprises a settlement rigid beam (102), 2 simple support legs (101) located at two ends of the settlement rigid beam (102), strip-shaped bases (103) are disposed at bottoms of the 2 simple support legs (101), first rotating shafts (104) are disposed at central positions where the 2 simple support legs (101) are connected with the settlement rigid beam (102), the first rotating shafts (104) penetrate through the first shaft holes (501) formed in the inclinometry rigid beam (5), and the rigid support (1) and the inclinometry rigid beam (5) can flexibly rotate around the first rotating shafts (104).
According to an alternative embodiment of the invention, a second rotating shaft (702) is arranged at the upper part of the inclinometry support leg column (701) of the inclinometry support leg (7), the second rotating shaft (702) can flexibly slide in the notch (502), a plate-shaped bottom plate (703) is arranged at the bottom of the inclinometry support leg column (701), and the hooked pulley (8) is fixed on the second rotating shaft (702).
According to an alternative embodiment of the invention, the simply supported leg (101), the sedimentation rigid beam (102) and the inclinometer leg (7) are all square rod-shaped or plate-shaped structures.
According to an alternative embodiment of the invention, the monitoring anchor point (4) comprises an installation base (401), a fixed connection device (402) is arranged on the installation base (401), and the installation base (401) and the monitored component of the monitoring anchor point (4) are firmly fixed with the ground through expansion screws, pre-embedding and bearing platform manufacturing.
According to an alternative embodiment of the invention, the hooked pulley block (8) comprises a lifting hook (8-01), a pulley shaft (8-02), a bearing (8-03) and a bearing sleeve (8-04), wherein the lifting hook (8-01) is fixed on the outer diameter of the bearing sleeve (8-04), the bearing sleeve (8-04) is embedded on the bearing (8-03), and the bearing (8-03) is in rolling connection with the pulley shaft (8-02).
The embodiment of the invention also provides a section settlement monitoring method based on the fiber bragg grating sensor, which is realized by the section settlement monitoring system based on the fiber bragg grating sensor in the embodiment, wherein the section settlement monitoring method comprises the following steps:
Step S1, setting a section settlement monitoring system on a section with settlement risk, wherein the section settlement monitoring system is arranged on a section with settlement risk, the sections with the requirements of section settlement monitoring are arranged on a lower key road section with tunnel crossing, a lower road with culvert construction and a cast-in-situ box girder support, the base (103) is simply supported by the ground on two sides of a settlement monitoring area, the center line of the simple support leg (101) is vertical to the ground at a measurement starting position, the 2 inclinometry support legs (7) are arranged on a set horizontal position without settlement and are distributed on the outer sides of the 2 simple support legs (101), the center line of the inclinometry support legs (7) is vertical to the ground, and the center line of a settlement rigid girder (102) is vertical to the ground;
step S2, setting the center point of a left first rotating shaft (104) as a point A, the center point of a right first rotating shaft (104) as a point B, the point A projected to the lower plane of a simple support base (103) as a point D, the point B projected to the lower plane of the simple support base (103) as a point C, the center point of a left second rotating shaft (702) of a inclinometry supporting leg (7) as a point E, the center point of a right second rotating shaft (702) of the inclinometry supporting leg (7) as a point F, the point E projected to the lower plane of a bottom plate (703) as a point H, the point F projected to the lower plane of the bottom plate (703) as a point G, the center point of a left first displacement sensor as a point W1, the center point of a left second displacement sensor as a point W2..A, the center point W1 projected to the lower plane of a monitoring anchor point as a point W01, and the center point of a left second displacement sensor as a point projected to the lower plane of the monitoring anchor point as a point W02;
Step S3, knowing the initial measurement position ad=bc=eh=fg=h 1;AB＝CD＝l1,AE＝BF＝l2, the uniform gap of the displacement meters on the settlement rigid beam (102) is a, W 1W01＝W2W02. =c;
Step S4, when subsidence occurs between AD and BC, the horizontal line inclination angle of a left inclination angle sensor (6) is measured on a left inclination rigid beam (5) to be theta Left side , the horizontal line inclination angle of a left displacement sensor (2) is measured to be theta Right side , the horizontal line inclination angle of the left inclination angle sensor (6) and the horizontal line of a right inclination rigid beam (5) is measured to be theta Right side , the left displacement sensor (2) is measured to be lambda Right side , and the data measured by the displacement sensor (2) on a subsidence rigid beam (102) are respectively c 1、c2 from left to right.
The calculation can be carried out as follows:
AE=l2+λ Left side ,BF＝l2+λ Right side ;
point a sink = point D sink= (l 2+λ Left side )×Sinθ Left side ;
point B sink = point C sink= (l 2+λ Right side )×Sinθ Right side ;
The calculation results are that:
AB and horizontal angle θ In (a) ＝arcsin[(|λ Left side -λ Right side |)/l1 ];
sinθ In (a) ＝(|λ Left side -λ Right side |)/l1;
point W 1 sink with respect to point a = c x sin θ In (a) ＝c×[(|λ Left side -λ Right side |)/l1 ];
Point W 2 sink with respect to point a = 2c x sin θ In (a) ＝2c×[(|λ Left side -λ Right side |)/l1 ];
......
Absolute dip at point W 1 = dip at point a + dip at point W 1 = (l 2+λ Left side )×Sinθ Left side +c×[(|λ Left side -λ Right side |)/l1) relative to dip at point a;
Absolute dip at point W 2 = dip at point a + dip at point W 2 = (l 2+λ Left side )×Sinθ Left side +2c×[(|λ Left side -λ Right side |)/l1) relative to dip at point a;
......
According to the sedimentation rule, W 1 and W 01、W2 and W 02. It is not considered along AD the projection position in the BC direction can generate relative sliding;
Absolute dip at point W 01 = absolute dip at point W 1 +(h1+c1)×cosθ In (a) ＝(l2+λ Left side )×Sinθ Left side +c×sinθ In (a) +＝(l2+λ Left side )×Sinθ Left side +c×sin{arcsin[(|λ Left side -λ Right side |/l1)]}+c1;
Absolute dip at point W 02 = absolute dip at point W 2 +(h1+c2)×cosθ In (a) ＝(l2+λ Left side )×Sinθ Left side +2c×sinθ In (a) ＝(l2+λ Left side )×Sinθ Left side +2c×sin{arcsin[(|λ Left side -λ Right side |/l1)]}+c2;
The settlement data of each point D, W, W02 and W03 can be obtained, a settlement curve is drawn according to the settlement data, all displacement sensors (2) and inclination sensors (6) are connected to a fiber bragg grating demodulator (10) through optical cables (9), a power supply unit (11) supplies power to the fiber bragg grating demodulator (10), the fiber bragg grating demodulator (10) transmits the collected data to a monitoring and early warning platform (12) in a wireless mode, the monitoring and early warning platform (12) collects and processes the data to extract settlement information, the settlement curve is drawn, settlement trends are analyzed, the data are monitored according to preset data quality standards and rules, an alarm is immediately sent once the data are found to be abnormal or exceed a preset range, scientific basis is provided for safe operation and maintenance of a monitored structure, and the data can be sent to a remote monitoring center (13) and a mobile terminal (14) to early warn accidents in time.
Compared with the prior art, the embodiment of the invention provides a section settlement monitoring system and a monitoring method based on a fiber bragg grating sensor, which have the following beneficial effects:
(1) The real-time on-line monitoring of the section settlement is used for timely finding the deformation condition of the weak section of the monitored building in the construction process and the operation period, evaluating the safety state of the weak section and preventing potential safety hazards, and scientific basis can be provided for the design, construction and maintenance of the building by the real-time on-line monitoring of the structural deformation of the weak section of the monitored building, so that the construction quality is improved.
(2) The section settlement monitoring system is simple and efficient to arrange, is suitable for settlement monitoring of weak sections of building structures such as a key road section with tunnel crossing, a road with culvert construction, a cast-in-situ box girder support and the like, is not influenced by construction, monitors by using the optics of a fiber bragg grating sensor, has low energy consumption, and has simple system structure, low cost, repeated use and easy popularization and application compared with the traditional measuring method.
(3) The invention discloses a full glass packaging device and a packaging method of a fiber bragg grating, which innovates and develops a novel fiber bragg grating sensor substrate based on the technology of the patent, and solves the problems of poor durability, poor stability and the like of the current fiber bragg grating sensor on the basis of having the characteristics of strong anti-interference capability, no electromagnetic interference, high measurement precision, easiness in distributed networking, good environmental adaptability and the like of the fiber bragg grating sensor.
(4) The invention is based on the novel fiber grating sensor substrate, and various novel fiber grating sensors are developed to realize high-precision measurement of sedimentation, displacement and inclination angle by utilizing the fiber grating sensing principle. The monitoring and early warning platform can monitor parameters such as displacement, inclination, temperature and the like respectively, monitoring data are independently monitored and do not interfere with each other, and a dynamic model can be built by initial mapping data to display the change condition in real time. The alarm threshold is set to realize sectional early warning, the monitoring data can be transmitted in real time in a wireless manner, remote local synchronous early warning is realized, and accidents can be effectively avoided. Centralized management and analysis of data are realized through the monitoring and early warning platform, and complexity and errors of manual operation are reduced.
(5) The sensor in the monitoring system is installed in a modularized manner, the installation is convenient and efficient, the power supply unit adopts modes of combining ups with a solar panel and the like, no separate line is required, the on-site engineering construction requirement is met, the maintenance and the replacement are convenient, the sensor can be recycled, the optical fiber arrangement of the monitoring device is scientific and reasonable, and the loss can be effectively reduced;
Therefore, the invention provides a section settlement monitoring system and a monitoring method based on a fiber bragg grating sensor, which are suitable for the requirements of real-time, on-line, efficient and high-precision monitoring of weak sections of building structures such as a key road section with tunnel crossing, a road with culvert construction, a cast-in-situ box girder support and the like, and meanwhile, a three-dimensional settlement model can be built by combining multiple groups of monitoring devices, and each group can be repeatedly and circularly used alternately, so that the system has economy and convenience in operation.
Drawings
In order to more clearly illustrate the embodiments or the technical solutions in the prior art, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a section settlement monitoring system based on a fiber bragg grating sensor according to an embodiment of the present application.
Fig. 2 is a front view of a functional structure of a section settlement monitoring system based on a fiber bragg grating sensor according to an embodiment of the present application.
Fig. 3 is a perspective view of a functional structure of a section settlement monitoring system based on a fiber bragg grating sensor according to an embodiment of the present application.
Fig. 4 is a schematic diagram of a monitoring anchor point structure in a section settlement monitoring system based on a fiber bragg grating sensor according to an embodiment of the present application.
Fig. 5 is a schematic diagram of a hooked pulley structure in a section settlement monitoring system based on a fiber bragg grating sensor according to an embodiment of the present application.
Fig. 6 is a schematic diagram illustrating installation of a displacement sensor on a settlement rigid beam of a section settlement monitoring system based on a fiber bragg grating sensor according to an embodiment of the present application.
Fig. 7 is a schematic diagram illustrating installation of a displacement sensor on an inclinometry rigid beam in a fiber bragg grating sensor-based section settlement monitoring system according to an embodiment of the present application.
Fig. 8 is a simplified plot of initial position ABCDEFGH for a weak section subsidence monitoring formulation according to an embodiment of the present application.
Fig. 9 is a simplified plot of initial position ABCDEFGH for a weak section subsidence monitoring formulation according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
As shown in fig. 1 to 7, the embodiment of the invention provides a section settlement monitoring system based on a fiber bragg grating sensor, which comprises a rigid support 1, a plurality of displacement sensors 2, a plurality of rigid stay wires 3, a plurality of monitoring anchor points 4, 2 inclinometry rigid beams 5, a plurality of inclination sensors 6, 2 inclinometry supporting legs 7, a plurality of hooked pulleys 8, an optical cable 9, a fiber bragg grating demodulator 10, a power supply unit 11, a monitoring and early warning platform 12, a remote monitoring center 13 and a mobile terminal 14.
As shown in fig. 1, fig. 2, fig. 3, fig. 6 and fig. 7, a rigid support 1 is arranged on a settlement risk section (settlement weak section) of a monitored structure, 2 inclinometry rigid beams 5 are connected to two sides of the rigid support 1, 2 inclinometry supporting legs 7 are connected to the ends of the 2 inclinometry rigid beams 5, a plurality of monitoring anchor points 4 are fixed on the ground below the rigid support 1, a plurality of displacement sensors 2 which are arranged on the settlement rigid beams 102 of the rigid support 1 at intervals are all connected with the monitoring anchor points 4 through rigid stay wires 3, at least 1 inclination sensor 6 is arranged on the bottom of the inclinometry rigid beams 5, a hooked pulley 8 is arranged on a notch 502 formed in the end of the inclinometry rigid beams 5, and the displacement sensors 2 arranged on the inclinometry rigid beams 5 are all fixed on the hooked pulley 8 through rigid stay wires 3.
All displacement sensors 2 and inclination sensors 6 are used for acquiring settlement data within the range of a settlement rigid beam 102, all displacement sensors 2 and inclination sensors 6 are connected to a fiber bragg grating demodulator 10 through optical cables 9, a power supply unit 11 supplies power to the fiber bragg grating demodulator 10, the fiber bragg grating demodulator 10 transmits acquired data to a monitoring and early warning platform 12 in a wireless mode, the monitoring and early warning platform 12 acquires, processes and extracts information of settlement amount of the data, draws a settlement curve, analyzes settlement trend, monitors the data according to preset data quality standards and rules, immediately gives an alarm once the data is found to be abnormal or exceeds the preset range, and can also send the data to a remote monitoring center 13 and a mobile terminal 14 to timely perform accident early warning.
The rigid support 1 is of a portal structure and comprises a settlement rigid beam 102 and 2 simple support legs 101 positioned at two ends of the settlement rigid beam 102, wherein the settlement rigid beam 102 is rigidly connected with the 2 simple support legs 101. The center line of the simple support base 103 is vertical to the section. The bottoms of the 2 simple support legs 101 are provided with long-strip-shaped bases 103. The center positions of the connection of the 2 simple support legs 101 and the settlement rigid beams 102 are respectively provided with 2 first rotating shafts 104, the first rotating shafts 104 pass through first shaft holes 501 formed in the inclinometry rigid beams 5, and the rigid support 1 and the inclinometry rigid beams 5 can flexibly rotate around the first rotating shafts 104. Notch 502 is opened at the other end of the inclinometry rigid beam. The upper part of the inclinometer support leg 701 of the inclinometer support leg 7 is provided with a second rotating shaft 702, the second rotating shaft 702 can flexibly slide in the notch 502, the bottom of the inclinometer support leg 701 is provided with a plate-shaped bottom plate 703, and a pulley 8 with a hook is fixed on the second rotating shaft 702.
The simple support leg 101, the settlement rigid beam 102 and the inclinometry support leg 7 are all square rod-shaped or plate-shaped structures, and the central lines are coplanar. The bottom surface of the base 103 the bottom surfaces of the bottom plates 703 are coplanar. As shown in FIG. 4, the monitoring anchor point 4 comprises a mounting base 401, a fixed connection device 402 is arranged on the mounting base 401, and the mounting base 401 and the monitored component of the monitoring anchor point 4 are firmly fixed with the ground through expansion screws, pre-embedding and bearing platform manufacturing. Both the inclinometer base plate 703 of the inclinometer leg 7 and the mounting base plate 401 of the monitoring anchor point 4 are firmly fixed with the ground.
As shown in FIG. 5, the hooked pulley block 8 comprises a lifting hook 8-01, a pulley shaft 8-02, a bearing 8-03 and a bearing sleeve 8-04, wherein the lifting hook 8-01 is fixed on the outer diameter of the bearing sleeve 8-04, the bearing 8-03 is embedded in the bearing sleeve 8-04, and the bearing 8-03 is in rolling connection with the pulley shaft 8-02.
Preferably, 2 displacement sensors 2 are arranged on the inclinometry rigid beam 5, 2 hooked pulleys 8 are respectively fixed on 2 second rotating shafts 702, the center line of a lifting hook 8-01 is collinear with the center line of the second rotating shafts 702, the center line of a pulley shaft 8-02 is collinear with the center line, a bearing 8-03 flexibly slides around the pulley shaft 8-02, and a plurality of displacement sensors 2 are connected with the rigid stay axes of a plurality of rigid stay wires 3 and the monitoring direction of the displacement sensors 2 are collinear. The plurality of rigid stay wires 3 are respectively and firmly connected with the fixed connecting device 402 of the plurality of monitoring anchor points 4 and the lifting hook 8-01 of the pulley 8 with the hook, and the displacement sensor 2 monitors data along with the axial movement of the rigid stay wires 3. The inclination sensor 6 is mounted on the inclinometry rigid beam 5, and the inclination sensor 6 monitors that the 0 point surface of the rotation angle is perpendicular to the axis of the first rotating shaft 104.
The connection mode of the displacement sensor and the rigid stay wire, the rigid stay wire and the monitoring anchor point and the rigid stay wire and the hooked pulley in another embodiment can be replaced by a bolt locking structure. In another embodiment, the shaft hole can be replaced by a shaft hole, a hole shaft, a through shaft perforation and the like. In another embodiment, the inclinometer base plate 703 of the inclinometer leg 7, the mounting base plate 401 of the monitoring anchor point 4 and the ground can be firmly fixed by means of expansion screws, pre-embedding, manufacturing a bearing platform and the like. All sensors in another embodiment may be connected in series to the fiber optic grating demodulator 10 or may be connected to the fiber optic grating demodulator 10 by fiber optic cable 9 alone. In another embodiment, the rigid support can be integrally processed by adopting a welding mode and the like, and can also be fixedly connected into a whole by bolts.
The embodiment of the invention also provides a section settlement monitoring method based on the fiber bragg grating sensor, which is realized by the section settlement monitoring system based on the fiber bragg grating sensor in the embodiment, wherein the section settlement monitoring method comprises the following steps:
Step S1, setting a section settlement monitoring system on a section with settlement risk, wherein the section settlement monitoring system is arranged on a section with settlement risk, the sections with the tunnel crossing key section, the culvert construction road, the cast-in-situ box girder support and the like, the base 103 is simply supported by the ground on two sides of a settlement monitoring area, the center line of the simple support legs 101 is vertical to the ground at a measurement starting position, the 2 inclinometry support legs 7 are arranged at a set horizontal position without settlement and are distributed outside the 2 simple support legs 101, the center line of the inclinometry support legs 7 is vertical to the ground, and the center line of the settlement rigid girder 102 is vertical to the ground.
Step S2, setting the center point of the left first rotating shaft 104 as a point a, the center point of the right first rotating shaft 104 as a point B, the point of the plane under the simply supported base 103 as a point D, the point of the plane under the simply supported base 103 as a point C, the center point of the left second rotating shaft 702 of the inclinometry leg 7 as a point E, the center point of the right second rotating shaft 702 of the inclinometry leg 7 as a point F, the point of the plane under the bottom plate 703 as a point H, the point of the plane under the bottom plate 703 as a point G, the center point of the left first displacement sensor as a point W1, the center point of the left second displacement sensor as a point W2.
Step S3, knowing the initial measurement position ad=bc=eh=fg=h 1;AB＝CD＝l1,AE＝BF＝l2, the displacement meters on the settlement rigidized beam 102 have uniform gaps of a, W 1W01＝W2W02. =c;
Step S4, when subsidence occurs between AD and BC, the horizontal line inclination angle of the left inclination angle sensor 6 measured on the left inclinometry rigid beam 5 is theta Left side , the displacement lambda Left side measured by the left displacement sensor 2, the inclination angle of the left inclination angle sensor 6 and the horizontal line of the right inclinometry rigid beam 5 measured by the right inclinometry rigid beam 5 is theta Right side , the displacement lambda Right side measured by the left displacement sensor 2, and the data measured by the displacement sensor 2 on the subsidence rigid beam 102 are c 1、c2 from left to right respectively, referring to FIG. 9;
the calculation can be carried out as follows:
AE=l2+λ Left side ,BF＝l2+λ Right side ;
point a sink = point D sink= (l 2+λ Left side )×Sinθ Left side ;
point B sink = point C sink= (l 2+λ Right side )×Sinθ Right side ;
The calculation results are that:
AB and horizontal angle θ In (a) ＝arcsin[(|λ Left side -λ Right side |)/l1 ];
sinθ In (a) ＝(|λ Left side -λ Right side |)/l1;
point W 1 sink with respect to point a = c x sin θ In (a) ＝c×[(|λ Left side -λ Right side |)/l1 ];
Point W 2 sink with respect to point a = 2c x sin θ In (a) ＝2c×[(|λ Left side -λ Right side |)/l1 ];
......
Absolute dip at point W 1 = dip at point a + dip at point W 1 = (l 2+λ Left side )×Sinθ Left side +c×[(|λ Left side -λ Right side |)/l1) relative to dip at point a;
Absolute dip at point W 2 = dip at point a + dip at point W 2 = (l 2+λ Left side )×Sinθ Left side +2c×[(|λ Left side -λ Right side |)/l1) relative to dip at point a;
......
According to the sedimentation rule, W 1 and W 01、W2 and W 02. It is not considered along AD the projection position in the BC direction can generate relative sliding;
Absolute dip at point W 01 = absolute dip at point W 1 +(h1+c1)×cosθ In (a) ＝(l2+λ Left side )×Sinθ Left side +c×sinθ In (a) +＝(l2+λ Left side )×Sinθ Left side +c×sin{arcsin[(|λ Left side -λ Right side |/l1)]}+c1;
Absolute dip at point W 02 = absolute dip at point W 2 +(h1+c2)×cosθ In (a) ＝(l2+λ Left side )×Sinθ Left side +2c×sinθ In (a) ＝(l2+λ Left side )×Sinθ Left side +2c×sin{arcsin[(|λ Left side -λ Right side |/l1)]}+c2;
The sedimentation data of points D, W, W02 and W03 are obtained, and a sedimentation curve is drawn according to the data;
All displacement sensors 2 and inclination sensors 6 are connected to a fiber bragg grating demodulator 10 through an optical cable 9, a power supply unit 11 supplies power to the fiber bragg grating demodulator 10, the fiber bragg grating demodulator 10 transmits collected data to a monitoring and early-warning platform 12 through wireless, the monitoring and early-warning platform 12 collects and processes the data to extract settlement information, a settlement curve is drawn, settlement trends are analyzed, the data are monitored according to preset data quality standards and rules, an alarm is immediately sent once the data are found to be abnormal or exceed a preset range, scientific basis is provided for safe operation and maintenance of a monitored structure, and the data can be sent to a remote monitoring center 13 and a mobile terminal 14 to timely perform accident early warning.
The present invention is not limited to the above embodiments, and any modifications, equivalent substitutions and improvements made by those skilled in the art within the scope of the present invention should be included in the scope of the present invention, and various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the present invention, so that the scope of the present invention is defined by the appended claims.
Claims (7)
1. The section settlement monitoring system based on the fiber bragg grating sensor is characterized by comprising a rigid support (1), a plurality of displacement sensors (2), a plurality of rigid stay wires (3), a plurality of monitoring anchor points (4), 2 inclinometry rigid beams (5), a plurality of inclination sensors (6), 2 inclinometry supporting legs (7), a plurality of hooked pulleys (8), an optical cable (9), a fiber bragg grating demodulator (10), a power supply unit (11), a monitoring and early warning platform (12), a remote monitoring center (13) and a mobile terminal (14);
The device comprises a rigid support (1), at least two inclination angle sensors (6), a plurality of displacement sensors (2) arranged at intervals on a settlement rigid beam (102) of the rigid support (1) are connected with the monitoring anchor points (4) through rigid stay wires (3), at least 1 inclination angle sensor (6) is arranged on the bottom of the inclination rigid beam (5), notches (502) formed in the end parts of the inclination rigid beam (5) are provided with hooked pulleys (8), and the displacement sensors (2) arranged on the inclination rigid beam (5) are fixed on the hooked pulleys (8) through the rigid stay wires (3);
All displacement sensors (2) and inclination sensors (6) are used for acquiring settlement data within the range of the settlement rigid beam (102), all displacement sensors (2) and inclination sensors (6) are connected to the fiber bragg grating demodulator (10) through the optical cable (9), the power supply unit (11) provides power for the fiber bragg grating demodulator (10), the fiber bragg grating demodulator (10) transmits acquired data to the monitoring and early warning platform (12) through wireless, the monitoring and early warning platform (12) acquires and processes the data, extracts settlement information, draws a settlement curve, analyzes settlement trend, monitors the data according to preset data quality standards and rules, gives an alarm immediately once the data is abnormal or exceeds the preset range, provides scientific basis for safe operation and maintenance of a monitored structure, and can also send the data to the remote monitoring center (13) and the mobile terminal (14) for accident early warning in time.
2. The fiber bragg grating sensor-based section settlement monitoring system according to claim 1, wherein the rigid support (1) is of a portal structure and comprises a settlement rigid beam (102), 2 simple support legs (101) positioned at two ends of the settlement rigid beam (102), a strip-shaped base (103) is arranged at the bottoms of the 2 simple support legs (101), first rotating shafts (104) are respectively arranged at the central positions of the 2 simple support legs (101) connected with the settlement rigid beam (102), the first rotating shafts (104) penetrate through first shaft holes (501) formed in the inclinometry rigid beam (5), and the rigid support (1) and the inclinometry rigid beam (5) can flexibly rotate around the first rotating shafts (104).
3. The fiber bragg grating sensor-based section settlement monitoring system according to claim 2, wherein a second rotating shaft (702) is arranged on the upper portion of an inclinometry support leg column (701) of the inclinometry support leg (7), the second rotating shaft (702) can flexibly slide in the notch (502), a plate-shaped bottom plate (703) is arranged at the bottom of the inclinometry support leg column (701), and the hooked pulley (8) is fixed on the second rotating shaft (702).
4. A fiber grating sensor-based section settlement monitoring system as claimed in claim 3, wherein the simply supported leg (101), the settlement rigid beam (102) and the inclinometry leg (7) are all square rod-like or plate-like structures.
5. The section settlement monitoring system based on the fiber bragg grating sensor, which is disclosed by claim 4, is characterized in that the monitoring anchor point (4) comprises a mounting base (401), a fixed connection device (402) is arranged on the mounting base (401), and the mounting base (401) of the monitoring anchor point (4) and a monitored component are firmly fixed with the ground in a mode of expanding screws, embedding and bearing platform manufacturing.
6. The fiber bragg grating sensor-based section settlement monitoring system according to claim 4, wherein the hooked pulley block (8) comprises a lifting hook (8-01), a pulley shaft (8-02), a bearing (8-03) and a bearing sleeve (8-04), the lifting hook (8-01) is fixed on the outer diameter of the bearing sleeve (8-04), the bearing sleeve (8-04) is embedded on the bearing (8-03), and the bearing (8-03) is in rolling connection with the pulley shaft (8-02).
7. A fiber bragg grating sensor-based section settlement monitoring method, which is realized by the fiber bragg grating sensor-based section settlement monitoring system according to any one of claims 1 to 6, and is characterized by comprising the following steps:
Step S1, setting a section settlement monitoring system on a section with settlement risk, wherein the section settlement monitoring system is arranged on a section with settlement risk, the sections with the requirements of section settlement monitoring are arranged on a lower key road section with tunnel crossing, a lower road with culvert construction and a cast-in-situ box girder support, the base (103) is simply supported by the ground on two sides of a settlement monitoring area, the center line of the simple support leg (101) is vertical to the ground at a measurement starting position, the 2 inclinometry support legs (7) are arranged on a set horizontal position without settlement and are distributed on the outer sides of the 2 simple support legs (101), the center line of the inclinometry support legs (7) is vertical to the ground, and the center line of a settlement rigid girder (102) is vertical to the ground;
step S2, setting the center point of a left first rotating shaft (104) as a point A, the center point of a right first rotating shaft (104) as a point B, the point A projected to the lower plane of a simple support base (103) as a point D, the point B projected to the lower plane of the simple support base (103) as a point C, the center point of a left second rotating shaft (702) of a inclinometry supporting leg (7) as a point E, the center point of a right second rotating shaft (702) of the inclinometry supporting leg (7) as a point F, the point E projected to the lower plane of a bottom plate (703) as a point H, the point F projected to the lower plane of the bottom plate (703) as a point G, the center point of a left first displacement sensor as a point W1, the center point of a left second displacement sensor as a point W2..A, the center point W1 projected to the lower plane of a monitoring anchor point as a point W01, and the center point of a left second displacement sensor as a point projected to the lower plane of the monitoring anchor point as a point W02;
Step S3, knowing the initial measurement position ad=bc=eh=fg=h 1;AB＝CD＝l1,AE＝BF＝l2, the uniform gap of the displacement meters on the settlement rigid beam (102) is a, W 1W01＝W2W02. =c;
Step S4, when subsidence occurs between AD and BC, the horizontal line inclination angle of a left inclination angle sensor (6) is measured on a left inclination rigid beam (5) to be theta Left side , the horizontal line inclination angle of a left displacement sensor (2) is measured to be theta Right side , the horizontal line inclination angle of the left inclination angle sensor (6) and the horizontal line of a right inclination rigid beam (5) is measured to be theta Right side , the left displacement sensor (2) is measured to be lambda Right side , and the data measured by the displacement sensor (2) on a subsidence rigid beam (102) are respectively c 1、c2 from left to right.
The calculation can be carried out as follows:
AE=l2+λ Left side ,BF＝l2+λ Right side ;
point a sink = point D sink= (l 2+λ Left side )×Sinθ Left side ;
point B sink = point C sink= (l 2+λ Right side )×Sinθ Right side ;
The calculation results are that:
AB and horizontal angle θ In (a) ＝arcsin[(|λ Left side -λ Right side |)/l1 ];
sinθ In (a) ＝(|λ Left side -λ Right side |)/l1;
point W 1 sink with respect to point a = c x sin θ In (a) ＝c×[(|λ Left side -λ Right side |)/l1 ];
Point W 2 sink with respect to point a = 2c x sin θ In (a) ＝2c×[(|λ Left side -λ Right side |)/l1 ];
......
Absolute dip at point W 1 = dip at point a + dip at point W 1 = (l 2+λ Left side )×Sinθ Left side +c×[(|λ Left side -λ Right side |)/l1) relative to dip at point a;
Absolute dip at point W 2 = dip at point a + dip at point W 2 = (l 2+λ Left side )×Sinθ Left side +2c×[(|λ Left side -λ Right side |)/l1) relative to dip at point a;
......
According to the sedimentation rule, W 1 and W 01、W2 and W 02. It is not considered along AD the projection position in the BC direction can generate relative sliding;
Absolute dip at point W 01 = absolute dip at point W 1 +(h1+c1)×cosθ In (a) ＝(l2+λ Left side )×Sinθ Left side +c×sinθ In (a) +＝(l2+λ Left side )×Sinθ Left side +c×sin{arcsin[(|λ Left side -λ Right side |/l1)]}+c1;
Absolute dip at point W 02 = absolute dip at point W 2 +(h1+c2)×cosθ In (a) ＝(l2+λ Left side )×Sinθ Left side +2c×sinθ In (a) ＝(l2+λ Left side )×Sinθ Left side +2c×sin{arcsin[(|λ Left side -λ Right side |/l1)]}+c2;
The settlement data of each point D, W, W02 and W03 can be obtained, a settlement curve is drawn according to the settlement data, all displacement sensors (2) and inclination sensors (6) are connected to a fiber bragg grating demodulator (10) through optical cables (9), a power supply unit (11) supplies power to the fiber bragg grating demodulator (10), the fiber bragg grating demodulator (10) transmits the collected data to a monitoring and early warning platform (12) in a wireless mode, the monitoring and early warning platform (12) collects and processes the data to extract settlement information, the settlement curve is drawn, settlement trends are analyzed, the data are monitored according to preset data quality standards and rules, an alarm is immediately sent once the data are found to be abnormal or exceed a preset range, scientific basis is provided for safe operation and maintenance of a monitored structure, and the data can be sent to a remote monitoring center (13) and a mobile terminal (14) to early warn accidents in time.
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