CN110553595A - Rhombic hanging basket construction monitoring method based on fiber bragg grating integration technology - Google Patents
Rhombic hanging basket construction monitoring method based on fiber bragg grating integration technology Download PDFInfo
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- CN110553595A CN110553595A CN201910673564.4A CN201910673564A CN110553595A CN 110553595 A CN110553595 A CN 110553595A CN 201910673564 A CN201910673564 A CN 201910673564A CN 110553595 A CN110553595 A CN 110553595A
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- hanging basket
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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
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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Abstract
The invention relates to a monitoring method for rhombic hanging basket construction based on a fiber bragg grating integration technology, which belongs to the technical field of hanging basket construction, wherein two ends of a packaged fiber bragg grating strain gauge are welded on the inner side of an I-shaped steel stressed main beam of a rhombic hanging basket main truss system through fixing parts, and the change of system stress of the rhombic hanging basket main truss is monitored in real time through the fiber bragg grating strain gauge; measuring the stretching amount of a hanging basket and hanging system, installing a fiber bragg grating displacement sensor beside a suspended mould suspension cable through a protection tube, fixing the protection tube on the side surface of the suspended mould suspension cable through a hoop, avoiding the protection tube from shaking due to the influence of external force, and monitoring the stretching amount of the hanging system in real time through the fiber bragg grating displacement sensor; the deformation amount of the mounting frame is measured, and the deformation amount of the mounting frame is monitored in real time through the fiber bragg grating inclinometer; monitoring data can be remotely viewed; the calibration can be done remotely.
Description
Technical Field
The invention relates to a rhombic hanging basket construction monitoring method based on a fiber bragg grating integration technology, and belongs to the technical field of hanging basket construction.
background
Construction monitoring is an important component of construction monitoring. The main content of the construction monitoring of the hanging basket method is to monitor the deflection change condition of each section of box girder in the construction process, effectively predict and control the plane position and elevation of each girder section, ensure the quality and safety of bridge construction, and monitor the construction of the large-span prestressed concrete bridge, which mainly comprises the contents of structure simulation calculation, linear monitoring, stress monitoring, temperature monitoring, crack monitoring and the like.
the hanging basket is a main device in cantilever construction, and can be divided into a truss type, a cable-stayed type, a profile steel type and a mixed type according to the structural form, the hanging basket construction is generally adopted for pouring of a box girder of a large-span variable cross-section continuous box girder bridge, the hanging basket construction has two basic forms of a triangle and a rhombus, and the hanging basket construction has advantages.
Disclosure of Invention
The invention provides a rhombic hanging basket construction monitoring method based on a fiber bragg grating integration technology, which aims to solve the technical problem of difficulty in bridge hanging basket construction monitoring, overcome the defects of high interference, inaccurate monitoring result and the like of the conventional electrical measurement method, and can effectively solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
A rhombic hanging basket construction monitoring method based on a fiber bragg grating integration technology comprises the following steps:
The method comprises the following steps: measuring the system stress of the rhombic hanging basket main truss, welding two ends of a fiber bragg grating strain sensor on the inner side of an I-shaped steel stressed main beam of the rhombic hanging basket main truss through a fixing piece by adopting an angle welding seam, and monitoring the change of the system stress of the rhombic hanging basket main truss in real time through the fiber bragg grating strain sensor;
Step two: measuring the stretching amount of a diamond-shaped hanging basket hanging system, installing a fiber bragg grating displacement sensor beside a hanging die suspension cable through a protection tube, fixing the protection tube on the side surface of the hanging die suspension cable through a hoop, avoiding the protection tube from shaking due to the influence of external force, and monitoring the stretching amount of the hanging system in real time through the fiber bragg grating displacement sensor;
step three: the deformation amount of the rhombic hanging basket mounting frame is measured, the mounting frame is located at the top of a hanging system, a detection channel steel is mounted on the inner side of the channel steel below the two ends of the mounting frame, a fiber grating inclinometer is mounted in the detection channel steel, the fiber grating inclinometer is connected with the detection channel steel through an angle welding seam, and the deformation amount of the mounting frame is measured through the fiber grating inclinometer.
Step four: the fiber grating strain sensor, the fiber grating displacement sensor and the fiber grating inclinometer are connected with the monitoring terminal host through optical cables, so that demodulation, calculation and recording of monitoring data are facilitated, and the monitoring data can be checked in real time.
Further, in the first step, the fiber grating strain sensor is a tension sensor made of uniform periodic fiber gratings, and the measuring range is 0-700 tons.
Further, in the second step, the fiber grating displacement sensor is a rebound linear chirp fiber grating wide-range displacement sensor, and the range is 82.5 mm.
Furthermore, in the second step, the bottom of the protection tube is funnel-shaped, the upper end of the protection tube is composed of a movable tube and a fixed tube, the movable tube and the fixed tube are connected together through movable threads, the fiber grating displacement sensor is installed in the fixed tube, a detection head of the fiber grating displacement sensor is abutted against a chassis, and the chassis is arranged on the lower hanging die.
Further, in the third step, the fiber grating inclinometer adopts a Blazed fiber grating inclinometer with a measuring range of 15 °.
The invention has the beneficial effects that: the method has simple installation means and stronger anti-interference capability; monitoring data are digitized, the states of the hanging baskets can be monitored in real time or historically traced, and the monitoring data can be remotely checked; the maintenance cost is low, the calibration is simple and convenient, and the remote calibration can be realized.
Drawings
the accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic diagram of the overall construction structure of a rhombic hanging basket.
FIG. 2 is a side cross-sectional view and a side view of the fiber grating strain sensor mounting on the diamond cradle main truss of the present invention.
FIG. 3 is a schematic view of the installation of the fiber grating displacement sensor on the suspended mode suspension cable in the suspension system of the present invention.
FIG. 4 is a schematic view of the fiber grating inclinometer mounted on the diamond cradle mount of the present invention.
reference numbers in the figures: i, hanging a basket main truss in a diamond shape; 1. a fiber grating strain sensor; 1-1, I-shaped steel stress main beam; 1-2, fixing parts; 1-3, fillet weld; II, hanging a basket hanging system; 2. hanging a mould suspension cable; 3. lower hoisting the mould; 4. a fiber grating displacement sensor; 5. protecting the tube; 5-1, a movable tube; 5-2, a funnel-shaped protective cover; 5-3, a chassis; 6. hooping; III, hanging a basket mounting rack; 7. mounting a channel steel; 8. detecting channel steel; 9. fiber grating inclinometer.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Referring to fig. 1-4, a monitoring method for construction of a rhombic hanging basket based on fiber grating integration technology comprises the following steps: measuring the system stress of a diamond-shaped hanging basket main truss I, welding two ends of a fiber bragg grating strain sensor 1 to the inner side of an I-shaped steel stress main beam 1-1 of the diamond-shaped hanging basket main truss I through a fixing piece 1-2 by adopting an angle welding seam 1-3, and monitoring the change of the system stress of the diamond-shaped hanging basket main truss I in real time through the fiber bragg grating strain sensor 1;
When the temperature rises, the solid can generate a linear expansion phenomenon, the stress magnitude and the linear length of the solid are in a linear relation, and when the external force is not changed, the relation between the stress magnitude and the temperature is as follows:
F1＝F0+kt；
Wherein k represents the expansion coefficient, F 0 represents the stress magnitude of the solid at 0 ℃, F 1 represents the stress magnitude at the temperature of t ℃, however, the actually measured stress magnitude is the sum of the stress F x caused by the external force and the stress F 1 caused by the temperature change, namely:
F＝Fx+F1；
And finally:
Fx＝F-F01+kt；
Indicating the stress due to the weight of the suspension system.
Measuring the stretching amount of a diamond-shaped hanging basket hanging system II, installing an optical fiber grating displacement sensor 4 beside a hanging die suspension cable 2 through a protection tube 5, fixing the protection tube 5 on the side surface of the hanging die suspension cable 2 through a hoop 6, avoiding the protection tube 5 from shaking due to the influence of external force, and monitoring the stretching amount of the hanging system in real time through the optical fiber grating displacement sensor 4;
The deformation quantity of the rhombic hanging basket mounting frame III is measured, the mounting frame is located at the top of a hanging system, a detection channel steel 8 is installed on the inner side of a channel steel 7 below the two ends of the mounting frame III, a fiber grating inclinometer 9 is installed inside the detection channel steel 8, the fiber grating inclinometer 9 and the detection channel steel 8 are connected through fillet welds 1-3, and the deformation quantity of the mounting frame is measured through the fiber grating inclinometer 9.
set up the monitoring terminal host computer, the monitoring terminal host computer has 2 way ADC inputes, 2 RS485 interfaces, 1 RS232 interface, 1 way far-distance communication, 1 way GPS location and 2 way DO interfaces, with fiber grating strain sensor 1, fiber grating displacement sensor 4 and fiber grating inclinometer 9 all through the optical cable with the monitoring terminal host computer connect, communication distance is longer and the signal is stable, the transmission of the monitoring data of being convenient for, 1 way far-distance communication interface can external long-range supervisory equipment for the control is more high-efficient.
The fiber grating strain sensor 1 is a tension sensor made of uniform periodic fiber gratings, and the measuring range is 0-700 tons.
The fiber grating displacement sensor 4 is a rebound linear chirp fiber grating wide-range displacement sensor, and the range is 82.5 mm.
the bottom of protection tube 5 be hopper-shaped, the upper end of protection tube 5 constitute by activity pipe 5-1 and fixed pipe 5-2, just activity pipe 5-1 and fixed pipe 5-2 between together through movable threaded connection, fiber grating displacement sensor 4 install in fixed pipe 5-2, and fiber grating displacement sensor 4's detecting head butt on chassis 5-3, chassis 5-3 is settled down and is hung mould 3.
The fiber grating inclinometer 9 adopts a Blazed fiber grating inclinometer with the measuring range of 15 degrees.
the anchor ear 6 is tightly fixed on the suspension cable, the anchor ear 6 cannot rotate on the suspension cable, the anchor ear 6 on the side surface of the protection tube 5 is movable, the relative horizontal position of the fiber grating displacement sensor 4 cannot be influenced by the change of the suspension model suspension cable 2, and the fiber grating displacement sensor 4 can adjust the position of the fiber grating displacement sensor in the vertical direction along with the height of the movable tube 5-1.
Hang basket mounting bracket III and be located the rhombus and hang basket suspension system top the 7 inboard installation detection channel-section steels 8 of both ends below channel-section steel of mounting bracket III, install fiber grating inclinometer 9 in the inside that detects channel-section steels 8, fiber grating inclinometer 9 comprises inclinometer pipe and fiber grating bending sensor, its theory of operation is through setting up two fiber grating on fiber grating bending sensor circumferencial direction, lateral displacement or the deformation of the bending deformation fitting inclinometer pipe through fiber grating bending sensor to measure the deformation volume of hanging basket mounting bracket III.
The method has simple installation means and stronger anti-interference capability; monitoring data are digitized, the states of the hanging baskets can be monitored in real time or historically traced, and the monitoring data can be remotely checked; the maintenance cost is low, the calibration is simple and convenient, and the remote calibration can be realized.
After each nacelle extension, each sensor does not need to be recalibrated but needs to be cleared, the current zero value is recorded, the system expansion capability is strong, and other monitoring instruments such as an anemometer and the like can be added for other monitoring.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (5)
1. a rhombic hanging basket construction monitoring method based on a fiber bragg grating integration technology is characterized by comprising the following steps:
The method comprises the following steps: measuring the system stress of a rhombic hanging basket main truss (I), welding two ends of a fiber bragg grating strain sensor (1) on the inner side of an I-shaped steel stress main beam (1-1) of the rhombic hanging basket main truss (I) through fixing pieces (1-2) by adopting fillet welds (1-3), and monitoring the change of the system stress of the rhombic hanging basket main truss (I) in real time through the fiber bragg grating strain sensor (1);
Step two: measuring the stretching amount of a diamond-shaped hanging basket hanging system (II), installing an optical fiber grating displacement sensor (4) beside a hanging die suspension cable (2) through a protection tube (5), fixing the protection tube (5) on the side surface of the hanging die suspension cable (2) through a hoop (6), avoiding the protection tube (5) from shaking due to the influence of external force, and monitoring the stretching amount of the hanging system in real time through the optical fiber grating displacement sensor (4);
step three: the deformation amount of the rhombic hanging basket mounting frame (III) is measured, the mounting frame is located at the top of a hanging system, a detection channel steel (8) is installed on the inner side of a channel steel (7) below the two ends of the mounting frame (III), a fiber grating inclinometer (9) is installed inside the detection channel steel (8), an angle welding seam (1-3) is adopted to connect the fiber grating inclinometer (9) with the detection channel steel (8), and the deformation amount of the mounting frame is measured through the fiber grating inclinometer (9).
step four: the fiber grating strain sensor (1), the fiber grating displacement sensor (4) and the fiber grating inclinometer (9) are connected with the monitoring terminal host through optical cables, so that demodulation, calculation and recording of monitoring data are facilitated, and the monitoring data can be checked in real time.
2. The monitoring method for the construction of the rhombic hanging basket based on the fiber bragg grating integration technology according to claim 1 is characterized in that: in the first step, the fiber grating strain sensor (1) is a tension sensor made of uniform periodic fiber gratings, and the measuring range is 0-700 tons.
3. The monitoring method for the construction of the rhombic hanging basket based on the fiber bragg grating integration technology according to claim 1 is characterized in that: in the second step, the fiber grating displacement sensor (4) is a rebound linear chirp fiber grating wide-range displacement sensor (4), and the range is 82.5 mm.
4. The monitoring method for the construction of the rhombic hanging basket based on the fiber bragg grating integration technology according to claim 1 is characterized in that: in the second step, the bottom of the protection tube (5) is funnel-shaped, the upper end of the protection tube (5) is composed of a movable tube (5-1) and a fixed tube (5-2), the movable tube (5-1) and the fixed tube (5-2) are connected together through movable threads, the fiber grating displacement sensor (4) is installed in the fixed tube (5-2), a detection head of the fiber grating displacement sensor (4) is abutted to the chassis (5-3), and the chassis (5-3) is arranged on the lower hanging die (3).
5. The monitoring method for the construction of the rhombic hanging basket based on the fiber bragg grating integration technology according to claim 1 is characterized in that: in the third step, the fiber grating inclinometer (9) adopts a Blazed fiber grating inclinometer with the measuring range of 15 degrees.
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| CN201910673564.4A CN110553595A (en) | 2019-07-24 | 2019-07-24 | Rhombic hanging basket construction monitoring method based on fiber bragg grating integration technology |
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| CN201910673564.4A CN110553595A (en) | 2019-07-24 | 2019-07-24 | Rhombic hanging basket construction monitoring method based on fiber bragg grating integration technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113108833A (en) * | 2021-03-23 | 2021-07-13 | 中煤科工开采研究院有限公司 | Hydraulic support welding seam monitoring system and hydraulic support |
| CN113654748A (en) * | 2021-10-19 | 2021-11-16 | 山东润龙轴承有限公司 | Hang basket structure amount of deflection monitoring facilities |
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| CN204128526U (en) * | 2014-09-26 | 2015-01-28 | 上海城建市政工程（集团）有限公司 | Be positioned at the displacement transducer mounting structure hung on mould suspension cable |
| CN105839549A (en) * | 2016-05-20 | 2016-08-10 | 中国水利水电第十工程局有限公司 | Truss type cantilever construction hanging basket |
| CN106381814A (en) * | 2016-11-21 | 2017-02-08 | 宁波交通工程建设集团有限公司 | Cast-in-cantilever structure of movable crane formwork of zigzag-form steel web continuous box beam and construction method of cast-in-cantilever structure |
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2019
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Patent Citations (4)
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|---|---|---|---|---|
| CN104264589A (en) * | 2014-09-26 | 2015-01-07 | 上海城建市政工程（集团）有限公司 | Real-time monitoring method for hanging basket states |
| CN204128526U (en) * | 2014-09-26 | 2015-01-28 | 上海城建市政工程（集团）有限公司 | Be positioned at the displacement transducer mounting structure hung on mould suspension cable |
| CN105839549A (en) * | 2016-05-20 | 2016-08-10 | 中国水利水电第十工程局有限公司 | Truss type cantilever construction hanging basket |
| CN106381814A (en) * | 2016-11-21 | 2017-02-08 | 宁波交通工程建设集团有限公司 | Cast-in-cantilever structure of movable crane formwork of zigzag-form steel web continuous box beam and construction method of cast-in-cantilever structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113108833A (en) * | 2021-03-23 | 2021-07-13 | 中煤科工开采研究院有限公司 | Hydraulic support welding seam monitoring system and hydraulic support |
| CN113654748A (en) * | 2021-10-19 | 2021-11-16 | 山东润龙轴承有限公司 | Hang basket structure amount of deflection monitoring facilities |
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Application publication date: 20191210 |
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