CN113340269B - Method for testing reference cable strand linearity in strong wind environment - Google Patents

Method for testing reference cable strand linearity in strong wind environment Download PDF

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CN113340269B
CN113340269B CN202110639449.2A CN202110639449A CN113340269B CN 113340269 B CN113340269 B CN 113340269B CN 202110639449 A CN202110639449 A CN 202110639449A CN 113340269 B CN113340269 B CN 113340269B
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strand
cable strand
span
reference cable
sensor
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CN113340269A (en
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代百华
黄灿
朱金柱
郑建新
朱浩
周浩
王永威
周仁忠
王紫超
李�浩
李焜耀
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CCCC Second Harbor Engineering Co
CCCC Wuhan Harbour Engineering Design and Research Institute Co Ltd
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CCCC Second Harbor Engineering Co
CCCC Wuhan Harbour Engineering Design and Research Institute Co Ltd
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C1/00—Measuring angles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00—Measuring inclination, e.g. by clinometers, by levels

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The invention discloses a method for testing the linearity of a reference cable strand in a strong wind environment, which comprises the steps of distributing an optical fiber sensor and an inclination angle sensor on the reference cable strand in the strong wind environment, testing the transverse swing amplitude of the reference cable strand along a cable and the transverse inclination angle of the reference cable strand at the midspan position, and obtaining the actual elevation of the midspan of the reference cable strand in a windless state through calculation, thereby obtaining the linearity of the reference cable strand. The invention solves the problem that the elevation of the reference cable strand can not be measured or the precision is too poor in the strong wind environment, and improves the work efficiency and precision of the erection of the reference cable strand.

Description

Method for testing reference cable strand linearity in strong wind environment
Technical Field
The invention relates to the field of suspension bridge cable strand erection measurement. More specifically, the invention relates to a method for testing the alignment of a reference cable strand in a strong wind environment.
Background
The main cable is a main bearing component of the suspension bridge and is also a life line of the suspension bridge. It is difficult to eliminate various construction errors in each stage of erection of the suspension bridge, and once the main cable is erected, the length of the main cable cannot be adjusted, so the main cable must be accurately calculated before erection and strictly controlled in the process of strand erection, and an ideal main cable alignment can be obtained. The line shape of the reference strand is a key ring in the process of erecting the main cable, and the accuracy of the line shape of the main cable directly determines the line shape accuracy of the main cable, so that the line shape testing method and the accuracy of the reference strand are particularly important.
The traditional reference strand linear testing method is as follows: the method comprises the steps of setting a test reference point on the shore, arranging a prism at the midspan position of a reference cable strand, erecting a total station at one point on the shore, looking back at a reference control point on the shore, aiming at the prism arranged on the reference cable strand, and testing the midspan elevation of the reference cable strand. The method depends on good measuring environment, namely, a measuring point is not shielded, the wind speed is low, rain mist does not exist, and the like, but under severe environments such as valleys, typhoon areas, heavy mist and the like, the problems that the test cannot be performed or the precision is poor can occur.
At present, the bridge site of a part of large-span suspension bridge is in 6-7 grade wind environment all the year round, and the cable adjusting work can not be carried out after a reference cable strand is put into a saddle until a good test environment is met. Therefore, it is necessary to find a reference strand linear test method in a strong wind environment to solve the above-mentioned defects.
Disclosure of Invention
The invention aims to provide a method for testing the linearity of a reference strand in a strong wind environment, and provides an indirect measurement method for the elevation of the reference strand, aiming at the defects and shortcomings of the traditional method for testing the elevation of the reference strand of a suspension bridge, namely, the actual elevation of the reference strand in a span is obtained in a windless state by testing the transverse swing of the reference strand along a cable and the transverse deflection angle of the span strand and adopting a corresponding algorithm.
To achieve these objects and other advantages in accordance with the present invention, there is provided a method for testing the linearity of a reference strand in a high wind environment, including distributing an optical fiber sensor and an inclination sensor on the reference strand in the high wind environment, testing the transverse swing of the reference strand along a cable and the transverse inclination of the reference strand at a midspan, and calculating to obtain the actual elevation of the reference strand at the midspan in a windless state, thereby obtaining the linearity of the reference strand.
Preferably, the specific steps comprise:
step 1: after the reference cable strand is pulled, arranging an optical fiber sensor on each span, arranging an inclination angle sensor in each span, fixing the optical fiber sensor and the inclination angle sensor on the top surface of the reference cable strand along the cable strand, respectively monitoring the transverse swing amplitude of each span of the reference cable strand in a windy environment, and respectively monitoring the transverse inclination angle of each span of the reference cable strand in transverse swing;
step 2: after the reference cable strand is shaped into a saddle and cable adjustment is not carried out, installing a plurality of optical time domain reflectometers which are respectively connected with the optical fiber sensor connectors on each span in a one-to-one correspondence mode at the tower top of the suspension bridge tower, carrying out debugging work of a test system to check whether the optical fiber sensors are intact, carrying out data initialization simultaneously, and connecting each inclination angle sensor to the optical time domain reflectometers;
and step 3: when the benchmark cable strand is erected at night, any time segment t is collected1～t2Time domain signal data of the fiber optic sensor and the tilt sensor on each span in windy conditions, where t2-t1Less than or equal to 10min, and demodulating the transverse inclination angle [ theta ] of the reference cable strand according to the demodulation algorithm of the modulator in the optical time domain reflectometer1、θ2.....θn]And transverse amplitude of oscillation [ h1、h2.....hn]；
And 4, step 4: according to the above-mentioned transverse inclination angle [ theta ]1、θ2.....θn]And transverse amplitude of oscillation [ h1、h2.....hn]Obtaining the mid-span sag f by adopting a numerical solution methodi＝hi/sin(θi)(i＝1,2……n)；
And 5: for any time ti(t1≤ti≤t2) Sag f of the midspani( i 1,2 … … n) and optimizing the sag f0Is obtained by using least square algorithm
Figure BDA0003106623860000021
Minimum optimum sag value f0Designing elevation Y according to left fulcrum of suspension bridge tower on two sides of each spanLAnd the design elevation Y of the right fulcrumRThe elevation Y of each span of the reference cable strand can be calculated0＝(YL+YR)/2-f0And obtaining the actual reference cable strand shape on site.
Preferably, the optical fiber sensor is a distributed optical fiber sensor.
Preferably, the fiber optic sensor is secured to the top surface of the reference strand along the strand by a wrap tape and an adhesive tape.
Preferably, the tilt sensor is fixed to the top surface of the reference strand along the strand by a twisted ribbon or a screw.
The invention at least comprises the following beneficial effects:
the test method breaks through the limitation of the traditional direct measurement method of the total station, obtains the mid-span elevation of the reference strand in the windless state by testing the transverse swing amplitude of the reference strand along the cable and the transverse deflection angle of the mid-span strand in the windy state and adopting the corresponding algorithm, solves the problem that the elevation of the reference strand in the windless environment cannot be measured or is poor in precision, and improves the erection work efficiency and precision of the reference strand.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic view of an indirect measurement of suspension bridge reference strand elevation of the present invention;
FIG. 2 is a schematic view of the installation location of the first and second optical fibers of the present invention;
FIG. 3 is a schematic illustration of the baseline strand sag calculation of the present invention in windy conditions;
FIG. 4 is a schematic diagram of the calculation of the mid-span altitude of the reference cable strand in the windless state.
Description of reference numerals:
1. suspension bridge pylon, 2, benchmark strand, 3, optical fiber sensor, 4, tilt angle sensor, 5, optical time domain reflectometer.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Examples
As shown in fig. 1 to 4, the method of the invention adopts a distributed optical fiber sensor 3 to test the transverse swing of a reference strand 2 along a cable and the transverse deflection angle of a midspan strand, and adopts a corresponding algorithm to obtain the actual elevation of the midspan of the reference strand 2 in a windless state, and specifically comprises the following steps:
step 1: after the reference cable strand 2 is pulled, arranging a distributed optical fiber sensor 3 along the cable at each span, and fixing the distributed optical fiber sensor 3 on the top surface of the reference cable strand 2 along the cable strand by adopting a silk winding belt and a special adhesive tape; the distributed optical fiber sensor 3 is used for monitoring the transverse vibration conditions of the left side span, the middle span and the right side span of the reference cable strand 2 in a windy environment. A tilt angle sensor 4 is arranged in each span and is fixed on the top surface of the reference cable strand 2 by adopting a filament winding belt or a special screw rod; the inclination angle sensor 4 is used for monitoring the inclination angle condition of the reference cable strand 2 during the transverse swinging at the left side span, the middle span and the right side span in the windy environment. The arrangement of the structures is shown in fig. 1 and 2.
Step 2: after the reference cable strand 2 is shaped into a saddle and when cable adjustment is not carried out, an optical time domain reflector 5 (comprising an optical transmitter, an optical receiver, an acousto-optic modulator, a data acquisition card and the like) is arranged at the top of the suspension bridge tower 1 and connected with the joint of the optical fiber sensor 3, debugging work of a test system is carried out, and the optical fiber is debugged through the optical fiber demodulator so as to check the integrity of the optical fiber sensor 3 and carry out data initialization; the optical time domain reflectometer 5 is also connected with the tilt angle sensor 4 and is used for acquiring data monitored by the tilt angle sensor 4.
And step 3: when the reference cable strand 2 is erected at night, any small time segment t is collected1～t2(preferably t is taken)2-t1Less than or equal to 10min) in windy state, demodulating the transverse inclination angle [ theta ] of the reference cable strand 2 according to a modulator demodulation algorithm1、θ2.....θn]And transverse amplitude of oscillation [ h1、h2.....hn](n is specifically determined by the sampling frequency), as shown in FIG. 3.
And 4, step 4: according to the above-mentioned transverse inclination angle [ theta ]1、θ2.....θn]And transverse amplitude of oscillation [ h1、h2.....hn]By adopting a numerical solution method, the cross-medial sag f can be obtainedi＝hi/sin(θi)(i＝1,2……n)。
And 5: for any time ti(t1≤ti≤t2) Sag f of the midspani( i 1,2 … … n) and optimizing the sag f0Is obtained by using least square algorithm
Figure BDA0003106623860000041
Minimum optimum sag value f0. Designing elevation Y according to left fulcrumLAnd right fulcrum YRAs shown in FIG. 4, the elevation Y of the span of the reference strand 2 can be calculated0＝(YL+YR)/2-f0To obtain the actual reference cable on siteThe strands are 2 linear.
Step 6: according to the steps 1-5, mid-span elevation testing work of the two side-span datum cable strands 2 can be completed.
The testing method in the embodiment is applied to a main span 320m suspension bridge, and the obtained reference strand linear shape is compared with the linear shape obtained by a conventional total station testing method, so that the testing precision of the method can be obtained, as shown in the following table 1, the testing precision is within the range of +/-2 mm, and the testing requirement of the on-site reference strand linear shape can be met.
Figure BDA0003106623860000042
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (4)

1. The method for testing the linearity of the reference cable strand in the strong wind environment is characterized by comprising the steps of distributing an optical fiber sensor and an inclination angle sensor on the reference cable strand in the strong wind environment, testing the transverse swing amplitude of the reference cable strand along a cable and the transverse inclination angle of the reference cable strand at the midspan position, and obtaining the actual elevation of the midspan of the reference cable strand in the windless state through calculation so as to obtain the linearity of the reference cable strand;
the method comprises the following specific steps:
step 1: after the reference cable strand is pulled, arranging an optical fiber sensor on each span, arranging an inclination angle sensor in each span, fixing the optical fiber sensor and the inclination angle sensor on the top surface of the reference cable strand along the cable strand, respectively monitoring the transverse swing amplitude of each span of the reference cable strand in a windy environment, and respectively monitoring the transverse inclination angle of each span of the reference cable strand in transverse swing;
step 2: after the reference cable strand is shaped into a saddle and cable adjustment is not carried out, installing a plurality of optical time domain reflectometers which are respectively connected with the optical fiber sensor connectors on each span in a one-to-one correspondence mode at the tower top of the suspension bridge tower, carrying out debugging work of a test system to check whether the optical fiber sensors are intact, carrying out data initialization simultaneously, and connecting each inclination angle sensor to the optical time domain reflectometers;
and step 3: when the benchmark cable strand is erected at night, any time segment t is collected1～t2Time domain signal data of the fiber optic sensor and the tilt sensor on each span in windy conditions, where t2-t1Less than or equal to 10min, and demodulating the transverse inclination angle [ theta ] of the reference cable strand according to the demodulation algorithm of the modulator in the optical time domain reflectometer1、θ2.....θn]And transverse amplitude of oscillation [ h1、h2.....hn]；
And 4, step 4: according to the above-mentioned transverse inclination angle [ theta ]1、θ2.....θn]And transverse amplitude of oscillation [ h1、h2.....hn]Obtaining the mid-span sag f by adopting a numerical solution methodi＝hi/sin(θi)(i＝1,2......n)；
And 5: for any time ti(t1≤ti≤t2) Sag f of the midspani(i 1,2.. n), let the optimum sag f be0Is obtained by using least square algorithm
Figure FDA0003475945860000011
Minimum optimum sag value f0Designing elevation Y according to left fulcrum of suspension bridge tower on two sides of each spanLAnd the design elevation Y of the right fulcrumRThe elevation Y of each span of the reference cable strand can be calculated0＝(YL+YR)/2-f0And obtaining the actual reference cable strand shape on site.
2. The method for testing the alignment of a reference strand in a high wind environment of claim 1, wherein the fiber optic sensor is a distributed fiber optic sensor.
3. The method for testing the alignment of a reference strand in a high wind environment of claim 1, wherein the fiber optic sensor is secured to the top surface of the reference strand along the strand by a tape and a wrap.
4. The method for testing the alignment of a reference strand in a high wind environment of claim 1, wherein the tilt sensor is fixed to the top surface of the reference strand along the strand by a twisted ribbon or a screw.
CN202110639449.2A 2021-06-08 2021-06-08 Method for testing reference cable strand linearity in strong wind environment Active CN113340269B (en)

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CN107525496B (en) * 2017-07-27 2019-12-31 中铁大桥局集团有限公司 Device and method for measuring sag of cable of ultra-large span suspension bridge
CN109183617A (en) * 2018-08-28 2019-01-11 法尔胜泓昇集团有限公司 Cable strand for main cable containing carbon fiber composite material intelligent rib and installation method
CN109989351A (en) * 2019-04-24 2019-07-09 中交第二公路工程局有限公司 A kind of self-anchored suspension bridge Datum Strand linear control method
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