CN100395515C - Tension line video deflection measuring device and method - Google Patents
Tension line video deflection measuring device and method Download PDFInfo
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- CN100395515C CN100395515C CNB2006100950832A CN200610095083A CN100395515C CN 100395515 C CN100395515 C CN 100395515C CN B2006100950832 A CNB2006100950832 A CN B2006100950832A CN 200610095083 A CN200610095083 A CN 200610095083A CN 100395515 C CN100395515 C CN 100395515C
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Abstract
A method for measuring video deflection of tension line includes erecting fixed bolt and fixed pulley on piers at two sides of bridge, connecting two ends of tension line separately to said bolt and weight to make tension line be tightened, erecting video camera at position to be measured on bridge to let shooting tube right-point to tension line, moving video camera up and down to vary position of fixed light point of laser on tension line in image of video camera, collecting and calculating position of light point in image for obtaining deflection of bridge. The device for realizing said method is also disclosed.
Description
Technical field
The present invention relates to be used to detect and monitor the device and method of deflection of bridge span, can be used for also that land subsidence, massif are moved, building sinking etc., detected and monitoring, especially utilizes tension lines, laser and video system to carry out the method for amount of deflection on-line monitoring.
Background technology
Detect deflection of bridge span modern road and bridge health detection and monitoring in play an important role.In the prior art, the method and apparatus that is used to detect and monitor deflection of bridge span is more and more, though function is identical, structure is different.As Chinese patent 200310057473.6 disclosed " displacement/deflection detection and monitoring device and method " and Chinese patent 200510020324.2 disclosed " demarcating own coding imaging method multiple spot dynamic deflection/displacement measuring device certainly ", the former adopts man-to-man measurement, can't utilize a video camera shooting and measure a plurality of targets, increase the measurement cost greatly; The latter is because measurement range is very wide, and measuring accuracy can be very low, can't satisfy high-precision requirement.And for example photoelectricity liquid communicating pipe method detection deflection of bridge span temperature influence is very big, and error of calculation complexity.Disclosed 200510020375.5 " two dimensions; large range laser amount of deflection/displacement measurement method and device " of Chinese patent for another example, making the laser beam level of the tested locations of structures of reflection be mapped to hot spot by control controllable damping hinge arrangement receives on the measurement mechanism, form hot spot, through picture pick-up device to hot spot be marked as picture, calculate the relative distance of the centre of gravity place and the light emitting diode picture of laser facula again, obtain the coordinate of present hot spot, coordinate is deducted initial value, promptly obtain the shift value of present hot spot, draw by the two-dimension displacement of geodesic structure, the laser beam of this device can only level be mapped on the hot spot reception measurement mechanism, therefore generating laser and hot spot reception measurement mechanism must be on the same horizontal line, can't use for the place that the inclination angle is arranged, that installs and use is limited in scope, even on surface level, install, require the complete level of laser beam to be mapped to hot spot and receive the debugging of measurement mechanism and operate also very difficult.
Summary of the invention
At the prior art above shortcomings, the object of the present invention is to provide a kind of precision height, and Installation and Debugging are convenient, usable range is wide, can be for a long time, the tension line video deflection measuring device and the method for detection/monitoring deflection of bridge span at a distance.
The object of the present invention is achieved like this: the tension line video deflection measuring method, and it installs by the picture pick-up device that is connected with computing machine, the assembly that constitutes by set bolt, fixed pulley, weight and tension lines, and linear laser device and wing flats are formed.Measuring method may further comprise the steps:
1) installs and fixes bolt and fixed pulley respectively at the both sides of spanning to be measured bridge pier;
2) tension lines one end is connected with set bolt, the other end is walked around fixed pulley and is firmly linked to each other with weight, and weight is unsettled under the pulling of tension lines, and makes tension lines be in tensioned state;
3) need the point tested that picture pick-up device is installed on spanning, make its camera end over against tension lines, and keep suitable distance with tension lines, picture pick-up device links to each other with computing machine by computer interface;
4) demarcate multiplying power, be adjacent to tension lines and make the white line of demarcating target parallel with tension lines with the demarcation target, over against the picture pick-up device camera lens, the calibrating procedure in the operation computing machine detects and calculates multiplying power automatically and finishes the multiplying power demarcation;
5) the wire laser instrument is installed, make the linear laser of its formation basic vertical with tension lines and on tension lines little luminous point of formation, dot pattern looks like to be in the middle part of the image pickup scope;
6) at the tension lines opposite side relative wing flats is installed, is prevented to disturb with the camera lens of picture pick-up device;
7) when picture pick-up device generation upper and lower displacement, the corresponding variation will take place in the image that motionless luminous point forms by picture pick-up device on the tension lines, by light spot position in the image is gathered and computing, calculate the amount of deflection of bridge.
Compared to existing technology, the present invention has following advantage and characteristics:
1, precision height because the luminous point that forms on the tension lines is little, can be realized the sub-pixel location by computing machine, and its precision is better than ± 0.1mm;
2, the data of Cai Jiing reach computer via computer interface, are convenient to observe, and transmission process is convenient;
3, simple in structure, cheap for manufacturing cost;
4, Installation and Debugging are convenient;
5, can detect and monitor the change in displacement of any tested point, can the amount of deflection of various bridge be detected and monitor;
6, can detect and monitor the vibration situation of any moment measured point; And long-term displacement or amount of deflection and trend thereof; Can obtain information analysis at a distance by network;
7, can arrange a plurality of test points on same tension lines, simultaneously the amount of deflection variation of multiple spot be measured.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the scheme of installation of pick-up unit of the present invention and detection method;
Fig. 2 is the image synoptic diagram that this picture pick-up device receives;
Fig. 3 demarcates the target synoptic diagram.
Embodiment
As shown in Figure 1, tension line video deflection measuring method of the present invention, main device is the picture pick-up device 2 that is connected with computing machine 8; The assembly that constitutes by set bolt 1, fixed pulley 6, weight 7 and tension lines 3; And linear laser device 4 and wing flats 5,9 are connecting line.During installation, set bolt 1 and fixed pulley 6 are individually fixed in appropriate location on the bridge pier of bridge both sides, tension lines 3 one sides are fixed on the set bolt 1, and opposite side is walked around fixed pulley 6 and is connected with weight 7, makes tension lines 3 be in tensioned state.Picture pick-up device 2 is fixed in the tested point in the bridge span, and camera end is over against tension lines 3, and wing flats 5 places after the tension lines 3, makes picture pick-up device 2 can only shoot with video-corder tension lines 3 and wing flats 5.Linear laser device 4 is installed in above or below the tension lines 3, suitably adjusts laser instrument, makes linear laser device 4 vertical substantially with tension lines 3, thereby forms a little luminous point 11 on tension lines 3.
The method of deflection metrology may further comprise the steps: 1, install and fix bolt and fixed pulley respectively in bridge pier appropriate location, the both sides of spanning to be measured; 2, tension lines one end is fixed in set bolt, the other end is walked around fixed pulley and is firmly linked to each other with weight, and weight is unsettled under the pulling of tension lines, makes tension lines 3 be in tensioned state; 3, need the point tested that picture pick-up device is installed on spanning, make its camera end over against tension lines, and keep suitable distance with tension lines, picture pick-up device links to each other with computing machine by computer interface; 4, demarcate multiplying power, be adjacent to tension lines and make the white line of demarcating target parallel with tension lines with the demarcation target, over against the picture pick-up device camera lens, the calibrating procedure in the operation computing machine is finished multiplying power and is demarcated; 5, the wire laser instrument is installed, make the linear laser of its formation basic vertical with tension lines and on tension lines little luminous point of formation, luminous point is in the middle part of the image pickup scope; 6, at tension lines and the positive wing flats of installing of picture pick-up device, prevent to disturb.Linear laser device 4 can replace with other linear light source.7, when picture pick-up device generation upper and lower displacement, the corresponding variation will take place in the image that motionless luminous point forms by picture pick-up device on the tension lines, by light spot position in the image is gathered and computing, calculate the amount of deflection of bridge.Among Fig. 1, the 9th, connecting line; The 10th, linear laser; The 11st, luminous point on the line.
Referring to Fig. 2, when the displacement of tested point generation above-below direction, same displacement will take place in company with tested point in the picture pick-up device 2 that is fixed in tested point, and bridge pier is fixed in tension lines 3 both sides and pulled by weight, remain tensioned state, horizontal level is constant, and the upper-lower position that therefore projects the laser spot on the tension lines 3 is constant.Because upper and lower displacement has taken place picture pick-up device 2, therefore, the corresponding variation will take place in the image that motionless luminous point forms by picture pick-up device 2, by light spot position in the image is gathered and computing, can calculate the amount of deflection of bridge accordingly.
The principle of scaling method wherein: referring to Fig. 3, be close to tension lines and make the white line of demarcating target parallel with the demarcation target with tension lines, over against the picture pick-up device camera lens, computing machine is according to the pixel distance L between two white lines in the demarcation target image calculation image that imports into, demarcate on the target actual range D between two white lines according to measuring point, calculate A=L/D, demarcate thereby finish multiplying power.
Computing machine carries out the computing of light spot position after the light signal that collects is carried out pre-service, and compares with predefined null displacement point, calculate the displacement size of relative zero, and stored, and can draw the analysis data easily, the long-term tendency of the displacement of drawing.
Claims (2)
1. tension line video deflection measuring device, by the picture pick-up device (2) that is connected with computing machine (8), the assembly that constitutes by set bolt (1), fixed pulley (6), weight (7) and tension lines (3), and linear laser device (4) and wing flats (5) formation; Set bolt (1) and fixed pulley (6) are individually fixed on the bridge pier of bridge both sides, and tension lines (3) one sides are fixed on the set bolt (1), and opposite side is walked around fixed pulley (6) and is connected with weight (7), makes tension lines (3) be in tensioned state; Picture pick-up device (2) is fixed in the tested point in the bridge span, and camera end is over against tension lines (3), and wing flats (5) places tension lines (3) afterwards; Linear laser device (4) is installed in above or below the tension lines (3).
2. according to the measuring method of the described measurement mechanism of claim 1, may further comprise the steps:
1) installs and fixes bolt (1) and fixed pulley (6) respectively at the both sides of spanning to be measured bridge pier;
2) tension lines (3) one ends are connected with set bolt (1), the other end is walked around fixed pulley (6) and is firmly linked to each other with weight (7), and weight (7) is unsettled under the pulling of tension lines, and makes tension lines be in tensioned state;
3) need the point tested that picture pick-up device (2) is installed on spanning, make its camera end over against tension lines (3), and keep suitable distance with tension lines, picture pick-up device (2) links to each other with computing machine (8) by computer interface;
4) demarcate multiplying power, be adjacent to tension lines and make the white line of demarcating target parallel with tension lines with the demarcation target, over against the picture pick-up device camera lens, the calibrating procedure in the operation computing machine detects and calculates multiplying power automatically and finishes the multiplying power demarcation;
5) wire laser instrument (4) is installed, make the linear laser of its formation basic vertical with tension lines and on tension lines little luminous point of formation, luminous point is in the middle part of image pickup scope;
6) at tension lines (3) opposite side relative wing flats (5) is installed, is prevented to disturb with picture pick-up device (2) camera lens;
7) when picture pick-up device (2) generation upper and lower displacement, the corresponding variation will take place in the image that motionless luminous point forms by picture pick-up device (2) on the tension lines, by light spot position in the image is gathered and computing, calculate the amount of deflection of bridge.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100950832A CN100395515C (en) | 2006-08-31 | 2006-08-31 | Tension line video deflection measuring device and method |
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| CNB2006100950832A CN100395515C (en) | 2006-08-31 | 2006-08-31 | Tension line video deflection measuring device and method |
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| CN100395515C true CN100395515C (en) | 2008-06-18 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101451903B (en) * | 2008-12-26 | 2010-06-23 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Semi-closed single communication pipe type bridge deflection test device and method |
| CN102507599B (en) * | 2011-11-04 | 2013-09-18 | 长沙岱勒新材料科技有限公司 | Microscopic photographing system for linear product and detection method of linear product |
| CN105571506B (en) * | 2015-12-25 | 2018-02-06 | 北京尚水信息技术股份有限公司 | The method that bridge amount of deflection is surveyed in measurement |
| CN108375442B (en) * | 2018-01-19 | 2020-07-14 | 西北工业大学 | Device for measuring tension and swing angle of tether in non-contact manner |
| CN108584703B (en) * | 2018-07-18 | 2019-07-02 | 安徽工业大学 | Double girder overhead crane hoist and Main Girder Deflection on-line measurement system and its measurement method |
| CN110823175A (en) * | 2019-11-07 | 2020-02-21 | 河海大学 | Displacement high-frequency observation device and method based on multi-point reverse recognition technology |
| CN112945487A (en) * | 2021-01-28 | 2021-06-11 | 西南交通大学 | Bridge deflection measuring device and measuring method |
Citations (5)
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|---|---|---|---|---|
| DE4209491A1 (en) * | 1992-03-24 | 1993-09-30 | Siegmar Dr Hecht | Contactless measurement of static and dynamic deformation of micro-mechanical structures eg bridge or membrane - projecting laser line pattern perpendicular and at angles to surface and evaluating surface lines in real=time |
| JPH0949706A (en) * | 1995-08-08 | 1997-02-18 | Kishimoto Sangyo Kk | Method for measuring moving amount of object to be measured in front/rear direction with using laser light |
| CN1651855A (en) * | 2005-02-06 | 2005-08-10 | 重庆大学 | 2-D, large range laser deflection / displacement measuring method and apparatus |
| CN1664494A (en) * | 2005-03-23 | 2005-09-07 | 西安交通大学 | Laser dam safety monitoring method |
| CN1789905A (en) * | 2005-12-28 | 2006-06-21 | 张奔牛 | Apparatus and method for detecting and monitoring displacement/deflection |
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Patent Citations (5)
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|---|---|---|---|---|
| DE4209491A1 (en) * | 1992-03-24 | 1993-09-30 | Siegmar Dr Hecht | Contactless measurement of static and dynamic deformation of micro-mechanical structures eg bridge or membrane - projecting laser line pattern perpendicular and at angles to surface and evaluating surface lines in real=time |
| JPH0949706A (en) * | 1995-08-08 | 1997-02-18 | Kishimoto Sangyo Kk | Method for measuring moving amount of object to be measured in front/rear direction with using laser light |
| CN1651855A (en) * | 2005-02-06 | 2005-08-10 | 重庆大学 | 2-D, large range laser deflection / displacement measuring method and apparatus |
| CN1664494A (en) * | 2005-03-23 | 2005-09-07 | 西安交通大学 | Laser dam safety monitoring method |
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Non-Patent Citations (2)
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| 一种激光图像挠度测量方法. 董辉等.传感器技术，第23卷第10期. 2004 * |
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