CN112857218A - Steel truss arch bridge construction line shape monitoring method based on three-dimensional laser scanning - Google Patents
Steel truss arch bridge construction line shape monitoring method based on three-dimensional laser scanning Download PDFInfo
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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
- G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
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Abstract
The invention provides a three-dimensional laser scanning-based steel truss arch bridge construction line shape monitoring method, which comprises the following steps of: step 1, arranging a bridge side three-dimensional laser scanner by using control points in a construction coordinate system; step 2, determining a bridge deck temporary control point; step 3, arranging a bridge deck three-dimensional laser scanner by using the temporary control points; step 4, extending the temporary control point along the longitudinal bridge direction by applying back intersection; step 5, carrying out multi-station rapid scanning of the bridge deck; step 6, synthesizing a point cloud picture of the steel truss arch bridge from the scanning result in point cloud processing software; and 7, extracting key coordinate information from the point cloud picture to realize linear real-time monitoring. And (3) sequentially adopting the steps 1-7 under different construction working conditions, and monitoring the linear change of the steel truss arch bridge construction under a plurality of working conditions. The invention can realize the quick, synchronous and accurate monitoring of the construction line shape of the steel truss arch bridge.
Description
Technical Field
The invention relates to the technical field of bridge construction monitoring, in particular to a three-dimensional laser scanning-based steel truss arch bridge structure construction line shape monitoring method.
Background
With the increasing traffic flow in recent years, bridge engineering is widely constructed in the world, and bridge construction technology is rapidly promoted. The bridge construction monitoring technology is one of important components of the bridge construction technology, and can ensure that the bridge structure meets the requirements of calculating the stress state and reasonably constructing the line shape in the construction process. The bridge construction line shape is often complicated and changeable due to the influence of complex conditions such as construction load, temperature load, wind load and the like, and the monitoring of the bridge construction line shape in actual engineering is very important. Therefore, in actual engineering, linear monitoring needs to be carried out on bridge structures under different construction working conditions.
In the bridge construction linear monitoring method, the total station method is widely used at present and is the simplest and most direct method, but the method has certain limitations, for example, one-time measurement of a coordinate at a certain position of a bridge structure cannot realize multi-structure cooperative monitoring, field measurement time is long, and the influence of wind effect and temperature effect on structure displacement is difficult to eliminate. In addition, some bridge construction linear monitoring devices such as laser range finders and GNSS positioning systems can accurately monitor the structural linearity of a certain part of a bridge, but still have the problems that the monitoring mode and the control network are complex, multi-structure synchronous monitoring cannot be realized, and the like.
Through retrieval, the Chinese patent invention with the publication number of CN107289903A provides a linear bridge cantilever method construction linear continuous measurement monitoring system and a monitoring method, and a plurality of laser range finders are utilized to cooperatively work to realize the linear monitoring of the bridge cantilever end construction, but only the linear monitoring of the bridge cantilever end structure in bridge construction is realized.
The invention discloses a Chinese patent publication No. CN109781057A, which discloses a railway continuous beam bridge construction linear monitoring system and a measuring method, wherein a Beidou positioning system, an inclination monitoring system and a handheld mobile terminal are utilized to cooperatively measure the spatial coordinates of the construction end face of a railway continuous beam bridge and uniformly send the spatial coordinates to a data management subsystem, but only the linear monitoring of the end face of the beam bridge is realized, and the monitoring related mode is slightly complex.
Therefore, a method for monitoring the construction line shape of the steel truss arch bridge based on three-dimensional laser scanning is needed, the three-dimensional laser scanning is reasonably carried out on the steel truss arch bridge, a point cloud picture of a monitoring target under different construction working conditions is synthesized, the rapid and synchronous monitoring of the construction line shape of the steel truss arch bridge is realized, and the construction of the steel truss arch bridge structure according to the correct line shape is ensured.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for monitoring the construction line shape of a steel truss arch bridge based on three-dimensional laser scanning, which can quickly, synchronously and accurately monitor the construction line shape of the steel truss arch bridge.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention provides a three-dimensional laser scanning-based steel truss arch bridge construction line shape monitoring method, which comprises the following steps of:
the following steps are carried out:
And 2, measuring the three-dimensional coordinates of the temporary control points on the bridge deck by using the three-dimensional laser scanner at the bridge side.
And 3, taking the temporary control point as a rear viewpoint, obtaining the coordinates of the three-dimensional laser scanner placing points around the temporary control point by rear intersection, and carrying out rapid scanning on the steel truss arch bridge surface.
And 4, measuring the three-dimensional coordinates of the new temporary control points by using a three-dimensional laser scanner positioned on the bridge floor, so that the new temporary control points and the original temporary control points are longitudinally arranged along the bridge floor.
And 5, taking the new temporary control point as a rear viewpoint, obtaining the coordinates of the three-dimensional laser scanner placing points around the new temporary control point by rear intersection, and continuously carrying out rapid scanning on the steel truss arch bridge structure on the steel truss arch bridge floor.
And 6, importing multi-station scanning results of the three-dimensional laser scanner into point cloud processing software, aligning the overlapping parts of the cloud pictures of different stations in pairs, and synthesizing the multi-station scanning results into a point cloud picture of the steel truss arch bridge.
And 7, extracting key coordinate information from the steel truss arch bridge point cloud picture, comparing structural design coordinate values, finding out structural linear change in the construction in time, and realizing rapid real-time monitoring of the steel truss arch bridge line shape.
Preferably, in all steps of the method for monitoring the construction line shape of the steel truss arch bridge based on the three-dimensional laser scanning, the construction control point is arranged at the pier of the steel truss arch bridge with negligible settlement.
Preferably, in all steps of the method for monitoring the construction line shape of the steel truss arch bridge based on three-dimensional laser scanning, the steel truss arch, the steel truss girder and the bridge deck are synchronously constructed by adopting a cantilever construction method in the construction process of the steel truss arch bridge.
Preferably, in all steps of the three-dimensional laser scanning-based steel truss arch bridge construction line shape monitoring method, the three-dimensional laser scanning monitoring precision can reach millimeter level, and the scanning mode does not affect the monitoring precision basically.
Preferably, the three-dimensional laser scanning monitoring method can realize rapid, synchronous and accurate linear monitoring of multiple positions in the construction process of the steel truss arch bridge.
Preferably, the three-dimensional laser scanning monitoring method can synthesize an accurate steel truss arch bridge point cloud picture by using a multi-station scanning result.
Preferably, the step 7 specifically includes the following steps:
and 7.1, extracting point coordinate information of the key part from the point cloud picture by using point cloud processing software.
And 7.2, extracting point coordinates of the same part from the structural design drawing, and comparing the difference value of the two coordinates X, Y, Z values to judge whether the construction line shape of the steel truss arch bridge structure meets the design requirement.
Further, the steel truss arch bridge can monitor the construction linear changes of the steel truss bridge under multiple working conditions according to the steps 1-7 of the three-dimensional laser scanning monitoring method in sequence under different construction working conditions.
In conclusion, compared with the prior art, the invention has the following beneficial effects:
the invention is a brand new method in the monitoring of the construction line shape of the steel truss arch bridge, a three-dimensional laser scanner is utilized to reasonably convert construction control points in a construction coordinate system, the position of the scanner is reasonably arranged based on the control points, and a point cloud picture of the steel truss arch bridge is synthesized by multi-point position fast scanning, thereby realizing the fast, synchronous and accurate monitoring of the line shape of the steel truss arch bridge under different construction working conditions.
The method can quickly, synchronously and accurately monitor the construction line shape of the steel truss arch bridge, discover the influence of complex conditions such as construction load, temperature load, wind load and the like on the main structure of the steel truss arch bridge in time, and ensure that the steel truss arch bridge structure is constructed according to the reasonable construction line shape.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments 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. In the drawings:
FIG. 1 is a schematic layout of a three-dimensional laser scanner for linear monitoring in steel truss arch bridge construction in the embodiment;
FIG. 2 is a schematic view of a three-dimensional laser scanner conversion control point at the bridge side in the embodiment;
FIG. 3 is a schematic diagram of three-dimensional laser scanner conversion control points on a bridge deck in an embodiment;
in the figure: 1-three-dimensional laser scanner at the bridge side, 2-three-dimensional laser scanner on the bridge floor, 3-construction control points and 4-temporary control points; 5-new temporary control points, 6-bridge decks, 7-steel trussed beams, 8-steel trussed arches and 9-sling towers.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1, 2 and 3, a method for monitoring the construction alignment of a steel truss arch bridge based on three-dimensional laser scanning comprises the following steps in sequence: step 1, arranging a three-dimensional laser scanner 1 at the side of a bridge at a construction control point 3; step 2, determining a temporary control point 4 on the bridge deck; step 3, arranging the three-dimensional laser scanner 2 on the bridge deck by using the temporary control points 4; step 4, the temporary control point 4 longitudinally extends to a new temporary control point 5 along the bridge deck 6 by applying back intersection; step 5, rapidly scanning the bridge deck at multiple stations by using the three-dimensional laser scanner 2 on the bridge deck; step 6, synthesizing a structural point cloud picture from the scanning results in point cloud processing software; and 7, extracting key coordinate information from the point cloud picture to realize linear real-time monitoring.
As shown in fig. 1 and 2, in the embodiment, the construction control point 3 of the steel truss arch bridge is arranged at a pier where settlement is negligible, so that the construction control point 3 needs to be derived to the temporary control point 4 on the bridge deck 6 by using the three-dimensional laser scanner 1 at the side of the bridge.
In the construction process of the steel truss arch bridge in the embodiment, the bridge deck 6, the steel truss girder 7 and the steel truss arch 8 are constructed synchronously by adopting a cantilever construction method. Therefore, the bridge surface three-dimensional laser scanning device 2 is more advantageous than the bridge side three-dimensional laser scanning device 1 in monitoring the target structure, the scanning precision is greatly improved due to the shortened scanning distance, the performance requirement on the 3D laser scanner is relatively reduced, and the practical applicability is enlarged. Meanwhile, the steel truss arch bridge point cloud image contains dense point cloud data at key positions, and the point cloud data at non-key positions are relatively sparse, so that the structural line shape monitoring precision is improved, and the processing and analysis of a point cloud model by a computer are facilitated.
When the three-dimensional laser scanner monitors the construction process of the steel truss arch bridge structure, the three-dimensional laser scanner 2 on the bridge floor is placed on the bridge floor, the distance between the three-dimensional laser scanner and a scanning object can be freely adjusted, the monitoring precision can reach millimeter level, and the scanning mode basically does not affect the monitoring precision; a plurality of scanner placing points are determined on the side of the bridge and the bridge floor by the temporary control points 4 and the new temporary control points 5, and the linear real-time monitoring of multiple positions of the steel truss arch bridge can be realized by multi-station measurement, multi-station scanning result synthesis and point coordinate extraction of key positions, wherein the linear real-time monitoring mainly comprises a bridge deck 6, a steel truss arch 8 and a sling tower 9.
In the embodiment, under different construction working conditions, the steel truss arch bridge is synthesized into a plurality of steel truss arch bridge point cloud charts according to the steps 1-7 in sequence, and the monitoring of the linear change of the steel truss arch bridge construction under a plurality of working conditions can be realized.
The embodiment is used for monitoring the construction line shape of the steel truss arch bridge, can quickly, synchronously and accurately monitor the structural line shape of the steel truss arch bridge under different construction working conditions, timely discovers the influence of complex conditions such as construction load, temperature load, wind load and the like on the structure of the steel truss arch bridge, and ensures that the steel truss arch bridge is constructed according to a reasonable construction line shape.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. After reading the above, those skilled in the art will make various changes and modifications within the scope of the appended claims without affecting the spirit of the invention.
Claims (9)
1. A steel truss arch bridge construction line shape monitoring method based on three-dimensional laser scanning is characterized by comprising the following steps of:
step 1, taking a construction control point positioned at a pier or a bearing platform as a reference, placing a three-dimensional laser scanner at a bridge side, performing rear-view intersection through two control points, and calculating a three-dimensional coordinate of the three-dimensional laser scanner.
And 2, measuring the three-dimensional coordinates of the temporary control points on the bridge deck by using the three-dimensional laser scanner at the bridge side.
And 3, taking the temporary control point as a rear viewpoint, obtaining the coordinates of the three-dimensional laser scanner placing points around the temporary control point by rear intersection, and carrying out rapid scanning on the steel truss arch bridge surface.
And 4, measuring the three-dimensional coordinates of the new temporary control points by using a three-dimensional laser scanner positioned on the bridge floor, so that the new temporary control points and the original temporary control points are longitudinally arranged along the bridge floor.
And 5, taking the new temporary control point as a rear viewpoint, obtaining the coordinates of the three-dimensional laser scanner placing points around the new temporary control point by rear intersection, and continuously carrying out rapid scanning on the steel truss arch bridge structure on the steel truss arch bridge floor.
And 6, importing multi-station scanning results of the three-dimensional laser scanner into point cloud processing software, aligning the overlapping parts of the cloud pictures of different stations in pairs, and synthesizing the multi-station scanning results into a point cloud picture of the steel truss arch bridge.
And 7, extracting key coordinate information from the steel truss arch bridge point cloud picture, comparing structural design coordinate values, finding out structural linear change in the construction in time, and realizing rapid real-time monitoring of the steel truss arch bridge line shape.
2. The method for monitoring the construction alignment of the steel truss arch bridge based on the three-dimensional laser scanning according to all the steps of claim 1, wherein the construction control point is arranged at the pier of the steel truss arch bridge with negligible settlement.
3. The method for monitoring the construction alignment of the steel truss arch bridge based on the three-dimensional laser scanning according to all the steps of claim 1, wherein the steel truss arch, the steel truss girder and the bridge deck are constructed synchronously by adopting a cantilever construction method in the construction process of the steel truss arch bridge.
4. The method for monitoring the construction line shape of the steel truss arch bridge based on the three-dimensional laser scanning according to all the steps of claim 1, wherein the three-dimensional laser scanning monitoring precision can reach millimeter level, and the scanning mode does not affect the monitoring precision basically.
5. The method for monitoring the construction alignment of the steel truss arch bridge based on the three-dimensional laser scanning according to all the steps of claim 1, wherein the alignment monitoring at multiple positions is realized rapidly, synchronously and accurately in the construction process of the steel truss arch bridge.
6. The method for monitoring the construction line shape of the steel truss arch bridge based on the three-dimensional laser scanning according to all the steps of claim 1, wherein the three-dimensional laser scanning monitoring method can utilize a multi-station scanning result to synthesize an accurate point cloud picture of the steel truss arch bridge.
7. The method for monitoring the construction alignment of the steel truss arch bridge based on the three-dimensional laser scanning according to all the steps of claim 1, wherein the step 7 specifically comprises the following steps:
and 7.1, extracting point coordinate information of the key part from the point cloud picture by using point cloud processing software.
And 7.2, extracting point coordinates of the same part from the structural design drawing, and comparing the difference value of the two coordinates X, Y, Z values to judge whether the construction line shape of the steel truss arch bridge structure meets the design requirement.
8. The method for monitoring the construction linear shape of the steel truss arch bridge based on the three-dimensional laser scanning according to all the steps of claim 1, wherein the steel truss arch bridge is used for monitoring the construction linear shape change of the steel truss arch bridge under a plurality of working conditions according to the steps 1-7 in sequence under different construction working conditions.
9. The method for monitoring the linear change of the steel truss arch bridge based on the three-dimensional laser scanning as recited in claim 8, wherein the rapid, synchronous and accurate monitoring of the construction linear of the steel truss arch bridge can be realized.
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Cited By (3)
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| CN114720041A (en) * | 2022-03-23 | 2022-07-08 | 东南大学 | Method for monitoring construction cable force change of arch bridge suspender based on three-dimensional laser scanning |
| CN114777727A (en) * | 2022-06-17 | 2022-07-22 | 长安大学 | Steel truss chord member three-dimensional deformation monitoring and early warning device and installation method thereof |
| CN116147484A (en) * | 2023-02-27 | 2023-05-23 | 东南大学 | Bridge service line shape identification method based on multipoint cloud fusion |
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| CN114720041B (en) * | 2022-03-23 | 2024-04-23 | 东南大学 | Arch bridge suspender construction cable force change monitoring method based on three-dimensional laser scanning |
| CN114777727A (en) * | 2022-06-17 | 2022-07-22 | 长安大学 | Steel truss chord member three-dimensional deformation monitoring and early warning device and installation method thereof |
| CN116147484A (en) * | 2023-02-27 | 2023-05-23 | 东南大学 | Bridge service line shape identification method based on multipoint cloud fusion |
| CN116147484B (en) * | 2023-02-27 | 2024-04-30 | 东南大学 | Bridge service line shape identification method based on multipoint cloud fusion |
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