摘要 :
This paper introduces the application of photogrammetric methods in trenchless engineering applications including construction jobsite monitoring and three-dimensional underground utility mapping. Accurate three-dimensional repres...
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This paper introduces the application of photogrammetric methods in trenchless engineering applications including construction jobsite monitoring and three-dimensional underground utility mapping. Accurate three-dimensional representations of buildings, roads, and other utilities on the jobsite can be easily obtained through the processing of digital photographs using photogrammetric software. This provides an avenue for assisting contractors in quality control of their construction processes. The existence of telecommunication, electrical, cable, water, wastewater, and gas pipelines provide potential strike hazards for trenchless methods such as horizontal directional drilling. Subsequently, it is imperative that accurate as-built maps be generated. This paper demonstrates the use of digital photogrammetric methods through field trail of mapping and monitoring applications.
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摘要 :
This paper introduces the application of photogrammetric methods in trenchless engineering applications including construction jobsite monitoring and three-dimensional underground utility mapping. Accurate three-dimensional repres...
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This paper introduces the application of photogrammetric methods in trenchless engineering applications including construction jobsite monitoring and three-dimensional underground utility mapping. Accurate three-dimensional representations of buildings, roads, and other utilities on the jobsite can be easily obtained through the processing of digital photographs using photogrammetric software. This provides an avenue for assisting contractors in quality control of their construction processes. The existence of telecommunication, electrical, cable, water, wastewater, and gas pipelines provide potential strike hazards for trenchless methods such as horizontal directional drilling. Subsequently, it is imperative that accurate as-built maps be generated. This paper demonstrates the use of digital photogrammetric methods through field trail of mapping and monitoring applications.
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摘要 :
A primary concern of owners specifying trenchless installation and rehabilitation methods are surface movements during construction. Surface heave or settlement can occur as a result of contractor methodology, design, or geotechni...
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A primary concern of owners specifying trenchless installation and rehabilitation methods are surface movements during construction. Surface heave or settlement can occur as a result of contractor methodology, design, or geotechnical conditions. Performing quality assurance during and after construction provides owners with an understanding of what surface movements have occurred and if remedial action may be required. Traditional methods utilized to assess ground surface movement include: surveying triangulation, geometric leveling, and GPS surveying. This paper presents a procedure to utilize photogrammetry in the measuring of ground movements, and examines its accuracy on real world trenchless projects. By utilizing consumer grade digital SLR cameras, photogrammetry does not require highly trained personnel, takes less time and costs less money than traditional methods. Previous research determined that photogrammetry produced precise three-dimensional measurements of specific points on the ground's surface. However, for photogrammetry to be an acceptable means of quality assurance, it must also be proven accurate. Accuracy will be determined by comparing measurements taken with photogrammetry to those taken with traditional rod and level. Measurements were taken before, during, and after each installation in order to fully capture any changes in ground movement. The results are compiled and analyzed to determine the accuracy of photogrammetry in measuring ground movements.
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摘要 :
A primary concern of owners specifying trenchless installation and rehabilitation methods are surface movements during construction. Surface heave or settlement can occur as a result of contractor methodology, design, or geotechni...
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A primary concern of owners specifying trenchless installation and rehabilitation methods are surface movements during construction. Surface heave or settlement can occur as a result of contractor methodology, design, or geotechnical conditions. Performing quality assurance during and after construction provides owners with an understanding of what surface movements have occurred and if remedial action may be required. Traditional methods utilized to assess ground surface movement include: surveying triangulation, geometric leveling, and GPS surveying. This paper presents a procedure to utilize photogrammetry in the measuring of ground movements, and examines its accuracy on real world trenchless projects. By utilizing consumer grade digital SLR cameras, photogrammetry does not require highly trained personnel, takes less time and costs less money than traditional methods. Previous research determined that photogrammetry produced precise three-dimensional measurements of specific points on the ground's surface. However, for photogrammetry to be an acceptable means of quality assurance, it must also be proven accurate. Accuracy will be determined by comparing measurements taken with photogrammetry to those taken with traditional rod and level. Measurements were taken before, during, and after each installation in order to fully capture any changes in ground movement. The results are compiled and analyzed to determine the accuracy of photogrammetry in measuring ground movements.
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摘要 :
One concern associated with trenchless construction techniques is surface heave or settlement. Surface movements can damage pavements and other structures. Traditional methods of assessing surface damage have involved visual walko...
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One concern associated with trenchless construction techniques is surface heave or settlement. Surface movements can damage pavements and other structures. Traditional methods of assessing surface damage have involved visual walkovers or total station survey. These techniques require physical access to the area and require time to complete and compile data to determine what has occurred during the monitoring event. While LIDAR can also be utilized to accurately map a surface,it is relatively cost prohibitive to undertake. Photogrammetry is a remote sensing technique in which the geometric properties of objects and surfaces can be determined from photographic images. This process enables accurate three-dimensional measurements of specific points on the ground surface. Measurements are determined utilizing two or more photographs taken from different positions simultaneously at specific time intervals. Photographs from specific time intervals are then complied using photogrammetry software to determine the position of surface points in three-dimensional space within a few minutes. Comparing photographs from different time intervals during the construction process allows the user to monitor surface movements,in almost real time conditions. This technique provides a cost effective,accurate,and timely methodology for inspectors to conduct quality control on trenchless projects and assess surface heave and settlement. This paper outlines the procedure developed to perform quality control measurements utilizing photogrammetric techniques on trenchless projects,discusses calibration procedures,and summaries an exercise in determining the precision of this measurement technique.
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摘要 :
One concern associated with trenchless construction techniques is surface heave or settlement. Surface movements can damage pavements and other structures. Traditional methods of assessing surface damage have involved visual walko...
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One concern associated with trenchless construction techniques is surface heave or settlement. Surface movements can damage pavements and other structures. Traditional methods of assessing surface damage have involved visual walkovers or total station survey. These techniques require physical access to the area and require time to complete and compile data to determine what has occurred during the monitoring event. While LIDAR can also be utilized to accurately map a surface,it is relatively cost prohibitive to undertake. Photogrammetry is a remote sensing technique in which the geometric properties of objects and surfaces can be determined from photographic images. This process enables accurate three-dimensional measurements of specific points on the ground surface. Measurements are determined utilizing two or more photographs taken from different positions simultaneously at specific time intervals. Photographs from specific time intervals are then complied using photogrammetry software to determine the position of surface points in three-dimensional space within a few minutes. Comparing photographs from different time intervals during the construction process allows the user to monitor surface movements,in almost real time conditions. This technique provides a cost effective,accurate,and timely methodology for inspectors to conduct quality control on trenchless projects and assess surface heave and settlement. This paper outlines the procedure developed to perform quality control measurements utilizing photogrammetric techniques on trenchless projects,discusses calibration procedures,and summaries an exercise in determining the precision of this measurement technique.
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摘要 :
The development of the device is detecting of drilling parameters in the vertical angel bole. As one of advanced research in CCSD-1, the function Is to research the measure of detecting the vertex angle, tool face orientation, tem...
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The development of the device is detecting of drilling parameters in the vertical angel bole. As one of advanced research in CCSD-1, the function Is to research the measure of detecting the vertex angle, tool face orientation, temperature and mud pressure hi the bore while drilling. The element analysis, physical design, software and hardware exploitation have been achievement. Meanwhile, we have proceeded drilling experiment in CCSD-1 by this device, most valuable data are acquirement.
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