[Discussion of the Day] Utility Engineering – Mechanical & Electrical – 20200913

1. After the location of long-distance transmission lines has been determined and inspected, the center piles for the foundations of the steel towers can be marked based on the actual positions of the starting and ending points, turning points, as well as any obstacles along the route. The allowable deviation for the alignment of these points is ±5 mm, while the allowable deviation for measuring the distance between the foundations is 1/2000. Once the center piles are identified, control is usually carried out using either the cross-line method or the parallel baseline method; this involves marking four positioning piles along the center line and its perpendicular direction at the location of the center piles, or marking an axis parallel to the center line on one side of it. The control piles should also be determined based on the center piles, with an allowable deviation of ±3 mm. 2. When using a steel tape for measuring distances, the measured length should not exceed 80 m, and at the same time, it should not be less than 20 m. 3. It should be ensured that the comprehensive error in the sag between the steel towers of an overhead power transmission line does not exceed a specified tolerance value; for a given section of such a line, the measured sight distance should not exceed 400 meters. 4. Measurement of long-span distances: Between large spans, electromagnetic wave ranging methods or analytical methods are typically used for measurement. Under normal circumstances, these methods can meet the requirements regarding the relative error in distance measurement.

1. After the location of long-distance transmission lines has been determined and inspected, the center piles for the foundations of the steel towers can be marked based on the actual positions of the starting and ending points, turning points, as well as any obstacles along the route. The allowable deviation for the alignment of these points is ±5 mm, while the allowable deviation for measuring the distance between the foundations is 1/2000. Once the center piles are identified, control is usually carried out using either the cross-line method or the parallel baseline method; this involves marking four positioning piles along the center line and its perpendicular direction at the location of the center piles, or marking an axis parallel to the center line on one side of it. The control piles should also be determined based on the center piles, with an allowable deviation of ±3 mm. 2. When using a steel tape for measuring distances, the measured length should not exceed 80 m, and at the same time, it should not be less than 20 m. 3. It should be ensured that the comprehensive error in the sag between the steel towers of an overhead power transmission line does not exceed a specified tolerance value; for a given section of such a line, the measured sight distance should not exceed 400 meters. 4. Measurement of long-span distances: Between large spans, electromagnetic wave ranging methods or analytical methods are typically used for measurement. Under normal circumstances, these methods can meet the requirements regarding the relative error in distance measurement.

1. After the location of long-distance transmission lines has been determined and inspected, the center piles for the foundations of the steel towers can be marked based on the actual positions of the starting and ending points, turning points, as well as any obstacles along the route. The allowable deviation for the alignment of these points is ±5 mm, while the allowable deviation for measuring the distance between the foundations is 1/2000. Once the center piles are identified, control is usually carried out using either the cross-line method or the parallel baseline method; this involves marking four positioning piles along the center line and its perpendicular direction at the location of the center piles, or marking an axis parallel to the center line on one side of it. The control piles should also be determined based on the center piles, with an allowable deviation of ±3 mm. 2. When using a steel tape for measuring distances, the measured length should not exceed 80 m, and at the same time, it should not be less than 20 m. 3. It should be ensured that the comprehensive error in the sag between the steel towers of an overhead power transmission line does not exceed a specified tolerance value; for a given section of such a line, the measured sight distance should not exceed 400 meters. 4. Measurement of long-span distances: Between large spans, electromagnetic wave ranging methods or analytical methods are typically used for measurement. Under normal circumstances, these methods can meet the requirements regarding the relative error in distance measurement.

1. After the location of long-distance transmission lines has been determined and inspected, the center piles for the foundations of the steel towers can be marked based on the actual positions of the starting and ending points, turning points, as well as any obstacles along the route. The allowable deviation for the alignment of these points is ±5 mm, while the allowable deviation for measuring the distance between the foundations is 1/2000. Once the center piles are identified, control is usually carried out using either the cross-line method or the parallel baseline method; this involves marking four positioning piles along the center line and its perpendicular direction at the location of the center piles, or marking an axis parallel to the center line on one side of it. The control piles should also be determined based on the center piles, with an allowable deviation of ±3 mm. 2. When using a steel tape for measuring distances, the measured length should not exceed 80 m, and at the same time, it should not be less than 20 m. 3. It should be ensured that the comprehensive error in the sag between the steel towers of an overhead power transmission line does not exceed a specified tolerance value; for a given section of such a line, the measured sight distance should not exceed 400 meters. 4. Measurement of long-span distances: Between large spans, electromagnetic wave ranging methods or analytical methods are typically used for measurement. Under normal circumstances, these methods can meet the requirements regarding the relative error in distance measurement.

1. After the location of long-distance transmission lines has been determined and inspected, the center piles for the foundations of the steel towers can be marked based on the actual positions of the starting and ending points, turning points, as well as any obstacles along the route. The allowable deviation for the alignment of these points is ±5 mm, while the allowable deviation for measuring the distance between the foundations is 1/2000. Once the center piles are identified, control is usually carried out using either the cross-line method or the parallel baseline method; this involves marking four positioning piles along the center line and its perpendicular direction at the location of the center piles, or marking an axis parallel to the center line on one side of it. The control piles should also be determined based on the center piles, with an allowable deviation of ±3 mm. 2. When using a steel tape for measuring distances, the measured length should not exceed 80 m, and at the same time, it should not be less than 20 m. 3. It should be ensured that the comprehensive error in the sag between the steel towers of an overhead power transmission line does not exceed a specified tolerance value; for a given section of such a line, the measured sight distance should not exceed 400 meters. 4. Measurement of long-span distances: Between large spans, electromagnetic wave ranging methods or analytical methods are typically used for measurement. Under normal circumstances, these methods can meet the requirements regarding the relative error in distance measurement.

1. After the location of long-distance transmission lines has been determined and inspected, the center piles for the foundations of the steel towers can be marked based on the actual positions of the starting and ending points, turning points, as well as any obstacles along the route. The allowable deviation for the alignment of these points is ±5 mm, while the allowable deviation for measuring the distance between the foundations is 1/2000. Once the center piles are identified, control is usually carried out using either the cross-line method or the parallel baseline method; this involves marking four positioning piles along the center line and its perpendicular direction at the location of the center piles, or marking an axis parallel to the center line on one side of it. The control piles should also be determined based on the center piles, with an allowable deviation of ±3 mm. 2. When using a steel tape for measuring distances, the measured length should not exceed 80 m, and at the same time, it should not be less than 20 m. 3. It should be ensured that the comprehensive error in the sag between the steel towers of an overhead power transmission line does not exceed a specified tolerance value; for a given section of such a line, the measured sight distance should not exceed 400 meters. 4. Measurement of long-span distances: Between large spans, electromagnetic wave ranging methods or analytical methods are typically used for measurement. Under normal circumstances, these methods can meet the requirements regarding the relative error in distance measurement.

1. After the location of long-distance transmission lines has been determined and inspected, the center piles for the foundations of the steel towers can be marked based on the actual positions of the starting and ending points, turning points, as well as any obstacles along the route. The allowable deviation for the alignment of these points is ±5 mm, while the allowable deviation for measuring the distance between the foundations is 1/2000. Once the center piles are identified, control is usually carried out using either the cross-line method or the parallel baseline method; this involves marking four positioning piles along the center line and its perpendicular direction at the location of the center piles, or marking an axis parallel to the center line on one side of it. The control piles should also be determined based on the center piles, with an allowable deviation of ±3 mm. 2. When using a steel tape for measuring distances, the measured length should not exceed 80 m, and at the same time, it should not be less than 20 m. 3. It should be ensured that the comprehensive error in the sag between the steel towers of an overhead power transmission line does not exceed a specified tolerance value; for a given section of such a line, the measured sight distance should not exceed 400 meters. 4. Measurement of long-span distances: Between large spans, electromagnetic wave ranging methods or analytical methods are typically used for measurement. Under normal circumstances, these methods can meet the requirements regarding the relative error in distance measurement.

1. After the location of long-distance transmission lines has been determined and inspected, the center piles for the foundations of the steel towers can be marked based on the actual positions of the starting and ending points, turning points, as well as any obstacles along the route. The allowable deviation for the alignment of these points is ±5 mm, while the allowable deviation for measuring the distance between the foundations is 1/2000. Once the center piles are identified, control is usually carried out using either the cross-line method or the parallel baseline method; this involves marking four positioning piles along the center line and its perpendicular direction at the location of the center piles, or marking an axis parallel to the center line on one side of it. The control piles should also be determined based on the center piles, with an allowable deviation of ±3 mm. 2. When using a steel tape for measuring distances, the measured length should not exceed 80 m, and at the same time, it should not be less than 20 m. 3. It should be ensured that the comprehensive error in the sag between the steel towers of an overhead power transmission line does not exceed a specified tolerance value; for a given section of such a line, the measured sight distance should not exceed 400 meters. 4. Measurement of long-span distances: Between large spans, electromagnetic wave ranging methods or analytical methods are typically used for measurement. Under normal circumstances, these methods can meet the requirements regarding the relative error in distance measurement

1. After the location of long-distance transmission lines has been determined and inspected, the center piles for the foundations of the steel towers can be marked based on the actual positions of the starting and ending points, turning points, as well as any obstacles along the route. The allowable deviation for the alignment of these points is ±5 mm, while the allowable deviation for measuring the distance between the foundations is 1/2000. Once the center piles are identified, control is usually carried out using either the cross-line method or the parallel baseline method; this involves marking four positioning piles along the center line and its perpendicular direction at the location of the center piles, or marking an axis parallel to the center line on one side of it. The control piles should also be determined based on the center piles, with an allowable deviation of ±3 mm. 2. When using a steel tape for measuring distances, the measured length should not exceed 80 m, and at the same time, it should not be less than 20 m. 3. It should be ensured that the comprehensive error in the sag between the steel towers of an overhead power transmission line does not exceed a specified tolerance value; for a given section of such a line, the measured sight distance should not exceed 400 meters. 4. Measurement of long-span distances: Between large spans, electromagnetic wave ranging methods or analytical methods are typically used for measurement. Under normal circumstances, these methods can meet the requirements regarding the relative error in distance measurement.