Railways Exam > Railways Questions > Weisbach triangle method is used fora)Determi...
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Weisbach triangle method is used for
- a)Determining the height of the bridge
- b)Connecting two ends of an underground tunnel
- c)Determining the deviation angle on the curve of a railway track
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Weisbach triangle method is used fora)Determining the height of the br...
Weisbach triangle method is used for connecting two ends of an underground tunnel as shown in the figure below.
In this method two wires are suspended vertically in a shaft forming a very small base line. The principal is to obtain bearing and coordinate of the wire base relative to the surface base. These values can then be transferred to the underground base.
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Weisbach triangle method is used fora)Determining the height of the br...
Weisbach triangle method is a surveying technique used to connect two ends of an underground tunnel. This method involves the use of trigonometry to calculate the horizontal and vertical angles needed to connect the two points.
Explanation:
The Weisbach triangle method is based on the following steps:
1. Setting up the base line: The first step is to set up a base line between the two ends of the tunnel. This base line is usually a straight line that connects the two points on the surface.
2. Measuring the angles: The next step is to measure the horizontal and vertical angles between the base line and the two points on the surface. This is done using a theodolite, which is a surveying instrument used to measure angles.
3. Calculating the coordinates: Once the angles are measured, they are used to calculate the coordinates of the two points on the surface. This is done using trigonometry and the Weisbach triangle method.
4. Marking the points: After the coordinates are calculated, the two points on the surface are marked. These marks serve as reference points for excavation.
5. Excavating the tunnel: Finally, the tunnel is excavated between the two reference points. The excavation process is guided by the marks on the surface and the use of surveying techniques to ensure that the tunnel is dug in the right direction and at the right angle.
Conclusion:
The Weisbach triangle method is a useful surveying technique for connecting two ends of an underground tunnel. It is based on the principles of trigonometry and involves the use of a theodolite to measure angles. The method is particularly useful for tunnels that have a relatively long distance between the two ends, as it allows for accurate excavation and alignment.
Explanation:
The Weisbach triangle method is based on the following steps:
1. Setting up the base line: The first step is to set up a base line between the two ends of the tunnel. This base line is usually a straight line that connects the two points on the surface.
2. Measuring the angles: The next step is to measure the horizontal and vertical angles between the base line and the two points on the surface. This is done using a theodolite, which is a surveying instrument used to measure angles.
3. Calculating the coordinates: Once the angles are measured, they are used to calculate the coordinates of the two points on the surface. This is done using trigonometry and the Weisbach triangle method.
4. Marking the points: After the coordinates are calculated, the two points on the surface are marked. These marks serve as reference points for excavation.
5. Excavating the tunnel: Finally, the tunnel is excavated between the two reference points. The excavation process is guided by the marks on the surface and the use of surveying techniques to ensure that the tunnel is dug in the right direction and at the right angle.
Conclusion:
The Weisbach triangle method is a useful surveying technique for connecting two ends of an underground tunnel. It is based on the principles of trigonometry and involves the use of a theodolite to measure angles. The method is particularly useful for tunnels that have a relatively long distance between the two ends, as it allows for accurate excavation and alignment.
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Weisbach triangle method is used fora)Determining the height of the bridgeb)Connecting two ends of an underground tunnelc)Determining the deviation angle on the curve of a railway trackd)None of the aboveCorrect answer is option 'B'. Can you explain this answer? for Railways 2025 is part of Railways preparation. The Question and answers have been prepared according to the Railways exam syllabus. Information about Weisbach triangle method is used fora)Determining the height of the bridgeb)Connecting two ends of an underground tunnelc)Determining the deviation angle on the curve of a railway trackd)None of the aboveCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Railways 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Weisbach triangle method is used fora)Determining the height of the bridgeb)Connecting two ends of an underground tunnelc)Determining the deviation angle on the curve of a railway trackd)None of the aboveCorrect answer is option 'B'. Can you explain this answer?.
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