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Why was a coil chosen over a straight for this overbridge?
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up vote
1
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I saw this meme on Facebook showing a coiled railway overbridge and an alternative plan. I replied that straightening that overbridge will force it to start at the other side of the road, and you need to build a u-turn and there is a valuable building off the frame. Is the coil rational, and why?
bridges rail
asked 2 hours ago
aitchnyu
1635
add a comment |Â
up vote
1
down vote
favorite
I saw this meme on Facebook showing a coiled railway overbridge and an alternative plan. I replied that straightening that overbridge will force it to start at the other side of the road, and you need to build a u-turn and there is a valuable building off the frame. Is the coil rational, and why?
bridges rail
asked 2 hours ago
aitchnyu
1635
add a comment |Â
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I saw this meme on Facebook showing a coiled railway overbridge and an alternative plan. I replied that straightening that overbridge will force it to start at the other side of the road, and you need to build a u-turn and there is a valuable building off the frame. Is the coil rational, and why?
bridges rail
asked 2 hours ago
aitchnyu
1635
I saw this meme on Facebook showing a coiled railway overbridge and an alternative plan. I replied that straightening that overbridge will force it to start at the other side of the road, and you need to build a u-turn and there is a valuable building off the frame. Is the coil rational, and why?
bridges rail
bridges rail
asked 2 hours ago
aitchnyu
1635
asked 2 hours ago
aitchnyu
1635
asked 2 hours ago
aitchnyu
1635
asked 2 hours ago
aitchnyu
1635
asked 2 hours ago
aitchnyu
1635
1635
add a comment |Â
add a comment |Â
1 Answer
1
active
oldest
votes
up vote
3
down vote
source google maps
The distance between the intersection and the rail is 100m, The road would need to rise about 10m to clear the track. This would mean a average grade of 10%. However you also need to account for the vertical curve in the road so the max grade would be quite a bit higher.
The max grade allowed for non-local roads in the US is about 8% (the place in question is in Pakistan). This appears to be a connecting road that replaces a on-grade railway crossing a bit further east.
With this design you also have a lot more span that you can cross under next to the rails for future development.
answered 1 hour ago
ratchet freak
4,273814
And to probably help reduce the speed of approach to the junction...
– Solar Mike
1 hour ago
Could you also answer why they didn't use an extended straight ramp but with a legal grade?
– aitchnyu
1 hour ago
@aitchnyu extended to where? because that would not physically fit, which would result in either the trains crashing into the span or a lip at the intersection.
– ratchet freak
45 mins ago
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
3
down vote
source google maps
The distance between the intersection and the rail is 100m, The road would need to rise about 10m to clear the track. This would mean a average grade of 10%. However you also need to account for the vertical curve in the road so the max grade would be quite a bit higher.
The max grade allowed for non-local roads in the US is about 8% (the place in question is in Pakistan). This appears to be a connecting road that replaces a on-grade railway crossing a bit further east.
With this design you also have a lot more span that you can cross under next to the rails for future development.
answered 1 hour ago
ratchet freak
4,273814
And to probably help reduce the speed of approach to the junction...
– Solar Mike
1 hour ago
Could you also answer why they didn't use an extended straight ramp but with a legal grade?
– aitchnyu
1 hour ago
@aitchnyu extended to where? because that would not physically fit, which would result in either the trains crashing into the span or a lip at the intersection.
– ratchet freak
45 mins ago
add a comment |Â
up vote
3
down vote
source google maps
The distance between the intersection and the rail is 100m, The road would need to rise about 10m to clear the track. This would mean a average grade of 10%. However you also need to account for the vertical curve in the road so the max grade would be quite a bit higher.
The max grade allowed for non-local roads in the US is about 8% (the place in question is in Pakistan). This appears to be a connecting road that replaces a on-grade railway crossing a bit further east.
With this design you also have a lot more span that you can cross under next to the rails for future development.
answered 1 hour ago
ratchet freak
4,273814
And to probably help reduce the speed of approach to the junction...
– Solar Mike
1 hour ago
Could you also answer why they didn't use an extended straight ramp but with a legal grade?
– aitchnyu
1 hour ago
@aitchnyu extended to where? because that would not physically fit, which would result in either the trains crashing into the span or a lip at the intersection.
– ratchet freak
45 mins ago
add a comment |Â
up vote
3
down vote
up vote
3
down vote
source google maps
The distance between the intersection and the rail is 100m, The road would need to rise about 10m to clear the track. This would mean a average grade of 10%. However you also need to account for the vertical curve in the road so the max grade would be quite a bit higher.
The max grade allowed for non-local roads in the US is about 8% (the place in question is in Pakistan). This appears to be a connecting road that replaces a on-grade railway crossing a bit further east.
With this design you also have a lot more span that you can cross under next to the rails for future development.
answered 1 hour ago
ratchet freak
4,273814
source google maps
The distance between the intersection and the rail is 100m, The road would need to rise about 10m to clear the track. This would mean a average grade of 10%. However you also need to account for the vertical curve in the road so the max grade would be quite a bit higher.
The max grade allowed for non-local roads in the US is about 8% (the place in question is in Pakistan). This appears to be a connecting road that replaces a on-grade railway crossing a bit further east.
With this design you also have a lot more span that you can cross under next to the rails for future development.
answered 1 hour ago
ratchet freak
4,273814
edited 45 mins ago
answered 1 hour ago
ratchet freak
4,273814
answered 1 hour ago
ratchet freak
4,273814
answered 1 hour ago
ratchet freak
4,273814
4,273814
And to probably help reduce the speed of approach to the junction...
– Solar Mike
1 hour ago
Could you also answer why they didn't use an extended straight ramp but with a legal grade?
– aitchnyu
1 hour ago
@aitchnyu extended to where? because that would not physically fit, which would result in either the trains crashing into the span or a lip at the intersection.
– ratchet freak
45 mins ago
add a comment |Â
And to probably help reduce the speed of approach to the junction...
– Solar Mike
1 hour ago
Could you also answer why they didn't use an extended straight ramp but with a legal grade?
– aitchnyu
1 hour ago
@aitchnyu extended to where? because that would not physically fit, which would result in either the trains crashing into the span or a lip at the intersection.
– ratchet freak
45 mins ago
And to probably help reduce the speed of approach to the junction...
– Solar Mike
1 hour ago
And to probably help reduce the speed of approach to the junction...
– Solar Mike
1 hour ago
Could you also answer why they didn't use an extended straight ramp but with a legal grade?
– aitchnyu
1 hour ago
Could you also answer why they didn't use an extended straight ramp but with a legal grade?
– aitchnyu
1 hour ago
@aitchnyu extended to where? because that would not physically fit, which would result in either the trains crashing into the span or a lip at the intersection.
– ratchet freak
45 mins ago
@aitchnyu extended to where? because that would not physically fit, which would result in either the trains crashing into the span or a lip at the intersection.
– ratchet freak
45 mins ago
add a comment |Â
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