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Post by christopher125 on Oct 31, 2018 21:46:32 GMT
As someone fascinated by unfinished railway infrastructure, this is amazing - a video has been uploaded to youtube showing a LIDAR survey of the Bouverie Street Ventilation Shaft, on the Fleet Line extension east of Charing Cross. Any idea how this was done, and what those things are presumably floating at the bottom? |
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Post by bearbin on Oct 31, 2018 21:55:46 GMT
The floating bits look like they could just be artifacts where the imaging device was located - the same for the flying squares in the vertical tunnel.
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Post by superteacher on Oct 31, 2018 22:16:58 GMT
I’m assuming the tunnel at the bottom was to have been part of the running lines?
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Post by norbitonflyer on Oct 31, 2018 23:09:06 GMT
Where on Bouverie Street does this break the surface?
I thought the Fleet Line tunnels only went as far as Aldwych, but here's one nearly at Ludgate Circus!
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Post by rapidtransitman on Nov 1, 2018 0:55:31 GMT
The floating bits look like they could just be artifacts where the imaging device was located... Hopefully they're not shitbergs. *getting my coat* |
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Post by christopher125 on Nov 1, 2018 2:47:03 GMT
Where on Bouverie Street does this break the surface? I think it's the tower you can see projecting from the top of the grey office block between Temple Lane and Bouverie Street: Google Maps |
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Post by norbitonflyer on Nov 1, 2018 7:55:44 GMT
I've been to that building a few times, and never knew that shaft was there!
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Post by John Tuthill on Nov 1, 2018 10:35:22 GMT
Where on Bouverie Street does this break the surface? I thought the Fleet Line tunnels only went as far as Aldwych, but here's one nearly at Ludgate Circus! Back in the '60s, behind the site of Ludgate Hill station was a bomb site used as a car park. I can remember the time when there was a sign on the Ludgate Hill side stating something to the effect of "Proposed site for new station on the Fleet Line." Check out the "London Connections" web page, there are engineers drawings showing the proposed routings |
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Post by trt on Nov 1, 2018 10:44:50 GMT
I like the ghostly silhouette of the operator sitting at the bottom of the shaft. I'm guessing it was a LIDAR equipped drone being flown there. Presumably the floating squares above the figure are real objects. They look like metal plates of some kind with a large central hole and four "bolt" holes. Perhaps they are part of a cable descent system, spacing 4 nylon ropes apart. If it's a drone operating in a confined space with cables around, they would need to mark a no fly area I suppose. They would have to capture a 3D model of the space and then create the fly-through virtually - it's not like a camera drone. Or it could be the plate on the bottom or top of a LIDAR pod as it is lowered down the shaft in stages, again suspended from the two cables strung across the top of the shaft. They must have floated the pod along the tunnel somehow, maybe on a paddle board which is what we see numerous times at the bottom. LIDAR is light based, so it has to be line of sight, and they capture the back of the tunnel rings. Being light based, it also picks up on surface treatments, like paints, which have different absorption coefficients in the waveband they are imaging over, probably infrared. It's really very high resolution, so I'm guessing it's quite a big unit they used.
Judging by the position of the shaft from Google Maps, that bend into a horizontal tunnel is not for running rails. The running rails would have been under the Strand roadway itself, some 40-50m from the vertical shaft. I think this tunnel would have intersected the running tunnel maybe at right angles. Although there is a step plate in there... it isn't wide enough to be a running tunnel looking at the scale of the body board and the human figure.
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Post by norbitonflyer on Nov 1, 2018 11:07:40 GMT
Where on Bouverie Street does this break the surface? I thought the Fleet Line tunnels only went as far as Aldwych, but here's one nearly at Ludgate Circus! Back in the '60s, behind the site of Ludgate Hill station was a bomb site used as a car park. I can remember the time when there was a sign on the Ludgate Hill side stating something to the effect of "Proposed site for new station on the Fleet Line." Check out the "London Connections" web page, there are engineers drawings showing the proposed routings I knew of the plans, but not that any actual shovels-in-the-ground work had been done that far east. Even as late as 1981 the Ludgate Hill bomb site was, as far as I could see, more or less as the Luftwaffe had left it. |
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Post by nickf on Nov 1, 2018 11:56:16 GMT
I love the shark fin swimming in the opposite direction at 1:34
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Post by trt on Nov 1, 2018 12:58:17 GMT
Sharks with frikin' LIDARs on their heads?
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Post by rapidtransitman on Nov 1, 2018 15:03:00 GMT
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Post by norbitonflyer on Nov 1, 2018 15:30:28 GMT
Judging by the position of the shaft from Google Maps, that bend into a horizontal tunnel is not for running rails. The running rails would have been under the Strand roadway itself, some 40-50m from the vertical shaft.. This is east of Aldwych, where the diagram shows the line to be running parallel to, but about 100 yards to the south of, Fleet Street. (It passes just to the south of St Brides Church). The extract does not extend as far as Bouverie Street but it looks like the running tunnels are indeed in line with the north end of Temple Lane, where the shaft is. |
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Post by trt on Nov 1, 2018 16:27:52 GMT
Judging by the position of the shaft from Google Maps, that bend into a horizontal tunnel is not for running rails. The running rails would have been under the Strand roadway itself, some 40-50m from the vertical shaft.. This is east of Aldwych, where the diagram shows the line to be running parallel to, but about 100 yards to the south of, Fleet Street. (It passes just to the south of St Brides Church). The extract does not extend as far as Bouverie Street but it looks like the running tunnels are indeed in line with the north end of Temple Lane, where the shaft is. I see that now, yes. Pity that bit of the plan is missing from the London Reconnections website. But why does it curve in so gradually then, in line with what people are presuming to be a running tunnel? Surely that gentle bend would have to come out if the shaft were to intersect the roof of the running tunnel? Unless it was intended to drop in between the two running tunnels and the wider part was just intended as ventilation. Possibly forming part of the station complex under St. Brides/Bridge St. |
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Post by djlynch on Nov 13, 2018 22:27:48 GMT
Judging by the position of the shaft from Google Maps, that bend into a horizontal tunnel is not for running rails. The running rails would have been under the Strand roadway itself, some 40-50m from the vertical shaft.. This is east of Aldwych, where the diagram shows the line to be running parallel to, but about 100 yards to the south of, Fleet Street. (It passes just to the south of St Brides Church). The extract does not extend as far as Bouverie Street but it looks like the running tunnels are indeed in line with the north end of Temple Lane, where the shaft is. The TfL Property Asset Register shows that the route of the running tunnels would have been just north of the northern end of Temple Lane, with some kind of cross-passage planned to connect to the shaft. |
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Post by edgemaster on Dec 7, 2018 0:17:08 GMT
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