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Passenger Trains > How to keep movable bridges movableDate: 07/05/26 06:47 How to keep movable bridges movable Author: march_hare OK, a simple minded engineering question regarding the closure of movable bridges due to heat expansion:
Why not spray water on the bridges? All of the NJ ones cross navigable water, which is to say water that's deep enough to float a boat. Why not get a bunch of "trash pumps" at Home Depot and spray water on these bridges? I realize that salinity issues would play in there somewhere, but you'd only be spraying for a few days. Criticism welcome. Edited 1 time(s). Last edit at 07/05/26 07:29 by march_hare. Date: 07/05/26 07:19 Re: How to keep movable bridges movable Author: Englewood Good idea but in today's world it would be about as simple as building a working car washer in Chicago.
Date: 07/05/26 07:54 Re: How to keep movable bridges movable Author: MNR225 : Date: 07/05/26 08:50 Re: How to keep movable bridges movable Author: march_hare So it's not such a goofy idea after all. I wonder how much water it takes to be effective.
Next, for my nerdy amusement, does the problem originate mostly from expansion of the rails, or does it involve expansion of the b\ridge itself? Date: 07/05/26 09:24 Re: How to keep movable bridges movable Author: kevink Englewood Wrote:
------------------------------------------------------- > Good idea but in today's world it would be about > as simple as building a working car washer in > Chicago. Amtrak installed water sprinklers on the South Branch Bridge in Chicago several years ago. Seems to have reduced the number of heat-related closures. Posted from iPhone Date: 07/05/26 10:00 Re: How to keep movable bridges movable Author: Lackawanna484 Built in sprayers sound like something NJ Transit rail should be considering for its North Jersey Coast Line bridges.
Ten million dollars worth of consultants later... Posted from Android Date: 07/05/26 10:06 Re: How to keep movable bridges movable Author: jp1822 Lackawanna484 Wrote:
------------------------------------------------------- > Built in sprayers sound like something NJ Transit > rail should be considering for its North Jersey > Coast Line bridges. > > Ten million dollars worth of consultants later... > > Posted from Android It honestly should not be that hard. And it does come up in NJ more than one thinks for both NJT rail lines and the NEC. Even highway draw bridges were subject to gettting dowsed by fire companies to get the bridges back in the "down position" so they could align properly in closing. Date: 07/05/26 10:22 Re: How to keep movable bridges movable Author: PHall Of course if you put in a Bridge Cooling System then you have to maintain it too. Just another item on the underfunded maintenance budget.
Date: 07/05/26 11:36 Re: How to keep movable bridges movable Author: jp1822 PHall Wrote:
------------------------------------------------------- > Of course if you put in a Bridge Cooling System > then you have to maintain it too. Just another > item on the underfunded maintenance budget. You betcha - put a pump in the waterway near the bridge and have some old fashioned sprinklers with simple piping running across the bridge. Problem is - this does have a chance of being realized because it doesn't just affect rail passenger riders like a train car wash does. The bridges being in the "closed position" during the latest heat wave have garnered the attention of wealthy Jersey Shore community boaters with ties to government leadership. People often don't forget things in a day in NJ....... Date: 07/05/26 12:15 Re: How to keep movable bridges movable Author: radar Spraying a steel bridge with salt water seems like it could fuel rust and deterioration something terrible, no matter how brief.
Date: 07/05/26 14:06 Re: How to keep movable bridges movable Author: SCAX3401 kevink Wrote:
------------------------------------------------------- > Amtrak installed water sprinklers on the South > Branch Bridge in Chicago several years ago. Seems > to have reduced the number of heat-related > closures. And they were working back in June 2022 when I went over this bridge twice (Capitol Limited east, Lake Shore Limited west) on what were fairly hot Chicago days.. Date: 07/05/26 15:16 Re: How to keep movable bridges movable Author: PHall jp1822 Wrote:
------------------------------------------------------- > PHall Wrote: > -------------------------------------------------- > ----- > > Of course if you put in a Bridge Cooling System > > then you have to maintain it too. Just another > > item on the underfunded maintenance budget. > > You betcha - put a pump in the waterway near the > bridge and have some old fashioned sprinklers with > simple piping running across the bridge. Problem > is - this does have a chance of being realized > because it doesn't just affect rail passenger > riders like a train car wash does. The bridges > being in the "closed position" during the latest > heat wave have garnered the attention of wealthy > Jersey Shore community boaters with ties to > government leadership. People often don't forget > things in a day in NJ....... And you have to make sure it's drained before the first freeze of the season too. Date: 07/06/26 04:24 Re: How to keep movable bridges movable Author: jp1822 PHall Wrote:
------------------------------------------------------- > jp1822 Wrote: > -------------------------------------------------- > ----- > > PHall Wrote: > > > -------------------------------------------------- > > > ----- > > > Of course if you put in a Bridge Cooling > System > > > then you have to maintain it too. Just > another > > > item on the underfunded maintenance budget. > > > > You betcha - put a pump in the waterway near > the > > bridge and have some old fashioned sprinklers > with > > simple piping running across the bridge. > Problem > > is - this does have a chance of being realized > > because it doesn't just affect rail passenger > > riders like a train car wash does. The bridges > > being in the "closed position" during the > latest > > heat wave have garnered the attention of > wealthy > > Jersey Shore community boaters with ties to > > government leadership. People often don't > forget > > things in a day in NJ....... > > And you have to make sure it's drained before the > first freeze of the season too. You must work for Amtrak - making a simple solution complicated with lots of excuses....... Date: 07/06/26 13:22 Re: How to keep movable bridges movable Author: mapboy Speaking of water on bridges, the US Forest Service in Yosemite has wooden bridges on trails in fire-prone areas with sprinklers fed by water lines from upstream. When there's a fire in the area, someone opens the valve (it could be a remote control solar-powered valve) and gravity does its work. A relatively low maintenance system.
mapboy Date: 07/06/26 17:03 Re: How to keep movable bridges movable Author: phthithu A lot of interesting stuff in this thread. I know the NWP has a glitchy swing bridge at Black Point that has problem with uneven heating as it runs sort of northeast to southwest and in the afternoon that can cause problems with the sun on the northwest facing side.
Date: 07/07/26 07:33 Re: How to keep movable bridges movable Author: longliveSP jp1822 Wrote:
------------------------------------------------------- > PHall Wrote: > -------------------------------------------------- > ----- > > jp1822 Wrote: > > > -------------------------------------------------- > > > ----- > > > PHall Wrote: > > > > > > -------------------------------------------------- > > > > > > ----- > > > > Of course if you put in a Bridge Cooling > > System > > > > then you have to maintain it too. Just > > another > > > > item on the underfunded maintenance budget. > > > > > > You betcha - put a pump in the waterway near > > the > > > bridge and have some old fashioned sprinklers > > with > > > simple piping running across the bridge. > > Problem > > > is - this does have a chance of being > realized > > > because it doesn't just affect rail passenger > > > riders like a train car wash does. The > bridges > > > being in the "closed position" during the > > latest > > > heat wave have garnered the attention of > > wealthy > > > Jersey Shore community boaters with ties to > > > government leadership. People often don't > > forget > > > things in a day in NJ....... > > > > And you have to make sure it's drained before > the > > first freeze of the season too. > > You must work for Amtrak - making a simple > solution complicated with lots of excuses....... Nothing the government is involved with is simple... |