| Posted by nostra-YOUPPI! |
4/11/2005 12:48 PM | remove |
this is a sector gate, it does double duty on the upper lock (like cote ste catherine) it can be used as a back up gate (like in the lower lock the backup gate is a standard miter gate) but the interesting thing about a sector gate is in case of emergency it can close even if water is flowing. they are huge and expensive and only used for special circumstances
|
 |
| Posted by Emperor Wang |
4/12/2005 2:39 AM | remove |
Do you mean to say that these can be safely closed even if all the downstream gates were open/broken? That would be quite the feat!
|
|
| Posted by nostra-YOUPPI! |
4/12/2005 4:34 AM | remove |
yes, at iroquois they have no valve gear the sector gates act as valves, notice the area that would face upstream is round, that enables these to be opened if there is pressure on them too
|
|
| Posted by nostra-YOUPPI! |
4/12/2005 4:35 AM | remove |
(iroquois the westernmost of the locks on the lake ontario montreal section of the seaway and the only canadian seaway lock west of b'nois
|
|
| Posted by Finder |
4/12/2005 1:02 PM | remove |
Are the gates wood or steel? Steel I hope.
|
|
| Posted by nostra-YOUPPI! |
4/12/2005 2:36 PM | remove |
all steel, see mitre gates (like the other 3 sets in this lock) have a flat face and cant be opened under load, these ones being semi circulat the openeing motion is not fighting the current and thus permits them to open under load
|
|
| Posted by maxt |
11/4/2005 5:14 PM | remove |
I love these gates... they remind me of the ones that protect Rotterdam. Of course, they are a bit bigger. http://www.oks-india.com/user/oksused.asp
|
|
| Posted by Emperor Wang |
12/17/2005 5:57 AM | remove |
Heh. Yeah, those Rotterdam gates are just a tennie bit bigger, maxt.
And my original picture description is out to lunch. There are just two sets of sector gates at Beauharnois. It's the locks at Iroquois that have 4 sets of sector gates. Not all that surprising, considering the entire outflow of Lake Ontario is plugged up there.
|
|
| Posted by nostra-YOUPPI! |
12/17/2005 6:20 PM | remove |
i did some research, the upper b nois and cote st carherine locks have sector gates because there are bridges where the normal mitre gates should be, if they had to use the auxiliary doors they are upstream from the hydraulic intakes, so they needed sector gates, iroquois has sector gates because the maximum lift there is 15 feet, not enough to warrant a whole hydraulic system
|
