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18:32 Jun 24, 2011
French to English translations [PRO] Tech/Engineering - Nuclear Eng/Sci
French term or phrase:Chape et contre écrou
This is the whole sentence:
Le contrôle consiste à vérifier que le marquage soit en ligne sur les 3 composants suivants de chaque tirant et notamment la chape, le contre écrou et le tirant
Can anyone help me with the technical term in English (UK) for "chape" and "contre écrou". Thanks!
Explanation: The following will be valid for cables or rods in structural applications, which I take it is where your tirants are. Note however that a tirant can be something else in a different context, without which I cannot guarantee that the following is correct.
A chape in this context is a two-pronged steel attachment, a clevis/fork etc. as diversely detailed below. The two prongs each have a hole drilled through them. The prongs fit over a "lug", also with a hole drilled through it. The lug will be welded or otherwise attached to some structural member. By fitting the fork/clevis/yoke etc. over the "lug" and putting a bolt through the holes, you can fix two structural elements together;
The yoke/clevis etc. can be attached (swaged) to a cable or can be threaded onto a rod, which presumably is the case here. A locknut is threaded onto the rod first, then when the clevis is in the position required, the locknut is tightened against it, thus preventing it moving.
Kiwipedia has: Chape ... knuckle joint, clevis, yoke [Chambers, McGHill], fork and eye, pin joint, 'split' hinge [MitchellS&F2,p.326], yoke [NCEI,4.03,p.14] Chape/oreille Clevis/lug, fork and eye (voir Chape)
-------------------------------------------------- Note added at 49 mins (2011-06-24 19:21:59 GMT) --------------------------------------------------
There's a nice picture of these things here, showing the clevis type fitting threaded onto the end of a bar, with the locking nut tightened against it, and also of the individual components. http://www.flying-wires.ch/flying-wires/img/wires_1.jpg
-------------------------------------------------- Note added at 51 mins (2011-06-24 19:24:36 GMT) --------------------------------------------------
On balance, and now that I've looked further into the text I'm sure you're right. I'm 100% on the locknut at least as it makes sense in further context. I feel I need to do some more research on tensioners though as there seem to be many types and my text is a manual with lots of lists and indexes with little context! Arghghgh. Thanks so much for your help!
I'm not sure how the stud tensioners for nuclear reactor vessels work, i.e. how they grasp the studs, but I imagine they screw onto the threaded end above the nuts, so there is no need (that I can see) for clevises.
On the other hand, you have what is called a "stud tensioner" ("fork/stud tensioner"), or what I would call a turnbuckle here: http://www.petersen-stainless.co.uk/NewFiles/AW.html
which does have a fork/clevis and a locknut.
Whatever they are and whatever they do, "clevis/fork", etc. and "locknut" must be right here.
I suppose they could be "tensioners" .... My reserve was because I couldn't imagine where these things would be in a nuclear context; I was thinking "ground anchors" and "prestressing tendons" but couldn't see how chapes came into it. Decommissioning is different, and the fact that it is a nuclear plant is irrelevant, whatever the things are or are used for.
I don't know if this helps with context at all but I think that the "tirants" in question are tensioners. The text is about the dismantling of a nuclear power plant.
Automatic update in 00:
Answers
45 mins confidence: peer agreement (net): +1
clevis and locknut
Explanation: The following will be valid for cables or rods in structural applications, which I take it is where your tirants are. Note however that a tirant can be something else in a different context, without which I cannot guarantee that the following is correct.
A chape in this context is a two-pronged steel attachment, a clevis/fork etc. as diversely detailed below. The two prongs each have a hole drilled through them. The prongs fit over a "lug", also with a hole drilled through it. The lug will be welded or otherwise attached to some structural member. By fitting the fork/clevis/yoke etc. over the "lug" and putting a bolt through the holes, you can fix two structural elements together;
The yoke/clevis etc. can be attached (swaged) to a cable or can be threaded onto a rod, which presumably is the case here. A locknut is threaded onto the rod first, then when the clevis is in the position required, the locknut is tightened against it, thus preventing it moving.
Kiwipedia has: Chape ... knuckle joint, clevis, yoke [Chambers, McGHill], fork and eye, pin joint, 'split' hinge [MitchellS&F2,p.326], yoke [NCEI,4.03,p.14] Chape/oreille Clevis/lug, fork and eye (voir Chape)
-------------------------------------------------- Note added at 49 mins (2011-06-24 19:21:59 GMT) --------------------------------------------------
There's a nice picture of these things here, showing the clevis type fitting threaded onto the end of a bar, with the locking nut tightened against it, and also of the individual components. http://www.flying-wires.ch/flying-wires/img/wires_1.jpg
-------------------------------------------------- Note added at 51 mins (2011-06-24 19:24:36 GMT) --------------------------------------------------
The translation workplace 
peer agreement (net): +1
