richard Posted July 6, 2007 Share Posted July 6, 2007 Hello chaps I am trying to work out a way of getting some cables (lighting, sound video) across a very busy road in central london. We can get a short closure to lay ramp across, and we have a full closure for the event but I don't know what there is available that is suitable for laying over a public highway (the stuff Stage Electrics do is meant only for site work) Has anyone had to do this before and if so how have they managed it? Thanks Richard Link to comment Share on other sites More sharing options...
David Lee Posted July 6, 2007 Share Posted July 6, 2007 We used to have to supply electrics for tour buses in a parking bay over the road from the venue I worked at. Used cantenary wire - obviously higher than double deckers etc. Surely the highways dept. or council should be able to advise you on what they would expect? Link to comment Share on other sites More sharing options...
Big Dave Posted July 6, 2007 Share Posted July 6, 2007 Second for the cantenary wire. Thats what we've had to do every time in london when there has not been a structure in place. Not knowing where you are working, but in areas like the Mall and Hyde park there are some channels already in place under the road surface that can be used. Link to comment Share on other sites More sharing options...
Dave Posted July 6, 2007 Share Posted July 6, 2007 It may be possible (with permission) to use lamposts (or scaff poles fixed to them) to support catenary wires. Failing that you'll have to attach them to adjacent buildings, possibly even drilling holes for eyebolts! But remember that the weight of cables can be considerable and a catenary wire transfers most of this force to the horizontal direction, pulling the supports inwards! I'm sure I've also seen trussing (both the aluminium theatre sort and the steel scaffolders type) used to carry cables over roads on OBs. Link to comment Share on other sites More sharing options...
Bix Posted July 6, 2007 Share Posted July 6, 2007 Depending on your budget, truss bridges can be very handy. Moreso with bigger cable bulk ie: 400A tails. Link to comment Share on other sites More sharing options...
Jivemaster Posted July 6, 2007 Share Posted July 6, 2007 If it's a place that has Christmas Lights then there may be fittings in place. However you will need the permission of the leasholder and probably freeholders too and specific insurance. Link to comment Share on other sites More sharing options...
richard Posted July 6, 2007 Author Share Posted July 6, 2007 Sadly I don't think the historic buildings would like us bolting in to them around there. The truss bridge is definatly an option, especially for the OB route, it would just be nice if at least our screen cables could be ramped in some way but I don't know that that is possible. Thanks for the help so far! Richard Link to comment Share on other sites More sharing options...
Jambo_UK Posted July 6, 2007 Share Posted July 6, 2007 Could try this but it depends on the traffic on that road. http://www.cableprotector.co.uk/externalcableprotectors.asp 6000kg max weight. Can sure how much a bus weights per axle. Going to see if I can find a more Heavy Duty, Heavy Duty System. More details about the event could help. Like width of road. How busy the road is etc. But anyway hope this helps Regards Jamie Link to comment Share on other sites More sharing options...
ceecrb1 Posted July 7, 2007 Share Posted July 7, 2007 yeah we got a large stack of those at work.. theyre great! fast and a lot stronger than they look..... we had FULL bin lorries trundling over them last weekend at full speed.... moved a tiny bit in 3 days but nothing you wouldnt expect really fast to rig.. just a little repettative if you forget one cable and have to re-open (or in our case.. wifi DMX not working so need to lay DMX cable....) Link to comment Share on other sites More sharing options...
Rob_Beech Posted July 8, 2007 Share Posted July 8, 2007 Average coach has a between 10 and 12 tonne unladen weight, get 50 people on and their luggage and this will increase a little, the rear axle would carry a higher proportion of the weight. More than 6000kg on the rear axle of a full coach. More still on a 40ft truck, though the weight would be distributed over more axles. Link to comment Share on other sites More sharing options...
Jivemaster Posted July 8, 2007 Share Posted July 8, 2007 Can you find a tree each side to support a catenary? Link to comment Share on other sites More sharing options...
leofric Posted July 10, 2007 Share Posted July 10, 2007 Whilst the cable protector type product is very good and very strong I have seen it split apart at the joins when there have been high volumes of traffic over it. It seems to depend on the approach speed of the vehicles crossing it and the adhesion the ramp has to the surface it is laid on. grass= good gravel = bad. The truss bridge might be the way to go Link to comment Share on other sites More sharing options...
estra Posted July 10, 2007 Share Posted July 10, 2007 If you do want to go with the cable protector, this one says that it can support up to 41,300lb (approx. 18,700kg) Link to comment Share on other sites More sharing options...
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