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Winches for installing truss in a high roof?
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kevinmcdonough View Drop Down
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    Posted: 24 March 2016 at 4:05pm
hey all

Been asked to look at an install in a very high roofed building, speakers around the outside and a truss up in the roof with some lights.  Basically it'll just stay there permanently, but will need the option of being lowered on occasion for access and maintenance etc.

Our normal lifting procedure for these things would be for the live shows we do so would just be a few lodestars or similar, but wondering if people have any suggestions for a more theatre style set up, with cable winches of some sort?  Could be manual or electric, and could be a fairly contained solution like a loadstar or could have cable tracks along the steel beams that make up the roof to the wall and then down to floor level if needed. 

We have the space and beams to put quite a few low weight points up rather than just having to rely on one or two big ones to carry the whole weight, so a solution along those lines would be great. 

links and ideas?

k


Edited by kevinmcdonough - 24 March 2016 at 4:08pm
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MattStolton View Drop Down
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I have used Hall Stage for curtain track, and motorised and passive curtain systems, and been perfectly happy. They also do scenery and truss winch systems, a la theatre styli'.

Loads of pulleys, metal work and winches and wire rope and shizzle various.

www.hallstage.com
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structural engineer would be my first phone call
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kevinmcdonough View Drop Down
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Originally posted by woody2 woody2 wrote:

structural engineer would be my first phone call


Haha, already done were not putting massive weight up, some triangular truss with a few movers and par cans on, but we already checked weight limits and stuff.

The huge steel beams mean that, obviously centre of gravity and tipping/balance not withstanding, we could easily support the weight of what we're using from a single point.

But we want to spread it over 4 or 6 for redundancy and safety, make sure there is no possibility of accidents.

K
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shagnasty View Drop Down
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This rapidly ends up with Stage Electrics IMHO.

Personally I would use 4x CM prostars, but understand what ever solution you put needs an annual ticket.
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MattStolton View Drop Down
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Originally posted by shagnasty shagnasty wrote:

This rapidly ends up with Stage Electrics IMHO.

Personally I would use 4x CM prostars, but understand what ever solution you put needs an annual ticket.



It moves up and down, so LOLER is all over it, with its ramifications. That is harsh, just have to use common sense for something heavey flown over the publics heads, you wouldn't want it to fail, so you pop it down and check all is cool, regularly enough. Just put it in writing, to document your risk assessment of how often to inspect, when it was inspected, by who, and their competence, and what has been replaced.

An aside, have you ever detected Hygrogen embrittlement, ever?
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James Tengo View Drop Down
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Be more worried about a chain fall... Too soon?
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shagnasty View Drop Down
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Chain fail? on a 128Kg Hoist?? you would be very unlucky, with 4 hoists the rig wouldn't bang in on single point failure anyways, the only issue is I am not sure you can fit dead brake kits to the Prostar...

I would be more concerned about a single point failure on a Theartre style multi-wire single winch rig than on a chain hoist system....

But it all comes back to having to get it ticketed once a year, with Prostar you can rent 4 hoists, swap them out and get your ticketed, if you installed something winch like you have to get it done onsite, which will invariably cost more...
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James Tengo View Drop Down
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Not keeping abreast of current affairs there Sean? http://www.bbc.co.uk/news/uk-scotland-glasgow-west-35903979
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ceharden View Drop Down
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Any reason for not just using manual chain hoists? Simplest solution surely? Or just use two to lift then dead hang. Keep the hoists to lower for maintenance.
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kevinmcdonough View Drop Down
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Originally posted by ceharden ceharden wrote:

Any reason for not just using manual chain hoists? Simplest solution surely? Or just use two to lift then dead hang. Keep the hoists to lower for maintenance.


It's a trampoline park in a huge warehouse, and the truss will be suspended in the middle of the roof, pretty far away from any walls. So not ideal in terms of the manual chains hanging down and getting in the way, and no easy way to store them or get rid of them. Unfortunate, as would be the far cheaper and easier solution. 


k
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shagnasty View Drop Down
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Originally posted by James Tengo James Tengo wrote:

Not keeping abreast of current affairs there Sean? http://www.bbc.co.uk/news/uk-scotland-glasgow-west-35903979

I guess that was the adele gig @ SECC, sorry i misread fall as fail...

Yeah you do need to not how a chin bag works, but with a ProStar you would need extreme skills to screw it up due to the way they are attached top the hoist body....
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