Tidal Work?

aom

aom

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I probably pretty much already know the answer to this one but we have around 150m of scaffold to price for a sea wall which is only around 4m high so not a great weight behind it. The problems begin as it has to be founded from the sea bed which is pretty solid and there is heavy plant and machinery in there at the moment. The rise and fall of the tide could be as much as 3m and the MC only concern is we screw the boards down even though we are not allowed to tie the job into the sea wall. It is in a sheltered harbour but even at that storms do affect wave height, I'm not sure even a design could account for these conditions and think a risk assessed route could be just as effective?
 
Try filling ton sacks with wet cement and setting a couple of 4ft tube into them,these can then be used as anchor weights to tie into,obviously you'd need your designer to calculate how many would be needed,you can just crane them out when finished.
 
That sounds quite a dandy idea BF, thanks. I was going to give the designers a by on this one as the job is still basic although the tie points might be creative.;)
 
bigfish said:
Try filling ton sacks with wet cement and setting a couple of 4ft tube into them,these can then be used as anchor weights to tie into,obviously you'd need your designer to calculate how many would be needed,you can just crane them out when finished.
Click to expand...

Dont forget the environment man! Cement is bad stuff maybe build them on land good idea Bigfish
 
Yea steve,you build them in the yard,you can then get them reasonably straight,you can then link them together with a crude ledger if needed,you can also use them again as counterweights if need be:idea:
 
Fook the environment the sea bed round here is awash with concrete anchors for boats and salmon debris from the farms. The local contractor has been reinforcing the sea wall so he is bound to have something suitable, and yes Hatterscaff, the holiday was magic thanks.
 
If you secure the boards to the scaffold, the whole scaffold will go. Would be better to fix open grating like steel "Kennedy Grating" or glassfibre grating with 25mm square openings these tend to be used in Marina's. Both will allow the water to wash through with minimal resistance.

Neil
 
You are probably quite right Neil but a bit overly complicated for the country boy's. I was more thinking fix the boards down as we normally do anyway and tell them to monitor environmental conditions and whip them off if any high winds are predicted.
 
cheese grater decks for system.
also why dont you just do a cantilever drop and disregard the sea bed.
 
Asked about that but there is a wide pedestrian access getting formed tight to the sea wall at the same time, the scaffold is just going up to fit the hand rails.
 
dont know if cuplock have similar boards to layher (cheese graters) but they were handy cause you can install board retainers to them and they have the holes which allows the rising water to pass threw them strapping boards was pointless on the 1 we done all it did was lift up with the tide even thow it was jacked to the underneith of the peir and collect that much sh1te on them every tide was about 2ft of sludge on the boards (how do you calculate for that) and it took some beating ended up with around £50.000 of damaged materials but the lather held up the best had to go swimming to strip the last 20ft out ad the tide wasnt low enought for another 3 mounths lol
 
aom

Just be careful, the job may seem insignificant, but if the scaffold keeps being affected by the tidal conditions the Main Contractor will be dragging you back and forth stating you're the expert etc etc. Can you tell them you will install the frame and it is their resposibility to install and remove the boards. You will hire the boards to them.

Neil
 
Ok from a scaffold design viewpoint.

If we know the loads we can design for them.

In this case we don't and as far as I know they are not calculable....as others have said "how do you design for that". You have vertical loads up and down on the platforms as well as horizontal loads.

What needs to happen is the client needs to understand that there are risks (financial and otherwise) to specifying a scaffold in that location. Yes, there are things you can do to reduce damage but there is no way you can eliminate the risk of a total loss of the scaffold in extreme conditions.

We designed a suspended scaffold over the pier at St. Ives, Cornwall, this was the general agreement, taking all reasonable steps to reduce load and therefore damage to the scaffold wherever is reasonably possible.

As Neilb above says - you don't want your client finger pointing at you saying its your problem!
 
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Why dont you not just board the kicker lift with say a triple height toeboard and chuck half the beach into it that should weigh the fecker down :laugh:
 
Leave the boards on and it will look like a train hit it.
How will the MC manage their RAMS if they remove and replace the boards?
 
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