Hello,
What is the procedure/method to drive a battered/rake pile on the water?
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It depends.....
I would be surprised if the design engineer hasn't included how he/she wants the piles staked in the project specification. That would be the first place I looked for answers.
For general knowledge purposes... Construction staking on the water is more of a navigation issue, at least it has been for me. Assuming the contractor is using spud barges for his equipment and supplies, your responsibility would be to navigate the spud barge into the proper position where a specific reference point on the barge will allow the contractor to slide the pile into the water, plumb up the pile, and have it be where it is supposed to be. This technique is easier explained than accomplished. Other techniques could include building a coffer dam and pumping out the water from the construction area. Then standard construction staking techniques would apply. Another, less accurate technique would be to drop buoys and praying the current doesn't shift the buoy out of tolerances.
I hope this helps... Good luck!
@kevin-hines has given you some great answers.
But:
If you don't know what you're doing; you shouldn't be doing it.
you should only be working within your expertise...
@dougie Damn, the first guy launches a roll ahead of the last two and still lands after them.
@dougie Ring Ring from my COO, "We need to meet tomorrow morning to discuss putting together a proposal for a large bridge layout proposal. It includes a lot of terms that I've never heard of including staking grades along the camber". Me, " there's nothing for us to meet about, we are not bidding this project". Him, "what are you talking about?" Me, "if I knew what I was talking about in terms of how to perform the necessary deflection calculations and other flex items, I'd be all over it but I don't dabble in areas where I am not experienced and can do the work with confidence that I've done it right". Him, very long pause..."so you want to pass up on a great opportunity?" Me "yes, I want to pass on an opportunity for disaster!". Never was that opportunity discussed again.
I’ve staked a few bridges and computing the beam deflection wasn’t part of my scope. The deflection at the ten(10) points is design and my license doesn’t allow me to do bridge design. All the plans had a haunch table that makes it so simple that a survey monkey like me could do it. Lol
The only battered piles on which I worked (staked) were for a ship dock just off the shore. The contractor was working from a barge and drove temporary piles to which a frame was mounted and I "aligned" the template to that frame. When the template was aligned the piles were fitted into the slots in the template and driven using a diesel hammer. The "Mooring" Dolphins had one template and the "Breasting" Dolphins had another.
The templates were steel plates (1" thick?) and welded to cross beams welded to steel pipe piles driven in approximate location. The tricky part of the construction was actually driving the piles. It took two 175 ton cranes on barges. One to hold the leads (the hammer and frame) and one to lift and hold the pile. EXTREME coordination between the operators.
After the templates were set my job was to count the blows (per foot) and when "refusal" was reached to mark the needed elevation. Hot, nasty (diesel and oil blowing everywhere) and noisy. I loved it because I was learning something new every day.
Andy
I "aligned" the template to that frame
We you on shore on solid ground somehow “aligning” way far away…?
https://heavyindustry.trimble.com/en/products/machine-control-wire-crane-block-placement.
I’ve become a lazy surveyor. Not fat, just lazy.
Depending on water depth the contractor may build a cofferdam and pump out the water. Stake CL bearing and “L” line on cofferdam sheet piling. Coordinate with contractor regarding what they need/want.
I’m a surveyor who does construction staking, not a construction staking God.
On the rare occasions I've been involved the piles were close inshore (within 50 metres). The rig frame was set to the required rake. We then used two theodolites to intersect two markers on the piling barge to approximately position it and then used two markers on the pile to precise position by intersection. Best done just before low tide so there is minimal movement on the barge at slack water.
(And, you don't want to be driving on a falling tide with raker piles, just in case the tide drops faster than you drive!)
