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Greenheart pile removal


Johnsond
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Hi All 

ive a colleague whom has been asked to remove a number of greenheart piles from an old jetty. Basically they will be cleared to 1m below bed level then cut. Old school way was with a diver with an air powered saws as per pic but health and safety nowadays tends to not like such bits of kit. My query is are there shears out there that could deal with 14 inch square greenheart ?? And if so could they be crane deployed on a rigging bridle to be positioned on the pile ?? 

Just throwing this out there guys for some opinions 

Cheers 

bb071d58-d364-4a0f-9532-b85e3285812c.jpg

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1 hour ago, difflock said:

Is it not possible to pull them out, if a crane is to be involved anyway, thinking something involving vibration if a straight pull will not work, since are they not seriously valuable timbers?, especially the sound stuff from below the waterline.

marcus

Hi 

Yeah the first option will be to choke them and go for a straight pull. Can't use the vibro extraction option as the timber is in poor condition above water. This in my experience is generally the case as the constant exposure to air and then water is far more damaging than constant immersion. If they don't pull then client will want a contingency plan.  All the cutting and or shearing would be a subsea operation at 1m below bed level, total water depth is approx 12m involving divers so dust etc would not be an issue although I will pass the warning on as they will no doubt be dealing with them once on surface. Regarding the shears the main concern is as to wether they would have enough grunt to deal with piles of that size. 

Cheers 

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Tightly Strap, or clamp, a vibrating poker, or two(i.e. normally used for concrete) to the subsurface portion, just above the bottom?

And if 12 m of water depth( depending on the tidal range) keep the vibration deeper than the slinging point.

Kinda presumably in mud silt otherwise piles should not be needed, hence my thoughts as to how to "seaugh" them outta the mud, and thinking a slow steady pull over time with vibration.

I know absolutely nothing about the subject, I am simply thinking out loud.

And actually the time element may be more important than the pulling force, purely based on my experience of extracting posts from mud using my manual(but limited) brute force. 

Slow and steady wins out over fast and brutal.

Edit: Bound to be water-proof hydraulic powered vibration rigs out there for setting sheet steel piling?

Or thinking a standard petrol or diesel  powered vibrating plate re-powered with a suitable hydraulic motor?

Actually actually double drum vibrating rollers already got hydraulic powered eccentrics to provide the vibratory force, judging by the location of various hydraulic pipes?

Marcus

Edited by difflock
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They will need to be vibrated out clamp top vib and pull it’s a time consuming and expensive job, I don’t think a shear will have anywhere near the power or operator control required ,your barge will be moving we tried to shear some that we pulled out of the Thames and failed 

if not diver and saw will not be slow, suck out round the pile so they can kneel or stand,then cut.they made us wear chainsaw trousers last time till we proved they gave no cut protection from the saw

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7 hours ago, Johnsond said:

Hi All 

ive a colleague whom has been asked to remove a number of greenheart piles from an old jetty. Basically they will be cleared to 1m below bed level then cut. Old school way was with a diver with an air powered saws as per pic but health and safety nowadays tends to not like such bits of kit. My query is are there shears out there that could deal with 14 inch square greenheart ?? And if so could they be crane deployed on a rigging bridle to be positioned on the pile ?? 

Just throwing this out there guys for some opinions 

Cheers 

bb071d58-d364-4a0f-9532-b85e3285812c.jpg

Without really knowing isn’t this a job for a firm who specialise in underwater work?  There must be divers who specialise in all sorts of underwater challenges.  Surely a competent diver trained to use the air saw is the simplest way? And if need be airbags can help bring the piling to the surface so in some ways much safer than normal tree felling.

 

I have a feeling the value of the beams will be far outweighed by the cost of the job.  Just as it is with trees above ground usually.

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1 hour ago, Squaredy said:

Without really knowing isn’t this a job for a firm who specialise in underwater work?  There must be divers who specialise in all sorts of underwater challenges.  Surely a competent diver trained to use the air saw is the simplest way? And if need be airbags can help bring the piling to the surface so in some ways much safer than normal tree felling.

 

I have a feeling the value of the beams will be far outweighed by the cost of the job.  Just as it is with trees above ground usually.

Hi yeah absolutely 

the guy who is asking has nearly 30 yrs commercial diving experience and prior to that was a navy clearance diver. He now runs  his own inshore commercial diving firm. Normal practice/old school would be to airlift around the base of the pile and then cut with a diver operated hydraulic or air powered saw as per pic. But the health and safety types are not keen on that nowadays. I've done this operation myself as a diver and dive supv and it's a hard one to risk assess and train for. It was myself whom suggested the idea of shears as hydraulics will happily work sub sea.The problem with vibroing  out timber piles is the tops are nearly always rotten or weaker than the portion of pile remaining in the ground and invariably tears apart. Also the vibro hammers are designed to clamp onto steel piles not the top of old timber piles. The job itself is for demolition of an old navy jetty so the value of the timber is not a concern as it will most likely be scrapped at end of job. 

I was just throwing it out there hoping that somebody might have a way of or experience of adapting the newer bigger shears to carry out the task. 

Cheers 

 

 

Edited by Johnsond
Grammatical error
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