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pedestrian operated tower cranes - over sailing issues
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Posted By apjw
the company i am now working for intends to use a pedestrian operated tower crane on one of our sites due to the very nature of the site, 4 storey development, limited lay down areas on site. we also have over sailing issues either side of the new development, these are 4 storey apartment blocks.
here lies the problem - if we leave the crane jib fully extended we will over sail the neighboring properties, this could be managed at site level during working hours by ensuring all loads are contained within the site boundary, however when left to free slew over night the jib of the crane will oversail he neighbouring properties. i have suggested that we fold back the cranes 3 sectional jib to limit or possibly prevent the over sailing issue, the crane supplier and crane manufacturer are not keen on this proposal and have quite cleraly stated that if we do this and the crane is damaged or collapses all the responsibility will lie with our company.
is there anyone out there who can clarify the oversailing issue because the crane hire company are of the opinion that as long as no load is passed over the neighbouring properties there is not an issue. i tend to think that this is not so.
many thaks in advance.
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Posted By Martin Daly
The problem here is one of wind resistance as when unattended the crane must slew with the wind. With the least wind resistance possible.
If you fold up the gib you increase wind resistance there fore increasing the possibility
of the crane falling.
Saying that it would not be by much. And only make a difference in really bad weather.
Martin Daly
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Posted By alex mccreadie
APJW
Because I work for a company who supply POTC's I would suggest you are using the wrong company as a supplier.
There are many cranes on the market that should be able to comply with your needs.
Their statement of we can fold it but if it collapses then it is your fault does not give out a positive message to a customer.
PS I hope it is not one of our salesmen
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Posted By Arran Linton - Smith
Usually crane over sailing issues are either dealt with the provision of a lifting jib or compensation to the property owner.
I have known cases where the property owner has been compensated £4000 a jib swinging over the corner of their garden!
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Rank: Guest
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Posted By Arran Linton - Smith
Usually crane over sailing issues are either dealt with the provision of a lifting jib or compensation to the property owner.
I have known cases where the property owner has been compensated £4000 a jib swinging over the corner of their garden!
Usually compensation is a balance between the additional cost of a fixed and lifting jib.
If the crane has already been installed, then this cost is likely to be much greater!
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Posted By David1965
APJW
If this is the same contractor that i think your refering to I would agree with the last post, go with a company that will give the OK and the correct taining to fold the crane.
PS
Can you text me your new number i have lost it
regard
Dave
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Posted By al wood
the issue with the crane supplier has now been resolved.
the company is going to use a crane hire company whom are quite happy for us to fold the jib when necessary.
with regards to over sailing issues this really does seem to be a "grey" area with conflicting advice.
some say that as long as a load is not passed over neighbouring properties (and the trolley is classed as a load i believe) then there are no oversailing issues.
then again i have been informed that if the jib passess over the neighbouring properties then there is an oversailing issue.
is there a craneage expert out there who can clarify this issue for me and give me some referance to quote to put closure on this matter.
i have won the battle with the selection of crane just need to get the oversailing issue out the way to put some closure on this issue.
thanks in advance
al
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Posted By Arran Linton - Smith
Have a look at this article on http://www.cnplus.co.uk/...ccess_up_in_the_air.html
Over sailing can be very costly indeed and could very easily delay the start of a project. Arguably this is a party wall issue which should be sorted before any construction commences.
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Posted By alex mccreadie
Al
Arran's item is informative and his statement of when over sailing should be discussed completely correct.
Sadly as already mentioned seems always to be left to the contractor to sort.
I cannot within LOLER or BS7121 Parts 1 & 5 find anything to say that a jib can over sail if no load attached.(Not to say it isn't there)
As usual you are left with the problem that if the Jib does over sail will the property owner accept that.
Again I have seen some that will and some that will not.
Sorry I cannot help you further.
Regards Alex
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Posted By Robert K Lewis
Over -sailing issues have to be dealt with in much the same way as party wall issues. You simply cannot over-sail another person's land without prior consent. Having said that the risk of simple jib collapse is relatively small and would normally be dealt with under the insurances.
The use of Luffing jibs will remove the over-sailing problems but tower collapse is still a small risk. In real terms such collapses are relatively rare compared to the volume of use these tower cranes have throughout the UK. Any restrictions of jib movement are though, as stated above, likely to cause more harm than benefit.
Bob
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Posted By Ste McKenzie
Hi All,
The situation i believe is that you need permission from the council to sail over their roads and permission from property 'owners' to sail over their properties. If you have all these permissions in writing then you are clear to start works.
Hope this helps!
ste
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Posted By GeoffB4
An informative thread, thanks guys.
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Rank: New forum user
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There has been more on this recently with the case in Northern Ireland.
Some of the time a simple chat with the neighbours can sort out a lot of issues.
Interestingly in New York there's a rule that if your crane oversails a building you must vacate the top three floors of that building for the duration of the project.
http://www.mantiscranes....n-operated-tower-cranes/
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