Crane Site Survey. On Arrival at your factory, what to expect and what we need.
you have ordered an overhead crane one of our engineers, either Tristan, "Clever Steve," or Alan can do a free site visit. While on site
we will try to establish a number of things and answer any
questions you may have, as well as measuring up for your new or used overhead
cranes arrival on site.
engineer will take all the usual factory dimensions and the
area the crane needs to cover; like building span, the eave
height at its lowest and highest point, as well as the roof
height in the center to obtain the angle of the roof in degrees.
We also record the workshop down-shop length, and the distance
between the building upright supports.
the crane site survey we will conduct a "walk through"
with you to identify any potential hazards that might be in
the cranes way; for example office doors, fire doors, heaters
and floor joints etc.
on site we will try to establish where each free standing
crane supporting column will go, often with a hand sketch.
Aesthetically we usually try to line crane columns up with
the existing building uprights. In an example in Abingdon,
Oxfordshire, recently all four of the crane's supporting columns
in 6 meter pitches sat nicely in front of the building's uprights.
However upon closer inspection "Clever Steve" noticed
the last building portal upright had a join in the floors
concrete, spanning the building.
It is not good practice to put a crane column over a floor
joint or expansion joint in the concrete, or within 200mm
of it. Doing so could cause a crack in the concrete's join
and undermine the stability of the crane's supporting column,
potentially weakening the cranes structure, and almost certainly
damaging the floor. We overcame the problem by suggesting
we move the last set of crane legs back 400mm and adding a
400mm cantilever to the down shop rail.
last thing any tenant wants is a large invoice from his landlord
for damage to the workshop floor or walls. The guy from Abingdon
had 2 other "crane companies" along to
quote the job. Neither of whom had noticed the join in the
concrete. When he mentioned it to them they both said "no
you don't want to worry about that guv..." We won
the order because even if the competition had been cheaper
the repairs to the floor would have far outweighed any saving
on the crane.
|Free issue crane rails or supporting crane steelwork.
If you are providing and erecting free issue crane rails, please can you ensure 4 things before we arrive for your free site survey.... PLEASE!!!
1. The gantry rail has actually been erected before we attend site.
2. End stops have been fitted to the gantry tracks, high enough for the crane end carriages. We cannot issue a test certificate without these.
3. Your steel provider has remembered to fit on top of the main universal beams the square bar or gantry running rails, for the crane to run on. These are usually 50x50mm, 40x40mm or sometimes 50x30mm. Our measurements will be taken from here. The crane we supply has H shape wheels on it and they run electrically down the length of your workshop on the rails (square bar).
3A. See the red universal beam below, that is missing its rail/bar. The client thought the steel price was cheap, but only got half of what he needed and ended up paying far more in the end for an aborted installation, plant hire and crane storage. The yellow rail below is correct.
4. The square bar must be in line across its span; all the way down the length factory, to British Standard tolerances. This must be welded on top of the universal beams to within + or - 3 mm to BS tolerance. When this is fitted prior to our arrival on site we can measure the steelwork span (or rail centres) to make your crane fit to. Failure to do so will result in a second extra chargeable site visit.
We are happy to quote to provide new or used crane rails and tracks, please ask for a quotation. It almost always saves money in the long run; as incorrectly fitted rails will result in; worn crane wheels, void warranty and extra costs.
Below: Crane rails/square bar correctly fitted, prior to site survey.
Factory Floor Depth.
factory floors are fine to stand a free standing crane on
for capacities of 1t, 2, 3.2 and often even 5 tonnes. However,
we will always ask about your floor depth and quality of concrete,
beware of companies who don't. No one can guarantee someone
else's floor or factory structure. For piece of mind however
we can provide you with a set of column loadings; giving height,
span, end carriage length, maximum vertical load, maximum
horizontal load and most importantly the over turning moment
imposed by the crane you require. Click
here for an example.
of our clients give these column loadings to their landlord
to approve which puts the onus on him or her, and not you!
If the landlord cannot or will not do this or, if you own
the building, you may need to consult a local civil and structural
engineering company. A full floor survey will take core samples
during test bores and take 150mm to 200mm deep sections out
in 3 or 4 places. More importantly they will examine what
is below the concrete. The civil engineers will also refill
the holes; just in case you have a high water table.
thing to consider is the finish around the cranes bases. More
often than not we do not stand the base straight on the floor.
Most floors are not level so we use packers and laser it in
all directions and then tighten the bolts down. If you require
the grouting to be done the finish will look like this (see
below). More details on base grouting can be found by
clicking on this link. Again we are happy to advise on
site engineer will also go through the power feed requirements
you will need to have in place before we arrive to install.
the site visit we will issue a CAD drawing to you in 3 axis'
for you to approve before manufacturing can begin. Once the
deposit is paid and the drawing is signed the "delivery
time clock" starts ticking.