Overhead Gantry Crane Site Survey / Site Measure.

Overhead Crane Site Survey. On Arrival at your factory, what to expect and what we need.

When you have ordered an overhead crane one of our engineers will carry out a 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. Site surveys before order will incur a charge, this will be taken off your crane total once ordered.

Our 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.

During 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.

While 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.

The 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.

missing square bar

Below: Crane rails/square bar correctly fitted, prior to site survey.

crane carriages running on square bar


The Factory Floor Depth.

Most 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.

Many 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.

Crane Base Grouting

One 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 this.

free standing crane column

Our site engineer will also go through the power feed requirements you will need to have in place before we arrive to install.

After 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.

Fear not; when installing an overhead crane we DO NOT do this.

men sitting on a crane

Call 01527 894 825 for more info

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All parts of the UK covered for crane sales, installation, testing, repairs, maintenance even; Woking, Hull, Andover, Harpenden, Syston, Hitchin and St Mellons, Cardiff!