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 crane. Site surveys before order, will incur a charge, please discuss this with one of our sales team.
Our engineer will take all the usual factory dimensions and the area the crane needs to cover. This includes the building span, the eave height at its lowest and highest point, as well as the roof height in the centre, 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.
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 over come the problem by suggesting moving the crane legs. This picks up the problem before any thing is manufactured, which can incur costs.
Our site engineer will also go through the power feed requirements you will need to have in place before we arrive to install.
Free Issue Crane Rails
If you are providing and erecting free issue crane rails, we require the following on our site survey.
1. That 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. Square bar or gantry running rails, has been fitted on top of the main universal beams, for the crane to run on. 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).
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.
The Factory Floor Depth.
Most factory floors are fine to stand a free standing crane on for capacities of 1t, 2t, 3.2t 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.
Many of our clients give these column loadings to their landlord. If the landlord cannot or will not approve 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.
After the site visit we will issue a drawing to you to approve before manufacturing can begin. Our quoted lead time will be from payment of the deposit and signed drawings.
Fear not; when installing an overhead crane we DO NOT do this.