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FAQ

Galvanising

Hot dip galvanising is carried out in baths of almost pure zinc, but, as in steels, some other elements are added (like aluminium, lead, nickel, copper, tin, bismuth, etc.) that modify certain physico-chemical characteristics. Numerous academic studies and the experience of a galvaniser lead to the use of different mixtures to achieve greater coating brightness, greater smoothness of the molten zinc, greater ‘indifference’ to the silicon content in the steel.

Hot-dip galvanising has no differentiation in colour: its tone varies from bright bluish-grey to dark matte grey depending on the base material, the bath composition and the thickness of the coating. The ‘coloured’ galvanising mentioned above are electrochemical galvanic deposition treatments, and the different colours in this case are caused by the electrolytic solution used and working process.

The UNI EN ISO 1461 standard and the CEI 7-6 standard of 1997 are currently in force. The first one is concerned with galvanisation in general, while the CEI standard concerns specifications for products destined for the electrical energy sector.
UNI EN ISO 1461 standard (30/09/1999): hot dip galvanising coatings on ferrous final products and steel items. Specifications and test methods;
Standard CEI 7-6 (1997): the standards regulates hot dip galvanising on elements of ferrous material destined for electrical lines and installations.
This means that the IEC standard is still applicable in its own field (defined in the standard), whereas for general galvanising, if there are no other specific standards, the specifications of EN ISO 1461 must be followed. Please note that the EN standards are valid in the member states of the European Committee for Standardisation (CEN), which are obliged to implement the European standards.
This is an important data point to consider during the design stage. However, it is difficult to give precise values: it is possible to use the thickness of the coating required, and then use the relationship between coating thickness and weight per square metre of surface area of the item; in case of hollow items (e.g. pipes), the entire internal surface area must also be considered. Without providing the necessary drainage holes in hollow items, there could be zinc deposits that would significantly increase the weight of the items. Generally, the weight increase is between 3.5% and 10.0%, depending on steel characteristics and the shape and size of the parts to be hot-dip galvanised.
Hot dip galvanising is carried out by immersion in melted zinc; this triggers diffusive processes, whereby the zinc penetrates the steel and forms an alloy with a high adhesion capacity, while the additional zinc creates a pure cathodic protection layer. Coating thicknesses can vary from a few tens of microns to 150-200 microns.
In the electrolithic process, items are immersed in aqueous solutions of zinc salts.
“By injecting” a suitable electric current into the bath, zinc atoms (ions) are attracted to the metal on which they stick, forming a surface layer. This method does not involve diffusion, so there is no alloy between the steel and the zinc: the protective layer of pure zinc adheres to the item by ‘clinging’ in the roughness of the steel and its thickness does not exceed a few microns.
This phenomenon, known in the industry as ‘white rust’, is covered by the reference standard.
It is an oxidation process that mainly affects newly galvanised surfaces subjected to a particularly humid atmosphere; under these conditions, mainly zinc hydroxide and a minimum parts of zinc oxide and zinc carbonate are formed, not affecting the zinc coating’s natural resistance to corrosion.
The surface coating given by the synergetic combination of zinc and paint, called ‘duplex’, produces greater protection than the sum of protection that each of the two methods would offer individually; moreover, the painting of galvanised surfaces can be indicated where a particular aesthetic effect is desired, or to give greater visibility to products.
The so-called cold galvanising is not galvanising in its strict meaning, but is simply a painting method using zinc-based products. No metallurgical reaction takes place between zinc and iron, and only a surface layer is created that is thick enough to provide minimal corrosion protection, which is not even comparable to what can be achieved through hot-dip galvanising.

Structure

The mobile tunnel’s supporting structure is made of hot-dip galvanised steel, calculated in accordance with current steel construction regulations in relation to the installation area, complete with certification signed by a qualified technician.

The cover is anchored on the ground using sliding rails of adequate size, which can be, depending on the circumstances, either dowelled into the ground (with a 250 mm thick concrete floor) or sunk into the concrete pour on a curb or directly at street level.

The tarpaulin has a coupling system between the fabric and the structure characterised by plates thermally welded with frequency machines, complete with straps in tear-resistant material. At the most stressed points, the fastening is carried out by means of thermo-welded bands equipped with steel rings for the entire width of the truss. This system allows us to safely assemble our structures even in highly windy areas.

The contact points are reinforced with a double layer of tarpaulin to prevent the mantle from wearing out.

The structure’s sliding is guaranteed by solid steel wheels with self-lubricating anti-water and dust-proof double ball bearings so that the tunnel can be moved at any time. The wheels are also covered by special accident-prevention guards that guarantee absolute safety for operators and goods.

Copritutto mobile tunnels can be used as:
-Warehouses of any size suitable for regaining unused spaces
-Goods loading and unloading areas
-Machinery and equipment shelters
-Sports centres
-Connecting areas between warehouses or handling areas for incoming and outgoing goods
-Shipyards
-Chemical industries and refineries
-Food industry and large-scale distribution

PVC

The nature of the material itself and the technical/chemical characteristics of PVC ensure its TOTAL impermeability to water and weathering.

PVC, by nature of its components, provides excellent resistance to fabric bending.

PVC has a fire rating of 2, thanks to the special layers it is made of.

Cloth

For greater safety, we have developed a series of technical measures that guarantee the resistance of our covers to the weather and external environmental factors.
The sheets undergo a special coating treatment that guarantees their resistance to UV rays, making them longer lasting and more colour stable.
The roof cover’s fastening to the metallic structure has been designed to provide maximum wind resistance. For this purpose, a double safety system has been installed, made up of traditional thermo-welded plates with reinforced and plastic-coated PVC straps, as well as continuous bands with steel rings welded across the entire width of the roof to guarantee resistance over the entire truss arch.
At the most dynamic points of the covering, sharp corners, vertexes, anchoring points, double-layer PVC reinforcements are provided to prevent tearing caused by the continuous action of atmospheric factors.
The fabric is tensioned by means of tie-rods made from a steel profile (FE 430) with a circular cross-section of adequate diameter, making the mobile structure as rigid as the best fixed structures, but avoiding the bureaucracy of building permits, and also offering handling possibilities in an extremely short time A tensioning hook is also fixed directly above the casing wheel, pushing the fabric downwards, so that even the most persistent wind gusts cannot affect the roof covering.
The steel girders, made up of single trusses or joined in pairs, and the vertical uprights, are joined to the next and previous ones by means of pantographs with a safety system that guarantees the possibility of moving the structure without changing its statics and safety of use.
To complete the structure, a fabric facade with a tear-proof tensioning system is provided at the front of the head trusses. In this case, the facade becomes an integral part of the structure’s cladding and guarantees its tightness right from the ends, preventing rainwater or wind infiltration. The fronts can also be closed using sliding curtains with steel reinforcement or with various systems such as quick-rise doors, strip closures, industrial doors and combinations of these depending on your requirements
The tarpaulin is made of polyester fabric coated with PVC on the surface, on both sides, and reinforced at points where there is increased wearing; it is available in a wide range of colours, which can be combined with each other:
– Fabric weight: 750 gr/sq.m;
– Assembled fabric weight: 900 gr/sq.m.;
– Fire resistance: Self-extinguishing CLASS II certified;
– Warp and weft tensile strength: 400 N/5 cm;
– Tear resistance: approx. 40 Kg;
– Temperature resistance: + 70° C – 30° C.
The front curtains that are installed as standard for closing the COPRITUTTO® are the simplest and most economical way to close your mobile covering. We use PVC tarpaulin BEST ADR CL II with double-sheet reinforcements and vertical pockets with variable spacing and anti-wind steel bars, all depending on the wind thrust in the installation area. To ensure greater wind resistance, the bars are joined together by means of a chain attached to the ends of the structure with a central tensioner that joins the two ends. Once tightened, it provides high strength and flexibility of use.
The central tensioner is manufactured exclusively by us and guarantees an ease of use together with external factors resistance. It cannot be found in similar structures.
For simplicity of use, we have also designed a closure with two “counter-hooks”, one placed at head height and the other at about 2 metres from the ground, which make the opening and closing of the frontal awnings an absolutely comfortable operation.

Coprikompatt S.r.l Coperture Mobili

Registered office
Via Bolzano, 2
66020 San Giovanni Teatino (CH)

Operational Headquarters
Via delle Gualchiere, 2
65013 Città S. Angelo (PE)

Toll-free number Coprikompatt

800 508 747

[email protected]

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