Ground screw construction support WS004/WS006 76/1600

Instead of digging holes and pouring concrete for every post of the structure, you screw a long metal tube into the ground, like a giant screw. Only the end remains above ground, to which the post is attached. The foundation is ready on the spot, without waiting whole days for the concrete to harden, and at the end of the service life it can be extracted and reused.

The screw goes 1600 mm into the ground and takes both the weight of the structure and of the snow above it, and the uplift and overturning forces produced by the wind. It weighs 9.00 kg per piece and has an inner diameter of 76 mm, with a 3 mm wall, so it can be handled by one person, but it is screwed in mechanically. Hot-dip galvanised protection is mandatory here: the part sits permanently in moist soil, where unprotected steel would rust quickly. How many screws and of what length are needed is not a matter of guessing, because the bearing capacity depends directly on the type and compactness of the soil: it is determined after a geotechnical survey and, ideally, after pull-out tests on site.

Code 32-05-05.0005U, hot-dip galvanized steel tube, inner diameter 76 mm, wall thickness 3 mm, length 1600 mm, weight 9.00 kg/piece. Intended for Corab WS-004 ground-mounted systems; the post is fixed with 3 M666-type screws, and the manufacturer recommends ordering it together with gasket 32-05-05.0006A. Installation with a screwing head on hydraulic machinery or with a dedicated manual tool, without excavation and without concrete, with the possibility of dismantling and reuse. Corab warranty for mounting structures: 10 years standard, extendable to 15 years by registration, up to 25 years on coating and perforation.

Who it suits

Suitable for anyone installing panels on the ground - photovoltaic park, structure in the yard or an installation that must be able to be dismantled - on land studied geotechnically.

Terms explained

• Hot-dip galvanising: Immersion of the part in molten zinc; the result is a thick anti-corrosion protective layer, suitable for permanently buried elements.
• Uplift load: The force with which the wind pulls the structure upwards and tries to take it out of the ground.
• Geotechnical survey: The analysis of the soil on the site, which shows how well a foundation holds in that place.

Technical specifications

Recommended applications

• Foundations for ground-mounted photovoltaic parks and free-standing structures
• Sites where concrete foundations are to be avoided
• Fast installation, without excavation and without concrete curing time
• Temporary or reversible installations, with the possibility of dismantling and reuse

Warranty

Corab policy for mounting structures: 10 years standard, extendable to 15 years by registration, up to 25 years on coating and perforation

Technical details

Specifications confirmed from the manufacturer's datasheet

The Corab WS004/WS006 76/1600 ground screw, code 32-05-05.0005U, is the foundation element for ground-mounted photovoltaic structures in the Corab WS-004 range. It is screwed mechanically into the ground to a depth of 1600 mm and takes both the vertical loads from the weight of the structure and the snow, and the uplift and overturning loads generated by the wind.

Structurally it is a steel tube with an inner diameter of 76 mm and a wall thickness of 3 mm, with a weight of 9.00 kg per piece, protected by hot-dip galvanizing. Hot-dip galvanising provides a thick and adherent coating, indispensable for elements permanently buried in the soil, where moisture and soluble salts create severe corrosion conditions.

The ground screw is installed with a screwing head mounted on hydraulic machinery or with a dedicated manual tool, without excavation and without concrete, which drastically reduces the execution time and allows dismantling and reuse at the end of the park's service life. At the top, the structure's post is fixed with 3 M666-type screws, and the manufacturer recommends ordering it together with gasket 32-05-05.0006A.

The choice of the length and diameter of the ground screw is made on the basis of a geotechnical survey and, ideally, of in-situ pull-out tests, because the bearing capacity depends directly on the type and compactness of the soil.