Water Pressure-tight Wall Bushings for White Tank
Details
State-of-the-art construction technology provides that building basements are carried out as a so-called white tank. A white tank does not need an additional sealing since base plate and outer walls are constructed as closed tank by using concrete with high waterproofness according to DIN EN 206-1 and DIN 1045-2.
Since the earth electrode material will be covered with concrete layer of at least 5 cm (corrosion protection measure) there is no more humidity, the concrete is an insulation. An earth electrode therefore has to be installed outside of the white tank, usually in the blinding layer underneath the foundation plate.
(Ref.: DIN 18014 Fundamenterder – Allgemeine Planungsgrundlagen“:2007-09 be (Title English: Foundation earth electrode – General planning criterial).
The ring earth electrode meshes under the foundation plates installed according to DIN 18014 have to be connected with the main earthing busbar of the building for equipotential bonding.
The electrical connection with the ring earth electrode also has to be water-tight. DEHN has developed the water-tight wall bushing in accordance with the requirements placed on a white tank. For that reason explicit care was taken in the development to configurate the component requirements as reality conform as possible. The specimen were encased into concrete (Figure 1) and then submitted to a pressure-water test. In regular construction technology installation sites in a depth of 10 m (e.g. underground car parks) are quite usual. Such terms of installtion was simulated for the specimen and a water pressure of 1 bar was imposed (Figure 2). After the required hardening period of the concrete, the specimen were subjected to a pressure water test and examined for watertightness during a 65 hours longterm test. Another challenge was the capillary attraction of bushings. The capillary effect means that liquids (e.g. water) spread quite differently in narrow gaps, cracks or tubes (capillaries) in fact they will literally be sucked or drawn into the building. Such fissures and cracks may arise during the hardening and the concurrent shrinking process of the concrete. Therefore a professional, competent and correct installation of the wall bushing in the formwork as described in detail in the installation instructions, is quite important.
– Tested with 5 bar compressed air according to EN 50164-5
– Type for formwork installation with water barrier and double thread M10 / M12 for connection e.g. to the equipotential bonding bar
– Adjustable according to wall thickness by thread M10 and lock nut
– Bushing thread may be cut to length if necessary
– Including connecting piece (St/tZn dimension 30x4 mm) with square hole for connection with clamping frame at round conductors or cross unit at flat strips
Since the earth electrode material will be covered with concrete layer of at least 5 cm (corrosion protection measure) there is no more humidity, the concrete is an insulation. An earth electrode therefore has to be installed outside of the white tank, usually in the blinding layer underneath the foundation plate.
(Ref.: DIN 18014 Fundamenterder – Allgemeine Planungsgrundlagen“:2007-09 be (Title English: Foundation earth electrode – General planning criterial).
The ring earth electrode meshes under the foundation plates installed according to DIN 18014 have to be connected with the main earthing busbar of the building for equipotential bonding.
The electrical connection with the ring earth electrode also has to be water-tight. DEHN has developed the water-tight wall bushing in accordance with the requirements placed on a white tank. For that reason explicit care was taken in the development to configurate the component requirements as reality conform as possible. The specimen were encased into concrete (Figure 1) and then submitted to a pressure-water test. In regular construction technology installation sites in a depth of 10 m (e.g. underground car parks) are quite usual. Such terms of installtion was simulated for the specimen and a water pressure of 1 bar was imposed (Figure 2). After the required hardening period of the concrete, the specimen were subjected to a pressure water test and examined for watertightness during a 65 hours longterm test. Another challenge was the capillary attraction of bushings. The capillary effect means that liquids (e.g. water) spread quite differently in narrow gaps, cracks or tubes (capillaries) in fact they will literally be sucked or drawn into the building. Such fissures and cracks may arise during the hardening and the concurrent shrinking process of the concrete. Therefore a professional, competent and correct installation of the wall bushing in the formwork as described in detail in the installation instructions, is quite important.
– Tested with 5 bar compressed air according to EN 50164-5
– Type for formwork installation with water barrier and double thread M10 / M12 for connection e.g. to the equipotential bonding bar
– Adjustable according to wall thickness by thread M10 and lock nut
– Bushing thread may be cut to length if necessary
– Including connecting piece (St/tZn dimension 30x4 mm) with square hole for connection with clamping frame at round conductors or cross unit at flat strips
