One of the world’s leading manufacturers of UV CIPP, Brandenburger, has used its expertise to develop an innovative method for manhole rehabilitation.
The company’s latest development is the world’s first UV manhole liner that adapts to the shape of the manhole just through air pressure.
German politican and businessperson Hans-Olaf Henkel says “complacency is the greatest enemy of innovation and quality.” With this in mind, Brandenburger’s idea for the manhole liner BBS.8 came to life – a solution for manhole rehabilitation with all the advantages of UV relining.
The solution requires no pre-assembly and is produced and delivered by the metre. It is fully adaptable to the geometry of the manhole and the system includes renovation of the berm.
Along with the convenience of a quick installation time, the BBS.8 can be installed during dry weather flow and is a fully structured, leak tight liner system.
The following is an installation report of a project executed at the end of 2019 in the north of Germany using the Brandenburger BBS.8.
The customer and Brandenburger technicians began to renovate the first manhole at a busy intersection at dusk
using the manhole UV rehabilitation system. The manhole was being prepared: crampons were removed, everything was cleaned and the floor area laid out with protection foil.
The benefits of the BBS.8 were already noticeable in the preparation for the project. Since it is the first manhole liner on the market that adapts to the prevailing manhole geometry and with no complex measurement work required, there is no need to measure the ailing manhole before ordering the manhole liner. Only the pit opening and the nominal manhole size are relevant.
The first few meters were pulled out of the box and cut to the desired length. This was made possible by the special production process at Brandenburger where liners are produced by the metre.
Immediately afterwards, the second inner foil – called calibration foil – was dragged in to use the capabilities of the particularly stretchable GRP material and to enable it to expand right into the bottom.
The packer at the top of the manhole liner was placed, attached to the crane, pulled up and lowered into the manhole until it encountered the berm.
The BBS.8 was positioned. The compressor was connected and the liner was gradually increased to an inner pressure of 400 mbar. The material started expanding to the manhole walls and into the berm, adapting to the original manhole geometry.
The UV source was inserted into the liner. All lamps were ignited directly and the light source raised and lowered by hand five to six times with a speed of 50 cm/min.
The lamps were switched off, the pressure released and the packer lid was opened to release the curing heat.
The UV light source and both inner foils were removed, with liner remainders above ground to be cut with an ankle grinder.
As always, the Brandenburger BBS.8 provided a fast and easy manhole rehabilitation with all benefits of a fully structural UV liner.
This article was featured in the Summer 2020 edition of Trenchless International. To view the magazine on your PC, Mac, tablet or mobile device, click here.
For more information visit the Brandenburger website.
If you have project news you would like featured in Trenchless International contact Managing Editor David Convery at firstname.lastname@example.org