The roller blade – to be revealed at the No-Dig 2008 exhibition in Moscow – consists of a basic body, the exchangeable guiding strip with the guiding rollers and roller blade strips, which are also exchangeable
The basic body is intended for pipes with a diameter range of 400 to 1,000mm. The quantity and arrangement of the guiding strips, which hold the old pipe in a stable circular position during the bursting process, depends on the available diameter.
In this case a total of 11 guiding strips with their guiding rollers hold the roller blade aligned to the old pipe. The precisely aligned guidance is important for a clean cut in the pipe sole. During the cutting process the guiding strips take over the task of keeping the circular cross-section of the old pipe in place. In order to make sure this is guaranteed, the positioning of the rollers inside the guiding strips can provide an exact adaptation to the actual old pipe diameter.
The cutting process itself is carried out by a 3-step assembled roller blade strip. The first roller blade is an innovative development and will be applied when the old pipe diameter has partially decreased below the diameter caught by the second cutting roller.
The main cutting work is carried out by the second roller blade. The third roller blade allows pipe sockets or repair sockets to be cut apart. The cutting line can be situated at a distance of up to 150 mm from the outer coating of the old pipe.
The roller blade is equipped accordingly for the renewal of large scale pipes. It’s length of 1,600 mm provides a solid alignment in the longitudinal direction. The swivel integrated in the basic body provides an instant pulling force lead.
The pulling forces of up to 2.500 kN are transferred to the roller blade via the Quick-Lock rods, which have a length of 2,200 mm and weight of 220 kg.
Advance planning, careful preparation work and the ability to master the technical and logistical requirements during the jobsite process, are the main factors for completing these jobsites successfully.