The microtunneling equipment consists of:
Mikrotunneling / Nyílt Pajzsos technológia:
The process is the equivalent of known hydro-shielding for tunnel construction.
With this technology, pipe extraction, excavation and transportation are done simultaneously. The excavation of the soil is carried out by means of a shield equipped with soil-breaking spikes or high-pressure slurry. The forehead is supported by bentonite slurry or polymer slurry by creating back pressure corresponding to the groundwater and soil pressure in the soil, thus preventing excess soil and groundwater inflow. This slurry also provides the transport medium for the excavated soil, which is transported by high capacity slurry pumps to the surface separator. The slurry is separated from the quarried earth and returned to the quarry forehead. Separated wet land may be placed on site in tailings ponds or transported to designated landfill sites.
Before drilling begins, the exact starting and arriving coordinates are determined by geodetic methods and then recorded on the Microtunneling machine control computer. The drilling trail is then determined along with the required arcs. The direction and position of the drill is controlled by a laser beam directed at the sensor located at the cutter head, and the necessary direction changes are made by the computer using the guide rollers on the shield.
The essence of the technology is to create a pilot hole that runs along the axis of the utility tube, so it defines the millimeter accuracy of tube placement.
By keeping the pilot tube sections in constant direction, the pilot bore is completed to the receiving shaft.
The pilot shaft is fitted with a suitably sized expander (rider) on the pilot tube, and at the same time retracts the utility tube into the expanded hole.
ROUTE DRILLING - DIRECTED DRILLING - STEEL STEELING - CONCRETE TUBING - ROCK PRESSING - DIRECTED DRILLING OPEN PANEL MICROTUNNELING - STEEL WELDING - HOBAS TUBE MOLDING - TUBE SPRING TECHNOLOGY
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