![]() After two weeks, the job is done and dusted. On average, progress is 0.70 meters per minute. #Rem directional drilling full#In full 12-hour shifts, 221 meters of pipeline finds its way into the soil. Because the pipe string goes into the ground in a single step, not only is it easier on the environment and the construction budget, but construction time is also reduced considerably. Groundwater lowering is not necessary and time-consuming installation of sheet piling along the alignment is not needed. With Herrenknecht's Pipe Express® it is possible even in this difficult terrain. Pipe Express® thus decreases the impact on the environment and increases acceptance among the population.Ī reference project: in the Swedish capital, the drilling crew is faced with a tough task when installing a 1,036 meter section of a 48-inch water pipeline: water-saturated clay soil, with a decent groundwater level reaching to the terrain surface. Earth removal work is minimized and corridor widths are reduced by up to 70%. At the same time, the underground installation of the pipeline takes place. With the development of Pipe Express®, Herrenknecht is setting new standards in pipeline installation: a tunnel boring machine loosens the soil, which is conveyed directly to the surface via an accompanying trenching unit. The cool mission is crowned with successful project completion: the connection of the wind farm to the power grid operated by National Grid. With the Direct Pipe® method, potential frac-outs can be safely avoided. On this basis, the installed power cables can be cooled by the sea water. The trick is to have the smallest possible distance between the seabed and the protective pipe. There is nothing to stop Australian summer fun on the coast near Melbourne.Ĭase 2: As if made for the Direct Pipe® method: in very rough wind and weather on the Scottish North Sea, two 440 meter long cable conduits are installed underground between the coast and an offshore wind farm. Reconnection in the shortest time: three months after the old connection is cut the new line is put into operation. The 700 meter long pipe string with a diameter of 355 mm is then towed out to sea and pulled back to the mainland by the HDD-rig. After sealing, it is reamed from the rig side. Using a Herrenknecht HK250C HDD-rig, Australian drilling contractor Dunstans Construction Group first drills a pilot hole. Nothing must enter the biosystem that does not belong there. Unique and sensitive coral reefs worthy of protection are not to be affected by the necessary shore-approach operation. In the immediate surrounding area is not only Port Philip Bay, visited by about 4,000 ships a year, but also Point Addis, a 10 kilometer long underwater national park. The project environment does not make things easier. As a result, even in an emergency, such as a failure of the power supply and the hydraulic systems, at any time, the machine is firmly clamped in the rock mass.Ĭase 1: Shortly before the start of the tourism high season, a collapsing cliff in Australian Anglesea cuts off the sealink of a water treatment plant. This works mechanically on the principle of a self-locking toggle lever (automatic mechanical wedging). ![]() The engineering trick for a safe ascent: a sophisticated safety concept based on two mechanical back-up safeguards reliably prevents the Gripper machine from slipping back. In the event of prompt demand, the stored water will be used for electricity production. The steep hard rock project: a new, underground pumped storage plant designed to pump water from Lake Limmern back into the 630 meter higher Lake Mutt. For the construction of two pressure shafts at the new Limmern pumped storage power plant in the Swiss canton of Glarus, a Herrenknecht Gripper TBM tackles a 40-degree steep drive doubly secured. The beautiful landscape remains optimally unaffected by the underground action.Ĭase 2: Uphill it may be more strenuous, but for innovative tunnelling technology it is a safe alpine project. The solution: a 250 tonne HDD-rig (HK250T) from Herrenknecht: at up to 160 MpA and over a distance of 900 meters that includes cavities, it powerfully bores upward and builds the pipe string into the mountain. The steep challenge: a difference in height of 450 meters requires a powerful, agile and light machine for boring upward to close the pipeline gap. By means of a power plant turbine, water collected from the Asiago Plateau and the Astico Valley will be used to produce electricity. ![]() ![]() Case 1: In Val d'Astico, Northern Italy, renewable energy is to be generated from hydropower. ![]()
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