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This laying technique is particularly environmentally friendly, since it causes minimal ecological damage, which is restricted to areas in close proximity to the system. Various factors also highlight the need for this directional drilling technology even in urban areas: The technique is superior for laying in open trenches in terms of construction times and costs, approval procedures, earth displacement, surface reclamation and traffic disruptions.
Earth displacement methods have proven their worth for three decades as a technique for underground pipe laying. Using a pneumatically driven displacement hammer, an underground cavity is created, in which long plastic or metal pipes of up to DN 200 can be inserted, preferably without joint ends. The pipes are inserted in lengths of up to 40 m and depending on the soil, this can be done either simultaneously or in a second individual operation. This technique allows trenchless crossing of transport routes, building connections, preparation of anchorages, circumvention of obstacles and other measures.
The ramming method involves pneumatically actuated pipe hammering machines deployed for dynamic pipe jacking. This method allows open steel pipes as casing or product pipes up to 4000 mm in diameter to be installed over lengths of up to 80 m in soil classes 1-5 (partly even soil class 6 – easily soluble rock) particularly economically without jacking abutments under track systems, highways and rivers.
The plow technique has been successfully used since the 1970s for laying power and telephone lines. It is particularly suitable for large, open sections in rural areas where long lengths of pipeline are required. However, the plow method can also be employed over shorter distances and for pipes in less accessible locations. Laying such pipes on steep slopes and traversing areas of water (up to 1.20 m deep) is no problem from a technical perspective thanks to the blade shape with four jibs adjustable in all directions.
The Burst lining method is a tried and tested technique, which is used in accordance with the latest generally recognized technical standards. The bursting machine proceeds through the old pipe, shatters it with dynamic impact energy and pushes out the fragments into the surrounding soil. At the same time, a new pipe of equivalent or larger diameter is threaded. The old drilling path must be usable for the new pipeline. To ensure safe, leak-proof and professional joints, side ports or curves must be open. The soil around the old pipeline must be displaceable and the distance to the existing lines should be > 0.5 m.
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