borrsprängning

Borrsprängning, also known as directional drilling or horizontal directional drilling (HDD), is a construction technique used to install underground pipelines, cables, or conduits with minimal surface disruption. This method employs a surface-launched drilling rig to bore a pilot hole along a predetermined, curved path beneath the ground. Once the pilot hole is successfully completed, a reamer is attached to the drill string and pulled back through the pilot hole, enlarging it to the required diameter. Finally, the product pipe or conduit is pulled through the enlarged hole.

The primary advantage of borrsprängning is its ability to bypass obstacles such as rivers, roads, buildings, and environmentally sensitive areas. This significantly reduces the need for open trenching, thereby minimizing traffic disruption, environmental impact, and restoration costs. The process begins with detailed planning, including geological surveys and precise trajectory design. Specialized drilling fluid is used to stabilize the borehole and lubricate the drill bit. Guidance systems, often utilizing electromagnetic locators, allow operators to steer the drill head accurately along the planned path. Borrsprängning is a versatile technique applicable to a wide range of ground conditions and project scales.