Horizontal Drilling Technology
Pilot Pipe Drilling 2.0 - FrontSteer
FrontSteer is a pilot pipe installation technique developed for challenging soil conditions. This method is used when conventional pilot pipe installation is not feasible. It enables the precise installation of steel casing pipes (DN 400 and 600) or sewer tunneling pipes (DN 300, 400, and 500) in rock, stony soils, and non-displaceable subsoils. The maximum drilling length is 80 meters.
Advantages of Pilot Pipe Trenching 2.0 - FrontSteer:
Application Criteria
Pilot Pipe Trenching with Soil Removal, Section 6.1.3.2.3
400 - 600 m
75 m
Steel, stoneware, reinforced concrete, concrete, polymer concrete, cast iron, PVC, KG, PE-HD-GFK, composite heating pipes
0,1%
LN 1–3 (i.e., including very dense soils), LB 1–3, S1 (stones), FD1, and FZ1–2 (light rock up to 40 MPa).
Precise, trenchless installation of steel protective casings for sewers, pressurized sewage lines, water mains, gas lines, heating lines, cable conduits, and drainage systems
Crossing rivers, roads, highways, rail tracks, buildings, open spaces, and natural habitats. Longitudinal installation in narrow sections, at great depths, and where there are many existing utility lines.
Procedure Description
This procedure is carried out in two phases as follows:
Phase 1: Guided Pilot Drilling
The execution of steered pilot pipe drilling in compressible soils involves the use of pilot pipes (outer diameter 114 mm) equipped with an optical sight, a steering head, a theodolite with a CCD camera, and a monitor. The pilot pipe is pressed through the soil into the target pit, with direction and inclination monitored throughout. The beveled surface of the steering head allows the bore to be steered in all directions, thereby preventing deviations from the planned bore path.
Phase 2: Expansion Drilling
In loose to moderately dense sand and gravel soils, a passive reaming stage is used. In this case, the drill head runs set back within the protection of the steel pipe. In dense soil conditions, it is no longer possible to press the ribs of the passive reaming stage into the soil. An active expansion stage is therefore used, in which a cutting disc runs immediately in front of the steel pipe. The openings in the cutting disc can be reduced depending on the expected stone diameter, thereby minimizing the risk of potential ground collapses. During tunneling in groundwater, so-called “groundwater locks” are used.
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