Trenchless Drilling Technologies

Trenchless drilling technologies are the methods of installing pipe and cable lines underground without opening a trench at the surface. In this section we describe the four methods Deltek applies in the field and the main components of horizontal directional drilling (HDD) one by one: what HDD is, the construction method and rig classes; drill rods, steering heads and reamers; walk-over and magnetic locating systems; drilling fluid. The other trenchless methods are pipe jacking / pipe ramming (pipe pushing, auger boring, microtunnelling), trenchless pipe bursting and the smart undergrounding approach. The topic guides are long-form pages that explain horizontal drilling, trenchless boring, microtunnelling and auger boring from the ground up.

Technology

Methods and components

A dedicated page for each trenchless technology — what the method is, how it is applied and which equipment it needs.

Horizontal Directional Drilling8 pages

What is HDD?What is horizontal directional drilling (HDD)? From the first crossing in 1972 to today: pilot bore, reaming and pullback; advantages and applications.

HDD Method StatementThe HDD construction method step by step: rig set-up, pilot bore, drilling fluid, reaming with the back reamer, and pulling the pipe in with a swivel.

HDD RigHDD rigs: thrust, pullback and torque; set-up and logistics of small, medium and large horizontal directional drilling rigs, and choosing the right machine.

Drill PipesHDD drill rods: diameter and length ranges, carbon and titanium alloys, CrMo threaded tool joints, friction welding, elastic deformation and use on site.

Steering HeadThe HDD steering head: duckbill head, sonde housing, steering with an angled bit, carbide and cone bits, and fluid-driven rock drilling with a mud motor.

ReamerThe reamer enlarges the pilot hole to the pipe diameter: staged reaming, fly cutter, barrel reamer and hole opener types, and matching the reamer to the ground.

Locating SystemsHDD locating systems on one page: walk-over and magnetic (wireline) tracking of the drill bit, their components, depth and accuracy limits, and how to choose.

Drilling FluidHDD drilling fluid: the six functions of bentonite, water and polymer mud — carrying cuttings, hole stability, cooling, pullback lubrication and protection.

Other trenchless methods3 pages

Pipe JackingPipe jacking methods: pipe pushing, auger boring and microtunnelling. Excavation type, face support, ground conditions, diameter limits and choosing the method.

Pipe BurstingTrenchless pipe bursting: using the old line as a guide, breaking it and pulling in a new pipe without excavation; 10–45% upsizing, no trench.

Smart UndergroundingSmart undergrounding: the concept Deltek brought to the sector — consultancy that plans trenchless methods within a measurable, sustainable system.

Topic guides3 pages

Long-form pages that explain horizontal directional drilling and trenchless boring from the ground up.

Trenchless BoringTrenchless boring applications: water and sewer, gas and power, fibre-optic lines. Rig characteristics, planning and the trenchless boring sector in Türkiye.

What Is Microtunnelling?Microtunnelling: pipe jacking with a remotely controlled closed-face machine. How it works, slurry and EPB machines, laser guidance, when it is chosen.

What Is Auger Boring?Auger boring: a steel casing is jacked from a shaft while a head on a helical auger cuts the ground ahead. Steps, guided auger boring, suitable ground, FAQ.

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