Skip to content

Courses Guided Horizontal Boring

ST01G-FHG FREN

Guided Horizontal Boring

A guided pilot hole before the casing is installed: the precision of directional drilling applied to steel casing boring.

Crew and guided boring machine in a shored launch pit

Module preview

4 of 19 slides, as they appear in the module.

Slide 1 Guided horizontal boring
The method in six steps
1. Set up the pilot guide boring equipment
2. Bore the pilot guide with directional control.
3. Install the adapter between the bored rods and the steel casing.
4. Set up the casing boring equipment pipe ramming or augers.
5. Bore the casing intermittently to gradually remove the pilot rods as the casing advances.
6. Empty the casing and/or remove the equipment
Slide 9 The method in six steps
Slide 11 Step 1: another setup example
Why conventional pipe ramming lacks accuracy

In theory, a ram should not deviate significantly. Experience shows, however:

Ramming length Expected deviation

30 m or less ± 0.5%
From about 30 m to 45 m ± 1.5%
Beyond 45 m No reliable estimate

Pipe ramming systematically drops, deviates toward the softest layer (vertical or horizontal) and deviates sporadically when cobbles or boulders are encountered.

Slide 16 Why conventional pipe ramming lacks accuracy

Guided horizontal boring adds a step to steel casing boring: a pilot hole bored “dry” with dual rods and an LED target, which then guides the casing.

The module details the six steps of the method, the equipment and the questions to ask when pilot boring gets difficult.

Objectives

By the end of the module, you will be able to:

Explain the principle of the guided pilot hole and dual rods
Describe the six steps of the method
Anticipate the difficulties of pilot boring

Outline

Principle: the pilot guide hole and dual rods
Two ways to guide a casing bore
The six steps of the method
Lessons learned: boring the pilot hole

Other modules

FREN ST01G-FHD

Horizontal Directional Drilling

60 min — training duration

Buy $99.00+ tax
FREN ST01G-CFD

Pipes in horizontal directional drilling

60 min — training duration

Buy $99.00+ tax
FREN ST01G-FHR

Horizontal directional drilling tools in rock

60 min — training duration

Buy $99.00+ tax
FREN ST01G-FON

Steel Casing Pipe Ramming

30 min — training duration

Buy $50.00+ tax
FREN ST01G-TAR

Auger Boring

30 min — training duration

Buy $50.00+ tax
FREN ST01G-MFT

Down-the-Hole Hammer

45 min — training duration

Buy $75.00+ tax
FREN ST01G-SST

Health, Safety and Environment in Trenchless Work

45 min — training duration

Buy $75.00+ tax