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The soil displacement method with non-steered displacement hammers
The soil displacement method is a method for underground pipe installation which has been established for the last three decades.
A displacement hammer, driven by pneumatics, creates a cavity underground, ready for pulling in short or long pipes made of plastic (PE, PVC or PE-X) and metal (e.g. St), preferably without socket ends, up to DN 200, but also any type of cable in drill lengths up to 15 m (depending on the soil quality), either simultaneously or in a second working step. This allows trenchless traffic route crossings, private service line installations, the preparation of anchoring, by-passing obstacles and supporting further measures.
Conditions for application
The site going to be bored must be sufficiently displaceable. A pit is required for the start. As a rule, the soil displacement hammer is lying on top of an adjustable bore rig. With the aid of telescopic sight, aim is taken and the height and sides of the machine are adjusted. The propulsion of the soil displacement hammer is performed by a piston driven with compressed air (normal job site compressor). External friction is required for the propulsion. If this is missing, in loose, soft soils, for example, external static support can be added.
This technique
Involves the need of two excavations (launch & receive), where the torpedo shaped mole is lined up on the target in the first pit, the mole is pneumatically powered & hammers it's way through the ground.
On entering the receive pit the mole is removed from the air line which is then attached to the pipe/cable to be pulled back through the hole that has been bored.
Ability
Smallest hole 45mm.
Ground suitability
Clays, silt, peat and generally soft cohesive material.
Unsuitable ground
Ballasts, sands, gravel, sub base formation, rock and the like.
Excavation Size
For small moves i.e. 45m up to 50m, the hole has to be approx 1.2 metres long x 0.5 metres wide x 0.8 metres deep.
Depth Guideline
10 x the diameter of product to be installed. i.e. 100mm Cable Duct to achieve recommended minimum boring depths, 1000mm.
Risk Assessment
This system is non-steered and non-tracked. However, the power of the equipment is such it is capable of displacing most minor obstructions without deviation.
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