Trenchless pipe laying Comprehensive pipe systems

Trenchless pipe laying Introduction 03 01 horizontal directional drilling phase 1 : drilling the pilot hole 04 phase 2 : enlarging the pilot hole 06 phase 3 : pulling the pipe string 08 03 pulling through a casing 12 04 the benefits of trenchless pipe laying 16 05 the PAM offer 18 Ductile iron represents a reliable and advantageous alternative to the materials normally used in horizontal directional drilling. The sturdiness, modularity and durability of cast iron pipes is combined with proven technology to enable pipeline flexibility. A little history The horizontal directional drilling technique...

Horizontal directional drilling Phase 1 Drilling hole with bentonite and drill string DRILLING UNIT Truck with hydraulic unit, high pressure pumps, bentonite pumps Horizontal directional drilling enables a pipeline to pass under an obstacle, such as a canal, a river or a road. Unlike horizontal boring technique that require major excavation at both ends, the curved trajectory of horizontal directional drilling enables the pipeline to pass under obstacles starting from ground level. Horizontal directional drilling performance depends on several factors:  nature of the ground  stratigraphy ...

Exit earthworks and pipe Did you know It is common practice to select the final bore diameter using the following data. D = pipe socket outside diameter The bore diameter varies according to the diameter of the pipeline to be installed as well as the drilling length, the nature of the ground, the curve radius, etc. It may be necessary to carry out successive boring operations, using boring tools of increasing diameter, to obtain the correct diameter which is between 1.2 and 1.5 times the pipeline diameter. The boring head is fitted with injection holes, like the drilling head. Injecting bentonite...

Horizontal directional drilling Phase 3 Ballasting steps Ballast tube Bentonite Drilling hole Ballasting water PAM has designed and produced pulling heads to DN 1000 Once the boring operation is complete, the tunnel remains filled with bentonite. This acts as an excellent lubricant and facilitates the pulling of pipes by reducing friction and force on the joints. To reduce the pulling resistance of the assembled pipe string upstream, it may be necessary to install a guidance system fitted with support rollers. Furthermore, for pipelines with a diameter greater than 300mm, the hydrostatic thrust...

Pipe bursting This technique to replace old pipelines enables a damaged pipe to be replaced by a new pre-assembled Universal Ve type ductile iron pipes of an equivalent or slightly greater diameter, depending on the nature of the old pipeline. This technology is also used to considerably reduce the site impact. The pipes are assembled one by one in a launch pit. The exit pit must be able to contain the extraction machine. A hydraulic device pushes a drill string through the old conduit and on its return, with a bursting head attached, bursts the old pipe with the fragments remaining in situ,...

Pulling through a casing This laying method can be chosen for specific rehabilitation techniques (passing through an existing damaged pipe) or when laying new networks crossing a natural obstacle or in the case of trenchless works. When pulling through a casing, you must first define:  the centring and guiding of each element within the casing  the method used to anchor the elements together to guarantee the integrity of the section being installed  the method used to connect the section passing through the casing to the existing network  the best pulling mechanism from a technical and economic...

The benefits of trenchless pipe laying Lower social costs Lower indirect costs Lower direct costs  no interference with traffic  fewer road signs needed  more technical materials  less site security required  less damage to the environment  no diversion costs for distributors  no back-filling or compacting, no need to repair roads and pavements, etc.  little or no risk of accidents  no need to move street furniture  little or no risk of economic consequences for local businesses Savings compared to a traditional site.  less noise and air pollution for residents  lower equipment and...

The PAM offer A la carte solutions With coatings adapted to the ground conditions and the purpose your pipelines will serve (sewage, distribution and transfer of drinking water), PAM offers its range of Universal Ve pipes coated with:  Thick polyethylene until DN700  ZMU cement mortar until DN700 for rocky ground At the end of its life, PAM pipelines have the significant benefit of being infinitely recyclable through local systems (collection and recovery of scrap metal). This benefit arises from the use of ductile iron, which is produced mainly from recycled materials and is itself 100% recyclable...

Angular deflection and curve radius Allowable pulling forces (kN) The maximum allowable pulling forces are established based on the maximum pressure supported by the Universal Ve self-anchored joints. These values are subject to reduction by taking into account the specific dynamic constraints of each individual project (continuous pulling, pulling by pre-assembled section, pulling pipe by pipe). Did you know ' To form a 30° curve, only 10 pipes are required! (*) Allowable pulling forces for pipelines DN 800, DN 900 and DN 1000 The values in the table are for information only. Large diameter...

The material Drill performance Depending on the diameter of the pipes to be laid, the length of the path and the nature of the soil, different types of drilling rig must be used. Mass to be pulled in tonnes Maximum pipe string length Advanced technology In the pipeline laying field, PAM uses advanced technology that comes directly from oil drilling techniques. All PAM joints are protected by a metal shell to guarantee that the elastomer liners will be held in place, particularly in the event of accidental rubbing against the vault during pulling. Drill utilisation guide: SAFETY, SITE ORGANISATION,...