TRENCHLESS SOLUTIONS FOR CIVILS & UTILITIES

Trenchless pipe installation and sewer rehabilitation minimises costs, reduces environmental impact and cuts disruption to road users, the public and local communities

With increasing demand on the public sewer network, disruption to users from essential engineering work has to be minimised. Works which can be safely carried out without disrupting customers or the public offer a realistic and cost-effective alternative to open cut trenching.

Whether you need to rehabilitate worn out sewer pipes, increase sewer capacity or install new pipes, trenchless technology is the most efficient and least intrusive engineering solution available. Many people think that open cut trenching is cheaper but in busy locations this is just not true. Trenchless technology enables pipes to be installed, upsized or rehabilitated with little or even no disruption to the local area.

Trenchless technology produces a fraction of the waste generated by open cut working and requires less newly quarried material for backfill. Time on site is often significantly shorter as well. All of these factors make trenchless technology a cost-effective and environmentally responsible solution

The benefits
Perco’s indepth experience and its wide range of trenchless techniques give many benefits to utilities companies and contractors alike. Perco works flexibly to meet client requirements and can operate on a sub-contractor basis or offer complete turnkey solutions including feasibility studies, scheme design, enabling works and reinstatement post works.

Unlike many other trenchless technology contractors, Perco can provide a range of techniques to meet different ground conditions, site access and land availability, meaning that we can give unbiased advice about the best solution for a given situation.

• Pipes and cable ducts can be installed under roads, railways, canals, rivers, buildings and open spaces
• Pipe upsizing, cleaning, rehabilitation and repair projects can be carried out with little or no impact on surface operations or surrounding areas
• Perco holds ISO9001 and is an Investor in People

Techniques

New pipe and cable duct installation

• Optically guided auger boring
  Optically (or laser) guided auger boring is the best solution for installing pipes and cables ducts when accuracy and surface movement restrictions are critical and access is limited. Accuracy tolerances of +/- 40mm in a 50 metre shot are routinely achieved. Also important is the ability to achieve +/- 3mm settlement at surface level which negates long term settlement.
• Microtunnelling
  Where ground conditions are unsuitable for guided auger boring, yet a high degree of accuracy is required, microtunnelling offers many advantages, including the ability to install product pipes in a single pass. Microtunnelling offers an alternative to long sections of open cut trenching with its associated hazards and disruption to the community.
• Headings
  In city centres, key traffic routes and areas of restricted access, this traditional technique is widely used. It is perfect for installing new sewers and replace existing pipes without disruption to surface operations. Headings can be launched from within existing buildings or from access shafts on site.
• Shaft sinking
  As part of our services we construct access shafts to install new sewer connections. Shafts can be sheet pile, timber frame, concrete bolted ring or caisson type. Concrete shafts are usually converted to manholes after works have been completed.
• Directional drilling
  Where sufficient access is available directional drilling provides an accurate and cost-effective method for installing new pipes under roads, railways, rivers and canals. The shallow arc profile of the installed pipe makes it suitable for cables and pressurised water mains but not suitable for gravity sewers. Accuracy tolerances of =/-100mm can be achieved.
  
  

Sewer pipe rehabilitation
Perco has unrivalled expertise in sewer rehabilitation, replacement and upsizing. Several of our techniques are ideally suited to facilities as they can be operated with minimal or even zero disruption to the surrounding area.

• EcoCIPP™ lining
  Ideal for the quick rehabilitation of worn out and damaged gravity sewers, drainage and ducts. EcoCIPP is a seamless GRP liner system reinforced with UV cured resin which can be installed from existing manholes with little or no interference to the public or the facility’s operations.
• Pipe bursting
  Where existing gravity sewer pipes or ducts need to be replaced or upsized, Perco offers a range of pipe bursting solutions capable of upsizing pipes from 75mm ID to 1200mm ID. Perco’s miniburst, manhole bursting and Expandit™ techniques can be operated from existing manholes.
• Slip lining
  An economical repair solution where the existing internal diameter isn’t required; slip lining can be carried out using continuously welded or Snapit™ segmental pipe sections.
• Pipe cleaning and CCTV
  We offer a range of pipe cleaning techniques including pigging, high pressure jetting and debris removal to return sewers and drainage pipes back to full capacity. We also carry out CCTV surveys and condition reports.