What it involves

Combined system repairs are often the only possibility to fix a pipe or establish a new one. Often a problem is considered and trenchless solutions will be ruled out because no one technique will deliver all elements of the project; in these scenarios McAllister Bros. advocate using a combination of systems such as spot excavation or ‘keyhole’ repairs to allow customers the benefits No-Dig techniques. Concept design is a key element. If the combined concept offers you benefits and value for money, we move towards creating a detailed design. The installation method is then found, trialled and installed. Often the installation is simple once the right method is found. A simple example would be the use of guided auger boring followed by CIPP lining. When boring from a shaft to a tunnel, it may not be possible to remove the casings and jack in a PE pipe. One solution could be to use UV cured CIPP lining to provide the structural pipe with a long-term design life. A frequently occurring problem is how to deal with collapses in runs where excavation is expensive. The McAllister Group frequently uses combined system repairs to ensure that no drainage problem is unsolvable.

Our Service 

  • Concept design is a key element, establishing what is known/unknown and the potential of integrating solutions.
  • If the concept combined solution offers you benefits and value for money, we would move towards constructing a detailed design working with an appropriate consulting engineer and where appropriate product manufacturers.
  • The installation methodology is then established, if appropriate trialled and then installed.
  • Often the installation is relatively straightforward once the right methodology is established and the ‘right’ people work as an integrated team to ensure no ‘boundary’ handover problems occur.

Our Process

  • A simple example would be the use of guided auger boring followed by CIPP lining. When boring from a shaft to a tunnel, it may not be possible to remove the casings and jack in a PE pipe. One solution could be to use UV cured CIPP lining to provide the structural pipe with an appropriate design life.
  • A frequently occurring problem is how to deal with collapses in runs where excavation is prohibitively expensive. The McAllister Group frequently uses combinations of solutions by adding strategic new chambers then pipe reaming through partially collapsed sections and CIPP lining ‘newly created sections’ that have no significant deformation but require long-term structural rehabilitation.

Requirements

  • Pipes where there is an overwhelming need to minimise excavation and trenched solutions.
  • The flexible nature of deriving the most relevant and effective solution means there are no hard and fast requirements.

When to use combination solutions

When single / traditional solutions have been discounted and the benefits of no-dig solutions for any or all of the solution are significant.

How we can help

Since starting work on waste water infrastructure in 1974, the McAllister Group has routinely considered, created and delivered solutions using integrated processes and products. Our collaborative approach and strong relationships with manufacturers, designers and supply partners has evolved to empower us to quickly build integrated teams to generate and deliver combined solutions. We can draw on experience, think laterally within the bounds of the infrastructure issue, collaborate, share information and secure the right solution for the client. Advances in technology allow us to create more effective solutions for our clients using a combination of individual trenchless solutions.