Pipe Repairs / Rehabilitation

Our customer-focused teams are highly skilled, highly trained, and bring years of experience to every job. They work with leading-edge equipment and materials to deliver trenchless solutions against pressing time scales, within budget, and meeting our customers' specific requirements with:

Gravity and Pressure pipe rehabilitation

UV-cured CIPP lining can not only restore flow capacity in your pipes, but improve it.

What is UV-cured CIPP lining?

Cured-in-place pipe (CIPP) lining restores old and damaged drainage and sewerage pipes. It is a trenchless technology, which means it does not require excavation. A flexible tube, infused with resin, is inserted into the pipe. The resin fuses with the existing pipe wall and cures to create an impermeable bond. Traditionally, CIPP lining was installed using resin that cured at ambient temperatures or was helped along with heat – usually applied through hot water or steam. Learn more about our ambient and heat-cured pipe lining.

UV-cured CIPP liners are different. They are infused with a resin that only sets under ultraviolet light. Whereas traditional CIPP liners are prepared on site, UV-cured liners are prepared in the factory and have a long shelf-life provided that they are not exposed to UV light.

CIPP liners are ideal for:

• Culverts, sewers, and drains under transport infrastructure.
• Pressure pipe rising main, process water
• Outfalls – particularly those discharging into sensitive water courses.
• Runs with connections into basements and residential homes.
• Sites with short working windows such as airports, office buildings, and shopping centres.
• Large diameter pipe lining and reinforcement.

Benefits:

UV-cured CIPP lining offers high-strength reinforcement, without reducing the diameter of the host pipe. It maintains a high flow capacity – in fact, super smooth liners can increase flow capacity, particularly in brick pipes.

Our engineers assess the site and control installation with equipment that boasts computer precision. Each step of the curing process is filmed and recorded to ensure factory-level quality control. UV-cured CIPP lining requires no water, practically eliminating the risk of environmental pollution.

Best of all, UV-cured CIPP lining is fast – our engineers can install manhole-to-manhole lengths within four hours.

Hybrid Rehabilitation

Not every pipe rehabilitation challenge can be solved with a single approach. McAllister’s customised hybrid lining systems can solve even the toughest problems.

What is a hybrid lining system?

Modern drainage and sewerage networks are complex systems. Sometimes, maintenance and rehabilitation using a single method is not possible. Hybrid lining systems provide a solution. They use a combination of methods and materials – such as steel cages, rubber tube sections, and CIPP lining – to solve specific challenges. In all cases, we strive to avoid excavation.

The benefits

Hybrid lining systems offer a solution when conventional lining techniques will not work. They are typically very thin, which means a minimal reduction of the host pipe’s diameter – usually around 6% of the cross-section area.

They allow us to rehabilitate old and fragile pipelines, where other methods such as piling or tunnelling may cause structural damage. Our steel and rubber sewer lining systems are usually temporary, with a design life of about five years. We can remove these components in sections, allowing us to inspect the host pipe safely, identify damage early, and reduce the risk of further harm. This piecemeal approach allows us to conduct repairs before removing the remaining sections.

Meanwhile, steel and CIPP lining combinations have a design life in excess of 70 years. They are used to restrain or route a CIPP liner through major diameter changes and large voids, or to facilitate a significant diameter reduction in deep sewers with restricted access. We can install lateral connections using specially-designed top hat systems.

Culvert / Tunnel GRP Lining

Our experienced culvert lining teams work across vast waterway networks to locate, assess and

rehabilitate culverts / tunnels using CIPP and GRP Lining.

What is culvert lining?

Culverts and tunnels are essential pieces of infrastructure that protect our transport corridors from flooding, water damage, and erosion. They look like simple structures, but they require careful design if they are to work well. The load they bear, the water flow they carry, and the type of soil surrounding them all need to be carefully balanced for the culvert or tunnel to succeed. They also require regular maintenance to ensure they are in good working order. Culvert and tunnel failures can lead to road collapses and flooding during storms, which poses a public safety hazard. Keeping them in good condition is vital work that will help to extend the life of more complex and expensive assets.

Delivery

Our teams will get to work, systematically rehabilitating the culverts and tunnels identified in the programme of work. They design and create GRP liners specifically for each application and with your future plans in mind. We conduct CCTV surveys on each liner as we complete its rehabilitation. We use this information to update the original survey data, to ensure you have up-to-date data on the location and condition of each asset under your authority.

Isolated patch repairs (CIPR and QuickLock)

McAllister’s cured-in-place and quicklock patches offer strong and reliable repairs for small areas of damage in your pipe network.

What is CIPR?

CIPR offers robust, long-lasting, and adaptable solutions for broken pipes and sewer lines. CIPR liners are flexible tubes coated with silicate resin which, when cured, form an impermeable bond between the liner and the host pipe wall. They are typically used to rehabilitate long stretches of pipe but, as the name implies, patch repair is a targeted approach. Our technicians use a small patch of liner to address localised pipe damage – such as root ingress. The edges of the liner patch are tapered to ensure a smooth flow transition.

McAllister offers CIPR in two varieties – traditional ambient-cured and UV-cured. Both offer strong, long-lasting repairs, but UV-curing is faster and more versatile. Our CIPR patch repair teams can deliver full structural repair bonding using either method – even in wet pipelines. They can also repair non-circular pipes, such as egg and box-shaped lines.

What is a Quick-Lock repair?

A Quick-Lock repair seals cracks, fractures and joints with a watertight EPDM rubber sleeve and a steel bracing ring. This mechanical solution requires no chemical products such as glue, laminates, or resins. EPDM rubber is used in a variety of applications where water-proofing is essential, like roofing and tank lining. The high-grade, V4A (316) steel bracing ring is made from materials with a long track record in drainage and sewerage construction.

We use three distinct types – Quick-Lock, Quick-Lock Big, and the Quick-Lock LEM System.

Quick-Lock

The basic Quick-Lock system seals pipes between 150 mm and 800 mm using robotic equipment and CCTV to install remotely.

Quick-Lock Big

Quick-Lock Big is for pipes wider than 800 mm and requires our technicians to enter the pipe.

Quick-Lock LEM System

The Quick-Lock LEM System is a liner end seal for UV-cured lining.

As their name suggests, patch repairs are for isolated repairs and are fast to install – our engineers can install a quicklock in just 15 minutes and CIPR can be between 2-4 hours. They require no flow control measures, yet provide long-term solutions. Our patching systems are WRc-approved, and comes with a 50-year guarantee. Patch repair, both CIPR and quiklock are suitable for most common types of sewer network damage including:

• cracks, fractures, and holes
• water infiltration or effluent exfiltration, particularly at joints
• realignment and sealing of displaced joints
• root intrusion
• sealing dormant or unused inflows
• liner end sealing