Trenchless repair of separated PVC pipe joints
When separated joints do not automatically mean excavation
One of the most common situations identified during CCTV inspections is the separation or displacement of PVC pipe joints.
Many property owners immediately assume the only solution is to excavate the area, remove floors or replace the entire pipe system. However, this is not always the case.
In many drainage systems, the host pipe still maintains reasonable structural integrity, while the main issue is concentrated at specific joint connections.
This was exactly the situation recently identified during a technical assessment where two PVC joints had become disconnected, allowing infiltration and the entrance of external material into the pipe.
Although the joints had separated, the remaining pipe geometry appeared relatively stable, opening the possibility for trenchless rehabilitation instead of full excavation.
This distinction is extremely important because the correct diagnosis can completely change the repair strategy.
Why do PVC pipe joints separate?
PVC drainage systems can deteriorate over time due to a combination of structural movement, installation deficiencies and long-term stress.
Common causes include:
- ground settlement;
- poor bedding or insufficient compaction;
- failed glued connections;
- thermal expansion and contraction;
- structural building movement;
- excessive vibration;
- stress at directional changes;
- long-term hydraulic loading.
When joints begin to separate, several problems usually follow:
- infiltration;
- loss of watertightness;
- entry of soil and sediments;
- recurring blockages;
- bad odours;
- solids accumulation;
- progressive erosion around the pipe.
In commercial properties and older buildings, these issues may develop slowly for years before visible symptoms appear.
Excavation is not always the best first solution
Traditional excavation may still be necessary in severe structural failure scenarios.
However, many separated PVC joints can be rehabilitated internally when the host pipe continues to maintain acceptable alignment and structural continuity.
This is why a proper CCTV inspection is critical.
A technical evaluation helps determine:
- whether the pipe remains structurally stable;
- if deformation levels are acceptable;
- whether the displacement is compatible with liner installation;
- if infiltration is localized or distributed;
- whether trenchless rehabilitation is technically feasible.
Without this analysis, there is a risk of performing unnecessarily invasive and expensive construction work.
CIPP rehabilitation — creating a new pipe inside the old one
When conditions allow, one of the most effective solutions is CIPP rehabilitation (Cured-In-Place Pipe lining).
This method creates a new continuous pipe inside the existing drainage line using structural liners, often reinforced with fiberglass.
For separated joints and localized displacement, CIPP rehabilitation can:
- restore watertightness;
- eliminate infiltration;
- reconnect the hydraulic continuity of the line;
- reduce solids retention;
- reinforce structural performance;
- avoid major excavation works.
In structural fiberglass liner systems, the rehabilitated section may even achieve structural performance superior to the deteriorated original pipe.
Why trenchless rehabilitation is attractive for commercial properties
Excavation inside restaurants, shops, apartment buildings or operating businesses can create major disruption.
Traditional repairs often involve:
- breaking floors;
- dust and noise;
- business interruption;
- demolition and reconstruction;
- long repair periods;
- difficult access conditions.
Trenchless rehabilitation significantly reduces these impacts and, in many situations, allows the drainage system to be restored within a much shorter intervention window.
Not every pipe is compatible with trenchless rehabilitation
It is important to clarify that not all damaged pipes can be rehabilitated internally.
Severely collapsed lines, extreme deformation, critical settlement or complete structural loss may still require excavation or localized replacement before rehabilitation.
For this reason, REVIPOX always follows an inspection-first approach.
Compatibility is evaluated through:
- CCTV inspection;
- structural assessment;
- hydraulic behaviour analysis;
- geometry verification;
- deformation and alignment evaluation.
The objective is not simply to install liners everywhere, but to determine the safest and most technically appropriate solution for each situation.
Technical diagnosis before choosing the repair method
Separated PVC joints do not automatically mean the entire drainage network has failed.
In many cases, trenchless rehabilitation provides a safer, faster and significantly less invasive alternative to traditional excavation.
At REVIPOX, we carry out technical CCTV inspections and rehabilitation compatibility assessments to determine whether localized repair, structural CIPP lining or conventional replacement is the most appropriate solution.
