Trenchless technologies have advantages over open-cut rehabilitation. Trenchless technologies include pipe-bursting, modified cross section, sliplining and cured in place process.
Open Cut Sewer Rehabilitation Methods vs. Trenchless Rehabilitation Methods:
Open Cut Rehabilitation Methods
Trenchless Rehabilitation Methods
Fully excavates defective pipe and exposes complete underground infrastructure
Limits excavation to relatively small access pits, so long sections can be replaced without surface disruption
Requires labor-intensive digging of open trenches with heavy equipment
Requires significantly less labor and limits use of disruptive heavy machinery
Causes public disruptions by re-routing surface traffic
Limits public disruption to surface traffic
Causes environmental damage and safety risks, such as harm to pedestrians and construction workers
Limits the externalities associated with open cut sewer rehabilitation techniques
Requires coordination between several construction companies and authorities
Can be implemented by smaller construction crews
Superior long-term inflow and infiltration reduction
Superior long-term inflow and infiltration reduction (pipe bursting only)
