THIS IS WHAT TRENCHLESS REHABILITATION COSTS
The costs of a rehabilitation are subject to many factors. No construction plan is the same as another or can be seen as a standard. Each project must be reassessed and calculated by an expert by the client and the contractor.
In addition to the existing approaches for machines, staff and material, the external circumstances also have a major influence on the overall costs.
The overall extent of the construction plan also plays a role, like the dimensions, pipe lengths and number of laterals. Furthermore, the condition of the pipes is an important factor for any preliminary work that may be necessary. The necessity of bypass pumping is also of great relevance to the costs. Bypass pumping can, depending on the through-flow amount and dimensions of the sewer, be a quite considerable item in the calculation.
The location and depth of the pipe is also an important point. Is there good accessibility and an easy approach to the manholes or must preparatory work be carried out here? Or is there increased work to be expected due to poor accessibility or a great depth? Rehabilitation in the area of roads with a large amount of traffic or motorways generally requires more work for preparation and execution.
A requirement for successful rehabilitation is that the correct rehabilitation method in terms of quality and cost-effectiveness is chosen. A number of different materials and installation procedures are available to the client, from which they must choose the correct one.
Our illustrations show where UV technology tends to have particular strengths. With these comparisons, we are limiting ourselves to a comparison of the UV systems to synthetic fibre systems, because both these rehabilitation methods are widely-established in the market.
In principle we want to note that each rehabilitation method has strengths and that no quality comparisons are being made here; it is only to show when UV technology with a GRP liner can be the more cost-effective solution.
The figures behind the pictures are based on the following fundamentals:
Damage class II
Amount of water: average
Pipe length: 60 m
The illustration shows the two most important influencing factors – material price and installation costs. The other parameters were shown in the two categories.
Not considered are the social costs, such as long closures of roads in urban areas, impairments to accessibility of businesses and lost revenue that may result from this, noise over a longer period of time, etc.
This consideration is not significant for either of the two systems shown, because both systems are trenchless. However the social costs must be considered if both variants are compared to open construction.