Concrete means spending.
Today, the concrete inspection chambers are far more widely spread than the polyethylene ones: this can be explained by the habit and also by the large number of concrete manufacturers on the territory. On the other hand, in the most advanced countries and in the developing ones – where the technical and economic factors are analyzed without prejudice – the polyethylene inspection chambers are the most spread ones. Thanks to the KMC inspection chamber, there are no reasons left to discriminate polyethylene:
This product has actually been successfully utilized worldwide for over 30 years. In the piping sector, for instance, the trend is opposite: everyone knows the issues deriving from the concrete pipes. Few know that strict reference standards are to be complied with for both concrete and polyethylene, and even fewer know that – in all the European markets for building products with the EC conformity mark – the declaration of conformity has been replaced by the declaration of performance. Not only must the manufacturers comply with the standard, but they must have also run all the specified tests before releasing the product on the market. Furthermore, such checks must be periodically repeated.
The reference standard for the concrete inspection chambers is EN 1917 2004 “Concrete manholes and inspection chambers, unreinforced, steel fiber and reinforced with steel fiber and traditional reinforcements” together with national standard UNI 11385. The reference standard for the polyethylene inspection chambers is EN 13598-2 2009 “Specifications for manholes and inspection chambers in traffic areas and deep underground installations”. Both standards specify the performance requirements and describe the test methods. The main characteristics resulting from the tests must be:
- Mechanical strength
- Payload for pre-assembled steps (if any)
- Water tightness
- Durability – service conditions as appropriate to the specified utilization
The manufacturer must draft, preserve and deliver upon request all the documents which certify the performance of the tests.
Both the strong and the weak acids are harmful to the cement paste. The hydrogen sulphide, which is present in all the common sewage systems, corrodes the inspection chamber. In these conditions, the concrete loses 5 to 10 mm of thickness per year.
The concrete inspection chamber starts corroding as soon as put into service.
The high rigidity of the structure, which ensures its good static resistance, may generate cracks in the structures and – mainly – displacements of the junctions because of the continuous vibrations due to the traffic and to the micro-settlements.
In the concrete inspection chamber, cracks generate in time.
Significant studies have shown that – compared to the concrete inspection chamber – to produce a polyethylene inspection chamber – 75% less of CO2 s released into the environment. These data do not yet take into account the factors of transport, maintenance, efficiency, duration in time and recyclability at the end of its life span.
The KMC inspection chamber respects the environment.
Important studies have shown that – compared to the polyethylene inspection chamber – to produce a concrete inspection chamber 400% more of C02 is released into the environment. These data do not yet take into account the factors of transport, maintenance, efficiency, duration in time and recyclability at the end of life span.
The concrete inspection chamber does not respect the environment.
EASY TO INSTALL
SAFETY ON SITE
Impermeability, chemical resistance, static and dynamic resistance, longevity, easy handling, reduction of the risks on site, adaptability, reduced maintenance: all this factors contribute to the cost-effectiveness of the polyethylene inspection chamber.
The KMC inspection chamber is technically and economically advantageous and can be considered an investment.
Infiltrations, low chemical resistance, vulnerability to vibrations, unpredictable life span, difficult handling and installation, the high risk on site, the difficult adaptability, the need of frequent maintenance are factors which affect the cost-effectiveness of the concrete inspection chamber.
The concrete inspection chamber is neither technically nor economically advantageous and it can be considered a mere expense.