Description of the job
Asbestos decontamination of the Gan Tower in Paris La Defense
The Gan Tower is a 44-storey skyscraper built in 1974 and having a surface of 70,500 m2. This 179 metre-high building is the sixth highest skyscraper in Paris and one of the most famous; it was designed by architects Harrisson & Abramovitz and J.P Bisseuil.
In 2011, this building was refurbished and enlarged up to 250 metres of height
During the works, asbestos residues which were still present on many surfaces were removed. The interventions were carried out on technical systems, metal and flexible sheathings, cables, distribution networks and other asbestos-contaminated materials.
As the area to be treated was wide and time was limited (5 months), a TJV was created to carry out these works.
TIA worked on 10 floors with 50 workers on average.
Technical data
- Amount of the contract: 4.800.000 €
Data
Customer: Foncière des Régions
Area: Parigi
Construction site: Tour Gan
Year of completition: 2009
Description of the job
- Friable asbestos removal from ceilings and pipe coatings within tunnels, air conditioning ducts and shafts.
- Cement-asbestos roofing removal.
- Partial masonry demolition.
Critical points
- In order to respect the timing set for the refurbishment of the whole complex, demolition and remediation works were carried out in only 6 months. This required a huge organisation and coordination work.
- On average, 30 specialised workers were employed simultaneously in 7 work sites.
- Identification of all the asbestos contained in the building complex was a critical point. In particular, a complete mapping was carried out to find the underfloor pipes which had not been identified yet. A total of 3,600 linear metres of pipes were found, divided into bundles of 6 pipes each. The main problems were their location and conditions, which required working with extreme care.
Innovative solutions adopted
- In a previously reclaimed area, where there were still traces of paint and asbestos fibres on the ceilings, the hydro-sandblasting method was used. This innovative solution in the asbestos-removal field, implemented in a completely confined space (static and dynamic confinement), made it possible to carry out the work in complete safety, within a limited time and at a reasonable cost. The traditional procedure would have involved much higher costs.
- Amount of the contract: €. 2.324.056 (for asbestos removal only)
Technical data
Area treated:
- m3 630 of friable asbestos
m2 11.000 of cement-asbestos roofing
m 6.000 of asbestos-coated pipes
m 600 of asbestos-coated under-eaves ducts
- N° of work site managers: 3
N° of specialised workers: 30 - Waste disposed of:
Kg 190.000 of friable asbestos
Kg 210.000 of cement-asbestos
Data
Customer: Il Sole 24 Ore
Area: Milano
Construction site: ex stabilimento Italtel
Work Period: 6 months
Work Termination: September 2000
Description of the job
- Asbestos decontamination of the Winterthur tower in Paris
Friable asbestos decontamination carried out in the office complex called Winterthur tower.
The remediation was carried out on 18 floors + 9 underground floors. It was realised in 1999 and still is one of the most important friable asbestos removal interventions in Paris.
Technical data
- Amount of the contract: 3 million €
Data
Customer: Sogelym Steiner
Area: Parigi
Construction site: Tour Winterthur
Work Termination: 1999
Description of the job
- Materials to be removed are usually made of mineral wool with cement-asbestos or ceramic fibre finish; they are used in ducts, pipes and turbines, while the boiler body is made of single or multi-layered mineral wool.
- The intervention for the machine room of group 3 was carried out in the tunnel where the wireways being treated were fitted. Fire partitions are encapsulated in elastomeric material or similar materials and they are made of a compact and dense asbestos-based mixture, they are one metre long and half a metre large. approx. 100 points were remedied.
Critical points
Since the tunnel is particularly narrow and cannot be confined, the intervention was carried out using the following method:
- on the ground floor of the machine room, where the hatch is, a double-chamber access confinement structure was built without installing any decontamination unit; where the big bag was packed; an aspirator was fitted to clean the suits. A suitable aspirator was placed within the tunnel to clean the waste produced.
Only hard rubber tools were used (hammer, chisel, brushes). As some cables were live, suitable voltage-resistant gloves were used.
Removal and remediation operations were carried out simultaneously. During the removal phase, an air extractor was constantly working to prevent powders from being released into the atmosphere; its suction vent was located near the area being treated.
Technical data
- Amount of the contract: 540.000 euro
Data
Customer: Enel Power S.p.a.
Area: Civitavecchia
Operation: removing asbestos from the engine room, comun parts, ducts and pipes of group 3
Construction site: Torrevaldaliga Sud
Work Period: 4 months
End of works: June 2003