Asbestos removal

Asbestos (or asbestos) is a family of fibrous minerals and crystalline widespread in the earth's surface and widely used in industry and construction for its physical, chemical and low cost. It is found both in insulation products in jewelry and household products products (gaskets, coatings ...).

Inhaled by the body, asbestos dust is one of the main dangers in urban and industrial pollution. Asbestos is the subject of very strict legislation to control or eliminate it, often as a total ban.

Prrincipe asbestos removal and objectives

For buildings destined for destruction,

withdrawal prior'amiante containing materials (asbestos) should be performed whenever technically possible it'.

For buildings in use,

if the diagnosis finds that the presence of asbestos containing materials of'amiante friable (sprayed asbestos, thermal insulation and false ceilings) of which the state of conservation is a risk to the occupants, the work must be undertaken systematically by the owner.

Stages of the asbestos removal

Asbestos removal operations must comply with the regulations, which aims to ensure the safety of players and the environment of the area of ​​operations. They require equipment and protective systems important.

Before beginning the removal of asbestos itself, a dust is made and the premises are moved. All equipment (networks, partitions, fluids, doors, etc..) That are not in direct contact with asbestos and which are not contaminated by fibers are removed.

The treatment area is then confined. This confinement prevents leakage of asbestos fibers from the site. For this, the walls are protected and the area of ​​construction is sealed by techniques known as static or dynamic.

Containment "static":

Access to the building are sealed, the walls and floors are cleaned, then all non-washable materials and / or decontaminated the area to remove asbestos are isolated by physical means: double plastic, varnishes and paints, etc. .

The sealing of the confinement is then tested by introducing smoke, which must not s''échapper. 'air Permanent renewal of the site is necessary for: entrances and evacuation'air are arranged in tight'enveloppe.

Airlocks allow passage of personnel,

  • equipment and disposal of contaminated waste.
  • a respiratory (mask) for ventilation;
  • disposable coveralls;
  • gloves and disposable overshoes.

Containment "dynamic":

the dynamic confinement for the renewal of air exhaust in the area désamiantée with a partial vacuum from 'outside, in case of leakage in the'enveloppe tight, the movement would be so'air to the'extérieur the interior of the building, fibers'amiante n'étant not released into the'environnement.

'air Extractors fitted with efficient filters (so-called "absolute filters" that trap fibers'amiante), shall ensure that depression.

The system must repeat six times the volume of'air per hour.

The next steps involve handling of contaminated materials or friable asbestos-containing, in addition, the amount of particles in the confined environment increases dramatically during the asbestos removal operations.

Everyone involved in asbestos removal area is equipped with personal protective equipment dun:

  • a respiratory (mask) for ventilation;
  • disposable coveralls;
  • gloves and disposable overshoes.

Dismantling (or cleaning) is to remove materials that have been in direct contact or contaminated with asbestos fibers (suspended ceiling tiles, networks, etc.). Access to the materials containing''friable asbestos.

Materials containing'amiante free and made ​​available can be ripped off. Techniques'enlèvement preferred are those that:

  • limit'exposition stakeholders to asbestos dust;
  • cause the least'émissions fibers into the atmosphere;
  • facilitate'évacuation debris torn.

The technique known as "the wet removal" is the most effective in reducing dust emissions, the material containing asbestos is completely saturated with water before'être retiré.Une both'amiante removed, the surfaces are brushed and vacuumed.

At the end of asbestos removal, multiple inspections are performed before removing the site:

  • visual inspections of the state media by the company and the contractor,

then by an independent auditor;

  • dust levels of residual air exhaust;
  • visual inspection by the contracting'œuvre to check that there is no asbestos.

If the inspection is satisfactory, the first skin of the containment is removed. Measurements are performed 48 hours after recovery, to allow room for the dust to settle.

When the dust levels are less than 5 fibers / liter of air, exhaust air and containment barriers are filed and a final cleaning is done.

After removal and before re-occupation of the premises, the owners must make a final inspection of the surfaces treated by a qualified independent construction. Visual inspection of end of construction is completed by measuring the level of dust.

If it is less than 5 f / l, the premises can be re-equipped (particularly to meet the regulations on fire safety), then réoccupés.Si work did not allow the withdrawal of all flocking, lagging and false ceilings containing asbestos (the case of containment), periodic monitoring of the conservation status of materials should also be conducted every three years or during any substantial change in the work or its use.

Before and during pulling of asbestos, many pollutants are discharged waste sites and must be disposed of in accordance with the Code of the environment and are divided into three categories:

Category 1:

  • asbestos-containing materials (sprayed asbestos)
  •  personal protective equipment,
  • filters,
  • polyane films;

Category 2:

  • material or object that comes into contact with asbestos (construction debris, insulation, etc..) decontaminated;

Category 3:

  • smooth but contaminated materials decontaminated by washing (metal structures, pins heating, etc.)..

Waste Category 1 and 2 are placed in waterproof bags inside the site and transported to the waste chamber. The bags are cleaned once, placed in a second bag, washed himself before it leaves the confined area and then placed in large bags (big bags), to facilitate handling.

The latter, labeled "hazardous waste" are sent to treatment centers for inerting or landfill, depending on their nature. A slip of'amiante waste tracking their movements. The processing center will return the last part of the master'ouvrage, accompanied by a certificate of'acceptation waste and after treatment, it issues a certificate confirming that the waste has been traités.Les waste category 3, known "cleaned", are washed into the waste chamber and treated in conventional discharge.

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