**Demolition Techniques and Safety Measures**:
– Steps before demolition: asbestos abatement, hazardous material removal, permits, notifications, utility disconnection, rodent baiting, safety and work plans development.
– Razing process: hydraulic excavators, controlled falling direction, wall undermining, wrecking ball, high reach excavators.
– Demolition methods: hydraulic hammers, shear attachments, inside-out method, Vérinage technique, computer-controlled hydraulic jacks.
– Dust control: wet demolition using fire hoses, fixed location hoses, elevation hoses.
– Bridge demolition: hoe rams for concrete, hydraulic shears for steel.
**Building Implosion**:
– Implosion process: fast collapse with explosives, controlled falling into footprint, risks of flying debris, partial collapse, air overpressure.
– Implosion failures: potential disasters, risks of unstable structures, difficulty in approaching un-detonated explosives.
– Controlled implosion: last resort method, common for large buildings, J. L. Hudson Department Store and Addition.
– Implosion dangers: shock wave energy, dispersal in the sky, outward shock wave, damage to surrounding buildings.
– Implosion safety: expert planning, considerations for urban areas, risk assessment for neighboring structures.
**Preparation for Demolition**:
– Cleanup requirements: meeting quality standards.
– Safety measures: asbestos abatement, hazardous material removal, permits acquisition, utility disconnection, rodent baiting.
– Notification procedures: submitting necessary notifications, developing safety and work plans.
– Utility disconnection: essential step before demolition.
– Permit acquisition: necessary for demolition activities.
**Deconstruction and Waste Management**:
– Deconstruction aims to minimize landfill waste by segregating and reusing materials.
– Landfill diversion rates exceeding 90% in some cases.
– On-site crushers for demolished concrete reuse, timber waste for composting or manufacturing.
– Strict safety regulations on deconstruction sites.
**Teardowns and Urban Renewal**:
– Teardowns involve demolishing for new structures.
– Popular term in real estate since the 1990s.
– Chosen when land’s value surpasses existing building.
– Municipal codes regulate teardowns, impact on historical and architectural value.
– Urban renewal involves land redevelopment in cities.
