Crane Demolition of Prefabricated Panel Houses
The method for demolishing prefabricated panel houses using cranes should be selected based on a combination of factors such as floor height, building structure, and surrounding environment. Common methods include using extended arms with breaking tools, large cranes to hoist excavators for operations, and demolition by iron ball impact.
For prefabricated panel houses with low floors, the preferred approach is to use a combination of extended arms, hydraulic shears, and breaking hammers. Extended arms can expand the crane's operating range, allowing operators to dismantle the building structure from a safe distance. Hydraulic shears are suitable for cutting metal components such as steel bars, enabling quick separation of the prefabricated panels from the wall connections. Breaking hammers, through high-frequency impact force, break down concrete structures, gradually dismantling the house. This method is relatively efficient and has minimal impact on the surrounding environment, but it requires sufficient operating space for the crane to avoid stability issues due to excessive arm extension.
If the house has multiple floors or a complex structure, consider using a large crane to hoist an excavator to the top floor for top-down demolition. This method requires a rigorous assessment of the building's structural type, such as the load-bearing capacity of shear wall or frame structures, to ensure that partial damage does not lead to overall collapse during demolition. At the same time, a risk assessment of the surrounding environment is necessary, including potential hazards such as excavator tipping and flying building debris, and an emergency plan should be developed. The experience of the operator is crucial, as they need to accurately predict each movement and destructive action to avoid accidents caused by operational errors.
In addition, some demolition teams abroad use cranes to suspend heavy iron balls for impact demolition of houses. This method converts the gravitational potential energy of the iron ball into impact force, directly destroying the building structure, and is suitable for buildings with weak impact resistance, such as brick-concrete structures. However, this method requires high operational precision, with the need to control the impact force and frequency to avoid damage to surrounding buildings or ground subsidence due to excessive impact. It also generates significant noise and dust pollution, so it should be carried out in open areas or after taking protective measures.
