Question

Discuss the following methods of Demolition.

Hand Demolition

Pusher arm demolition

Demolition by Explosive

Demolition ball technique

Answer 1

Solution:

Hand Demolition :

Demolition is the method of dismantling or removing a structure. In civil engineering, demolition ( generally ) refers to the dismantling of a building or structure by pre-planned and safe methods.

In hand Demolition, the dismantling is done by using the tools manually ( by using hand tools ) such as sledgehammer, crowbar, wonder bar, screw bar, drillers etc. This method used for small and precise demolition work. This work is time consuming and lot of man power is required.

Pusher arm Demolition :

In pusher arm Demolition method , the process of demolition is done by a bulky metal arm which is pushed in the direction of demolition to be done. The metal arm is mounted on a wheel chasis and is free to rotate. This method is also not suitable for the demolition of large buildings and is generally used for the demolition of small buildings.

Demolition by Explosive:

In demolition by Explosive method, explosives are placed at well defined locations of the structure and is blasted in order to demolish the structure. This method is very fast and doesn't require any heavy machines at the site. It causes least destruction to the nearby buildings and environment.

Demolition ball Technique :

In demolition ball Technique, the structures are demolished by a ball ( metal ball of high mass ) hanged on the boom of the crane. The ball is made to strike the area where demolition is to be done . The ball is swung again and again and the area of interest is hit in order to carry out the demolition process. This method requires highly trained operators as any error can cause great damage to the life and property of the neighbouring areas