Demolition Methods for Buildings and other Structures

Demolition Methods for Buildings and other Structures


There are two types of demolition methods used for buildings and structures

  1. Non-explosive demolition
  2. Explosive demolition.

1. Non-Explosive Demolition Method

It means the demolition of a structure done with some equipment without the use of any   explosive. Different equipment’s used for the demolition activity are

a) Sledge hammer

It is a small handheld hammer used for the demolition of small wall or single column.

b) Excavators and Bulldozers:   These are big machines uses to demolish building of small sizes. They are used for excavation of soil or transferring of debris to trucks etc.

c) Wrecking Balls

The building with the greater height up to (6-7 story) cannot be demolished with the help of excavators or bulldozers.  In such cases crane with wrecking balls are used to perform the demolition activity. The wrecking ball crack is crack attached with a huge steel ball hanging from a steel rope. The steel ball is pulled and released towards the building. The steel ball with force strikes the building and the part of the building is demolished. This method is not recommended as the trajectory of the steel ball cannot be controlled after it strikes the structure.

    d) High Reach Excavators

High Reach Excavator machines are used in the demolition of tall building where demolition by explosion is not possible. The building of height up to 300ft can be demolished by this type of machine. High reach excavators can be used for different use by doing some attachments such as:

  • Excavators with shear attachments - excavators with shear attachments.
  • Hydraulic hammers - Hydraulic hammers and remove steel reinforcement.

  Explosive Demolition Method for Building Structures

Implosion Method of Building Demolition

Implosion is the process of demolition of a building using explosives. If the supports of the building are removed, the structure collapses. Using implosion technique, the main supports of the buildings such as column’s, beams and slab are fixed with explosives. When these explosives are detonated, the column collapse and so is the structure. Depending how the structure falls, there are two types of implosion:

  a) Falling like a tree

In this type of implosion, the building is made to fall like a tree to the sideward. This is the commonly used type of implosion. When free space is available besides the building, this type of demolition is prescribed. If the free space is available on the left side of the building, the explosives are set on the lower level of the building on the left side columns. As the explosives are detonated, the columns bursts, the building tends to falls towards the left side. Steel cables are tied to the building to control the falling direction of the building.

b) Falling into its own footprint

When the free spaces are not available around the building and the structure around the building are to be protected. This type of demolition is used. In this type of demolition, explosives are set in the floor below the middle part of the building.

These explosives are to be heavy as the explosion must demolish the building at once. If one part blast and followed by another. Then the building falls towards the first blasted part. So only less companies in the world are experienced in this type of demolition. As the explosions are detonated, the upper part of building destroys and falls upon the lower building. Due to the heavy load and force the lower part of the building also collapses and falls on its own footprint.


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