Building Demolition Services

Building Demolition is the tearing-down of buildings and other structures.Demolition contrasts with deconstruction, which involves taking a building apart while carefully preserving valuable elements for re-use. Service provider expertise in Dismantling, Razing, Destroying or wrecking any Building or Structure or any part of Building by pre-Planned and Controlled methods.

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Detailed Description for Building Demolition Services

Demolition is the tearing-down of buildings and other structures. Demolition contrasts with deconstruction, which involves taking a building apart while carefully preserving valuable elements for re-use.

For small buildings, such as houses, that are only two or three stories high, demolition is a rather simple process. The building is pulled down either manually or mechanically using large hydraulic equipment: elevated work platforms, cranes, excavators or bulldozers. 

Larger buildings may require the use of a wrecking ball, a heavy weight on a cable that is swung by a crane into the side of the buildings. Wrecking balls are especially effective against masonry, but are less easily controlled and often less efficient than other methods. Newer methods may use rotational hydraulic shears and silenced rock-breakers attached to excavators to cut or break through wood, steel, and concrete. The use of shears is especially common when flame cutting would be dangerous.



Necessity of demolition

•When the building is too old and cannot be put to further use

•Structural changes

•Development of the city

•Structural failure of the building


Methods used in demolition of various types of buildings


Bricks and masonry buildings


• Mortar breaks away very easily from the bricks, where bricks often remain in one piece and   thus are easily salvaged.

• Demolition by reverse order of construction.

• Building must be demolished by hand to wall plate level.

• Careful removal of members in tension must be done.

• After careful demolition the site should be 'back bladed' to ensure there are no pieces of bricks or concrete is left on the site.



Masonry and brick arches

• Care should be taken as there is a serious possibility of structural failure.

• Single span arches can be demolished by hand by carefully taking narrow strips, say 230mm wide, from the side parallel to the line of the edge of the bridge until only a narrow portion remains which can be easily be collapsed.

• Other method is


 –Spandrel infilling is removed down to the springing line

 –The arch rings are lifted out and removed

 –the abutments are demolished.


Steel frames and components

• Dismantling of roof trusses is done by the following procedure,

        The structure must be carefully braced temporarily.

        The roof claddings must be removed and lowered to ground.

        The truss must be supported by a suitable crane or roped up.

        If the span is more then the lifting might cause compressive load on the member therefore the member must be braced with heavy timber girders splinted along the component.

        The truss must be lowered to the ground and dismantled.


Bridges and gantries of steel construction

• The first stage of demolition for all the bridges is to remove the dead load of road metalling or railing tracks and ballast.

• Cutting points must be carefully chosen so that the ends cannot slide off the abutments.

• If crane lifting method is adapted then the entire structure can be lifted out to flat ground and then cut down to smaller parts


Reinforced Cast In-Situ Structures

• It is the most expensive sector of the demolition industry as the amount of salvageable materials is very low.

• Knowing the details of placement of reinforcements in the component through drawings is key step.

• Structural stability must be checked.


Suspended Reinforced concrete slabs

•Reinforced concrete slabs should be demolished by cutting with compressor guns, hydraulic busters and oxy-acetylene equipment, parallel to the line of main reinforcement, thus reducing the slab to small sections.

• When possible the cutting work must be carried out from an independent platform.

• Strip cut away should be no more than 300mm wide at one time.


Reinforced Concrete Beam

• All loads must be removed before demolishing the beams.

• Supporting rope must be fixed for each beam.

• Next the reinforcement must be cut at one end and that end lowered to the ground followed by the cutting the other end.


Reinforced concrete columns

• After removing all the superimposed load, two wire ropes must be fixed on to the top of the column to provide support.

• Then the reinforcing bar can be exposed near the base of the column using compressor guns .

• These must be cut in the opposite side of the column from the rope which has been selected for pulling.

• Then the column is pulled over.



Reinforced Concrete walls 

• Can be best dealt with by cutting them into manageable sections and then treating these as a series of columns.

Structure made of post-tensioned units 

• In fact when the load is removed by demolition, the beams can fail in an upward direction due to the forces inherent in the highly tensioned tendon.

• The following three methods have been postulated.

        Reach the tendons and hols them, then cut through the concrete to form small sections and gradually allow the tendons to take up a shorter path.

        Apply heat so that the tendons weaken and expand. This allows the concrete to be broken up progressively.

        In some places the tendons are held up in ducts created by spaces between the top and bottom flanges and the tendons form a cured outline. In such cases we can break the ducts and gradually allow the tendons to rise and take a shorter path, thus relieving the tensile stress.




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