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Tuesday, August 20, 2019 Demolition Equipment/Hydraulic

Demolition Equipment/Hydraulic

DARDA

 

Man has always used the forces of nature to disintegrate rocks or reducethem in size. Typically, he would drill a hole in the rock, fill it with water and let it freeze, causing the rock to split. Alternatively, he would drive in wooden wedges and saturate them with water, causing them to swell and split the rock.

 

Even today, these age-old methods are still used in quarries in many countries throughout the world. They no longer conform, however, to modern demands for economical working practices, increased productivity, the use of automation and improvements in working conditions. The discovery of explosives and, much later, the development of pneumatic demolition machines represented a considerable advance in this field.

 

However, the costs entailed by these methods have risen steeply in recent decades while the use of explosives is very often prohibited entirely.

 

The invention of hydraulic demolition machines brought further progress.

The use of hydraulic power, combined with new ideas and materials, made it possible to improve cost efficiency and working methods.

Darda rock and concrete splitters, developed in 1962, introduced a demolition technique of exceptional efficiency and versatility.

 

Hydraulic splitting means controlled splitting, and this method eliminates shock waves, vibrations, dust and noise that large impact tools usually produce. DARDA rock and concrete splitters have been used with great success in over 80 countries.

 

Conventional demolition techniques destroyrock and concrete by using an external force. However, because of their compressive strength, these materials are highly resistant to impact forces. For optimum results, one should adopt a splitting technique that works from the inside of the material, because rock and concrete have a lower tensile strength.

   

 The DARDA hydraulic splitters were developed to do just this and work according to a safe and proven wedge principle. First of all, a hole is drilled to a specified diameter and depth using an ordinary rock drill.

Then the wedge set is inserted into the hole with the wedge in a retracted position. The hydraulic pressure then forces the wedge between the two counter wedges, pressing them against the walls of the drilled hole. The effective splitting force of up to 413 tons or 4048 kN breaks concrete and rock from the inside, breaking thinner iron rods at the same time.