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Monday 16th May. The rock crusher which had been set up at the quarry is now crushing rock which will provide the aggregate and sand needed for the Jetty, Slipway and Hill of Difficulty projects.

Rock blasted from the side of a hill at John Adams Ground is first split into smaller  pieces, about the size of a soccer ball, before being fed into the rock crusher.  

Rocks being split into smaller pieces by a hydraulic rock splitter

 

The rock crusher is in two sections. The first section crushes the soccer ball sized rocks into sizes no larger than about 2 inches (50mm).  The crushed pieces fall onto a conveyer belt which takes it onto the second section into which the rocks are finally  crushed into yet smaller sizes. Through a series of grills or meshes  the various rock sizes are separated  and travels along conveyer belts out to where the aggregate and sand falls into its own heap on the ground. 

 

Two-sectioned rock crusher. First section is on the left.

Today, we saw the largest and most spectacular blasting of rock to date where 87 sticks of dynamite was used. The photo below was snapped just fractions of a second after the blast. Note the rock flying in the air.

 

Rock blasting at the quarry.

 

Pile driving has begun at the Landing in which  8 meter long steel piles are being  driven into the sea bed  forming  what is called a sacrificial boxing. Concrete will later to be poured into the boxing forming a solid 600mm (2 feet) wall around the seaward and enterence-to-the-harbour end of the deteriorating jetty. 

Steel piles being driven into the seabed by a large pile driver.

 

Workers creating a large reinforcing mesh

 

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