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Bolt Template

The bolt template is made from steel in order to support the weight of the bolts. The template must have the Center Lines scribed into it in order to place it into the correct position.

The template is clamped onto aluminium formwork beams. The beams are secured onto the formwork shutter with a timber and Z-Bar holding-down assembly.

The center of the bolts was marked onto each side of the forms and a string line was stretched across.

Then we used either a plumb bob, or spirit level to align the string line with the scribed centers on the template.

Doing this positions the bolts pretty close, but not close enough for a mining job. Later surveyors will come and check the bolt centers and each bolt position.

The total weight of the bolts is 480 kg. It is essential to get the assembly positioned as close as possible so that it makes it easier to lever into a spot-on position with the surveyer.

The Bolts

For safety reasons, we found it necessary to lift these bolts in one at a time with a crane.

Tolerance Tubes

After the bolts are in, polystyrene Tolerance Tubes must be added to the bottom of the bolts at the correct height. The height was established and scribed onto the formwork shutter, then transferred onto the bolts with a spirit level.

Adding the Shear Key and Bottom Template

The Shear Key was added next. After that the bottom template made from form ply was added.

A hanging assembly made with timber and z-Bars was used. The Z-Bars were used to wind the Shear Key up until it buts up tightly into the Spreader Bar timber holding it firmly in position.

The Z-Bars are also used to “Crack’ the Shear Key after the concrete is poured. Crack the Shear Key while the concrete is soft (Don’t wait till the next day).

Concrete Finished

One down, 7582 to go Personally, I’d rather be fishing.

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Four concrete forms held together with Column-Clamps and held down with spaghetti nailed plywood. The 700 mm long bolts took a bit of work to cast in due to the extra reinforcement steel positioned exactly in the center of the pedestal.

Pedestal Formwork Ready For Concrete

This job was not as bad as the nightmare pedestal, but still took extra time because the formworkers had to reposition the steel in order to fit the bolts in.

Concretors Anthony and Nev Vibrating Pedestal Concrete

To ensure the correct heights, the concrete and bolt-top heights were established from a known benchmark with a Laser Level instrument and not by just measuring up from the foundation concrete.

Four Bolts along with plus-shaped (+) blockout.

Pedestal Formwork

Pedestal Formwork

Pedestal Reinforcement Steel