OZ9S

Mast

First digging...

Building the iron-case. Made with 12mm and 10 mm iron (steel tender) and bounded together will steel wire.

Building the bottom (inside the concrete). Its 9 threaded rods welded together. The rods are 2 meters long each.
They are now placed at the bottom of the tower to secure that they are held in place 100% correct before welding together.

Building the bottom (inside the concrete). Its 9 threaded rods welded together

Digging... Now with a bigger machine.

Moving the iron case to the hole for test (is hole wide/deep enough?)

Iron case - into the hole (only to test if the hole is big enough)

Iron case - into the hole (only to test if the hole is big enough) - and NO, it was not...

A bit more digging is needed...

Digging... - and still "by hand"...

The surplus earth has been placed in a lower erea

Digging a hole 2,80 meter deep means that ground water can be seen (hole was made during June 2009, a dry period here)

Pumping up ground water

The first hand-made concrete in the hole

Day 2: The concrete placed yesterday is hard and will work for base for the 200 kg + 200 kg steel tender iron. We are making the hole in the center a bit bigger so the pump has better terms (and less mud)

The bucket and pump in place. The pump is pumping and will be removed just before the rest of the concrete will arrive the day after tomorrow. The buchet will stay...
Now the outer iron (200 kg of steel tender) has been inserted on the concrete made yesterday.

Now we insert the inner iron - which is 9 threaded rods welded together.

The inner iron fits perfectly (Hmm, good!!)...

Now more welding. Inner and outer iron are welded together so the 9 rods are held perfectly in place.

Welding....

Now its 400 kg of iron. Here we see the top with the 9 rods sticking up of the hole. The yellow tube to the left is from the pump, removing ground water from the bottom of the hole

Mounting iron spears for grounding

The red cable to the left is the ground cable from the tower to ground.

There is another ground spear for grounding to my shack - see the grey cable to the right...

Now we are also placing "cable trays" for coax's, 230 volts, rotator control cables, LAN-cable for camera etc.

Now working on the top of the concrete, building a wodden thing.

A bit more welding...

While working on the base of the tower, we did put together the lower 4 sections of the tower.

Finally, we receive the concrete (car number one)

Concrete delivery (car number two)

Concrete delivery (car number three)

Now almost done... At the pics you can see that we are vibrating the concrete with vibrators. In total: 16,5 m3 = 38.000 kg.

Making the finish on top - and almost done...

NOW DONE!!
In total: 16,5 m3 of concrete = approx. 38.000 kg.