It is normally a good idea - on solid ground - to more or less complete the sub deck frame, and raise it to finished position, securing with good screw clamps - before concreting the supports. In areas where the ground is not solid, the upright can be carefully concreted into position - sitting on a section of paving stone in the hole - before the deck frame is actually finalised and bolted into position.
Naturally you have to get the supports in exactly the right position before concrete is poured. They should also be allowed to full set, before trying to fix the sub frame deck base to them.
Once you are happy with the basic set up - the deck frame position can be enacted and bolted to the concreted supports.
On the frame in the image, there will be a cross member support beam affixed under the deck frame for added support and to lessen the span for the deckboards.
If you do the frame as per these images and pages, ensure that you have the space to maneuvered the cross member bearing into place. For most, it would be best to position the bearer whilst the frame is in the process of being made.
A bearer - either single or double beam is also a great help in the levelling of the deck frame. Bearers will require their own independent support posts to ensure strength and stability.
All metal fixing - screws, bolts or nails even, should be exterior grade which normally entails galvanised or zinc coating at source. this also includes and washers used in the project.
The screws in these images are for temporary fixing prior to galvanised coach bolts being used for the main supports.
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