Step 1: Materials & Sizes
I suggest to use Redwood.
Item Size Qty
Post 4x4x8 4
Rafter 2x4x10 7
Beam 2x6x12 2
Hex Bolt 4x1/2 8
Washer 1/2 16
Nut 1/2 8
Cement Mix 60 lb 4
BEHR Premium Transparent Weatherproofing Wood Finish 1 Gal 1
Nails 16d 3 1/2 14
Step 2: Cutting
Notch rafters at each side of 2x4"x10' rafters, 12inches inside and 1.5 inches width with 1 3/4 depth, this notch will be used to sit on 2x6 Beam.
Notch beams 2x6"x12', notches starting 12" from sides and 20inches apart, with 1.5 inches width with 1 inch depth. basically rafters will sit into beams and notches will be nailed. you can clamp 2 of the together and cut at one shot.
each posts needs to be cut a place for beams to sit on. 1.5 inches deep and 5.5 inches length, pictures will give you better idea.
i used hand circular saw (see picture) and jig saw, it depend how expert are you using these tools, but it is little bit hard. To empty the notch basically i cut the marked lines 1.5 inch apart first then start drill a hole and cut the remaining with jigsaw then clean the surface with circular saw. Fun right!
Step 3: Putting Protective Coat on Woods
Step 4: Digging the Post Holes
Dad helped me on this one!
Step 5: Bolt
Then Clamp both sides of beam and posts. mark 2 points on each post 1.5 inch from side for drilling then drill a 1/2 inch hole. Use your bolt and 2 washer each sides and the nut to tighten (don't over-tight, washer will penetrate into the wood). then open the clamps. do the same thing for all posts.
you will have something similar in the picture.
Step 6: Assembly
Step 7: Pour Concrete
Now mix water and cement and pour into the holes, no magic.
Step 8: Nail the Rafters
Next day when concrete is dry, nail the rafters from top into the notches, i used 16d nails 3 1/2 inches. drill a pilot hole and then hammer it.
it is ready to bring Grape vine branches on top of it.
Good luck and have fun.