A gravel slab, two metal tubes, a brake cylinder and an arc welding station: it does not take more to make a stable and resistant parasol stand.
Essential element, the base of an umbrella must be chosen according to the weight of the structure (steel, aluminum or wood) and the size of its canvas cover.
The commercially available models for large umbrellas are cast iron or weighted with concrete. Depending on the material, the design, the presence or not of wheels... the price can exceed 200 €!
But with some elements of recovery, it is possible to realize a stable, solid and aesthetic foot for almost nothing!
Parasol lestage: what choice?
To stabilize the large sunshade presented here, the choice fell on a concrete slab 40 x 40 cm (4 cm) whose weight is around 15 kg.
Particularly resistant, it is pierced without difficulty to fix a metal tube in which to introduce the mast of the parasol.
This type of slab for driveways and terraces is available in trade or DIY superstores (GSB). Depending on its fineness of grain, its price varies from 2 to 7 € per unit.
It is therefore a most economical solution. Another option is to recover deck boards in a gasoline suitable for outdoor use (teak for example).
These blades make it possible to manufacture a box (square or rectangular according to the shape of the parasol), that it is enough to fill with mortar ready to use or concrete (1 volume of cement, 2 vol of sand and 3 vol. gravel). After complete drying, it is returned and drilled in the center for the support tube of the mast.
Make the support tube of the umbrella stand
The diameter of the galvanized pipe recovered here is too wide compared to that of the mast (Ø 47 mm). It is therefore necessary to line this tube (outer Ø 60 x 500 mm, inner Ø 55 mm, thickness 3 mm) with another inner Ø 50 x 470 mm and thickness. 2 mm thick.
For a perfect fit, it is cut along its length to the grinder. Then the lips are spread with a corner to fit the two tubes into each other, gaining the few millimeters missing to receive the mast without forcing.
The difference in length (3 cm) between the two tubes makes it possible to accommodate and weld a cylinder coming from a truck brake caliper piston (photo 2), but any other mechanical part of this type may be suitable.
Finally, a pressure screw - recovered on an office seat! - is installed on the tube to immobilize the mast.
Blend the main tube with another tube, split beforehand with the grinder. Slip them into each other at the mallet, placing a block of wood between them.
Retrieve a closed cylinder on one side (here a brake cylinder) that will be welded to the base of the support tube. Drill it in the center. Place a screw or threaded rod Ø 12 x 60 mm and weld it.
Place the cylinder in the main tube, the inner tube abutting. Fit the cylinder as a "plug" and weld the two pieces edge to edge. Grind and finish with lime.
Screw the lateral pressure screw into an M8 flange nut welded to the support tube with a Ø 10 mm hole. Before welding the nut, center it on the hole with a temporary screw.
Draw the diagonals to determine the center of the slab. Drill at slow speed with a Ø 12 mm concrete drill. Decrease the pressure as the drill passes through the material.
Cut out four blocks of 80 x 80 mm in a wooden chute (here teak, thickness 22 mm). Place a bead of glue-adhesive for heavy loads on the underside. Glue them to the four corners of the slab.
Put the holds in press. Insert the threaded rod of the support tube into the hole drilled in the slab. Place a large washer, nut, and tighten securely.
Screw the recovery knurled screw onto the support tube. The parasol's mast is introduced without forcing into its support. Tighten the set screw.
• The tube receiving the umbrella's mast is made of galvanized steel, which avoids painting it. But, in place of welds, to facilitate priming as soon as you approach the electrode of the metal, it is necessary to strip the support with a grinder equipped with a disc to deburr. Then protect the cold galvanized (GSB) special aerosol welds.
• The brake piston cylinder used here can be replaced by the thick sheet. 5 mm, cut with a grinder equipped with a disc for metals, and welded to the end of the support tube.