As a matter of interest, what sort of drill would I need to drill the holes through the sleeper and wwould they be drilled at exact measurement of the peg diameter ?
The runners are the 2 lengths of timber running down the slope to support the slide.
I used a normal twist drill the same diameter as the curtain pole but you can get special drills such as a Forstner drill bit that gives clean cuts on bigger holes.
I'm.thinking about packing soil under the slide to support it or not - if the slide is at the right angle and height then I think the sleeper should hold the weight ?
I found something about steel screws to drill through the sleeper, would this be as effective as wooden pegs ?
Packing soil firmly under and around for support will probably be ok.
It depends on the steel screws. There are special ones that you can use into soil to anchor things but these are completely different to 'normal' steel screws.
To fixing railway sleepers landscaping screws can be used which are strong steel screws available up to 250mm in length with a hexagonal head and fixed using a power drill. These will screw right through a sleeper and fix into the one below. They need an extremely high force before they pull out so they make a really strong joint.
They are used when you are stacking sleepers and need to secure them to each other.
To anchor into soil you need something that is substantial and goes deep into the ground. Using wooden pegs, as I have suggested, is a good way of doing it and quite a common method. A lot of car parks in country areas use this method to put stop blocks down to prevent cars driving/reversing into surrounding bushes.
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