Why is it so??

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Originally Posted by 42rangie

Over here we call them "sheeps' foot tampers." The spikes concentrates the weight of the roller, increasing the compression of the fill before the next layer of fill is put on top. Makes for a more stable build up of earth.

Les

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There are sheeps foot rollers and pad foot rollers. Sheeps foot are drawn and pad foot can be drawn or self-propelled. A sheeps foot is a small circle of steel on the end of a pedestal and a pad foot is a rectangle of steel. Pad foot are usually (almost always) vibrating, and sheeps foot always static. Both are used for compacting heavy clay or puggy fill and should not be used for any other purpose. However poverty stricken or lousy contractors being what they are, machines are frequently used incorrectly simply because it is what they have and won't or can't pay to have the right machine on the job. False economy if the site engineer declares the compaction not the required standard and orders it all ripped out and done again properly this time.

why do super market trolleys have the 4 wheel steering? On a perfectly flat surface they are bearable but in the sloped car parks they become pigs. No wonder so many cars are dented and scratched !.

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Originally Posted by trog

why do super market trolleys have the 4 wheel steering? On a perfectly flat surface they are bearable but in the sloped car parks they become pigs. No wonder so many cars are dented and scratched !.

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That really ****ed me off when I was in Aussie years ago. Especially trying to hold them straight going across a ramp.

The supermarket trolleys in NZ have had locked straight rear wheels for at least 20 years now. It cost the more to buy 4 swivelling wheels than 2 swivelling and 2 locked.:(