Le silence a régné dans la cour du château en 2020 en raison des contraintes sanitaires.
Espérons que la fête de Mézerville aura lieu en 2021 et que l’Association NAMUKA pourra nous proposer un spectacle !

A pile-driver

A pile-driver

The principle is to lift a controlled metallic mass and to let it free fall on the pile, itself controlled by the same vertical structure. A winch with a big wheel lifts the mass using a jointed hook; a traction on the end of the hook lever causes it to topple over and liberates the metallic mass.

Since the 18th century the ground resistance and therefore the pile bearing can be estimated by measuring the parameters of impact (height of fall, penetration of the pile).

The incident energy on the pile is given by: MGH. (M.: falling mass, G.: gravitational acceleration, H.: height of fall). This energy gives a pile penetration to the value of E.
The incident energy imparted to the ground is given by: P.E. with P. assimilated to the ground resistance and so the pile bearing.

Experimentally, we achieved, for a 25 cm diameter pile with a 100 kg mass and a 2 m. height of fall on a hard ground, a 1 cm. penetration, and thus a 20 tons potential bearing!

M.G.H. = P.E. gives P = M.G.H./E.

It was however advised to use a security ratio of 1/2 on these results.

In the 1st century B. C., Vitruvius, the Roman architect described foundations on piles as follows: “If we could not find the right ground, and the place was only boggy ground, the alder or oak piles, a little bit burnt, should be driven by the machines very close to each other, then the spaces between could be filled with coal so that a very strong stonework could be built.”

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