(57) The present invention relates to an extension arrangement for piles (1,2) which are
to be driven into the ground, wherein the upper end (3) of a lower pile (1) and the
lower end (13) of an upper pile (2) are interconnected by a separate interconnecting
portion (6) arranged axially at the ends (3,13) of said piles (1,2). Said interconnecting
portion (6) is dimensioned to have such a fit that the lateral surfaces thereof will
drift apart, due to a change in temperature, radially from the lateral surfaces of
a counter-portion (3,13) which is axially in an overlying position therewith and connects
thereto, while said lateral surfaces in a normal temperature, correspondingly, will
press against each other. The present invention further relates to a method for extending
piles (1,2) wherein the extension comprises outer and inner interconnecting portions
(6;3,13) which are pushed into an overlying disposition. By means of a temperature
difference said outer interconnecting portion (6) is expanded to be larger than said
inner interconnecting portion (3,13), after which said outer (6) and said inner (3,13)
interconnecting portions ar brought to move into said overlying position while the
fitting clearance so provided prevails and then to clamp together in normal temperature.
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