PILING.
75
without a top—that side being reckoned the top which cornes uppermost
when the box is laid flat on the ground. The sides of the mould are well
soaped or oiled to prevent adhesion ; then a layer of concrete is deposited in
the bottom to the extent of the outermost covering of the metal: that is to
Wire Mesh
Kigs. 69. —Chenoweth Pile.
say, 1 or 2 inches, as the case may be. This is very carefully rammed and
consolidated before the metal framework is laid upon it. The latter opeiation
requires great care. The framework must be set perfectly true to the axis of
the pile, and the shoe, with its bevelled sides, must be accurately adjusted
and brought into close contact with the ends of the frame. The box is then
carefully filled with concrete in a series of thin layers, deposited without a