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Full text of "Modern Mechanical Engineering Vol-I"

FITTING  AND  ERECTING

249

and, after the grouting has been run in and has set, the wedges are withdrawn.
The use of wedges is a much quicker job than with parallel packers, but it
is obvious -that the contact of the wedge with the soleplate is more or less
a line contact, as compared with the surface contact obtained with parallel
packers, and it is therefore essential when using wedges that the soleplates
be grouted-in before any weight is put on.

Care should be taken in mixing up the grout to see that it is thin enough
to run easily under the bedplates;  it should have the consistency of very

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Fi£ 5 .—Bedplate in Position before Grouting-up, showing parallel packers with surface contact and
45                                                   wedges with line contact
i  Steel girders built in.   2, Parallel packers.   3, Wedges.   4, Top surface of foundation block,
'                                            left rough.    5, Grouting level.
thin cream, and should preferably be more liquid than otherwise. The
proportions of cement and sand used are as follows: one part by volume
(bucket or barrow) of cement, two parts fine sharp sand. Before groutmg-
up a dam of stiff cement, or of boards or bricks, should be built all round
the bedplate to a height of 2 or 3 in. higher than the finished level of the
erout and the surface of the concrete foundations should then be thoroughly
wetted with several bucketfuls of water, in order to prevent the water in
the grout being rapidly absorbed by the concrete foundations The grout-
nj material is then run in, and, when the surface of the liquid is above the
bottom of the soleplates, the grout should be well worked under by means
of a short length of thin, flat iron (hoop iron i in. X * m. thick does very