7.
276
the embankment.
settlement, notably in the north-east abutment, which the
Chief Resident Engineer stated had settled to the extent
It is completed. There has been some
of 1-1/2". A crack developed in the north-east arch and
fine cracks in the other two arches. The Chief Resident
Engineer stated that the former had not reopened since
being grouted up a couple of weeks proviously,
A boring sùich we have bad taken at this bridge shows
that the bard ground is at a lepth of about 31 feet below
the existing round level and we therefore repart this
bride as a subject for careful and systezatic obser`ntion,
especially as some of the foundations are mainly constractei
of line concrate,
No. 13. This bridge is over the Tai Wai River. It con-
tains four 30 foot spans (granite arches).
It is 000-
pleted, but the embankment has not reached it at either
end. We are informed by the Chief Resilent Engineer that
it is founded on hard sravel and togt ng settlement has
taken place up to the present. Two boringe which we have
had taken reached a depth of 17 fast, passing through good
material, chiefly composed of gravel and stiff blue clay. In view of this, we see no reason for any apprehension in
this case.
Pine Culverts. There are two-pipe culverts beyond No. 13 Bridge which were completed in realiness for the en ankpent
to be tipped on top of ther. They are surrounded with
cement concrete, 4" thick, which we consider to ne insufficient. le recommend that they be strengthened before
the eabankment is formed but, in the absence of information
as to the nature of the ground on which they rest,
we are unable to say definitely of what this should
!