Figure 10-22.P1 pontoons on assembly angles
and started by hand to thread the FN1 nut (fig. 10-23).
The bolts should be snugly tightened, then backed off
about one turn.
Positioning Upper Angles
The second pair of assembly angles is placed on
the top of the pontoons and positioned and bolted in
Figure 10-23.Positioning of A6B bolt and FN1
nut to connect pontoon to assembly angle.
the same manner as the bottom pair of angles.
Spreader jacks, come-alongs, or heavy-duty pinch bars
can be used to align holes for the top angles.
After all of the A6B assembly bolts have been
installed, final tightening is accomplished with an
impact wrench or 48" ratchet wrench in those locations
where accessories or assembly plates are not bolted to
NOTE: The proper setting of A6B bolts requires
tightening to a 2,400-foot-pound torque. (The
applicable rule is to draw the bolt or nut up tight and
then add another half turn.)
FINAL ASSEMBLY OF STRING
CP1 chain plates, LA1 launching angles, or other
accessories that attach to the outer edge of the
particular structure under construction can be
installed on the string at this time, if desired. Strings,
requiring the addition of a launching angle, should be
so assembled on the way that the launching angle can
be installed on the top of the string. After installation
of the chain plates, the A6B assembly bolts that attach
the parts are tightened, and the chain plates or other
accessory items are welded, as required. KPl keeper
plates can be installed at this time in all locations for
which they are specified for the one string of the
structure being built. After all fittings are in place and
the assembly bolts tightened, the assembly should be
inspected for security of bolts and fittings. After the
first string has been launched, the same assembly
procedures are followed for assembly of the second and
additional strings, as applicable.
LAUNCHING A STRING
If the pontoon string has been assembled along the
edge of a dock, it can be tilted into the water by means
of jacks or a crane. If it has been assembled on a way,
the anchorage is released and the string is allowed to
glide head-on into the water. Note that adequate
freeboard will be required for this method of launching.
End launchings can be accomplished from flat or
nearly flat ways by pushing the string with a
bulldozier or pulling it with a tug or M-boats. Strings
also have been assembled inland and pulled to the
shoreline by a bulldozer. A line, secured to the string
before launching, should be made fast ashore to keep
the string from drifting away in either side launching