Motor Truck Logging Methods: Engineering Experiment Station Series, Bulletin No. 12Knapp, Frederick Malcolm
Science
Motor Truck Logging Methods: Engineering Experiment Station Series, Bulletin No. 12
Knapp, Frederick Malcolm
Lumbering
At the present time this is not done and there are one or more ruts in
the surface of the road due to the rounding off of the poles where they
are placed side by side. The front wheels of the truck are constantly
dropping into these ruts, tending to spread the track apart and making
it harder for the driver to steer. The tires also suffer from uneven
wear. With this deep groove in the track, a certain amount of the
traction of the rear wheels is also lost. Hence a much better road would
be one with the inner faces of the poles hewn so that a tight fit is
secured.
This road can be built of two large poles or three smaller ones to give
a flat track two and a half feet wide for each wheel. Laid nearly flush
with the ground the guard rail can be eliminated with this width of
track, except on sharp curves and other locations where there would be
danger if the truck left the track. On such a road the traction will
also be increased, better time can be made, the truck will be easier to
steer and hence safer to operate, and there will be less wear on the
tires. Such a road can be very easily and cheaply built by bringing in a
portable sawmill and slabbing the material on two sides to the desired
face.
The life of a good pole road is from three to four years if kept in good
repair. The maintenance cost is very light if the road is properly
constructed in the first place, consisting chiefly in removing a pole
here and there that shows signs of too much wear, and in bracing guard
rails where they weaken. The use of two or three hewn poles laid
lengthwise for each wheel without cross-ties does not pay as the poles
soon get out of place even when trenched, and the loss of traction due
to the irregularities and of time and money in the upkeep of such a road
more than justifies putting in a good road in the first place.
The cost of a fore and aft pole road varies with the accessibility of
the material and the cost of the labor. In the past they have been built
for as low as $2000 a mile, but with the present prices costs will range
from $5000 to $7000 a mile. One company within the year contracted the
grading and construction of the road for $70 a hundred foot station, not
including the cost of clearing and chunking out the right of way. The
total cost was about $125 a station or $6600 a mile.
Some of the advantages of the pole road are that it is tough and strong
and does not crack, split or break easily so that if it is properly put
in it lasts and requires but little maintenance. The material for its
construction is found along the right of way and being small in diameter
is less expensive than other road materials.
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