TM 104320-345-13
2-11. ASSEMBLY AND PREPARATION FOR USE - cont.
k. Install Roadway Crossing Guards. Refer to figure 2-27. If hoseline must be laid across a
roadway or railway, hose should be laid under existing bridge or through a culvert pipe where
possible. Hoseline must never be buried unprotected because compacting earth may collapse
hose and shifting rocks, sand and soil will gradually damage hose. If hoseline must cross a
railway, dig a tunnel beneath gravel of railbed and nail a plank to bottomof roadway crossing
guard. Location of the roadway crossing guards along the hoseline route must be determined
from the initial site survey
(1) Dig a trench (1) about 18 inches deep and 18 inches wide across road or railbed.
CAUTION
Remove stones and sharp rocks from trench before laying hose Rocks.
can cause hose damage and failure.
(2) If hose (2) is being run under a railroad bed, install planking (3) in tunnel before laying
hose Planking may also be used in roadway crossings to provide additional protection to
hose.
(3) Lay hose (2) in trench (1).
CAUTIONS
Roadway crossing guards are 5-feet long Guards must cover hose the
full width of roadway and should extend about 2-feet from each side of
roadway.
To prevent damage to hose, avoid sharp bends in hose where hose
enters crossing guard.
(4) Place roadway crossing guards (4) over hose (2) If planks (3) have been installed, nail
crossing guards to planks.
(5) Backfill trench (1) using dirt removed in step (1) Do not put any stones on of top of
roadway crossing guard (4) Fill trench one to two inches above original roadbed to allow
for compacting of soil.
2-56
