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BRIDGE OPERATION (Contd)
f. Shore erosion. During periods of heavy traffic, wave action may cause the shore
to erode under the approach ramp end of the bay. The end span anchorage system
(shore lines) must be taut to keep bridge movement and subsequent erosion to a
minimum. If erosion becomes significant, the ramp bay should be raised and sand
bags or other suitable fill material must be placed under ramp inner pontons. The
ramp bay should be lowered and securely anchored prior to vehicle crossing. This
condition can often be eliminated by adding an interior bay to the center of the
bridge, and pulling the ramps farther onto the shore.
g. Leakage. At three-hour intervals during heavy traffic, inspect the ponton bilges
for water by removing the bilge plugs from the roadway deck using T-wrench. If
more than 6 in. (15 cm) of water is discovered, pump it out as described in
WP 0053 00. If a hole is observed, monitor the bridge or rafts performance. If visual
evidence of taking on water is observed (such as riding low in water), pump the
water out while operations continue. If the water intake is faster than the pumping
capacity, remove and replace the damaged bay. The damaged bay is deadlined until
repairs are made.
h. Water debris. Do not allow debris to build up against upstream side of bridge.
Remove debris immediately to prevent damage to bridge.
Ensure all gravel, rocks, mud, and other debris are
removed from openings at unfolding stabilizer
mounting brackets prior to folding bay. Failure to
comply may cause jamming during folding operations.
i. Roadway debris. During periods of heavy traffic, dirt and foreign materials
may accumulate on roadway surface. Wash down roadway surface using pressure
pump as described in WP 0053 00.
END OF WORK PACKAGE