TM 5-5420-280-10
0019 00
BRIDGE OPERATION (Contd)
2. Required Conditions for Bridge Crossing.
NOTE
The REB has a Class 30 normal crossing capability and
a Class 40 caution crossing capability.
a.
Vehicle spacing criteria:
Rating:
Normal Crossing -- One vehicle only on bridge
Caution Crossing -- One vehicle only on bridge
b.
Maximum speeds for normal crossings:
NOTE
The maximum crossing speed is the maximum speed at
which a vehicle can safely come to an abrupt stop on
the bridge while crossing.
Rating:
Class 0 to Class 30 -- 25 mph maximum
Class 30 to Class 40 -- 10 mph maximum
c.
If bridge will be crossed under unusual operating conditions such as in
rain or high wind conditions, refer to Operation Under Unusual
Conditions, WP 0025 00, prior to approving bridge safe for crossing.
d.
The bridge may be emplaced over a gap no wider than 42.6 ft (13 m).
When crossing the REB emplaced over a gap either at or near 42.6 ft
(13 m), the NCOIC must observe the condition of both near and far shores
both during and after each vehicle crossing. Should the footing under any
ramp end of bridge settle unevenly or become loose or appear to be
breaking away at the edge of the shore, all vehicle crossing must be
stopped immediately until the condition is corrected. Refer to Site
Requirements and Layouts, WP 0012 00.
e.
During periods of heavy traffic, shores may start to erode under ramp ends
of bridge. The anchorage system (anchoring straps) must be periodically
adjusted to keep bridge movement and subsequent erosion to a minimum.
If erosion becomes significant, the bridge should be raised and sand bags
or other suitable fill material should be placed under its ramp ends. The
ramp ends should be lowered and securely anchored prior to resuming
vehicle crossing. WP 0018 00.
0019 00-3
