TM-5-5420-279-10
SBC-ton/ft2 (kN/m2)
Soil Description
Hardpan overlaying rock
12 (1290)
Very compact sandy gravel
10 (1075)
Loose gravel and sandy gravel, compact sand and gravelly sand, very
6 (645)
compact sand-inorganic silt soils
Hard, dry, consolidated clay
5 (537)
Loose coarse to medium sand, medium compact fine sand
4 (430)
Compact sand clay
3 (322)
Loose, fine sand, medium compact sand-inorganic silt soils
2 (215)
Firm or stiff clay
1.5 (161)
Loose, saturated sand-clay soils, medium soft clay
1 (107)
Construction Site: - Make sure the area can accommodate a normal construction site of
134 ft 6 in (41 m) by 49 ft 3 in (15 m) symmetrical about the bridge centerline.
Deployment is possible on sites that are more restricted but construction times are
increased due to the necessity for an increased number of positional changes to the
flatrack carrier vehicles to off-load the launch beam and bridge modules.
Local Weather Conditions: - Make sure the strength and direction of prevailing winds
will not hamper deployment or usage of the bridge. The deployment shall not commence
in wind speeds in excess of 35 mph (56 kph). Also make sure heavy rainfall will not cause
problems on the launch site or cause a rise in the water levels when crossing rivers,
streams etc.
1.2.12.1
Stand at a point on the home bank (point A) of the proposed bridge centerline and select
an object (point B) on the far bank (also positioned on the centerline). Point B is subject
to the restrictions set out in 1.2.11.3.
1.2.12.2
Use a compass and record the bearing of the selected object (point B) along the proposed
bridge centerline (the azimuth). Move up or down the home bank on a line at a right angle
(90 degrees) to the azimuth until point C is reached where the bearing of the selected
object (point B) equals the azimuth bearing plus or minus 45 degrees.
1.2.12.3
Use a tape to measure the distance between points A and C along the home bank (which
equals the distance between points A and B - the gap) to determine the gap dimension.
