Civil engineer guide to fighting positions, shelters, obstacles

AFH 10-222 Volume 14 1 August 2008 96
4.5.5.2.3. Removable Posts. Removable posts can be set in a prefabricated
concrete base constructed under the road (Figure 4.23). Steel posts, such as
heavy-walled, 6-inch diameter pipes or steel I-beams approximately 7 feet
long, can be used. A 30-inch long steel pipe sleeve is constructed into the
base and slightly recessed from the top. The inside diameter of the sleeve
should be just large enough to accommodate the posts. The number of rows
and spacing may depend upon the availability of time, materials, threat, and
location. Pipes can be filled with concrete for additional strength. Stagger the
sleeves as indicated, maintaining 4 to 5 feet between posts and 18 inches to
the front and back of each row. Keep rows about 10 feet apart. Cover the
sleeves when not in use to keep out debris. When required, remove the covers
and drop the posts into place (heavy equipment may be needed). Lift handles
can be welded to the posts for easy removal, and concertina wire can be
strung throughout the rows to complicate removal by enemy forces.
Figure 4.23. Removable Posts.