Bailey Bridge Military use q345b steel easy launching delaunching
Bailey bridges are built on site from a pre-engineered system of
ready-to-assemble components. Utilizing standardized prefabricated
components, Bailey bridges can be built to match a wide range of
vehicular bridging applications. Because of their excellent
versatility and overall value, thousands of Bailey bridges have
been installed throughout the world.
It is easy to install. Each part of the Bailey bridge is a standard
machine made piece and is interchangeable among spans. Inmost
cases, no heavy equipment is required to assemble or launch a
Bailey bridge; only basic pioneer skills and equipment are needed.
It is highly mobile. All parts of the bridge can be transported to
and from the bridge site by 5-ton dump trucks and trailers.
It is versatile. Standard parts can be used to assemble seven
standard truss designs for efficient single spans up to 210 feet
long and to build panel crib piers sup porting longer bridges. With
minor non standard modifications, the expedient uses of bridge
parts are limited only by the user’s imagination.
Transverse floor beams, called transoms, are clamped to the bottom
chords of the trusses and support stringers and decking. Sway
braces between the girders provide horizontal bracing; rakers
between the trusses and transoms keep the trusses upright; and
bracing frames and tie plates between the trusses provide lateral
bracing within each girder.
The main girders on each side of the center line of the bridge can
be assembled from a single truss or from two or three trusses side
by side. For greater strength, a second story of panels can be
added to the trusses. The upper stories are bolted to the top chord
of the lower story. For greatest strength, a third story is added.
A single-truss, double-or triple story bridge is never assembled
because it would be unstable. All triple-story bridges with the
deck in the bottom story are braced at the top by transoms and sway
braces which are fastened to overhead-bracing supports bolted to
the top chords.
Materials and Finishes
Most load-bearing components use low-alloy, high-tensile Q345B
steel. Excellent corrosion resistance is achieved with an inorganic
zinc silicate coating. Final color is lusterless light green. Hot
dipped galvanized is also available.
The clear roadway between curbs, called rib bands, is 12 feet 6
inches wide. The transoms supporting the roadway are normally set
on the bottom chords of the bottom story. Foot walks can be carried
on the transoms outside of the main trusses on each side of the
End posts pinned to the end of each truss sit on cylindrical
bearings which rest on a steel base plate. On soft soil, timber
grillage is used under the base plates to distribute the load. The
bridge can be assembled between banks of different elevations, but
the slope should not exceed 30 to 1.
Bailey bridge components can be assembled in seven different
configurations to efficiently accommodate a wide range of span and
capacity requirements. Panels, the primary Bailey components, are
pinned together at the job site to make girders of any length.
Various girder strengths are achieved by assembling either a single
row of panels, or two or three rows side-by-side. Panels may also
be stacked in double-story height for further increase strength.
For greatest strength, longer spans may be chord-reinforced.
Load and Spans
|Load, Span, and Bridge Type|
|Note Bridge type is as follows:|
"SS" indicates Single row Single storey;
"DS" indicates Double row Single storey;
"TS" indicates Triple row Single storey;
"DD" indicates Double row Double storey;
"TD" indicates Triple row Double storey;
"R" indicates Reinforced.