Ram Jack Works With MDOT to Support Bridge Case Studies
The supporting piles of a bridge in Pearlington, Mississippi were decaying,
spelling disaster if the MDOT had not called in the experts at Ram Jack
Southern Mississippi quickly.
During a routine inspection of Mississippi’s Bridge SR604 4.6, timber
piles exposed significant decay. This decay affected four of the timber
piles supporting the bridge. MDOT bridge inspection engineers found the
decay reached 30% to 45% on the piles and asked Ram Jack Southern Mississippi
to examine the situation and provide them with an engineered solution
to repair the Pearlington bridge.
Ram Jack Engineering reviewed the conditions of the problem and compiled
a plan to alleviate the loads on the decayed timber piles. The plan was
to be achieved by installing four Ram Jack 2.875 in. dia. 10”/12”
helical piles with threaded connections and side-load brackets with 3.5x10-0”
external sleeves. Installation was to be completed with a minimum torque
of 4,500 ft-lbs. to provide a maximum allowable capacity of 20 kips and
a safety factor of 2:1. This installation required demolition as well
as using saws to cut through an asphalt overlay and concrete deck. New
piles were to be installed next to the decayed timber piles and embedded
an estimated 35 feet to match the depth of the timber piles. Once the
installation was complete, the plan would be to form the bottom side of
the deck and dowel in with rebar before re-pouring with a Set 45 type
concrete on the deck. Finally, they would place a cold mix asphalt patch
to the existing grade, once again putting the bridge in working order.
Working efficiently, Ram Jack Southern Mississippi installed the four
new piles next to the decaying piles. The crew completed the work to specifications,
reaching 20 kip capacities per pile in only two days. This speed of work
minimized road closure for those using the Pearlington bridge. To help
this Mississippi community get back to normal traffic flows, the Ram Jack
crew took minimal downtime.
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