Las Vegas Waste Water Plant Case Studies
If a primary manifold at a water treatment plant for a large city fails
or has to be shut down, it can mean significant water supply problems
for a large population of people. Employees of the BNR Waste Water Treatment
Plant, serving the City of Las Vegas, were facing such a crisis. After
employing temporary measures to stop foundation settlement damage to a
primary manifold, they contacted Ram Jack Las Vegas for a permanent solution.
SITUATION
The primary manifold at the BNR influent pumping station in Las Vegas,
part of the Water Pollution Control Facility, had settled several inches
since its original construction. Associated with waste water being collected
by the city sewer system, soil expansion and contraction likely exacerbated
the problem, which was in need of rapid repair to prevent severe water
treatment issues.
PROPOSED SOLUTION
Working with HDR Engineering and the City of Las Vegas, Ram Jack Las Vegas
professionals proposed the use of five W12x30 wide flange beams and nine
helical piles to lift and support the foundation. Each of the nine helical
piles would be installed through cored holes in the existing pavement
under the manifold system. The primary beam would be supported by five
helical piles and would support four perpendicular beams and four valves.
The perpendicular beams would support the 42 in. diameter header pipe.
The helical piles would be used to lift and stabilize the foundation for
the primary manifold.
OUTCOME
Because of the need to maintain the water treatment process during the
repair, Ram Jack Las Vegas worked at night, allowing for slowing of the
system if there was a leak or problem. An 11,000 lb. mini-excavator was
used to work above and around the manifold. After coring the pavement,
the 2 in. helical piles with beam brackets were installed according to
plan, reaching an average depth of 35 ft. Jack hammers were needed to
penetrate a tough layer of soil about five feet deep during helical pile
installation. The beams were placed and support systems installed. When
finished the foundation was lifted 2.5 in. for maximum practical recovery
and to provide maximum support for the primary manifold. No leaks were
noted at any joints or welds in the water system. The City of Las Vegas
and HDR engineers were completely satisfied with the job performed and
relieved the job was completed without damage to the water treatment system.
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