Substituting microtunnel installation
of HOBAS jacking pipes for open cut construction has benefited
everyone on the Maxey Rd. Pump Station project in Houston. Of the
two miles of new interceptor lines required, nearly 4000 ft. of
24", 30" and 36" pipes were switched with the
City's approval. The completed project reverses the sewage flow to
an improved treatment site.
Off -
Setting Costs
Although the project was designed for open cut installation, the
City indicated other methods would be considered acceptable. With
this knowledge, successful bidder BRH Garver of Houston planned to
microtunnel the deep cuts (25 to 35 ft.). The higher pipe cost and
more expensive equipment cost was off-set by other construction
savings including:
- Elimination of continuous
sheeting.
- Reduction of spoil haul away and
disposal.
- Less cement-stabilized sand
backfill and street repaving.
- This cost balancing allowed
Garver to offer this "community friendly"
installation method to the City at no extra cost.
HOBAS Most
Reliable
Garver selected HOBAS jacking pipes for several reasons including:
- Lower jacking loads required due
to the dimensional consistency and smooth exterior.
- Highest reliability because of
the square ends, resilient material and consistent high
strength.
These benefits result in operational
flexibility and lower risk. With most of the pipe installed,
typical jacking loads on drives of + 300 ft. have been 25 to 50
tons. As in the past, the pipe installation was trouble-free. The
completed lines were air tested to assure their integrity.
Benefits
to All
The HOBAS pipe-microtunnel substitution provided many benefits to
everyone including:
City of
Houston:
- Superior sewer.
- Less cutting and patching of
streets.
- Reduced wear on streets.
Community:
- Fewer detours during
construction
- Less disruption and noise.
BRH Garver:
Specify microtunnel installation and
HOBAS pipes on your next project to receive these benefits in your
community.
