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Filling Coffer Dams
Javeler's 150 hp submersible agitator dredge pump is
being used in Costa Rica to fill coffer dams. Sand from the sea floor
is being pumped into coffer dam.
Javeler
Construction at work on Hylebos waterway
Dredgers in, poisons out....
"Along the bank of the Hylebos Waterway in Tacoma, Washington 32,000 cubic yards of
contaminated
sediment is being removed and treated, including some of the most dangerous chemicals in
the Commencement Bay.
Javeler was selected as the preferred contractor due to our 20+ years of experience
dredging with the Toyo submersible dredge pumps. The Toyo submersible dredge pump was
specified as the preferred method of dredging due to the limited turbidity created when
dredging as well as the high solids content when submerged in material. The treatment
costs are considerable, so the focus is dredging at the highest solids content possible.
Material is being pumped 2,000 feet to a treatment/dewatering process. The sediment
is then trucked to a disposal site.
Javeler is using a Manson derrick where a Toyo 8 inch submersible agitator dredge pump is
hung from
a crane. A Trimble GPS system is mounted on the end of the crane to control
the dredge pump location. A Trimble depth sensor provides accurate depth
measurement. A magnetic flow meter/density meter provides percent solids and
production numbers. An electronic tide gauge corrects for tides. All info is
sent to the laptop computer in the operators cab. A Trimble dredge software package
takes all the data and displays live readouts/contours/3D visualization of what we are
doing under water. Progress surveys are completed on a regular basis
with multibeam dual frequency GPS equipment to confirm dredging results. "
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Dredging To New Depths
One of our clients was working on a tension leg platform (TLP) drilling
rig 150 miles offshore in the
Gulf of Mexico and came to Javeler looking for a dredging system to remove mud inside of
7' diameter anchor piles in 4700 feet of water.
We modified a standard Toyo hydraulic submersible agitator pump with the addition of
accumulators filled with oil for pressure equalization. Javeler designed and fabricated an
independent support structure that was positioned on top of the pile. A hydraulic winch on
the structure lowered the pump down 20' inside the pile and excavated the sediment. The
slurry was discharged just outside the pile. A hydraulic jet pump, also on the structure,
provided flow to the jet ring on the Toyo dredge pump to assist in cleaning the inside of
the pile. All equipment was run hydraulically from a ROV.
 
 
Jetty
Construction for Beach & Channel Preservation
A Toyo DP-150B is being used for Jetty Construction in New Jersey.
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OC
Fisher Dam Dredging Project
Javeler's dredging system excavating sediment from the face of a dam in
San Angelo, Texas. This joint venture with Stolt Comex Seaway, used
a TOYO 10inch pump hung from a 40 ton crane mounted on a flexifloat barge. Pumped
into a 10 x 10 booster then through 4,300 feet of high density polyethylene pipe to
disposal site.
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Hydraulic
Dredging from Shore
Javeler removed 500,000 yards of material to create a marina and
waterfront development in South Texas.
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Need to Dredge in Tight
Spaces!!!!
Javeler designed and supplied an 8 inch submersible agitator dredge
pump system to a marine contractor on a new bridge construction
project on the Mississippi river. Sand and silt down to minus 45
feet was dredged and disposed outside the coffer dam. Due to the
tight constraints of the job and to minimize on site problems the
jet hose and dredge pump electrical cable were contained inside
small diameter pipes mounted on either side of the main 8" discharge
line.
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Bridge Construction - Dredge Sand Inside Caisson
A 75 horsepower submersible agitator dredge pump was used
to dredge out sand from inside 15 foot diameter caissons on a bridge
construction project on the Mississippi river. The 8 inch pump was hung
from a crane and removed sand down to minus 20'. Heavy slurry was pumped up
through 60' of steel pipe and discharged over the side. Compared to clam
shell excavation, the hydraulic dredging method increased production, was
quieter and had a much lower risk of injury or damage.
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Coffer Dam
Excavation
Dredged out a coffer dam at 80 foot depth using a TOYO
8 inch system.
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Pump in a box - Dredging in South Texas
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