JET
Jet grouting is an in-situ construction technique used
to improve the mechanical characteristics of a soil. The
technique is used in situations where increased stability
and bearing capacity or decreased permeability is
required. Because of its design flexibility, jet grouting
is an important alternative to more traditional grouting
methods, slurry walls, mechanical underpinning
systems, micropiles, or ground freezing.
The desired bearing capacity and permeability are
pre-determined which determine the grout makeup
and zone of treatment. High pressure is applied forcing
neat cement or cement/bentonite stabilizer through
a rotating jetting nozzle. As the nozzle is raised, the
stream of grout destroys the soil matrix and creates a
column of soil and cement. The jetting parameters of
flow rate, pressure, retraction rate and rotation speed
are determined by the energy required to create the
column with the desired properties, and are closely
controlled. An electronic recorder documents information
for each hole. The Compu-Grout System, a real
time integrated process to control and monitor the
operation is also available.
The Judy Company offers
single and double fluid grouting:
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Single Fluid: A stabilizer fluid, usually neat cement or cement/
bentonite, is injected into the in-situ soil at high pressure and velocity, producing a homogeneous, high-strength column.
In Granular
Column diam: 2’-3’ soilcrete strength 1000-3000 psi
In Clay
Column diam: 2’-3’ soilcrete strength 250-1000 psi
Double Fluid: compressed air is injected through its own nozzle simultaneous with the neat cement spray but with the cement sprayed at a lower pressure than with the Single Fluid method, allowing larger diameter,
in-situ columns to be created.
In Granular
Column diam.: 3’-6’ soilcrete strength 500-2000 psi
In Clay
Column diam.: 3’-5’ soilcrete strength
150-1000 psi
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Advantages
• Applicable in a wide range of soils from
granular to cohesive
• Rapid, effective, and cost saving alternative
to other grout injection methods
• Strength and permeability are predetermined
• Small hole diameter allows process under
existing buildings, in confined spaces,
around utilities
• Little or no disruption of facility operations-
Grout can be pumped great distances, keeping
equipment and noise away from treated areas
• Maintenance free
• Structural, and geometric design flexibility
Applications
• Cutoff walls or seepage barriers in
permeable soils
• Soil consolidation for tunnel roofs
• Excavation shoring
• Soil stabilization
• Underpinning
• Ground water control
• Environmental remediation
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Morris Shepard Dam
Near Mineral Wells, Texas. Leaking dam toe.
Rocky Mountain Dams
Rocky Mountain, Georgia. Foundation repair of seven dams.
Milwaukee
Harbor
Rehabilitation of marine breakwater.
Cedar
Lake Dam
Dam repair after catastrophic failure.
Twin Buttes Dam
San Angelo, Texas. Foundation grouting.
Red Rock Dam
Pella Iowa, major grouting contract filling solution channels in gypsum.
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