Services
Concept to Completion Design-Build
AGI’s award-winning design-build solutions adds significant value. Our approach not only accelerates timelines and reduces costs for owners but also fosters innovation, collaboration, and synergy within the Project Design Team for the life cycle of the project.
Techniques
Cement Deep Soil Mixing (CDSM)
Cement Deep Soil Mixing (CDSM) is a ground improvement technique through blending a hardening agent (usually cement grout) with the native soils, in situ. The process improves the strength and stiffness of the soil to increase bearing capacity, decrease settlement, and mitigate seismic issues. Also used to form walls for excavation support, erosion control, or contamination barriers.
Installed by screwing the injection tool into the ground using a rotary hydraulic drill rig. Upon reaching the designed depth the stem is unscrewed and grout/concrete is pumped under pressure displacing the ground around serving to increase lateral stresses (friction interface) in the soils.

Displacement Grouted Columns (DGCs)
Displacement Grouted Columns (DGCs) provide both ground improvement and high capacity in a single deep foundation element. These columns are capable of achieving higher capacity than augercast or large-diameter bored piles, without generating all the spoils.
Installed by screwing the injection tool into the ground using a rotary hydraulic drill rig. Upon reaching the designed depth the stem is unscrewed and grout/concrete is pumped under pressure displacing the ground around serving to increase lateral stresses (friction interface) in the soils.

Stone Columns / Vibro Replacement
Stone Columns / Vibro Replacement is a technique particularly suitable to increase the density of granular soils and reinforce cohesive soils. Constructed by inserting a vibratory probe to design depth, filling the newly-created hole with crushed aggregate, and vibrating the crushed rock to increase its density and diameter as the probe is raised from the design depth toward the surface. Columns can be installed using either the Wet Method or the Dry Bottom Feed (DBF) method.
AGI’s patented equipment and processes help create the best stone columns in the industry.

Aggregate piers
Aggregate piers are vertical columns of compacted aggregate (gravel or crushed rock) installed to reinforce and stabilize soft or loose soils, increase bearing capacity, and control total and differential settlements. They are typically constructed by drilling or augering a hole, then filling it with crushed stone in layers and compacting each layer until the column reaches the ground surface.

Vibro Compaction
Vibro Compaction is the original method used to densify clean sands. It is still the world-wide preferred method.
Our team has extensive experience with the vibro-compaction technique and we have applied to numerous sites throughout the US particularly on sites where liquefaction potential is a concern.

Wick Drains
Wick Drains were developed primarily to speed up the consolidation of cohesive soils, they are installed on a regular grid pattern typically ranging from 3-feet to 6-feet on center depending on ground conditions. The drains accept water from the consolidating ground in the radial direction and transport it to the vertical direction relieving excess pore water pressure.

Compaction Grouting
Compaction Grouting densifies, strengthens, and stiffens soil, by displacement through expanded bulbs. The technology increases bearing capacity, decreases, arrests, or reverses settlement, stabilizes subsurface voids, and reduces seismic hazards.
Also known as Pressure Grouting, it involves the use of low slump, mortar-type grout pumped under pressure to densify loose and/or liquefiable soils by cavity displacement action.

High Capacity Helical Piles (HCHPs)
High Capacity Helical Piles (HCHPs) are an excellent, high capacity deep foundation element. Installation is fast and can be performed in limited access and low headroom conditions.
The pile is advanced by rotation and crowd forces only, without vibration. The process generates virtually no spoils. AGI has installed and tested HCHPs to capacities of over 1,000 kips. Great for contaminated sites!

Rapid Impact Compaction (RIC)
Rapid Impact Compaction (RIC) instantly compacts shallow soils with a high-energy tamper. Ideal for compaction of uncertified fills, and liquefiable soils with depths up to 25 ft.
RIC utilizes a hydraulic hammer, repeatedly striking a 5-foot-diameter compaction plate at a rate of approximately 40 to 50 blows/minute. Upon striking the plate, the energy transfers into the subgrade strata to induce densification. A predefined “set” criteria allows the operator to determine the effective maximization of energy as indicated by the degree of soil depression observed in response to the hammer blows.

Sheet Piling
Sheet Piling is generally used to create temporary and permanent walls providing excavation support and soil retention. Sheet Piles typically interlock with each other and are installed in a continuous sequence throughout the planned perimeter, forming a wall. Anchors can be installed simultaneously to provide additional lateral support where required.
