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Pressure Grouted Cased Micropiles

Micropiles are high-performance, high-capacity drilled and grouted piles with typical diameters of 5” to 12” utilizing high strength pressurized grout to transfer loads to competent bearing strata. The high strength grout produces high bond values to the surrounding soil and rock formations and protects the steel components from corrosion. The most common components are made up of high strength steel tendons and steel casing. Micropiles are designed to carry compressive, tensile and lateral loads achieving working loads of 30 to 300+ kips while conforming to seismic design requirements. Recent advancements in drilling technology allows micropiles to be drilled through almost any ground condition when conventional deep foundation systems like driven piles, drilled shafts, or augercast piling are unfeasible. Micropiles are installed with minimal vibration, noise, disturbance to surrounding structures. Micropiles are also used in retrofit and underpinning applications to strengthen or replace deteriorating foundations. MDS provides our clients “performance based” micropiles that meet or exceed design requirements resulting in escalated construction schedules and fewer change orders.

Grout Injection Hollow Bar Micropiles

Hollow bar micropiles enjoy the same benefits of pressure grouted cased micropiles and are accepted by the Federal Highway Administration (FHWA). Hollow bar micropiles are particularly suited to soils that are not conducive to open-hole drilling such as soft collapsible soils. High strength grout is pumped through the hollow bar, which also serves as the drill string, while exiting the tip of a sacrificial drill bit. The hollow bar is grouted in place and serves as the structural element. Hollow bar micropiles can be installed at any angle to provide additional support and structural loading.

Auger Cast In Place (ACIP and CFA)

Auger cast piles are installed by rotating a continuously flighted hollow shaft auger into the soil to a specified depth. High strength cement grout (3,000 to 5,000 psi) is pumped under pressure through the shaft as the auger is slowly withdrawn. Reinforcing steel is added per pile specifications. An auger cast pile is both end-bearing and friction-based. Pile diameters of 12” to 18” are typical, but larger piles are available. Allowable vertical axial load capacities range from 100 to 500 kips. Noise, disturbance and vibrations are minimal during the installation process.

Grout Injection Cased Micropiles

Grout Injection Cased Micropile are a deep foundation drilling method that produces a pile with exceptional and predictable performance. High pressure grouting is introduced the entire duration of pile installation. This pressurized grout encases all reinforcing elements (including permanent casing) in high strength grout, thus providing the highest load carrying, and most superior corrosion protected, piling.

Helical Piles

Our Helical Pile System is engineered to perform and properly tested in accordance with documented standards and criteria for tension and compression. Helical piles are deep foundation elements constructed using steel shafts with helical flights. The shafts are advanced to bearing depth by twisting them into the soil while monitoring torque to estimate the pile capacity. A thorough understanding of the subsurface conditions is necessary to properly interpret the torque conversion and feasibility of installation. Helical piles are not recommended for cobble, boulders, hard, and unknown sub-surface conditions.

Sheet Piling

Sheet pile walls consist of driven interlocked composite panels. Each pile is engaged with and driven in alongside the previous one, thereby creating an impervious wall. Common designs used include seawalls, cofferdams and retaining walls. Sheet pile walls are commonly used in the marine environment for the construction of docksides and piers, and on inland waterways to reinforce canal and river banks.