The bonded portion of a tiedown is the length of the tendon that is bonded to the anchor grout and transmits the applied tensile load into the ground. The unbonded length is the portion of the tendon that is free to elongate elastically and transfer the resisting force from the bond length to the anchorage. Tiedown anchors are corrosion protected with epoxy coating or corrugated plastic sheathing to provide a permanent service life.
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The steel tendons have a free stressing (unbonded) length and a bonded length. The bonded portion of a tiedown is the length of the tendon bonded to the anchor grout and transmits the applied tensile load into the ground. The unbonded length is the portion of the tendon that is free to elongate and transfer the resisting force from the bond length to the anchorage.
Tiedown anchors are corrosion protected with epoxy coating or corrugated plastic sheathing to provide a permanent service life.
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Micropiles can be designed to resist compression, uplift, and lateral loads and are often used as a substitute for conventional deep foundation piles.
Micropiles are especially advantageous because they can be installed in limited access and low overhead environments and in all soil and rock conditions. The equipment used to install micropiles can be relatively small, and thus micropiles can be installed where access may only be a few feet wide, with overhead restrictions as low as 8 feet. Drill Tech is an experienced micropile contractor providing micropile drilling and micropile installation.
Drilled shafts (also called caissons) and drilled piers are deep foundation members commonly referred to as CIDH piles (cast-in-drilled-hole). Drilled shafts derive their load-carrying capacity through both end-bearing (in competent material) and skin friction. Drilled shafts can also be used to resist heavy uplift forces, or in poor soil conditions to resist lateral loads. Drilled shafts are formed by drilling a hole into the soil or rock, placing steel reinforcements (typically rebar cages or steel piles), and filling the hole with concrete. Drill Tech constructs drilled shafts for new foundation construction including bridges, highway overpasses, and buildings. For difficult drilling conditions, Drill Tech can utilize casing and/or drilling, and place concrete under slurry.
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