CIDH Piles (Drilled Shafts)

Cast-in-Drilled-Hole (CIDH) piles—known also as drilled shafts, drilled piers, bored piles, and caissons—are a type of deep foundation type employed when soil is unable to support a structure and driven piles are unfeasible, impractical, or too costly. CIDH piles are reinforced with rebar cages or wide-flange steel beams and then back-filled with concrete. They derive their axial capacity from the friction present around the shaft’s circumference, and, at times, the bearing capacity at the bottom of the shaft.

Construction Process

CIDH piles are constructed by drilling a hole into soil or rock, placing steel reinforcements, and filling the hole with concrete. Our extensive equipment fleet allows us to drill up to 15 feet in diameter and more than 200 feet deep. In weak soil conditions, when the soil would cave in or slough into the shaft, Drill Tech uses temporary casing to drill, with the help of an oscillator or vibratory hammer. We also regularly use drilling fluids to improve stability. Our team is familiar with the use of down-the-hole hammers, which can be necessary in harder rock conditions. In such cases, a large hammer pulverizes or chips the rock and compressed air carries the cuttings up to the surface.

Benefits of Use

For over a century, CIDH piles have been used in place of driven piles. These piles are versatile and able to be installed in almost any ground condition, from soft clay to hard bedrock. CIDH piles can carry a larger load compared to other deep foundation types and have the added benefit of limiting the amount of vibration required during installation.

Applicable Projects

Highway
Overpasses

Bridges

Retaining Walls

New Foundation
Construction

Construction Process

CIDH piles are constructed by drilling a hole into soil or rock, placing steel reinforcements, and filling the hole with concrete. Our extensive equipment fleet allows us to drill up to 15 feet in diameter and more than 200 feet deep. In weak soil conditions, when the soil would cave in or slough into the shaft, Drill Tech uses temporary casing to drill, with the help of an oscillator or vibratory hammer. We also regularly use drilling fluids to improve stability. Our team is familiar with the use of down-the-hole hammers, which can be necessary in harder rock conditions. In such cases, a large hammer pulverizes or chips the rock and compressed air carries the cuttings up to the surface.

Benefits of Use

For over a century, CIDH piles have been used in place of driven piles. These piles are versatile and able to be installed in almost any ground condition, from soft clay to hard bedrock. CIDH piles can carry a larger load compared to other deep foundation types and have the added benefit of limiting the amount of vibration required during installation.

Applicable Projects

Highway
Overpasses

Bridges

Retaining Walls

New Foundation
Construction

Construction Process

CIDH piles are constructed by drilling a hole into soil or rock, placing steel reinforcements, and filling the hole with concrete. Our extensive equipment fleet allows us to drill up to 15 feet in diameter and more than 200 feet deep. In weak soil conditions, when the soil would cave in or slough into the shaft, Drill Tech uses temporary casing to drill, with the help of an oscillator or vibratory hammer. We also regularly use drilling fluids to improve stability. Our team is familiar with the use of down-the-hole hammers, which can be necessary in harder rock conditions. In such cases, a large hammer pulverizes or chips the rock and compressed air carries the cuttings up to the surface.

Benefits of Use

For over a century, CIDH piles have been used in place of driven piles. These piles are versatile and able to be installed in almost any ground condition, from soft clay to hard bedrock. CIDH piles can carry a larger load compared to other deep foundation types and have the added benefit of limiting the amount of vibration required during installation.

Applicable Projects

Highway Overpasses

Bridges

Retaining Walls

New Foundation Construction

CIDH Pile Mitigation

Drill Tech has successfully mitigated anomalies in Cast-in-Drilled-Hole (CIDH) piles ranging from 2- to 12-feet in diameter at depths between 5- and 200-feet below the surface. Our engineers and technicians are well versed in anomaly analysis, removal procedures, logistics and plan execution, and final reports.

Construction Process

We use high-pressure (up to 30,000 PSI) water blasters to remove unsound concrete from CIDH piles. We access the anomalies either through holes cored through the concrete or PVC inspection pipes previously installed in the pile’s rebar cage. The swift removal of unsound concrete mitigates any anomalies or danger present in the concrete.

Benefits of Use

Our team is equipped to perform CIDH pile mitigation in house, which prevents potential delays to the project schedule. This internal process eliminates external review times, equipment unavailability, multi-provider inefficiencies, or increased costs.

Construction Process

We use high-pressure (up to 30,000 PSI) water blasters to remove unsound concrete from CIDH piles. We access the anomalies either through holes cored through the concrete or PVC inspection pipes previously installed in the pile’s rebar cage. The swift removal of unsound concrete mitigates any anomalies or danger present in the concrete.

Benefits of Use

Our team is equipped to perform CIDH pile mitigation in house, which prevents potential delays to the project schedule. This internal process eliminates external review times, equipment unavailability, multi-provider inefficiencies, or increased costs.

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