Drilled Shafts
CDI specializes in the installation of drilled shafts, which are critical for the foundations of buildings, bridges, and industrial installations. Utilizing advanced techniques such as down hole hammers, rotary bits, and reverse circulation, CDI can handle various ground conditions, from hard rock to soil. Our drilled shafts provide stability and load-bearing capacity, ensuring the structural integrity of your project. Whether for commercial or industrial applications, our expertise in drilled shafts guarantees precise and reliable foundation solutions.
Hard Rock Drilled Shafts
Construction Drilling specializes in technical hard rock drilling solutions. We pride ourselves on finding solutions to install drilled shafts in all types of rock formations. With over 100 years of combined experience and an extensive equipment inventory, we have utilized the following hard rock drilling equipment and techniques:
- Down hole hammers from 6“to 4’
- Rotary bits from 4’ to 10’
- Rock sockets from 6” to 10’ up to and past 300 feet deep
- Under-reamed drilled shafts
- Dual rotary drill systems
- Reverse circulation
- Reverse flood drill system
Soil Drilled Shafts
Construction Drilling’s extensive auger and equipment fleet includes restricted-access rigs (for access to difficult sites), as well as large-diameter high-torque rigs for very deep and very hard drilling conditions. Our modern auger fleet ranges from specialized low-headroom drill rigs, such as the LoDrill, to adaptable European hydraulic drilling rigs. These drill rigs are accompanied by an extensive tooling inventory consisting of augers, buckets, turners, and core barrels ranging from 10” to 10’. These rigs are used to drill open shafts or clean out installed casing.
At times, given access constraints, hammer grab and spherical grab shaft excavation is more economical and efficient: e.g. in cases where a crane is the only piece of equipment with the reach to access the shaft location. In marine applications, we often find that splice lengths are too long for a drill to enter the casing.
Construction Drilling has a large inventory of grabs ranging from 30” to 10’, along with the churns, chisels and rock breakers to ensure installation and excavation are successful.
Cased Drilled Shafts
Casing is required when ground conditions are unstable and drilled holes cannot safely be drilled open. Casing can be permanent, but when drilling in soil it is typically temporary. Construction Drilling utilizes casing oscillators and rotators capable of installing casing from 6” to 6.5’. Oscillators and rotators can be used to install casing when vibration and noise are a concern, and vibratory and impact hammers can be used when these are not a concern.
The use of casing is a proven method to install drilled shafts in soil-caving conditions such as gravels, loose sands, soils, cobbles, boulders and water-saturated media. Construction Drilling has successfully cored through boulders over 6’ in diameter during shaft excavations. Using oscillators and rotators in combination with down-hole hammers, augers and grabs is a sure method of shaft installation in any soil or rock condition. This removes risk and allows Construction Drilling to supply a high-quality product on schedule.
