Specialization in full lifecycle mechanical and structural elements for material conveyance, bulk material handling, buildings, cranes, and associated equipment.
Installation, maintenance, and mine development.
Services for processing and shipping, emphasizing efficiency in production.
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Compressed air is injected into the drill pipe below water level into an air chamber at the cutter head. As the air rises and expands within the drill pipe, the density in the internal liquid column is reduced.
The higher density of the water column outside the drill pipe causes the overburden and drill tailings to pass from the shaft, through the cutter head and rise up through the drill pipe. The tailings are lifted to the surface with the help of the rising air.
Construction Drilling utilizes a Wirth PBA 612 pile top drill rig when reverse flood drilling. We have been successful installing shafts from 50” to 78” in diameter, up to 300’ deep.
For large-diameter deep drilled shafts, we primarily use rotary bits as we find the rotary method to be the most stable, non-aggressive way to install drilled shafts. With the rotary head reverse flood method, no air is introduced to the rock formation.
They are all similar in that they use a steel ring welded on to the bottom of the casing. The down hole hammer and steel ring are locked together, and the hammer drives on the steel ring. Together, they drill a hole large enough to allow the casing to be pulled into the drilled hole. A rock socket can be drilled below an under-reamed pile. We have experience with every type, and choose them based on overburden type, rock type and cost.
Under-reamers are particularly useful in offshore applications. We have many hanging lead drill systems that can utilize various under reaming systems from 12” to 36”.
A compressor supplies air which travels through the drill pipe to the down hole hammer, where it drives the piston as it strikes the bit directly. This provides a very efficient transmission of impact energy through the bit into the rock, breaking the rock and drilling the hole.
Our drill bits are available in different sizes allowing us to drill a wide range of hole sizes from 6” to 50”. For holes larger than 50” we recommend using a cluster drill or rotary head.
Reverse Circulation, or RC Drilling, is a clean and environmentally friendly method of deep foundation installation. It employs dual-wall drill rods, comprised of an outer drill rod with an inner tube (Figure 1). As the sections of drill rod are screwed together, the inner tubes overlap and seal with O rings. This provides a continuous path for the drill tailings to be transported from the bit face to the surface.
Our dual rotary drill rigs are used when casing has to be socketed into hard bedrock. They can also be used when sand, gravel, cobbles and large boulders make it challenging to drill a cased hole. The versatility of dual rotary drilling makes it one of the most efficient, low-risk and cost-effective methods for drilling in difficult formations.
Construction Drilling has dual rotary drill systems that can handle holes from 6” to 10’ (3.05m) in diameter.
CDI’s pile driving services form the backbone of many construction projects, providing strong and reliable foundations for buildings, bridges, marine structures, and industrial facilities. Our team is equipped to handle diverse pile types, including steel H piles, steel pipe piles, concrete piles, and timber piles, using a variety of equipment such as hydraulic hammers and vibratory drivers. These methods enable us to adapt to different site conditions and soil types, ensuring stability and safety for long-term structural integrity.
Pile driving is used to support deep foundations, particularly in areas with challenging soil conditions or where high load-bearing capacity is required. This service is essential for the construction of heavy infrastructure projects, such as bridges and high-rise buildings, as well as for stabilizing slopes and supporting temporary structures. CDI’s expertise in pile driving ensures that each project is executed with precision and efficiency, contributing to the overall success and durability of the structures we help build.