Drilled Pier Foundations in Wyoming

Drilling a pier is a sequence of small decisions, and each one shows up in the finished shaft. How fast the auger turns, whether the hole stays open, how clean the bottom is, how the cage is hung and when the concrete goes in all matter. A pier that looks fine at the top can be bad twenty feet down.

We build drilled piers for structures that carry heavy loads, resist uplift or sit on soil that cannot carry a footing. Typical uses are column supports for plant buildings, pipe rack and crane bay piers, tower and pole bases, equipment foundations and retaining structures. The drill rig turns a geotechnical report into a hole, and our trade partners turn the hole into a pier.

Big wind and energy work puts piers in the ground at volume. The Chokecherry and Sierra Madre project starts about 3 miles south of Rawlins and calls for roughly 600 turbines up to 390 feet tall. Teton County lists a minimum seismic design category D, and Evansville has a Superfund site with groundwater contamination from former industrial operations. Ground conditions and regulations change fast between towns.

From auger to concrete, step by step

We lay out each pier from survey control and set the rig over the point. The hole is drilled to design diameter and depth, with attention to the soil as it comes up. Where soil caves, we advance temporary casing or use drilling slurry to hold the walls. In rock, we use core barrels or rock augers to drill the socket the engineer specified.

After drilling, we clean the bottom, probe the depth and have the inspector check the hole. The reinforcing cage goes in with spacers so cover is correct, and concrete is placed by tremie or pump through a tube to avoid segregation, rising from the bottom so water or slurry is displaced. Casing comes out as concrete rises, with concrete head kept above the casing bottom. Shaft records are kept for every pier.

Rigs, open holes and wind

A drill rig is a heavy machine working with open holes, spinning tools and tall masts. We keep a clear zone around the rig, cover open holes at the end of each shift and keep the swing radius free of people. Spotters guide trucks near the work, and every crew member attends the safety orientation before stepping on site.

Wind limits rig operation, and masts are lowered in high gusts. Ice around the work area creates slip hazards for crews and trucks. In winter we heat concrete, blanket the completed shafts and monitor temperatures. When a pour starts, it finishes. We build in a backup concrete source for long piers so a breakdown does not leave a half-poured shaft.

Design criteria and special inspection

Wyoming has no single statewide commercial code. The Department of Fire Prevention and Electrical Safety adopted the 2024 International Codes on June 28, 2024, but local governments with delegated authority adopt and enforce their own editions and amendments. Design loads follow the local jurisdiction: Teton County lists a 105 mph basic wind speed, a 34 inch frost line depth and seismic design category D, and directs designers to the ASCE Hazard Tool for snow.

Drilled piers typically require special inspection of the hole, the reinforcement and the concrete placement. We coordinate with the inspector, provide a safe work platform and keep the records the building department expects. Early coordination avoids stop-work orders.

Groundwater, contamination and spoils

Groundwater is the most common complication. A high water table means casing, slurry or dewatering, and every one of them changes the cost and schedule. Wyoming sites near rivers and irrigation can surprise a team that relied on a dry-season boring. We read the report carefully and talk with the geotechnical engineer about seasonal changes.

Contaminated ground adds another layer. Evansville's Mystery Bridge and U.S. Highway 20 Superfund site involves groundwater contamination believed to come from former industrial operations. Near ground like that, drilling spoils and fluids must be handled under the owner's environmental plan, tested and disposed of properly. We build that handling into the scope before drilling begins, since spoils that are mishandled become the owner's liability.

What we deliver

Our scope includes layout, drilling, casing, cage fabrication or placement, concrete, testing, anchor bolt setting and as-built records. We coordinate with surveyors and the geotechnical inspector, and we pair pier work with grade beams and caps. For companion work on equipment bases, see the deep foundations and piers overview, and for steel that will land on the piers see structural steel erection.

Anchor bolts get special care. Groups are set from a template, surveyed before and after the pour and covered to protect threads. The steel erector depends on them. A crooked group can delay erection by days. For very tall or heavy structures, such as those in a high-bay crane-ready building, we add tolerance checks at every stage.

Buildings that depend on piers

Aircraft hangars have wide-open interiors and long-span roofs whose column loads and wind uplift fall on a few footings. Piers carry those loads to competent ground. Large process buildings and crane bays do the same. In each, the pier design reflects the structure above it.

Open-air structures such as pipe racks, flare structures, conveyor towers and transmission supports also rely on piers. They stand in the wind with no walls to share the load, and a small movement at the base becomes a large movement at the top. We match diameter and depth to the structure and verify the finished pier before steel goes up.

What sets the price per pier

The main variables are diameter, depth, soil, groundwater and access. Rock sockets cost much more than soil. Casing adds steel and time. Remote sites add mobilization and camp costs. Quantity helps: a large group of identical piers brings cost down because the rig stays in production.

Owners reduce cost by sharing the geotechnical report early, grouping piers in a compact area and approving casing methods in advance. For heavy industrial owners in metals and heavy industry, foundation delays can idle a whole project, so we plan rig time, concrete and inspection as one critical-path package.

Share the geotechnical report and pier schedule

Send the report, the pier schedule and the site access. We will select a rig and method, price casing and inspection, and show a calendar that works with your steel erection start date.

Common Questions

How deep can you drill?

Depth is limited by the rig, the soil and the diameter. Typical industrial piers range from shallow to well beyond frost depth, and some go into rock sockets. The engineer sets the depth from the load and the soil. We choose the rig to match.

What if the hole caves in?

We use temporary casing or slurry to support the walls. The geotechnical report indicates the risk, and we plan casing before the drilling starts. If caving appears unexpectedly, we stop, notify the engineer and adjust the method.

How do you know the pier is sound?

Inspection and records. The inspector checks the hole depth and cleanliness, the cage and the concrete volume against the shaft volume. For critical piers, integrity testing can detect defects. We keep logs of each pier and hand them over at closeout.

Can piers be drilled in winter?

Yes. Frozen ground can slow drilling but does not stop it. Concrete needs warm materials and protection after placement, and access roads need to carry the rig. We plan winter pours with heat and monitoring.

How close can piers be spaced?

Closer spacing is possible, but drilling next to a fresh pier can disturb it. Engineers set minimum spacing and a rule for drilling near fresh concrete. We follow the sequence in the plan and wait for strength where required.