Deep foundation support for a new 68,500-square-foot elementary school
Three Springs Elementary School required reliable deep foundation support for its new 68,500-square-foot campus in Durango, Colorado. However, variable soil conditions created installation challenges across the building footprint.
The project also presented significant logistical demands. Durango is several hours from Straight Line Construction’s Pueblo headquarters, requiring careful coordination of multiple crews, equipment, materials, and long-distance deliveries. At the same time, crews had to adapt their installation methods as subsurface conditions changed across the site.
Straight Line drew on more than 45 years of foundation experience to develop an efficient installation approach for the project. The team coordinated multiple crews, developed custom drilling tools, optimized material handling, and adapted installation methods to the site’s changing conditions. These efforts helped Straight Line efficiently install the massive micropile system while maintaining production throughout the project.
Project at a Glance
- Project: Three Springs Elementary School
- Location: Durango, Colorado
- Construction type: New elementary school construction
- Building size: 68,500 square feet
- Total micropiles installed: 606
- Battered micropiles installed: 112
- Micropile diameter: 6 inches
- Design capacities: 40 to 100 kips
- Installation depths: 21 to 64 feet
- Reinforcement: Multiple threaded reinforcing bar sizes
- Custom tooling: PDC drilling bits developed for site conditions
- Testing: Four verification tests and proof testingÂ
Variable Soils Required an Adaptable Micropile Foundation System
The site contained clay over claystone. The design anticipated claystone at an average depth of approximately 32 feet. However, the claystone elevation changed across the property.
As a result, drilling conditions varied from one micropile location to the next. Some micropiles reached claystone sooner. Others required deeper installation into competent material.
Straight Line installed 606 micropiles from 21 to 64 feet deep. This range allowed the team to meet the required design criteria at each location. The adaptable micropile foundation system also supported changing conditions across the large school footprint.
Custom Tooling Kept 606 Micropiles MovingÂ
Drilling efficiency was critical on a project with 606 micropiles. Straight Line worked with manufacturers to fabricate custom PDC drilling bits suited to the site’s clay and claystone conditions. The specialized tooling helped crews adapt to changing subsurface conditions while maintaining efficient production across the large building footprint.
Multiple crews worked in coordination, supported by optimized material handling and installation methods. Together, these efforts improved the economics and efficiency of the micropile installation while maintaining the required performance and schedule.
Drawing on more than 45 years of foundation experience, Straight Line adapted its approach to the project’s scale, soil conditions, and production demands rather than relying on a one-size-fits-all installation method.
Major Logistics Were Required to Keep a Remote Project MovingÂ
Durango is several hours from Straight Line Construction’s Pueblo headquarters. With 606 micropiles to install, keeping crews supplied was a project in itself.
The team coordinated multiple crews, drilling equipment, material handlers, grout materials, and deliveries throughout installation. Grouting created a continuous demand for cement, requiring cement tankers to make approximately 12-hour round trips every three days. The team also planned around road construction, detours, and wildfire-related travel conditions.
Straight Line’s experience was critical to keeping these moving parts coordinated. Materials had to arrive when crews needed them, equipment had to remain productive, and installation could not stop simply because the project was located hours from the company’s headquarters.
Through detailed planning and coordination, the team maintained a steady installation pace throughout the 606-micropile project.
Multiple Micropile Configurations Addressed Complex Foundation LoadsÂ
The foundation design included several micropile configurations. This approach allowed the system to address different load demands across the new school.
Straight Line installed both vertical and battered micropiles. Vertical micropiles provided deep axial support beneath foundation elements. Meanwhile, crews installed 112 battered micropiles at 20 degrees to help resist lateral loads.
The team also used multiple threaded reinforcing bar sizes. Each configuration matched the structural requirements at its assigned location. Together, these elements created a flexible micropile foundation system for the Three Springs Elementary School project.
Testing Confirmed Performance Before and During ProductionÂ
Straight Line completed pre-production verification testing on four micropiles before beginning full production. These tests confirmed that the planned micropile foundation system could meet project performance requirements under field conditions.
The team also completed proof testing on approximately 2% of production micropiles. Proof testing verified the performance of installed production micropiles at selected locations.
Successful testing gave the project team confidence in the completed deep foundation system. More importantly, it confirmed that the micropiles performed as designed in the project’s variable soil conditions.
Micropile Foundation Support for a Durango School
Three Springs Elementary School required far more than the installation of 606 micropiles. The project demanded experienced crews, detailed logistics, specialized tooling, adaptable installation methods, and careful coordination across a large and remote jobsite.
Straight Line Construction drew on more than 45 years of foundation experience to bring those pieces together. From managing long-distance material deliveries to developing custom drilling tools and improving installation efficiency, the team continuously adapted its approach to keep production moving.
The result was an efficiently installed micropile foundation system capable of supporting a 68,500-square-foot school despite changing subsurface conditions and significant logistical demands.
This project demonstrates Straight Line’s ability to take on foundation work at scale—and develop the people, processes, and installation strategy required to deliver it efficiently.
Need a Micropile Foundation System?
If your project requires micropile installation or deep foundation support, contact Straight Line Construction. The team can evaluate your site conditions and discuss an approach built around your foundation requirements.
