Granby Foundation Lift & Stabilization

PROBLEM

Located in the mountains of Colorado, this 15 year old residence had settlement occur in the foundation, and resulting damage to exterior facings, windows, doors and casings as well as interior damage to drywall and wall finishes. 

The owner had recently purchased the home and was referred to CST by a previous customer. CST was contacted to assess the issues with the foundation, and provide a solution to repair the settled foundation and mitigate against future settlement. The homeowner wanted the repairs made on the foundation prior to beginning additional mechanical and cos-metic repairs such as replacing cracked windows, doors, and interior/exterior finishings which needed to be completed soon as cracks and gaps were causing issues with keeping the cold winter air out of the home. 

SOLUTION

An initial site elevation survey conducted by CST revealed that the home’s foundation had experienced settlement of approximately 2 inches. 

The biggest area of differential movement had occurred in the great room and front entrance areas of the home. 

CST performed Soil Density tests in order to determine the weak soil zones and set benchmarks prior to designing the injec-tion plan. Once injection locations were determined, CST installed a high density expanding structural polymer into the soil, at determined depths. Working from the exterior, with crew members monitoring from the interior great room, the team lifted the settled areas back to original elevation. 

RESULT

The entire repair of this home’s foundation was completed in less than 2 days. CST lifted the settled foundation without causing additional damage to the home and adjusted windows enough that they were able to be latched where previously they had not. 

CST’s repair process is non-invasive and the residents were able to stay in their home during the repair. 

By stabilizing the foundation’s underlying soils, the home was protected against any future settlement or movement, allowing the owner to quickly move forward with completing the mechanical and cosmetic repairs to their home. 

CHALLENGES

  • Completing foundation repair in mid-December in order to protect the interior of the home and it’s occupants from winter elements. 
  • Lift the foundation without causing additional damage to the home’s finishes. 

BENEFITS

  • In Situ, no excavation foundation repair. 
  • Repairs are completed quickly, with very little disruption or mess. 
  • Families may stay in their homes during repair. 
  • Effective and efficient, long lasting protection for your assets. 

Drain Pan Void Fill Structural Support CDOT Region 1

A drain pan structure running adjacent to US-287 near Broomfield Colorado had experienced significant voids of varying severity beneath the structure. The drain pan was designed to move water away from the roadway during water events and run off; however, due to issues with the design of this particular structure, water was running beneath the concrete and eroding areas beneath the pan. The integrity of the structure was compro-mised due to the weakened and eroded supporting soil.

CDOT needed an effective solution to treat and repair the almost 800 foot long problem section of drain pan that would not only fill the voided areas, but also protect it against additional damage and structural failure that may also effect the safety of the adjacent highway.

A thorough evaluation of the site was conducted prior to design of the repair plan for the drain pan. It was determined that the more severe voids were located on the uphill slope area of the structure. Alternate solutions, including a flowable fill, were taken into account while determining the most effective way to treat the area. However, due to the advanced features of CST’s proprie-tary injection process, and the unique characteristics of the specialized expanding structural polymer, it was determined that filling the voided areas using this process would most effectively and most efficiently solve the problem. Injections were made directly through the drain pan, filling voids, and strengthening the supporting soils.

The entire stretch of affected drain pan was void filled and stabilized in four days without any disruption to traffic flow along the adjacent highway.

The treatment method allowed CDOT to extend the use life of the structure and avoid the expense of tearing out and replacing the structure.

The specifically designed repair not only eliminated the void space beneath the pan and strengthened the soils, but also provided protection to the structure against future erosion.

Repair costs came in under budget for this project.

Concrete Slab Lift Asphalt Pavement Lift Soil Stabilization – Pueblo, CO

This highway roundabout located in Pueblo West, Colorado had experienced settling of between 2 to 3 inches in areas of the concrete panels. The settlement had occurred as a result of poorly compacted soils. The settlement of the slabs had created a negative drainage situation, causing water to pool against the curb and gutter instead of draining away from the structure as originally designed.

As part of a larger paving project, Martin Marietta, a heavy highway contractor working on the section of roadway that included this roundabout, needed a solution to lift the settled concrete panels and correct the drainage issues the settlement had caused without ob-structing traffic flow through the rounda-bout and connecting roadways.

CST partnered with Martin Marietta to create a repair plan that would allow traffic to continue to flow through the roundabout while the panels and adjoining asphalt were lifted back to original profile. CST’s technologies were used to repair the settled slabs and pavement. The process employs injecting an expanding structural polymer that densifies and compacts soil, fills voids, and lifts settled concrete and asphalt. A rubberized barrier was used to assist injection crews in staging and protecting injection hoses across the roadway which allowed traffic to safely continue through the roundabout during the repair process. Martin Marietta used a water truck to wet down the roadway and panels to assist CST’s injection crew in locating and correcting the areas of settlement prior to beginning injections.

The settlement and soil compaction issues were efficiently and effectively addressed and corrected while allowing traffic to continue use of the roundabout and roadways during the repair. The con-crete panels and adjacent asphalt pavement were lifted back to original design profile which corrected the drainage problem.

The repair was completed in less than a day, preserving the existing concrete, correcting drainage, and guarding against future damage erosion, settlement, or damage to this roundabout structure and adjacent roadway.

CHALLENGES
Maintaining traffic flow during repair.
Safely staging injection equipment in the roundabout area.
Restore drainage away from the concrete panels.

BENEFITS In situ, no excavation repairs
Little to no downtime
Fast, cost -effective, permanent
Preserves and extends the life of existing structures & pavement