California Water Service Generator Building Slab Lift

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Generator Building Slab Lift Project Challenges

Client:   California Water Services
Location:   Bakersfield, CA
Project Summary: Pump Station Generator building had severe settlement due to a severed water line undermining the support soils.

A pump station building holding backup generators was experiencing severe settlement after an 8-inch water line severed and undermined the support soil. Publicly bid project that was initially designed to use helical piers, as bedrock was at -70′ and the piles would be able to support the structure at -40′.

Generator Building Slab Lift Solutions and Results

Based on the engineering report, EagleLIFT determined that up to -20′ consisted of weak soils and could be strengthened using a two-part chemical grout and a specialized injection method, referred to as Deep Injection.  EagleLIFT provided an alternate bid and subsequently won the project.  After a 4 day installation, EagleLIFT stabilized and lifted the slab to grade and repaired the cracks using carbon fiber staples and epoxy.

Our Projects

Pine Creek Voidfill

Pine Creek Mine Void Fill and Foundation Lifting

Foundation Lift and Void Fill of building at the Pine Creek Mine

Pine Creek Voidfill2

Project Challenges

Client:   Pine Creek Mine
Location:   Bishop, CA
Project Summary: Foundation Lift and Void Fill of building at the Pine Creek Mine

Customer needed to lift, stabilize and void fill underneath a building that was settled as much as 15” in the most severe corner. The entire footer of the building was encased in an underground network of timber that was part of the 38ft. retaining wall cribbing. Timber removal was a challenge to access the footing, for each push pier install.

Solutions and Results

30 push piers installed along the perimeter of the back wall, and halfway down the perpendicular side walls of the building. Expanding polyurethane injected beneath the slab to fill the voids created by the lift. Although the goal was to recover the 15”, the building was lifted 10” before the tension rods of the building could become dangerously tight.
Project duration was 5 days.

Our Projects

Skyline Parc Multi Residential Building Settlement

Skyline Parc Multi Residential Building Settlement

Slab Lift, Void Fill and Deep Injection Soil Stabilization to Repair Multi-Residential Apartment Building Settlement

Pool Wide Crack

Project Challenges

Client:   Skyline Parc Apartments
Location:   Las Vegas, NV
Project Summary: Slab Lift, Void Fill and Deep Injection Soil Stabilization of Multi-Residential Apartment Building

The Skyline Parc apartments in Las Vegas, NV was experiencing severe building settlement due to poor site drainage that was washing our foundation soils along the back perimeter of the building. The poor drainage caused settlement of nearly 9 inches and needed to be repaired quickly.

EagleLIFT was contacted by SFA Engineers to determine that Deep Injection would be a good fit for lifting and stabilizing the building and the adjacent pool deck.

Solutions and Results

Deep Injection was an ideal fit for soil stabilization and lifting the foundation for this job.  The reason is that voids were found throughout the building perimeter and the soils were loose and needed to be stabilized to prevent further washout.

The approach used injection locations at every 4 feet.  With this plan, the polymer would expand and densify the soil.  This would create upward movement and help lift the structure.  Additionally, the soils were stabilized and the voids were filled, preventing any future building settlement.

Our Projects

Helical Pile Seismic Upgrade – El Segundo, CA

EagleLift Installs 25 Helical Piles for a Foundation Augmentation Helical Pile Seismic Upgrade Project for a Structure in El Segundo, CA

Segundo Piers Ad EagleLIFT

Project Challenges

Client:   Xerox Corporation
Location:   El Segundo, CA
Project Summary: Helical Pile Seismic Upgrade Project for a Structure in El Segundo, CA

The building in El Segundo was formerly occupied by Xerox Corporation, and the owners decided to convert the building into a mixed use facility or both commercial and residential use.

The original deep foundation plan specified 24” caissons to support the staircases, but the low head clearance eliminated this option. Helical piles were selected, and the (25) helical piles were installed to add support for staircases and interior columns. The helical piles also provided a seismic upgrade solution for the structure.

Solutions and Results

The helical piles consisted of a 2.00” RCS lead section with 8”,10”,12”,14” helix bearing plates. Following the lead section were 4.50” round shaft sections used to reach the 25 ft. average install depth.

The very low head clearance provided challenges for the crews as did some newly installed underground utilities. An open basement around two of the column pad areas required crews to wear fall protection gear during the installation.

A tension test was successfully completed to 2x the design load of 150 kips. The install work was tedious and time-consuming with having to deal with so many variables, but the project was successfully completed in (7) days.

Our Projects

Caltrans – Ferry Loading Dock Ramp Void Fill

Caltrans – Ferry Loading Dock Ramp Void Fill

Caltrans - Ferry Loading Ramp Void Fill Project

Caltrans loading dock California Slab Lift3

Project Challenges

Client:   Caltrans
Location:   Rio Vista, CA
Project Summary: Ferry loading ramp void fill project

Caltrans had a problem with one of its Ferry loading docks in Rio Vista, CA – it was being undermined by a family of beavers that had made a home underneath the boat ramp!  As strong as the ramp was built, the concrete would not be able to withstand the significant weight stess on its own, it would need adequate support soils to help in this ferry loading ramp void fill project.

The beavers had caused voids ranging from 6″ to 1′ throughout the 44’x24′ slab, and the voids needed to be filled and the weight-bearing capacity of the soil restored or there would be potential for service interruption. Caltrans contacted EagleLIFT to see if they could perform the ramp void fill so the dock could be solved.

Solutions and Results

Solution
Once the loading ramp void fill locations were determined by use of Ground Penetrating Radar (GPR), EagleLIFT utilized the shallow surface chemical grout injection to fill the voids and densify the remaining soil.  Our polymer injection process is a unique application that allows for a high-density structural polymer to be injected underneath a structure with only 1/2″ holes in the slab. Once injected, the polyurethane seeks out the voids in liquid form and then it begins to expand through the void and the adjacent soil, creating a subsurface weight-bearing monolith.  EagleLIFT’s two-part chemical grout polymer was ideal for this application due to its hydro-insensitivity, quick set time and it being environmentally inert.

The Result
The loading ramp was stabilized in 3 shifts, minimizing the downtime of the dock and restoring service in one day. All of the voids were stabilized and the weight-bearing capacity of the concrete ramp was restored. All of this was done without harming one single Beaver!

Our Projects

VA Office Slab Lift

Veteran Affairs Building Slab Lift – San Diego, CA

Veteran Affairs Office Building Slab Lift and Foam Jacking

Project Challenges

Client:   Veteran Affairs Office Building
Location:   San Diego, CA
The Veteran Affairs office building in San Diego, CA was experiencing settlement issues with its interior slab. After DCP tests were performed in 3 different locations to determine if issues were direclty below the slab or at depth.  The test determined the existence of weak soils at 8 to 16 feet below surface. The building required a slab lift to get the floors back into a useful condition.

In order to deal with the slab settlement, EagleLIFT designed a soil stabilization slab lift approach utilizing a chemical grout injection process that densifies the soil upward.  The process is unique in that it requires no-excavation and a minimal footprint for stabilizing the slab.

Solutions and Results

The chemical grout injection process was performed by injecting the chemical grout at 9′, 12′ and 15′ depths.   The injection pattern stabilized the loose soil layer and increased its weight-bearing capacity.  After the soil layer was stabilized, EagleLIFT conducted the slab lift by injecting directly underneath the slab.

The project was completed in 3 shifts over a weekend with no interruption to the facilities operations. The floor was lifted the full 4 inches and the and the slab was lifted back to original grade. EagleLIFT worked with STSC Engineering to develop a design plan for this slab lift project.

Our Projects

Utility Trench Repair California

La Quinta, CA Utility Trench Repair and Soil Stabilization

Utility Trench Repair and Soil Stabilization of a California Roadway

Chemical grout injection process to stabilize and lift the roadway

Utility trench repair requiring stabilization of the utility trench’s support soils that were loosely compacted causing subsidence and settlement of flexible pavement roadway.

Project Challenges

Client:   City of La Quinta, CA
Location:   La Quinta, CA

The City of La Quinta, CA was experiencing substantial roadway settlement that was due to soil subsidence caused by loosely compacted soils around a utility trench.  The cause of the soil subsidence was believed to be because of the improper compaction of the sandy soils at the base of the trench and also potential inflow and infiltration into the clay pipe.  The utility trench repair was needed and the soil needed to be stabilized and compacted to prevent further subsidence and roadway settlement.

The problems were also being exacerbated by the ever increasing weight of the flexible pavement road.  In order to relevel the roadway, the City would be forced to repave over the road and temporarily level it.  The added weight only increased the subsidence, as the soils were not able to bear any additional loads. The City of La Quinta needed an innovative solution to complete this utility trench repair project.

Solutions and Results

1,170 linear feet of the the roadway and utility trench needed to be stabilized.  In order to do this, the soils above the 15′ deep sewer line needed to be compacted and its weight bearing capacity needed to be re-established.  Another part of the utility trench repair was to lift and level the roadway.

EagleLIFT utilized a chemical grout injection process to stabilize the soils and to lift the roadway back to grade.  Through 5/8″ holes and metal tubes inserted 5′ and 10′ above the utility trench and at 3′ to the left and right of the center locations.  Since the primary roadway settlement was occuring immediately above the trench the key was to densify and create upward movement in the center injection points.

The patterened injection method ensured that the soils would no longer subside and collapse into the trench. In summary, the entire 1,170 linear feet of the trench was stabilized in 7 working days and ahead of schedule. The flexible asphalt pavement was lifted and leveled and the work was completed in the daytime hours to reduce noise disruption.

Roadway Lift Chemical Grout

Our Projects

Foundation Underpinning San Francisco

Foundation Underpinning San Francisco Project

Helical piles installation for foundation underpinning San Francisco project

EagleLIFT provided the Fair Oaks West Apartments building with a helical piles for the foundation underpinning San Francisco project. This rennovation project was designed to rehabilitate and increase the load bearing capacity of the building.

Foundation Underpinning San Francisco

Project Summary

Client:   Fair Oaks West Apartments
Location:   San Francisco, CA
Project Summary: Building Foundation Underpinning San Francisco for upgrading an older building

When the decision was made to upgrade and expand the old structure, the structural engineer determined that underpinning the entire building was required in order to provide the necessary structural support before excavating could begin. Also, additional load bearing capacity was required to support the planned addition.

As with all new construction in San Francisco, seismic retrofitting is also a requirement.

Foundation Underpinning San Francisco Design

Before excavation could begin, EagleLIFT crews installed (61) 1.75” RCS helical piles with 8”,10”12” bearing plates to depths ranging from 20 to 60 feet. (55) of the helical piles were installed on the outside perimeter and (6) piles were installed on the interior. The ultimate load requirement for the piles was 83 kips, and the working load was 55 kips.

The helical pile installation project was successfully completed in 20 working days for this foundation underpinning san francisco project.

An interesting bit of anecdotal information – the helical piles were all installed just a couple of days prior to the Napa seismic event. The structure was examined closely, and the engineer determined there was no sign of movement or a change of any kind.

Our Foundation Underpinning San Francisco Projects

EagleLIFT Polymer Injection Foundation Lift and Foundation Repair

Port of Oakland Foundation Repair – Oakland, CA

Port of Oakland Foundation Repair – Oakland, CA

Project Challenges

Client:   Port of Oakland
Location:   Oakland, CA
Problem Summary: Settlement of gantry crane wheel path of 1/2″ to 4″

Over the years of heavy use, the pavement, base and sub-base beneath the Port of Oakland’s gantry crane wheel paths had started to subside.  Ground subsidence is very common in situations as this, cyclical loading and heavy loading conditions, especially when the loads have increased over the years. The differential settlement not only made it difficult for the operators to align their cargo properly, but also created a safety hazard while the cranes traveled amongst the site. The settlement ranged anywhere from a 1/2″ up to 4″ at the worst case.

Port of Oakland Chooses EagleLIFT

When it comes time for Port Engineers to evaluate the different repair processes for their pavement maintenance and rehabilitation, numerous factors must be considered.  Factors such as down time to the end client, company qualifications, company experience and services being offered.

Once these factors were taken into account, only one contractor met the criteria:  EagleLIFT, Inc.

Solutions and Results

Prior to any injections taking place, EagleLIFT conducted a series of Dynamic Cone Penetration (DCP) tests to measure the relative soil density.  The DCP tests indicated that the sub-base needed to be densified at the -2.5′ depth.

Deep Injection was then utilized to densify those soils and lift the pavement to grade. The two-part polymer material is injected through 1/2″ tubes which are driven down to depth through the pavement.  The resulting mixture polymerizes beneath the slab, creating minimal heat with optimum expansion.  With this expansion, the material aggressively seeks out voids filling them while densifying surrounding soils and lifting the pavement back to its original elevation eliminating the settlement.

This Port’s proactive approach and willingness to embrace new technology allowed EagleLIFT to work with Port officials and Engineers to address the settlement issues and possible solutions for it. This particular project exhibited the greatest problem to the client since closing the aisles, removing the pavement and replacing it would not only be costly, but also highly disruptive to Port operations.

This method was chosen for the following reasons.  First, laboratory testing of the material used, proved it maintains its integrity for more than 10 years with no shrinkage or degradation.  Recent studies of other one-part grouts found that conventional grouts are significantly impacted by the factor of time and “wet/dry” cycles.  This unique method is quick, eliminates the need for removal and re-pouring as well as dramatically decreasing the disturbance to normal use if this area.  Resins injected cure within 15 minutes allowing full use to be restored almost immediately after the work was completed.

Our Projects

EagleLIFT Foundation Repair Parking Lot

Home Depot San Francisco Concrete Lift

Home Depot San Francisco Concrete Lift

7 inch home depot

SAN FRANCISCO CONCRETE LIFT Challenges

Client:   Home Depot
Location:   San Francisco, CA
Problem Summary:  12″ thick 32″x25″ hinge slabs settled more than 7.5″

Home Depot Chooses Patented Polymer Slab Lifting Technique to Lift Sunken Hinge Slabs.

Deep injection process was chosen by Home Depot to eliminate some settlement / ponding issues of various hinge slabs. These hinge slabs were approximately 32’x 25’ and were more than 12” in thickness. The slabs needed to be lifted an average of 7.5”.

The unique process of deep injection relies on the expansive properties of a two-part expanding resin system (an expansion co-efficient of twenty to one) and a quick cure (15 minute cure time), to lift and re-align while stabilizing weak soils beneath slabs on grade.

LOW COST CONCRETE LIFTING METHODS IN SAN FRANCISCO

The two-part polymer material is injected through 5/8″ inch diameter holes drilled through the slabs. The resulting mixture polymerizes beneath the slab, creating minimal heat with optimum expansion. With this expansion, the material aggressively seeks out voids filling them while densifying surrounding soils and lifting the slab back to its original elevation eliminating the settlement.

This firm’s proactive approach and willingness to embrace new technology allowed EagleLIFT to work with company officials to address the settlement issues and possible solutions for it. This particular project exhibited the greatest problem to the client since re-pouring the slab would not only be costly, but also highly disruptive to daily operations

Home Depot San Francisco Concrete Lift Solutions and Results

The technicians drilled the 5/8” holes through the slab as a means of delivering the two part polymer to the underside of the slab. Because the material is self-propelled, the polymer expands to gain resistance from soils while aggressively filling voids. Once the voids have been effectively filled and the base soils compressed, the slab begins to lift.

Injections Successful:

EagleLIFT was able to lift 13 back to within 1/8” of their original elevation in approximately 4 shifts. The structural resins reach 90% of their compressive strength within 15 minutes allowing for immediate use of the slab after treatment. The reason for the accuracy is that the method does NOT depend on the pumping pressure, as some of the conventional methods do, but rather on the expansion rate of the resin. All parties were very pleased with the work done, the short length of time it took to successfully complete the project and the cost savings that resulted.

Our Projects