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 URETEK Method® to fill the voids and densify the remaining soil. The URETEK Method® 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. URETEK’s 486STAR 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

Interior slab lift of building that settled 4 inches

The Veteran Affairs office building in San Diego, CA was experiencing settlement issues with its interior slab. The slab settlement caused separation of the walls from the floor resulting and required a slab lift utilizing our patented polyurethane chemical grout injection process.

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

Project Description

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.

Approach

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.

The patented Uretek Deep Injection process 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.

Results

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 patented Uretek 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.

Featured Projects

EagleLIFT Foundation Repair Parking Lot

Home Depot San Francisco Concrete Lifting

7 inch home depot

SAN FRANCISCO CONCRETE LIFTING

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.

The patented URETEK 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 the URETEK Method 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 Uretek 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

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 URETEK 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 from using the URETEK Method.

Featured Projects

Marriott Parking Lot Repair Phoenix, AZ

Project Description

Client:   Marriott Hotel
Location:   Phoenix, AZ
Project Summary: Parking garage ramp with 3″ Settlement
Year Completed:   2014

A large, heavily reinforced parking garage ramp slab had settled approximately 3″. Removal and replacement of the slab was unacceptable due to the cost and the high disruption factor to the parking garage traffic. EagleLIFT was chosen for a number of reasons, such as a 15-minute curing time, virtually no disruption to vehicular traffic, and a project cost that was approximately 50% less than removal and re-pouring of the slab.

The Solution

LOW COST FOUNDATION REPAIR METHODS IN PHOENIX

EagleLIFT, Inc. drilled small 5/8” holes (size of a penny) and injected the patented polymer resins, which expand and lift the settled areas in a matter of minutes. Once injected, the resins expand to 20 times their liquid volume and create an extremely controllable lifting force of approximately 5 tons/sq.ft. Once the resins had compressed and densified the sub-grade, the ramp slab was lifted all the way back to its original elevation. The image to the left shows the settlement that had taken place.

The Results

EagleLIFT, Inc. was able to lift the sunken slab back to its original elevation in approximately 2 hrs total. The structural resins reach 90% of their compressive strength within 15 minutes, allowing for immediate use of the slab after treatment. The slab was lifted almost 3” in altogether, with the final work pictured to the right. The reason for the accuracy is that the URETEK 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 from using the URETEK Method.

Featured Projects