California Water Service Generator Building Slab Lift

OCT+18+pics+(1)

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

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

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

Apartment Building Foundation Repair – Sunnyvale, CA

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

Fair Oaks West 6

Project Challenges

Client:   GE Construction
Location:   Sunnyvale, CA
Project Summary: Apartment foundation repair due to Minor settlement of partially submerged parking garages built in 1970s

The Fair Oak West Apartments are located within the Santa Clara Valley, which is a broad alluvial plane between the Santa Cruz Mountains to the southwest and west, and the Diablo Range to the northeast.  The San Andreas Fault system, including the Monte Vista-Shannon Fault, exists within the Santa Cruz Mountains and the Hayward and Calaveras Fault systems exist within the Diablo Range.

The property owners decided to have seismic upgrades added to all sixteen structures in the complex, and helical piles were selected as the best choice for the upgrades with both vertical and battered piles being included in the upgrade design. Each apartment building was constructed over a partial subterranean parking level and consist of three levels of wood-framed structures.  Some relatively minor settlement had occurred in three of the buildings since they were originally constructed in the 1970’s.

Soil borings were conducted in several locations across the site, and boring depths ranged from 6.5 to 40 feet.  Variable amounts of sand and medium dense clayey sand was found along with some areas of silt and gravel.

Solutions and Results

All piles were installed inside the garage level, and the maximum head clearance was 6.6 feet, which necessitated the use of small footprint installation equipment and shorter helical pile section lengths.

Fourteen of the buildings had (4) bays each, and (48) piles were installed in each of those buildings.  Two of the buildings had (2) bays each, and (24) piles were installed in each of those buildings.  Each bay had (8) vertical piles installed along with (4) battered piles.

The helical piles manufactured by MacLean Power Systems – Civil Products Group were all 1.75” Round Corner Square Bar.  The leads used for the vertical piles had 8”,10”,12” helix bearing plates, and the required load was (40) kips.  The leads used for the battered piles had two configurations – 10”,12”,14” and 14”,14”, and the required load was (70) kips.  One tension load test on a battered pile was required and completed successfully.  New construction pile caps were connected to each pile.

EagleLIFT crews completed work for each building in one week, and the entire project was successfully completed in sixteen weeks.

Our Projects