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New Guinness Record for Largest Concrete Pour

Noel J. Hargrave-Thomas, P.E. Principal/Project Consultant

Noel J. Hargrave-Thomas, P.E.
Principal/Project Consultant

Construction crews in Los Angeles set a new world record for a continuous concrete pour, as the foundation for the New Wilshire Grand building (tallest building west of the Mississippi) was laid on Feb. 15. Read More>

This concrete pour is impressive, but from a technical point, the challenge is how do you cool it?  That required over 19 miles of cooling tubes to lower maximum temperatures, and manage differential temperatures, preventing cracking. Read More>

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Allen Park High School

Allen Park, Michigan

The Allen Park School District was adding 800,000 square feet of new construction to the High School, including a 2-story 650-seat auditorium with a full orchestra pit and a new natatorium. One of the district’s first steps was to hire G2 to perform a geotechnical investigation and to develop foundation recommendations.

Fast Facts

Project Owner

Allen Park School District

Scope

800,000 square foot addition

G2 Services Provided

Geotechnical Investigation/Engineering
Construction Engineering

Challenges/Solutions

  • The footprint included a shallow surface “crust” of stiff cohesive soil underlain by soft “toothpaste” consistency clay.
  • To address the site conditions, G2 designed deep foundations consisting of 90-foot long, 100 ton steel H-piles bearing on the underlying hardpan and bedrock, confirming capacity with a pile load test.
  • Adjacent structures needed to be protected during construction, including the existing school, a 50-foot deep sewer interceptor, and residences.
  • G2 performed ground vibration investigation and monitoring to evaluate and monitor vibration levels to ensure that no damage was done to nearby structures.
  • G2 also performed noise monitoring to verify compliance with local noise ordinances for surrounding residential neighborhoods.

Smart. Results. Fast. G2 designed an efficient foundation system to address subsurface construction hurdles, and carefully monitored noise and vibration to prevent impacts to the nearby community and keep the project on track.

The Courtyards

Ann Arbor, Michigan

The Courtyards is a student housing development near the University of Michigan campus with three, four-story buildings including a two-story underground parking structure. The overall property is long and narrow, which provided limited construction access and difficult construction staging. G2 designed an earth retention system to allow construction traffic to continue while the below grade portions of the development were underway.

Fast Facts

Scope

Student housing development

G2 Services Provided

Geotechnical Engineering
Temporary Earth Retention Design
Construction Engineering

Challenges/Solutions

  • Poor soils were encountered in the north half of the north building footprint, while the soils under the south half of the north building were compact.
  • G2 recommended a foundation design incorporating two different soil bearing capacities, utilizing shallow foundations where suitable bearing soils were encountered and extending foundations deeper where poor soils were encountered.
  • The overall property is a long, narrow site with limited property access from the north and south, and construction traffic access along the west property line – resulting in difficult construction staging.
  • G2 provided an earth retention system design along the west and north sides of the underground parking structure excavation to allow construction traffic to continue while constructing the below grade portions of the development.

Smart. Results. Fast. G2 minimized costs by customizing the foundation design to address varying soils conditions, and expedited the project schedule by designing a retention system to eliminate construction access constraints.

Shelby Macomb Medical Mall

Shelby Township, Michigan

The Shelby Macomb Medical Mall  is located on a highly visible plot of land at the corner of a major intersection. Construction included a 160,000 square foot, three-story medical office building with a full basement on a footprint of only 40,000 square feet.

Fast Facts

Services Provided

Geotechnical Engineering
Foundation Design
Construction Engineering

Challenges/Solutions

  • Subsurface soils consist of soft blue clay, requiring a deep foundation system.
  • G2 designed an auger cast foundation system consisting of 325 24-inch diameter augercast piles extending 20 feet below the basement elevation.
  • Groundwater was encountered during excavation operations and a clay dike was recommended to seal off groundwater into the basement excavation.

Midfield Terminal Parking Garage

Romulus, Michigan

The Detroit Wayne County Metropolitan Airport constructed the Midfield Terminal Project which included construction of a new 11,500 square foot parking garage. The entire structure is approximately 1,600 feet long, 240 feet wide, and 10 stories tall, 3 stories of which are below grade. At the time of completion in 2001 it was the largest parking structure ever built at one time.

Fast Facts

Project Owner

Wayne County Airport Authority

G2 Services Provided

Geotechnical Engineering and Construction Engineering

Challenges/Solutions

  • Value engineered 16-inch diameter, 200 ton capacity augercast pile system to replace the designed steel driven piles, resulting in a quality, high capacity, and cost effective foundation system.
  • The augercast piles were the highest capacity ever used locally. G2 developed a rigorous load testing program to verify the capacities of the piles, including a combination of load tests: compression, tension, and lateral load tests.
  • Low strain integrity testing was performed on each augercast pile to confirm no discontinuities were present.

ITC Headquarters

Novi, Michigan

G2 provided construction engineering services during construction of this new $60-million headquarters, including site work and utility construction, foundation construction, structural steel, and bituminous and concrete paving.

Fast Facts

Project Owner

ITC Holdings

Scope

Six story, 188,000-square-foot headquarters with a control center and an attached two-story parking deck within the 86-acre site

G2 Services Provided

Geotechnical Engineering
Construction Engineering

Challenges/Solutions

  • During the geotechnical investigation, the team encountered a large peat and marl deposit within the proposed access drive alignment.
  • G2 performed a “rolling surcharge” to squeeze out the peat and marl. The rolling surcharge method consisted of excavating in front of a 30- to 35-foot-high sand pile while moving across the roadway alignment. The peat and marl squeezed out and was removed from the work area. The remaining surcharge pile was used to support the roadway.

Smart. Results. Fast. G2 designed and implemented an innovative geotechnical solution to eliminate challenging subsurface conditions, maintaining project schedule and budget.

Emergency Communication System

Charles City, Virginia

The project included installation of a monopole telecommunications tower to support the Richmond Area Microwave Interoperability System (RAMIS) emergency communications network in Charles City County, Virginia. The high speed communication system is essential for the safety and welfare of the people and links together the State Emergency Operations Center and 16 other jurisdictions for emergencies such as hurricanes, fires, tornados, and potential terrorist activities. The county is a host for the Surry Nuclear plant.

Fast Facts

Scope

Installation of a monopole telecommunications tower

G2 Services

Phase I Environmental Site Assessment (ESA), National Environmental Policy Act (NEPA) Review, State Historic Preservation Office (SHPO) Submittal and Environmental Assessment (EA)

Challenges/Solutions

  • The proposed tower site was located within an area on the National Register of Historic Places.
  • The NEPA Review determined the project had an adverse visual effect on historic properties.
  • G2 developed a memorandum of Agreement (MOA) between the tower owner/Charles City County, the FCC, and the Virginia SHPO to mitigate construction of the tower.
  • The successful completion of the MOA resulted in the construction of the tower under the National Preservation Act – Advisory Council on Historic Preservation’s and Federal Communications Commission’s implementing regulations.

Connor Creek CSO Control Improvements

Detroit, Michigan

G2 provided geotechnical engineering services for Connor Creek CSO (PC-739), a Detroit Water and Sewer Department Wastewater Collection System construction project in Detroit, Michigan. The project provided for an 80-foot wide by 300-foot long retention basin to provide storage capacity of sewerage overflow. The overflow is stored in the basin until the wastewater collection system is able to receive the overflow, thereby stopping direct discharge into the Detroit River.

Fast Facts

Project Owner

Detroit Water and Sewer Department

Scope

80-foot wide by 300-foot long retention basin

G2 Services Provided

Geotechnical Engineering, Geotechnical Instrumentation and Monitoring, Temporary Earth Support Design and Slope Stability Evaluations

Challenges/Solutions

  • Extensive excavation into soft clay deposits resulted in potentially unstable excavation bottom.
  • G2 provided instrumentation that allowed for early warning detection of basal instability.
  • G2 provided instrumentation to monitor structural loads in the earth retention system to monitor actual loads and compare to the design loads anticipated.

 

Belle Isle CSO Control Improvements

Detroit, Michigan

G2 provided engineering services during construction of a new 90 foot by 45 foot retention basin for the control of sewer overflow conditions on Belle Isle in Detroit, Michigan. In addition, a new wet well was constructed adjacent to the existing pump station that required approximately 20-foot deep excavation in a 20 feet by 26 feet footprint.

Fast Facts

Project Owner

Detroit Water and Sewer Department

Scope

90-foot wide by 45-foot long retention basin

G2 Services Provided

Geotechnical Engineering, Vibration Monitoring, Pile Load Testing, Temporary Earth Retention Designs and Geotechnical Instrumentation

Challenges/Solutions

  • The primary concern was the deep excavation into soft clays resulting in excavation bottom instability.
  • G2 performed extensive geotechnical investigation to capture in-situ soil strengths, and implemented staged excavation techniques to provide a stable and efficient excavation system.
  • G2 provided geotechnical instrumentation including inclinometers, vibration monitoring and settlement markers to provide for early warning systems for any bottom instability hazards.
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Oakland County Stream Bank Protection

Oakland County, Michigan

G2 provided geotechnical investigation services for several Oakland County Stream Bank Projects in the Village of Bingham Farms, Michigan to construct erosion protection systems.  Water mains and sanitary sewer lines near many of the sites are threatened by on-going erosion. G2 identified  subsoil conditions and assisted in development of corrective systems that are compatible with the soil conditions and the restricted access to the construction sites.

Fast Facts

Project Scope

Construction of erosion protection systems

G2 Services Provided

Geotechnical Engineering
Construction Engineering

Challenges/Solutions

  • Difficult access to the construction sites limited the choices for erosion protection.
  • G2 selected erosion protection systems to achieve the desired flow improvement characteristics.
  • G2 designed temporary earth support systems to provide protection to nearby utilities during stream bank improvement construction.

I‐94 and Sargent Road Interchange

Leoni Township, Michigan

 

 

The I-94 and Sargent Road Interchange is a key transportation route for this area – especially when Michigan International Speedway is holding a race or the University of Michigan is hosting a football game. When MDOT began considering a major reconstruction of this area, the team understood careful planning would be required to keep traffic flowing.  What was not so apparent was how subsurface conditions would increase project complexity.

Fast Facts

Project Owner

Michigan Department of Transportation

Project Scope

Replacement of the Sargent Road Bridge over I-94, replacement and/or realignment of the ramps to and from I-94, and realignment of 3,200 feet of Sargent Road

Services Provided

Geotechnical Engineering, Design and Construction Assistance

Challenges/Solutions

  • The realigned segment of Sargent Road and portions of the realigned ramps (with embankments up to 24 feet high) were to be constructed through significant wetland areas with up to 6 feet of peat, muck and organic silt at the surface, underlain by up to 39 feet of loose granular soils.  Construction could not proceed without treating these soils.
  • G2 performed extensive engineering analyses to identify methods to accelerate and monitor embankment settlement while maintaining stability. The soft and organic soils were too deep and widespread to be cost effectively removed by conventional undercutting or rolling surcharge methods.
  • G2 developed a staged embankment construction plan incorporating a drainage/stabilization blanket and wick drains to accelerate consolidation of the compressible soils. Instrumentation systems were installed to record how much settlement was occurring during embankment construction to avoid causing slope instability by overstressing the underlying weak soils.
  • G2 recommended additional surcharge fill over the embankment fill to further accelerate settlement and over-consolidate the soils to facilitate earlier construction. G2 prepared all the Special Provisions related to subgrade undercutting embankment and surcharge construction, wick drain installation and geotechnical instrumentation.

Smart. Results. Fast. Embankments were constructed in less than 3 months, enabling the remainder of construction to proceed on schedule with minimal disruption to I-94

Smart. Results. Fast.

Times are tight.  There’s no slack in the schedule, and no money to burn.  This is our world.

Our geotechnical, geoenvironmental and construction engineers have delivered hundreds of telecommunications, land development and civil infrastructure projects for two decades.

Facing a demanding project?  Need to find a way to reduce project costs?  Looking for a competitive advantage?

Look to G2 Consulting Group.