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Crux Foundations Recognized by ISM & DFI

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Sunrise Powerlink

Crux was the recent recipient of three industry awards for design-build foundation work and the introduction of an innovative steel pile cap design on the Sunrise Powerlink Project.  This included the DFI Outstanding Project Award, the C. William Bermingham Innovation Award, and the first-ever World Cup of Micropiles.  All three awards had a different set of criteria and were selected from separate applicant pools.

The project featured 3,732 micropiles installed at 234 of the total 421 lattice tower sites, and was the inaugural use of Crux’s patented steel micropile cap.  All foundation equipment and components were transported by helicopter to accommodate for environmental regulations and rugged, mountainous terrain.  In total, more than 99,000 lineal feet of pile was installed in a condensed ten and a half month construction schedule.  The introduction of the steel pile caps reduced onsite construction time by an average 64%, significantly contributing to the on-time completion of the project.

Click below to read the DFI press release:

World Cup

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Micropile World Cup

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ISM World Cup
Crux’s micropile foundation work on the Sunrise Powerlink Project has been selected as the North American representative for the International Society of Micropile’s Micropile World Cup.  The project will be up against selected projects from South America, Europe and Australia for the Micropile World Cup title at the 12th International Workshop on Micropiles in Krakow, Poland June 11-14.

Sunrise Powerlink Micropiles

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Design begins for California pumped‐storage

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The Sacramento Municipal Utility District (SMUD) has awarded an Owner’s Engineer services contract for preliminary design and construction services on the Iowa Hill pumped storage project to a team led by Jacobs Associates.  As part of the Jacobs team, Crux has completed both vertical and horizontal exploratory borings to depths of up to 1,500 feet and lengths of up to 2,000 feet.  Crux expects to return to the project in the coming year to provide additional drilling and in-situ testing services.

Pumped-storage hydroelectric project

GeoDrilling International Feature

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Crux’s specialty foundation work on the Troy Meadows transmission segment was recently featured in GeoDrilling International’s May 2014 issue.  Click below to view the full article.

GeoDrilling International Feature 

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Crews trying to learn extent of Wanapum Dam crack

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Crews trying to learn extent of Wanapum Dam crack

Crux is providing challenging access exploratory drilling services at the Wanapum Dam in central Washington.  A crack was discovered on February 27, 2014 and the geotechnical exploration program is intended to provide more information regarding the extent of this crack.

Six borings have been completed to-date, and Crux crews expect to drill a minimum of twenty by the conclusion of the project.

Exploration drilling started at proposed dam site

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Crux crews are onsite near Whiteriver, AZ to complete core drilling and sampling at the proposed Miner Flat dam site. Thirteen angled core holes and a total of approximately 3,365 feet of drilling will be completed. Access to borings is being achieved through a combination of track vehicle and helicopter, and core recovery in the area has proven challenging in the past. All operations are taking place on White Mountain Apache Tribe lands and require close coordination with tribal representatives.

Geotechnical Exploration Drilling

If constructed, the dam will cross the north fork of the White River, measuring approximately 160 feet high and with a crest length of approximately 450 feet. The proposed project, including the dam, as well as a storage reservoir, a pumping plant, treatment facilities, and a distribution system, would provide long-term water stability and reliability to the Fort Apache Indian Reservation.

Crux is performing permeability testing throughout drilling operations and Vibrating Wire Piezometers will be installed in eight of the thirteen borings. Downhole imaging will be completed in select borings by Crux Oriented Borehole Logging (COBL). Drilling operations commenced on March 7, 2014 and Crux expects to be onsite until June 2014.  Continue reading →

Company Profile Featured in Piling Canada Magazine

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Piling CanadaA History of Problem Solving 

When Crux first began installing micropiles in 2002, the company was already known for providing difficult-access geotechnical exploration services throughout the western United States for tunnel, dam, highway and slope stabilization projects, including the Hoover Dam Bypass.  Crux initially utilized micropiles for structure foundation support and slope stabilization before adapting the technology as a foundation alternative in the electrical transmission market. Micropiles provide the ability to install a high capacity deep foundation system in remote or environmentally sensitive locations, explained Tunison, Crux’s Vice President of Operations.

“Micropiles are replacement piles constructed using high-strength grout and steel, and can be installed using lightweight equipment,” he explained.

In 2004, Crux began construction on the 57-mile-long Swan Lake-Lake Tyee Intertie between two hydroelectric projects in Southeast Alaska.  This was the first project of its magnitude to use helicopter-supported micropile foundations exclusively for its whole alignment, relying on Crux’s customized drills, skilled helicopter support, and specially trained drillers.

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Micropiles Installed in New Jersey Wetland

Micropiles installed in new jersey wetland

Crux recently provided micropile foundation EPC services within a Priority Wetland for Public Service Electric & Gas Company’s (PSE&G) Susquehanna-Roseland Electric Reliability Project.  The specialty deep foundation was selected to accommodate challenging subsurface conditions and access constraints associated with the protected area.

The full alignment will span from Berwick, Pa. to Roseland, N.J., with a 1.5-mile segment traversing the Troy Meadows area in Morris County, New Jersey.  Micropile foundations were selected for all seven steel pole structures within the wetland due to standing water and other permit access restrictions.  Prime contractor KH&M (a joint venture between Kiewit and Henkles & McCoy) was permitted to mat a roadway to one structure, but the remaining six required helicopter support for materials and equipment.  Micropiles are lightweight elements and can be installed using lightweight equipment, making them conducive to these types of restrictions.

In order to minimize impacts to the wetland and facilitate construction activities, a unique closed cell cofferdam was employed at each structure site.  This setup provided a stable platform for equipment in soft soils and groundwater, contained drill spoils from entering the wetland, and acted as a form for concrete placement.  A rotating drill carriage and micropile drill were set on top of the cofferdam to install micropiles in a battered array.  Micropiles proved to be an efficient choice to bridge through extremely soft soils and reach underlying bedrock, which varied in depth between 60 feet to 115 feet below ground level.

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Northwest Transmission Line: Powering Growth

Building & Construction Canada: Powering Growth
Affiliated publications Building & Construction Canada and Energy & Infrastructure Magazine feature an article in their Winter 2013 issues on the construction of the Northwest Transmission Line (NTL).  The article, titled “Powering Growth,” discusses various challenges associated with construction of the alignment, located in Northern British Columbia.

Valard Construction, a Quanta Services company, teamed with Burns & McDonnell to lead the 214-mile EPC project.  Crux worked with Valard to provide design-build foundation services for seven lattice tower structures on the alignment located in particularly challenging terrain.  Once completed, the NTL will connect remote areas of the province to the grid and pave the way for potential industrial developments.

 

Read the full article to learn more about the NTL and see the Vendor Focus column on page 24 for information regarding Crux’s alternative foundation work.

 

Photo Gallery: Micropiles as a Foundation Alternative

As a followup to the Burns & McDonnell sponsored Advanced Technologies Webinar Series, Transmission & Distribution World is featuring related photo galleries on their website.  Visit the Micropiles as a Foundation Alternative gallery to view project photos where micropiles were utilized to solve a number of challenges, including access restrictions, environmental regulations, low overhead clearance and challenging subsurface conditions.

Transmission & Distribution World

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Technical Papers

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