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Suspended Platforms – Deception & Canoe Pass + San Rafael Bridge

December 27, 2022

Designing a suspended platform system presents unique challenges not commonly seen in other lines of engineering, which requires a different kind of in-depth plan behind each design. Like a well-constructed spider web, suspended platform systems typically consist of efficiently placed cables and chains working both together and against one another to create a balanced system…

Willamette Water Supply Project

The Willamette Water Supply Project is a $1.6 billion water conveyance pipeline project in Oregon.  Pipeline construction began in 2016, and when substantially complete in 2026, will provide fresh drinking water, capable of meeting current and future needs, while ensuring resiliency, protection of public health, and quick recovery during natural disasters and emergencies.  Improvement of...

California High-Speed Train – Tule River Viaduct

DHC does not shy away from high profile projects, and in the state of California, High-Speed Rail is among the biggest and most anticipated projects the state has seen in decades. With the introduction of a high-speed rail system, the state could finally feel a little smaller, although construction of the rail has been riddled...

1850 Alice – Overcoming Challenges

Washing windows. It sounds straight forward – grab a squeegee, a bucket of soapy water, and start washing. Now how about washing windows on the outside face of a 12-story building? Things tend to get a little more complicated.   The best time to implement a safe method of washing windows for a large building...

Engineering the Pan American Games

The Pan American Games is a multi-sport competitive event preceding the Summer Olympic Games by 1 year, every 4th year. Each event hosts thousands of the top athletes from the nations of the North and South American continents. Spectators flock to see the various events and the major cities that host these events must be...

The EPIC Phase II

DHC had worked with MDM on a 20’ cantilever design through Covid. There was a little back and forth, but we came up with a clean design that worked structurally and was feasible for that particular job. Fast forward a few weeks and we get a call that went something like this: “Hey do you...

Tunneling Engineering 101

At DHC, we try our best to be the construction engineers that you can come to for any design on a construction site. So, when a contractor comes to us to design a jack and bore shoring system, we can help you make sure your casing and carrier pipe are installed safely. From start to...

Bay Bridge Demolition – Pier E2

Dominating the Bay Area landscape since 1933, the Oakland-San Francisco Bay Bridge has stood as a monument to depression-era construction and as an iconic gateway to the port of Oakland for over a quarter of a century. But even icons can need some refurbishment, and when a new Eastern Span was completed in 2013, it...

Historic Bridgeport Covered Bridge

D.H. Charles Engineering brought home two SAIA awards this year for our work completed on the historic Bridgeport Covered Bridge – the Structural Shoring Project of the Year and the Industrial Collaborative Project of the Year. It was a challenging, yet rewarding project to be a part of, and it was the team of engineers...

Bay Bridge Rebar Cage

Such is the evolving world of construction that each time we pick up the phone at DHC, we expect there’s a chance we’ll be asked to do something we’ve never done before, or to support a construction practice or method that is pushing the boundaries of what has been done in the past. It is...

High Roller

America’s fascination with Ferris Wheels was born at the 1893 World’s Fair when George Washington Gale Ferris Jr unveiled his masterpiece at 264’-tall. Roughly 120 years later and at nearly twice the height of the original, the High Roller Ferris Wheel was completed as the world’s tallest, towering 550’ above the Las Vegas Strip. It...

DHC’s Newest Engineers

DHC is thrilled to welcome our new engineers to the team! Meet 3 of DHC’s newest by reading through the Q&As below. Christine Strong (CMS), Chris Poston (CAP), and Cesar Cuevas (CC) introduce themselves and share about their pathway to engineering, their perspective on DHC culture, and more!   Q: What lines of work have...

Big Creek Bridge Restoration

Big Creek Bridge is an open spandrel concrete arch bridge on California’s coast in Monterey County. The bridge was built with funding from the New Deal in the 1930’s, ultimately opening in 1938. Measuring 589 feet long and 24 feet wide, the bridge spans 65 feet above Big Creek near its mouth at the Pacific...

Award Winning Shoring Key to Success

In recognition for the successful collaboration and the innovative shoring design, this project was awarded the 2020 Scaffolding & Access Industry Association (SAIA) Shoring Project of the Year.   Originally built in 1962, Climate Pledge Arena (originally known as Key Arena) is located in the heart of the historic Queen Anne district of Seattle. To take...

Chicago Office Opening

D.H. Charles Engineering, Inc. has a long-standing tradition of servicing clients in the State of Illinois since obtaining our IL SE license, and has developed close relationships with contractors, IDOT and CDOT OUC over the past twenty years working in the area.  Even though we’ve felt confident we could continue to meet the needs of our customers, as...

Temple Galaxia – Burning Man

Burning Man is an annual gathering held for one week every year in the harsh and unforgiving Black Rock Desert of Nevada where a community comes together to construct a temporary city filled with art installations and camps dedicated to radical self-expression and self-reliance. Participants are expected to be collaborative, inclusive, creative, and connective and...

Paseo Colorado

In 2017, DHC was contracted by Commercial Scaffolding, Inc. to provide engineered designs for the Paseo Colorado outdoor mall, in Pasadena, CA. DHC’s scope of work consisted of the structural shoring of existing columns and beams to allow for the installation of (4) new shear walls and shear wall foundations on the P2-lower parking level....

Engineering Solutions – Enclosed Scaffold on High Profile Bridges

Enclosed scaffold systems on bridges can expose some of the most complex erection and engineering challenges to face the scaffold industry today.  Extreme heights, elaborate bridge profiles, severe wind speeds and other complications regularly drive scaffold contractors and engineers to develop state-of-the-art solutions.  The following three high-profile bridge projects may have faced similar design obstacles,...

Support Under Distress

The 6.0 magnitude Napa Earthquake struck on August 24, 2014,  and caused substantial damage to many structures in this popular tourist destination.  DHC received many calls during the aftermath of the earthquake, as the damage was widespread and structures were in need of temporary support.  Bracing and shoring was deemed necessary for many building simply...

Steel Culvert Rehab

DHC has recently completed multiple designs of arch and elliptical shaped steel casings for culvert rehab projects for InfraSteel. Structural load and stress calculations on the new casing sections were performed and submitted, to prove that the steel segments can safely support the full intended loading of the existing deteriorated culverts. Once certified and approved by the...

NCSEA – Award

DHC is proud to have been awarded the National Council of Structural Engineers Associations 2015 Excellence in Structural Engineering Award, for work on the Ballard Drive Bridge, in Seattle, WA.   Click here to read published article on the project.   The Ballard Drive Bridge is one of the many historic bascule bridges located in the...

DHC Expands to Seattle Area

After much planning and the steady encouragement of many of our customers, DHC is proud to announce the opening of an office in the greater Seattle area.  With main branches in Santa Rosa & San Diego, and satellite offices in Oakland & Sacramento, the Seattle location becomes the 5th for DHC.   This new office is being managed by...

Industry Leader – Guest Lecturer – UCSD

D.H. Charles Engineering, Inc. (DHC) was invited to be a guest lecturer for roughly 120 graduating seniors of the University of California San Diego (UCSD) Structural Engineering department.  With an established passion for educating the construction industry in engineering challenges and safety, DHC was more than happy to accept the invitation, and had the perfect...

SSPC – George Campbell Award

DHC is proud to have been awarded the Society of Protective Coating’s (SSPC) George Campbell Award, for work on the Fremont Bridge, in Seattle, WA.  This honor is bestowed as recognition of outstanding achievement in the completion of a difficult or complex industrial or commercial coatings project.   In an attempt to paint a clear...

Gaining Knowledge – Trench & Shoring Safety

The excavation shoring industry is consistently faced with the age-old challenges of working in unstable & changing soil conditions, managing groundwater, and protecting adjacent structures/utilities, while attempting to complete their work in a safe manner and remaining profitable.  With projects getting progressively larger and more complicated, coupled with laws and specifications outlining very strict design,...

SIAC – A Historic Challenge

As our nation’s buildings and bridges continue to age and deteriorate, contractors are regularly challenged with completing retrofit, painting, abatement and other upgrades, without overloading or damaging the existing structures.  With more and more federal, state, and local entities rewriting their specifications to put the structure evaluation and certification responsibility on the contractor, it has...

SAIA – Balancing Needs – A Bascule Bridge Story

Published in the September 2012 issue of SAIA   By Jasper Calcara, PE   If you can imagine the risks of two sumo wrestlers jumping on a child’s seesaw, you can start to visualize the challenges facing engineers on the Ballard Drive Bridge painting project.   The Ballard Drive Bridge is just one of many...

MD Brace System Aids Cast-In-Place Job Off Lake Michigan

By: Tommy Marciniak – SPECIAL TO CEG   Completing a cast-in-place project that measures 46 ft. (14 m) wide by 39 ft. (11.9 m) long by 35 ft. (10.7 m) deep near the shores of Lake Michigan is a challenging project in and of itself. Now add in the challenge of being in the middle...

Mega Brace Shoring Provides Unique Solution for Water Project

This article was originally published in Underground Construction Magazine in December 2010.   Projects requiring excavation are recognized as among the most dangerous in construction, and protecting personnel who must work in trenches and surrounding areas from cave-ins is a priority with life and death implications.   For small jobs, trench protection may be as simple...