Working on the rehab of a bridge built in 1960, and trying to figure out why a certain detail was used, I went online and bought a copy of the 1957 edition of the standard bridge design specifications that would have been used for the design. As you can see in the photo, it’s quite a bit thinner than the current edition. It’s refreshing to read a design document written by engineers rather than academics.
This video is a time-lapse showing the 15-hour operation of floating and lifting into place onto temporary piers a pre-assembled 727-foot (222-meter) span of the new Milton-Madison Bridge over the Ohio River.
The superstructure, which when completed will have four spans totaling 2,427 feet (740 meters), is being assembled on temporary piers next to the existing bridge. Once assembly has been completed, the existing superstructure will be demolished and the new superstructure will be slid (all 2,427 feet of it!) from the temporary piers into its final position onto the existing piers, which are being re-used.
This will be the largest bridge slide of this type ever attempted.
I’m posting about this, though, not because of the fascinating technical achievement, but because the Wall Street Journal article about Murray Johnson, the engineer supervising the project, includes this line:
Mr. Johnson’s innovation was spawned by salmon.
After that, I couldn’t really focus on the rest of the article.
A Bridge in Israel will be constructed of recycled shipping containers.
Based on the idea of resuse, the competition winning proposal for the Econtainer Bridge by Yoav Messer Architects will be the gateway to Arial Sharon park and will connect Lod road (route 461 which leads from east Tel Aviv to Bnei Atarot village) straight to Hiriya mountain in the center of the park. The 160-meter long bridge will be used by pedestrians, bicycle riders, and special vehicles that will function as shuttles to transport the public from the parking areas into the park itself.
Time Lapse: Bay Bridge New East Span, 2009 — 2012
I’ve been out of the loop on this here on the east coast, but it appears that Caltrans and the Sacramento Bee are going toe to toe over the Bee’s reports about questionable testing and monitoring during the Bay Bridge construction.
The Aizhai Bridge, the longest and highest tunnel-to-tunnel bridge in the world, just opened in China on March 31.
With a main span of 1,146 metres (3,760 ft) and a deck height of 350 metres (1,150 ft), it is the sixth-highest bridge in the world and the world’s twelfth-longest suspension bridge.
You emerge from a tunnel directly over a kilometer-high gorge, drive 3.7 kilometers over said gorge, and then immediately plunge into another tunnel at the other end.
The bottom line: The U.S. has 18,000 bridges that could collapse without warning, requiring more costly inspections while funding becomes scarce.
Cantilever trusses have for the most part been supplanted by other forms of construction such as cable stayed and suspension techniques. The designers decided on the truss form for this bridge because its location on the approach to Haneda airport meant that towers couldn’t be used.
The bridge has become known as The Dinosaur Bridge because of the trusses’ resemblance to two dinosaurs facing off against each other. I don’t really see it myself, but then I don’t come a land that lives under the ever-present threat of an attack by Godzilla.
Photo Credit: 多摩に暇人
I missed this when it first made news a few months ago. Some 50-odd previously unknown photos of the construction of London’s Tower Bridge, taken circa 1892, were found by a guy who saved them from a skip at the site of a building renovation. The historian to whom they were first shown reports being gobsmacked upon first seeing them.
More photos and story at The Daily Mail.
[A skip is a large open-topped waste container designed for loading onto a special type of lorry. Instead of being emptied into a garbage truck on site as a dumpster is, a skip is replaced by an empty skip (or no skip at all) and then tipped at a landfill site or transfer station. Source: Wikipedia]
[A lorry is a truck. Source: Wikipedia]
[Gobsmacked is British slang meaning astonished. Source: Dictionary.com]
Caltrans contractors have started running the cable for the new Bay Bridge, a process that will take months to complete.
This week, Caltrans contractors begin stringing the gargantuan cable, made up of 17,399 steel wires that are 5 millimeters wide and nearly a mile long. Each one is strong enough to support the weight of a military Humvee.
When it’s finished, the 2.6-foot-wide cable will weigh 5,291 tons. It will be made up of 137 strands, each of which in turn is made up of 127 high-tensile steel wires, according to Caltrans.
That’s one big-ass cable.