The roadway and concrete curb of the Hirschgrundbrücke is completed and is just a question of time before the approaches on both ends (the park side to the south and the castle side to the north) are constructed. With rainy weather we’ve been having, typical of fall weather here in Saxony, it would not be surprising if we have another delay and workers have to wait until they are added, together with the railings.
Furthermore, the concrete facade, which youu can see in this pic sandwiched between the scaffolding and the concrete, is almost finished as well. The facade, as mentioned in a previous post, is broken up stone that had been on the original structure before it was demolished in July 2018. In this pic, the is about a meter’s worth of layering left before the bridge is like its previous form. And this will lead us to the following question:
When will the scaffolding come down so that we can finally see the finished product? We know it will open to pedestrians in November, but we’re getting anxious to see her in use again. 🙂
130-year old historic bridge relocated to highway depot. Relocation to new place to be determined.
ERFURT (GERMANY)- The days of one historic bridge have been numbered- at least at its now former location. The question is where to find a new home for it. The Riethbrücke used to span the River Gera at Riethstrasse, near the sports complex in the northern suburb of Rieth. Built in 1890, the curved Parker pony truss span was first placed over the Flutgraben Diversion Canal just south of Erfurt Central Station before it was relocated to its present site in 1912. For 107 years, it had served car and bike traffic with no problems.
Sadly though, the bridge is no more at this location. As recently as today, crews transported the truss structure to its new home, which is the highway depot near Bindersleben, west of Erfurt. Crew had cut the 25 meter (75 foot) long and six meter (18 foot) wide bridge into two parts the day before, so that it can be transported easily along the main highways leading to its destination. The bridge had to make way for a new steel structure, whose features will be similar to the truss span. That bridge will be opened in time for the German Garden and Horticulture Show (Bundesgartenschau) in 2021. The old truss bridge had become functionally obsolete as weight, width and height restrictions were imposed on the structure for close to a decade.
The bridge is still protected by the heritage laws in Thuringia and crews are currently figuring out where to relocate the bridge and how to repurpose it for recreational use. It is clear that the bridge will need to be completely rehabilitated due to years of rust and wear, especially on the lower chord. The bridge had not seen any major rehabilitation jobs done during its time at its first two locations. As it will be at the highway depot, crews will have a chance to examine the bridge to determine what needs to be done to improve it. At the same time, the search for a new home will commence so that the bridge can be reinstalled and reused again.
The question is where to find its next home, which will be its fourth (counting its stay at the depot), so that it can live on for another century?
The Gera Bike Trail, which used to form an intersection with the Riethbrücke- forcing people to walk their bikes across the street, will run under the new bridge when it is built. The bike trail starts at Schmücke near Ilmenau and after passing through Erfurt, joins the Unstrut Bike Trail at Gebesee, a length of 75 kilometers.
This is the fourth bridge built in Erfurt since 2018. Three more structures are replacing old and obsolete ones, all of them in the north of Erfurt: one at Strasse der Nationen spanning the highway (in construction- overpass to be torn down in 2020), one at Gispersleben (through arch bridge completed in June 2019), and one at Warschauer Strasse near the Riethbrücke (span to be replaced in 2020).
History of the Riethbrücke can be found in the Tour Guide on the Bridges of Erfurt, under the part on the city’s outer skirts. Click here to view and enjoy the other five parts of the tour. Please note that updates will be made on the city’s bridges in the future.
Lansing, Michigan- Entries are still being taken for this year’s annual Iron and Steel Preservation Conference. The two-day event will take place on Friday and Saturday, October 18-19 at the Lansing Community College West Campus, located at 5708 Cornerstone Drive in Lansing. With a couple exceptions, this conference has been held annually and focuses on welding and other industrial techniques, using historic bridges as examples, as the state has many of them still in use, a third of which have been credited through the technical expertise of those who have participated in the workshop and has done a lot of work with historic bridge preservationists and welding experts.
The events on each day will be from 8:00am to 5:00pm. According to the coordinator, Vern Mesler, the Conference will feature the following:
Day One of this conference is primarily lecture, and Day Two participants will have opportunities to see Demonstrations of actual preservation techniques and have hands on learning opportunities.
Day 1 – Speaker’s Forum: Presentations on the rehabilitation work recently completed on Michigan’s Cut River Bridge on U.S. Highway 2 in the Upper Peninsula by Michigan Department of Transportation personnel who were directly involved in the rehabilitation work. (Lloyd Baldwin, cultural and historic resource coordinator for MDOT, will lead these sessions from the initial planning stages to the completion of the rehabilitation work.)
Presentations on issues related to riveted and bolted connections and on the damaging effects of pack rust on metal structures. Presentations on the role of riveting in new construction and design.
The presenters at the Friday event:
Lloyd Baldwin, Cultural and Historic Resource Coordinator (MDOT)
“Cut River Bridge Rehabilitation”
Andrew Zevchak & Mario Quagliata (MDOT)
“Bridge Rehabilitation Design Overview”
Christopher Garrell, PE (AISC)
“Exploiting the Resiliency of Built-up Steel Members”
Robert J. Connor, PhD (Purdue University)
“Research and Evaluation of Pack-out Corrosion in Steel Built-up Members at Purdue University”
Steve Howell, Ballard Forge
“Hydraulic riveting introduction”
Steve Howell and Lansing Community College Staff
“Hydraulic Rivet Demonstration”
Day 2 – Hands On Demonstration: The experienced staff of craftsmen at Lansing Community College will demonstrate electric arc welding processes, braze welding, and an introduction to the industrial rivet process (both field riveting and shop hydraulic riveting).
The event is open to all who are interested in the profession of welding and/or preservation of historic bridges and workshop participants will experience the use of the aforementioned welding demonstrations and other industrial processes during hands-on sessions and learn how these processes are used in the preservation of historic metals and new construction. One of the key centerpieces of this conference will be the Cut River Bridge along US Hwy. 2, which had recently undergone extensive rehabilitation using these welding techniques that will be presented at the conference (for more on the bridge, please click here).
Breakfast and lunch will be provided for both days. Participants will need to book their own lodging accomodations. For more information and to register for the event, please click on the link below, which will lead you directly to the conference website and registration page: