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Vedder Bridge Replacement Design Build Project

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Vedder Bridge Replacement Design Build Project ASSOCIATION OF CONSULTING ENGINEERING COMPANIES | CANADA ASSOCIATION DES FIRMES D’INGÉNIEURS-CONSEILS | CANADA VEDDER BRIDGE REPLACEMENT DESIGN BUILD PROJECT CANADIAN CONSULTING ENGINEERING AWARDS 2018 INNOVATION Moving the 80-metre-long bridge across the river, without support on one end of the arch, posed an interesting construction-engineering challenge. The design-build team planned its construction by assembling the steel superstructure on site behind the north abutment and launching it in one piece from north to south across the river. KCB designed a temporary king post support system to support the bridge during installation. Using the king post, the bridge was picked up from its temporary supports and propelled across the river in one metre increments using hydraulic jacks on four travelling skid shoes. The After the new bridge was constructed and in critical part of the launch – the first 60 metres service, the same kingpost system was modified when the bridge was cantilevered over the river and reassembled to support the existing steel and unsupported at one end – was successfully truss bridge during demolition. The demolition completed in one day before a large audience of method has been designed to avoid all work Chilliwack residents. The final 20 metres of travel, within the wetted perimeter of the river. Once the involving several resets of the jacks to place the deck was removed, the kingpost was installed to end of the bridge on its permanent abutment, support the bridge from above the floor beams. was completed over the next few days. The kingpost system’s longitudinal launch girder The Vedder Bridge is believed to be the first was connected to the old bridge at the floor steel arch bridge in the world launched into place beam nodes. Tension was applied to the cables using a king post support system. Arches are to pick up the truss with temporary supports and normally not strong enough for the temporary retract the structure across the river in one meter loading conditions of launching. These challenges increments using hydraulic jacks on four travelling were met using an innovative combination of the skid shoes. The truss was then disassembled continuous longitudinal tie girders on the south on land. This innovative demolition method side span being used as a launching “nose”, eliminated any temporary supports in the river and localized reinforcement of the tie girders and reduced the risk of lead contamination through the temporary global support provided by the components falling into the river. Therefore, kingpost system. the project schedule and cost were significantly reduced. COMPLEXITY A fundamental goal in construction of the new bridge and demolition of the existing bridge was to avoid any work within the wetted perimeter of the river. This was important both from an environmental standpoint in protecting the important salmon river, and providing schedule flexibility as the fisheries windows for working in the river were very short. Safety risks in soils in a seismic construction were also reduced. Launching was event is expected at therefore chosen for the erection method. This the south pier location and method allowed all the steel bridge components horizontal movement of the soils to be assembled on the north side of the river. are anticipated. A stiff pile foundation Ordinarily the through-truss bridge demolition was designed to minimize the movement of method would require temporary piled support the pier and south abutment, and the bridge bents in the river. This would have been very superstructure was isolated from the movements difficult in the environmentally sensitive site and through the use of a guided sliding bearing at would have extended the project schedule and the tie girder/pier interface which allows the pier significantly increased costs. The solution was to and abutment to move towards the river up to modify and re-use the kingpost cable system and 400mm. The substructure piles were filled with “de-launch” the old bridge. reinforced concrete to minimize movements. This design approach eliminated a costly ground Geotechnical conditions were difficult and improvement program for the client. variable at the site. Liquefaction of the SOCIAL AND/OR ECONOMIC BENEFITS The completion of the new Vedder Bridge The launch of the new bridge and the de-launch brings safe and convenient access for tourists of the old bridge were both completed in one day and residents to the popular Cultus Lake and each. Chilliwack Lake, contributing to the development The bridge’s two arches are inclined slightly, in of the community. what is known as a “basket handle” arrangement, The design build project delivery method offered and are connected above the roadway with a unique opportunity for the project team to six horizontal pipe struts. Inclining the arches develop a cohesive and efficient bridge design performs the structural function of shortening the package for the client. EAC teamed with steel cross-members, which allow the use of lighter, fabricator Canron during the bid. The Contractor, more slender sections, while also providing a fabricator and designer closely collaborated captivating aesthetic. throughout the project from concept through to The bridge has already become favorite construction. This factor resulted in a number of destination for many local residents, cost saving decisions and unique constructability photographers; artists; hikers, joggers, cyclists concepts. and amateur fisherman. KCB’s engineering team A major achievement of the design build team on is proud to have participated in the rewarding this project was the increased safety and efficiency project that will benefit local residents, tourists gained through avoiding any work within the river. and British Columbians for decades to come. ENVIRONMENTAL BENEFITS The City of Chilliwack selected the arched then re-used to “de-launch” the old bridge option for the Vedder Bridge from two bridge for demolition. alternatives provided in the bids. Arch bridges By assembling and disassembling the are usually constructed in place and temporarily respective bridge structures on land, supported by “falsework”, until the arch at each the design-build team increased safety end is supported by permanent abutments, for the construction team and minimized or else floated into place on barges. Neither the environmental footprint of the project. method was practical on the Vedder River, an Completing work over land is safe, efficient and important salmon and steelhead river. In-river cost effective. works were undesirable due to fisheries windows schedule limitations and sensitive environment. Using precast deck panels as launching counterweight reduced the cost of hauling other KCB provided an innovative financial and types of counterweight to the site, thus reducing technical solution for designing and constructing the construction cost. In addition, the precast the bridge, minimal disruption to the deck panels also acted as formwork for the cast- surrounding community, environment and road/ in-place deck topping, avoiding construction of utility network. The kingpost system used the timber formwork over the water. These design precast panels, which would later be used to efficiencies further contributed to minimizing the form the bridge deck, as large counterweights. environmental footprint of the project. The continuous south side span tie girders also functioned as the “launching nose” extension required for launching. The same system was MEETING CLIENT’S NEEDS The existing Vedder River Bridge was deficient management services for the engineering in clearance above flood water, and had many during the bid, and subsequently for the deteriorating components. The intersection at detailed design. the north end did not have sufficient vehicle The winning design was an capacity during rush hours or peak weekend attractive tied arch bridge. The demand created by recreational traffic accessing new 80m long Vedder River Cultus Lake and Chilliwack Lake in the summer Bridge has two spans months. with a 60m steel tied The Project Owner, the City of Chilliwack (CoC), arch main span with decided on the design build project delivery hanger rods in a model for the bridge replacement. CoC had “ray” arrangement. strict budget limits, but desired a unique The longitudinal tie attractive bridge for the popular and highly girders for the arch visible location in the community. The project are comprised of also included an upgrade of the approaching steel rectangular “box” roads and a new roundabout intersection on sections which connect the north end to provide greater travel capacity the ends of the arches, and and improve safety. Demolition of the existing then continue through the 20m Vedder River Bridge was also included in the south side span as supporting project scope. girders. The continuous design avoids expansion joints and provides KCB was retained by Emil Anderson Construction simple and consistent fabrication method (EAC) to provide structural, hydrotechnical, and for the entire bridge. geotechnical engineering, along with design DISPLAY BOARD CLIENT CONTRACTOR ASSOCIATION OF CONSULTING ENGINEERING COMPANIES | CANADA ASSOCIATION DES FIRMES D’INGÉNIEURS-CONSEILS | CANADA VEDDER BRIDGE REPLACEMENT DESIGN BUILD PROJECT CHILLIWACK, BC lohn Crippen Berger Ltd. (KCB) teamed up with contractor Emil Anderson Construction Inc. (EAC) for the design and construction of an attractive arch bridge over the Vedder River in Chilliwack, BC. KCB led the
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