Lesner Bridge Replacement

Transcription

1 Lesner Bridge Replacement Rendering of the Completed Lesner Bridge Structure Construction Camera A Construction Camera has been installed to view images of the bridge construction. Images are updated on the hour. October 20, 2015 Update Assembly of span 1 (of 10) for the new westbound bridge is well underway! Since the last project update, the erection gantry has been load tested and certified for use in assembling the pre-cast concrete segments into the superstructure of the new bridge. All of the Span 1 segments have been placed into position and are currently being epoxied and temporarily post-tensioned in place in preparation for installing the ten permanent tendons that will hold the bridge span together when we move the gantry to span #2. This is a very important step in the bridge construction process since the temporary post-tensioning system holds the bridge geometry in place until the permanent tendons can be installed and stressed. Once these tendons are stressed to their specified force, the hanging bars holding the bridge segments in place can be released and the gantry moved forward to the next bridge span. Right now, the contractor is installing five 1-3/8 diameter steel bars inside each of the bridge segments; two in each wing of the segment and one along the bottom centerline of the segments. Epoxy is applied to the faces of the two segments that are about to be pulled together and then the four wing post tensioning bars are each pulled with a jacking force of 150,000 lbs. (150 kips) and the bottom centerline bar is pulled with a jacking force of 100 kips. This securely locks the two segments together creating a watertight seal and ensuring that the bridge geometry doesn t change prior to installing the

2 permanent tendons. After two segments are assembled, couplers are installed on the steel bars and the process repeated until all segments at connected from abutment to pier or from pier to pier. Bridge Segments Attached to Erection Gantry with Hanging Bars (Westbound Bridge) Epoxy Applied to Segment Faces Just Prior to Post-Tensioning (Westbound Bridge) Bridge Interior Looking at Pier 1 form Abutment A (Westbound Bridge)

3 Interior at Joints After Temporary Post-Tensioning (Westbound Bridge) All of the segments for Span 2 of the bridge have been delivered the project site and are being stored in the laydown yard behind the Lynnhaven Boat Ramps. Installation of these Span 2 segments will begin in November and continue into the first week of December. Ahead of the erection gantry work continues on the footings for the remaining bridge columns. The construction joint in the Pier 4 footing is being prepared for the final concrete placement, the seal slab and footing formwork for Pier 6 has been set and is being readied for the placement of reinforcing steel. Cofferdams at Piers 7 and 9 have been installed in preparation for installing the footing formwork. Construction of WB Bridge Abutment B was completed on Monday (10/12/15). AMI, Inc. in Portsmouth, continues to build the new bridge segments. A total of 74 of the 168 bridge segments have been cast. In addition to the bridge work, the contractor has begun utility work on the east side of the bridge near Bubba s and the Lesner Inn. A new 8-inch water line is being installed along Cape Henry Drive from the Maryland Pilots Association towards the former Starbucks location. This line will cross Shore Drive in front of Bubba s and tie into the new 16-inch water main being installed in the approach for the new westbound bridge. This utility work will require periodic daytime and nighttime lane closures on Shore Drive at the Vista Circle intersection. Over the next two weeks, the bridge contractor will: Install and post-tension the permanent tendons through the bridge segments in span 1 of 10 of the westbound bridge Complete the last concrete placement in the footing of Pier #4 Form and place the concrete in the footing for Pier #6 Install the 8-inch and 16-inch water mains within Shore Drive Grade and pave the western approach to the bridge (in front of 3556 On The Bay Condominiums) Erect falsework at Pier 2 and prep for erection gantry support installation That's about it for now. Please Drive Safely!

4 -Chris History: This project first appeared in the FY CIP and is included in the Governor s Transportation Plan. Lesner bridge was identified for replacement through the City s bridge condition inventory and the Shore Drive Transportation Study. In VDOT s final FY2014 six-year plan, the State shifted prior VDOT funding to out years, but requested the City maintain the prior schedule. The City Council approved substitution of contractual obligation debt on August 13, 2013 so the project could be bid for construction, with agreement that VDOT would provide $10,453,200 in FY , $13,000,000 in FY , and $14,220,117 in FY and the local debt would be decreased in those years accordingly. Bid were opened on December 21, 2013 and the construction contract executed with McLean Construction on April 28, The Notice to Proceed for construction was issued for June 2, Work Description: This project will replace the existing Lesner Bridge with a signature facility that is capable of handling six lanes of traffic in the future. The replacement bridge structure will be striped for two lanes of traffic and wide shoulders. The inside lane will be 12 feet wide and the inside shoulder will be 6 feet wide. The outside lane will be 14 feet wide and the outside shoulder will be 8 feet wide. Each bridge will also have a 10 foot wide multi-use path for use by pedestrians and recreational cyclists. The proposed bridge will be designed to provide minimum 45 feet vertical clearance above mean high water and 225 feet minimum horizontal clearance at center navigation channel span. This project also includes upgrades to the intersections of East Stratford Street and Vista Circle (the termini for the project), as well as aesthetic upgrades within the project limits. McLean Construction, Inc. began the project June 2, As a reminder, the sidewalk on westbound Shore Drive is closed to pedestrians and cyclists between Page Avenue and East Stratford Street. If pedestrians need to cross the bridge, they will need to cross the eastbound bridge where a temporary 4-foot wide pedestrian/cyclist access has been provided. PLEASE DRIVE SAFELY!

5 Pending Activities: The pre-casting of the concrete bridge segments began November 2014 and crews hope to place the first bridge segment into the new bridge in March Immediately after this is completed, the building of the segmented superstructure for the north span will begin. Construction of the westbound bridge lanes (north span) should be completed by November 2015, and construction of the eastbound bridge and lanes (south span) will begin in April 2016 and is scheduled for completion in May Demolition of the current bridges will take place beginning in November 2015 and continue into March Additional information is available on the Lesner Bridge Project Detail Sheet Select Lesner Bridge Replacement Project Archive to view past updates for this project. Contact Information Public Works Engineering Direct: (757)