#LESNERBRIDGE update from Project Manager – “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.”

October 16th 2015 update:

To All the Travelers and Fans of the Lesner Bridge:

As we view summer in the rear view mirror and creep into cooler weather, Public Works offers you the latest chapter in our story of: The Lesner Bridge Replacement Project. Brought to you by bridge master and author Chris “Wojo” Wojtowicz, this latest update will inform and enlighten. It also has pictures!

Work at the bridge is moving along quite well, and crews continue to progress each day. Things are changing weekly, so if you haven’t had the opportunity to check out what is going on there, please do so. It really is quite impressive.

Feel free to let Chris or me know if you have any questions or need more information. If you haven’t had the opportunity to watch this construction sequence animation, please check it out.

As a reminder, we are regularly updating information on our WEB page at: http://www.vbgov.com/lesner-bridge. You can also follow us on Twitter at: @lesnerbridge.

If you know of someone who would like to be added to our update list, please have them get in touch with me at this e-mail address and I will be glad to add them. Please feel free to pass this along to others.

Thanks again for all of your interest and patience throughout this project. Enjoy the fall days and great weather – nor’easters and Joaquin aside – as we ease into cooler days and nights.

Take care, and stay safe.

Drew Lankford
Media and Communications
Department of Public Works
City of Virginia Beach

dlankfor@vbgov.com
(O) 757.385.8062
(C) 757.409.4353

*********************************************************************************

Friends:

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 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 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 from Abutment A (Westbound Bridge) Bridge Interior at Joints After Temporary Post Tensioning (Westbound Bridge)

Bridge Interior Looking at Pier 1 from Abutment A (Westbound Bridge) Bridge Interior at Joints After Temporary Post Tensioning (Westbound Bridge)

image003-6

Bridge Interior Looking at Pier 1 from Abutment A (Westbound Bridge) Bridge Interior at Joints After Temporary Post   Tensioning (Westbound Bridge)

Bridge Interior Looking at Pier 1 from Abutment A (Westbound Bridge) Bridge 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:

Ø Install and post-tension the permanent tendons through the bridge segments in span 1 of 10 of the westbound bridge

Ø Complete the last concrete placement in the footing of Pier #4

Ø Form and place the concrete in the footing for Pier #6

Ø Install the 8-inch and 16-inch water mains within Shore Drive

Ø Grade and pave the western approach to the bridge (in front of 3556 On The Bay Condominiums)

Ø Erect falsework at Pier 2 and prep for erection gantry support installation

That’s about it for now.

Drive safely!

– Chris

Christopher J. Wojtowicz, PE
Project Manager
City of Virginia Beach
Department of Public Works
Engineering Division
2405 Courthouse Drive
Virginia Beach, VA 23456-9031
Office: (757) 385-5785
Fax: (757) 385-5668
Email: cwojtowi@vbgov.com

Sorry! No screen shot of Construction Camera like we usually do. Site is down.

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