Monday, April 24, 2017

US-1 Bypass+B&M over Piscataqua River between NH and ME

Satellite
(Bridge Hunter, Aug 2013 Photo, Webcams (if you click a view, then you can play back a time-lapse video of the view))

The official name is the Sarah Mildred Long Bridge. The original bridge was built in 1940 between Portsmouth, New Hampshire, and Kittery, Maine. It was built as part of a bypass to relieve the traffic on US-1 and the 1923 Memorial Bridge. The bridge also supported a Boston & Maine branch to South Berwick, ME. The Guilford Rail System/Pan Am/B&M branch has been cut back and now supports only the Portsmouth Naval Shipyard (95 photos). It also carried the traffic of I-95 across the river between 1960 and 1972 when the Piscataqua River Bridge and turnpike extensions were finally opened to carry road traffic high above the river with three lanes in each direction. The I-95 bridge is the steel arch bridge you see in the background of the following street view.

A replacement bridge was scheduled to be opened in Sept. 2017, but the old bridge was scheduled to be closed in Nov. 1, 2016. The old bridge must have been in really bad shape to plan forcing road traffic to use the interstate after the last the last train crossed it on Dec. 9, 2015. It was "carrying two loaded spent nuclear fuel flasks from Kittery Ship Yard en route to Idaho." [Bridge Hunter] But the lift span broke in August, 2016. Rather than spend the estimated $1 million to repair it, they just closed it a couple of months earlier than originally planed. Design of the new bridge started in 2013 and construction started in January, 2015. [MDOT]

[Wikipedia]

Street View of the building of the piers for the replacement bridge.
In addition to a lift span, the old bridge had a retractable steel girder span for the railroad deck that could let recreational boats pass without stopping road traffic. Because the railroad is used once in a blue moon to transport nuclear material to the ship yard, the retractable span that we see on the left side of the street photo below is normally open. That girder span was designed to raise up and then roll back into the truss. I included the "bridgeRare" label because of this span.

Street View of the retractable girder span as well as the lift span.
Now we turn our attention to the replacement bridge. The new bridge appears to use box girder concrete sections. Note the railroad deck has more piers than the road deck needs. But the extra piers are simple column piers.
MDOT
An artists' view from I-95.
MDOT
The second bullet point below explains why the lift span does not have two decks. The lift span is effectively designed for "street running" and is shared between the two decks. It is, of course, normally at the road deck level.

Key Bridge Attributes
  • New bridge alignment improves marine navigation by straightening the navigational channel, allowing larger ships to access the port and shipyard.
  • With a larger 56’ vertical clearance in its “resting” position, there will be 68% fewer bridge openings.  In the normal operating, “resting” position, the bridge’s lift span is at its middle level, allowing motor vehicles to cross the river. The new bridge’s movable “hybrid” span lifts up to allow passage of tall vessels and lowers to railroad track level for trains to cross.
  • 200’ tall precast concrete towers will support the 300’ long streamlined structural steel box girder lift span.
  • New bridge layout uses eleven (11) fewer piers than the existing bridge, also improving the gateway span leading into downtown Portsmouth by eliminating an existing median pier. 
[MDOT]

The use of one lift span that can carry both road and rail traffic and that can be positioned at three levels --- open, road traffic, and railroad traffic --- also justifies the "bridgeRare" label.

This is the Facebook posting that provided the name so that I could learn about this bridge.

Jim Browne posted
Dinner with a view. [In the case of Jim, the view is the many cranes.]
Justin Classen Sarah Mildred Long bridge I worked there for a year and a half.
Below zooms into the towers and the part of the railroad deck that is not completely obscured by crane barges. I'm sure the lift span is being built offsite and will be floated into place when the towers are ready for it. It looks like the towers are done except for the mechanical enclosure and equipment at the top. It appears from the concept art that the counterweights will be hidden in the towers.
At Facebook resolution

Update:
Ben Stalvey shared Sarah Mildred Long Bridge Replacement Project's photo.
MLC 300 making it look so easy
[The sheaves are 20-feet in diameter.]

Curt Seeliger posted two photos with the comment: "Soon to be un-abandoned, the rail link to The Portsmouth Naval Shipyard in Kittery, Maine as a New Route 1 Bridge to Portsmouth, New Hampshire is opening soon"

1
Railroad tracks soon to be installed on the Bridge's lower level. Kittery, Maine.

2
Soon to be connected rail link to the Portsmouth Naval Shipyard.
Sarah Mildred Long Bridge Replacement Project posted three photos with the comment: "Some aerial photos of the bridge from Saturday, courtesy of The US Coast Guard."
1
Ben Stalvey MLC 300 with vpc on barge. To the right 4100 tower and another 4100 with jib

2

3
Sarah Mildred Long Bridge Replacement Project No asphalt on the lifts span. It will have a concrete wearing surface
The source of the above link was a share by Ben Stalvey.

Rick Webber commented on Ben's share
the machine that drilled the caissons. good oke" 4100w

Rick Webber commented on Ben's share

Nicholas Green II commented on Ben's share
I drilled with it at Sarah Long for Case Foundation. We’re using the same Cianbro 4100s2 and barge with a different attachment at the Portsmouth Naval Yard. Old school still has its place...

Nicholas Green II commented on Ben's share

Ruben Schofield commented on Ben's share

Ruben Schofield commented on Ben's share
 Floating in the center spanBen StalveyGroup Admin MLC 300 VPC max. Cianbro newest crane.
Ruben Schofield Yes this is. And a 4100 ring in the back ground.Ben StalveyGroup Admin Very nice crane surprised the Manitowoc 16000 wasn't on site too.Ruben Schofield 16000 was on a wind job at the beginning of this job. Now it is on a small power plant job.
Sarah Mildred Long Bridge Replacement Project posted
Today [2017 Oct 26] we are conducting test lifts of the Lift Span. The channel is still scheduled to be open to marine traffic tomorrow morning at 6am
Ben Stalvey shared
Cianbro Manitowoc MLC 300
Sarah Mildred Long Bridge Replacement Project posting
Cianbro is loading the sheave walls for the Portsmouth Towers onto one of their barges. These sheave walls make up the precipice of the towers, and are what the sheaves (shown in the bottom of this picture on their sides) will sit on
Ruben Schofield posted
Ben StalveyGroup Admin Cianbro MLC 300
Ron Nadeau posted two photos.


1
Joe Hyde SML Bridge !!Ron Nadeau I am amazed that the hoist and boom are all attached to the booms.  I guess I've been on friction cranes too long..

2
Dave Mergard I don't think that stand on the end of the VPC max is going to help.
John Pearson posted
Louis DeFazio Mlc300vpcIII


Some shots of the last train over the old bridge. Carrying a couple of spent-nuclear-fuel cars away from the Naval Shipyard.


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