Monday, April 24, 2017

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

(Bridge Hunter, Satellite, 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






Aban/NS/Southern over Kentucky River west of Versailles, KY

(Bridge HunterHistoric Bridges, Satellite)

"Built 1889 [by Louisville Southern Railway], closed to traffic in November 1985." [BridgeHunter]

Tony Hall posted four pictures with the comment: "Youngs's high bridge near Versailles Kentucky."

1

3

4
Tony Hall   Bluegrass Scenic Railroad ends at the bridge. A company out of Louisville bought it and does bungee jumping from it.

I wonder what they charge to skip the jumping and just walk across the bridge. Whoops, they don't even sell tickets; they run it as a private club. [Kentucky]

Street View from US-62
Studying a Norfolk Southern Map, RJCC (R. J. Corman/Central Kentucky Lines) connects Versailles to NS at Lexington, KY. (The map is 75 million bytes, and it will test the performance of your .pdf reader and computer.)




US-50+I-255 Bridges over Mississippi River near St. Louis, IL

(1944 Bridge Hunter1984+1990 Bridge Hunter, John A. Weeks III, 3D Satellite)

The official name is Jefferson Barracks Bridge. The original truss bridge "was completed in 1944 as a war-time measure to allow the Illinois side better access to the western part of the St. Louis area." [Bridge Hunter comment]

This allowed easier access to the Jefferson Barracks. A 1702 acre parcel of land was established in 1826 as the first permanent military base west of the Mississippi River to protect pioneers of the Louisiana Purchase from the threats of Indians. It was the major training base for the Army Of The West from 1826 through the Civil War. A national cemetery was also created. On June 30, 1946, the army base was decommissioned.Today it is used by the National Guard and Army Reserve,  an expansion of the national cemetery, evidently a VA hospital, and a park and museum. [History, cem, John A. Weeks III]

William A. Shaffer posted
Jefferson Barracks Bridge - St. Louis, MO (5.11.13)
(Photo by William A. Shaffer)
May 1995 flood, Public Domain from Flickr
A new bridge was built next to the old one and then the old one was replaced by a second bridge.

Jefferson Barracks Bridge
AB, search for "jefferson barracks"
JEFFERSON BARRACKS BRIDGE
Completion Date: 9/30/1983
This was a superstructure fabrication and erection contract for a 4,000' Mississippi River crossing, including a 910' box chord tied arch main span and steel plate girder approaches. This tied arch is one of the largest of its type in the USA.
The old bridge was a toll bridge until the bonds were retired in 1959.

1945 photo from Department of Transportation Collection at the Mo State Archives

Sunday, April 23, 2017

Detroit Avenue over Cuyahoga River in Cleaveland, OH

(Bridge Hunter, Satellite, 3D Satellite)

By LeeG7144 (Own work) [CC BY-SA 3.0], via Wikimedia Commons
The 6 streetcar tracks on the lower deck were abandoned in 1955.

OBLIQUE VIEW - Detroit Superior High Level Bridge, Cleveland, Cuyahoga County, OH
Library of Congress: HAER OHIO,18-CLEV,22--28 (CT)


Eric Mortensen posted
The Buffalo heading up river on the Cuyahoga this afternoon.

Saturday, April 22, 2017

Making Big Propellers

John Abbott posted
Chuck Larkin They're cast bronze, then machined to size. There are some videos of the steps required to make them..
Michael Murray I ran large 5 Axis to machine a prop. at RRNM it was the most boring job I ever had...we could get one blade at a time under the machine bridge....I ran the CVN Carrier prop.
Chance O'Neil You should see submarine props. Way bigger and way less fun to work on. Cool to look at.
Steve Walker Went to Groton, Conn. to meet a mate. Had security clearance, but NO photos of sub props.
[I saw a Science Channel program on make the big subs. They showed an animation with the prop turning. I noticed it had many thin bladse and an exaggerated curve so that it can turn slow and avoid cavitation.]

David O'Neill One of the screws for the Queen Mary is on display in front of a museum in L.A.. according to the sign they were originally balanced to such a high degree they could be rotated with 2 fingers!
[That also speaks well of the construction of the bearing.]
Chuck Larkin commented on the above posting
Chance O'Neil Now imagine some 5"diameter threaded holes in the top of that propeller hub that are about 5and a half inches deep. The problem is that they should have had about 6" deep threads. Now picture a tap in that hole with a 100:1 torque multiplier on it with a cheater pipe long enough to reach a few feet past the edge of the blades. Now picture me and the other poor guy holding that pipe and pushing it around and around all night to tap the threads to the bottom of the hole. Ya. Propeller work is not glamorous.
In the new modern propellers that are milled, or even ground, you can still see each pass of the tool. I guess the key is that they machine along the flow of water across the blade.



I recognize Wartsila as the company that makes the worlds largest diesel engines for big ships.


Whoops, this thumbnail invalidates my conclusion that the machine ripples are OK because they are with the flow of water rather than across it.

6-Mast Sailing Bulk Carrier and B&O Coaling Doc

Steam Engines, Tractors, Trains, & More shared George Lane's post. The post had three pictures and the comment:
Here are some interesting pictures of the Curtis Bay Coal Terminal in Baltimore MD operated by the Baltimore and Ohio Railroad. The pier was erected in 1900.

1

2

3
Satellite
The wood dock is long gone, but it appears that this dock is one B&O asset that CSX has not torn up. They maintain a stockpile of coal. (A birds-eye view shows that the southern part is sometimes also full.)

They are actively loading a vessel. Is this a boat or a see-going barge? By the later, I mean will a towboat connect to the stern to push it? It doesn't look big enough to be a boat.

Satellite

BNSF/CB&Q Bridge over Illinois River at Beardstown, IL

(Bridge Hunter, John A. Weeks IIISatellite, Google Photo)

Street View


Fred Monger posted a photo of a couple of BNSF pumpkins on the lift span. His comment was:
June 30, 2015 Illinois river at Beardstown 29.5.
Is "29.5" the river level? It does look rather high in the photo. But he didn't include any piers so it is hard to judge the river level. Looking at some Bridge Hunter photos, it appears the river is normally pretty close to the bottom of this bridge. John Weeks indicates the clearance is 20 feet.

The design of the lift towers look rather new. Neither Bridge Hunter nor John indicate when this bridge was built. Fortunately a comment in Bridge Hunter puts it at 1972. The comment also indicates that the previous swing bridge forced the tows to be broken up to pass just a few barges at a time through the narrow channel. The lift span is 300' wide.

That is a long ways for me for a field trip, but I noticed the road bridge is still a truss bridge.