A Bailey bridge is a type of portable, pre-fabricated, truss bridge. It was developed in 1940-1941 by the British for military use during World War II and saw extensive use by British, Canadian and US military engineering units. A Bailey bridge has the advantages of requiring no special tools or heavy equipment to assemble. The wood and steel bridge elements were small and light enough to be carried in trucks and lifted into place by hand, without requiring the use of a crane. The bridges were strong enough to carry tanks. Bailey bridges continue to be used extensively in civil engineering construction projects and to provide temporary crossings for foot and vehicle traffic.
Bailey bridge over the Meurthe River, France
|Descendant||Mabey Logistic Support Bridge, Medium Girder Bridge|
|Carries||Pedestrians, Road vehicles, Rail Vehicles|
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The success of the Bailey bridge was due to the simplicity of the fabrication and assembly of its modular components, combined with the ability to erect and deploy sections with a minimum of assistance from heavy equipment. Many previous designs for military bridges required cranes to lift the pre-assembled bridge and lower it into place. The Bailey parts were made of standard steel alloys, and were simple enough that parts made at a number of different factories could be completely interchangeable. Each individual part could be carried by a small number of men, enabling army engineers to move more easily and more quickly than before, in preparing the way for troops and matériel advancing behind them. Finally, the modular design allowed engineers to build each bridge to be as long and as strong as needed, doubling or tripling up on the supportive side panels, or on the roadbed sections.
The basic bridge consists of three main parts. The bridge's strength is provided by the panels on the sides. The panels are 10-foot-long (3.0 m), 5-foot-high (1.5 m), cross-braced rectangles that each weigh 570 pounds (260 kg), and can be lifted by six men. The panel was constructed of welded steel. The top and bottom chord of each panel had interlocking male and female lugs into which engineers could inset panel connecting pins.
The floor of the bridge consists of a number of 19-foot-wide (5.8 m) transoms that run across the bridge, with 10-foot-long (3.0 m) stringers running between them on the bottom, forming a square. Transoms rest on the lower chord of the panels, and clamps hold them together. Stringers are placed on top of the completed structural frame, and wood planking is placed on top of the stringers to provide a roadbed. Ribands bolt the planking to the stringers. Later in the war, the wooden planking was covered by steel plates, which were more resistant to the damage caused by tank tracks.
Each unit constructed in this fashion creates a single 10-foot-long (3.0 m) section of bridge, with a 12-foot-wide (3.7 m) roadbed. After one section is complete it is typically pushed forward over rollers on the bridgehead, and another section built behind it. The two are then connected together with pins pounded into holes in the corners of the panels.
For added strength several panels (and transoms) can be bolted on either side of the bridge, up to three. Another solution is to stack the panels vertically. With three panels across and two high, the Bailey Bridge can support tanks over a 200-foot span (61 m). Footways can be installed on the outside of the side-panels; the side-panels form an effective barrier between foot and vehicle traffic and allow pedestrians to safely use the bridge.
A useful feature of the Bailey bridge is its ability to be launched from one side of a gap. In this system the front-most portion of the bridge is angled up with wedges into a "launching nose" and most of the bridge is left without the roadbed and ribands. The bridge is placed on rollers and simply pushed across the gap, using manpower or a truck or tracked vehicle, at which point the roller is removed (with the help of jacks) and the ribands and roadbed installed, along with any additional panels and transoms that might be needed.
During World War II, Bailey bridge parts were made by companies with little experience of this kind of engineering. Although the parts were simple, they had to be precisely manufactured if they were fit each other correctly, so they were assembled into a test bridge at the factory to make sure of this. To do this efficiently, newly manufactured parts would be continuously added to the test bridge, while at the same time the far end of the test bridge was continuously dismantled and the parts dispatched to the end-users.
Donald Bailey was a civil servant in the British War Office who tinkered with model bridges as a hobby. He had proposed an early prototype for a Bailey bridge before World War II in 1936, but the idea was not acted upon. Bailey drew an original proposal for the bridge on the back of an envelope in 1940. On 14 February 1941, the Ministry of Supply requested that Bailey have a full-scale prototype completed by 1 May. Work on the bridge was completed with particular support from Ralph Freeman. The design was tested at the Experimental Bridging Establishment (EBE), in Christchurch, Hampshire, with several parts from Braithwaite & Co., beginning in December 1940 and ending in 1941. The first prototype was tested in 1941. For early tests, the bridge was laid across a field, about 2 feet (0.61 m) above the ground, and several Mark V tanks were filled with pig iron and stacked upon each other.
The prototype of this was used to span Mother Siller's Channel, which cuts through the nearby Stanpit Marshes, an area of marshland at the confluence of the River Avon and the River Stour. It remains there ( ) as a functioning bridge. Full production began in July 1941. Thousands of workers and over 650 firms, including Littlewoods, were engaged in making the bridge, with production eventually rising to 25,000 bridge panels a month. The first Bailey bridges were in military service by December 1941, Bridges in the other formats were built, temporarily, to cross the Avon and Stour in the meadows nearby. After successful development and testing, the bridge was taken into service by the Corps of Royal Engineers and first used in North Africa in 1942.
The original design violated a patent on the Callender-Hamilton bridge. The designer of that bridge, A. M. Hamilton, successfully applied to the Royal Commission on Awards to Inventors. The Bailey Bridge was more easily constructed, but less portable than the Hamilton bridge. Hamilton was awarded £4,000 in 1936 by the War Office for the use of his early bridges and the Royal Commission on Awards to Inventors awarded him £10,000 in 1954 for the use, mainly in Asia, of his later bridges. Lieutenant General Sir Giffard Le Quesne Martel was awarded £500 for infringement on the design of his box girder bridge, the Martel bridge. Bailey was later knighted for his invention, and awarded £12,000.
Use in the Second World WarEdit
The first operational Bailey bridge during the Second World War was built by 237 Field Company R.E. over Medjerda River near Medjez el Bab in Tunisia on the night of 26 November 1942. The first of a Bailey bridge built under fire was at Leonforte by members of the 3rd Field Company, Royal Canadian Engineers.[unreliable source?] The Americans soon adopted the Bailey bridge technique, calling it the Portable Panel Bridge. In early 1942, the United States Army Corps of Engineers initially awarded contracts to the Detroit Steel Products Company, the American Elevator Company and the Commercial Shearing and Stamping Company, and later several others.
The Bailey provided a solution to the problem of German and Italian armies destroying bridges as they retreated. By the end of the war, the US Fifth Army and British 8th Army had built over 3,000 Bailey bridges in Sicily and Italy alone, totaling over 55 miles (89 km) of bridge, at an average length of 100 feet (30 m). One Bailey, built to replace the Sangro River bridge in Italy, spanned 1,126 feet (343 m). Another on the Chindwin River in Burma, spanned 1,154 feet (352 m). Such long bridges required support from either piers or pontoons.
A number of bridges were available by 1944 for D-Day, when production was accelerated. The US also licensed the design and started rapid construction for their own use. A Bailey Bridge constructed over the River Rhine at Rees, Germany, in 1945 by the Royal Canadian Engineers was named "Blackfriars Bridge", and, at 558 m (1814 ft) including the ramps at each end, was then the longest Bailey bridge ever constructed. In all, over 600 firms were involved in the making of over 200 miles of bridges composing of 500,000 tons, or 700,000 panels of bridging during the war. At least 2,500 Bailey bridges were built in Italy, and another 2,000 elsewhere.
Bailey Bridging made an immense contribution towards ending World War II. As far as my own operations were concerned, with the eighth Army in Italy and with the 21 Army Group in North West Europe, I could never have maintained the speed and tempo of forward movement without large supplies of Bailey Bridging.
The Skylark launch tower at Woomera was built up of Bailey bridge components. In the years immediately following World War II, the Ontario Hydro-Electric Power Commission purchased huge amounts of war-surplus Bailey bridging from the Canadian War Assets Corporation. The commission used bridging in an office building. Over 200,000 tons of bridging were used in a hydroelectric project. The Ontario government was, several years after World War II, the largest holder of Bailey Bridging components. After Hurricane Hazel in 1954, some of the bridging was used to construct replacement bridges in the Toronto area. The Old Finch Avenue Bailey Bridge, built by the 2nd Field Engineer Regiment, is the last still in use.
The longest Bailey bridge was put into service in October 1975. This 788-metre (2,585 ft), two-lane bridge crossed the Derwent River at Hobart, Australia. The Bailey bridge was in use until the reconstruction of the Tasman Bridge was completed on 8 October 1977. Bailey bridges are in regular use throughout the world, particularly as a means of bridging in remote regions. In 2018, the Indian Army erected three new footbridges at Elphinstone Road, a commuter railway station in Mumbai, and at Currey Road and Ambivli. These were erected quickly, in response to a stampede some months earlier, where 23 people died. The United States Army Corps of Engineers uses Bailey Bridges in construction projects. Two temporary bailey bridges are being used on the northern span of the Dufferin Street bridges in Toronto since 2014.
A Sherman tank and a Jeep ferried across the river Garigliano, central Italy, using a raft constructed from pontoons and a section of Bailey bridge (January 1944)
Bailey bridge over the Wadi el Kuf, Libya, with bridge sections used to construct the supports (2007)
Bailey bridge at Whitefish Falls, Ontario, Canada (2006)
Combat engineers inspect a bridge on Route Arnhem in Iraq (2009)
Bailey bridge over the Coppename River at Bitagron, Suriname (1976)
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He sketched the original design for the Bailey Bridge on the back of an envelope as he was being driven to a meeting of Royal Engineers to debate the failure of existing portable bridges
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