Royal Albert Bridge
Royal Albert Bridge | |
---|---|
Coordinates | 50°24′27″N 4°12′12″W / 50.4076°N 4.2034°W |
Carries | Railway |
Crosses | River Tamar |
Locale | Between Plymouth and Saltash, United Kingdom |
Maintained by | Network Rail |
Characteristics | |
Design | Lenticular truss |
Material | Iron |
Total length | 2,187.5 feet (666.8 m) |
Width | 16.83 feet (5.13 m) (inside piers) |
Height | 172 feet (52.4 m) |
Longest span | 2 of 455 feet (138.7 m) |
No. of spans | 19 |
Piers in water | 3 |
Clearance below | 100 feet (30 m) |
History | |
Designer | I K Brunel |
Construction start | May 1854 |
Construction end | April 1859 |
Opened | 2 May 1859 |
Statistics | |
Listed Building – Grade I | |
Official name | Royal Albert Bridge and seventeen approach spans |
Designated | 17 January 1952 |
Reference no. | 1159292 |
Location | |
The Royal Albert Bridge is a
The Royal Albert Bridge was designed by
Cornwall Railway
Two rival schemes for a railway to
Design
The structure was the third in a series of three large
The river is about 1,100 feet (340 m) wide at Saltash. Brunel's first thoughts had been to cross this on a
Brunel now abandoned plans for a double track timber structure and instead proposed a
The two spans are lenticular trusses with the top chord of each truss comprising a heavy tubular arch in compression, which tend to expand in length under load, while the bottom chord comprises a pair of chains, which tend to contract in length under load. By design, these two effects cancel so that there is no net change in length under load. This in turn enables each of the trusses to be supported with no horizontal thrust exerted on the piers, which is crucial in view of the curved track on either side. Between these two chords are supporting cross-bracing members and suspension standards which hang beneath the bottom chord to carry the railway deck which is a continuous plate beam. There are also 17 shorter and more conventional plate-girder approach spans on the shore. On the Cornish side there are ten which measure (from Saltash station towards the river): 67.5 feet (20.6 m), 69.5 feet (21.2 m), 69.5 feet (21.2 m), 69.5 feet (21.2 m), 69.5 feet (21.2 m), 69.5 feet (21.2 m), 72.5 feet (22.1 m), 78.0 feet (23.8 m), 83.5 feet (25.5 m), 93.0 feet (28.3 m), and seven on the Devon side of (from the river towards St Budeaux): 93.0 feet (28.3 m), 83.5 feet (25.5 m), 78.0 feet (23.8 m), 72.5 feet (22.1 m), 69.5 feet (21.2 m), 69.5 feet (21.2 m), 69.5 feet (21.2 m). This gives a total length for the nineteen spans of 2,187.5 feet (666.8 m).[4]
History
1848-1859: Construction
The first work was to properly survey the river bed. On 26 April 1848 a 6-foot (1.8 m) iron cylinder 85 feet (25.9 m) tall was launched into the Tamar. From the bottom of this the bed of the river could be examined to identify its nature and the location of solid foundations. The Cornwall Railway at this time was finding it difficult to raise funds and so most operations were suspended that summer, but a small fund was allowed for Brunel to continue the survey. The cylinder was positioned at 35 different places and a total of 175 borings made.[4]
In 1853 the tenders for the bridge were considered by the Cornwall Railway Board, and it was decided to let the work to Charles John Mare, a shipbuilder from Blackwall who had built the ironwork for the Britannia Bridge. The fee he sought for building the Saltash Bridge was £162,000, but on 21 September 1855 while constructing the first of the two trusses he filed for bankruptcy. Brunel proposed that the company should complete this first truss itself by its own direct labour, to which the company agreed. A contract for the remainder of the building was awarded to Messrs Hudson and Male.[4]
Mare's first task had been to establish an erecting yard on the Devon shore with a jetty and workshops. He then proceeded to construct a 37-foot (11.3 m) iron cylinder 90 feet (27.4 m) tall which was to form the work base for the construction of the central pier. This was launched in May 1854 and moored in the centre of the river between four pontoons. The bottom had been shaped to follow the rock surveyed in 1848. Once it was settled on the river bed the water was pumped out, the mud within it excavated, and a solid masonry pier built up clear of the water. This was completed in November 1856.[4]
The landward piers on the Cornish side of the river were completed in 1854 and the girders for these spans were hoisted up to their correct positions. Next to be built was the main truss for the Cornwall side of the river. The lower ties of the trusses formed of chains made from 20 feet (6.1 m) links. Many were obtained from the suspended works for Brunel's Clifton Suspension Bridge and others rolled new for Saltash. The Cornwall span was floated into position on 1 September 1857 and jacked up to full height in 3-foot (0.9 m) stages as the piers were built up beneath it, the central pier using cast iron octagonal columns; the landward one using ordinary masonry.[4]
With the yard now cleared of the first truss, work could start on the main Devon span. This was similarly floated into position on 10 July 1858 and then raised in a similar manner. It was in its final position by 28 December 1858. After this had been removed, part of the yard had to be cleared to allow the construction of the final landward pier and then the Devon approach spans could be raised up to their final position. The work was sufficiently advanced that directors were able to make an inspection by train on 11 April 1859.[4]
The Cornwall span had been tested before it was launched. The two ends were supported on substantial timber piers and the remaining scaffolding removed. Static loads of 1.25 and 2.25 long tons per foot (4.2 and 7.5 t/m) were placed on the deck, the deflections measured and any permanent change measured once the load was removed. Now that it was completed, the bridge had its statutory inspection and tests by Colonel Yolland on behalf of the Board of Trade on 20 April 1859. He ran a heavy train over the bridge and measured deflections in the main trusses of 1.14 inches (29 mm) in the Devon truss, and 1.20 inches (30 mm) in the Cornwall one. Overall he described it as 'highly satisfactory'.[4]
1859: Opening day
1859-present
After Brunel's premature death on 15 September 1859 the directors of the Cornwall Railway Company decided to make the bridge a memorial to him by adding the words I.K. BRUNEL, ENGINEER, 1859 in large metal letters on either end of the bridge. In 1921, new access platforms were added that obscured the lettering but in 2006 Network Rail relocated the platforms, allowing the name to be clearly seen again.[10] The walkways had previously been temporarily removed in 1959 and the bridge floodlit during its centenary year.[4]
Over the weekend of 21–22 May 1892 the track gauge on the bridge was converted from 7 ft 1⁄4 in (2,140 mm) to 4 ft 8+1⁄2 in (1,435 mm) during the final conversion of the whole Great Western Railway.[7]
401 new cross-girders were fitted in 1905 to allow heavier locomotives to pass over. In 1908 the two spans nearest Saltash station were replaced with wider ones to accommodate a new track layout. The remaining approach spans were replaced on both sides of the river during 1928 and 1929. During the 1930s new cross-bracing and diagonal sway-bracing were added between the vertical standards to further strengthen the bridge and keep the suspension chains hanging in the correct shape.[4]
The bridge was
Additional links between the suspensions chains and the decking were added in 1969 to further strengthen the bridge.[7] In 2011 Network Rail began a three-year £10 million refurbishment involving replacing 50,000 bolts and installation of 100 tonnes of new steelwork. The bridge has also been stripped back to the bare metal and repainted in the Goose Grey colour originally applied in 1952.[13]
Cultural impact
The construction of such a large and distinctive bridge soon caught the attention of the general public. The launching of the Cornish span in 1857 attracted a crowd of around 20,000,[9] with similar numbers said to have witnessed the launch of the Devonport span and the opening day.[4] During its construction it was photographed many times and after its opening it was the subject for many paintings, including those by Devonport-born artist Alfred Wallis.[14] It has also been the subject of many photographs and postcards.[15]
It was already a feature in guidebooks in the year of its opening: "It is a labour of Hercules, but Mr Brunel has accomplished the feat," proclaimed one, and went on to report in detail the design and construction of the bridge that "for novelty and ingenuity of construction stands unrivalled in the world".[16] More than 100 years later it continues to appear in many travel guides and features.[17] John Betjeman summed up its impact on the traveller:
The general grey slate and back gardens of Plymouth, as seen from the Great Western made the surprise of Saltash Bridge all the more exciting. Up and down stream, grey battleships were moored in the Tamar and its reaches. Hundreds of feet below, the pathetic steam ferry to Saltash from the Devon bank tried to compete with Brunel's mighty bridge.[18]
The bridge has become a symbol of the transition from Devon to Cornwall. In the Great Western Railway's The Cornish Riviera travel guide,
The bridge is the backdrop of ITV1's
Special events
Special occasions have been marked over the years by special events:
- 1859 – The bridge was opened by Prince Albert two days before the railway was opened to the public. He arrived by special train from Windsor, was shown around the bridge and the works yard, and then left aboard the Royal Yacht.[4]
- 1959 – Floodlights lit up the bridge during 1959 in celebration of its centenary.[4]
- 2006 – The 200th anniversary of Isambard Kingdom Brunel's birth was celebrated by Network Rail permanently removing the access ways that covered his name above the portals.[10]
- 2009 – During the bank holiday weekend of 2–4 May there were many special events to commemorate the 150th anniversary of the opening of the bridge including a guided walk across the bridge and a re-enactment of the opening day.[20]
References
- ISBN 978-3-8480-0516-1.
- ISBN 0-905466-48-9.
- ^ Norrie, Charles Matthew (1956). Bridging the Years – a short history of British Civil Engineering. Edward Arnold (Publishers) Ltd.
- ^ ISBN 0-906294-39-8.
- ^ a b MacDermot, E T (1931). History of the Great Western Railway, volume II 1863–1921. London: Great Western Railway.
- ^ UK Retail Price Index inflation figures are based on data from Clark, Gregory (2017). "The Annual RPI and Average Earnings for Britain, 1209 to Present (New Series)". MeasuringWorth. Retrieved 11 June 2022.
- ^ ISBN 0-906025-49-4.
- ^ "Illustrated Railway Supplement". West Briton & Cornwall Advertiser. No. 2547. 1859.
- ^ ISBN 1-870754-11-5.
- ^ a b "Brunel's Royal Albert Bridge unveiled in all its splendour". Network Rail. Archived from the original on 3 March 2014. Retrieved 24 March 2010.
- ^ Historic England. "ROYAL ALBERT BRIDGE AND 17 APPROACH SPANS (1159292)". National Heritage List for England. Retrieved 5 April 2016.
- ^ Historic England. "ROYAL ALBERT BRIDGE (THAT PART IN PLYMOUTH CIVIL PARISH) (1386355)". National Heritage List for England. Retrieved 5 April 2016.
- ^ "Royal Albert Bridge Restoration Begins". The Railway Magazine. 8 June 2011. Archived from the original on 22 February 2014.
- ^ Blair, Andy. "Alfred Wallis: Artist & Mariner". Retrieved 15 July 2009.
- ^ "Photos of Saltash". Francis Frith. Frith Content Inc. Retrieved 21 August 2009.
- ISBN 0-7153-5293-8.
- ^ Hesp, Martin (7 July 2008). "My magnificent rail journey". Western Morning News. Western Morning News. Archived from the original on 25 November 2010. Retrieved 14 July 2008.
- ISBN 0-7230-0018-2.
- Mais, SPB (1934). The Cornish Riviera (3rd ed.). London: Great Western Railway.
- ^ "Events list". Royal Albert Bridge official website. Archived from the original on 4 May 2009. Retrieved 8 April 2009.
Further reading
- Mosley, Brian (October 2003). "Royal Albert Bridge". Encyclopaedia of Plymouth History. Plymouth Data. Archived from the original on 18 July 2011. Retrieved 13 February 2015.
- Bowden, Tom (June 1983). "Brunel's Masterpiece". OCLC 49957965.
- Hunt, John (25 March – 7 April 1998). "Refurbishing Cornwall's gateway". OCLC 49953699.
External links
- The Royal Albert Bridge official website with Live Webcam
- A modeller's research into the bridge
- Royal Albert Bridge at Structurae
- The Brunel Museum, Rotherhithe, London
- Photographs of the 150th anniversary events including the bridge walk and re-enactment of the opening
- Brunel portal
- An investigation of the first decorative scheme