Northam Bridge: Difference between revisions
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The new route between Portsmouth and Southampton would be four miles (6 km) shorter than travelling via Mansbridge, and as a result the proposal to improve transport between the two important port cities was keenly supported by the [[Admiralty]], especially since this was the time of the [[Napoleonic Wars]].<ref name='bend' /> Consequently when the Northam Bridge Company sought an [[Act of Parliament]] to build a bridge, the Act was passed quickly.<ref name='bend' /> |
The new route between Portsmouth and Southampton would be four miles (6 km) shorter than travelling via Mansbridge, and as a result the proposal to improve transport between the two important port cities was keenly supported by the [[Admiralty]], especially since this was the time of the [[Napoleonic Wars]].<ref name='bend' /> Consequently when the Northam Bridge Company sought an [[Act of Parliament]] to build a bridge, the Act was passed quickly.<ref name='bend' /> |
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The new roads and bridges were built in 1799, and were originally operated as [[toll road]]s. The first Northam Bridge was of wooden construction.<ref name='bend' /> The wooden bridge was replaced in 1889 by an iron bridge |
The new roads and bridges were built in 1799, and were originally operated as [[toll road]]s. The first Northam Bridge was of wooden construction.<ref name='bend' /> The wooden bridge was replaced in 1889 by an iron bridge<ref name="pc"> |
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{{cite web |
{{cite web |
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}}</ref> at a cost of £9,000.<ref name=adams /> |
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}}</ref> |
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The bridge remained a [[toll bridge]] until 1929<ref name="pc" /> when the ownership was transferred from the [[private sector]] to the Southampton Corporation. |
The bridge remained a [[toll bridge]] until 1929<ref name="pc" /> when the ownership was transferred from the [[private sector]] to the Southampton Corporation. |
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==Construction and dimensions== |
==Construction and dimensions== |
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The parapets of the first (wooden) bridge were {{convert|24|ft|m}} apart, as were those of its wrought-iron successor.<ref name=adams>{{cite journal|last=Adams|first=H.C.|coauthors=C W PIKE; D H LEE; F I CHILDS; G O KEE; A GOLDSTEIN; J R LOWE; A D HOLLAND; WOOLDRIDGE; J CUEREL; HAUCH|title=NEW NORTHAM BRIDGE, SOUTHAMPTON.|journal=Institution of Civil Engineers Proceedings|date=01 May 1955|volume=4|issue=3|pages=290 –298|doi=10.1680/iicep.1955.11382|url=http://www.icevirtuallibrary.com/docserver/fulltext/iicep.1955.11382.pdf?expires=1336999923&id=id&accname=guest&checksum=AEED157796EB8D4927162E6984E6E0C3|accessdate=14 May 2012}}</ref> |
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The third bridge utilised the latest technology available at the time but the style of the bridge was of the pre-[[World War II|war]] era.<ref name="sutherland">{{cite book|last=Sutherland|first=R. J. M.|coauthors=Dawn Humm, Mike Chrimes|title=Historic Concrete|publisher=Thomas Telford|date=2001|isbn=0-7277-2875-X|url=http://books.google.co.uk/books?id=GTjW1lZeYwgC&pg=PA261&lpg=PA261&dq=Northam+Bridge&source=web&ots=r1IXpwIKAF&sig=f3w4BzOl6YtGkQXY5n2GGK5NSXE&hl=en&sa=X&oi=book_result&resnum=9&ct=result}}</ref> The main deck structure has [[Transversality|transverse]] [[Diaphragm (structural system)|diaphragm]]s and narrowly spaced beams, which were pre-cast on site using deflected cables.<ref name="sutherland" /> Pre-cast, pre-stressed slabs, known as ''junction slabs'' or ''continuity slabs'', were placed between the tops of the beams by transverse stressing over a length where the flanges of the tees were removed.<ref name="sutherland" /> These, together with [[in situ]] diaphragms between the ends of the beams, allowed the deck structure to be made continuous for live and superimposed loads.<ref name="sutherland" /> After the junction slabs were in place, the main beams were post-tensioned through the diaphragms.<ref name="sutherland" /> |
The third bridge utilised the latest technology available at the time but the style of the bridge was of the pre-[[World War II|war]] era.<ref name="sutherland">{{cite book|last=Sutherland|first=R. J. M.|coauthors=Dawn Humm, Mike Chrimes|title=Historic Concrete|publisher=Thomas Telford|date=2001|isbn=0-7277-2875-X|url=http://books.google.co.uk/books?id=GTjW1lZeYwgC&pg=PA261&lpg=PA261&dq=Northam+Bridge&source=web&ots=r1IXpwIKAF&sig=f3w4BzOl6YtGkQXY5n2GGK5NSXE&hl=en&sa=X&oi=book_result&resnum=9&ct=result}}</ref> The main deck structure has [[Transversality|transverse]] [[Diaphragm (structural system)|diaphragm]]s and narrowly spaced beams, which were pre-cast on site using deflected cables.<ref name="sutherland" /> Pre-cast, pre-stressed slabs, known as ''junction slabs'' or ''continuity slabs'', were placed between the tops of the beams by transverse stressing over a length where the flanges of the tees were removed.<ref name="sutherland" /> These, together with [[in situ]] diaphragms between the ends of the beams, allowed the deck structure to be made continuous for live and superimposed loads.<ref name="sutherland" /> After the junction slabs were in place, the main beams were post-tensioned through the diaphragms.<ref name="sutherland" /> |
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The consulting engineers responsible for the new bridge were [[James Meadows Rendel (engineer)#London_practice|Rendel Palmer & Tritton]], the same firm used for [[Waterloo Bridge]] in [[London]] nine years earlier.<ref name=adams /> |
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At mid-span, the bridge is {{convert|44|ft|4|in|m}} wide,<ref name="sutherland" /> 4.7 metres above [[mean high water springs]] and 9.2 metres above [[chart datum]].<ref name="spung">{{cite web|url=http://www.southamptonvts.co.uk/files/spung-sec-2.pdf|title=Southampton Port Users Information & Navigation Guidelines|publisher=Associated British Ports|accessdate=2008-08-29}}</ref> The bridge is 148 metres long in total, and the supporting piers are up to 32 metres apart.<ref name="hewson">{{cite book|last=Hewson|first=Nigel R.|title=Prestressed Concrete Bridges: Design and Construction|publisher=Thomas Telford|date=2003|url=http://books.google.co.uk/books?id=BrlVKt_hOT0C&pg=PT41&lpg=PT41&dq=%22Northam+Bridge%22+span&source=web&ots=GHCvKgk6e2&sig=RgeOH28DkN-0F0Ku0MXZIZZSHZw&hl=en&sa=X&oi=book_result&resnum=7&ct=result|isbn=0-7277-3223-4}}</ref> |
At mid-span, the bridge is {{convert|44|ft|4|in|m}} wide,<ref name="sutherland" /> 4.7 metres above [[mean high water springs]] and 9.2 metres above [[chart datum]].<ref name="spung">{{cite web|url=http://www.southamptonvts.co.uk/files/spung-sec-2.pdf|title=Southampton Port Users Information & Navigation Guidelines|publisher=Associated British Ports|accessdate=2008-08-29}}</ref> The bridge is 148 metres long in total, and the supporting piers are up to 32 metres apart.<ref name="hewson">{{cite book|last=Hewson|first=Nigel R.|title=Prestressed Concrete Bridges: Design and Construction|publisher=Thomas Telford|date=2003|url=http://books.google.co.uk/books?id=BrlVKt_hOT0C&pg=PT41&lpg=PT41&dq=%22Northam+Bridge%22+span&source=web&ots=GHCvKgk6e2&sig=RgeOH28DkN-0F0Ku0MXZIZZSHZw&hl=en&sa=X&oi=book_result&resnum=7&ct=result|isbn=0-7277-3223-4}}</ref> |
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==References== |
==References== |
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{{Reflist}} |
{{Reflist}} |
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==External links== |
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*[http://www.plimsoll.org/resources/scclibraries/3265.asp Image of the second (iron) bridge)] |
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{{Buildings in Southampton}} |
{{Buildings in Southampton}} |
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Revision as of 12:55, 14 May 2012
Northam Bridge | |
|---|---|
.jpg) The bridge from the eastern (Bitterne Manor) bank | |
| Coordinates | 50°54′54″N 1°23′10″W / 50.915°N 1.386°W |
| Carries | 4 lanes (road) |
| Crosses | River Itchen |
| Locale | Northam, Bitterne Manor (both in Southampton) |
| Maintained by | Southampton City Council |
| Characteristics | |
| Total length | 148 metres (485 ft 7 in) |
| Width | 13.5 metres (44 ft 3 in) |
| Longest span | 32 metres (105 ft 0 in) |
| No. of spans | 5 |
| Piers in water | 4 |
| Clearance above | open |
| Clearance below | 9.2 meters (30 ft 2.2 in) |
| History | |
| Construction start | 1796 (original); 1954 (current) |
| Construction end | 1799 (original); 1954 (current) |
| Opened | 1799 (original); 1954 (current) |
| Location | |
 | |
The Northam Bridge is a road bridge across the River Itchen in Southampton, England, linking the suburbs of Northam and Bitterne Manor. The current bridge was the first major prestressed concrete road bridge to be built in the United Kingdom.[1] The bridge carries the A3024 road as a dual carriageway, with two lanes on each carriageway.
History
Prior to the construction of the Northam Bridge, the southernmost bridge across the River Itchen was at Mansbridge.[2] Mansbridge was the lowest crossing point of the river until the early 18th century, when the Itchen Ferry began operating between Woolston and St Mary's, downriver of Northam.[2]
The Northam Bridge was the brainchild of David Lance, who acquired land in Bitterne and built Chessel House there in 1796.[2] Realising that access to his land was poor, he encouraged the building of a bridge linking Bitterne Manor to Northam, together with roads from the bridge to Botley and a further bridge over the River Hamble in Bursledon (and onwards to Portsmouth), with the fork between the Bursledon and Botley roads passing close to Chessel House.[2] The Northam Bridge Company was formed in 1796, funded mainly by Portsmouth businessmen.[2]
The new route between Portsmouth and Southampton would be four miles (6 km) shorter than travelling via Mansbridge, and as a result the proposal to improve transport between the two important port cities was keenly supported by the Admiralty, especially since this was the time of the Napoleonic Wars.[2] Consequently when the Northam Bridge Company sought an Act of Parliament to build a bridge, the Act was passed quickly.[2]
The new roads and bridges were built in 1799, and were originally operated as toll roads. The first Northam Bridge was of wooden construction.[2] The wooden bridge was replaced in 1889 by an iron bridge[3] at a cost of £9,000.[4]
The bridge remained a toll bridge until 1929[3] when the ownership was transferred from the private sector to the Southampton Corporation. [5] It was this change of ownership that allowed the first bus route across the River Itchen to be established in Southampton; Southampton Corporation decided against extending the existing tram lines across the bridge, opting instead to establish a double-decker bus service.[5]
The iron bridge was replaced in 1954 with a third bridge, made of prestressed concrete, and it is this bridge that still stands today.[1][3] The third Northam Bridge was the first major prestressed concrete road bridge to be built in the UK.[1]
Construction and dimensions
The parapets of the first (wooden) bridge were 24 feet (7.3 m) apart, as were those of its wrought-iron successor.[4]
The third bridge utilised the latest technology available at the time but the style of the bridge was of the pre-war era.[6] The main deck structure has transverse diaphragms and narrowly spaced beams, which were pre-cast on site using deflected cables.[6] Pre-cast, pre-stressed slabs, known as junction slabs or continuity slabs, were placed between the tops of the beams by transverse stressing over a length where the flanges of the tees were removed.[6] These, together with in situ diaphragms between the ends of the beams, allowed the deck structure to be made continuous for live and superimposed loads.[6] After the junction slabs were in place, the main beams were post-tensioned through the diaphragms.[6]
The consulting engineers responsible for the new bridge were Rendel Palmer & Tritton, the same firm used for Waterloo Bridge in London nine years earlier.[4]
At mid-span, the bridge is 44 feet 4 inches (13.51 m) wide,[6] 4.7 metres above mean high water springs and 9.2 metres above chart datum.[7] The bridge is 148 metres long in total, and the supporting piers are up to 32 metres apart.[8]
References
- ^ a b c "History of Concrete Bridges". www.cbdg.org.uk. Retrieved 2008-03-11.
- ^ a b c d e f g h Holt, John (February 1992). A bend in the River. Southampton: Bitterne Local History Society.
{{cite book}}: Unknown parameter|coauthors=ignored (|author=suggested) (help) - ^ a b c "Northam Bridge Approach - PortCities Southampton". www.plimsoll.org. Retrieved 2008-03-11.
- ^ a b c Adams, H.C. (01 May 1955). "NEW NORTHAM BRIDGE, SOUTHAMPTON" (PDF). Institution of Civil Engineers Proceedings. 4 (3): 290–298. doi:10.1680/iicep.1955.11382. Retrieved 14 May 2012.
{{cite journal}}: Check date values in:|date=(help); Unknown parameter|coauthors=ignored (|author=suggested) (help) - ^ a b Gould, Peter. "Southampton Corporation Transport: 1898-1986". Peter Gould. Retrieved 2008-03-11.
- ^ a b c d e f Sutherland, R. J. M. (2001). Historic Concrete. Thomas Telford. ISBN 0-7277-2875-X.
{{cite book}}: Unknown parameter|coauthors=ignored (|author=suggested) (help) - ^ "Southampton Port Users Information & Navigation Guidelines" (PDF). Associated British Ports. Retrieved 2008-08-29.
- ^ Hewson, Nigel R. (2003). Prestressed Concrete Bridges: Design and Construction. Thomas Telford. ISBN 0-7277-3223-4.
External links
