Orwell Bridge

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Orwell Bridge
Orwell-Bridge.jpg
The Orwell Bridge from Orwell Country Park
Coordinates 52°01′37″N1°09′52″E / 52.026909°N 1.16449°E / 52.026909; 1.16449
OS grid reference TM163445
CarriesMotor vehicles (A14 and A12)
Crosses River Orwell (Freston Reach), B1456
Locale Ipswich (east) and Wherstead (west)
Maintained by National Highways
Preceded by Stoke Bridge
Characteristics
DesignTwin box girder bridge
Material Pre-stressed reinforced concrete
Total length1,287 metres (4,222 ft) [1]
Width24 metres (79 ft)
Height43 metres (141 ft)
Longest span190 metres (620 ft)
No. of spans18
History
Architect Frederick Gibberd Partners
Engineering design by Sir William Halcrow & Partners [2]
Constructed by Stevin Construction B.V.
Fabrication byHøsveis & Bofa
Construction startOctober 1979
Construction endApril 1982
Construction cost£23.6m
Inaugurated17 December 1982
Location
Orwell Bridge

The Orwell Bridge is a concrete box girder bridge just south of Ipswich in Suffolk, England. Opened to road traffic in 1982, the bridge carries the A14 road (formerly the A45) over the River Orwell.

Contents

History

Design

The main span is 190 metres which, at the time of its construction, was the longest pre-stressed concrete span in use in the UK. The two spans adjacent to the main span are 106m, known as anchor spans. Most of the other spans are 59m. The total length is 1,287 metres from Wherstead to the site of the former Ipswich Airport. The width is 24 metres with an air draft of 43 metres; the bridge had to be at least 41 metres high. The approach roads were designed by CH Dobbie & Partners of Cardiff, [3] later bought by Babtie, Shaw and Morton then Jacobs in 2004.

The bridge is constructed of a pair of continuous concrete box girders with expansion joints that allow for expansion and contraction. The girders are hollow, allowing for easier inspection, as well as providing access for services, including telecom, power, and a 711mm water main from the nearby Alton Water reservoir. The necessary inspections still cause major disruption to traffic every six years; during the inspection in the summer of 2005, the delays caused by lane closures and speed restrictions added between 30 and 60 minutes to journey times during the peak commuting periods.[ citation needed ]

Approach from the east in November 2006, north of Orwell Country Park at the Shell Orwell services Looking West - geograph.org.uk - 280099.jpg
Approach from the east in November 2006, north of Orwell Country Park at the Shell Orwell services

The bridge design took into consideration the impact on the Orwell Estuary, as well as the needs of the port of Ipswich. The location close to the southern edge of Ipswich was deemed convenient for the industrial areas of the West Bank Terminal and Ransomes Industrial Estate on the eastern end. The bridge was set at an angle to the river to get the best relationship to the surrounding terrain.

The air draft of the central span was chosen to be as low as possible without adversely affecting port operations. Although some have said that the resulting hump affects visibility and road safety, there have not been enough incidents causing injury for the Highways Agency to identify it for greater detailed investigation and possible amendments. [5] The consulting engineers were Sir William Halcrow and Partners. Frederick Gibberd Partners worked on the project to ensure the bridge was as sympathetic as possible to its surroundings, with the final design winning the approval of the Royal Fine Art Commission.

The Department for Transport funded the project and, partly because of the bridge, paid for radars and cameras to be installed at the port's Orwell Navigation Service to monitor the river and the bridge.

Construction

Pilings were sunk 40 metres into the river bottom; Pigott Foundations of Ormskirk drilled 1142 piles; the main contractor of the substructure was Stevin Construction B.V., a Dutch company. The main span was constructed using a balanced cantilever technique, casting sections on alternating sides of the pier in a weekly cycle. Høsveis & Bofa of Hønefoss in Norway helped form the box girder (steelwork). The roller bearings were from Maurer AG of Germany. Mageba UK (Swiss) of Bicester supplied the bridge bearings and expansion joints. The pre-stressed concrete box girder sections had VSL tendons and GKN super-strand wire rope. The construction gantries were fabricated by Fairfield Mabey.

View in March 2010 A12 crossing over River Orwell , Ipswich , March 2010 - panoramio.jpg
View in March 2010

It was part of the first section of the Ipswich Bypass; the contracts for the approach roads were given to Costain (£10.7m, eastern) and Cementation (£9.3m, western). For this section of the bypass, Robert McGregor & Sons, subcontracting to Cementation laid 6,900m of concrete in 48 days with a slipform paver; Costain laid 10,400m of concrete in 31 days with a concrete train.

Construction of the bridge began in October 1979 and was completed 1 April 1982. It was opened on 17 December 1982 by David Howell, Baron Howell of Guildford, then the Secretary of State for Transport.

Maintenance

Bridge bearing replacement works were carried out by Jackson Civil Engineering Ltd over the weekend of 11–14 February 2011, during a 52-hour closure of the north deck, carrying the eastbound A14. The new bridge bearings were designed and manufactured by the engineering company, Freyssinet Ltd. [6]

In February 2014, a meeting of various agencies was held to review diversions when it is necessary for the A14 and Orwell Bridge to be closed. [7]

Speed limit

A permanent reduced speed limit of 60 mph was introduced in November 2015 for safety reasons. [8]

Due to high side-winds, the bridge is often closed during storms. [9] To reduce closure time and the pressure it imposes on local roads, in 2021 Highways England installed electronic variable speed limits on the bridge and the approaches each side. During certain high winds conditions, rather than closing the bridge, the speed limit can be reduced from 60mph to 40mph. [10] [11]

View from the air in February 2010 from an aircraft en route to Stansted from Prague Ipswich and the Orwell Bridge - geograph.org.uk - 1716129.jpg
View from the air in February 2010 from an aircraft en route to Stansted from Prague

Structure

The Stour and Orwell Walk passes under the bridge.

Usage

As of 2006 the bridge was used by 60,000 vehicles per day, about 83% of its capacity. [12] In 2006 it was predicted that the bridge is expected to be running over capacity by 2015. [13] By 2023, traffic levels had exceeded 67,500 vehicle per day. [14]

Incidents

Total closures

When the bridge is closed in both directions for more than a short period of time, normally as a safety precaution due to high winds, most of Ipswich's roads are brought to a near-standstill by diverted traffic. [15] [16]

DateDuration (hours)ReasonNote
1 December 2023 [17] 12 hoursRoadworksA vehicle carrying survey equipment on the Orwell Bridge during road works had a failed hydraulic unit, which had an extending platform, which was stuck under the bridges surface. A maintenance truck had to be called in from Yorkshire, which caused the worst traffic delays to date in Ipswich.
18 February 2022 [18] 12 hoursHigh winds Storm Eunice
30 April 2019 [19] 1.5 hoursPolice Incident
16 March 2019 [20] 4 hoursHigh winds
13 March 2019 [21] 8 hoursHigh winds Storm Gareth
29 November 2018 [22] 4 hoursHigh winds
24 January 2018 [23] 5+ hoursHigh winds Storm Georgina
18 January 2018 [24] 3 hoursHigh winds Storm Fionn
3 January 2018 [25] 17 hoursHigh winds Storm Eleanor
20 October 2017 [26] 8 hoursTraffic collisionFatal crash (6:45am to 2:50pm)
23 February 2017 [15] 5+ hoursHigh winds Storm Doris
22 November 2016 [16] [27] 5+ hoursHigh winds Storm Angus
28 March 2016 [28] 5+ hoursHigh Winds Storm Katie
1 July 2015 [29] 0–1 hoursSuicide / Attempted Suicide
15 April 2015 [29] 1-1.5 hoursRoad Traffic Collision
16 December 2014 [29] 1-1.5 hoursPedestrian
29 October 2014 [29] 0–1 hoursSuicide / Attempted Suicide
21 July 2014 [29] 0–1 hoursSuicide / Attempted Suicide
13 June 2014 [29] 0–1 hoursPedestrian
14 February 2014 [30] 5+ hoursHigh winds 2013–14 United Kingdom winter floods
28 October 2013 [31] 5+ hoursHigh winds St. Jude storm
4 March 2012 [29] [32] 5+ hoursRoad Traffic collisionBridge closed from 8pm on 4th to 3am on 5th.

The bridge appears in the 1987 Cold War drama The Fourth Protocol, in which two RAF helicopters are shown flying under it, and at the end of the 2013 film The Numbers Station.

The bridge appears in the background of a 2001 advert [33] for the AA motoring recovery service.

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References

  1. ↑ "The Orwell Bridge". National Highways. 20 May 2020. Retrieved 23 February 2023.
  2. ↑ IABSE
  3. ↑ IHT The Highway Engineer January 1983
  4. ↑ Shell Orwell
  5. ↑ Chenery, Roger (4 February 2005). "Road safety on the A14 around Ipswich". Highways Agency.
  6. ↑ "Freyssinet Bearing Replacement on A14 Orwell Bridge" (PDF). Archived from the original (PDF) on 16 August 2011. Retrieved 5 May 2011.
  7. ↑ "Ipswich/Suffolk: Summit to look at diversions when A14 and Orwell Bridge are forced to close". 28 February 2014.
  8. ↑ "Safety improvement work begins on Orwell Bridge". 12 October 2017.
  9. ↑ "Orwell Bridge in Suffolk closes for 10 hours due to wind". BBC News. 13 January 2020. Retrieved 12 August 2023.
  10. ↑ "A14 Orwell Bridge: New speed limit signs installed at Ipswich". BBC News. 31 March 2021. Retrieved 12 August 2023.
  11. ↑ Highways, National (11 January 2021). "Orwell Bridge new speed limits during high winds - National Highways". nationalhighways.co.uk. Retrieved 12 August 2023.
  12. ↑ "Newmarket to Felixstowe Corridor Study (Section 4.16)" (PDF). East of England Regional Assembly. Archived from the original (PDF) on 28 September 2007. Retrieved 19 June 2006.
  13. ↑ "Port of Felixstowe South Reconfiguration Evidence (Section 7.4)" (PDF). Planning Inspectorate. Retrieved 19 June 2006.
  14. ↑ "Manual count points - Site number: 38454". Department for Transport. Retrieved 3 August 2024.
  15. 1 2 "A14 Orwell Bridge to stay open today as region deals with aftermath of Storm Doris". 24 February 2017.
  16. 1 2 "Orwell Bridge fully reopens after high winds closed A14 over the river and caused traffic disruption for thousands around Ipswich".
  17. ↑ "Recap after the Orwell Bridge was closed". East Anglian Daily Times. 1 December 2023. Retrieved 3 December 2023.
  18. ↑ "Storm Eunice traffic chaos as heavy winds and snow close roads and bridges across UK". inews.co.uk. 18 February 2022. Retrieved 18 February 2022.
  19. ↑ "Highways England on Twitter". Twitter. Retrieved 30 April 2019.
  20. ↑ "Highways England on Twitter". Twitter. Retrieved 20 March 2019.
  21. ↑ "Highways England on Twitter". Twitter. Retrieved 13 March 2019.
  22. ↑ "Highways England on Twitter". Twitter. Retrieved 29 November 2018.
  23. ↑ "Orwell Bridge CLOSED due to high winds". Ipswich Star. Retrieved 24 January 2018.
  24. ↑ Hirst, Andrew. "Will the A14, Orwell Bridge, close in Suffolk due to high winds? Suffolk police reopen the bridge". Ipswich Star. Retrieved 18 January 2018.
  25. ↑ Howlett, Adam. "A14 Orwell Bridge reopens before evening rush hour". Ipswich Star. Retrieved 5 January 2018.
  26. ↑ "A14 Orwell Bridge opens after being closed for 8 hours after fatal traffic collision". 20 October 2017.
  27. ↑ "Orwell Bridge in Suffolk re-opens".
  28. ↑ "Storm Katie wreaks havoc across the East".
  29. 1 2 3 4 5 6 7 "Orwell Bridge Closures". 21 December 2016.
  30. ↑ "Suffolk/Essex: Orwell Bridge due to re-open this morning following strong overnight winds".
  31. ↑ "Big storm: Orwell Bridge reopened in both directions as St Jude's storm begins to subside".
  32. ↑ No further details of this incident available from local news outlets such as East Anglian Daily Times
  33. ↑ Cookie's Classics (14 February 2018). AA Advert featuring Suffolk's Orwell Bridge, circa 2001 . Retrieved 12 September 2024– via YouTube.
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