Talk:Myllysilta

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Finland

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Edited Google Translation of Finnish article

http://fi.wikipedia.org/wiki/Myllysilta

Myllysilta (Mill Bridge) (Sw. Kvarnbron) is located in Turku, and is one of the bridges over the River Aura. The current bridge was opened 19 September 2011. There are now still only two lanes for motor vehicle taffic and a combined pavement for pedestrians and cyclists in use.

On the sama site was previously a bridge with the same name, completed in 1975, which was closed after it sagged on 6 March 2010, it was demolished in May-July 2010. The new Myllysilta construction work began in the autumn of 2010. The roadblocks on the new bridge were removed on 19 September 2011 at 10 AM. All four lanes on the bridge are to be in use at the beginning of November 2011. Planting and stone work will not be finished until the spring of 2012.

Location

The street leading north-west from the bridge is named Koulukatu (School Street) and Myllytunneli (Mill Tunnel) is in the south-east. The bridge is about 93 meters long and 20 meters wide. The bridge's name refers to the Samppalinnan mylly (Samppalinna windmill), which is located near the bridge.

The bridge connects the city district of Martti to the city center. The bridge is for one-way traffic from the Martti district towards the Turku downtown. The traffic is likely to be about 20 000 cars per a day.

The current bridge

The new bridge, compleded in 2011, is a three-span steel girder bridge. The bridge contract sum was finally about 5.4 million euros, which was paid from the accident fund of the city of Turku. The bridge steel structures was manufactured by STX's shipyard in Turku, in the shipyard block halls, which were empty before the start of a newbuild.

About 12 000 short steel bars were welded in to the main steel beams, and a concrete deck was cast on the beams, after the beams were in their place on site. The steel used in the beams is special steel, which does not require any maintenance and handling. Tre are two concrete piers in the river, each equipped with two shuttle-shaped steel drums to prevent damage caused by current. The lining of the cylinders will be made of stone.

The bridge is 93 meters long and it's width is 20.5 meters. The complete steel structure weights 350 000 kg. The steel frame was made in three pieces, which were welded together and the whole steel frame was floated to its place in June 2011 along the River Aura under Martinsilta (Martti bridge) which lies downstream the river.

The bridge from 1975 to 2010

The first Myllysilta was on the same site and was completed in 1975. It was designed by engineering consultants Eero Paloheimo and Matti Ollila, Ollila was in charge of this bridge. The construction work of the bridge was completed in 1975, and it costed 15 million marks (FIM) and lasted for 1.5 years. The bridge started to groan soon after its completion. The consultants admitted they had done a sign (+/-) flaw in the calculations. The bridge was repaired inter alia in 1987, at the expense of the city of Turku. The city did not require the consultants any compensation, because it was estimated that trial costs would have been too high. It has also been suggested that incorrect and too heavy test load caused damage to the bridge. The bridge was examined in the 1970s by a quality expert Pentti Ståhlman, he stated that the problems were predictable back then, because of the brigdes structure was completely of wrong kind, it was not for example a beam structure, such as the nearby Martinsilta (Martti Bridge).

Some problems were identified in the Myllysilta as early as 1977, when in the summer heat it sagged 35 centimeters. VTT (=VTT Technical Research Centre of Finland) recommended in 1980 that the bridge should be checked on a monthly basis, as the positions of supporting bearings were incorrectly calculated. In the 1980s the bridge was closed on several occasions. Problems detected about ten years earlier were associated with the tensions in the bridge deck.

An Emeritus Professor in the sciece of bridge construction, Mr. Aarne Jutila, staded that there were known risks in constructing a low-arch bridge, and the decision-makers were warned, but in vain. The abutments for a low-arch bridge should have been made on bedrock, not on poor soil with driven piles. There are thin structures in the bridge, and therefore it is susceptible to errors. The bridge design was risky and the sign-flaw caused the position the basejoints to move in the opposite direction than was intended. He believes that Ollila's argument about the too heavy test load are erroneous.

Bridge closure

The bridge was closed in the morning of 6 March 2010 after passer-by detected a dip and reported it. In the evening of the sama day, the mid-bridge had sagged 94 centimeters, and it was feared that the bridge will collapse. It was estimeted, that the reason for the sagging was the collapse of the abutments. The constructors of the bridge, professors Eero Paloheimo and Matti Ollila, thought that the reason was the ice pressure in the River Aura. The demolition of the bridge was consireded probable even at this stage, and it was assumed that the new bridge will be completed early in the summer of 2011. On 9 March the sag of the bridge was 109 centimeters and it was estimated that the bride could sag a few tens of centimeters befoe it would collapse. On 31 March the sag was 127 centimeters in the most sunken section. At the end, the maximum sag was 143 centimeters.

The bridge was demolished 26 May - 21 July, 2010. While demolishing the bridge, it was found that the concrete was of poor quality and the concrete-grouting work was sloppy.

The city of Turku collects recovered memories of the bridge. The Turku 2011 Foundation collects a piece of cultural history with the European Culture Capital 2011 project named Turku – Narrated and Experienced.
END TRANSLATION

I made a google translation of the current (2011-11-05) article in fi-wiki and edited it slightly, so it would be more understandable than the original Google translation. I hope I succeeded. Htm (talk) 12:04, 5 November 2011 (UTC)[reply]

* I have updated the article with the important fact that the bridge no longer exists! The translation says: "demolished 26 May - 21 July 2010" There is a lot more to the story as apparently:

There were design flaws "Already risky design of the bridge was due to etumerkkivirheen(?) stem joints move in the opposite direction than was intended"
'decision-makers'(Authorities?) were warned of the danger "the bridge known to be at risk, from which decision-makers were warned, but in vain"
The bridge has been closed previously: "In the 1980s the bridge was closed on several occasions. [5]"
The bridge has been repaired previously: "The bridge is repaired, inter alia, in 1987"
Poor concrete and Workmanship(?): "found to have low-quality concrete and the injection was sloppy work [4]"

220.101 talk^\Contribs 07:15, 20 August 2010 (UTC)[reply]

The article is slightly updated. -Htm (talk) 12:49, 5 November 2011 (UTC)[reply]

External links modified (February 2018)

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