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Broinspektion - träbroar
SP - Sveriges provnings- och forskningsinstitut, Trätek.
SP - Sveriges provnings- och forskningsinstitut, Trätek.
2004 (Swedish)Report (Refereed)
Abstract [sv]

Many modern timber bridges have been built in Sweden during the last ten years. This report is about Swedish timber bridges and methods for the inspection of the bridges. It also includes reports from some inspections of timber bridges. The relatively new timber bridges are in good condition. The most frequent problems and corrective actions regarding the bridges have been related to railings, surface treatments and connections. At close inspections of some timber bridges no serious damages were found that will reduce the performance during the next ten years. Timber bridge design has been improved throughout the years, and some of the defects found depended on shortcomings in details in the early bridges. Several bridges were not sufficiently maintained. Periodic cleaning is important for keeping the wood clean and dry to ensure a long life of the bridges. Defects of the inspected bridges were mainly related to cracks and delaminations, surface treatments, moisture contents, steel coatings, connections, pre-stressed steel bars, connections to abutments and pavings. The principally used field measuring method is the resistive moisture meter, as moisture is the most critical parameter for the decay of wood. The resistive moisture meter has good accuracy and is almost non-destructive, as the electrodes only cause small holes in the wood. Rot on the outside of beams can be found with a knife and on the inside with a drill. Less destructive methods for rot surveys are the Pilodyn for outer rot and Resistograph for inner rot, but they sometimes give measures that can be hard to interpret as wood is an inhomogeneous material with large natural variations. Key words: timber bridge, inspection, wood moisture meter, Pilodyn, Resisiograph

Place, publisher, year, edition, pages
2004. , 71 p.
Series
SP Rapport, ISSN 0284-5172 ; 2004:41
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-4652Local ID: 5224ISBN: 91-85303-19-4 (print)OAI: oai:DiVA.org:ri-4652DiVA: diva2:962290
Available from: 2016-09-07 Created: 2016-09-07Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
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