Indonesian officials have named the firms involved in building, maintaining and repairing the bridge that suffered a catastrophic collapse last November.
Indonesian consultant Perentjana Djaja designed the IRupee104bn (£7.4M) bridge, which was checked by Japanese engineering firm Pacific Consultant International on behalf of client Kutai local authority.
The local authority was client for the maintenance and repair work for the 10 year old structure.
Contractor Hutama Karya built the bridge and maintenance firm Bukaka Teknik was carrying out work when the bridge collapsed, official investigator Bandung Institute of Technology structural engineering research group professor Bambang Budiono confirmed to NCE.
Three span bridge
The three-span Kutai Kertanegara suspension bridge - which has an overall length of 710m including its viaducts - collapsed into the River Mahkam in East Kaliminta province leaving only the cables and tower in place. At least 20 people died and many more were injured.
Budiono worked on the official report commissioned by the Indonesian Department of Public Works. In it, Bukaka Teknik’s working methods are criticised.
The firm was attempting to restore the deck’s longitudinal camber when it dropped. Bukaka Teknik engineers then failed to follow procedure - such as analysing the effects of correcting the jacking process - a factor which contributed to the collapse, says the report.
Police are questioning one Bukaka Teknik employee and two Kutai local authority employees regarding the collapse.
The consultants and contractors involved in the bridge’s construction were unavailable for comment.