Bangkok, May 20 – EXAT reveals 2 causes of concrete beam collapse accidents. While installing on Rama 2 Road, one person died on May 7, 2023, and additional safety measures were imposed.
Expressway Authority of Thailand (EXAT), Ministry of Transport revealed the progress of the investigation In case of an accident Precast Segment piece fell while installing on Rama 2 Road from Precast Concrete Segmental Box Girder Viaduct incident of the Rama 3 – Dao Khanong – Western Outer Ring Road Expressway Project, Contract 2 of EXAT There was an accident falling down. resulting in the death of 1 person and causing damage to the property of the motorway user On Sunday, May 7, 2023 at approximately 4:15 p.m.
Mr. Surachet Laopoolsuk, Governor of EXAT, revealed that from inspecting equipment and materials as evidence at the scene together with experts from the Engineering Institute of Thailand. It was found that the cause of the accident had 2 causes as follows.
Defective PT Bar material used. Causing it to be unable to support the weight of the lifted workpiece and torn down, although lifting this workpiece using 4 PT Bars can support up to 4 times the weight of the workpiece, but the PT Bar device, if used repeatedly, may fatigue in the material Or there may be smashing to have flaws (Flaw) or cracks within the material (Rupture) which cause the failure of the material when receiving high tension from carrying the workpiece. As for why there is fatigue or flaws in the material. In the process of taking the missing PT Bar to be tested in the lab.
Workers do not perform construction work in accordance with the construction process (Method Statement) accurately and completely. which is in the process of investigating the facts whether the action is correct and complete or not
While waiting for the accident investigation staff, EXAT has implemented another level of safety measures (Double Safety) to increase safety in all construction projects located in areas with traffic flowing throughout the project at present. and in the future. In this regard, EXAT had a discussion with the Department of Highways (Highway) on May 19, 2023 on safety measures for construction on Rama 2 Road, with additional short-term measures as follows:
It is stipulated that PT Bar materials be tested by Ultrasonic Testing (UT) or Magnetic Particle Testing (MT) every 30 span (pole span), instead of checking every 50 span.
Procedures for the installation of segments, all activities will be performed only during traffic blockage and night time and traffic has been blocked “only” until the wire pulling process is completed. To protect the lives and property of the people by publicizing to road users in advance.
Have the contractor on the scene change the PT Bar to a new set “whole set” and check the material certificate before issuing a certificate before starting work.
Add the installation of the Sensor system, the main equipment used to lift and hang the segment to monitor the working system and notify the limit of the lifting equipment.
Installation of CCTV cameras to inspect risky points in the operation of the launching structure equipment
. Related (EIT / Council of Engineers) to study the case of such an accident. To lead to the design of a segment lifting system that is the same standard in the future and measures to drive upgrading of contractor knowledge and supervisor Provide training for registration and certification to be able to work on large-scale projects of the Ministry of Transport.”
In the case of remedies for all 5 victims and 1 deceased, property damage has now been settled. And is in the process of negotiating the morale cost and the opportunity cost of one car owner, which ETA has ordered the contractor to heal the relatives of the deceased. injured person And the owner of the damaged car to be appropriate, fair and receive the most fairness, Mr. Surachet said in the end .-Thai News Agency
Source: Thai News Agency