Ingenieur Vol 78 ingenieur 2019 apr (2) | Page 33

bad workmanship, defective or inferior quality materials used, negligence, etc.) Building Delivery (CFO/CCC) Stage a) Certifying without checking/visiting the project There have been a number of complaints from Local Authorities that the Submitting Person who signed the Form E for the application of a CFO had done so without visiting the site and some did not even know the location of the site for small projects in rural areas. The case of the structural failure of Government housing flats (a prefab system from a Korean company) is an example where the local consultant certified Form E without active involvement in the project. change and it is not noticeable to authority. Examples of such failures are the Singapore New World Hotel collapse in 1986 and Korea’s Sampoong building in 1995, where changes to the use of the buildings introduced extra loading due to air conditioner units, water tanks, exterior tiling, raised floors, etc. Recommendation a) Strengthen UBBL to make it a requirement to submit structural plans to the Local Authority for endorsement of any renovation that incurs extra loading. This will imply the engagement of an engineer as only a PE can sign on the structure plan. Since it is only to deposit the plan with Local Authority, it does not impose any bureaucracy in the process. Recommendation Maintenance and Management Stage a) Regular reminders to PEs on their responsibility and accountability when certifying works and publicise cases in BEM publications or press conferences by the BEM/Minister. a) Incompetent technical personnel handling refurbishment and or repair structural works b ) Take stern action against PEs who do not act professionally or ethically. c ) The contractor’s column in all Form Gs where contractor column appears, must be signed by the contractor’s company director and the site manager jointly. d) Take stern action against individuals (e.g. directors and site/project managers) of contracting companies that act irresponsibly or fraudulently. Extension and Renovation Works a) Performing extension or renovation works without checking on design capacity of structure This is a common feature whereby an owner renovates a structure without the engagement of an engineer to check against its carrying capacity due to additional loading. Certain internal renovations need not require approval from a Local Authority even if it involves extensive material Repair or refurbishment works are of ten overlo oke d from the s truc tur al s afet y aspect whereby works are often carried out by incompetent supervisors or left to the contractors themselves. In the case of the Johor Bahru Lumba Kuda 16-storey flats’ roof, a 500,000 litre pressed steel water tank collapsed in 1993 killing a youth and damaging several cars, and residents were forced to move out for a day. Although the tank was just repaired by replacing new struts, the corroded cleats joining the strut and the tank plate were not replaced. Hacking and re-joining the struts and the plate made the joints weaker and they failed two weeks after the completion of the repair. The technical assistant, as the most senior technical officer from Jabatan Perumahan Negeri had no proper training or experience to pre-empt such risk and relied upon contractor’s experience to do a proper job. Recommendation a) Repair of structural elements should be managed by qualified technical personnel. For complicated structures or slopes, PEs must be 31