PRECAST CONCRETE, ITS USES AND ALTERNATIVE CONSTRUCTION MATERIALS IN HDB UPGRADING WORKS

Abstract

This study aims to provide practical information on the usage of precast concrete in the construction industry, particularly for HDB upgrading works in Singapore. Another objective of this study is to illustrate the necessity of careful planning and detailing to ensure smooth workflow and successful completion of projects. In addition to literature reviews and interviews with building professionals in the industry, demonstrations with real-situational case studies on two types of structural upgrading projects are included in this report, with detailed illustrations on the launching process of Space Adding Item (SAI) and hoisting procedures for Lift Upgrading Programme (LUP). The case studies provide an in-depth description of the design characteristics and application of precast concrete in SAI works and LUP works. Considerations for the choice of materials for lift upgrading construction would depend on the speed of construction, cranage access and the cost factor. Usage of steel for new lift shaft is recently adopted but there exist possible problems and preventive measures which require further deliberation. Relating to the present findings, a number of areas deserving future attention have also been identified in this study. Optimum repetition of components is required to maximise the benefits of precast technology, such as cost effectiveness. Builders adhering to the design concepts, procedures and standard guidelines would enable smoother workflow in the precast erection process. These work processes illustrate the convenience and ease of using precast technology, with other intangible benefits like shorter completion time and better quality works. Building alignment issues in precast upgrading works must also be taken into account for this technology.