Challenges to Quality Control in Bored Cast-In-Situ Piling in Growing Urban Environment

Abstract Extensive bored cast-in-situ piling work is being carried out in growing metropolitan and other large cities for foundations of multi-storeyed office and residential buildings, flyovers and for retaining deep excavations for basements. The roads are small, traffic is heavy, there are restri...
Ausführliche Beschreibung

Abstract Extensive bored cast-in-situ piling work is being carried out in growing metropolitan and other large cities for foundations of multi-storeyed office and residential buildings, flyovers and for retaining deep excavations for basements. The roads are small, traffic is heavy, there are restrictions on timings for movement of construction machinery and with all these limitations, the owners/clients require speedy construction of piled foundations to come ‘above ground’ for superstructure construction. Geotechnical consultants and piling contractors face tremendous challenges in urban environment in ensuring quality in piling work. The challenges relate to all aspects of piling work such as pile-bore retention during boring, pile tip zone cleaning, deciding socket lengths in deep weathered rocks, meeting the pile termination criteria, concreting without interruptions etc. In case of shoring piles for basement excavations, installation of anchors adds to a further challenge since they would penetrate in adjoining plot. Micropiles are also being extensively used without regard to their inherent limitations in installation and load carrying capacity. These aspects are discussed in the presented paper. Ausführliche Beschreibung