Ports and locks around the world depend on safe and reliable mooring systems. The choice of system is paramount to the safety of personnel and the protection of vessels and quayside and must meet the demanding requirements of today’s global economy.
The German building control authority (Committee for Waterfront Structures Harbours and Waterways) provides a comprehensive set of guidelines for all aspects of marine structures known as the ‘EAU’ and is recognized the world over for being an authoritative design guide.
Using FEA methods and computer simulations combined with decades of material experience, engineers at Anker Schroeder have been able to optimise all aspects of bollard design. In particular close attention has been paid to the increasingly important performance requirement of failure mechanism. Occasionally unforeseen loadings may be applied to the mooring system and it is important that these ‘over-loads’ are not transmitted fully to the quayside structure possibly causing failure to the wall.
ASDO bollards are anchored to the foundation structure using break-off bolts, these are designed to fail at a predetermined load thus protecting the main quay wall from over-load.
The design of break-off components follows the recommendations of the EAU and typically involves the tapering of the anchor bolts within a sleeve (variant 1) or strategically located seam welds to the bollard (variant 2). Anker Schroeder is able to adapt ‘break-off’ design to suit customer requirements.
For transmission of bollard load to the host concrete structure ASDO bolts generally have the anchorage end formed by forging. The profile of the forged end has been specially developed for this application to ensure tensile forces are safely transmitted to the surrounding concrete. As well as being more economical, a conical forged end creates a more favourable pressure distribution to the concrete than traditional washer plate and hex nuts.
ASDO500 upset forged tie bars were selected for the construction of a major new container port in Liverpool. The very high loads required large diameter bars to support…
At a glance Operating instructions, declarations of performance and test certificates to download.