Upset Forged Tie Rods
Unlike traditional forging in which a parent metal is heated and forged into a smaller dimension upset forging is a process by which the parent metal is increased in sectional area. In the case of ASDO anchors this allows the ends of a bar to be increased in section and threads cut or rolled onto the forged cylinder, this gives the advantage of reducing the stress in the thread. Only upset forged tie bars ensure that the shaft is the weakest part of a tie bar anchor. This has benefits as, in the unfortunate event of structural failure, the tie rod shaft will realise it‘s full elongation capacity giving greater warning of serviceability failure of the pile wall. The same upset forging process can also be used to form articulated ends on the tie bars such as eyes or spherical ends.
The choice of steel grade for tie bars depends on a number of factors, whilst the higher strength steel will always produce the lightest weight tie rod this may not be suitable for stiffness requirements, onsite welding or lead-times. Other grades of steel tie rods are available please contact Anker Schroeder to discuss further.