In a time-constrained environment, when faced with many requests for product approvals, the key question then becomes what parameters should a designer consider when asked to approve alternatives presented by contractors, particularly when contractors are trying to optimise the product purchase cost and keep construction costs down?
When culverts beneath a rail line are replaced, operators often struggle to construct a firm base for the culvert base to be founded especially when in majority of cases the subgrade materials are of inferior quality. Deep excavations and backfill are often required which is time consuming and could potentially prolong the closedown timeframe. The Presto GEOWEB® load support system will provide rail operators an economical and time saving solution by reducing both the excavation and backfill requirements.
Fouled or contaminated railway ballast is material recovered from the formation containing broken ballast particles, soil fines and other contaminants deposited during normal rail operations. The disposal of this material is an issue for many rail authorities as it may contain hazardous hyd
Much of the 40,000km of rail track traversing our great Australian land was constructed at a time when minimal engineering input was considered and therefore much of it is built upon low quality formations which over time has settled, deformed and lost much of its load bearing capacity.
Rail in NZ runs over a prepared subgrade with adequate subsoil drainage installed parallel to the line, this is then topped with a typical AP100mm broken face hard ballast rock.
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