How Long Does Sheet Piling last?
Steel sheet piling is considered a permanent solution since it can last for over 75 years without breaking down. For this reason, it is traditionally used around bridge piers and along embankments. It has a deep foundation that creates a lasting barrier that keeps dirt back during construction processes.
Watertightness of Sheet Piles
Steel sheet piles are per se impervious, the exception being the interlocks. A sealing system provides a cost-effective solution to control water seepage through the wall, for instance, to minimize the risk of settlement of adjacent property, or keeping excavations dry.
Each construction project is unique because ground conditions, water tightness requirements, installation methods, and so on, vary from site to site. Therefore, the choice of a sealing system must be made carefully considering all the specific constraints and requirements.
The integrity of a sealant will depend upon its suitability regarding the installation and the driving method, as well as the soil and water conditions.
Although welding of the interlocks is the most expensive solution, it yields a 100% watertight wall, which may be considered the ideal solution for underground car parks for instance.
Note that sealing systems can also prevent soil from clogging the interlocks, which in specific soils can ease the driving.