PROBLEM: Does your railway have spots where it just cannot maintain geometry? Are these geometry deficiencies related to chronic mud spots? Have you already tried surfacing and raising the track and yet there are still mud spots? Perhaps this is an area where you cannot maintain drainage in your ditches? Or a fill section where you observe outward bulging of the shoulders? The signs at the surface can often be mud pumping up through the ballast. This results in fouling of the ballast. Resurfacing may provide a month of relief, but does the next big rain or freeze thaw cycle result in yet another slow order? SOLUTION: Only Keller has a 40-year track record and thousands of track miles of experience dealing with problematic subgrades. The injection system pictured here has been used on Class One, Shortline, and Industry tracks throughout North America. The technique has been studied and accepted by TTCI in Pueblo, Colorado. Rail subgrade injection is included in AREMA Chapter One as well. Recent advances in the technology provide feedback on the subsurface conditions during the injection process. Recent advances in the grout mix have allowed treatment of wider soils types than previously considered. A side by side comparison of injection versus the installation of wood piles was provided in an AREMA paper and presentation. This paper was written with one of our Class One partners and discusses track constructed through organic peat bogs near the US Canadian border. The injection work was both more economical and provided a longer-term solution than installation of wood piles at the shoulder. Prior to the injection treatment, sections of track required monthly surfacing, if not more often. These sections of track have now gone through four freeze thaw cycles and are still maintaining geometry without surfacing.
展开▼
