I am developing a backfill specification specifically related to how to properly support and backfill a welded steel pipeline. I am facing several challenges. It is not always feasible to bring in aggregate or other engineered materials for fill under the pipe to provide support. Pipelines are typically miles off of an easy access road. Since its hard to compact native soils when a pipe is in the way I require some other support to hold up the pipe, contents, and soil loading and keep the stresses on the pipe within acceptable levels. I have looked into sandbags supports at certain spacing, and other supports like PipePillo or poured concrete. Woven plastic or burlap sandbags have been used in the pipeline industry but I have doubt on how much actual loading they can take. PipePillo seems like a good product but there isn't a long history of how these hold up over time. Concrete is not desirable in many ways, due to getting concrete onsite and waiting for the support to cure before backfill. Any advice for what others in the pipeline industry may do to support existing pipes prior to backfill? Any studies preformed to validate sandbag strengths? Anyone have difficulties backfilling existing pipes?
"Give me pipelines, or give me death!"
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