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Shotcreting and Large Diameter Sliplining
SAK`s Shotcreting Process Has Many Applications. The shotcreting process involves using air pressure to spray wet or dry concrete at a velocity sufficient to make the sprayed material adhere to targeted surfaces. Because shotcrete adheres well to varying types of surfaces, SAK frequently uses it in tunnel construction and pipe installation, sewer rehabilitation and repair, soil stabilization, and temporary or permanent excavation support. Another key use for shotcrete is in the repair of the aging culverts that are common throughout many parts of the U.S. Many culverts are constructed from galvanized steel that rusts and deteriorates with time. Unattended, these culverts may fail and collapse, with potentially devastating consequences to the community. By appropriately applying shotcrete to a deteriorated culvert, SAK can increase its dependability and strength, with minimal restrictions to flow volumes.
SAK’s large diameter sliplining process is semi-trenchless, requiring only minimal excavation for installation of access pits at insertion locations and smaller shafts or excavations for reinstatement of lateral connections.
SAK uses several different types of pipe material to slipline large diameter liner pipe into deteriorated host pipe. The materials and processes used vary, and generally depend on the specific needs of a project. Generally, the process involves using hydraulic jacks in an insertion pit to push a new, factory-made pipe into place. Sliplining is completed “train-style,” one section at a time, until the entire line segment is completely laid out. Finally, the annular space remaining between the host pipe and the sliplined pipe is grouted using a low strength, cement-like material. This locks the new pipe in place and eliminates the annular space.
Large diameter sliplining often provides cost-effective solutions to pipeline problems when slightly reduced pipe diameter is not a concern. Another major benefit of sliplining is that it can usually be done without bypass pumping or diverting an existing live flow from the line.
Interceptor pipelines in heavily congested areas or difficult-to-dig locations are ideal candidates for large diameter sliplining. SAK can help you determine when sliplining is your best overall choice for protecting and maintaining your community’s underground assets.