Definition - What does Steel Sleeve mean?
A steel sleeve can be defined as a steel casing pipe attached to the rammer using collets. Rammer is used in the pipe ramming method of trenchless pipe installation that uses a pneumatic hammer to ram the pipe into the soil.
Steel sleeves are used in unstable ground conditions or when boring under rail crossings and highways. The carrier pipe made of high-density polyethylene (HDPE) or polyvinyl chloride (PVC) can be later inserted into it.
Trenchlesspedia explains Steel Sleeve
Pipe ramming is an impact method that uses the impact of the hammer to drive the pipe into the ground. When ramming through unstable ground or when boring under embankments, major roads and railroads, steel sleeve is installed first after which the carrier pipe is inserted. Steel sleeve provides continuous ground support and protects the pipe from damage.
It can also be used when the carrier pipe is of material such as HDPE, PVC or PE which cannot be directly impacted. Pipe ramming is a versatile method that can be operated from a pit or from ground level as it does not require a thrust wall.