Auger boring, often called jack and bore, pushes steel casing horizontally under roads, highways, and rail lines while a rotating auger removes the soil inside it. It’s the standard method when a DOT or railroad requires cased crossings on line and grade. GriffinCo performs auger bores for utility contractors and owners across coastal Alabama, Mississippi, and Florida.
How Jack and Bore Works
- Bore pit. A launch pit is excavated and the boring machine is set on track at the planned line and grade.
- Jacking. Hydraulic jacks push steel casing forward, one section at a time, while the auger carries spoil back to the pit.
- Receiving pit. The casing breaks through into a receiving pit on the far side.
- Carrier pipe. The water, sewer, gas, or conduit line is installed inside the casing.
When Auger Boring Is the Right Call
- Road, highway, and rail crossings that require casing
- Gravity lines that need consistent line and grade
- Short to medium crossings in stable soils
Why Owners Specify It
- No surface disruption. Traffic and trains keep moving overhead.
- Casing protects the line. The carrier pipe is shielded from loads above.
- Accepted by DOTs and railroads. A familiar, permit-friendly method for crossings.
Have a crossing that needs casing?
To confirm or correct
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- Do you perform auger boring?
- Casing diameter range and longest bore completed
- Railroad or DOT crossings completed (ALDOT, MDOT, FDOT)
- Bore machine makes and models