Every cylinder-based pipe pusher has the same limitation: it works in strokes. Push, stop, retract, re-engage. Repeat every 3–15 feet for the entire length of the crossing.

Each restart breaks static friction — a spike of force transmitted into the pipe wall and bore face. On a 1,600-foot river crossing with 48-inch steel pipe, those spikes accumulate into measurable risk: bore face instability, pipe coating stress, and lost time.

The UNI-PF250 eliminates the cycle entirely. Its 4-track conveyor system grips the pipe and drives it forward without stopping. Dynamic friction only — lower, more predictable, and fully controllable from the operator cab.

The practical result on your project:

• No bore face pressure fluctuations
• No static friction events at restart
• No shock loads transferred to the pipe wall
• Consistent installation speed across the full crossing length

HDD Pullback Assistance
On large-diameter HDD crossings (36 inches and above), the UNI-PF250 is positioned at the exit side to push the pipe string while the drill rig pulls. This reduces tension load on the rig and prevents pullback failures on long crossings.

Microtunneling Drives
The UNI-PF250 feeds pipe continuously behind the TBM, maintaining steady face pressure and forward progress without interruption.

Pipe Jacking Operations
Used as primary or supplementary jacking force at the drive shaft, the UNI-PF250 sustains continuous pipe movement across the full drive length.

Direct Pipe Tunneling
In Direct Pipe method installations, the UNI-PF250 pushes a prefabricated steel pipeline simultaneously as a TBM excavates the bore face — completing bore and pipe installation in a single operation, with no separate pullback phase required.

Typical crossing types:

• River and waterway crossings
• Highway and road underbores
• Railroad crossings
• Urban infrastructure crossings where surface disruption is not permitted