HLY-MNT-01: Precast Concrete Pipe Mold Daily Cleaning & End-Ring Alignment Protocol

1. Mandatory 15-Minute Post-Demolding Cleaning Rule

Within 15 minutes of pipe stripping, crews must remove cement paste with pneumatic scrapers and curved brass blades.

Zero Hammering Policy: Striking formwork plates with steel sledgehammers is strictly prohibited! Use copper drifts or polyurethane mallets only.

Measure runner ring circularity weekly using calipers across 4 diameters; maximum allowable out-of-roundness is $\le$ 1.0 mm.

End squareness deviation must not exceed $\le$ 1.5 mm for drainage pipes and $\le$ 0.8 mm for jacking pipes.

Check longitudinal flange mating clearance with feeler gauges; gap must not exceed 1.5 mm.

Replace EPDM heat-resistant gasket in flange grooves every 100 production cycles to prevent joint slurry blowouts.

Apply heavy-duty paraffinic rust-inhibiting oil on molds idle for $>10$ days.

Support molds on wooden dunnage timbers (height $\ge$ 150 mm) on level concrete pads. Never stack more than 2 tiers high.

Within 15 minutes of pipe stripping, crews must remove cement paste with pneumatic scrapers and curved brass blades.

Zero Hammering Policy: Striking formwork plates with steel sledgehammers is strictly prohibited! Use copper drifts or polyurethane mallets only.

Measure runner ring circularity weekly using calipers across 4 diameters; maximum allowable out-of-roundness is $\le$ 1.0 mm.

End squareness deviation must not exceed $\le$ 1.5 mm for drainage pipes and $\le$ 0.8 mm for jacking pipes.

Check longitudinal flange mating clearance with feeler gauges; gap must not exceed 1.5 mm.

Replace EPDM heat-resistant gasket in flange grooves every 100 production cycles to prevent joint slurry blowouts.

Apply heavy-duty paraffinic rust-inhibiting oil on molds idle for $>10$ days.

Support molds on wooden dunnage timbers (height $\ge$ 150 mm) on level concrete pads. Never stack more than 2 tiers high.