Genius is simplicity
This truism has been probably become clear more than once to those who observed installation of helically corrugated metal pipes (HCMP).
Naturally – the entire process takes 2-3 hours at most. The technology is extremely simple, and any construction team is able to master it once gets acquainted with an erection drawing supplied with the pipes.
Milestones: bed early works, pipe laying, joint rimming, backfill compaction. A special equipment is not required except for an excavator and a wheel loader. The pipes are generally delivered as 13.5 m sections. In other words, they are almost ready-for-service.
User-friendly installation is not the main benefit though. HCMP are lighter than their RC counterparts and therefore lesser pressure is applied to the bed. Thanks to this feature, corrugated pipes are recommended when structures are erected on weak soil or at a site disturbed by mining operations.
HCMP, in addition, can be employed not only for culverts but also for pedestrian tunnels and conserved corridors, hydraulic structures and reinforcement / reconstruction of existing engineering facilities with the sheathing practice i.e. without stripping an existing embankment off.
HCMP production process
The HCMP production process is essentially a continuous helically winding of steel sheets from 500 to 3,500 mm dia. A lock-seam formed on the pipe circumference during shaping both contributes to stiffness and acts as an integrating coupler.
Polymer-coated HCMP advantages They do not require such additional zinc corrosion protective measures as concrete gutters, bituminous mastics and waterproofing geofabrics and membranes.
Polymer coating protects zinc from adverse mechanical impacts, earth currents, and chemical agents. This reduces the cost of artificial structures, eliminates the need for additional materials, extends service life up to 100 years, and virtually minimizes operating costs.