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Culverts and road pipes in PE – a safe, fast and durable solution for road and rail infrastructure
Extreme weather and increased water volumes increase the demands on capacity, operational reliability and service life. Our PE profile pipes are available in Ø600–Ø3000 mm, can be dimensioned for the required ring stiffness (incl. SN8), and are quickly installed with long lengths and low weight. The result is shorter construction time, lower life cycle costs and high uptime for traffic – both on road and rail.
KRAH technology – globally recognized quality
Our road pipes and culverts are manufactured using KRAH technology. The method provides a seamless, smooth inside and a profiled pipe wall that provides high rigidity with low weight. The pipes can be supplied with an integrated socket/tip, so that the joints are welded to a homogeneous and tight pipe system. The technology is used globally for large PE pipe in a number of ring stiffness classes (typically SN2–SN16).
KRAH- pipe enables tailored stiffness without unnecessary weight.
Instead of a thick, solid wall, the pipes are shaped with profiles/ribs and cavities. The geometry (rib height/distance) is tailored to the stiffness requirement, so that the pipe can withstand soil loads and cover with less weight and material – without sacrificing strength. In the KRAH literature, this is described as structured wall , and it can provide significant weight reduction vs. full wall at the same ring stiffness.
Why choose KRAH profile pipes from Haplast?
Short construction time provides maximum uptime
Low weight and delivery in 6 meter long jointable lengths, or pre-assembled lengths up to 24 meters, reduces construction time, simplifies traffic flow, provides fewer lifts and minimizes risk in the trench. The pipes are joined as standard with a socket and tip.
Capacity for wetter climates
The smooth, bright interior provides high hydraulic capacity, simplifies inspection and cleaning, and reduces the risk of deposits and blockages. The result is fewer downtimes and a plant that maintains its line profile better over time.
Long service life – low lip run costs
The PE material does not corrode, is impact resistant and can withstand significant internal and external loads for >100 years, which reduces both replacement needs and unforeseen maintenance costs. The pipes are dimensioned for the necessary ring stiffness, including SN8, and can withstand deformation at high soil pressure without cracking.
Adapted terrain and environmental considerations
We supply solid, sloping ends adapted to the landscape, and can integrate stream inlets, bends and fish ladders to meet requirements for both environmental considerations and practical aesthetics. Local materials can be used as backfill according to the installation instructions, which reduces both carbon footprint and construction time. The angle of the sloping edge can be adapted to local conditions. The pipes are available with internal diameters from 600mm to 3000mm.
Fish ladder
Haplast Fish Ladder is a culvert delivered with sand stoppers that facilitate fish migration
Stream inlet
Haplast stream inlet with grate. The stream inlet is dimensioned to fit the Hapast culvert and is joined together with a weld or sleeve and tip. The pre-assembled grate prevents larger objects from flowing into the culvert.
Bend
Some projects require road pipes or culverts to be laid at angles. We help you find good, durable solutions and can supply bends at any angle. The bends are adapted to the culverts and are easily joined together with a sleeve and spike.
KRAH profiles – what's the difference?
With KRAH technology, we dimension the wall structure so that you get the right stiffness without unnecessary weight. Here are three common profiles used in road pipes and culverts:
Public relations
PR profile has a smooth inside and a profiled outside. The smooth inside provides good hydraulic properties, while the profiled outside contributes to lower weight and high ring stiffness. PR profile can be laid in two layers.
OP
Omega profile (OP) is a stronger variant of PR. The profile type has a smooth inside and a stronger profiled outside, and is used where there is a need for higher strength and ring stiffness than a simpler profile structure provides.
Flat band
Flatband is a solid, smooth-walled profile type. It is very suitable where an aesthetic finish is desired on the road pipes, such as beveling according to the terrain.
Lasting solutions:
Internal dimensions from Ø600 mm to Ø3000 mm
Rig stiffness can be adapted to the project (including SN8)
Delivery lengths in jointable blanks from 6 m to 24 m
Joined with socket and tip or welded on site
Smooth and bright interior for hydraulic capacity and easy maintenance
Accessories such as solid, sloping ends, stream inlets, bends and fish ladders
Impact-resistant, corrosion-free and robust PE with a +100-year lifespan
