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Multiplate : Multiplate : Steel Multiplate Structures

What is Multiplate?

Multiplate describes flexible, embedded, corrugated steel pipes assembled on site from corrugated steel or aluminium plates, which are curved according to the pipe shape by means of bolted joints.

What is SuperSpan?

SuperSpan structures are a development of the traditional Multiplate system and allow larger clear spans to be achieved.

What can Multiplate structures be used for?

Generally Multiplate structures are used for culverts and bridges in roads of all classes up to highways and service roads for heavy traffic. Multiplate have also been used for alternative projects such as the Kaikoura Winery. (photo to be provided)

What design standard is used for Multiplate structures?

This type of construction belongs to the category of flexible, embedded, corrugated steel pipes and are manufactured by CSP Pacific in accordance with AS/NZS  2041:998.

What are the advantages of Multiplate structures?

  •  Easy site handling of plates
  • Straightforward assembly
  • Low expenditure for construction
  • Short time of construction
  • Low long-term maintenance cost

What level of corrosion protection is applied at manufacture?

To ensure a long service life, Steel Multiplate is hot-dip galvanized in accordance with AS/NZS 2041:1998. Additional protection can be provided by installing a concrete invert (either at time of construction or later in the service life). If required, plates can be coated, epoxy painted and or cathodic protected.

Which service life is realistic for Multiplate structures?

Multiplate structures can be designed with a service life of 100 years to meet NZ Transport Agency requirements.

What is the minimum cover over a Multiplate structure?

Generally 1/6 of the span of the chosen profile, but not less than 0.60m

How long does the assembly of Multiplate structure take?

Refer to Assembly Times in the technical section of the document.

What end treatments are available for the inlet/outlet ends of the structure?

Square, bevelled, step bevelled and skew ends are all available. Refer to End Treatments in the technical section of the document for further information.

Which solution can be found if none of the standard profiles is practicable?

CSP Pacific is able to design special profiles for special purposes (crossing of railway lines, low construction heights, etc.) with variation of the radii of curvature and angle of aperture of the steel plates.


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> Technical Note: Multiplate Culverts – Aluminium vs Steel
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