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Steel Multiplate Structures

CSP Pacific is New Zealand’s only manufacturer of Steel Multiplate culverts. Corrugated galvanised steel culverts have been used around the world for well over 100 years and are a proven option for typical civil infrastructure applications. Steel Multiplate is a cost-efficient culvert offering up to a 50 year design life in low corrosion environments in New Zealand.

For more information on the durability, performance and methods for predicting the service life of CSP Pacific’s range of Multiplate structures click here.

For more demanding applications CSP Pacific also offer products with extended service life - Aluminium Multiplate (75 years) and Multiplate 100+ (100 years). Steel Multiplate culverts can span up to 10m with spans over 8m achieved by using coarse backfill compacted to 90% minimum. For spans exceeding 10m refer to CSP Pacific’s SuperCor® information.

Application Versatility

The versatility of Multiplate structures is limited only by engineering inventiveness. Traditional uses include culverts - small and large, bridges, storm drains, pedestrian and stock underpasses. However, other applications include mine and tunnel portal protection, conveyor housings, water tanks, caissons, underground storage facilities, and even wineries.

Cost Benefits

Steel Multiplate installation can provide many advantages:

  • Cost-efficient and convenient culvert option offering service life of up to 50 years.
  • Culverts are designed by Project Engineers, however  CSP Pacific can review the structural design and issue Producer Statement PS2 (Design Review).
  • Fast economical job completion.
  • Simple assembly – please note the project requires engineering supervision and the backfilling of the structure requires skill and experience.
  • Low equipment costs for assembly due to light weight of average plate, i.e. less than 150kg.
  • Pre-assembly reduces inconvenience and cost to maintain existing services.

Ease of Installation

Easy installation of Steel Multiplate culverts offers very real benefits to specifiers in both normal and difficult situations. The easily handled corrugated plate system can be erected on-site - an ideal solution for remote areas where access is difficult - or delivered to site fully assembled if access and transport regulations allow, where fast job completion is vital.

Multiplate structures derive their strength through interaction of the surrounding backfill. Design and supervision of this should be conducted by an experienced engineer. The site engineer is to ensure that assumptions made at the design stage are present on site and that backfilling is in accordance with the specification.

Standards and Approvals

Design, manufacture and Installation requirements for Steel Multiplate structures are specified in AS/NZS 2041: Buried Corrugated Metal structures. This is a joint Australian and New Zealand Standard, and has several parts. Those applicable to Steel Multiplate are as follows:

  • AS/NZS 2041.1:2011 Buried Corrugated Metal Structures - Part 1 Design Methods
  • AS/NZS 2041.2:2011 Buried Corrugated Metal Structures - Part 2 Installation Methods
  • AS/NZS 2041.6:2011 Buried Corrugated Metal Structures - Part 6 Bolted Plate Structures

Useful links

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