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Aluminium Multiplate Structures

CSP Pacific is New Zealand’s only manufacturer of Aluminium Multiplate structures. Corrugated aluminium plate culverts have been used around the world for over 60 years and are a proven option for many civil infrastructure applications. Aluminium Multiplate is fabricated from marine grade aluminium alloy, 5052-H34, offering a 75 year design life in most environmental conditions 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.

The standard 50 year durability requirement can normally be met by the more cost-efficient CSP Pacific galvanised steel Steel Multiplate range whereas the premium aluminium Multiplate 100+ culverts have been engineered for 100 year durability. Aluminium Multiplate culverts 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 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

Aluminium Multiplate installation can provide many advantages:

  • Extended durability culvert option offering 75 year service life.
  • Culverts are designed by Project Engineers however CSP Pacific can review the structural design and issue Producer Statement PS2 (Design Review).
  • Aluminium oxidation products look similar to the metal itself so there is no ‘rusty’ appearance.
  • Fast, economical job completion.
  • Simple assembly of the culvert - please note the project requires engineering supervision and the backfilling of the structure requires skill and experience.
  • Low equipment costs for assembly due to very light weight of average plate, i.e. less than 50kg.
  • Pre-assembly reduces inconvenience and cost to maintain existing services.

Ease of Installation

Easy installation of Aluminium 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 Aluminium Multiplate structures are specified in AS/NZS 2041: 2011 Buried Corrugated Metal structures. This is a joint Australian and New Zealand Standard with several parts. Those applicable to Aluminium 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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