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Steel Multiplate Structures

CSP Pacific is New Zealand's only manufacturer of Steel Multiplate structures. These structures have been used in New Zealand and around the world for many years and are a proven option for many civil infrastructure applications.

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.

Proven Durability

Field investigations under varying in-service conditions over the past 50 years have given ample evidence of both structural and material durability. For standard applications under 'normal' water conditions a steel corrosion rate along the invert of 0.03mm to 0.07mm per year may be used to estimate time to first perforation. However, it should be noted that several remedial measures can be specified either before or after first perforation to ensure a continuing and efficient in-service life.

In situations where water quality is questionable or abrasive conditions are expected, we strongly recommend the use of a concrete invert. For further information contact your CSP Pacific Sales Engineer.

Cost Benefits

A Steel Multiplate Structure installation can provide many material and labour cost advantages.

  • Fast economical job completion.
  • Saves on design cost.
  • Simple assembly. Note: The project requires engineering supervision and the backfilling of the structure requires skill and experience.
  • Low equipment costs for assembly due to very lightweight of average plate, i.e. less than 15Okg.
  • Pre-assembly reduces inconvenience and cost to maintain existing services.
  • No structural or coating damage during transportation, handling and storage.

Ease of Installation

Installation techniques offer 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.

The assembly of Multiplate Structures is relatively simple.

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. At a minimum the following standards shall be met:

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

Standards and Approvals


Corrugated Steel Plate Structures are manufactured in accordance with the following specifications:

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

The range of structures in this document complies with the flexibility requirements of the above specifications. For larger structures, CSP Pacific offers the Super•Cor® range.

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