[CCMC 13556-R] CCMC Canadian code compliance evaluation
From: National Research Council Canada
11850 Valley Ridge Drive
|Product name:||Supportworks® Helical Foundation Systems and Devices|
|Code compliance:||NBC 2015, OBC|
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Code compliance opinion
It is the opinion of the Canadian Construction Materials Centre that the evaluated product, when used as an auger-installed steel pile in a foundation system in accordance with the conditions and limitations stated in this evaluation, complies with the following code:
National Building Code of Canada 2015
|ID||Code provision||Solution type|
|04-02-03-08-01-e-00||22.214.171.124.(1)(e) CSA G40.21, "Structural Quality Steel."||Acceptable|
|04-02-03-10-00-0-00||126.96.36.199.(1) Where conditions are corrosive to steel, ...||Acceptable|
|04-02-04-01-00-0-00||188.8.131.52.(1) The design of foundations, excavations a ...||Acceptable|
|09-04-01-01-01-c-01||184.108.40.206.(1)(c)(i) Part 9, or||Acceptable|
Ontario Building Code
Ruling No. 12-05-275 (13556-R) authorizing the use of this product in Ontario, subject to the terms and conditions contained in the Ruling, was made by the Minister of Municipal Affairs and Housing on 2012-05-17 pursuant to s.29 of the Building Code Act, 1992 (see Ruling for terms and conditions). This Ruling is subject to periodic revisions and updates.
The above opinion is based on the evaluation by the CCMC of technical evidence provided by the evaluation holder, and is bound by the stated conditions and limitations. For the benefit of the user, a summary of the technical information that forms the basis of this evaluation has been included.
Product nameSupportworks® Helical Foundation Systems and Devices
The shaft is manufactured into lead sections with helical plates and extension sections either with helical plates (helical extension) or without helical plates (plain extension). Lead sections are available in lengths of 1 524 mm, 2 134 mm or 3 048 mm and extension sections are available in net lengths of 762 mm, 1 372 mm, 1 981 mm or 2 896 mm. The leads and extensions are connected together with a welded coupling and two bolts. One or more blades, up to a maximum of four blades, can be used for the lead sections. The coupling compression capacity is designed for end-to-end contact of the shaft sections. The helical pile central shaft consists of a pipe with an outside diameter of 73 mm and a 7.0-mm wall. The welded coupling consists of a tube with an outside diameter of 89 mm and a 7.1-mm wall thickness. The pile sections are coupled together with two 19.1-mm diameter bolts and nuts. The bolts and nuts are zinc-coated in accordance with ASTM A 153/A 153M-09, “Zinc Coating (Hot-Dip) on Iron and Steel Hardware.”
The helical plates are cut into a circular shape from 9.4-mm-thick steel plates and are formed into a true helix shape with outer diameters of 203 mm, 254 mm, 305 mm or 356 mm and are welded to the shaft lead and extension sections. Figure 1 shows a diagram of the product.
The steel shaft, blades and accessories for the product conform to CSA G40.21-04(R2009), “Structural Quality Steel,” while their galvanic coating with a minimum thickness of 610 g/m2 meets the requirements of CAN/CSA-G164-M92(R2003), “Hot Dip Galvanizing of Irregularly Shaped Articles.”
This evaluation is limited to products produced at the following plants:
|Product name||Manufacturing plants|
|Columbus, NE, US||Omaha, NE, US|
|Supportworks® Helical Foundation Systems and Devices||Product evaluated by the CCMC||Product evaluated by the CCMC|
Product evaluated by the CCMC Indicates that the product from this manufacturing facility has been evaluated by the CCMC
Conditions and limitations
The CCMC’s compliance opinion is bound by this product being used in accordance with the conditions and limitations set out below.
- The product under this evaluation is intended to be used as a foundation system to support the following types of construction:
- Single storey residential buildings within the scope of Part 9 of NBC 2015;
- Accessory buildings such as sheds, gazebos, sunrooms, carports, and decks/porches within the scope of Part 9 of NBC 2015.
Other applications are beyond the scope of this evaluation, wherein a professional engineer skilled in such design and licensed to practice under the appropriate provincial or territorial legislation must determine the pile capacity and other design parameters.
- The product may be used as a foundation system to support various constructions, provided that it is installed according to the manufacturer’s current instructions and within the scope of this Evaluation Report.
- When the product is installed in undisturbed or uniformly placed and well-engineered fill soils there is a direct relationship between the applied torque and the allowable compressive and tensile load. The Allowable compressive and tensile loads for the product table indicates the allowable compressive and tensile loads as a function of the applied torqueFootnote (1).
- When the auger-installed steel pile is installed in bedrock, the relationship between the applied torque and the allowable compressive and tensile load is not predictable. As a result, the allowable compressive and tensile loads have to be confirmed by on-site load tests. These load tests are also required if the allowable loads need to be greater than those stated in the Allowable compressive and tensile loads for the product table. The tests must be conducted under the direct supervision of a professional geotechnical engineer skilled in such design and licensed to practise under the appropriate provincial or territorial legislation.
- In all cases, a registered professional engineer skilled in such design and licensed to practise under the appropriate provincial or territorial legislation must determine the number and spacing of the auger-installed steel piles required to carry all the loads. A certificate attesting to the conformity of the installation and the allowable loads for the piles must be provided.
- The installation of the auger-installed steel pile must be carried out as per the manufacturer’s instructions. The anchors must be screwed into the ground using mechanized equipment. The anchor must be rotated into the ground with sufficient pressure applied downward (crowd) to advance the anchor one pitch distance per revolution. The anchor must be advanced until the applied torque value attains a specified value. Extensions must be added to the central shaft as needed. The applied loads may be tensile (uplift) or compressive (bearing). They are immediately ready for loading after installation.
- Where conditions (soil and environmental) are determined to be corrosive to steel, protection of the steel shall be provided. The determination of the presence of corrosive conditions and the specification of the corrosion protection shall be carried out by a registered professional engineer licensed to practise under the appropriate provincial or territorial legislation. If the determination of the presence of corrosive conditions is not completed before installation, the product, including all its accessories, is required to be hot-dipped galvanized, meeting the requirements of CAN/CSA-G164 (ASTM A123/A123M-17) with a minimum thickness of 610 g/m2, or another method that provides an equivalent level of protection and abrasion resistance deemed acceptable by the CCMC.
- To be permitted to install auger-installed steel piles for the product, the installer must be certified by Foundation Supportworks®. Using approved equipment, the installer must meet the uses and limitations specified in this Report. Each installer must carry a manufacturer approved card bearing their signature and photograph.
- Each auger-installed steel pile for the product must be identified with a label containing the following information: manufacturer’s identification and the phrase “CCMC 13556-R.”
This evaluation is based on demonstrated conformance with the following criteria:
|Criteria number||Criteria name|
|CCMC-TG-316216.01-15A||CCMC Technical Guide for Augered-Installed Steel Piles|
The product’s auger-installed steel piles were tested in accordance with:
- ASTM D 1143/D 1143M-07e1, “Standard Test Methods for Deep Foundations Under Static Axial Compressive Load,” and
- ASTM D 3689-07, “Standard Test Methods for Deep Foundations Under Static Axial Tensile Load.”
Testing was conducted on two different sites: the first had bedrock and clay soil and the second had only bedrock and sand soil. A series of 16 tests were performed at the two sites, 8 tension tests and 8 compression tests. The intent of the testing was to determine a correlation between the torque applied during installation and the allowable loads.
In both cases (compression and tension), the load tests for test piles founded in bedrock did not always provide adequate correlation to the actual maximum capacities for piles installed in bedrock. Based on this result, correlation should only be applied to piles installed in undisturbed soils or uniformly placed and well-engineered fill soils. The correlation may not be applicable in uncontrolled fill situations. In such conditions it will be necessary to perform load tests to determine the capacity of the piles.
The correlation between the torque applied during installation and the allowable loads for compressive and tensile loads is noted in the table below. The factor of safety used was 2.0.
|Applied torque||Torque correlated allowable soil capacity|
|678||500||10||2 250||10||2 250|
|1 356||1 000||20||4 500||20||4 500|
|2 034||1 500||30||6 750||30||6 750|
|2 712||2 000||40||9 000||40||9 000|
|3 390||2 500||50||11 250||50||11 250|
|4 067||3 000||60||13 500||60||13 500|
|4 745||3 500||70||15 750||-||-|
|5 423||4 000||80||18 000||-||-|
|6 101||4 500||90||20 250||-||-|
|6 779||5 000||100||22 500||-||-|
This evaluation is issued by the Canadian Construction Materials Centre (CCMC), a part of the Construction Research Centre at the National Research Council of Canada (NRC). The evaluation must be read in the context of the entire CCMC Registry of Product Assessments and the legislated applicable building code in effect.
The CCMC was established in 1988 on behalf of the applicable regulator (i.e., the provinces and territories) to ensure—through assessment—conformity of alternative and acceptable solutions to regional building codes as determined by the local authority having jurisdiction (AHJ) as part of the issuance of a building permit.
It is the responsibility of the local AHJs, design professionals, and specifiers to confirm that the evaluation is current and has not been withdrawn or superseded by a later issue. Please refer to the website or contact:
Canadian Construction Materials Centre
Construction Research Centre
National Research Council of Canada
1200 Montreal Road
Ottawa, Ontario, K1A 0R6
The NRC has evaluated the material, product, system or service described herein only for those characteristics stated herein. The information and opinions in this evaluation are directed to those who have the appropriate degree of experience to use and apply its contents (i.e., AHJs, design professionals and specifiers). This evaluation is only valid when the product is installed in strict compliance with the stated conditions and limitations of evaluation and the applicable local building code. In circumstances where no applicable local building permit is issued and that no confirmation of compliance ‘for use in the intended field application’ is undertaken, this evaluation is null and void in all respects. This evaluation is provided without representation, warranty, or guarantee of any kind, expressed, or implied, and the NRC provides no endorsement for any evaluated material, product, system or service described herein. The NRC accepts no responsibility whatsoever arising in any way from any and all use and reliance on the information contained in this evaluation with respect to its compliance to the referenced code(s) and standard(s). The NRC is not undertaking to render professional or other services on behalf of any person or entity nor to perform any duty owed by any person or entity to another person or entity.
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© His Majesty the King in Right of Canada, as represented by the National Research Council of Canada, 2022
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