MAGNACORE Capacities Instructions

  • Product Family MAGNACORE
  • Subcategory ELEMENT
  • TIP Category DESIGN

TIP Description

This TIP is intended to demonstrate the order of magnitude capacities that a typical Magnacore element can withstand, accounting for grout column diameter.

Instructions for Use

  1. 1. Determine the Anticipated Compression and/or Tension Design Load.
  2. 2. Determine the Soil and Rock Profile.
    a. Assess whether the profile will require a clay, cross-cut, or button style bit to efficiently penetrate the soil or      rock materials
  3. 3. Based on the Bit Type, find the corresponding Max Compression Load that is sufficient to withstand the Design Load. Select the Bar to the left on that row as the design bar section.

Special Notes

  1. 1. Loading conditions such as unbraced length, lateral loads, moments, etc., should be evaluated by a competent person.
  2. 2. The capacities on this table are dependent on the soils. This table should only be used to make an initial bar selection, and fully designed by a competent person.
Bar Type Outside Diameter(mm) Inside Diameter(mm) MAX. TYPICAL BIT DIAMETER4 MAX. TYPICAL BIT DIAMETER1,2 MAX. TENSION LOAD1,3
Clay Bit Cross Cut Button Clay Bit Cross Cut Button
R32S 32mm 15mm 115mm 100mm 100mm 53 kips 46 kips 46 kips 27 kips
T40/20 40mm 20mm 150mm 150mm 130mm 83 kips 83 kips 71 kips 38 kips
R38N 38mm 18mm 150mm 150mm 130mm 85 kips 85 kips 73 kips 40 kips
T40/16 40mm 16mm 200mm 150mm 130mm 127 kips 91 kips 79 kips 47 kips
R51N 51mm 29mm 200mm 175mm 150mm 136 kips 117 kips 100 kips 56 kips
T52/26 52mm 26mm 200mm 175mm 150mm 145 kips 125 kips 109 kips 65 kips
T76/45 76mm 45mm 200mm 200mm 200mm 211 kips 211 kips 211 kips 135 kips
  1. 1.  The loads shown here are design loads and are intended to show an approximation of the strength of these materials. These estimates are based on the products that lntech currently supplies, and should not be used for other suppliers’ materials. Maximum test loads, and appropriate material strength reductions should be factored into the full structural capacity design. Do not use this table in lieu of a full structural design, which should be evaluated by a Professional Engineer. There should be a complete a structural design per project and element in accordance with the required design methodology, such as FHWA, PTI, IBC, AASHTO, and/or the methodology prescribed for the project. The loads are also based on a minimum f’c for the grout of 5,000 psi.
  2. 2.  These loads are based on a Test Load Factor of Safety of 2.0 x DL, and a maximum grout column diameters based on the bit diameters shown in the last three columns.
    Lower acceptable Test Load Factors of Safety may result in a lesser material section being required for the same strength. The actual structural capacity will be a function of the Magnacore steel bars, any steel casing, and grout column diameter actually used, as prescribed in a full design methodology.
  3. 3.  These loads are based on a Test Load FOS of 2.0 x DL. Lower acceptable Test Load Factors of Safety may result in a lesser material section being required for the same strength. The design will be controlled by the steel section and methodology chosen for design-it is not affected by the bit size or grout column diameter.
  4. 4.  The bit diameters shown here are typical recommended maximums for each type of bar that lntech carries. If a larger bit diameter is desirable for a specific bar size, lntech can obtain larger bit sizes than shown here. These maximums are based on typical industry practice and material stock. There can also be some instances where softer materials allow for larger bit diameters to be used, and instances where dense to hard materials may require a smaller bit diameter be used for penetration. The system will be advanced with energy from the Top of the Hole, which needs to transfer energy through the drill string-sometimes this can control the selection of bit or material size.

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Tim Comb


Tim is the President of Intech Anchoring and has 25 years of experience in the Civil Engineering and Geostructural Industry. Tim has developed extensive industry knowledge by working to support the needs of specialty contractors at each and every business level. Tim’s diverse industry background has given him exposure to a wide variety civil construction projects, ranging from the simplest residential applications to the most complex commercial and industrial projects. Coupled with a highly skilled and educated team, Tim focuses on providing the highest quality products and solutions to Intech Anchoring’s customers in order to consistently exceed expectations.