Page 285 - ZSi-Foster Product Catalog
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Concrete Inserts


                                Standard Finish: Pre-Galvanized (PG)
            Flared Wedge Concrete Inserts                       Unlike hook type inserts, higher stress concrete increases
                                                                VC9000 loading capabilities
            1 ⁄8" x 1 ⁄8" x 2 ⁄16" - 12 Gauge
                             11
                     7
             5
                                                                The VC9000's distinctive shape, consisting of a standard strut channel   Introduction
                                                                backed by an abruptly flared wedge, is a multi-purpose design. In addition
                                                                to incorporating the anchoring wedge, the design gives the insert an
                                                                extremely rigid beam strength. This stiff beam characteristic helps the
                                                                VC9000 to distribute concentrated spot loads over its embedded length
                                                                with maximum efficiency. Thus the VC9000 minimizes spot loadings on   Channel
                                                                the supporting concrete and simultaneously eliminates cracking problems
                                                                caused by sharp edges of hook anchors which act as stress risers.
                                                                The VC9000 does not rely on hooks or straps to anchor its load to the
                                                                concrete but rather distributes the load evenly upon mating surfaces of
                                                                concrete and insert wedge area. Hook and strap inserts have an anchoring   Channel Nuts &   Hardware
                                                                capacity determined by the anchor's resistance to pull out. Loading failures
                                                                of this type insert are generally characterized by straightening or tearing
                                                                of the hooks or straps during pull out If the anchors are welded to the
                                                                insert, then weld failure can further lower 6 the loading capacity. Increasing
                                                                the concrete's compressive strength above the minimum required does   General   Fittings
                                                                not increase the hook or strap style insert's loading capacity. Since the
                                                                VC9000's flared wedge locks the load within the encasing concrete, then
                                                                by increasing the concrete's strength, the VC9000's loading capacity is
                                        Uniform Design Load     increased. Because the VC9000 has this unique loading characteristic,
                Concrete Strength                               designers can take best advantage of the extra supportive strength
                                        per L.F. †    Lbs. (kN)  automatically provided by the modern higher strength concretes.   Brackets
                    3,500 psi              2,100 (9.34 kN)
                    4,000 psi             2,500 (11.12 kN)      NOTE: To reach maximum resistance to pull out of the nut in continuous
                    5,300 psi             2,650 (11.79 kN)      concrete inserts, a fitting should be mounted on the slot surface and the
            † Safety Factor = 3                                 rod or bolt connected. Without an exterior fitting, nut pull out resistance is   Beam   Clamps
                                                                reduced to approximately one half of the normal load rating. Pull out load
                                                                ratings for channel nuts are shown on page 74. VCN style concrete insert
                                                                nuts also work with VC9000 and can be found on page 276.

                               COMPARATIVE PERFORMANCE CHARACTERISTICS OF                                             Pipe & Conduit   Supports
                               CONCRETE INSERTS IN HIGHER STRENGTH CONCRETES
                      3000
                                               FLARED WEDGE INSERT                                                    Electrical   Fittings
                 INSERT ANCHORING CAPACITY,  UNIFORMLY DISTRIBUTED LOAD,  LBS./LINEAL FT. SAFETY FACTOR = 3  2000  AVERAGE FOR 12ga ANCHOR INSERT  Spring   Concrete   Steel  Inserts

                      2500









                      1500


                      1200
                                                                                                                      Rooftop   Supports
                                        AVERAGE FOR 14ga ANCHOR INSERT


                              3000      3500     4000      4500     5000      5500
                                       CONCRETE COMPRESSIVE STRENGTH , P.S.I.                                         Technical

                                             Uniform Design Load (S.F. 3)                                               Data
                                                                            7
                                                                                         5
                            9
                                                                                                      1
                                                   13
                  Hole Diameter:  ⁄16" (14mm); Hole Spacing - From End:  ⁄16" (21mm); Hole Spacing - On Center: 1- ⁄8" (48mm); Width: 1- ⁄8"(41mm); Thickness:  ⁄4" (6mm)
                                     In 3500 psi. concrete:  2100 lbs.   (9.4 kN) per L.F.
            www.zsi-foster.com       In 4000 psi. concrete:  2500 lbs. (11.3 kN) per L.F.                   – 285 –
                                     In 5300 psi. concrete:  2650 lbs. (11.9 kN) per L.F.
                                     WARNING: Cancer and Reproductive Harm Warning.  For more information go to www.P65Warnings.ca.gov.
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