SHELF ANGLE (WEDGE) INSERTS
When cast into concrete, Wedge Inserts and Askew Head Bolts provide a secure and adjustable method for fastening shelf angles and other materials to concrete structures. The anchor's wedging action reduces slippage to a minimum. Shelf Angle Inserts allow vertical adjustment so veneers can be properly aligned despite construction tolerances in the building frame. No. 425 Wedge Insert: These heavy-duty malleable iron inserts have three holes for nailing to forms. Anchor loops are designed to take 3/4" (19 mm) reinforcing bars or anchor rods for increased anchorage in concrete. Available plain or hot dip galvanized. No. 427 Askew Head Bolts: The wedge-shaped heads of these steel bolts compliment the wedge-shaped inside face of the Wedge Insert. Available plain, electro-galvanized, or hot dip galvanized. Furnished with washers and nuts. SHIMS No. 442 Plastic Shims: High impact plastic shims with up to 4500
p.s.i. compressive strength. Available in 1/16" (1.59mm), 1/8" (3.17 mm),
and 1/4" (6.35 mm) thicknesses. Specify bolt size.
TEST DATA TEST 1 Method of Test: Two inserts of each kind were cast in concrete blocks
intended to be of 3,000 psi compressive strength. Companion 6" x 12" cylinders
tested at the time the inserts were tested showed an actual compressive
strength of 3,010 and 3,280 psi. The inserts were cast flush with the 16"
x 16" surface of blocks having a thickness of 10". A short length of 1/2"
reinforcing bar was placed thru the insert loop in the concrete. Blocks
were allowed to cure under room conditions for 28 days. Tests were made
loading the bolts in two different directions, directly outward (perpendicular
to the surface in which the inserts were cast Pullout), and also downward
(parallel to the same surface Shear).
5/8 Insert Failure at 9,320 lbs Concrete Broke around the inserts, then the concrete block cracked in the vicinity of the reinforcing steel bar. Insert did not break. 3/4 Insert Failure at 9,830 lbs Concrete broke around insert body and cracked at reinforcing steel bar. Insert did not break. 3/4 Long Insert Failure at 12,860 lbs Lips along slot of insert broke. Concrete broke along side of body. Insert did not pull out of concrete. SHEAR TEST: The tests pulling in a direction parallel to the surface of the concrete were made with a heavy angle block bolted at the mid point of the slot of the insert. The load was applied 2" out from the surface of the concrete. This would place some tension on the bolt, but would primarily tend to force the bolt to slip downward in the slot. The following results were obtained: 5/8" Insert 5,240 lbs Bolt slipped in slot 1/16"
TEST 2 Shear Test: METHOD OF TEST: ASTM E 488-76 Shear Strength of Anchor in
Concrete. Parallel to Concrete Face from top of Anchor.
Concrete Fractured in all specimens, but insert did not fail. Compressive strength of concrete used at 28 days was 5,860 psi. TEST 3 Pullout Test: METHOD OF TEST: ASTM E 488-76 Test for Strength of Anchors
in Concrete.
TEST 4 - 3/4" Long Insert Only Concrete was poured into molds measuring 11-1/2" x 20" x 20". One insert
was imbedded in the center of each mold. The inserts were malleable iron
to the ASTM A-47 Grade 32510 specifications. No additional reinforcement,
such as hairpins or rebar, were used in the concrete or inserts. The concrete
used was 5,000 psi high early mix with the following proportions:
Pullout tests were performed 6 days later when the concrete had reached a compressive strength of 4,758 psi as recorded from laboratory testing of 6" x 12" cylinders. A Pair of I-Beams were used to span the concrete molds with a steel channel acting as a bridge. The channel held a 30 ton hydraulic jack powered by a manual pump. A hardened 3/4-10 NC threaded rod ran through the jack and bridge threading into the nut in the insert. Pressure readings were obtained using a certified calibrated gauge connected to the pump. The inserts were pulled to failure: Specimen 1 11,030 lbs Specimen 2 10,140 lbs Malleable Iron Specifications: ASTM A47-B4 Ferratic Malleable
Iron Castings
NCMA TEK 93 - National Concrete Masonry Institute - Curtain and Panel
walls of Concrete Masonry. 1977
Heckmann Building Products Inc. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
No. 443 Steel Shims: Heckmann stocks steel shims in standard
sizes, and custom fabricates them for special applications. Shims should
be as long as the vertical legs of angles to prevent the angles from deflecting
under load. 1/16" (1.59 mm), 1/8" (3.17 mm), and 1/4" (6.35 mm) thick shims
are available in mill galvanized (1/8" max.), plain, hot dip galvanized,
and stainless steel.
PULLOUT TEST: Bolts were loaded in a
direction perpendicular to the surface with the bolts at the midpoint of
the slots in the inserts.