Cast-in-Place Concrete Anchors
Williams Form Engineering can supply a wide range of cast-in-place concrete anchor systems. Ranging from J-Bolts, and L-Bolts to a special post-tensionable anchor system that Williams has used on several high profile projects. Anchor design criteria for cast-in-place anchors can be found in ACI 318.
Cast-in-Place Post-Tensionable System
The system shown below allows the engineer to design an anchor system that can be cast-in-place and after the concrete sets, the anchor can be prestressed. The bond breaker provides a free stress length commonly used in post-tensioning systems. The free stress length helps to prevent load loss and concrete spalling that can eventually lead to corrosion problems or fatigue failure. After the anchor is prestressed, the inside of the sleeve can be grouted or it can be pre-greased with a corrosion inhibiting product prior to anchor placement.
Stress Gradient Pigtail Anchor
Williams patented Stress Gradient Pigtail Anchor has a unique design, which gradually increases the depth of each crimp to develop a full length Pigtail anchor. The lesser crimps in front allow the Pigtail to elongate through the concrete thereby transferring stress over its entire length. The stress gradient anchor is a positive “non-slip” anchor, which may be placed within 3” of an edge even in low compression strength concrete.
Williams high tensile steel Pigtail anchors offer more strength per pound than mild steel. A 1/2” high tensile bar will do the work of a 5/8” mild steel bar. Always remember the anchors should be set during pour and no later than one hour after completion of the pour. Work concrete well around Pigtail when placing.
Pigtail Anchor Advantages
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Maximum embedment of the Pigtail Anchor is achieved
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The stress gradient crimp pattern deforms the steel for excellent bonding strength
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The high tensile steel offers high working loads with no welds which can limit strength.
Stress Gradient Pigtail Anchor · Column Anchors · J-Bolts
ASTM A108 Grade C1045
| Diameter and Pitch |
Ultimate Strength (fu) |
Yield Strength (fy) |
Safe Working Load (2:1 SF) |
Standard Pigtail |
Radiused Pigtail | ||
|---|---|---|---|---|---|---|---|
| Length | A Radius |
B Length |
C Total Length |
||||
| 3/8” – 16 (9.5 mm) |
9.3 kips (41.4 kN) |
7.1 kips (32 kN) |
4.6 kips (20.5 kN) |
12” (305 mm) |
4” (102 mm) |
10” (254 mm) |
22” (559 mm) |
| 1/2” – 13 (13 mm) |
17 kips (75.6 kN) |
13 kips (58 kN) |
8.53 kips (37.9 kN) |
18” (457 mm) |
4” (102 mm) |
10” (254 mm) |
24” (610 mm) |
| 5/8” – 11 (16 mm) |
27 kips (121 kN) |
21 kips (93 kN) |
13.6 kips (60.3 kN) |
24” (610 mm) |
6” (152 mm) |
12” (305 mm) |
30” (762 mm) |
| 3/4” – 10 (19 mm) |
40 kips (178 kN) |
31 kips (137 kN) |
20.1 kips (89.2 kN) |
24” (610 mm) |
6” (152 mm) |
12” (305 mm) |
30” (762 mm) |
| 7/8” – 9 (22 mm) |
55.4 kips (246 kN) |
43 kips (189 kN) |
27.7 kips (123 kN) |
30” (762 mm) |
8” (203 mm) |
14” (356 mm) |
36” (914 mm) |
| 1” – 8 (25 mm) |
72.7 kips (323 kN) |
56 kips (248 kN) |
36.4 kips (162 kN) |
36” (914 mm) |
8” (203 mm) |
14” (356 mm) |
42” (1067 mm) |
| 1-1/8” – 7 (29 mm) |
80.1 kips (356 kN) |
62 kips (275 kN) |
40.5 kips (180 kN) |
36” (914 mm) |
N.A. | N.A. | N.A. |
| 1-1/4” – 7 (32 mm) |
102 kips (453 kN) |
79 kips (349 kN) |
51 kips (254 kN) |
42” (1067 mm) |
N.A. | N.A. | N.A. |
| 1-3/8″ – 8 (35 mm) |
129 kips (576 kN) |
100 kips (443 kN) |
64.5 kips (288 kN) |
46″ (1168 mm) |
N.A. | N.A. | N.A. |
| 1-1/2″ – 6 (38 mm) |
148 kips (656 kN) |
114 kips (506 kN) |
124 kips (328 kN) |
50″ (1321 mm) |
N.A. | N.A. | N.A. |
| 2” – 6 (51 mm) |
279 kips (1313 kN) |
215 kips (955 kN) |
139 kips (657 kN) |
72” (1829 mm) |
N.A. | N.A. | N.A. |
Anchor data reflects results from in house testing and the cast-in-place anchors do not conform to the code requirement of ACI 318. Pigtail lengths shown are recommended for 3000 PSI concrete or better.
B3Z Column Anchor
Williams B3Z Column Anchor was designed for use in most general construction, specifically machine, column or utility pole anchoring. The two-piece feature gives this anchor the ability to be placed flush with the concrete, therefore, eliminating interference during concrete placement and finishing. The anchor stud can then be conveniently threaded into the replaced anchor assembly as needed. Williams Column Anchor studs and bars are fabricated from steel with a high tensile strength. Couplings are designed to exceed bar strengths. Anchors are available in most diameters. Plastic caps are provided to protect the threads during concrete pouring.
B4S J-Bolts
Round or square bottom J-bolts with most length and radius combinations available for a wide range of applications. Available in most diameters with coil or V-thread. To order, please specify diameter, A and B dimensions, thread type and length.
B3S L-Bolts
Made with ASTM A615 Rebar, L-Bolts may be used as embedded anchor bolts. Available in most diameters with coil or V-thread. To order, please specify diameter, A and B dimensions, thread type and length.
