THREADBAR® Reinforcing System
Components of the THREADBAR® Reinforcing System are manufactured in the United States and Canada exclusively by DYWIDAG-Systems International.
THREADBAR® Reinforcing Steel is available in Grades 75 and 100 for sizes #6 through #11, Grade 80 and 100 for #14 through #20, and Grade 75 for #24 and #28 bar. Grade 75, 80 and 100 conform to the requirements of ASTM A615, except in markings. THREADBAR® may be shipped to the job in lengths up to 60-foot or fabricated to specifications.
THREADBAR® Reinforcing Steel has a continuous rolled-in pattern of thread-like deformations along its entire length. More durable than machined threads, the deformations allow nuts and couplers to thread onto a THREADBAR® at any point along its length.
The THREADBAR® reinforcing system offers a simple, reliable and economical splice. A DYWIDAG Splice requires less labor time for assembly than is required for welded or swaged splices.
Unlike some splices, the DYWIDAG Splice may be installed in adverse weather conditions and does not create a fire hazard. As opposing THREADBAR® need only to be chalk marked before assembly to assure proper engagement, supervision and quality control requirements are minimized.
When opposing THREADBAR® are torqued together, the DYWIDAG Coupler may be used without nuts. Using couplers described in the tables below, the splice will develop the full ultimate load of the bar in tension and compression.
Coupler with Hex Nuts
When opposing THREADBAR® are not torqued together, hex nuts may be used on each end of the coupler, and tightened against the coupler. Using hex nuts described in the table below, the splice will develop the full ultimate load of the bar in tension and compression. DYWIDAG Couplers and hex nuts develop the full ultimate load of the THREADBAR®. Slippage of the coupler under stress is controlled by torqueing opposing THREADBAR® together or by using lock nuts. The magnitude of the torque required varies with the allowable slip and THREADBAR® size.
Coupler with Lock Nuts
Lock nuts may also be used with the DYWIDAG Coupler when opposing THREADBAR® are not torqued together. Using lock nuts described in the table below, the splice will develop the full ultimate load of the bar in tension and approximately 50 % of the ultimate load of the bar in compression.
Nuts and Couplers, which develop 125 % of the yield stress of the bar, are available on special order.
Properly sawed or sheared, THREADBAR® do not require end preparation except where the coupler is utilized without nuts as compression splice. Transition couplers for splicing two THREADBAR® of different sizes are also available on special order.
THREADBAR® may be epoxy-coated in accordance with ASTM A775 or galvanized in accordance to ASTM A123. Threaded accessories for coated bars thread over coating. Contact DSI for hardware dimensions.
Form Saver Splice Inserts
Plastic, nail-on coupler inserts are available in bar sizes #6 thru #9 to facilitate field installation of DYWIDAG Dowel Bar Splices.