Section 05 17 00, Structural Rod Assemblies

Section includes: stainless steel tension rod assemblies of 3/4-inch rods, threaded clevises, clevis pins and retaining rings, [with] [without] a turnbuckle, [with] [without] conical nuts.

Related requirements:

AISC 370-21, Specification for Structural Stainless Steel Buildings.

AISC 360-16, Specification for Structural Steel Buildings.

ASTM A564/A564M, Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes.

ASME B1.1, Unified Inch Screw Threads.

ISO 9001:2015, Quality Management Systems: Requirements.

Product data: the manufacturer's data for each assembly, with its design strengths and the grip plate interface requirements.

Shop drawings: the manufacturer's assembly drawings, signed and sealed by a professional engineer, for each assembly on the project, showing pin-to-pin length, rod cut lengths, adjustment, thread engagement and parts.

Mill test reports: for each heat of steel in the assemblies, showing the material, its condition and where it was melted.

Quality certificate: the manufacturer's ISO 9001:2015 certificate.

Installation instructions: the manufacturer's.

Manufacturer qualifications: assemblies made under a quality management system certified to ISO 9001:2015, with design strengths shown on drawings signed and sealed by a professional engineer.

Single source: every component of an assembly from one manufacturer. Do not mix components from other sources.

[Domestic manufacture: assemblies machined, assembled and inspected in the United States.]

Deliver assemblies in the manufacturer's packaging, labeled with each assembly's mark and length, with the threads protected.

Store off the ground and under cover, away from carbon steel grinding and welding, which can contaminate the stainless surface.

Handle the assemblies so that rods and threads are not bent, nicked or scratched.

Basis of design: Concentric Tension Systems, 1600 Wallis Ave, Santa Anna, Texas 76878; (325) 400-1274; info@concentrictension.com; www.concentrictension.com. Products: stainless steel tension rod assembly TRA-0750-174-T, with turnbuckle, and TRA-0750-174-NT, without turnbuckle.

Substitutions: [Not permitted.] [As specified in Division 01. A substitute shall have design strengths at least equal to those specified, shown on drawings signed and sealed by a professional engineer, and shall meet the material and dimensional requirements of this section.]

Design strength in static axial tension, determined to AISC 370-21 and shown on drawings signed and sealed by a professional engineer:

Loading: static axial tension only. Bending, prying, eccentric, transverse or side loading is not covered unless a licensed engineer evaluates it. Dynamic, cyclic, fatigue, seismic or impact loads shall be converted to an equivalent static load by the Engineer of Record.

Exposure: dry and damp interiors and normally exposed exteriors. Use in corrosive or otherwise aggressive environments requires a project-specific corrosion evaluation by a qualified licensed professional engineer.

Clevises, clevis pins, rods, turnbuckles and conical nuts: ASTM A564/A564M Type 630 stainless steel (UNS S17400, 17-4 PH), condition H1150, with a minimum yield strength of 105 ksi, a minimum tensile strength of 135 ksi and a minimum elongation of 16 percent.

Retaining rings: 15-5 PH stainless steel external retaining rings for the 7/8-inch pin, two to each pin, supplied with the assembly.

Threadlocker: Loctite 243, or equal approved by the manufacturer.

Rod: 3/4-inch diameter, threaded 3/4-10 UNC-2A, left-hand at one end and right-hand at the other, with wrench flats near each end; cut length 12 inches to 20 feet.

Clevises: one left-hand and one right-hand, threaded 3/4-10 UNC-2B, machined from 2-inch round bar with a 5-degree taper toward the rod, slotted for a 3/4-inch grip plate.

Clevis pins: 7/8-inch diameter, grooved for two retaining rings.

[Turnbuckle: 1-1/4-inch diameter, 8-1/4 inches long, threaded right-hand at one end and left-hand at the other, with 1-inch wrench flats, joining two rods.]

[Conical nuts: tapered nuts threaded onto the rod against each clevis [and each end of the turnbuckle], continuing the clevis's taper; decorative, outside the load path.]

Pin-to-pin length: as shown on the Drawings; from 1 foot 5-5/8 inches to 20 feet 5-5/8 inches without a turnbuckle, and from 2 feet 8-7/8 inches to 40 feet 8-7/8 inches with one.

Length adjustment: 3 inches at the clevises[, plus 6 inches at the turnbuckle].

Thread engagement: at least 1 inch at every threaded joint. The last inch of each rod end is marked so the installer can verify engagement in the field.

Grip plate interface, for plates by others:

Finish: [Stainless steel, as machined.] [Stainless steel, blasted.] [Black powder coat, with the threads masked.]

Machining: every part machined from round bar, concentric with the assembly's axis.

Inspection: parts inspected to the manufacturer's drawings under its quality management system, and the records kept.

Traceability: each part traceable to the mill test report for its heat of steel.

Verify that the grip plates and their supports are installed, aligned with the line of each assembly, and meet the grip plate interface requirements.

Verify that each pin-to-pin distance is within the assembly's adjustment range. Do not proceed until conditions are corrected.

Install assemblies only as shown on the manufacturer's stamped drawings, with the parts listed. No field machining, welding, drilling or heating, and no other pins or mountings, without the manufacturer's review.

Apply threadlocker to the rod threads before assembly. Do not let it obscure the engagement marks.

Thread each rod end into its fitting, pin each clevis to its grip plate, and install both retaining rings on each pin.

Adjust each assembly's length by turning the rod [or the turnbuckle] until the assembly is taut, or to the tension shown on the Drawings, keeping at least 1 inch of engagement at every joint.

[Run each conical nut against its fitting and snug it.]

At every threaded joint, verify that the marked last inch of the rod is out of sight inside the fitting.

Verify that both retaining rings on each pin are fully seated in their grooves.

Protect installed assemblies from weld spatter, grinding sparks and contamination by carbon steel.

Clean stainless steel with mild detergent and water. Do not use carbon steel wool or cleaners containing chlorides.