STRUCTURAL STEEL OF EDUCATION CENTER
Structural steel shop drawings for education center have been made.
STRUCTURAL STEEL
Test Reports
Bolts, nuts, and washers. Intumescent paint
Supply the certified manufacturer's mill reports which clearly show the applicable mechanical and chemical requirements together with the actual test results for the supplied fasteners.
QUALITY ASSURANCE
Drawing Requirements
Submit fabrication drawings for approval prior to fabrication. Prepare in accordance with CNR UNI 10011 and Law 1086. Drawings shall not be reproductions of contract drawings. Include complete information for the fabrication and erection of the structure's components, including the location, type, and size of bolts, welds, member sizes and lengths, connection details, blocks, copes, and cuts. Use AWS standard welding symbols.
Erection Plan
Submit for record purposes. Indicate the sequence of erection, temporary shoring and bracing, and a detailed sequence of welding, including each welding procedure required.
Welding Procedures and Qualifications
Prior to welding, submit certification for each welder stating the type of welding and positions qualified for, the code and procedure qualified under, date qualified, and the firm and individual certifying the qualification tests. If the qualification date of the welding operator is more than one-year old, the welding operator's qualification certificate shall be accompanied by a current certificate by the welder attesting to the fact that he has been engaged in welding since the date of certification, with no break in welding service greater than 6 months.
SOURCE MANUFACTURERS
Intumescent Paint
The following manufacturers provide intumescent paint that generally comply with these specifications:
STEEL
Structural Steel
Law 1086, CNR UNI 10011, structural steel types Fe 360. All structural steel items shall be galvanized in compliance with UNI EN ISO 1461 norm.
Structural Steel Tubing
UNI EN 10297-1.
Steel Pipe
Steel pipe UNI 8863/A1, hot dip zinc coated UNI EN 10240, standard.
HIGH-STRENGTH BOLTS, NUTS, AND WASHERS
Provide the following unless indicated otherwise.
High-Strength Bolts
UNI 5712, Class 8.8. The high-strength bolt heads and the nuts of the supplied fasteners must be marked with the manufacturer's identification mark, the strength grade and type.
Nuts
UNI 5713, heavy hex style, except nuts under 36 mm diameter bolts may be provided in hex style. UNI 5713, Grade and Style for applicable bolt standard recommended.
Washers
UNI 5714 washers for UNI 5712 bolts.
Foundation Anchorage
Bolts
UNI EN 10083-1+A1, Type Fe 360.
Nuts
UNI 5713, hex style.
Washers
UNI 5714.
STRUCTURAL STEEL ACCESSORIES
Welding Electrodes and Rods
UNI 5132 (and AWS D1.1 for reference only), and IIS.
Nonshrink Grout
Law 595, with no shrinkage. Grout shall be nonmetallic.
SHOP PRIMER
UNI 8403, epoxy-polyamide, green primer, except provide a suitable for slip critical joints. If flash rusting occurs, re-clean the surface prior to application of primer.
FABRICATION
Markings
Prior to erection, members shall be identified by a painted erection mark. Connecting parts assembled in the shop for reaming holes in field connections shall be match marked with scratch and notch marks. Do not locate erection markings on areas to be welded. Do not locate match markings in areas that will decrease member strength or cause stress concentrations. Affix embossed tags to hot-dipped galvanized members.
Shop Primer
Shop prime structural steel, except as modified herein, in accordance with CNR UNI 10011. Do not prime steel surfaces embedded in concrete, galvanized surfaces, surfaces to receive sprayed-on intumescent paint, or surfaces within 13 mm of the toe of the welds prior to welding (except surfaces on which metal decking is to be welded). Slip critical surfaces shall be primed with a suitable coating. Prior to assembly, prime surfaces which will be concealed or inaccessible after assembly.
Do not apply primer in foggy or rainy weather; when the ambient temperature is below 7 degrees C or over 35 degrees C; or when the primer may be exposed to temperatures below 4 degrees C within 48 hours after application, unless approved otherwise by the Contracting Officer.
Cleaning
Blast clean all steel that shall be painted when recommended by the paint manufacturer. Maintain steel surfaces free from rust, dirt, oil, grease, and other contaminants through final assembly.
Primer
Apply primer to a minimum dry film thickness of 0.05 mm except provide a suitable coating for slip critical joints in accordance with the coating manufacturer's recommendations. Repair damaged primed surfaces with an additional coat of primer.
Intumescent Paint
Apply intumescent paint, at completion of the structural steel members assembly. Structure to be painted shall be clean, as indicated by the paint manufacturer. The required number of coats shall be applied in order to achieve the fire resistance of R60 as minimum. Intumescent paint shall be suitable to be applied on galvanized steel.
ERECTION
Provide for drainage in structural steel. After final positioning of steel members, provide full bearing under base plates and bearing plates using nonshrink grout. Place nonshrink grout in accordance with the manufacturer's instructions.
CONNECTIONS
Except as modified in this section, connections not detailed shall be designed in accordance with Law 1086 and CNR UNI 10011. Build connections into existing work. Do not tighten anchor bolts set in concrete with impact torque wrenches. Punch, subpunch and ream, or drill bolt holes. Bolts, nuts, and washers shall be clean of dirt and rust, and lubricated immediately prior to installation.
High-Strength Bolts
UNI 5712 bolts shall be fully tensioned to 70 percent of their minimum tensile strength in accordance with CNR UNI 10011 for grade 8.8. Direct tension indicator tightening, , or installation of alternate design fasteners, shall be the only acceptable tightening methods. Use only direct tension indicator tightening for slip critical connections. Bolts shall be installed in connection holes and initially brought to a snug tight fit. After the initial tightening procedure, bolts shall then be fully tensioned, progressing from the most rigid part of a connection to the free edges.
WELDING
IIS, except use only shielded metal arc welding and low hydrogen electrodes for UNI EN 10083-1+A1 steel. Do not stress relieve UNI EN 10083-1+A1. Provide qualified welders, welding operators, and tackers. Removal of Temporary Welds, Run-Off Plates, and Backing Strips. Removal is not required.
SHOP PRIMER REPAIR
Repair shop primer in accordance with the paint manufacturer's recommendation for surfaces damaged by handling, transporting, cutting, welding, or bolting.
FIELD QUALITY CONTROL
Perform field tests, and provide labor, equipment, and incidentals required for testing. The Contracting Officer shall be notified in writing of defective welds, bolts, nuts, and washers within 7 working days of the date of weld inspection.
Welds
Visual Inspection
IIS. Furnish the services of AWS-certified welding inspectors for fabrication and erection inspection and testing and verification inspections. Welding inspectors shall visually inspect and mark welds, including fillet weld end returns.
High-Strength Bolts
Testing Bolt, Nut, and Washer Assemblies
Test a minimum of 3 bolt, nut, and washer assemblies from each mill certificate batch in a tension measuring device at the job site prior to the beginning of bolting start-up. Demonstrate that the bolts and nuts, when used together, can develop tension not less than the provisions specified in CNR UNI 10011. The bolt tension shall be developed by tightening the nut. A representative of the manufacturer or supplier shall be present to ensure that the fasteners are properly used, and to demonstrate that the fastener assemblies supplied satisfy the specified requirements.
Inspection
Confirm and report to the Contracting Officer that the materials meet the project specification and that they are properly stored. Confirm that the faying surfaces have been properly prepared before the connections are assembled. Observe the specified job site testing and calibration, and confirm that the procedure to be used provides the required tension. Monitor the work to ensure the testing procedures are routinely followed on joints that are specified to be fully tensioned.
Testing
The Government has the option to perform nondestructive tests on 5 percent of the installed bolts to verify compliance with pre-load bolt tension requirements. The nondestructive testing will be done in-place using an ultrasonic measuring device or any other device capable of determining in-place pre-load bolt tension. The test locations shall be selected by the Contracting Officer.
If more than 10 percent of the bolts tested contain defects identified by testing, then all bolts used from the batch from which the tested bolts were taken, shall be tested. Retest new bolts after installation. The Contracting Officer can request the execution of the static test and load test of the steel structures in compliance with the Ministerial Decree dated 9 January 1996.