Airfield Blast Shield

br /> fence shall be capable of withstanding the afterburner throttle at 30,000 lbs thrust of a B1-B Bomber engine nozzle<br /> 90 ft/ (min.) from front of deflector foundation. Extrapolated temperature is approx. 1400 ℉ velocity @ 900 MPH.<br /> 2.1.2 Haul Route: Approved haul route is from the Tye Gate, Third Street, Ave E, Second Street, to Flightline. Haul<br /> Route subject to change based on Flightline Restrictions. Contractors are required to use the Tye Gate for all access.<br /> 2.1.3 Construction Storage Yard &amp; Contractor Limits: Contractor shall store all equipment and material within the<br /> designed laydown yard. Contractors shall restore this area to pre-construction conditions. Regardless of the area,<br /> the yard shall be fenced. Contractor shall keep the fence well maintained and the site clean and mowed. Contractor<br /> shall obtain approval for any project limits changes prior to construction commencement from 7 CES through the<br /> Contracting Officer. The approved laydown yard will be provided at the pre-construction meeting.<br /> 2.1.4 Contractor shall provide material submittals for all materials &amp; products used in the project on an AF Form<br /> 3000. All PDFs shall be from original electronic documents; no scans allowed due to file size.<br /> 2.1.5 Work is located in a restricted area. The contractor shall submit a two-week schedule to the Escort POC at least<br /> one week prior to work starting to ensure escorts are assigned. The schedule should include start/end times for each<br /> day, crew sizes, and work locations.</p> <p>3.1 BLAST DEFLECTOR CONTRUCTION:</p> <p>3.1.1 Structural frames which support the deflecting surface will be of structural shapes, rolled, punches, and<br /> prefabricated for bolting together at site. Deflecting surface will be of galvanized corrugated steel with a minimum<br /> of 2 oz. zinc coating per Fed. Spec. WW-P-00405. Sheets shall have a section modulus of not less than 0.0163 inches<br /> curbed per inch and shall be of corrosion resistant material with yield point in 50,000 psi range.<br /> 3.1.2 All bolts subject to blast temperatures shall be of SAE 1038 steel, heat treated. All nuts, except on anchor bolts,<br /> shall be made of all-steel, self-locking type.</p> <p>4.1 BLAST DEFLECTOR ANCHORAGE</p> <p>4.1.1 Blast Deflectors shall be installed on existing concrete. Existing concrete has a minimum thickness of 16&rdquo;.<br /> Lynnco &quot;Epoxy-Locked&quot; anchors, with Lynnco No. 22 Epoxy Resin were used to lock in place the existing blast<br /> deflectors.</p> <p>5.1 BLAST DEFLECTOR ASSEMBLY:</p> <p>5.1.1 All components will be assembled by bolting together with flat washers, under heads and nuts. Welding, brazing<br /> or burning of holes is not permitted. All nuts and bolts will be tightened to torques specified by manufacturer.</p> <p>6.1 BLAST DEFLECTOR FINISH:</p> <p>6.1.1 All bolts, nuts and washers will be cadmium or zinc plated. All structural<br /> members, parts, and corrugated metal<br /> will be hot dip galvanized with a minimum coating of 2.0 oz. zinc per square foot of surface. Painting of galvanized<br /> surfaces is not required, but any galvanized surface badly scratched or marred, will be re-galvanized or otherwise<br /> repaired to the satisfaction of the Contracting Officer.<br /> 6.1.2 Contractor shall paint the corresponding aircraft parking position number on the front of the blast deflectors.<br /> The Contactor shall provide a 2&rsquo;x2&rsquo; number sign mounted 15&rsquo; above the concrete at the midpoint on the backside of<br /> the blast deflector. Markings/sign shall follow details 2 and 8 on sheet C2 of the attached drawings.</p> <p>7.1 BLAST DEFLECTOR ALTERNATIVES:</p> <p>7.1.1 At the option of the Contracting Officer, and as specified in Paragraph 2, the Contractor may substitute an<br /> alternate type of blast deflector, providing that the following information and data is submitted, prior to the time of<br /> bid opening and approved in writing.<br /> 7.1.2 Contractor will submit for approval a tabulation of results of full-scale instrumented field tests witnessed and<br /> certified by an accredited testing laboratory, in which proposed alternate is subject to the intermediate throttle power<br /> of similar engines totaling # 30,000 afterburner thrust @ approx. 90 feet distance from the leading edge of the<br /> deflector measured along centerline of bast impingement. Tabulation must show the maximum pressure in psi,<br /> temperature in degrees F., vibration frequency in CPS, and vibration amplitude in inches, taken at the centerline of<br /> blast impingement on deflector. The results of all such readings may not be greater than the readings submitted for<br /> the specified deflector, for each corresponding item.<br /> 7.1.3 Contractor must submit results of smoke-pot tests behind similar deflectors, demonstrating that smoke and<br /> gases are deflected in a vertical direction, with no evidence of smoke dispersal behind deflectors.<br /> 7.1.4 Contractor must submit evidence of satisfactory operation for at least two (2) years in actual field service for<br /> continued testing of similar aircraft and jet engines.<br /> 7.1.5 Contractor must submit detailed design analysis, showing loads and stresses in structural members, deflecting<br /> surface and bolted joints, using the maximum pressure measured in Paragraph 7.1.2, as the average pressure for load<br /> calculations. Welds subjected to tension or vibration may not be used; all bolts must be heat treated if subjected to<br /> blast temperatures.<br /> 7.1.6 Because of thermal shock and cavitation effects, which results in cracking and spalling, concrete deflectors<br /> may not be used as an alternate. Perforated deflecting surfaces are not acceptable for this use.</p>