Article Abstract:
The use of an innovative cable-tensioned building system has facilitated the installation of an aircraft hangar roof in the Portland International Airport. STRARCH, developed by Strarch International Ltd, involves construction at ground-level and roof-hoisting to the desired height using prestressed cables and hydraulic jacks. The method lessened the use of scaffolding and cranes and reduced the amount of steel required for the project by 25%. The assembly of roof materials and other installations at ground-level has cut down risks of worker injuries and construction time.
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Article Abstract:
Areas of thin concrete had to be identified and fixed in the new light-rail tunnels in Portland, Ore. The possible cause of the thin concrete may have been the problems associated with pumping concrete into a thin zone next to a previous pour. Ground-penetrating radar (GPR) was used to survey the lining and impact echo (IE) provided a second opinion for questionable areas. Repair and remediation recommendations included breakout and repair with patch pour and fill-void using cement grout.
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Article Abstract:
Engineering consultancy firm O'Kon & Co. designed four innovative aircraft hangars for the US Navy, Air Force and National Guard. The hangars serve as testament to the firm's ability to fit large planes into spaces that are within the area and cost budgets of the Dept. of Defense. This was achieved through a variety of techniques that include reshaping the conventional nose dock, using upward-acting hangar doors and employing classical structural shapes commonly seen in cathedrals.
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