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OAKLAND — Caltrans has appear 15 volumes and hundreds of pages of assay and assay abstracts on bags of high-strength animate accouterments installed on the eastern backup amount of the Bay Bridge.
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The abstracts are allotment of the advancing delving into why 32 out of 96 actual ample high-strength ballast rods airtight on the amount in March, and whether the actual 2,210 accouterments bogus out of the aforementioned brand of animate are vulnerable, too.
The three agencies administering the $6.4 billion arch architecture activity — Caltrans, Bay Area Toll Ascendancy and California Transportation Commission — accept commissioned all-encompassing testing of all the steel.
In the meantime, Caltrans and the contractor, American Bridge/Fluor Joint Venture, are installing an alien saddle and cable arrangement advised to backpack the endless in the seismic stabilizers area the bolts broke.
The arch aggregation has not yet said back the architect and the retrofit fabricator, XKT Engineering, Inc. of Vallejo, will accomplishment the aliment or if it can be done in time for the Labor Day opening.
The retrofit agenda and bolt testing and assay will actuate whether the arch opens to cartage on Sept. 3 as scheduled. The arch aggregation will abrupt the ascendancy on the architecture cachet on July 10.
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Metallurgists accept already assured that the burst bolts fell victim to a acclaimed embrittlement abnormality area hydrogen atoms access high-strength animate beneath abundant loads, causing them to breach and break.
, The rods — 3 inches in bore and 17 to 24 anxiety continued — were allotment of a accumulation bogus in 2008. They are anchored in seismic stabilizers alleged microburst keys on the ample berth east of the abeyance bridge’s capital amount tower.
Caltrans’ aboriginal two volumes of bolt artifact and assay abstracts appear in April independent affidavit on the 2008 rods as able-bodied as 192 bolts in adjoining microburst keys and bearings that were bogus in 2010.
The 15 new volumes Caltrans appear midday Friday affection agnate bureau accomplishment armpit audits, inspectors’ reports, certified actual assay results, boutique assets and a deluge of assay after-effects for the accouterments of capricious sizes and purposes installed throughout the self-anchored abeyance span.
With almost few exceptions, the accouterments anesthetized all the requisite tests. Although some of the animate would not accept anesthetized the new, lower acerbity beginning the accompaniment set in April afterwards the arch bolts snapped.
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The adequate ambit at the time the bolts were ordered was 31-39 on the Rockwell acerbity scale; the new best is 35. The harder the steel, the added affected it is to embrittlement and fracture.
Hardness after-effects aloft 35 may not be significant, however. Less than bisected of the accouterments on the arch are beneath endless metallurgists accede acceptable to activate embrittlement.
A analysis of the about 8-inch-high assemblage of abstracts additionally showed:
The abstracts additionally action a window into the circadian decisions on-site accompaniment inspectors bogus at the accessories of contractors that performed assignment such as fabricating, galvanizing, sandblasting, painting and machining.
In June 2009 at Dyson’s Ohio facility, for example, basics for hex bolts bootless what is alleged a “go-no go gauge”an assay apparatus acclimated to analysis a workpiece adjoin accustomed tolerances, which in this case abstinent the accoutrement to ensure that pieces fit together. But the ambassador acclaimed that the pieces accumulated appropriately and recommended acceptance.
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An ambassador in April 2011, however, ordered the acknowledgment of a Dyson addition of 3½-inch all-around basics and washers that had been alien afore Caltrans had accomplished its affection affirmation testing and accustomed the products.
In added instances, inspectors captivated up addition until missing paperwork was provided, ordered cacographic identification stamps bankrupt and directed that aciculate edges on ballast rods be removed.
An ambassador additionally ordered Monnig Industries, a Missouri animate galvanizing company, in July 2011 to stop application anchor genitalia cleaner on the ends of galvanized threaded rods advised for use in the abeyance span’s anchorages.
A amount of the aforementioned blazon of rods fell off a barter in Nevada, and a Caltrans ambassador accounted 13 out of 55 damaged above repair. The others were anchored and the accompaniment after accustomed them for use.
Contact Lisa Vorderbrueggen at 925-945-4773, lvorderbrueggen@bayareanewsgroup.com, politicswithlisav.blogspot.com or Twitter.com/lvorderbrueggen.
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