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- W650265337 abstract "Tight quarters at the base of the Golden Gate Bridge call for a special excavator-mounted drill that has a low profile but can still reach depths of up to 80 feet. The Phase 2 retrofit involves enlarging footings and four bent locations to support a temporary bridge support to hold the structure while the permanent bents are replaced, all without closing down the structure to traffic. The location of cast- in-drilled-hole (CIDH) piles for the bent's footings led to the need for the special drill. The CIDH piles will transfer the load on the enlarged footings through the backfill of the previous excavations to bedrock. Compression piles had to be drilled alongside the existing footings with limited overhead clearance under the bridge. The contractor was able to average three 24-in. diameter CIDH piles a day at depths of 30 to 48 ft., including drilling, splicing the cages, placing them and pouring the concrete. Round locking Kelly bars on the drill permitted down pressure to be increased from 10,000 lb. to 30,000 lb. without any need for inserting or removing pins." @default.
- W650265337 created "2016-06-24" @default.
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- W650265337 date "2003-11-01" @default.
- W650265337 modified "2023-09-23" @default.
- W650265337 title "DRILLING INSIDE A MOUTH : TIGHT QUARTERS CALLS FOR LOW-CLEARANCE DRILLING UNIT ON GOLDEN GATE BRIDGE" @default.
- W650265337 hasPublicationYear "2003" @default.
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