Reaction piles for load test pile // may // may not // be used as probe piles. Load test piles: Perform probe pile load tests on minimum number as follows: Piles under 45 cm (18 inches) diameter: Test 5 percent of piles. Piles between 45 and 100 cm (18 and 40 inches): Test 10 percent of piles. Piles over 100 cm (40 inches): Test 25 percent of piles. Conduct load tests according to // ASTM D1143/D1143M // ASTM D3689/D3689M // ASTM D3966/D3966M // standard loading procedure. Do not install additional piles until test pile reports are received and approved by COR. Additional load tests or increase in production pile length may be required if test pile fails load test. INSTALLATION COR will determine production pile length and drilling criteria from probe pile installation, reaction piles, test piles, and pile load tests. Perform installation in orderly sequence. Advance auger at continuous rate that prevents removal of excess soil. Stop advancement after reaching required depth or refusal criteria. Auger Refusal: Rate of auger penetration less than 300 mm (1 foot) per minute of drilling. Provide plug to close hole in bottom of auger while being advanced into ground. Remove plug by grout pressure or with reinforcing bar. Place continuous center reinforcing through hollowstemmed auger before grout placement. Tie top of reinforcing in place after auger removal. Use bar spacers to center reinforcing bars. At start of pumping grout, raise auger from 150 to 300 mm (6 to 12 inches) and after grout pressure builds sufficiently, redrill auger to previously established tip elevation. Maintain minimum 3000 mm (10 feet) of grout on auger flighting above injection point during auger raising. Maintain positive auger rotation throughout grout placement. Coordinate rate of grout injection and rate of auger withdrawal to maintain minimum grout head at all times and positive pressure on gauges. Total grout volume to be minimum 115 percent of theoretical volume for each pile, except, after grout is flowing at ground surface from auger flighting, coordinate grout injection and auger withdrawal rates so there is constant grout flow at
Reaction piles for load test pile // may // may not // be used as probe piles. Load test piles: Perform probe pile load tests on minimum number as follows: Piles under 45 cm (18 inches) diameter: Test 5 percent of piles. Piles between 45 and 100 cm (18 and 40 inches): Test 10 percent of piles. Piles over 100 cm (40 inches): Test 25 percent of piles. Conduct load tests according to // ASTM D1143/D1143M // ASTM D3689/D3689M // ASTM D3966/D3966M // standard loading procedure. Do not install additional piles until test pile reports are received and approved by COR. Additional load tests or increase in production pile length may be required if test pile fails load test. INSTALLATION COR will determine production pile length and drilling criteria from probe pile installation, reaction piles, test piles, and pile load tests. Perform installation in orderly sequence. Advance auger at continuous rate that prevents removal of excess soil. Stop advancement after reaching required depth or refusal criteria. Auger Refusal: Rate of auger penetration less than 300 mm (1 foot) per minute of drilling. Provide plug to close hole in bottom of auger while being advanced into ground. Remove plug by grout pressure or with reinforcing bar. Place continuous center reinforcing through hollowstemmed auger before grout placement. Tie top of reinforcing in place after auger removal. Use bar spacers to center reinforcing bars. At start of pumping grout, raise auger from 150 to 300 mm (6 to 12 inches) and after grout pressure builds sufficiently, redrill auger to previously established tip elevation. Maintain minimum 3000 mm (10 feet) of grout on auger flighting above injection point during auger raising. Maintain positive auger rotation throughout grout placement. Coordinate rate of grout injection and rate of auger withdrawal to maintain minimum grout head at all times and positive pressure on gauges. Total grout volume to be minimum 115 percent of theoretical volume for each pile, except, after grout is flowing at ground surface from auger flighting, coordinate grout injection and auger withdrawal rates so there is constant grout flow at
316316AugerCastGroutPiles.docx