M ALCOLM D RILLING C OMPANY I NC . D OWNTOWN S AN F RANCISCO - - PowerPoint PPT Presentation

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M ALCOLM D RILLING C OMPANY I NC . D OWNTOWN S AN F RANCISCO - - PowerPoint PPT Presentation

May 20, 2023 131 likes •655 views

M ALCOLM D RILLING C OMPANY I NC . D OWNTOWN S AN F RANCISCO Transbay Construction 140ft 181 Fremont 125 ft Site preparation Pre Drill to remove existing timber piles Replace Class 1 contaminated soil with engineering fill. 56

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MALCOLM DRILLING COMPANY INC.

DOWNTOWN SAN FRANCISCO

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Transbay Construction

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125 ft 140ft

181 Fremont

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Site preparation

  • Pre Drill to remove

existing timber piles

  • Replace Class 1

contaminated soil with engineering fill.

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9.2’ 3.3’’

  • 56 Each, 95’ deep cutter soil

mix concrete panel

  • Each has one two or three

wide 90’ flange beams

  • Drilling sequence is very

critical due to Primary / Secondary panels

  • Tracking large amount of

data

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  • 80ft long sampling

beam

  • Dip into the freshly

installed concrete panel and collect sample at various elevation

  • Sample then cast into

cylinders and break at 3/7/14/28 days

  • Test for both strength

and permeability

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Continuous water spraying to suppress ill odor Splash protection

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Reference Frame, set to precise location to allow accurate placement

  • f the Wide Flanges

Checking Plumbness

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Wide Flange - Cutting the site in half. Consistently storing 10 – 15 beams on site.

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Spoil Pool – Stored on site for 24 hours before it solidifies and ready to be off hauled.

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Test Pile – 72” diameter, 263.5’ deep, 28’ into rock The actual test - 22 hours continuous monitoring with max load of 9200 kips

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Report of the test shows satisfactory results We now move on to production ! Not so fast… More preparations!

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100ft 120 – 130 ft 20+ ft

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To do the work we need:

  • Bauer BG 46 Rotary Drill Rig
  • Sumitomo 1500 Crawler Crane
  • Leffer 2.5m Casing Oscillator
  • Oscillator Power Pack
  • 120 LF of 6’ diameter double wall casing
  • 270 LF of 5’ diameter rebar cage, 1 per pile
  • Air Compressor
  • 7 each - 20,000 gal Baker Tanks
  • Boom Concrete Pump
  • Excavator and Loader
  • Concrete Trucks
  • Off Haul dump trucks

And we have: 125’ by 140’ … …

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Site Reconfiguration – Disintegrate the scaffold Move all baker tanks to a different location to make access for drilling operation for the remaining piles.

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Pile installation procedure:

  • Set up over a pile and drill the top 5-10’
  • Start twisting casing using oscillator and charge the hole with polymer slurry
  • Continue drilling while adding more casing

(20’ section each time until 100+’ of casing BGS)

  • Continue drilling down to top of rock

(rock verified by Geotechnical engineer on site)

  • Drill 20’ of rock socket
  • Do a complete water exchange to remove all suspended solid
  • Pick / splice / set rebar cages

(260+’ cage came in four 60+’ pieces)

  • Pour concrete
  • Conduct Crosshole Sonic Log on each pile upon completion
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Fresh slurry going into the hole Dirty slurry coming out

  • f the hole
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These are for 1 pile Me, measuring cages

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Color coding the verticals to make sure they can splice properly.

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Remember this guy? That’s our test pile ! Its about 15 mins since you saw it the last time, for us at that time was a year!

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  • Put in lot of effort in pre planning will help you succeed in a

complex job like this

  • Team work is very important. Good communicated between

the members of the team will help the job go smooth

  • Track every detail, adjust accordingly
  • Experience is very important, but for job like this, hardly

anyone will have the experience. Hence, being knowledgeable and able to react quickly to problems is essential.

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