fyi - an alternate shoring design that Rob Ward is advocating for house addition in west seattle I'm working on.
From: John McDowell [mailto:JohnM@PileKing.com]
Sent: Tuesday, June 28, 2011 7:19 AM
To: croberts@ctengineering.com
Subject: driven wide flange shoring
Sent: Tuesday, June 28, 2011 7:19 AM
To: croberts@ctengineering.com
Subject: driven wide flange shoring
Hi Craig,
Please see attached a general description of the driven wide flange shoring system as well as a few pictures of jobs we have done.
Beams are driven using a hydraulic impact hammer that strikes the pile at about 250-400 blow per minute. For temporary cuts up to 8’ cantilever we oftentimes see W6x25 beams at 2’ centers, but for deeper excavations we recommend a W8x31 or W8x35. Lastly, the maximum length beam we can drive without a splice is 30’.
At the end of the job beams are left in the ground as sacrificial. If necessary beams may be cut off several feet below grade to insure they don’t interfere with future landscaping.
If you have any comments or questions then please do not hesitate to call or write.
Regards,
John McDowell
McDowell
2 comments:
what are the "envelope" parameters of this technique? Can they handle hard soils... say with blow counts of 40+?
Also what about vibrations to adjacent existing buildings?
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