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1. [TowerTalk] Base equivalent (score: 1): Author: Mike Reublin NF4L <nf4l@comcast.net>; Date: Fri, 10 Jan 2014 16:28:11 -0500; The specs for my crank up call for a hole 4x4x7.5 feet. That works out to 4.4 yds of concrete. The smaller backhoes that I can get to the site can go to a depth of 6 feet. Because of the water table,; /archives//html/Towertalk/2014-01/msg00158.html (7,380 bytes)
2. Re: [TowerTalk] Base equivalent (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Fri, 10 Jan 2014 13:49:21 -0800; A hole 5x5x6 is 5.5 yds. Would that be a safe equivalent to hold the tower up with the same wind load? You really need to look at the analysis for the original design: what bearing strength for the s; /archives//html/Towertalk/2014-01/msg00159.html (9,380 bytes)
3. Re: [TowerTalk] Base equivalent (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Fri, 10 Jan 2014 13:59:54 -0800; A hole 5x5x6 is 5.5 yds. Would that be a safe equivalent to hold the tower up with the same wind load? I just thought of a better analogy than my straw in a milkshake one.. For a freestanding tower,; /archives//html/Towertalk/2014-01/msg00160.html (8,344 bytes)
4. Re: [TowerTalk] Base equivalent (score: 1): Author: J Chaloupka <boltsnutspins@yahoo.com>; Date: Fri, 10 Jan 2014 14:25:51 -0800 (PST); If it were my dilema, I would go back to the tower manufacturer and tell them my situation. Ask for a modified and certified specification for the specific instalation. JIM I just thought of a bett; /archives//html/Towertalk/2014-01/msg00161.html (8,929 bytes)
5. Re: [TowerTalk] Base equivalent (score: 1): Author: Brian Amos <bamos1@gmail.com>; Date: Fri, 10 Jan 2014 16:05:25 -0700; As a foundation engineer my first thought is wow! I think that foundation is way over designed. My second thought is if you have water at 5 feet you may be better off having the backhoe guy bring a d; /archives//html/Towertalk/2014-01/msg00162.html (11,656 bytes)
6. Re: [TowerTalk] Base equivalent (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Fri, 10 Jan 2014 15:21:30 -0800; On 1/10/14 3:05 PM, Brian Amos wrote: As a foundation engineer my first thought is wow! I think that foundation is way over designed. My second thought is if you have water at 5 feet you may be bette; /archives//html/Towertalk/2014-01/msg00163.html (9,412 bytes)
7. Re: [TowerTalk] Base equivalent (score: 1): Author: john@kk9a.com; Date: Sat, 11 Jan 2014 08:40:20 -0500; Would a hole 8 x 8 x 3 (5.3 yards) be a safe equivalent? I doubt that anyone on towertalk could answer your question without studying the soil conditions and the unmentioned tower that goes on it. It; /archives//html/Towertalk/2014-01/msg00165.html (8,134 bytes)
8. Re: [TowerTalk] Base equivalent (score: 1): Author: Brian Amos <bamos1@gmail.com>; Date: Sat, 11 Jan 2014 07:50:42 -0700; To go that thin I would recommend using a number 6 or larger rebar on the top and bottom. At that point you might be better off calling a local concrete company to put the foundation in for you. They; /archives//html/Towertalk/2014-01/msg00166.html (13,095 bytes)
9. Re: [TowerTalk] Base equivalent (score: 1): Author: "Patrick Greenlee" <patrick_g@windstream.net>; Date: Sat, 11 Jan 2014 09:04:26 -0600; Brian, faced with a similar problem and using brute force and awkwardness as a substitute for engineering training, I elected to excavate 4 trenches radiating from the central excavation. I then put; /archives//html/Towertalk/2014-01/msg00168.html (13,613 bytes)
10. Re: [TowerTalk] Base equivalent (score: 1): Author: "Mark Robinson" <markrob@mindspring.com>; Date: Sat, 11 Jan 2014 21:53:48 -0500; A ham in Florida (which has a high water table) just had a big hole dug for his tower. The company used what is called a well point. It is defined here http://dictionary.reference.com/browse/well-poi; /archives//html/Towertalk/2014-01/msg00180.html (10,162 bytes)
11. Re: [TowerTalk] Base equivalent (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Sat, 11 Jan 2014 19:54:45 -0800; http://dictionary.reference.com/browse/well-point Another strategy used on large excavations is to pump liquid nitrogen into the soil and create a frozen barrier to water infiltration. ______________; /archives//html/Towertalk/2014-01/msg00181.html (8,576 bytes)
12. Re: [TowerTalk] Base equivalent (score: 1): Author: Mickey Baker <n4mb@arrl.net>; Date: Sun, 12 Jan 2014 01:20:01 -0500; Hi, Jim, and all, My QTH is surrounded by water - I'm on an island about 350' wide made mostly of dredged muck. To keep the tower base hole dry here in my Florida QTH, I used a relatively small pump; /archives//html/Towertalk/2014-01/msg00182.html (10,658 bytes)
13. Re: [TowerTalk] Base equivalent (score: 1): Author: Brian Amos <bamos1@gmail.com>; Date: Sat, 11 Jan 2014 23:30:26 -0700; Patrick That sounds like quite the interesting setup. How well it works really depends on the soil conditions and the design loads. Having a reinforced foundation goes a long way. In this case the ex; /archives//html/Towertalk/2014-01/msg00183.html (15,822 bytes)
14. Re: [TowerTalk] Base equivalent (score: 1): Author: Mike Reublin NF4L <nf4l@comcast.net>; Date: Sun, 12 Jan 2014 06:01:40 -0500; Thanks all for your comments and suggestions. I'm going to contact an engineer Monday. The fee will be a bargain for peace of mind. 73, Mike NF4L _______________________________________________ _____; /archives//html/Towertalk/2014-01/msg00185.html (9,230 bytes)

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