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Total 25 documents matching your query.

1. [Towertalk] Rebar Cage (score: 1): Author: va3pl@cuic.ca (Andrew Pfeiffer); Date: Thu, 19 Sep 2002 12:36:42 -0400; I become happy owner of TX455 crank up tower. I began planning the rebar cage. My questions is: Can vertical rebar members be driven let say 2 feet deep to the ground at the bottom of the hole or thi; /archives//html/Towertalk/2002-09/msg00656.html (7,426 bytes)
2. [Towertalk] Rebar Cage (score: 1): Author: FireBrick" <w9ol@billnjudy.com (FireBrick); Date: Thu, 19 Sep 2002 12:10:06 -0500; As a retired mason contractor, I can see where you are going. You want the verticals stable so you can easily wire the horizontals on while in the hold. Ideally, rebar should not extend through the c; /archives//html/Towertalk/2002-09/msg00657.html (9,590 bytes)
3. [Towertalk] Rebar Cage (score: 1): Author: RedHaines@centurytel.net (Red); Date: Thu, 19 Sep 2002 14:49:35 -0500; It is better if rebar members are totally contained in the concrete, to eliminate paths where the natural alkilinity of the concrete may leach out, particularly at the bottom of the assembly. That al; /archives//html/Towertalk/2002-09/msg00667.html (9,500 bytes)
4. [Towertalk] Rebar Cage (score: 1): Author: RedHaines@centurytel.net (Red); Date: Thu, 19 Sep 2002 14:55:34 -0500; In addition, welding all joints helps the rebar distribute lightning discharges through the concrete, making your base a "Ufer" ground, named after the investigator who established its value. The wel; /archives//html/Towertalk/2002-09/msg00670.html (11,263 bytes)
5. [Towertalk] Rebar Cage (score: 1): Author: jerry@plemmons.net (Jerry Plemmons); Date: Thu, 19 Sep 2002 16:21:11 -0400; I can recall a commercial tower design firm (1,000 and 2,000 foot broadcast towers) telling me that you never run a ground cable through a concrete base or guy anchor. That the rebar cage is intended; /archives//html/Towertalk/2002-09/msg00671.html (12,646 bytes)
6. [Towertalk] Rebar Cage (score: 1): Author: bobharrison@shaw.ca (Bob Harrison); Date: Thu, 19 Sep 2002 14:56:48 -0600; I agree Jerry, the lightning strike would super-heat the moisture in the concrete causing it to shatter the base. Bob, VE6BRH --Original Message-- From: towertalk-admin@contesting.com [mailto:towerta; /archives//html/Towertalk/2002-09/msg00674.html (13,752 bytes)
7. [Towertalk] Rebar Cage (score: 1): Author: kr7x@attbi.com (kr7x@attbi.com); Date: Thu, 19 Sep 2002 21:31:17 +0000; Hold on now..... Do not weld the rebar... unless it is ASTM A706 grade or you preheat the bars to 300 degrees F for #6 and smaller and 500 degrees F for #7 and larger. This is from the ANSI/AWS D1.4-; /archives//html/Towertalk/2002-09/msg00675.html (13,918 bytes)
8. [Towertalk] Rebar Cage (score: 1): Author: kr7x@attbi.com (kr7x@attbi.com); Date: Thu, 19 Sep 2002 21:35:56 +0000; Jerry: This is an old wive's tale. The use of the foundation reinforcing as part of the ground is called a "Ufer ground" after the guy who first devised the concept. It is a very common way to ground; /archives//html/Towertalk/2002-09/msg00676.html (14,942 bytes)
9. [Towertalk] Rebar Cage (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Thu, 19 Sep 2002 17:45:44 -0400; Noooo.... not again! If this is the case, why does Polyphaser bless the use of a Ufer ground? The exploding base thing is an urban legend, as far as I can tell. 73, Pete N4ZR Sometimes a tower is jus; /archives//html/Towertalk/2002-09/msg00677.html (8,300 bytes)
10. [Towertalk] Rebar Cage (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Thu, 19 Sep 2002 15:17:02 -0700; It's also possible that an asteroid will strike Earth on the opposite side of the planet, directly 180 degrees opposed to your tower base, and knock your tower and base clear out of the dirt, toward; /archives//html/Towertalk/2002-09/msg00680.html (9,111 bytes)
11. [Towertalk] Rebar Cage (score: 1): Author: billwall@eyecon-solutions.com (Bill Wall); Date: Thu, 19 Sep 2002 18:36:57 -0400; Hi all; The tower guy is correct. I have seen this for myself. Bill Wall KC4UZ -- Original Message -- From: "Jerry Plemmons" <jerry@plemmons.net> To: "Red" <RedHaines@centurytel.net>; "FireBrick" <w9; /archives//html/Towertalk/2002-09/msg00683.html (15,045 bytes)
12. [Towertalk] Rebar Cage (score: 1): Author: sparks@apk.net (Jeff Brown); Date: Thu, 19 Sep 2002 18:42:15 -0400; A related article is: http://www.polyphaser.com/datasheets/PTD1030.pdf Jeff WB2RUZ To: <towertalk@contesting.com>; /archives//html/Towertalk/2002-09/msg00684.html (8,496 bytes)
13. [Towertalk] Rebar Cage (score: 1): Author: k2av@contesting.com (Guy Olinger, K2AV); Date: Thu, 19 Sep 2002 20:53:35 -0400; You want the rebar completely enclosed by concrete. There should be four inches of concrete between any rebar and the outside. They make little concrete blocks to support and stand off the rebar, esp; /archives//html/Towertalk/2002-09/msg00702.html (9,668 bytes)
14. [Towertalk] Rebar Cage (score: 1): Author: jfarr62@comcast.net (John D. Farr); Date: Thu, 19 Sep 2002 21:46:52 -0500; This is specified in the "Building Code for Requirements for Structural Concrete (ACI 318-95)." The entire paragraph reads: 3.5.2 -- Welding of reinforcing bars shal conform to "Structural Welding C; /archives//html/Towertalk/2002-09/msg00712.html (10,370 bytes)
15. [Towertalk] Rebar Cage (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Fri, 20 Sep 2002 06:54:27 -0400; Interesting, since the Polyphaser tech note just cited by another poster specifically advocates using "an exothermic method" to bond the rebar joints in a Ufer ground, to avoid the potential of spark; /archives//html/Towertalk/2002-09/msg00717.html (8,829 bytes)
16. [Towertalk] Rebar Cage (score: 1): Author: jerry@plemmons.net (Jerry Plemmons); Date: Fri, 20 Sep 2002 09:09:01 -0400; The document recommends Ufer only as an augmentation to a properly designed and implemented ground system. And that, yes, a strike, under certain circumstances, can cause the foundation to crack. I t; /archives//html/Towertalk/2002-09/msg00719.html (9,709 bytes)
17. [Towertalk] Rebar Cage (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Fri, 20 Sep 2002 09:23:55 -0400; That's awfully selective, Jerry. The article also says, "It is a common misconception to think that a lightning strike will blow up a concrete pad." As for the "certain circumstances," they say, "We; /archives//html/Towertalk/2002-09/msg00723.html (8,607 bytes)
18. [Towertalk] Rebar Cage (score: 1): Author: jerry@plemmons.net (Jerry Plemmons); Date: Fri, 20 Sep 2002 09:55:52 -0400; Thanks, Pete. Several Towertalk readers responded directly detailing other occurrences of concrete cracking after a lightning hit. I don't think anyone in the thread ever used the term "blow up" the; /archives//html/Towertalk/2002-09/msg00726.html (9,687 bytes)
19. [TowerTalk] rebar cage (score: 1): Author: "FireBrick" <w9ol@billnjudy.com>; Date: Sun, 22 Jan 2006 19:20:03 -0600; The cages would normally be built on a set of saw horses. Lay all the long (verticals) next to each other and then we would mark the distances that the horizontals would be placed. Trying to hold a t; /archives//html/Towertalk/2006-01/msg00421.html (7,830 bytes)
20. [TowerTalk] rebar cage (score: 1): Author: Al nsixtez <n6tez@yahoo.com>; Date: Wed, 11 Oct 2006 21:09:35 -0700 (PDT); Hi Scotty, I've seen the method you mentioned- driving a piece of re-bar into the dirt and tying the cage to it, used many times. As an old retired contractor and building inspector, please let me gi; /archives//html/Towertalk/2006-10/msg00350.html (7,730 bytes)

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