Dexpan also specifies a method for cracking concrete even when there is no to
little room for expansion.
It just means drilling more holes. But since each hole has to be 80-90% of the
depth, not sure how much fun it will be drilling perhaps 20 holes 4.5 feet deep
into concrete.
Doable, but not a lot of fun.
Lots of merit to the idea of merely expanding the existing base.
73, Kelly
ve4xt
Sent from my iPhone
>> On Jan 18, 2014, at 22:24, "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
>> wrote:
>>
>>> On 1/18/2014 6:11 PM, Richard (Rick) Karlquist wrote:
>>> On 1/18/2014 2:49 AM, Mike VE3YF wrote:
>>>
>>> A wealth of information here. I will be contacting Dexpan on Monday and
>>> will order 2 boxes of their product. I will still use the hired help to
>>
>> The vendor says the concrete must have room to expand.
>> This sounds exactly like what you don't have with a
>> tower base poured in undisturbed earth. Your concrete
>> has no rebar, but in the general case with rebar, this
>> magic stuff would certainly help, but it is unclear
>> how you would get the broken pieces (still attached by
>> rebar) out of the hole. Even without rebar, I don't
>> see how you get a hold of the pieces to lift them out.
>> Good luck.
>
> Old style post hole digger for smaller pieces. I assume there are long
> handled "grippers" similar to the tongs blacksmiths use. Lots of ways to
> remove the stuff. I've seen large ones that grip with the pull that could
> pull thousands of pounds. I have no idea as to what might be available in
> your area.
>
> BTW where the suction is concerned in pulling out of moist soil. I had a post
> supporting a 12' dish set in maybe 10 or 12 bags of quickcrete. IIRC that is
> well less than a yard. We used a pair of 4000# engine hoists on opposite
> sides, with each set on a pair of 4 X 4s to lift it out. We reached the
> point of a substantial bend in the arms and the concrete had not moved. I
> took a garden hose and used it to drill down along side of the concrete on 4
> sides. I was near the bottom of the concrete on the 4th side when it started
> to move with a very loud sucking sound as the engine hoist arms straightened.
> It was an easy lift after that. The suction with the much larger base would
> probable exceed the weight of the concrete substantially, but by how much
> depends on the soil composition and moisture content.
>
> As a side note, undisturbed soil is firm, but not solid. It can stand a
> surprising amount of expansion.
>
> 73
>
> Roger (K8RI)
>> Rick N6RK
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
> ---
> This email is free from viruses and malware because avast! Antivirus
> protection is active.
> http://www.avast.com
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|