It might have been prudent to re position the base after the discovery of the
drain pipe. That not being practical now, I would pour the base over the drain
pipe and then after the concrete cure, excavate to the drain and cut out the
section through the base, leaving it in the concrete and route a new pipe
around the base. In this way you would not mess up the base excavation and the
soil around the drain repair could be properly compacted with a jitterbug
tamper, with no negative effect on the base.
JIM
________________________________
From: Patrick Greenlee <patrick_g@windstream.net>
To: n8de@thepoint.net; Marsh Stewart <marsh@ka5m.net>
Cc: towertalk@contesting.com
Sent: Wednesday, January 15, 2014 11:31 AM
Subject: Re: [TowerTalk] Drain Pipe Passing Thru Tower Foundation
You need more room for movement. It would only take a little initial
settling to crack the pvc. Don't rely on just some tape or thin foam.
You don't want to live to regret not giving a little wiggle room.
I am currently getting ready to pull a few 3/4 inch drip tubing runs through
some 4 inch pvc used as conduit. This is to carry some cables, coax, etc.
Why sleeve the conduit? Because insufficient care was taken in the back
fill and it leaks and pools water at the low point. Luckily there is a
satisfactory and inexpensive workaround. On the positive side of luck,
another pair of runs, each 282 feet are just fine.
Patrick NJ5G
-----Original Message-----
From: n8de@thepoint.net
Sent: Wednesday, January 15, 2014 10:04 AM
To: Marsh Stewart
Cc: 'Patrick Greenlee' ; towertalk@contesting.com
Subject: Re: [TowerTalk] Drain Pipe Passing Thru Tower Foundation
I agree with a previous post: make certain that the 'rain pipe' has a
bit of space to expand/contract. Layers of tape won't do it!
73
Don
N8DE
Quoting Marsh Stewart <marsh@ka5m.net>:
> Thanks for your reply.
>
> The rain pipe is solid white PVC schedule 40, not perforated. It carries
> rainwater runoff, not sewerage.
>
> I have decided to wrap the pipe with 2 layers of rubber pipe-insulating
> tape
> and then overwrap that with duct tape, and then pour concrete.
>
> Marsh, KA5M
>
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
> Patrick Greenlee
> Sent: Wednesday, January 15, 2014 6:19 AM
> To: Marsh Stewart; towertalk@contesting.com
> Subject: Re: [TowerTalk] Drain Pipe Passing Thru Tower Foundation
>
> Everyone has an opinion but you have neglected to provide some important
> info. Drain pipe: perforated? solid? sewage, water like from downspouts
> or
>
> what? Solid drain pipe with serviceable "fall" that drains to daylight is
> not a problem. Sewer pipe that has worked OK is likely not a problem.
> Perforated drain pipe might be a problem but not with sufficient slope and
> good drainage down slope from your concrete pour. The devil is in the
> details. If it were mine and I would want to pour over it as others
> describe so long as it is not perforated pipe that could supply water to
> the
>
> area.
>
> Patrick NJ5G
>
> -----Original Message-----
> From: Marsh Stewart
> Sent: Tuesday, January 14, 2014 10:52 AM
> To: towertalk@contesting.com
> Subject: [TowerTalk] Drain Pipe Passing Thru Tower Foundation
>
> I'm installing a base foundation for a US Towers HDX-555. The base will be
> 5' X 5' X 7.25' per specs. The rebar will be per specs. Concrete will be
> 4000psi in 28 days. The soil is moist, very firm, and no water is seeping
> into the hole. After excavation began, I found a 6" white PVC drain pipe
> (rainwater run-off drainage, not sewer) that runs across one corner. The
> drain pipe is about 1.5' below grade and runs at about a 30-degree angle
> across one corner. Total length of pipe exposed (in the base foundation)
> is
> about 4'. The rebar "cage" can be built per specs around the pipe. The
> pipe
> can be relocated, but it will require considerable extra digging and the
> soil around the affected corner will no longer be undisturbed.
>
> Should I relocate the drain pipe or pour concrete around it?
>
> Marsh, KA5M
>
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