[Ferro List] FC Sphere leveling

[dl]

The vent?? tangent on top with a cable sounds a good way. The top slips faster than 
the lower soil so it should tend to roll downhill. Mud jacking will float the sphere 
higher. Cable will probably cause the mud to flow around. Saturated mud flows simular to water.
There are often slip strata that slide on frost at first thaw.

Pressure may be as low as 40# to lift a 6 in slab. position under the slab determins the angle of float. 

dl




-----Original Message-----
>From: Janoahsh <janoahsh at alaska.net>
>Sent: Feb 25, 2008 3:26 AM
>To: 'Ferrocement Discussion List' <list at ferrocement.net>
>Subject: Re: [Ferro List] FC Sphere leveling
>
>Thank you,
>Mud Jacking does sound like a good solution.  Do you have any idea what size
>pipe and how much pressure is involved?  I've only heard of it and thought
>it would require greater pressure than PVC would handle.  PVC would
>certainly conform to the shape more easily.
>When you say just below half way to the bottom, do you mean just below the
>1/4 sphere horizontal line?
>Ditching above the structure helps a lot as well.
>janosh
>
>-----Original Message-----
>From: list-bounces at ferrocement.net [mailto:list-bounces at ferrocement.net] On
>Behalf Of dl
>Sent: Sunday, February 24, 2008 8:35 PM
>To: Ferrocement Discussion List
>Subject: Re: [Ferro List] FC Sphere leveling
>
>You would want to jack tangent to the sphere to change the level 
......

>My choice - pipe for mud jacking and use sand with mud or the dirt that is
>already there.
>It will 'float' just like a drive slab or a boat.
>
>dl