Thank you all for your reponses to the "tieback question."
At 08:52 PM 4/9/99 -0500, you wrote:
>Brad Friederichs wrote:
>> I'm designing a tieback retaining wall using tierods that are connected
>> from back of wall to tiebacks grouted into rock. The 12 ft wide space
>> between the back of vertical retaining wall and the existing slope will be
>> backfilled once the tierods are in place.
>> The new backfill will be compacted but is being placed on compressible
>> materials that are expected to settle about 1" or so during the life of the
>> project (50 years). The wall itself is supported on rock and is not
>> expected to settle.
>> My question is: When the fill settles behind the wall, the tierods will
>> have vertical load imposed on them from the fill. One of the tierod
>> manufactures states that I don't need to worry about this. I think that
>> the rods will pickup significant tranverse load and possibly fail in
>> combined tension and bending or pullout the anchorage due to increased
>> axial force (from suspending the soil load above).
>> How do you feel about this?
>> Brad Friederichs
>> VE Solutions, Inc.
>> Sacramento, CA
>Wrap the tie rods w/ foam rubber pipe insulation used by plumbers to
>prevent pipe freezing. Soil will both shear around rods and have
>limited downward pressure. Unless you have designed those tie rods to
>develope 99.9% of their strength, shouldn't be a problem at 1 inch