
If you want a
fence
on top of a wall, there are some things to consider. Is the wall already
built? If it is, then you have to know how the wall was built; did they use
geogrid, or is it a gravity wall? If the wall is in the planning stages, you
have to decide the placement of the fence and how it will affect the
construction of the wall.
There are many ways to build a fence above a wall. One is to
have the fence set 3 feet (.9 meters) behind the back of it. This method is
preferred because it does not require extra engineering. This requires construction
tubes to be placed during the construction of the wall. If the fence is added
after the wall is already built, the fence installer could damage the
structural integrity of the wall. If the wall was built using geogrid, they
could tear it, which will cause the wall to fail. Instead, they will have to
dig the post holes by hand. If the wall is constructed using no-fines concrete,
the fence installer will not be able to install a fence after the wall is
built.
A
second method is to have the fence directly behind the wall. This requires a
fence above the wall overturning calculation to be completed to understand how
the fence interacts with the wall. This calculation determines the fence’s
parameters; how deep do the posts need to be placed? How far apart are the
posts? How tall is the fence? These factors impact the wall, which may cause
the top to overturn and fail. To have the fence directly behind the wall, you
will have to install the construction tubes during the construction just like
the first procedure mentioned. A way to do this is with Sleeve-It. Sleeve- it
is a product that is installed during the wall construction, but it does not
require extra engineering for overturning. If you have any questions regarding
this topic feel free to contact us at 800-899-5309, or email us at engineering@allanblock.com.
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