HomeMy WebLinkAbout1990-06-22 Contractor Letter, Corrective MeasuresTSP/ADG
June 22, 1990
Architecture • Engineering • Interiors • Planning • Desigr-
Energy Consultation • Construction Management • Desgn/Sjild
L-
Mr.
Bert Elliott �N
Windfield Homes 2 6 19W
12300 Wayzata Boulevard
Minnetonka, MN 55343
Re: Edwards Residence
Orono, Minnesota
TSP/ADG Project No. 89777.1
Dear Bert:
The purpose of this letter is to recap the corrective
measures taken to stabilize the rear garage foundation
wall of Lhe Edwards residence.
The foundation wall had bowed out due to unbalanced
earth pressure during construction, before the
structural floor slab was poured. The garage floor
consists of a 611 to 811 thick reinforced concrete slab
supported on the end walls of the garage and three (3)
intermediate concrete beams poured integrally with the
floor slab. The concrete beams are supported on 1611
square block pilasters reinforced with four (4) #6
vertical bars and filled with concrete. Two (2)
vertical bars at each pilaster bend into the concrete
beam, tying the beam and pilaster together.
To correct the rear wall displacement, the interior
fill along the wall was removed to a depth of about
6'-011. An attempt to push the wall back into place was
made. During this straightening procedure, the upper
four (4) courses of block separated from the lower
wall. The lower twelve (12) courses of block were
about 211 out of plumb. The top of the ?1y ster is at
the same elevation as the 211 displacement.
The purpose of the corrective measures outlined in my
letter of June 18, 1.990, was to tie the upper four (4)
courses of block into the lower portion of the wall.
The bars also tie the block wall into the structural
slab.
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TSP/ADG
The structural floor slab has now been poured. The
concrete beams, which spans across the garage, tie the
pilasters together at the top. The pilasters also
resist the bending due to the d `ferential soil
pressure against the wall. The rear wall is actually
four (4) wall segments placed between pilasters or end
walls. The lower twelve (12) courses of the block wal'_
segments remained integral with the pilasters and the
footing which was placed on engineered fill. The lower
wall segments are, therefore, stabilized at the bottom
at the footing, along the sides at the pilasters, and
are tied to the top portion of the wall with
reinforcing bars grouted in place.
The top courses of block are tied into the floor slab
by these reinforcing bars. The floor slab extends on
to the concrete block walls about 8". This provides a
connection which is semi-rigid.
After my further review of the situation, I am
reassured that the procedures which I outlined are
adequate to stabilize the wall.
If you have any further questions, please feel free to
ca'.1.
TSP/ADG
JKL/LS9777A
P. E.
Engineer
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