HomeMy WebLinkAboutMiscellaneous - 150 FLAGSHIP DRIVE 8/9/1996 THE NEEL COMPANY
Engineered Precast Products
August 9, 1996
T®WALLO
RETAINING WALL SYSTEM
DESIGN CALCULATIONS
FOR
RETAINING WALL
No. ANDOVER BUSINESS PARK
Lot #1
N. Andover, MA
OF MasscyG
9
THOMAS C. U,
o NEEL
CIVIL
o. 37663
is
S/ONAL
6520 Deepford Street Springfield, VA 22150 • 703-922-6778 FAX 703-971-6699
T-WALL RETAINING WALL CALCULATIONS
THE NEEL COMPANY
JOB NUMBER : 1072 6520 DEEPFORD ST.
DATE 8/9/96 SPRINGFIELD, VA 22150
BY TCN (703) 922-6778
PROJECT NAME: N.ANDOVER BUSINESS PARK
LOCATION N. Andover, MA
WALL NAME Lot#1
GRADING GEOMETRY WALL GEOMETRY
DISTANCE TO SLOPE(d)= 0 FT HEIGHT(H) = 12.5 FT
FILL SURCHARGE = 0 FT BATTER (a) = 0 DEG
DISTANCE TO BREAK = 0 FT BASE (L) = 8 FT
SLOPE ANGLE(R) = 0.00 DEG
TRAFFIC SURCHARGE = 2 FT
BACKFILL SPECIFICATIONS
SELECT INTERNAL FRICTION 32 DEG Ka = 0.307
WEIGHT (y) = 120 PCF Ko = 0.470
COHESION = 0 (assumed)
RANDOM INTERNAL FRICTION 30 DEG Ka = 0.333
WEIGHT (y) = 120 PCF
COHESION = 0 (assumed)
FOUNDATION INTERNAL FRICTION 30 DEG Kp = 3.00
FRICTION FACTORS MINIMUM SAFETY FACTORS
JOINT MATERIAL TO CONCRETE = 0.59 OVERTURNING 2.0
SELECT FILL TO CONCRETE = 0.50 SLIDING 1.5
RANDOM FILL TO CONCRETE = 0.50 PULLOUT 1.5
FOUNDATION -TAN (�) = 0.58
SHEAR KEY STRENGTH = 2460 Ibs
GLOBAL STABILITY
OVERTURNING
SAFETY FACTOR= SUM MOMENTS RESISTING 2
SUM MOMENTS OVERTURNING
SAFETY FACTOR= 242,606 = 2.52
96,354
SLIDING
SAFETY FACTOR= SUM VERTICAL LOADS"FRICTION FACTORS >_ 1.5
SUM HORIZONTAL LOADS
SAFETY FACTOR= 34,938 = 1.69
20,625
MAXIMUM BEARING PRESSURE
Meyerhof distribution which considers a uniform base pressure
distribution over an effective width of B' = L - 2e
MAXIMUM BEARING PRESSURE= Sv=SUM VERTICAL LOADS/(L-2e)
SUM VERTICAL LOADS= 61,935
e= 1.64 U6 = 1.33
MAXIMUM BEARING PRESSURE= 2,623 psf
FACTORS OF SAFETY AT EACH LEVEL
LEVEL HEIGHT STEM LENGTH OVERTURNING SLIDING PULLOUT
1 2.50 6.00 15.47 5.08 9.68
2 5.00 6.00 5.98 3.12 5.33
3 7.50 6.00 3.25 2.30 4.47
4 10.00 8.00 3.64 2.36 5.15
5 12.50 8.00 2.52 1.69 4.11
LEVEL 5
STEM LENGTH = 8 ft
h = 12.50 ft
EARTH PRESSURE TRAFFIC SURCHARGE
Pa = 3125.00 plf Pt= 1000.00 plf
Feh = 15625.00 lbs. Ft= 5000.00 lbs.
Fev= 0.00 lbs.
FACTOR OF SAFETY - SLIDING CALCULATIONS
SLIDING FORCE= 20625.00 lbs.
RESISTING FORCE FRICTION RESISTING
WEIGHT FACTOR FORCE
SOIL TO SOIL 51335.66 0.58 29638.66
Fev 0.00 0.58 0.00
THROUGH JOINT MATERIAL 10599.00 0.50 5299.50
SHEAR KEY(SHEAR STRENGTH) 0.00 N/A 0.00
EMBEDMENT 0.00 N/A 0.00
TOTAL RESISTING FORCE= 34938.16
SLIDING SAFETY FACTOR= 1.69
FACTOR OF SAFETY - PULLOUT CALCULATIONS
PULLOUT FORCE= 4147.99 lbs.
RESISTING FORCE FRICTION RESISTING
WEIGHT FACTOR FORCE
ON STEM(SOIL TO SOIL IN Aeff) 7689.34 0.62 4804.83
ON STEM (SOIL TO CONCRETE IN Aeff) 13909.93 0.50 6954.97
CONC.UNIT WEIGHT(THROUGH JOINT MATERIAL) 10599.00 0.50 5299.50
SHEAR KEY(SHEAR STRENGTH) 0.00 N/A 0.00
TOTAL RESISTING FORCE= 17059.30
Aeff = 34.04 sf PULLOUT SAFETY FACTOR= 4.11
FACTOR OF SAFETY - OVERTURNING CALCULATIONS
FORCE MOMENT ARM OVERTURNING MOMENT
Feh = 15625.00 4.17 65104.17
Ft= 5000.00 6.25 31250.00
OVERTURNING FORCE= 96354.17
WEIGHT HORIZ.ARM VERT. ARM RESISTING MOMENT
PANEL L1 1837.00 1.59 0.00 2924.50
PANEL L2 1837.00 1.59 0.00 2924.50
PANEL L3 1837.00 1.59 0.00 2924.50
PANEL L4 2094.00 2.31 0.00 4837.14
PANEL L5 2094.00 2.31 0.00 4837.14
SELECT FILL Li 7530.98 3.25 _ 0.00 24475.70
SELECT FILL L2 7530.98 3.25 0.00 24475.70
SELECT FILL L3 7530.98 3.25 0.00 24475.70
SELECT FILL L4 10321.36 4.25 0.00 43865.76
SELECT FILL L5 10321.36 4.25 0.00 43865.76
STEP L2 0.00 6.00 0.00 0.00
STEP L3 0.00 6.00 0.00 0.00
STEP L4 9000.00 7.00 0.00 63000.00
STEP L5 0.00 8.00 0.00 0.00
SURCHARGE 0.00 5.33 0.00 0.00
Fev 0.00 8.00 0.00 0.00
RESISTING FORCE= 242606.41
OVERTURNING SAFETY FACTOR=�2.52
Y
DESIGN
——�Trraaffic Surcharge: q = yh
hr 1 j
WOM
00 . ,
4
00
0000
6 V Ft = yKa hH
H 0000 -- --------
8
00000
e F8= 0.5 yKa H z
00000 H/2
00000 00'° Hi3
,Z
0000 0 0000
R e R tan
L
SAFETY FACTOR AGAINST OVERTURNING
(MOMENTS ABOUT POINT O)
S.F.(0)= E Moments Resisting(Mr) _ v (/2) > 2.0
E Moments Overtu ming (Mo) Fe (%)+ Ft
SAFETY FACTOR AGAINST SLIDING :
S.F. (S)= Horizontal Resisting Forces _ R tan � > 1.5
E Horizontal Driving Forces Fe + Ft
= friction angle of foundation tan =coefficient of sliding friction
Bearing Pressure, (Y,= R eccentricity e = L - Mr-Mo
L-2e 2 R
2 2 ,
R = Resultant of vertical forces, V Ka = cos cos R -Vos R -cos-cos
R
cos R + cos 2 p -cos 2��
(3 =slope angle above wall
= friction angle of random backfill
Ippolito, Mary
From: Willett, Tim
Sent: Tuesday, December 23, 2008 8:48 AM
To: Ippolito, Mary
Subject: RE: bond release for 400 Willow St.
There are no issues regarding water&sewer.
-----Original Message-----
From: Ippolito, Mary
Sent: Monday, December 22, 2008 9:05 AM
To: Willett,Tim; Willis, Gene
Subject: FW: bond release for 400 Willow St.
Hi Tim and Gene,
Dutton and Garfield want their bond released and closed out. I've attached their letter from Frank C. Monteiro.
Plse. let me know if you have any issues with their bond release.
Best personal regards,
A4ary Ippolito, planning Department
Osgood Landing
Town of North Andover
1600 Osgood Street
Bldg. 20, -Suite 2-36, Planning Department
North Andover, MA 01845
P 978-688-9535
F 978-688-9542
-----Original Message-----
From: ourcopi
Sent: Monday, December 22,2008 9:55 AM
To: Ippolito, Mary
Subject: Message from KMBT_600
«File: SKMBT_60008122209540.pdf>>
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ili � iot stack units without backfilling because it is unlikely TWALL
that the subgrade will support the point load of the stem, Construction Procedures
and the front face of the wall will almost certainly be out
of plumb by the time the backfill is placed.
If you encounter a unit that is out of square it is best to Foundation Preparation:
use the stem as the guide to alignment. Keep in mind
that this is purely an aesthetic problem, not a structural Excavate the area covered by the precast units and select
problem. Do whatever you can to make the wall look granular material to the elevation of the leveling pad.
good despite the bad unit or units.
Compact the subgrade to 95% Standard Proctor.
Quality Control:
F
Y
TWall should never be built without drawings stamped r r
by a Professional Engineer.
The two critical items for inspection in the field are grada-
tion and compaction of the select granular backfill Leveling Pad Construction:
material. If a naturally occuring material is used, it is not
a reasonable assumption that all the material received Excavate, form and pour leveling pad. Remember, for
will match a single gradation test. Therefore, a sampling g layout purposes, the front wall of the unit should be in
schedule should be determined to ensure that the
r � the center of the pad and the distance per unit is five
backfill meets specifications. Otherwise, compaction and _ feet plus 1/4 inch for the vertical joint.
r
gradation should be checked and documented as with
any engineered embankment. Failure to adhere to either Forming is essential since the pad must be struck off
of thesespecifications will result in wall movement. _
level in both the longitudinal and transverse directions to
- a one quarter inch in ten feet tolerance. If the pad is not
.ter
;3 flat, find the highest point and shim all the units on the
rn ' bottom lift to match it. Be sure to place the shims at the
joints so that both units will rest on the same shim.
-
Beginning 216" from the start of the wall, mark the pad
at 5'1/4" increments. These marks indicate where the
stems of the precast units will rest on the subgrade.
�r � t Grade the material at these marks level with the pad to
the full depth of the stems so that the front faces of the
fir./;^
f =s units will be plumb. Note that after a piece has been set
THE HEEL COMPANY v3 r;:, it is much easier to shim the stem up than to excavate it
down; therefore, it is better to below than high in this
Products for Precasters f operation. In the event of a battered wall, the pad and
the material behind it should be graded on the appro-
6520 Deepford Street priate slope.
Springfield, VA 22150
703-922-6778 At steps in the leveling pad, hold the pad on the high
side back 6 to 8 inches from the location of the step so
�``"E� ��p that it does not interfere with the placement of the unit
adjacent to the step on the low side.
MEMBER prestressed corraete mshbite
In areas where the wall steps u and the leveling ad isa �;-°
p p g p ,A Construct the wall in horizontal lifts. Prior to initial backfill
only one or two units wide, precast leveling pads can save ing, cut the filter fabric into strips equal to the height of
considerable time and money. Compaction and grading the wall at each vertical joint. Place these strips across
under the precast leveling pads is extremely important the 1/4" vertical joints between the units at the rear face
because any settlement or tilting will result in an unac = r ., to prevent the migration of backfill material through the
ce table joint pattern or allin of the recast units. h
p � p p g p joint. Throw the excess filter.fabric over the top of the unit
during backfilling and pull it back on the backfill during
setting operations.
Erection of the TWall Precast Units & Backfilling:
Backfill and compact each lift of units completely before
Always begin erection at a fixed point such as a corner starting the subsequent lifts. Backfill and compact the fill
1 or a tie-in to an existing structure. The reason for this pri- in front of the wall as soon as possible. But definitely
ority is that TWalls have a tendency to grow in length in before the wall is four units high.
�- inverse proportion to the amount of care taken to assure
s that the joints are exactly 1/4". If there is no fixed point, , ;£ f Production will be maximized if circumstances will permit
yl r,F..
;" simply start on the lowest lift. simultaneous erection and backfill with one hackhoP. The
_ ~t l backfilling operation taking place while the erection
a �. .
r' � � ���� _ � '�V `� + laborers are aligning, leveling, etc. In order to take
advantage of this otherwise dead time, both materials will
have to be stored within reach of the backhoe. If this
_ seems impossible, remember the backhoe can sit on top
�K 1
of the backfill material.
Begin placement of units by snapping a chalk line on Dump the select, granular backfill material directly on top
the leveling d at the front face of the wall, Set the first
g p of the stems. This will charge both sides equally and pre-
'� M ° lift of units using this line. Adjust the elevation of the rear '� .r.. _tip~� � - vent lateral movement of the unit.
end of the stem to plumb the front face of the unit. Any
shims used to raise the stem should be flat and level, Cork will be placed in the horizontal joints between units
such as a brick or a piece of wood, since other adjust- at the face. The cork acts as a cushion to prevent spall-
ments will require movement of the unit. Always plumb ing of the precast units and as a gasket to prevent leak
J y rrrv' uy',
the unit first. Next, align the unit based on the chalk line age of the backfill material. Position the cork so that it is
on the leveling pad. After alignment, check the top of the k flush with the rear face of the unit. This will prevent
front face for level and height with regard to the other degradation of the cork caused by ultraviolet rays and
units in this lift. If the top of the unit is irregular, place the
maintain contact between the cork and the strip of filter
level on the line where the top of the front face is cham- = fabric to prevent leakage. Every effort should be made to
fered. Shim as necessary. Check alignment, level and . s ensure that the first lift of units is properly aligned and
level, since an shimming other than with full length
plumb to make sure that you have not disturbed one � ��,� - y g g
while adjusting the other pieces of cork tends to undermine the gasket function of
the cork, Cork is not required between the leveling pad
and the precast units.
Shear keys wrapped with 1/4" cork should be placed in
.,
Finally, step back and sight down the tops of the units
u: the space created when the teeth on the top and, bottom
r� This visual check will allow you to fine tune the ��
s �u of two units come together. The number of keys should
" alignment. �; _�b��
be one per six feet of length or fraction thereof, spaced
equally beginning at the rearmost opening in the shorter
unit. The purpose of these keys is to prevent movement
of the unit during backfill operations, consequently any
shimming to plum the front face should be done by
placing additional 1/4" cork on the sloping sides of the
shear key. Placing shims on the top of the shear key or
directly on the stem of the unit itself will prevent the
desired contact between the shear key and the units and
t �
movement will occur.