Contech A

S E Q U E N C E O F I N S TA L L AT I O N
BRIDGE
STREAMBANK
A - J A C K S
SCOUR
1
Contour the eroded
bank and prepare for
delivery of A-Jacks. Two
halves of each A-Jacks
arrive onsite in pallets of 36.
A large lift truck or backhoe
with forks is necessary to
unload the pallets and transport
them to the installation site.
2
Streambed material
is excavated out of a
shallow trench at the base
of the eroding bank with
a track hoe.
The base
elevation of the trench should
be below the elevation of the
streambed.
3
A-Jacks are
assembled by sliding
one half into another to
form a complete unit.
Rows of A-Jacks are
assembled to interlock in
horizontal as well as vertical
directions. High embankments
may require as many as three
rows of A-Jacks at the toe.
1
Clear all debris
if present and fill the
existing scoured area with
fill material by using a
trackhoe. A bedding layer of
rock and/or geotextile is
recommended over the
graded surface in preparation
for the A-Jacks matrixes.
2
Pallets of A-Jacks
arrive onsite and are
offloaded by a large lift
truck or backhoe with
forks. Each pallet is lowered
into the streambed (dry
application) and A-Jacks are
then assembled by sliding one
half into the other.
3
A-Jacks are
placed into a series of
predetermined matrixes
specially engineered to
surround each pier on the
lead edge and down both
sides.
Each
A-Jacks
is
uniformly placed in contact
with six adjacent units.
4
4
A small diameter
cable made of high
strength
polyester
or
stainless steel is placed
around each A-Jack matrix,
crimped with an aluminum
sleeve
and
the
excess
trimmed.
Sediment from the
toe trench is placed into
rows of A-Jacks by the
excavator. This fluid mix will
enter the voids. The vertical
streambank is sloped down
over
the
A-Jacks
and
compacted with the face of the
bucket.
5
Both rooted stock
and cuttings are planted
between A-Jacks and
extended into the water
table. Additional cuttings,
rooted stock and grasses are
placed behind the A-Jacks
rows along the earth bank.
O T H E R A R M O R T E C™ B R O C H U R E S
®
RIVERINE, SCOUR AND
STREAMBANK PROTECTION
5
This cabling serves
two purposes. It stabilizes
the matrix during the lift
and place sequence on
“wet” a p p l i c a t i o n s a n d
also aids during the
“ n e s t i n g ” sequence while
turbulent flows begin to seat the
A-Jacks into position.
APPLICATIONS
DROP STRUCTURES
WIERS
BRIDGE SCOUR PROTECTION
ARMORTEC™ is a subsidiary of
ENERGY DISSIPATION
ARMORLOC · A-JACKS COASTAL · ARMORTEC MULTI-PRODUCT
ARMORFLEX HAND PLACED · ARMORWEDGE · ARMORFLEX
ARMORFLEX OS · DITCHLOK
TOE STABILIZATION
STREAMBANK PROTECTION
AUTHORIZED AGENT
9025 Centre Pointe Drive
Suite 400
West Chester, OH 45069
Toll Free (866) 551-8325
www.armortec.com
www.armortecsoftware.com
© 2006 ARMORTEC All Rights Reserved.
AAJ06
E R O S I O N
C O N T R O L
S O L U T I O N S
treambank erosion often produces steep banks with little or no vegetation. These
unprotected banks are even more susceptible to erosion due to over steepening,
loss of ground cover, groundwater discharge, and stream erosion at the base of
the bank. The cost of stabilization may be quite high using conventional hard
methods, particularly for high banks. A-Jacks concrete armor units provide an
alternative which, when used with biostabilization techniques, develops a costeffective solution.
S
A - J A C K S
A-JACKS®
UNIT
®
A-Jacks are high stability concrete armor units designed to interlock into a
flexible, highly permeable matrix. A-Jacks can be installed either randomly or
in a uniform pattern. The interstices formed within the A-Jacks matrix provide
approximately 40% void space in the uniform placement pattern. The voids
provide habitat for fish and other marine life when applied as a reef, revetment or
as a soil support system in river applications. Whether or not A-Jacks are applied as
a revetment on riverbanks or lakeshores, the voids may be backfilled with suitable soils
and planted with a variety of vegetation including grasses, shrubs and trees above the
normal base flow.
ARM THICKNESS FILLET LENGTH
L (INCHES)
®
T (INCHES)
H (INCHES)
C (INCHES)
UNIT
VOLUME
FT3
WEIGHT
LBS (APPROX)
AJ-24
24
3.68
1.84
0.56
78
AJ-48
48
7.36
3.68
4.49
629
AJ-72
72
11.04
5.52
15.14
2,120
AJ-96
96
14.72
7.36
35.87
5,022
AJ-120
120
18.40
9.20
70.69
9,699
Estimated Concrete Density - 140 PCF
B R I D G E
S C O U R
A P P L I C A T I O N
A P P L I C A T I O N
A - J A C K S
U N I T S P E C I F I C AT I O N S
Licensed by Atkinson-McDougal Holdings, Inc. under one or more of U.S. Patent Nos. 5190403. Canadian patent applied for.
Inspection of
Scour Prone Bridge
S T R E A M B A N K
LENGTH
®
A T
W O R K
F I E L D
A N D
L A B
T E S T I N G
Flow Associated
with Storm Event
The ability of the A-Jacks system to dissipate energy and
resist the erosive forces of flowing water allows this system
to protect channel boundaries from scour and erosion.
Extensive laboratory research was performed on both
model and full scale units in order to evaluate the hydraulic
properties of the A-Jacks units. Field tests confirmed that
the A-Jacks system provides a flexible, nonerodible barrier
between the channel subgrade and the potentially
damaging flow of water. An A-Jacks Design Manual for
the hydraulic design of open-channel conveyanceways
and pier scour countermeasures is available upon request.
Localized Pier
Scour
In the hydraulic testing
laboratory, vortices
produced by flowing
water removed bed
material from around the
base of the pier.
Pier Scour
Countermeasures
A-Jacks effectively
resisted the highvelocity flows and
protected the pier from
local scour by reducing
the rate of sediment
transport.