Dowel Cradles
Load Transfer System
Industrial Slab on Ground
 Designed for load transfer
and deflection control at
sawn contraction joints
 Dowels, sleeves and chairs
incorporated in one system
 Ensures the accurate
placement and accurate
alignment of the dowels
within the slab
Dowel Cradles
Load Transfer System
Product Description
Features
Dowel Cradles are designed to provide a total joint
system solution by incorporating two systems in
the one solution, being the dowels and sleeves as
the load transfer system and the wire cage that acts
as a bar chair and spacer. The wire cage ensures
that the dowels are maintained at the correct
height and spacing during the pouring of the slab.
Dowel Cradles are available in standard off the shelf
sizes or to customer specifications. Dowel Cradles
are designed for efficiently limiting deflection in
contraction joints in concrete slabs and pavements.
1. Dowels, covers and chairs incorporated in one system.
2. The wire cradle construction ensures the accurate placement and
alignment of the dowels at the correct centres and height within
the slab.
3. Supplied in standard 3 m lengths, cradles with larger dowel sizes
may be shorter in length.
4. Dowels made from AS/NZS 3679.1, Grade 300 steel.
5. Dowel sleeves allow for both contraction and lateral movement.
Advantages
Note:
•
Round Dowel Cradles do not allow for lateral
movement.
•
For larger sized dowels the cradle length is
reduced, limited by a maximum weight of 20 kg
for which can be safely handled by one man.
Slab Deflection
Dowel Cradles allow for the lateral and longitudinal
movement of the dowel while preventing slab
deflection at the joint. This greatly reduces the risk
of damage to the joint edges prolonging the lifecycle of the slab.
Sectional View of Dowel Cradle
•
•
P rovides fast and accurate placement of the dowel systems.
Wire cage ensures correct horizontal and vertical dowel
placement.
•
Available off the shelf in standard sizes.
•
Simple installation, minimising setup time and costs.
•
Reduces the risk of restraint.
•
Provides fast and accurate horizontal and vertical placement.
Dowel Cradles superior engineered
performance controls floor flatness
limiting joint spalling.
Slab deflection
Benefits
Please Note: This drawing is not to scale but
illustrational to highlight potential load deflection.
Plastic sleeve or
shrink wrapping
Concreter Benefits
Engineering Benefits
• Speed of dowel placement.
• Accuracy of dowel placement
(Engineering sign off).
• Allows continuous pour
through.
• Lowest placement cost.
• Greater stakeholder
satisfaction.
• Provides high performance in
controlling joint deflection.
• Wire baskets provide accuracy
of the dowel placement.
• Height and centres accuracy of the
dowel placement ensures the most
effective load transfer performance.
Asset Protection Benefits
• Reduces the risk of spalling
damage to the concrete at
the joints.
• Reduces floor maintenance
costs over the life-cycle of
the facility.
• Reduces wear and tear on
tenant’s materials handling
equipment.
(1)
• Provides a smoother floor
surface at the Joints which
ensures tenant efficiency.
• Increases tenant satisfaction
and return on investment.
• Extends the life-cycle of the
facility.
Dowel Cradles
Load Transfer System
Dowel Cradle (Plan View)*
Standard cradle length 3000 mm
Centres as specified
Dowel positions alternate
Travel bars to be cut
before pouring concrete
Section At Contraction Joint*
Standard dowel length 300 mm
½ Slab height
Slab height
Early entry sawcut
(¼ slab height)
standard dowel
options 6 mm
or 10 mm
* PD3™ example shown, typical for all cradle type.
Material Technical Data
COMPONENT
DIMENSION
(mm)
MATERIAL TYPE
MATERIAL
STANDARDS
STEEL GRADE
EQUIVALENT
YIELD
STRESS
(MPa)
TENSILE
STRENGTH
(MPa)
STANDARDS
COMPLIANCE
6 mm
Dowel
6 x 300
Cold Drawn Steel
Q345
≥ Grade 300
345
550
AS/NZS 3679.1
10 mm
Dowel
10 x 300
Cold Drawn Steel
Q345
≥ Grade 300
345
550
AS/NZS 3679.1
Round/Square
Dowel
VARIES
Cold Rolled Steel
Q345
≥ Grade 300
345
550
AS/NZS 3679.1
Wire Cage
Ø5.6
Hard Drawn Wire
AS/NZS 4671
Grade 500L
500
650
AS/NZS 4671
Travel Bars
Ø4
Ribbed Wire
AS/NZS 4671
Grade 500L
500
625
AS/NZS 4671
Manufacturing Tolerances
OVERALL LENGTH
±10 mm
OVERALL HEIGHT
±5 mm
(2)
DOWEL CENTRES
±5 mm
Dowel Cradles
Load Transfer System
ACI 360-R10 States (Chapter 6.2 - Load Transfer Mechanisms)
PD3™ Dowel Cradle
“Joint and crack stability measurements below 0.25 mm for joints or cracks
subjected to lift truck traffic with small hard wheels will have good service life”
Panels shrink diagonally from corners.
If the left side panel shrinks more than the right side panel differential shrinkage
needs to be accommodated
A tapered shaped dowel cradle
that allows for lateral movement
of the dowel without the need for
bulky plastic sleeves with cavities.
The thin shrink wrap sleeve
de-bonds the dowels from the
concrete and eliminates the need
for a plastic sleeve or grease.
As the panels shrink, a small void
develops in the concrete by
the tapered dowel, allowing for
differential parallel shrinkage
Tapered PD³™ Dowel
(dowel orientation alternates)
Joint opens up due
to slab shrinkage
PD3™ Dowel Cradle (Standard Sizes)
PRODUCT CODE
SLAB HEIGHT
(mm)
* DOWEL
HEIGHT
(mm)
LENGTH
(mm)
DOWEL
TYPE
FINISH
DOWEL
CENTRES
(mm)
WEIGHT
PER LENGTH
(kg)
LENGTHS
PER PACK
WEIGHT
PER PACK
(kg)
PD306450125BLK
125
65.5
3000
PD³6
Blk.
450
8.0
25
200
PD306450125G
125
65.5
3000
PD³6
Galv.
450
8.0
25
200
PD306450150B
150
78
3000
PD³6
Blk.
450
8.1
25
202.5
PD306450150G
150
78
3000
PD³6
Galv.
450
8.1
25
202.5
PD306450175B
175
90.5
3000
PD³6
Blk.
450
8.2
25
205
PD306450175G
175
90.5
3000
PD³6
Galv.
450
8.2
25
205
PD306450200B
200
103
3000
PD³6
Blk.
450
8.3
25
207.5
PD306450200G
200
103
3000
PD³6
Galv.
450
8.3
25
205
PD310450150B
150
80
3000
PD³10
Blk.
450
11.5
25
205
PD310450150G
150
80
3000
PD³10
Galv.
450
11.5
25
207.5
PD310450175B
175
92.5
3000
PD³10
Blk.
450
11.5
25
207.5
PD310450175G
175
92.5
3000
PD³10
Galv.
450
11.5
25
287.5
PD310450200B
200
105
3000
PD³10
Blk.
450
11.6
25
287.5
PD310450200G
200
105
3000
PD³10
Galv.
450
11.6
25
287.5
* To top of dowel
(3)
Custom sizes available to customer specification by quote.
Contact Customer Service for further details.
Dowel Cradles
Load Transfer System
Plate Dowel Cradle™
Panels shrink diagonally from corners
If the left side panel shrinks more than the right side panel differential shrinkage
needs to be accommodated
Joint opens up due
to slab shrinkage
A rectangular shaped plate
cradle that allows for lateral
movement of the dowel.
The dowel sleeve provides a
de-bonded surface against the
concrete while also providing for
lateral movement of the dowel.
As the panels shrink, a small
void develops in the concrete
by the dowel sleeve allowing for
differential parallel shrinkage
Rectangular plate dowel
(dowel orientation alternates)
Plate Dowel Cradle™ (Standard Sizes)
Product Code
Slab
Height
(mm)
Dowel
Height
(mm)
Length
(mm)
Dowel
Size
(mm)
Finish
Dowel
Centres
(mm)
Weight per
Length
(kg)
Pack
QTY
Weight
per Pack
(kg)
DCP06450125B
125
62.5
3000
6
Blk.
450
8.4
25
210
DCP06450125G
125
62.5
3000
6
Galv.
450
8.4
25
210
DCP06450150B
150
75
3000
6
Blk.
450
8.5
25
212.5
DCP06450150G
150
75
3000
6
Galv.
450
8.5
25
212.5
DCP06450175B
175
87.5
3000
6
Blk.
450
8.6
25
215
DCP06450175G
175
87.5
3000
6
Galv.
450
8.6
25
215
DCP10450150B
150
75
3000
10
Blk.
450
11.8
25
297.5
DCP10450150G
150
75
3000
10
Galv.
450
11.8
25
297.5
DCP10450175B
175
87.5
3000
10
Blk.
450
11.9
25
297.5
DCP10450175G
175
87.5
3000
10
Galv.
450
11.9
25
297.5
DCP10450200B
200
100
3000
10
Blk.
450
12
25
300
DCP10450200G
200
100
3000
10
Galv.
450
12
25
300
* To top of dowel
(4)
Custom sizes available to customer specification by quote.
Contact Customer Service for further details.
Dowel Cradles
Load Transfer System
Square Dowel Cradle
Panels shrink diagonally from corners.
If the left side panel shrinks more than the right side panel differential shrinkage
needs to be accommodated
A square dowel cradle that allows
for lateral movement of the
dowel particularly in larger load
applications and joints with larger
shrinkage.
The dowel sleeve provides a
de-bonded surface against the
concrete while also providing for
lateral movement of the dowel.
A small void develops in
the concrete by the dowel
sleeve allowing for differential
parallel shrinkage
Joint opens up due
to slab shrinkage
Square Dowel and sleeve
- Dowelmaster™ or Metal Dowel
Cover (dowel orientation alternates)
Square Dowel Cradle (Typically Ordered Custom Sizes)
Dowel Size
Typical Dowel
Length
(mm)
Typical Dowel
Centres
(mm)
Material
Cover
Cradle
Length
(mm)
Slab Height
(mm)
SQ16
400 / 500 / 600
300 / 400 / 450 / 500 / 600
Blk / Galv / SS (304)
Metal Dowel Cover
3000
100 to 380
SQ20
400 / 500 / 600
300 / 400 / 450 / 500 / 600
Blk / Galv / SS (304)
Metal Dowel Cover/
Dowelmaster™
3000
100 to 380
SQ25
400 / 500 / 600
300 / 400 / 450 / 500 / 600
Blk / Galv / SS (304)
Metal Dowel Cover
3000
100 to 380
SQ32
400 / 500 / 600
300 / 400 / 450 / 500 / 600
Blk / Galv / SS (304)
Metal Dowel Cover
3000
100 to 380
SQ40
400 / 500 / 600
300 / 400 / 450 / 500 / 600
Blk / Galv / SS (304)
Metal Dowel Cover
1000
100 to 380
SQ50
400 / 500 / 600
300 / 400 / 450 / 500 / 600
Blk / Galv / SS (304)
Metal Dowel Cover
1000
100 to 380
Custom sizes available to customer specification by quote.
Contact Customer Service for further details.
(5)
Dowel Cradles
Load Transfer System
Flat Plate Dowel Cradle
Panels shrink diagonally from corners.
If the left side panel shrinks more than the right side panel differential shrinkage
needs to be accommodated
A rectangular shaped plate
dowel cradle that allows for
lateral movement of the dowel.
Supported by bar chairs, the
cradle height is determined by
the chair.
The dowel sleeve provides a
de-bonded surface against the
concrete while also providing for
lateral movement of the dowel.
As the panels shrink, a small
void develops in the concrete
by the dowel sleeve allowing for
differential parallel shrinkage
Joint opens up due
to slab shrinkage
Rectangular plate dowel
(dowel orientation alternates)
Flat Plate Dowel Cradle (Custom Sizes)
Dowel Size
Typical Dowel
Length
(mm)
Typical Dowel
Centres
(mm)
Material
Cover
Cradle
Length
(mm)
Slab Height
6 mm
300
300 / 400 / 450 / 500 / 600
Blk / Galv
Plastic Sleeve
(Orange)
3000
Flat
10 mm
300
300 / 400 / 450 / 500 / 600
Blk / Galv
Plastic Sleeve
(Blue)
3000
Flat
Custom sizes available to customer specification by quote.
Contact Customer Service for further details.
(6)
Dowel Cradles
Load Transfer System
Round Dowel Cradle
A Round Dowel Cradle that
meets the specification of road
authorities throughout Australia
and New Zealand.
The shrink wrapping on the dowel
provides a de-bonded surface
against the concrete.
NOTE: Round Dowel Cradles do
not allow for lateral movement.
The shrink wrapping allows for
the debonding of the dowel from
the concrete, but does not allow
for differential parallel shrinkage
Joint opens up due
to slab shrinkage
Round Dowel with shrink wrapping
(shrink wrapped end alternates)
Round Dowel Cradle (Typically Ordered Custom Sizes)
Dowel Size
Typical Dowel
Length
(mm)
Typical Dowel
Centres
(mm)
Material
Cover
Cradle
Length
(mm)
Slab Height
(mm)
R16
400 / 500 / 600
300 / 400 / 450 / 500 / 600
Blk / Galv / SS (304)
Shrink Wrapping
3000
100 mm to 380
R20
400 / 500 / 600
300 / 400 / 450 / 500 / 600
Blk / Galv / SS (304)
Shrink Wrapping
3000
100 mm to 380
R24
400 / 500 / 600
300 / 400 / 450 / 500 / 600
Blk / Galv / SS (304)
Shrink Wrapping
3000
100 mm to 380
R27
400 / 500 / 600
300 / 400 / 450 / 500 / 600
Blk / Galv / SS (304)
Shrink Wrapping
3000
100 mm to 380
R30
400 / 500 / 600
300 / 400 / 450 / 500 / 600
Blk / Galv / SS (304)
Shrink Wrapping
3000
100 mm to 380
R33
400 / 450/ 500 / 600
300 / 400 / 450 / 500 / 600
Blk / Galv / SS (304)
Shrink Wrapping
3000
100 mm to 380
R36
400 / 500 / 600
300 / 400 / 450 / 500 / 600
Blk / Galv / SS (304)
Shrink Wrapping
3000
100 mm to 380
Custom sizes available to customer specification by quote.
Contact Customer Service for further details.
(7)
Dowel Cradles
Load Transfer System
Tie Bar Dowel Cradle
Panels shrink diagonally from corners.
Locking the joint promotes greater
shrinkage from opposing slab side.
A deformed dowel cradle for tying
adjacent slabs together at the joint.
Provided without sleeves and welded
on both sides to promote greater
binding of slabs either side of the joint.
Ribs on dowel prevent joint from
opening due to shrinkage.
Deformed dowel
Locked joint
Tie Bar Dowel Cradle (Custom Sizes)
Dowel Size
Typical Dowel
Length
(mm)
Typical Dowel
Centres
(mm)
Material
Cover
Cradle
Length
(mm)
Slab Height
(mm)
N12
600 / 800/ 1000
500 / 600 / 800
Blk / Galv
None
3000
100 to 380
N16
600 / 800/ 1000
500 / 600 / 800
Blk / Galv
None
3000
100 to 380
Custom sizes available to customer specification by quote.
Contact Customer Service for further details.
(8)
Dowel Cradles
Load Transfer System
Installation Guide
Correct Cradle Installation:
1. Saw-cut approximately ¼ of slab depth.
4. Bar chairs should keep the mesh parallel at consistent depth
2. Dowel height at ½ slab height.
5. Bar chairs should be as close to the cradle as practical.
3. The mesh should be supported by bar chairs to rest
approximately ⅓ of the slab height.
6. Mesh should not overhang past the edge line of the cradle.
7. Mesh should not touch the edge of the cradle, allowing concrete
flow between the mesh and the cradle.
Incorrect Cradle Installation:
1. Mesh is too close to top
surface of the slab.
2. Mesh is too close to the
line of the saw-cut.
Saw-cut too shallow to be
effective, the crack has not
generated from the top of
the slab therefore the crack
has found its own path to
the surface.
Saw-cut too deep, the load
transfer system has been cut
and therefore has rendered
it ineffective in controlling
deflection.
(9)
Dowel Cradles
Load Transfer System
Tools Required: Mark Out Paint | Hammer | Wire Cutter
Step 1.
Step 3.
iNSTALLATION
iNSTALLATION
• Mark out joint lines on sub-grade with mark out paint to allow straight and
• The mesh should be supported by bar chairs to rest approximately ⅓ of the
accurate placement of the Dowel Cradles.Place cradles along mark out lines with
slab height. Make sure mesh is placed back from the joint line (in line with
the dowel centred over joint line.
the edge rail of the cradle), do not place directly on the cradles.
• Place cradles end to end ensuring dowel spacing is maintained at correct specified
• Make sure mesh is placed back from the joint line (in line with the edge rail
spacing. Cradles can be cut to provide infill lengths. Optional Danley™ Hold Down
of the cradle), do not place directly on the cradles.
Stakes can be used to secure the cradles in position for the pour.
• Pour through concrete, ensuring that both the cradles and the reinforcement
Important: Do not run cradles through intersections. See intersection
are not displaced.
positioning diagrams below for correct layout.
Step 4.
Step 2.
iNSTALLATION
iNSTALLATION
• Prior to the pour, cut the 4 mm travel bars (3 cross wires that hold the wire
frames together). Failure to do so may lock the joint.
• Form the joint with a soffcut (¼ slab depth) as soon as the concrete will
support the saw and operator. This is usally within 2-4 hours of the last pass
of the power trowel.
Dowel Cradle Positioning
3-Way Intersection Detail
4-Way Intersection Detail
Standard Length Detail
Construction Joints
ArmourMate™ or loose dowels
(Diamond™ Dowels) positioned around
the perimeter of each concrete pour.
Contraction Joints
Dowel Cradles positioned at the
soffcut joint lines.
( 10 )
Typical 30 x 30 meter slab panel.
Installation
Installation Process
1.
Companion Products
1. ArmourMate™
For edge protection of construction joints, Danley™ ArmourMate™ provides a range of solutions to best prevent damage
and joint spalling associated with impact from materials handling equipment and other traffic. Joint edge protection
systems can be incorporated into Danley™ full joint solutions with sacrificial formwork and load transfer systems.
2.
2. Diamond™ Dowel
Diamond™ Dowels are plate dowels suited for construction joints in concrete slabs and pavements. They transfer
vertical loads across the joint and minimise differential deflection between adjacent slab panels under load. Easy
to install they attach directly to wooden formboard or metal separation plates. They come pre-packaged with all
components ready for installation.
3. Crack-A-Joint™
As an option to saw cutting, place Crack-A-Joint™ into the wet concrete along the joint line (above the centre of
the Dowel Cradle), to induce a crack for the full depth of the concrete. The Crack-A-Joint™ is available in standard
3 m lengths formed from galvanised sheet steel to a height of 25 mm. It can be supplied as a plain joint or with a
permanent Rip-A-Strip™ capping in three different colour options (Black, Grey or Sandstone).
3.
4. Ground Crack Inducer
An inverted V-shaped PVC extrusion, 3 m long and available in 25 mm and 50 mm heights. It is positioned on the subgrade before the Dowel Cradles are placed. It produces a weakening in the slab that initiates a crack from the bottom
up. Ground Crack Inducer is optional and should only be used when Crack-A-Joint™ is used, or when saw cuts are to
made in the slab on the same day as the slab is poured.
4.
5. Cradle Hold Down Hook
A small optional wire hook that allows you to anchor the base of your Cradles into the site sub-base. It prevents the
Dowel Cradles from moving during the pour process. They hook over the bottom wire of the Cradles securing them to
the ground.
1300 DANLEY (1300 326 539)
5.
www.danley.com.au | [email protected]
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Disclaimer: The information contained in this publication is intended to give a fair description of the products and their capabilities.
No responsibility or liability by the manufacturers will be accepted for misuse, misreading or deviation from the recommended guidelines of these products.
As new technology is introduced, or industry standards are altered, ITWCS reserves the right to alter the information without notice.