TrinityHighway.com
15
Revision A November 2021
Assembly on a Curve
Horizontal Curve
Complete the following steps to place the posts or post foundations along a curve.
1. When the cable is placed on a curve, post spacing may need to be reduced based
on the radius.
2. Weak soil conditions may necessitate a larger/deeper footing for the line posts,
based on the radius of the curve.
3. When placing posts on a curve, use the table below to adjust the spacing as required:
Curve Radius
Post Spacing
0 to 650’
CASS
®
is not recommended.
650’ to 1300’ [198 m to 396 m]
10’ [3.05 m] post spacing or less (as specified by the state/specifying
agency)
Greater than 1301’ [396 m]
16’-4” [5 m] post spacing or less (as specified by the state/specifying
agency)
Note:
If any of the post spacing for a particular radii grouping is larger than the contract
specifications, use the contract specification post spacing.
Vertical Curve
For a sag vertical curve, the recommended minimum K value is 100’ [30 m]
. There is no K value
limit for crest vertical curves.
K= L / (g
1
-g
2
)
L = length of vertical curve in feet [meters) between the two tangents
g
1
= grade of tangent in
g
2
= grade of tangent out
When the minimum sag vertical curve value is not met, the use of intermediate terminals at the
low point of the sag curve is recommended to minimize the cables from rising beyond the
allowable height tolerance relative to grade.
Line Post Foundation Placement
Warning:
If the post cannot be placed, pursuant to these assembly
instructions, because of soil conditions, or any other environmental factor,
please contact the state/specifying agency immediately! NEVER attempt to
place posts if these assembly instructions cannot be complied with.
Post Alignment
Lay out the post alignment and post spacing according to the contract specifications.
Maximum post spacing is 16’-4” [5 m].
Driven Foundation Sleeve With and Without Soil Plate
Complete the following steps for a driven foundation sleeve assembly.
1. Drive the foundation sleeve (PN-33950G) or foundation sleeve with soil plate (PN-
33952A) with an appropriate driving head. During the driving process ensure that the
sleeve is aligned, properly oriented (with interior tabs 15” [375 mm] from the top of the
tube sleeve and the 3” [75 mm] side parallel to the roadway), soil is prevented from
coming up into the sleeve, and the sleeve is not damaged.
