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38
Created November 2021
Appendix C
Encountering Rock
Complete the following steps to install CR Post 1 Bottom and SYTP
®
when encountering rock.
If compactable, the material removed from the hole may be used for the backfill.
CR POST
The CR Post 1 Bottom must be installed full depth,
Complete the following steps to install CR Post 1 Bottom:
1. Drill a 9”-12” [225 mm-300 mm] diameter hole into the rock for a full length installation of the CR
Post 1 Bottom.
2. Insert the CR 1 Bottom post into the hole. See Step 3 for CR Bottom Post 1 Bottom orientation.
3. Ensure the ears of the CR Post 1 Bottom will not protrude more than 4” [100 mm] above the finished
grade.
4. Backfill the hole with material in 6" [150 mm] lifts and compact to optimum compaction.
SYTP
®
Select Case A or Case B unless there is a more restrictive state/specifying agency specification.
NOTE: For Case A, the post must be embedded a minimum of 24” [600 mm] into the rock.
Case A
If rock is encountered
within a depth of 16” [400 mm] from the finished grade
, complete the following
steps to install the SYTP
®
Post:
1. Drill a 21”-24” [525 mm-600 mm] diameter hole a minimum 24” [600 mm] deep into the rock.
2. A portion of the SYTP
®
will have to be removed. The amount to be cut off from the bottom of the
SYTP® is determined by measuring from the finished grade to the bottom of the hole and subtracting
that measurement from 40” [1000 mm]. The difference is the amount to be cut off.
3. Insert the cut off SYTP
®
into the hole.
4. Ensure the center of the SYTP
®
yielding holes are approximately at the finished grade.
5. Backfill the hole with material in 6" [150 mm] lifts and compact to optimum compaction.
6. Ensure SRT™ 31 System Anchor Guardrail height is approximately 31” [787 mm] above the finished
grade.
Case B
If rock is encountered at a depth
greater than 16” [400 mm] from the finished grade
, complete the
following steps to install the SYTP
®
:
1. Drill an 8”-12” [200 mm-300 mm] diameter hole into the rock so the full length SYTP
®
can be installed
in the hole.
2. Install the SYTP
®
into the hole.
3. Ensure the center of the SYTP
®
yielding holes are approximately at the finished grade.
4. Backfill the hole with material in 6" [150 mm] lifts and compact to optimum compaction.
5. Ensure the
SRT™ 31 System Anchor Guardrail
height is approximately 31” [787 mm] above the
finished grade.
