www.highwayguardrail.com 15 Revised: October 5, 2009
INSTALLING HBA™ BOTTOM POSTS
Complete the following steps to install HBA™ Bottom Posts:
Step Actions
1.
Arrange the posts so that the large hole (
13
/
16
” [21 mm]) is placed
downstream (away from the impact end of the systems).
2.
Adjust the offset to Post 2, if the ET-PLUS™ Extruder (Head)
causes a gap between the rail panel and Post 2.
Note: The rail panel must be within
1
/
2
” (13 mm) of Post 2.
3.
Select Option A or Option B for this installation.
Option
A
1. Drive the HBA™ Bottom Posts (PN-33873A,
PN-33874A) with an approved driving head
to the appropriate depths. The appropriate
depth will be approximately 72” (1830 mm)
for post PN-33873A, at Posts 1 and 2 and
44” (1120 mm) for post PN-33874A, at Posts
3 through 8, Posts 3 through 7, or Posts 3
through 4.
For HBA™ Bottom Posts (PN-33873A) at Posts 1
and 2
1. Drill a 12” (300 mm) maximum diameter pilot
hole approximately 72” (1830 mm) deep.
Option
B
For HBA™ Bottom Posts (PN-33874A) at Posts 3
through 8, Posts 3 through 7, or Posts 3 through
4
1. Drill a 12” (300 mm) maximum diameter pilot
hole approximately 44” (1120 mm) deep.
2. Insert the posts to the appropriate depth by
impact or vibratory means with an appropriate
driving head.
3. Backfill the hole with compactable materials in 6"
(150 mm) lifts and compact with pneumatic
equipment to optimum compaction.
Note: In either option, the optimum depth will have the
13
/
16
” (21
mm) hole in the post plates (ears) even with the finished grade.
WARNING: Ensure that the proper Leaveout (specified
area of open space in the pavement) around the posts is
reserved and filled with state/specifying agency approved
backfill material that will not prevent movement, for any
posts installed in rigid pavement such as any thickness of
concrete or asphalt. Failure to follow this warning could
result in serious injury or death in the event of a collision.
INSTALLING FOUNDATION TUBES, HBA™ POSTS, OR SYTP™
WHEN ENCOUNTERING ROCK
Complete the following steps to install foundation tubes, HBA™ posts or
SYTP™ when encountering rock:
Step Actions
1.
Select Option A or Option B below when encountering rock,
unless there is a more restrictive state/specifying agency
specification.
Option
A
If rock is encountered with depth of 20" (510
mm) or less
1. Drill a 12" - 16" (300 mm - 400 mm) diameter
hole into the rock.
2. Drill the hole 2" (50 mm) deeper than the
required embedment depth.
3. Place granular material or small pieces of the
drilled rock in the bottom 2" (50 mm) of the hole
for drainage.
Continues on next page.
Revised: March 2010
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