observed elastic movement in accordance with PTI 4, Section 8.3.2.
**************************************************************************
NOTE: If the anchor is not returned to the
Alignment Load after testing, only total movement
data will be available. In this case, only the
minimum apparent free length criteria will apply.
**************************************************************************
1. Minimum Apparent Free Length - The calculated free length
shall be not less than [80] [_____]% of the designed free tendon
length plus the jack length. If the anchor does not meet this
criteria, the anchor shall be restressed from the Alignment Load
to the Test Load and the apparent free length shall be
recalculated. If the anchor does not meet this criteria after 3
attempts (original plus 2 restresses), the anchor shall be
rejected.
2. Maximum Apparent Free Length - The calculated free length
shall be not more than 100% of the designed free tendon length
plus 50% of the bond length plus the jack length. If the anchor
does not meet this criteria, and the cause of the behavior is not
investigated and explained to the satisfaction of the Contracting
Officer, the anchor shall be rejected.
c. Initial Lift-Off Reading - The initial lift-off reading shall be
within 5% of the specified Lock-off Load. If the anchor does not meet
this criteria, the anchor shall be adjusted as necessary and the
lift-off reading shall be repeated.
3.6.2
Replacement of Rejected Anchors
**************************************************************************
NOTE: For redesign of anchored structure due to
relocation of anchor, see note at paragraph DRILLING
HOLES, General.
**************************************************************************
Any anchor that fails the performance or proof test or is rejected by the
Contracting Officer shall be replaced. A replacement anchor, including a
new anchor hole, shall be provided by the Contractor at no expense to the
Government. The location of the replacement anchor shall be as [directed
by the Contracting Officer] [determined by the Contractor in accordance
with the redesign of the anchored structure]. The Contractor shall provide
all materials, supplies, equipment, and labor necessary to provide a new
anchor assembly to the satisfaction of the Contracting Officer. No
drilling shall be performed for a replacement anchor until the grouting of
all rock anchors within [15] [_____] meters [50] [_____] feet of the
replacement anchor location has been allowed to set for at least 24 hours.
Payment will not be made for rejected or failed anchors. The Contractor
shall either remove failed anchors and thoroughly ream and clear the anchor
hole or remove the load and cut the anchor and casing flush.
-- End of Section --
SECTION 02490
Page 41
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