12
Cylinder Inspection
The cylinder should be inspected for:
•
Dented or swollen tube jacket
•
Visible cracks in any welds and fluid leakage from the welds
•
Piston rod surface damage, bending or fluid leakage in seal area
•
If fully collapsed or over design impact speed, disconnect piston rod from the mobile sheave after the unit is pulled out
and push the piston rod in checking for free movement.
If any of these inspections are suspect, replace cylinder and have it examined by the manufacturer. Current models have PTFE
seals with an unlimited static life.
Anchor Bolt Inspection
Anchor bolts may come loose or be damaged upon impact. These bolts may be replaced by welding a nut or putting a double
nut on them and backing them out of the hole. Drill out the old epoxy and reinstall new bolts with new epoxy following previous
instructions on page 7.
Side Panel Inspection
Side Panels are designed to nest and collapse with minimal or no damage upon frontal impact. The side keepers sustain a shock
upon impact. These side keepers should be replaced if there are any signs of fatigue, bending or other visible damage. Inspect
the side panels for any bending or torn metal. If damage is found, any side panel is removable by removing four bolts. It may be
necessary to remove the bolts on the panel upstream to slide out a panel located in the middle of the unit. The side keepers used
to hold the large front sled panels are different than the side keepers on the center panels. Also, the side keeper used on the last
terminal brace, which is the rearmost support, has a shorter shoulder (¼ inch vs. ½ inch), as it does not have a panel overlap.
These shoulders must seat into the outer overlapping panel and pin the inside panel to the frames using a torque value of 270
N-m (200 ft-lbs). Be careful not to pin the edge of the outside panel as it will restrict free sliding of that panel.
Side Guide Inspection
At the bottom of each support frame, there are two guides to stabilize and guide collapse of the attenuator. Inspect each side
guide for damage. These guide assemblies are very rugged. If the side guides are not damaged they can be reused. The torque
value for the side guides is 920 N-m (680 ft-lb). These side guides are stronger than the rail, so visually inspect the rail for
crowns. Any crowning of the rail can be straightened.
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Страница 46: ...42 APPENDIX FIG P SINGLE SLOPE BARRIER...
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Страница 52: ...48 APPENDIX FIG S 2 SPANNER 06 50...
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Страница 55: ...51 APPENDIX U TRANSITION CONCRETE BLOCK 36 44 INCH 914 1118 mm...
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