User's Manual

Ingal Civil Products
page 4
Release 002
Flexfence
4.3 END TERMINALS
End terminals are designed to provide a soft gating impact
to prevent vehicles from launching or snagging upon impact
with Flexfence WRSB.
4.3.1 TL3 Flexfence Terminal
The TL3 Flexfence Terminal has been crash tested to meet
the requirements of NCHRP 350 Test Level 3 (TL3). The
Flexfence TL3 Terminal is the only TL3 terminal proven
NOT to release the cables during approach impacts. The
non-release of cables ensures the system remains tensioned
and functional in the event of secondary impacts occurring
downstream from the end anchor.
System features;
• System Length: 12m
• Point of Need: 12.6m from anchor point
• Post Spacing: 1.0m
4.3.2 Standard Flexfence Terminal
The Standard Flexfence Terminal is designed to provide the
necessary tensile support to redirect errant vehicles that
impact the wire rope barrier near the end of the system.
Consideration has been given to preventing vehicle
launching and snagging, however this terminal has not been
subject to full scale crash testing.
System features;
• System Length: 4.2m to 1st post
• Point of Need: 2nd Post
5.0 INSTALLATION
The following written instructions should be read in
conjunction with Ingal Civil Products’ Drawings:
WR-STD-57 4 Rope TL3 Post Arrangement
WR-STD-60 3 Rope TL4 Post Arrangement
WR-STD-50 TL3 End Terminal Arrangement
WR-STD-55 Standard End Terminal Arrangement
WR-STD-51 Standard End Terminal Type 1 Anchor Block
WR-STD-28 Standard End Terminal Type 2 Anchor Block
WR-STD-52 TL3 End Terminal Type 1 Anchor Block
WR-STD-53 TL3 End Terminal Type 2 Anchor Block
WR-STD-59 Tension Panel Arrangement
5.1 Site Preparation
The approach terrain to the barrier should be level. Grading
to 1:20 is preferable and 1:10 maximum slope should be
present. Steeper slopes can result in the vehicle impacting
the barrier at other than the design height.
5.2 Horizontal and Vertical Alignment Criteria
The minimum allowable sag vertical curve is ≥ 30m. (K
= length of VC in metres divided by the change in grade
expressed as a percentage). There is no K value limit for
crest curves.
The installation of wire rope barriers on horizontal curves
may increase the expected dynamic defl ection. Please refer
to Appendix A for suggested correction factors.
5.3. End Anchor Site Preparation
The site should be prepared free of obstructing vegetation
and other hazards that may interfere with the installation
or operational performance of the system. Some sites may
require minor grading if installed beyond the edge of the
pavement shoulder.
Vehicles impacting the end of the terminals will normally
continue behind and beyond the barrier and may encounter
non-traversable terrain or other roadside hazards. It is
recommended that the guidelines as stated in AS/NZS
3845:1999 for the installation of gating safety barrier end
terminals be observed.
AS/NZS 3845:1999 requires that a Hazard Free Zone
‘immediately behind the terminal... should be reasonably
traversable and free from fi xed object hazards. If a clear
runout is not possible, this area should be similar in
character to adjacent unshielded roadside areas’
Flexfence Pro Man.indd 4Flexfence Pro Man.indd 4 30/11/07 10:46:33 AM30/11/07 10:46:33 AM