WIRE ROPE SAFETY FENCE
SPECIFICATION FOR BRIFEN WIRE ROPE SAFETY FENCE
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General Requirements |
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Description of Components |
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Component Manufacturing Requirements |
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Installation |
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List of European & National Standards |
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Drawings |
A.3 COMPONENT MANUFACTURING REQUIREMENTS
Tolerances
1. Tolerances on ropes, plates
and sections shall be in accordance with the relevant British Standards. Tolerances on fabricated components shall
be as stated on Drawings. Lengths of ropes shall be measured in the factory. Components, which are to be galvanised
or metal coated, shall be measured before galvanising or metal coating.
Protective Finish
2. All steel components, excluding
stainless steel items, reinforcing rings, ropes and threaded terminals for ropes, shall be hot-dip galvanised in
accordance with BS 729. Protective finishes for ropes and threaded terminals shall be as specified in clauses A.3.5
and A.3..8 respectively.
Marking
3. All posts shall be clearly
and durably marked with the manufacturer’s identification mark.
Welding
4. Welding shall comply with the
requirements of BS 5135. The welding consumables and procedures used shall be such that the yield and tensile strengths
of deposited weld metal will not be less than the respective minimum values of the parent metal being welded. Written
welding procedures shall be prepared and all test records shall be kept available for inspection.
- Butt welded joints between anchor plates and frames shall comply with the requirements of quality category A (Table 18, BS 5135).
- Fillet welds securing anchor plates to anchor frames and angles to surface mounted posts shall comply with the requirements of quality category A (Table19, BS 5135) and, in addition, shall be free from surface cavities and the extent of any porosity or inclusions on the weld surfaces shall not exceed levels specified for butt joints of quality category A (Table 18, BS5135). All other fillet welds shall comply with the requirements of quality category D (Table 19, BS 5135) and in addition, shall be free from surface cavities and the extent of any surface porosity shall not exceed the levels specified for butt joints of quality category D (Table 18, BS 5135).
- Weld surfaces shall be cleaned of slag residues and any sharp edges shall be smoothed. All weld spatter shall be removed from the work and affected surfaces dressed and cleaned.
Ropes
5. Component ropes and tail ropes
shall consist of steel ropes, fitted with threaded terminals, as shown on Drawing No. LB/02. The ropes shall be
19mm diameter, 3 x 7 (6/1) coreless construction, complying with BS 302: Part 1. All wire used for the ropes shall
be general purpose wire to BS 2763, 3mm, grade 1370, A, finally zinc coated. The minimum breaking load of the rope
fitted with the threaded terminal shall be 16. 7 tonnes.
6. Component ropes and tail ropes
shall be prestressed in the factory by applying a cyclic loading which shall be continued until all initial extension
has been removed eg. the lower limit of cyclic loading may be 1.7 tonnes and the upper limit 8.9 tonnes. The rope
shall exhibit a minimum modulus of elasticity of 8,300 kg/mm2 based on an area of 283mm2 after prestressing. Well attested and documented evidence of this requirement shall be
provided.
7. Safety check ropes shall consist
of steel ropes, fitted with a clevis fitting at one end and an ordinary thimble at the other end, a shown on Drawing
No. LB/02. The ropes shall be 8mm diameter, 6 x 19 (9/9/1) IWRC (independent wire rope core) construction, complying
with BS 302:
All wires used for the safety check ropes shall be general purpose wire to BS 2763, grade 1770, A, drawn of finally
zinc coated. The minimum breaking load of the check rope assembly shall be 3.7 tonnes.
Rope Fittings
8. Threaded terminals, clevis
fittings, ordinary thimbles, rigging screws, pins, split cotter pins, nuts and washers shall be as described on
Drawing No. LB/02. Threaded terminals shall be treated in accordance with BS 1706, Class B or in accordance with
BS729.
9. Posts shall be as described
on Drawing No. LB/03 and LB/10. Posts shall be manufactured from steel, 6mm thick, grade S355 to EN10025, formed
to the required shape; hammering is not permissible. Surface defects and edge laminations or cracks revealed or
occurring during fabrication shall be treated in accordance with the requirements of BS 4360.
Post Fittings
10. Locating pegs, nuts, post
caps and excluders shall be as described on Drawing No. LB/03 and LB/04.
Post Foundations
11. Precast and in-situ concrete
foundations shall be as shown on Drawing No. LB/04 unless otherwise described.
Anchor Frames
12. Anchor frames shall be as
described on Drawing No. LB/117.
Testing of Rope Terminals
13. The manufacturer shall arrange
for the tensile test to destruction to be carried out annually, or whenever the production technique is changed,
by a competent independent body or association. The tensile test piece shall consist of a threaded terminal and
length of rope at least 600mm in length. The method of measuring the breaking load shall comply with Appendix B
of BX 3002 : Part 1.
Handling
14. All components shall be protected
from damage and handled and stacked in such way that permanent damage is not caused, particularly to threaded components.
Means shall be provided to avoid to damage to galvanised coatings and any damage that does	occur shall be
made good in accordance with BS 729, Appendix D. Component ropes and tail ropes shall be supplied on reels with
a barrel diameter of not less than 450mm. Ropes shall not be twisted or kinked.
Specificatons Index
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