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TTJ has successfully designed and developed a
comprehensive range of standard two-rail and
three-rail aluminium parapets for use in
flyovers and expressways. The parapets have
proved not only convenient to install, but also
aesthetically pleasing.
All the parapets are built to the stringent requirements
of the "United Kingdom Department of Transport-Technical Memorandum on the
Design of Highways Bridge Parapets BS 6779 Part 3 : 1984", and are tested
and authenticated by full scale vehicle impact tests carried out in Singapore
and the United Kingdom.
TTJ is also a leading supplier to contractors in Hong Kong for
roadwork contracts complying to High way Department specifications :SSD-23, 24,
86 and 89.
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T T J has designed and developed a comprehensive range of standard two-rail and three-rail aluminium parapet for
flyovers and expressways |
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A Transverse and Longitudinal static load test in progress for End or Intermediate
post at test lab |
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A Transverse and Longitudinal static
load test in progress for rail or splice member at test lab |
Static Load Test Result
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Loading Condition |
Max. Test Load |
Deflection |
Remarks |
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Intermediate Post |
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Horizontal
Transverse load |
42.01 kN |
28.30 mm |
Broke at the
aluminium section and adjacent to weld |
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Horizontal
Longitudinal load |
23.61 kN |
22.80 mm |
Broke at the
aluminium section and adjacent to weld |
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End
Post |
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Horizontal
Transverse load |
47.05 kN |
20.20 mm |
Broke at the
aluminium section and adjacent to weld |
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Horizontal
Longitudinal load |
43.73 kN |
18.30 mm |
Broke at the
aluminium section and adjacent to weld |
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Rail Member |
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Vertical Nominal
load |
22.59 kN |
80.50 mm |
Broke at the bolt
hole |
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Horizontal
transverse load |
23.86 kN |
89.50 mm |
Broke at the
aluminium section |
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Splice Member |
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Vertical Nominal
load |
21.36 kN |
115.80 mm |
Localised
deformation at max. load |
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Horizontal
transverse load |
25.89 kN |
63.70 mm |
Broke at the
aluminium section |
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The
full-scale dynamic load test in progress with a 1.5 tons car travelling at a
speed of 116 km/h and a 20 degree angle of impact on P1 (3 rail type) at MIRA
(Motor Industry Research Association) United Kingdom |
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Dynamic Load Test Result
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Post No. |
Bottom Rail Rearward |
Bottom Rail Vertical |
Middle Rail Rearward |
Middle Rail Vertical |
Top Rail Rearward |
Top Rail Vertical |
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3 |
0 mm |
0 mm |
0 mm |
0 mm |
0 mm |
0 mm |
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4 |
100 mm |
40 mm |
150 mm |
40 mm |
225 mm |
40 mm |
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5 |
50 mm |
10 mm |
85 mm |
20 mm |
130 mm |
30 mm |
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6 |
0 mm |
0 mm |
0 mm |
0 mm |
0 mm |
0 mm |
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