The platform floor shall be textured metal sheet or similar and shall be rigidly supported.Rest Platforms shall be strong enough to withstand 2kN concentrated load. Rest platforms shall be provided along the climbing ladder with intervals not exceeding 15 meters.The ladder rungs must be able to withstand a concentrated load of 1.5kN.Sharp edges that could lead to injuries should be avoided. The ladder top piece must extend at least 1 meter beyond the top working platform so that a secure access from the ladder to the platform is possible.Construction design should be such that the safety cage is rigid. Ladders shall have a continuous safety cage, constructed of loops separated by not more than 1 meter, and with not less than three vertical back strips.Galvanizing to be at least 610 gram of zinc coating per square meter. Ladder shall not be less than 450 millimetres wide with rungs fixed at not more than 200 mm spacing.The design of the access ladder shall be according to BS 4211. The climbing ladders shall be fixed to either horizontal bracings or legs but should be adjacent to the vertical feeder support.The vertical cable support shall not obstruct the feet of the climbing person therefore the minimum distance from the climbing ladder to the support shall be 0.25 meter.Ĭlimbing ladders (and vertical cable supports) shall be fixed at the nearest leg of the telecommunication lattice tower to the shelter and it should comply with local & international safety standards and specifications with regard to their dimensions, mounting, material, etc. The spacing between feeder support bars shall not exceed 0.8 meter. The vertical feeder supports shall be provided adjacent to the climbing ladder capable of supporting maximum number of feeders for the ultimate system. Vertical Cable Support on GSM Self supporting steel tower.In addition, the cable ladder should be designed, manufactured & installed in such a way that the unsupported length shall not exceed 3 meters in order to avoid bending under the weight of the cables. The distance between the tower & the container is normally kept minimum however the contractor is obliged to provide cable ladder in-between the GSM Self supporting steel tower & container regardless of the distance. If requested by Omantel, the cable ladder shall be covered with a hot dipped galvanized steel cover, (to prevent damage to the cable) suitably fixed to the cable ladder. The cable ladder shall be supported by hot dipped galvanized steel vertical adjustable (telescopic) supports having precast reinforced concrete foundations on the ground with minimum 20cm buried under the ground.
The cable ladder shall be delivered complete with all nuts, bolts, and clamps. The cable ladder profile shall be of shape and size to provide fixing arrangement for standard cable clamps such as Andrew, FEMA, RBS or other acceptable clamps for cable sizes of ½” through 1⅝”. The cable ladder shall be 400mm minimum width with horizontal rungs spaced at 500mm maximum. Steel cable ladders should be delivered & installed between the shelter and tower. The dead weight of antenna mount of each antenna shall be assumed as 15kg.Ī hot dipped galvanized steel cable ladder should be installed between the telecommunication lattice tower and the container or outdoor cabinets to support the coaxial cables. Installation of 2 numbers of 1.8m Diameter microwave dish antennae weighing 75 kg each. Installation of 2 numbers of 1.2m diameter microwave dish antennae weighing 50kg each.
GSM antennae of size 30cm x 2.5m weighing 37kg each. The weight of antenna mount of each antenna shall be assumed as 15 kg.ĥ.1.2 Square telecommunication lattice tower of height 15m and below: Diameter microwave dish antenna weighing 200 kg each. Diameter microwave dish antennae weighing 75 kg each. Installation of 9 numbers of GSM antennae of size 30cm x 2.5m weighing 37kg each. Tower structure Design Specs 5.1 Antenna Loadingĥ.1.1 Square GSM Self supporting steel tower of height 20m and above: