This type of inspection is well known to us, as are the reporting formats and procedures to be used. (Forms R8 & R9 for technical inspections and Forms R12, R13 & R14 for professional appraisals). The total number of structures inspected for the MOD is in excess of 1,500 structures over the past 5 years.

Typical types of support structure include, but are not limited to:

1.    Timber Towers: MKII, MKIII & MKIV Towers (& variants)

2.    Hybrid Towers: Timber/steel structures (generally manufactured by Balfour Beatty)

3.    Floodlight Towers: Triangular Lattice Steel Towers varying in height from 10m to 45m and located at a number of sites throughout the United Kingdom.

4.    Anemometer Towers: These are generally lattice steel towers either purpose designed, “abacus” lowerable poles or “wec” masts. These structures are similar to those utilised by the Met Office.

5.    Guyed Mast Structures: Typical structures include:

•    LF masts, usually in excess of 183m.

•    AEY & AGV masts (various sites)

•    VLPA masts (Alloy masts at various sites)

•    RLPA masts (Rotating log periodic antenna at various sites)

•    Conifan (various sites)

•    65m high Rosette Antenna’s (Milltown & Chelveston)

•    Monocone Antennas

6    Boxer Towers: Lattice Steel Towers, generally manufactured by Balfour Beatty. They vary in height from 10m to 55m and are located at a number of sites throughout the United Kingdom.

7    Mould Towers : Lattice Steel Towers usually sited on remote sites and usually over 30m in height.

8    UKAEGIS, Link 11: Lattice Steel Towers usually in the range 18 to 45m

9    Watchman Radar towers:     Square Steel Lattice Towers. A variety of types, depending on location and use.

10   ILS Towers : Square or triangular lattice steel structures

11   Abacus Towers : Floodlight and aerial communication structures

12   Timber poles : Large guyed flagpoles and aerial support structures

As part of the professional appraisal process, Royal Haskoning has produced analysis calculations for all of the above structures. Most have been analysed using static techniques to BS 8100, although several of the guyed structures have been analysed utilising dynamic techniques.

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