| 摘要 |
<p>The column 10, which is primarily for use with road signs, street lighting, telecommunications antennae etc., is adapted to be partially inserted into the ground and comprises a zone of reduced shear strength spaced from its lower end in the region of the column that is to be disposed at or close to ground level. An in-fill plug 19 is located within the column that includes reinforcements so as to retard the collapse of the column in the event of a failure in the column wall. The in-fill may be formed from an elastomeric material within which strands are embedded to increase the in-fills shear strength. The zone of reduced shear strength in the column may be formed from a circumferential array of apertures 18 in the column wall and an access door 16 may be provided in the column wall along with a region of increased wall thickness 17 associated with the door. The in-fill plug may be formed from a foamed polymeric material and the strands may be formed from polypropylene and have an irregular cross-section. A bore may be centrally disposed in the in-fill plug to provide a passage for cabling to pass through.</p> |
