| 摘要 |
Posts, such as roadside delineators and sign supports are mounted upright from the ground by tubular anchors driven into the ground from their leading ends and having fins on their trailing ends embedded in the ground adjacent the surface thereof. A break-away support tube is secured in the tubular anchor to extend upright therefrom into a rigid but yieldable plastic tube with an elastic memory. The plastic tube carries a reflector, a sign, or the like at a level above ground which will attract the attention of drivers of vehicles on the roadway. The break-away tube is pierced at ground level just above the ground anchor so that when the plastic post is struck by a vehicle, the break-away tube will fracture at ground level permitting the plastic post to be forced to the ground without flying loose from the ground anchor and without springing back to damage the vehicle. The tubular ground anchor can receive an extension tube driven into the ground ahead of the leading end thereof to provide additional anchoring capacity in light soil ground conditions. The lower end of the break-away tube is wedged or clamped in the tubular ground anchor and the lower end of the plastic post is wedged or clamped on the break-away tube. When the break-away tube is fractured by vehicle impact, the entire assembly is reusable to reinstall the post in its upright position by discarding the section of the break-away tube below the fractured level and using the remaining tube length in the anchor and post. If the plastic tube has been bent or indented by the impact blow from the vehicle, it will soon recover its original straight tubular shape due to the elastic memory of the plastic. A new hole is then pierced in the break-away tube at ground level to form another fracture zone for accommodating another impact blow from oncoming traffic. |
