| 摘要 |
A sectionalized, driven-type survey monument (10) is disclosed having at least one cylindrical rod section (11), a penetrating point section (14) attached by a threaded connector (28) seated in bores (26, 27) in the adjacent cylindrical rod section (11) and the point section (14), and an anti-twist rod section (19) attached by a threaded connector (34) to a cylindrical rod section (12). The anti-twist rod section (19) includes a substantially cylindrical body (20) and straight fins (21) which extend radially outward from the cylindrical body over part of the length of the body. The monument is driven into the ground a section at a time, with additional cylindrical rod sections being added to allow the monument to be driven as deeply as desired. Rotation of the penetrating point section as it is driven into the ground, caused by the action of biased turning surfaces (16) on the point section (14), causes the connections between each of the sections in the series to be tightened during driving. The finned anti-twist rod section (19) is usually attached as the last section and, when driven into the ground, resists rotation so as to insure maximum tightening of the connections between the sections in the series. The fins on the anti-twist rod section also prevent this section from being unscrewed and removed by vandals.
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