Abstract: An anti-twist rod section (10) is disclosed which adapts a survey monument (38) at once to resist rotation and to conveniently accept hardware designed to engage cylindrical rods. The method of using the anti-twist rod section (10) in placing a survey monument (38) is also disclosed. The anti-twist rod section includes an elongated body (12) which may have at least one surface channel (18). At least one fin (20) joined to the body (20) at a junction (22) preferably within the channel (18). The junction (22) is adapted to allow the anti-twist rod section (10) to be driven into the ground with the fins (20) in place such that a portion of the fin (20) resists rotation of the anti-twist section. The junction (22) is also adapted to allow the fins (20) to be severed from the body (12) as they are bent tangentially away from the body (12) such that the anti-twist rod section (10) is left unimpeded by fins. The body of the anti-twist rod section (10) may then accept hardware designed to engage cylindrical rods.

Abstract: 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.