| 摘要 |
<p>The invention relates to a corrosion-protected self-drilling anchor and an anchor subunit and to a method for the production thereof. A self-drilling anchor according to the invention comprises a number of anchor subunits (A, B), each having a hollow rod element (3), which are connected among each other by configuring an axial bell butt joint into a connected pull and pressure member. The first subunit (A) at the end thereof has a core bit (14), and the subunit (B) at the end thereof is non-rotatably connected to a drilling and injecting device. According to the invention, it is provided that each hollow rod element (3) with the exception of the end sections (3, 3) thereof is surrounded by a cladding pipe (6), and the annular gap between the cladding pipe (6) and hollow rod element (3) is pressed together with a first corrosion protection compound (10). In the region of the bell butt joint, a spigot pipe (12) is tightly connected to the cladding pipes (6) of the two hollow rod elements (3) that are part of the bell butt joint. To this end, the hollow space between the spigot pipe (12) and hollow rod elements (3) is filled with a second corrosion protection compound. A method according to the invention provides for the factory-prefabrication of a number of anchor subunits in order to then drill then into the subsurface at the site of the anchor to be produced and connect them to each other by forming bell butt joints, wherein in the region of the bell butt joint a spigot pipe is tightly connected to the ends of two adjoining cladding pipes and the hollow space between the spigot pipe and hollow rod elements is filled with a second corrosion protection compound. The invention for the first time provides a self-drilling anchor having increased requirements with respect to corrosion protection.</p> |
