Static structures (e.g. – buildings) – Assembled in situ-type anchor or tie – With feature engaging form
Patent
1983-01-28
1985-07-16
Kelly, Donald G.
Static structures (e.g., buildings)
Assembled in situ-type anchor or tie
With feature engaging form
52704, E04B 138
Patent
active
045287910
DESCRIPTION:
BRIEF SUMMARY
The invention concerns an anchorage for climbing irons in parts made of concrete or the like with placing parts to be secured on formwork, whereby said climbing irons have to be connected with the placing parts after the removal of the formwork.
An anchorage of this type is described e.g. in the U.S. Pat. No. 3,374,859 where a U-shaped bent round steel bracket is supported at its two ends in two separate placing parts of metal and is secured in the use position by means of a spring plate latch device. Apart from the fact that this type of climbing iron anchorage causes high material costs, is technically very expensive and moreover is relatively insecure, its two separate placing parts are difficult to adjust during assembly on the formwork.
It is therefore the object of the invention to create an anchorage of the type above by means of which the material cost of the placing parts and the wage costs during the installation thereof are substantially reduced as against the known anchorage.
This object is inventively solved in that for each climbing iron with a securing flange and a screw joint, a placing part is provided of a substance with at least the compressive strength of concrete, and that the placing part has a basic body extending parallel to said securing flange, while said basic body, on the side which is visible after the removal of the formwork, has three securing points for the climbing iron, as well as on the opposite concrete side at least one tension-loadable dowel as the top securing point for the screw joint which passes through a borehole, and two supports loadable for pressure and thrust as the further lower securing points. With this anchorage to secure a climbing iron on a concrete wall or the like, on the formwork only a relatively flat placing part is mounted with only small installed depth in the concrete wall, which in contrast to the two placing parts of the known anchorage causes only a fraction of the material and wage costs. In addition the invention placing part can be mounted on a concrete wall with the admissible minimum wall thickness of about 80 to 100 mm, which is not possible when using the two placing parts of the known anchorage.
In the DE-GM 77 12 733 the anchor dowels to be inserted flush in a concrete construction are described for the subsequent fastening of connecting elements. These anchor dowels are, however, exposed to uncontrollable tensional, compressive and thrust loadings. A climbing iron anchor based on this principle, due to the numerous welding points on the placing part and the respectively large number of anchor dowels needed for a climbing iron, would be fairly costly in contrast to the inventive anchorage for climbing irons, and therefore uneconomical when used in large numbers.
Using the inventive anchorage a climbing iron can be secured on a concrete wall as is described e.g. in DE-PS 26 50 180. For this climbing iron in particular one single screw is adequate as a screw joint. For climbing irons which have to be secured on a wall by a plurality of screws, the supports can be correspondingly adapted.
The invention provides that the dowel engages in the basic body of the placing part and is held in the borehole by friction. Thus the anchorage can be assembled even before transportation to the building site. Moreover the dowel does not need to specially secured after mounting of the placing part on the formwork against accidentally falling or sliding out.
An advantageous further development of the invention comprises the fact that the lower securing points on the visible side of the placing part has two recesses as the bearing points for the cams formed on the climbing irons. This design feature facilitates in particular the assembly work of mounting the climbing iron on the finished wall to a substantial extent: after introducing its cams in the relevant recesses of the placing part, the climbing iron only has to be secured by a screw held on its securing flange and then secured in its operating position.
Further it is advantageously provided that on
REFERENCES:
patent: 2785842 (1957-03-01), Phelps
patent: 3374859 (1968-03-01), Dobert
Kelly Donald G.
Slack Naoko N.
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