DE9308294U1 - Pull-out and removable composite anchor connection - Google Patents

Description

Task

Composite anchors have long been available, consisting of a threaded rod and anchored without expansion by a motel cartridge (equivalent to adhesive mass) in a drill hole of the appropriate size, e.g. in concrete.

This anchoring has the disadvantage that it can become detached if cracks form in the concrete, and secondly, such an anchor can no longer be detached from the anchoring if this should become necessary for any reason (i.e., the anchor cannot be detached).

Solution proposal

To solve these problems, it is proposed that the recesses (equal to dowel holes) be provided with undercuts in their peripheral walls. This can be done in one operation, for example, using a device and a tool (PS 38 10 88 ¹ ^ own invention). It is also proposed that the profile-producing cutting edges be placed at the very front of the tool cutting edges, firstly to avoid having to create an unnecessary borehole lead-in, and secondly to be able to make the area of the coating (e.g. diamond) of the tool cutting edges as short as possible. It is also proposed that, in order to be able to release the dowel (equal to threaded rod) from the anchor, the anchor area be surrounded with a wafer-thin protective layer (e.g. with touch-up paint), which prevents the adhesive from bonding to the threaded rod during the hardening process and thus prevents the threaded rod from being connected in a way that allows it to be unscrewed (equal to detachable connection).

In order to protect this protective layer from excessive wear during the setting process due to the required rotary movements, it is suggested that a hood in the form of a recess in the anchor be placed over this area so that this area does not come into contact with the adhesive. This hood is connected to the threaded rod by a thread (the same as the anchor thread pitch) and is also connected to the hood in the form of a sieve sleeve or the like, which is rigidly connected to the hood, over approximately the entire length in the anchoring area.

These connections can cause the threaded rod to become detached from the protective cover during the unscrewing process.

Description

Figure 1 shows a threaded anchor with protective sleeve
" S " a borehole recess with undercuts

" 3 " a tool for creating a back cut in one operation

¹¹ h " a threaded anchor with different thread pitches

" 5 " a duebe! recess with different diameters

The borehole (1) shown in Figure 2 is made with undercuts (S), and this recess is made in the solid material in one operation using a device and a tool from patent PS 38 10 88^ (own invention). The threaded rod (3) intended for insertion into this recess is surrounded in the connection area (^) by a protective layer (5), and this protective layer can consist of, for example, touch-up paint.

The tool (6) shown in Figure 3 is equipped with cutting edges which are, for example, fitted with diamonds (7) in the cutting area. The part (8) which creates the undercut is attached to the front end (9). Furthermore, the tool is hollow (10) for creating larger recesses and has slots (12) in its peripheral opening (11) for the passage of coolant and drilling cuttings and is detachably connected to the tool shaft (140) by a conical connection (13).

The threaded rod (3) shown in Figure 1 has a hole (16) in the front area (15) for receiving the remaining drill core (17) if an iron reinforcement is introduced in this area and the drill recess was created with a hollow milling cutter (10). A key receptacle (19 or 20) is provided at the other end.

A hood (26) acting as a protective cover, which is adapted in its shape to the threaded rod recess (16), is connected to it by a threaded connection (22-23); furthermore, a sieve sleeve (21) is firmly connected to this hood and its length extends over approximately the entire connection area (+).

It can also be provided that the sieve sleeve is connected to the threaded rod at both ends by a threaded connection.

Claims (1)

Felix Leeb To Espat 3 8380 Mettenhausen Pull-out-proof and removable composite anchor connection
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1 ) Pull-out-proof and removable composite anchor connection, where a threaded rod is held in place in a recess of the appropriate diameter by a mortar pad. trone after its hardening after the setting process is connected in a pull-out-proof and detachable manner, characterized in that the bore recess (1) with undercuts (&Xgr;) and the threaded rod (3) in the connection area (4·) is provided with a protective layer <5) which forms a bond with the adhesive (S9) prevented. Pull-out-proof and removable composite anchor connection according to claim 1, characterized in that the undercuts (S) are created using a tool (6) , the cutting edges (§) producing the undercut being attached at the frontmost point (8) and that the undercut (3) runs like a thread (9) to the base of the recess (30). Pull-out-proof and removable composite anchor connection according to claim 1-&Xgr; characterized in that a hood (26) in the form of the recess <l6) of the threaded rod (3) is connected to it by a threaded connection (22-23) and a sieve sleeve (21> which is rigidly connected to this hood extends over the composite area <<+). 4) Pull-out-proof and removable composite anchor connection according to claims 1-3, characterized in that the undercut (2) is only created approximately in the rear half (24), the front half (25) is a smooth circumferential surface with a larger diameter. 5) Pull-out-proof and removable composite anchor connections according to claims 1-4, characterized in that this front half (25) can also have recesses (2). 6) Pull-out-proof and removable composite anchor connections according to claims 1-5, characterized in that the threaded rod (3) in the composite area (4) has a different thread pitch (27) than in the connection area (28) and has a recess <16).