DE7145271U - Expansion anchor - Google Patents

Description

Patent attorneys ₍

DIpI. Ing.C. Wallach

Dipl. Ing. G. Koch December 1, 1971

Dr. T. Haibach 8 Munich 2 Kaufingerttr. 8, Tel. 240275

13 5 * 1 - KAM

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Tox-dowel factory R.W. Heckhausen.KG, 7762 Ludwigshafen / Bodensee. Expansion anchor

The invention relates to an expansion dowel with an Im Durohmeseer after the rear end decreasing screw loops for fastening objects to masonry made of lightweight concrete «e.g. aerated concrete or Pumice stone and similar brickwork.

With such DUbellöehern there is a risk that the cells of the aerated concrete or the like by spreading the dowel. collapse and "the destroyed in this area "<** cells connected to one another expand the borehole wall in an uncontrolled manner, so that anchoring cannot be achieved with certainty. Attempts have been made to counter this (! Assisted by the fact that the anchor was designed as a drive-in anchor and a large part of the cells of the borehole wall was deliberately destroyed when hammering in, in an effort to provide the necessary support force in the enlarged borehole through this expansion of the borehole wall In a known dowel of this type, helical radial webs are provided over the inside of the dowel jacket, which are pointed like an arrow at the rear end of the dowel and are intended to penetrate the borehole wall when the dowel is hammered in and destroy the cells Spreading pressure both when driving in and when screwing in the screw is to be regarded as disadvantageous, especially when a fastening near a corner of the masonry is to be created.

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well then there is a risk that the corner will break away. But not only on wall tokens but also on those provided in the wall surface There is a risk that, as a result of the Sprelzdruoke, a Part of the wall surrounding the borehole wall breaks out.

To avoid this caused by the high spreading force Naohteile are known adhesive anchors with which threaded bolts in drill holes can be set, which are brought into oasbeton masonry are «This prevents the masonry from breaking out, Anyway, the handling is extremely difficult, because after Drilling the hole must be carefully cleaned of the drilling dust, the adhesive must then be sunk into the borehole, finally the anchoring agent must be introduced, care must be taken to ensure that the adhesive is not pumped out of the borehole. In addition, one must wait until the adhesive has set, before a full load is applied «Can earth. Depending on the temperature, this can take several hours

The invention is based on the object of an expansion dowel create that adapts to the properties of lightweight concrete (aerated concrete, pumice, etc.) as much as possible without changing its structure and still has good pull-out values.

According to the invention, this object is achieved in that the dowel consists of a highly elastic DUbelmantel and one in the rear expansion sleeve made of hard plastic inserted into part of the dowel jacket consists. The DUbelmantel can be made of an elastic plastic but also consist of rubber, while the expansion sleeve has a higher strength in the rear part and absohnlt in this rear part ensures a high expansion force without the risk of masonry breaking out. As a rotation lock are Conical ribs known per se are attached to the DUbelmantel as a rotation lock. Inside the dowel jacket has a

centrally arranged, several times offset bore, which can be screwed in the screw is used. The one pushed into the DUbelmantel from behind Expanding sleeve has a support flange and is parallel to the axis Divided slots, with a rotation lock between DUbelmantel and expansion sleeve through a web or several webs is effected, which protrude inside the DUbelmantel and engage in a slot in the expansion sleeve. With the AbstÖlxSÄ that is Screw insert hole divided into several, especially three zones. In the outer zone, only a small amount of pressure is exerted on the masonry when the appropriate screw is screwed in. When the second zone with the smaller drilling diameter is reached, a higher contact pressure is already exerted over the elastic DUbelmantel causes. However, this contact pressure reaches a maximum when screwing the screw into the hard expansion part of the third zone. In this way an increasing Anpreßdruok is achieved, which is rather small at the beginning of the dowel and after At the end of it gets bigger and bigger, so that the pressure is deep in the masonry greatest is't. Instead of <Jc; r gradual training of the Bore can also be a kor, vii mi er borrowed tapered bore are provided.

If the masonry is very porous, there is also the possibility of The soft dowel sleeve is expanded radially by axial tensioning when the screw is screwed in, whereby the expansion body, i.e. the Expansion sleeve, acts as a nut and the flange serves as a counter bearing. By choosing a suitable elastic rubber-like material for the dowel sleeve, perfect anchoring is achieved without destroying the masonry or placing undue stress on it »through the elastic training of the already manufactured slightly spread The dowel sleeve prevents the dowel holes from being sanded out with changing loads, vibrations, etc. as far as possible.

An exemplary embodiment of the invention is described below with reference to the drawing. Zn the drawing show:

Pig. 1 shows a longitudinal section of the anchor according to the invention, Flg. 2 shows a cross section along the line 2-2 according to Flg.l.

The dowel according to the invention consists of a dowel jacket 10 elastic plastic or rubber, the outside of which carries ribs 12 which run conically towards the rear, the screw insert hole 1st graded and has a section 14 of larger diameter, which extends from the insert side to over half the dowel length extends. This is followed by a section 16 of smaller diameter at and the dowel end is provided with a bore section 18 of larger diameter into which an expansion sleeve 20 is made hard plastic is inserted. This expansion sleeve carries an end flange 22, the outer diameter of which the Durohmesser of Dowel jacket and it has «£ Ικ axial slots 24 on. In at least one of these sole seats 24 engages as a rotation protection a web 26, from the inner wall of the DUbelmantels protrudes

The front Böhrüngöäusehnitt 14 forms the first zone * the one only exerts a slight pressure on the masonry. The section forms the second zone in which a greater contact pressure is achieved is, while the section Id with the inserted expansion sleeve forms the third zone. In this expansion sleeve 20 is screwed in the screw cut a thread, so that this expansion sleeve acts as a nut and daduroh an axial bracing of the DUbelmantels 10 can be caused, so that this, as the used elastic material is practically incompressible, radial r.aoh on the outside and with the same surface pressure, i.e. with the same specific pressure, all points of the borehole wall applies.

Claims;

Claims (1)

ft · t 1 I. -5- claims: 1. Expansion anchor for lightweight concrete and similar porous masonry with a screw insert looh that decreases in diameter towards the rear end, gekennzeiohne t characterized in that it consists of a highly elastic dowel jacket (10) and a The expansion sleeve (20) inserted in the rear part of the dowel jacket is made of hard plastic, 2. dowels naoh claim 1,. '> characterized by that the expansion sleeve (20) is inserted non-rotatably into the dowel jacket (10) · '· J. dowel according to claim 1 « thereby gekennzel c h η e t that the expansion sleeve (20) with axially extending slots (24) Is provided. . 4. Dowel according to Claims 2 and J, characterized in that that as protection against rotation, at least one web (26) protruding from the inner wall of the dowel jacket (10) into a slot (24) engages the expansion sleeve. 5. Dowel according to Claims 1 to 4, characterized in that that the expansion sleeve (20) is supported axially with a flange (22) at the rear end of the dowel jacket (10). 6. dowel according to claim 1, daduroh gekennzei without that the DUbelmantel (10) with stepped bore sections (I4, l6, l8) is equipped in such a way that the spreading effect naoh increases rear. 7145211 -ft 2.73 r - · f λ ι ι · j ι ι r r - «» 7. Dowel according to claims 1 to 6, characterized thereby ahnet, that the dowel jacket (10) carries ribs (12) extending outward to the rear.