Expansion anchor

Abstract

The invention relates to an expansion anchor (1) comprising a plastic main part (2) having an expansion region  (9) with an expansion body. The expansion anchor (1) additionally has at least one metal expansion element (3). According to the invention, at least one of the longitudinal ends (12, 13) of the expansion element (3) is supported in the main part.

Description

Description Expansion anchor [1] The invention relates to an expansion anchor having the features of the preamble of claim 1. [2] An expansion anchor of the type in question is known from laid-open application DE 10 2014 107 719 A1. Known expansion anchors consist of a main part whose length extends along a longitudinal axis. The main part is made of plastics and comprises an expansion region with a tip as the front end of the expansion anchor and a sleeve body comprising a circumferential collar at the rear end. In the expansion region, two plastics expansion webs extending in parallel in the direction of the longitudinal axis are designed as expansion bodies. To improve the holding force in the event of heat and fire, cylindrical shell-shaped expansion elements made of sheet steel are arranged between the two expansion webs in the circumferential direction and are mounted at their lateral edges in grooves formed along the lateral edges of the expansion webs. Once the expansion anchor has been inserted into a borehole, when an expansion bolt is screwed into a bolt channel of the main part, the two plastics expansion webs as well as the two sheet steel expansion elements are expanded, i.e., pressed outward radially with respect to the longitudinal direction against a borehole wall by the expansion bolt. If the plastics melts when exposed to fire, at least the two steel sheets remain, which give the expansion anchor some residual load-bearing capacity. [3] A disadvantage of known expansion anchors is that the expansion anchor is only suitable for use in solid building materials, such as concrete. If there is no stable borehole wall against which the expansion webs and the expansion elements rest over a large part of their length and against which these are pressed, the longitudinal edges of the steel sheets can move out of the grooves and detach from the main part during the expansion process. The expansion bolt then lacks counter-pressure and cannot be secured against the steel surfaces. [4] The object of the invention is to provide an expansion anchor that has improved expansion behavior and yet retains residual load-bearing capacity after exposure to fire. [5] This problem is solved according to the invention by way of an expansion anchor having the features of claim 1. [6] The expansion anchor according to the invention has a plastics main part and at least one metal expansion element. [7] The main part extends along a longitudinal axis, in particular from an end of the expansion anchor that is at the front in the direction of insertion to a rear end of the expansion anchor. In particular, the main part extends over a length that is longer than the length of the expansion element in the direction of insertion. The direction of insertion is the direction in which the expansion anchor is intended to be inserted into a borehole. Thus, the front end of the expansion anchor is the end that, when it is inserted into a borehole as intended, enters the borehole first. The main part has a kind of anchor tip, particularly at its front end, and a circumferential flange-like collar, particularly at its rear end. The direction of insertion regularly extends in parallel with or in the direction of the longitudinal axis. The longitudinal axis in particular extends through the center of the main part. In the expansion anchor according to the invention, the main part extends, in particular forward and / or backward, at least as far as the metal expansion element. In particular, the main part extends beyond the expansion element in the longitudinal direction; the main part extends further forward and / or further backward than the expansion element. [8] The main part is made of plastics, in particular in one piece, especially using single- or multi-component injection molding. [9] The main part of the expansion anchor according to the invention has an expansion region comprising an expansion body. The expansion region can be expanded by inserting an expansion bolt into an expansion channel. The expansion anchor and the expansion bolt form a fastening set. The expansion body is an element in the expansion region which, when the expansion bolt is inserted or screwed into the expansion channel, is pushed outward away from the longitudinal axis, thereby increasing the outer diameter of the expansion region, i.e., expansion it. If the expansion anchor, after being inserted as intended, is located with its expansion region in a borehole, the expansion region can only expand to a limited extent as far as the borehole wall when the expansion bolt is inserted. As the expansion bolt continues to be inserted, it presses the expansion body against the borehole wall, creating a force fit between the expansion region and the borehole wall that allows forces to be transmitted. This allows, for example, an attachment to be fastened to an anchoring base, such as a wall made of concrete or masonry, using the expansion anchor according to the invention. The expansion body is in particular an expansion web that extends in particular in the longitudinal direction toward the longitudinal axis. The metal expansion element is, similarly to the expansion body, also located in the expansion region and is also expanded by the expansion bolt when this is inserted or screwed into the bolt channel. The expansion element extends in the direction of the longitudinal axis, meaning that at least one of its directional components extends in the direction of the longitudinal axis. In particular, the expansion element is designed as a kind of elongated web whose length extends in the longitudinal direction. 

[10] According to the invention, the metal expansion element is mounted in the main part by means of at least one of its longitudinal ends. This ensures that the expansion element is connected to the main part, but can expand freely and independently of the main part, and in particular independently of the expansion body. This allows the expansion behavior of the expansion element to be adapted to match different building materials. For example, it can be designed in such a way that it buckles or twists in a cavity, while still being mounted in the main part. Furthermore, due to the metal expansion element, the expansion anchor according to the invention can still exhibit some residual load-bearing capacity after exposure to fire. 

[11] In embodiments of the expansion anchor according to the invention, the expansion element is mounted in the main part at only one of its longitudinal ends. However, in other embodiments of the expansion anchor according to the invention, it may be preferable that the at least one expansion element is only mounted in the main part at its two longitudinal ends, i.e., at the front and rear. The way in which it is mounted is chosen on the basis of the intended use of the expansion anchor and the desired expansion behavior. 

[12] The term "longitudinal end" here refers not only to the outermost point of the expansion element in the longitudinal direction, but to a region, in particular a short end portion, at a longitudinal end. The end portion extends over a maximum of 20 percent, in particular over a maximum of 15 percent, in particular over a maximum of 10 percent, of the length of the expansion element in the direction of insertion. In particular, the expansion element is not mounted on the main part in a central portion of its longitudinal extension in such a way that the main part would hinder the movement of this central portion of the expansion element when said element expands outward. 

[13] By mounting the expansion element at at least one of its longitudinal ends, it is ensured that at least portions of the length of the expansion element can move independently of the expansion body as said element expands. Preferably, the expansion element is mounted in such a way that it can move outward, away from the longitudinal axis, relative to and independently of the expansion body. 

[14] The term "mounted in the main part" means that the expansion element engages in the main part by means of at least one of its longitudinal ends and is, in particular, fastened in the main part. The expansion element spatially engages in the main part. In particular, the longitudinal end enters the main part radially with respect to the longitudinal axis. The longitudinal end is held in the main part, in particular interlockingly, with individual degrees of freedom being possible. In particular, the expansion element is held in the main part by its longitudinal end so as to be axially fixed. In particular, the expansion element is held in the main part by its longitudinal end so as to be fixed in the circumferential direction. The expansion element can, for example, be held so as to be axially displaceable, i.e., movable in the direction of insertion, for example in a type of axial sliding guide. In addition, the expansion element can be clamped in the main part by its longitudinal end so that it is bent during a movement radially away from the longitudinal axis. The metal expansion element thus rests with at least one of its longitudinal ends not only on the outside of the plastics main part, but at least a part or parts of at least one of the longitudinal ends project inward into the main part, in particular by at least 20 percent, in particular by at least 25 percent, of the diameter of the main part at the point of engagement. In particular, the front and / or rear end face of the expansion element lies in the main part and is in particular enclosed by the main part. For this purpose, the longitudinal end can be completely or only partially surrounded by plastics, for example by overmolding it with plastics. The expansion element can be used as an insert when injection molding main part. Alternatively, the expansion element can be subsequently inserted into the expansion body, for example by clipping it in or sliding it in. 

[15] The expansion element can touch the expansion body, lie flat against it and / or slide along the expansion body as it expands. The expansion element and the expansion body can also be connected to one another by stretchable or breakaway connectors, which represent a kind of transport safety device, but do not prevent the expansion element from moving independently of the expansion body during expansion. 

[16] In particular, less than half of the expansion element is covered by the plastics material both internally and externally so that when it expands, the expansion bolt comes into direct contact with the metal expansion element. This ensures that in the event of a fire, the transmission of force from the borehole wall to the expansion element and from the expansion element to the expansion bolt remains unchanged. 

[17] In the expansion region, the expansion element, together with the expansion body, and in particular with the expansion web, at least partially encloses a expansion channel. In particular, the expansion channel is enclosed in the circumferential direction by a plurality of expansion elements and / or by the expansion body, wherein individual circumferential openings may be present between the expansion element and the expansion body. 

[18] The expansion region of the expansion anchor according to the invention has a length in the direction of insertion that corresponds to at least three times, in particular at least four times, the diameter of the expansion anchor. In particular, the expansion element has a length in the direction of insertion that corresponds to at least three times, and in particular at least four times, the diameter of the expansion anchor. In particular, the expansion element extends over the entire expansion region in the direction of insertion. The expansion element in particular extends in the circumferential direction only over a part, in particular a maximum of one quarter, of the circumference of the expansion anchor. 

[19] The expansion body or a plurality of expansion bodies is / are arranged in the expansion region, with each expansion body being part of the main part and therefore also made of plastics. A main part can, but does not have to, extend over the entire expansion region. It is also possible to arrange a plurality of expansion bodies one behind the other in the longitudinal direction, for example a plurality of teeth that pivot outward independently of one another when the expansion bolt is inserted into the expansion anchor in order to expand it. 

[20] In a preferred embodiment of the expansion anchor according to the invention, the expansion element is an elongated sheet metal strip. The sheet metal strip can be flat or inherently bent. For example, the sheet metal strip can be bent so as to have a C- or L-shape cross section. The sheet metal strip is, in particular, several times longer in the direction of insertion than it is wide in the circumferential direction, and wider in the circumferential direction than its sheet thickness. The sheet metal strip is, in particular, at least five times as long as it is wide, and at least twice as wide as it is thick. In particular, the sheet metal strip is a stamped part that is inexpensive to manufacture. In particular, the sheet metal strip is made of sheet steel. In this embodiment, the engagement in the main part is greater than the sheet thickness, in particular several times greater than, in particular at least twice as great as, in particular at least three times as great as, the sheet thickness. 

[21] Preferably, the expansion element has an angled portion at at least one of its longitudinal ends, which engages in the main part in order to mount it. In particular, the end portion forms the angled portion. In particular, the angled portion is bent radially inward toward the longitudinal axis. This portion preferably has a T-shape, wherein the crossbar of the T does not have to be straight, but can also be curved, for example, and in particular forms the free longitudinal end. Preferably both longitudinal ends of the expansion element are angled and both angled portions are preferably T-shaped. The T-shape is easy and inexpensive to produce, for example by stamping, but ensures the expansion element is permanently interlockingly mounted in the main part. In particular, the crossbar of the T forms a mounting axis around which the portion can pivot. 

[22] Furthermore, it is preferred that the main part has at least two plastics expansion bodies designed as expansion webs, which are connected to one another at at least one of their longitudinal ends. The expansion webs are in particular elongated and have a length that is at least three times their width measured in the circumferential directions. The width in particular at least corresponds to their thickness measured in the radial direction. The longitudinal ends of the expansion webs are connected to one another, particularly in the circumferential direction, in particular by a sleeve-like connecting portion. In their middle portions, the expansion webs are not connected to one another, and therefore they expand independently of one another and also independently of the expansion element. 

[23] In a further preferred embodiment of the expansion anchor according to the invention, the metal expansion element is connected to the main part at least at its rear end such that it cannot rotate in the circumferential direction. This means that the expansion element is mounted in the main part by its rear end in such a way that the end cannot be rotated about the longitudinal axis in the circumferential direction relative to the main part. In particular, the rear end is also axially fixed to the main part. In particular, it is also connected to the main part such that it cannot rotate in the circumferential direction and / or is axially fixed thereto at its front end. 

[24] Preferably, the expansion anchor according to the invention has at least two metal expansion elements that are not connected to one another. The expansion elements are individual parts. In particular, the two individual parts are identical parts, i.e., formed identically, which facilitates the manufacture of the expansion elements and their connection to or assembly on the main part. 

[25] A preferred embodiment of the expansion anchor according to the invention comprises at least two metal expansion elements, which each have a connecting piece at one of their longitudinal ends, by which they are connected to one another in one piece. Preferably, the two expansion elements are connected to one another via the connecting pieces at their front longitudinal ends, preferably in such a way that the connecting pieces form mounting elements for mounting the expansion elements in the main part. The connection between the two expansion elements makes it possible to produce the two expansion elements from metal, for example from a sheet of steel, in one piece, for example by stamping and forming. 

[26] Furthermore, it is preferred that the connecting piece forms a counter bearing, for example a kind of nut, for the expansion bolt, into which the expansion bolt can engage by means of its thread when screwed into the expansion anchor and move the counter bearing from front to back, which supports the expansion of the expansion elements. In particular, this can prevent the expansion elements from buckling and / or knotting together in the expansion region, which means that the expansion anchor according to the invention can also be used in hollow or panel building materials. 

[27] In a preferred embodiment of the expansion anchor according to the invention, the expansion anchor has a plurality of expansion webs and a plurality of expansion elements, wherein the expansion webs are arranged between the expansion elements in circumferential directions. This allows for uniform expansion of the expansion region and for the expansion metal and plastics elements to be distributed across the circumference. 

[28] The features and feature combinations, embodiments, and designs of the invention as mentioned above in the description, as well as the features and feature combinations as mentioned below in the description of figures and / or drawn in a figure, are usable not only in the combination indicated or shown in each case; rather, in principle any other combinations are also usable, or said features can be used individually. Embodiments of the invention are possible which do not have all features of a dependent claim. Individual features of a claim can also be replaced by other disclosed features or feature combinations. Embodiments of the invention which do not have all the features of the exemplary embodiment(s), but rather basically any of the characterized features of an exemplary embodiment, optionally in combination with one, several or all of the features of one or more additional embodiments, are possible. 

[29] The invention will be explained in more detail below on the basis of three embodiments illustrated in the drawings. 

[30] In the drawings:Fig. 1 is a perspective view of a first embodiment of an expansion anchor according to the invention;Fig. 2 shows individual parts of the expansion anchor in Fig. 1;Fig. 3 is a perspective view of a second expansion anchor according to the invention;Fig. 4 is a perspective view of an expansion element of the second expansion anchor according to the invention;Fig. 5 is a section through the expansion anchor according to the invention from Fig. 3 in the plane V-V;Fig. 6 is a section through the expansion anchor according to the invention from Fig. 3 in the plane VI-VI;Fig. 7 is a perspective view of a third embodiment of an expansion anchor according to the invention;Fig. 8 is an axial section of the expansion anchor from Fig. 7; andFig. 9 is a perspective view of a bent sheet metal part comprising expansion elements of the expansion anchor from Fig. 7 and 8 . 

[31] In general, like parts in the figures have the same reference numbers. 

[32] The first expansion anchor 1 according to the invention, shown in Fig. 1 and 2, has a plastics basic body 2 with two elongated expansion webs 11 as expansion bodies 10 and two likewise elongated sheet metal strips 19 as metal expansion elements 3. The two metal expansion elements 3 are individual components that are not connected to one another. The basic body 2 comprises the two expansion webs 11, which are connected at their front ends by a hinge 20. The hinge 20 in the embodiment is formed by two plastics cords 21arranged side by side, which are formed in one piece from plastics with the two expansion webs 11 by injection molding. In the embodiment, the entire main part 2 is formed in one piece from plastics by injection molding. Thus, the plastics expansion webs 11 are connected to one another, in this case at their longitudinal ends. The plastics cords 21 form the front end 7 of the expansion anchor 1, which can also be referred to as the anchor tip, with the expansion anchor 1 being inserted with the anchor tip first, into a borehole in an anchoring base (not shown) in the direction of insertion 6, as intended, in order to anchor it. The expansion anchor 1 extends from its front end 7, along a longitudinal axis 5 extending in parallel with the direction of insertion 6, to a rear end 8 at which a flange-like collar 22 is formed. 

[33] The two plastics expansion webs 11 form a expansion region 9 in which the two metal expansion elements 3 are also arranged. The expansion webs 11 each have a strip-shaped web 23 with a cylindrical outer surface, from the inside of which first teeth 24 protrude on both longitudinal sides of the web 23. The first teeth 24 on both longitudinal sides of the webs 23 are offset with respect to one another in a longitudinal direction of the expansion webs 11. 

[34] The main part 2 of the expansion anchor 1 according to the invention is manufactured with the expansion webs 11 unfolded, i.e., the expansion webs 11 are arranged relative to one another as an extension, as shown in Fig. 2 - in which the individual parts of the expansion anchor 1 are shown - namely the main part 2 with the two expansion webs 11 and the two sheet metal strips 19, which form the metal expansion elements 3. 

[35] The two sheet metal strips 19, which form the metal expansion elements 3 of the expansion anchor 1 according to the invention, have an outwardly flat, strip-shaped yoke 25 which, in the embodiment, has a straight extension in the longitudinal direction of the expansion elements 3, i.e., in parallel with the longitudinal axis 5. The yoke 25 externally forms a flat lateral surface. On both longitudinal sides of the yoke 25, second teeth 26 project inward and are also offset with respect to one another in the longitudinal direction, similarly to the first teeth 24. 

[36] The sheet metal strips 19 are inserted into one of the two unfolded expansion webs 11 in such a way that the second teeth 26 point inward and the yokes 25 are located approximately on a circumference of the expansion anchor 1 or the expansion webs 11. 

[37] The expansion elements 3 each have an angled front portion 14 at their front longitudinal ends 12, which engages in the main part 2 to mount them. The angled front portion 14 is T-shaped and engages in a complementary pocket 28 of the main part 2. At the rear longitudinal ends 13 of the expansion elements 3, the strip-shaped yokes 25 protrude by means of the second teeth 26 and lie in longitudinal grooves 29 that extend in the longitudinal direction in the expansion webs 11. In this way, the sheet metal strips 19 forming the expansion elements 3 are mounted in the main part 2 by their longitudinal ends, and only at these points. In the pockets 28, the front longitudinal ends 12 are axially fixed to the main part 2 and also connected to the main part 2 such that it cannot rotate about the longitudinal axis 5. In contrast, pivoting about the crossbar of the T-shaped front portion 14 and thus expansion outward away from the longitudinal axis 5 is possible. In contrast, at their rear longitudinal ends 13, the expansion elements 3 are held in the longitudinal grooves 29 at the rear, i.e., under pressure, so as to be axially fixed, and secured against rotating, relative to the main part 2 about the longitudinal axis 5, and clamped. 

[38] The two expansion webs 11 are then folded together by pivoting them toward one another in relation to one another at the hinge 20. The collar 22 is integrally arranged on one of the two expansion webs 11, on which collar the other of the expansion webs 11 interlockingly locks in a locking connecting apparatus 27 in order to connect the expansion webs 11 to one another. The expansion anchor 1 is now ready for use. By folding them together, the two expansion elements 3 are captively mounted in the pockets 28 or the longitudinal grooves 29 of the main part 2 of the expansion anchor 1 at both their front longitudinal ends 12 and their rear longitudinal ends 13 by means of a positive fit. 

[39] The two expansion webs 11 are opposite one another with respect to the longitudinal axis 5 and the expansion elements 3 are also arranged opposite one another with respect to the longitudinal axis 5 so that the expansion webs 11 are arranged between the expansion elements 3 in the circumferential direction. 

[40] The two expansion elements 3 and the two expansion webs 11 of the expansion anchor 1 according to the invention are connected to one another only at their longitudinal ends by means of the main part 2 and can easily be pushed outward away from the longitudinal axis 5 along their remaining length, i.e., expand, when an expansion bolt (not shown) is inserted into an expansion channel 30 formed between the expansion webs 11 and the expansion elements 3. Due to being mounted in the main part 2, the expansion elements 3 can move outward relative to and independently of the expansion bodies 10 designed as expansion webs 11 so that the expansion region 9 exhibits very good expansion behavior and can adapt to a wide variety of situations and building materials. 

[41] The second embodiment shown in Fig. 3 to 6 of an expansion anchor 1 according to the invention is similar in construction to the first embodiment described above. In contrast to the first embodiment set out above, the main part 2 of the expansion anchor 1 is manufactured in one piece in a pre-closed state using injection molding, and the two metal expansion elements 3 are laterally inserted into corresponding recesses 31 in the main part 2 radially to the longitudinal axis 5. One of the two expansion elements 3, which are designed as identical individual parts, is shown in detail in Fig. 4. It differs from the expansion element 3 described in the first embodiment only in that the rear longitudinal end 13 is also bent or angled as a portion 15, thus forming an angled rear portion 15. The rear portion 15, similarly to the front portion 14, is also T-shapes; however, in this case the crossbar is curved so that an expansion bolt (not shown) can enter the expansion channel 30 and the crossbar does not obstruct the bolt. Fig. 5 and 6 show how the angled portions 14, 15 engage in undercuts 32 formed in the main part 2 where the angled portions 14, 15 are mounted so as to be axially fixed, and secured against rotating, relative to the main part 2. In contrast, in this case too, the crossbars of the T form line supports that lie in radial planes relative to to the longitudinal axis 5, and about which the expansion elements 3 can pivot when they expand. 

[42] In the third embodiment shown in Fig. 7 to 9 of the expansion anchor 1 according to the invention, the four metal expansion elements 3 in the embodiment each have connecting pieces 16 at their front longitudinal ends 12, with which the expansion elements 3 are connected to one another in one piece. Fig. 9 shows a stamped and bent part consisting of the expansion elements 3 connected in one piece. The expansion elements 3 are connected to one another at their front longitudinal ends 12 by means of the connecting pieces 16. The connecting pieces 16 collectively form a mounting element 17 in the main part 2 of the expansion anchor 1. In this case, the connecting pieces 16 form a counter bearing 18 in the form of a nut with a thread helix 33. As can be seen in Fig. 7, this mounting element 17 lies in the main part 2 of the expansion anchor 1 where it is held by undercuts 32, into which the mounting element 17 interlockingly engages, so as to be secured against rotating and axially fixed relative to the main part 2. The connecting pieces 16, designed as counter bearings 18 and thread helices 33, allow the engagement of an expansion bolt (not shown), which is thereby effectively axially secured in the expansion anchor 1, thus facilitating the expansion of the expansion anchor 1. The rear longitudinal ends 13 of the expansion elements 3 are, as in the first embodiment, mounted in longitudinal grooves 29 in the main part 2. In this embodiment of the expansion anchor 1 according to the invention, two of the four expansion elements 3 lie flat against one another, wherein, in this embodiment too, the plastics expansion webs 11 are arranged between the metal expansion elements 3 in the circumferential direction. 

[43] In all the illustrated embodiments of the expansion anchor 1 according to the invention, the expansion elements 3 are mounted in the main part 2 by their longitudinal ends 12, 13 in such a way that they can move outward relative to, and independently of, the main part 2 in order to expand. In particular, the expansion elements 3 can move relative to, and independently of, the expansion bodies 10, which in the embodiments are formed by expansion webs 11. The expansion anchors 1 according to the invention can therefore be securely anchored with a high holding force in a wide variety of building materials and situations, for example in solid building materials or in perforated bricks, here in the wall region or in cavities behind walls.List of reference signs Expansion dowel 1 Expansion dowel2 Base body3 Expansion element4 Not assigned5 Longitudinal axis6 direction of insertion7 Front end of the expansion dowel 18 Rear end of the expansion dowel 19 Expansion region10 Expansion body11 Expansion web12 Front longitudinal end of the expansion element 313 Rear longitudinal end of the expansion element 314 Front portion15 Rear portion16 Connecting web17 Mounting element18 Counter bearing19 Sheet metal strips20 Hinge21 Plastics cord22 Collar23 Web24 First tooth25 Yoke26 Second tooth27 Connecting apparatus28 Pocket29 Longitudinal groove30 Expansion channel31 Recess32 Undercut33 Thread helix 

Claims

1. An expansion anchor (1),having a plastics main part (2) and at least one metal expansion element (3);the main part (2) extending along a longitudinal axis (5), from an end (7) of the expansion anchor (1) that is at the front in the direction of insertion (6) to a rear end (8) of the expansion anchor (1);the main part (2) having an expansion region (9) having an expansion body (10), comprising an expansion web (11);the metal expansion element (3) being arranged in the expansion region (9) and extending in the direction of the longitudinal axis (5),characterized inthat the metal expansion element (3) is mounted in the main part by means of at least one of its longitudinal ends (12, 13).

2. The expansion anchor (1) according to claim 1, characterized in that the expansion element (3) is mounted in such a way that it can move outward relative to and independently of the expansion body (10).

3. The expansion anchor (1) according to claim 1, characterized in that the expansion element (3) is an elongated sheet metal strip (19).

4. The expansion anchor (1) according to claim 1, characterized in that the expansion element (3) has an angled portion (14, 15) at at least one of its longitudinal ends (12, 13) that engages in the main part (2) in order to mount it.

5. The expansion anchor (1) according to claim 4, characterized in that the angled portion (14, 15) is T-shaped.

6. The expansion anchor (1) according to claim 5, characterized inthat the expansion element (3) has a T-shaped angled portion (14, 15) at its two longitudinal ends (12, 13).

7. The expansion anchor (1) according to claim 1, characterized in that the main part (2) comprises at least two plastics expansion bodies (10) formed as expansion webs (11), which are connected to one another at at least one of their longitudinal ends.

8. The expansion anchor (1) according to claim 1, characterized in that the metal expansion element (3) is secured against rotating relative to the main part (2) in the circumferential direction at least at its rear longitudinal end (13).

9. The expansion anchor (1) according to claim 1, characterized in that the expansion anchor (1) comprises at least two metal expansion elements (3) that are not connected to one another.

10. The expansion anchor (1) according to claim 1, characterized in that the expansion anchor (1) comprises at least two metal expansion elements (3), each of which comprises at least one connecting piece (16) at one of its longitudinal ends (12), by means of which the expansion elements (3) are connected to one another in one piece.

11. The expansion anchor (1) according to claim 10, characterized in that the two expansion elements (3) are connected to one another at their front longitudinal ends (12).

12. The expansion anchor (1) according to claim 10, characterized in that the connecting piece (16) forms a mounting element (17) for mounting the expansion elements (3) in the main part (2).

13. The expansion anchor (1) according to claim 10, characterized in that the connecting piece (16) forms a counter bearing (18) for an expansion bolt.

14. The expansion anchor (1) according to claim 1, characterized in that the at least one expansion element (3) is mounted in the main part (2) at its two longitudinal ends (12, 13).

15. The expansion anchor (1) according to claim 1, characterized in that the expansion anchor (1) comprises a plurality of expansion webs (11) and a plurality of expansion elements (3), and in that the expansion webs (11) are arranged between the expansion elements (3) in the circumferential direction. 

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