Anchor bolt for casting into precast concrete
By designing anchor bolts with specific anchor heads and anchor rod ratios, the problems of inconvenient operation and insufficient connection strength in the prior art are solved, and efficient fixing and transportation needs of anchor bolts and concrete prefabricated parts are achieved.
Patent Information
- Application Number
- CN202420380614.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-02-28
AI Technical Summary
When transporting concrete prefabricated parts, the fixing and unblocking of the fixing elements is inconvenient, and the connection strength between the anchor bolt and the concrete prefabricated parts is insufficient, making it difficult to meet transportation needs.
Design an anchor bolt whose anchor head partially extends from the concrete prefabricated material in a cast state, with a maximum and minimum head width ratio perpendicular to the longitudinal axis greater than or equal to the anchor diameter, ensuring that the fixing element can be hung from a distance And fasten, the anchor rod and anchor foot are designed to enhance the connection strength.
The fastening and unbuttoning of the fixing elements at the anchor bolt is achieved, which improves the connection strength between the anchor bolt and the concrete prefabricated parts, meets transportation needs, and maintains the compact structure and small size of the anchor bolt.
Smart Images
Figure CN222207289U_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an anchor bolt for casting into a precast concrete part. Background Art
[0002] Such anchors are cast into the precast concrete part so that the precast concrete part can be transported after production. For this purpose, for example, fastening elements of a holding system can be fastened to the anchors in such a way that the precast concrete part can be lifted and transported at one or more anchors using a lifting system, such as a crane or the like.
[0003] Anchors can be used whose anchor heads have mutually opposite flat sides, where the fastening element can be lowered onto the anchor head and can be fastened thereto, for example by rotation. Summary of the invention
[0004] The invention is based on the object of specifying an anchor for casting into a precast concrete part having improved properties.
[0005] This object is achieved by an anchor for casting into a precast concrete part, wherein the anchor has an anchor head which is designed to protrude at least partially from the material of the precast concrete part in the cast state of the anchor and to be gripped from the rear by a fixing element of a holding system for transporting the precast concrete part, wherein the anchor has an anchor shank, wherein the anchor shank has a longitudinal axis, wherein the anchor head is designed in such a way that a fixing element can be fixed to the anchor head, wherein the anchor head has a maximum head width measured perpendicularly to the longitudinal axis, and wherein the anchor head has a minimum head width measured perpendicularly to the longitudinal axis between two flat sides of the anchor head, wherein the minimum head width is greater than or equal to the diameter of the anchor shank.
[0006] By having a minimum head width that is greater than or equal to the diameter of the anchor rod, a good strength of the connection of the anchor head to the anchor rod is achieved.
[0007] The anchor head is designed to protrude at least partially from the material of the precast concrete part in the cast state of the anchor bolt, which means that the anchor head is not completely surrounded by the material of the precast concrete part. The anchor head is accessible from the outside of the precast concrete part, in particular for the fastening element. In this case, however, the anchor head does not have to protrude beyond the outside of the precast concrete part, but can be arranged in a recess in the precast concrete part.
[0008] In particular, at least one flat side protrudes beyond the anchor rod at any position of the flat side in the direction of observation in the direction of the longitudinal axis, wherein the protrusion of the flat side beyond the anchor rod is at least 1 mm. In particular, the protrusion of the flat side beyond the anchor rod is at least 2 mm, in particular at least 3 mm. The protrusion is in particular at least 15 mm, in particular at most 10 mm, in particular at most 7 mm, in particular at most 5 mm. In particular, the protrusion is of the same size on both flat sides.
[0009] In particular, the anchor is designed in such a way that the fastening element can be fastened to the anchor head by a displacement in the direction of the longitudinal axis and by a rotation about the longitudinal axis of the anchor. As a result, the fastening element can also be fastened to the anchor from a distance, for example when the fastening element is suspended from a crane hook. It is not necessary in particular for the fastening and release of the fastening element to the anchor that the operator can reach the fastening element by hand. This makes it possible to easily fasten the fastening element to the anchor and to easily release the fastening element from the anchor.
[0010] The ratio of the minimum head width to the diameter of the anchor rod is in particular greater than 1.1, in particular greater than 1.2, in particular greater than 1.3. This allows a high strength to be achieved at the connection of the anchor head to the anchor rod.
[0011] The ratio of the minimum head width to the diameter of the anchor rod is in particular less than 2.0, in particular at most 1.5. As a result, the opening on the fixing element through which the anchor head can enter the receptacle of the fixing element can be kept relatively small.
[0012] The maximum head width of the anchor head is in particular selected in such a way that a sufficient projection of the anchor head beyond the anchor rod is obtained in order to be able to introduce a good holding force. The ratio of the maximum head width to the diameter of the anchor rod is in particular at least 1.5, in particular at least 1.75. In order to enable a compact design and relatively small dimensions of the fixing element, it can in particular be provided that the ratio of the maximum head width to the diameter of the anchor rod is less than 2.5, in particular at most 2.25. The ratio of the maximum head width to the diameter of the anchor rod is in particular 1.8 to 2.2.
[0013] The diameter of the anchor rod is in particular greater than 12 mm, in particular at least 20 mm, in particular at least 25 mm, in particular at least 30 mm. The diameter of the anchor rod is in particular at most 60 mm, in particular at most 50 mm, in particular at most 40 mm.
[0014] If the anchor rod extends straight, a simple design is obtained. In an alternative design, it is provided in particular that the anchor rod has at least two bends.
[0015] In particular, the length of the anchor bolt is from 100 mm to 2000 mm.
[0016] A simple design is obtained when the anchor head, anchor rod and anchor foot are designed as one piece. The outer diameter of the anchor foot is in particular at least 1.5 times the diameter of the anchor rod. The outer diameter of the anchor foot is in particular up to 5 times the diameter of the anchor rod, in particular up to 3 times, in particular 2.3 to 2.7 times the diameter of the anchor rod. In the case of an anchor foot with an outer shape that deviates from a circular shape, the diameter of the anchor foot is the diameter of the smallest circle in which the anchor foot can be completely arranged, wherein both the anchor foot and the smallest circle are considered in the case of a viewing direction in the direction of the longitudinal axis. In particular, the diameter of the anchor foot is greater than the maximum head width.
[0017] In particular, the anchor foot has a circular shape when viewed in the direction of the longitudinal axis. In particular, the anchor foot has an elliptical shape when viewed in the direction of the longitudinal axis. Alternatively, it is provided that the anchor foot has a polygonal shape when viewed in the direction of the longitudinal axis. The polygonal shape can have roundings at the corners. The rounding can be caused in particular by the production process of the anchor foot. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Embodiments of the present invention are described below with the aid of the accompanying drawings. In which:
[0019] Figure 1 The holding system is shown in a schematic perspective illustration,
[0020] Figure 2 Shows the settings for Figure 1 Embodiments of anchor bolts of the retaining system,
[0021] Figure 3 exist Figure 2 The direction of arrow III in FIG. Figure 2 Anchor bolts,
[0022] Figure 4 exist Figure 3 The direction of the arrow IV in FIG. 1 shows the direction according to Figure 3 Top view of the anchor bolt.
[0023] Figure 5 An alternative embodiment of an anchor bolt is shown,
[0024] Figure 6 Shown in Figure 5 A side view in the direction of arrow VI,
[0025] Figure 7 With Figure 4 The top view corresponding to the illustration in FIG. 1 shows a top view toward an alternative embodiment of the anchor bolt,
[0026] Figure 8 With Figure 4The top view corresponding to the illustration in FIG. 1 shows a top view toward another embodiment of the anchor bolt,
[0027] Fig. 9 A side view of another embodiment of an anchor is shown. DETAILED DESCRIPTION
[0028] The invention relates to an anchor bolt 30 for casting into a precast concrete part 2 , which can be used for transporting the precast concrete part 2 . Figure 1 A holding system 1 is shown, which comprises a fixing element 4 and an anchor bolt 30 cast into a precast concrete part 2. The fixing element 4 can be fastened, for example, to a lifting system, such as a crane or the like. For this purpose, the fixing element 4 has a connecting opening 13, through which, for example, a hook of a crane can be grasped. The fixing element 4 has a plate-shaped base body 18. The base body 18 has two base body end faces 22 arranged opposite to each other. A receptacle 7 for the anchor bolt 30 is configured in the base body 18. In this embodiment, the receptacle 7 extends from one base body end face to the other base body end face 22. The receptacle 7 has a through opening 11, through which the anchor head 31 of the anchor bolt 30 can enter the receptacle 7. The through opening 11 is limited on both sides by a fixing section 8 that grasps the area of the receptacle 7 from the rear.
[0029] Figure 1 The holding system 1 is shown in a released position 41 , in which the fastening element 4 is not fastened to the anchor bolt 30 .
[0030] In this embodiment, an anchor 30 is cast into the precast concrete part 2. The precast concrete part 2 has a top surface 19, which has a recess 5. An anchor head 31 of the anchor 30 is arranged in the recess 5. The anchor head 31 protrudes from the material of the precast concrete part 2 in the recess 5. For transporting the precast concrete part 2, the anchor head 31 can be gripped from the rear by the fastening element 4 of the holding system 1. The anchor head 31 has an end face 36, which can be closed, for example, flush with the top surface 19 of the precast concrete part 2, so that the anchor 30 does not protrude beyond the precast concrete part 2.
[0031] The anchor head 31 has two holding sections 35 arranged opposite one another. The holding sections 35 form a flange behind which the fastening element 4 can be engaged in order to establish a positive connection with the anchor head 30. The holding section 35 is formed by a section of the anchor head 31 which projects radially beyond the anchor rod 32 ( Figure 2). The anchor head 31 has two flat sides 34 lying opposite one another. The anchor head 31 has a minimum head width c measured between the flat sides 34 and perpendicular to the longitudinal axis 28 of the anchor bolt 30. The anchor head 31 has a maximum head width b measured perpendicular to the longitudinal axis 28. Likewise, the maximum head width b is measured perpendicular to the longitudinal axis 28. In this embodiment, the outer side of the holding section 35 is rounded. The contour of the holding section 35 facing away from the end face 36 is convexly curved, in particular in the shape of a cone segment.
[0032] The through opening 11 of the fixing element 4 has a width a. The width a is greater than the minimum head width c of the anchor bolt 30. Thus, the fixing element 4 with the through opening 11 can be pushed over the anchor head 31. The width a of the through opening 11 is less than the maximum head width b of the anchor bolt 30.
[0033] In order to fasten the fixing element 4 to the anchor bolt 30, the fixing element 4 is Figure 1 3 is lowered onto the anchor 30 in the direction of the longitudinal axis 28. The through-opening 11 is oriented in such a way that the width a of the through-opening 11 is parallel to the minimum head width c of the anchor 30. In this direction, the fixing element 4 can be pushed over the anchor 30 so that the anchor head 31 enters the receptacle 7. Subsequently, the fixing element 4 can be rotated about the longitudinal axis 28 in the locking direction indicated by the arrow 16, more precisely, by approximately 90°. The holding system 1 is then in its fixed position. If the fixing element 4 is fastened to the anchor 30, the precast concrete part 2 can be lifted in the lifting direction 14 via the anchor 30. The lifting direction 14 is usually oriented vertically and can extend parallel to the longitudinal axis 28. However, it can also be provided that at least one anchor 30 is embedded in the precast concrete part 2 in such a way that the longitudinal axis 28 is inclined relative to the vertical. In particular, a plurality of anchors 30 are cast in the precast concrete part 2.
[0034] Figures 2 to 4 An embodiment of an anchor bolt 30 is shown in detail. The anchor bolt 30 has an anchor head 31, an anchor rod 32 and, in the embodiment, an anchor foot 33 at the end of the anchor rod 32 remote from the anchor head 31. In particular, the anchor bolt 30 with the anchor head 31, the anchor rod 32 and the anchor foot 33 is manufactured in one piece. The anchor rod 32 has a diameter d. In the embodiment, the anchor rod 32 has a circular cross section. Likewise, cross sections other than a circular shape can be provided. For example Figure 2 As shown, in this embodiment, the two flat sides 34 protrude beyond the anchor rod 32. Figure 4As shown, the flat side 34 protrudes beyond the anchor rod 32 at any position when viewing in the direction of the longitudinal axis 28. When viewing in the direction of the longitudinal axis 28 toward the end face 36 of the anchor head 31, the anchor rod 32 is completely covered by the anchor head 31. The minimum head width c is greater than or equal to the diameter d of the anchor rod 32. In particular, at least one flat side 34, in particular both flat sides 34, protrude beyond the anchor rod 32 at any position when viewing in the direction of the longitudinal axis 28. The protrusion e of at least one flat side 34 over the anchor rod 32 is in particular at least 1 mm, in particular at least 2 mm, in particular at least 3 mm. The protrusion e is in particular at most 15 mm, in particular at most 10 mm, in particular at most 7 mm, in particular at most 5 mm. The protrusion e is in particular the same size on both flat sides 34, so that a symmetrical force transmission and force introduction results.
[0035] The ratio of the minimum head width c to the diameter d of the anchor rod 32 is in particular greater than 1.1, in particular greater than 1.2, in particular greater than 1.3. In particular, the ratio of the minimum head width c to the diameter d of the anchor rod 32 is less than 2.0, in particular at most 1.5.
[0036] like Figure 3 As shown, the maximum head width b is significantly greater than the diameter d of the anchor rod 32. The ratio of the maximum head width b to the diameter d of the anchor rod 32 is in particular at least 1.5, in particular at least 1.75. In particular, the ratio of the maximum head width b to the diameter d of the anchor rod 32 is less than 2.5, in particular at most 2.25. The ratio of the maximum head width b to the diameter d of the anchor rod 32 is in particular 1.8 to 2.2, in particular about 2. It has been found that an excessively small ratio of the maximum head width b to the diameter d of the anchor rod 32 does not allow sufficient force to be introduced into the anchor rod 32 of the prefabricated concrete part 2. If the ratio of the maximum head width b to the diameter d of the anchor rod 32 is selected to be very large, the structural size of the anchor 30 increases and a correspondingly larger embodiment of the fixing element 4 is also required. However, there is no corresponding increase in the force to be transmitted via the anchor 30.
[0037] The diameter d of the anchor rod 32 is in particular greater than 12 mm, in particular greater than 20 mm, in particular greater than 25 mm, in particular greater than 30 mm. The diameter d of the anchor rod 32 is in particular at most 60 mm, in particular at most 50 mm, in particular at most 40 mm.
[0038] like Figure 4As shown, the anchor foot 33 has a circular outer contour in this embodiment when viewed in the direction of the longitudinal axis 28. The anchor foot 33 has a circular outer shape. The diameter f of the anchor foot 33 is greater than the maximum head width b in this embodiment. The outer diameter f of the anchor foot 33 is in particular at least 1.5 times the diameter d of the anchor rod 32. The outer diameter f of the anchor foot 33 is in particular up to 5 times, in particular up to 3 times, in particular 2.3 to 2.7 times the diameter d of the anchor rod 32.
[0039] exist Figures 2 to 4 The anchor bolt 30 shown in FIG. 1 has a length g.
[0040] Figure 5 and Figure 6 An embodiment of an anchor bolt 30 is shown, the length g of which is greater than Figures 2 to 4 The length of the anchor bolt 30. The design of the anchor head 31 and the anchor foot 33 is the same in both embodiments. These embodiments are distinguished by the length g of the anchor rod 32. Figure 5 and Figure 6 In the case of the embodiment of , the greater length of the anchor rod 32 determines the greater length g of the anchor bolt 30 .
[0041] In particular, in all embodiments, the length g of the anchor bolt 30 is from 100 mm to 2000 mm.
[0042] Figures 7 to 9 An embodiment variant for an anchor bolt 30 is shown. Figure 7 In the embodiment of the present invention, the anchor foot 33 does not have a circular but an elliptical shape. Figure 7 In the case of the viewing direction shown in , the anchor foot 33 in this exemplary embodiment projects beyond the anchor head 31 over its entire circumference. In an alternative embodiment, it can be provided that the anchor foot 33 is also partially covered at its outer circumference by the anchor head 31 when viewing in the direction of the longitudinal axis 28. The anchor foot 33 has a diameter d. The diameter d is the diameter of the smallest circle in which the anchor foot 33 can be completely arranged when viewing in the direction of the longitudinal axis 28. Figure 7 The corresponding imaginary circle 37 is drawn with a dotted line.
[0043] The design of the anchor head 31 and the anchor rod 32 corresponds in particular to the one of the preceding exemplary embodiments.
[0044] In accordance with Figure 8In the case of the embodiment of the present invention, the anchor foot 33 has a polygonal, in the embodiment, quadrilateral, outer shape. A different number of corners, for example a triangular, pentagonal or hexagonal design, is also possible. The design of the anchor head 31 and the anchor rod 32 corresponds in particular to the one of the previous embodiments. The diameter d of the anchor foot 33 corresponds to the diameter of the smallest imaginary circle 37 in which the anchor foot 33 can be completely arranged.
[0045] In particular, according to Figure 7 and 8 In the case of an embodiment of the present invention, the outer diameter f of the anchor foot 33 is in particular at least 1.5 times the diameter d of the anchor rod 32. The outer diameter f of the anchor foot 33 is in particular up to 5 times, in particular up to 3 times, in particular 2.3 to 2.7 times the diameter d of the anchor rod 32. The diameter f of the anchor foot 33 is in particular greater than the maximum head width b.
[0046] In accordance with Fig. 9 In the case of the embodiment of the present invention, the anchor rod 32 is designed straight only in the section adjacent to the anchor head 31. The design of the anchor head 31 corresponds to that of the previous embodiment, to which reference is made to its description. For anchoring in the precast concrete part 2, a wavy curved design of the anchor rod 32 is provided as an alternative to the anchor foot 33. The anchor rod 32 has a first bend 38 and a second bend 39, which runs in particular in opposite directions. A different number of bends 38, 39 or a different design may also be provided. Fig. 9 As an alternative to the bends 38 , 39 in the case of the anchor 30 and as an alternative to the anchor foot 33 of a further exemplary embodiment, other embodiments for anchoring the anchor 30 in the concrete of the prefabricated concrete part 2 can also be provided.
Claims
1. An anchor for casting into a precast concrete part (2), comprising an anchor head (31) which is designed to protrude at least partially from the material of the precast concrete part (2) in the cast state of the anchor (30) and to be gripped from behind by a fastening element (4) of a holding system (1) for transporting the precast concrete part (2), wherein: The anchor bolt (30) comprises an anchor shank (32), wherein the anchor shank (32) has a longitudinal axis (28), wherein the anchor head (31) is designed in such a way that the fixing element (4) can be fixed to the anchor head (31), wherein the anchor head (31) has a maximum head width (b) measured perpendicularly to the longitudinal axis (28), and wherein the anchor head (31) has a minimum head width (c) measured perpendicularly to the longitudinal axis (28) between two flat sides (34) of the anchor head (31), It is characterized in that the minimum head width (c) is greater than or equal to the diameter (d) of the anchor rod (32).
2. The anchor bolt according to claim 1, characterized in that: At least one flat side (34) protrudes beyond the anchor rod (32) at any position of the flat side (34) when viewed in the direction of the longitudinal axis (28), wherein the protrusion (e) of the flat side (34) beyond the anchor rod (32) is at least 1 mm.
3. The anchor bolt according to claim 2, characterized in that: The flat side (34) protrudes (e) beyond the anchor rod (32) by at least 2 mm.
4. The anchor bolt according to claim 2, characterized in that: The flat side (34) protrudes (e) beyond the anchor rod (32) by at least 3 mm.
5. The anchor bolt according to claim 1, characterized in that: At least one flat side (34) protrudes beyond the anchor rod (32) at any position when viewed in the direction of the longitudinal axis (28), wherein the protrusion (e) is at most 15 mm.
6. The anchor bolt according to claim 5, characterized in that: The protrusion (e) is at most 10 mm.
7. The anchor bolt according to claim 5, characterized in that: The protrusion (e) is at most 7 mm.
8. The anchor bolt according to claim 5, characterized in that: The protrusion (e) is at most 5 mm.
9. The anchor bolt according to claim 1, characterized in that: At least one flat side (34) protrudes beyond the anchor rod (32) at any position when viewed in the direction of the longitudinal axis (28), wherein the projection (e) is of equal size on both flat sides (34).
10. The anchor bolt according to claim 1, characterized in that The anchor bolt (30) is designed in such a way that the fixing element (4) can be fixed at the anchor head (31) by displacement in the direction of the longitudinal axis (28) and by rotation about the longitudinal axis (28) of the anchor bolt (30).
11. The anchor bolt according to claim 1, characterized in that: The ratio of the minimum head width (c) to the diameter (d) of the anchor rod (32) is greater than 1.
1.
12. The anchor bolt according to claim 1, characterized in that The ratio of the minimum head width (c) to the diameter (d) of the anchor rod (32) is greater than 1.
2.
13. The anchor bolt according to claim 1, characterized in that The ratio of the minimum head width (c) to the diameter (d) of the anchor rod (32) is greater than 1.
3.
14. The anchor bolt according to claim 1, characterized in that The ratio of the minimum head width (c) to the diameter (d) of the anchor rod (32) is less than 2.
0.
15. The anchor bolt according to claim 1, characterized in that The ratio of the minimum head width (c) to the diameter (d) of the anchor rod (32) is at most 1.
5.
16. The anchor bolt according to claim 1, characterized in that The ratio of the maximum head width (b) to the diameter (d) of the anchor rod (32) is at least 1.
5.
17. The anchor bolt according to claim 1, characterized in that The ratio of the maximum head width (b) to the diameter (d) of the anchor rod (32) is at least 1.
75.
18. The anchor bolt according to claim 1, characterized in that The ratio of the maximum head width (b) to the diameter (d) of the anchor rod (32) is less than 2.
5.
19. The anchor bolt according to claim 1, characterized in that The ratio of the maximum head width (b) to the diameter (d) of the anchor rod (32) is at most 2.
25.
20. The anchor bolt according to claim 1, characterized in that The ratio of the maximum head width (b) to the diameter (d) of the anchor rod (32) is 1.8 to 2.
2.
21. The anchor bolt according to claim 1, characterized in that The diameter (d) of the anchor rod (32) is greater than 12 mm.
22. The anchor bolt according to claim 1, characterized in that The diameter (d) of the anchor rod (32) is at least 20 mm.
23. The anchor bolt according to claim 1, characterized in that The diameter (d) of the anchor rod (32) is at least 25 mm.
24. The anchor bolt according to claim 1, characterized in that The diameter (d) of the anchor rod (32) is at least 30 mm.
25. The anchor bolt according to claim 1, characterized in that The diameter (d) of the anchor rod (32) is at most 60 mm.
26. The anchor bolt according to claim 1, characterized in that The diameter (d) of the anchor rod (32) is at most 50 mm.
27. The anchor bolt according to claim 1, characterized in that The diameter (d) of the anchor rod (32) is at most 40 mm.
28. The anchor bolt according to claim 1, characterized in that The anchor rod (32) extends straight.
29. The anchor bolt according to claim 1, characterized in that The anchor rod (32) has at least two bends.
30. The anchor bolt according to claim 1, characterized in that The length (g) of the anchor bolt (30) is 100 mm to 2000 mm.
31. The anchor bolt according to claim 1, characterized in that The anchor bolt (30) has an anchor foot (33) at the end of the anchor rod (32) remote from the anchor head (31).
32. The anchor bolt according to claim 31, characterized in that The anchor head (31), the anchor rod (32) and the anchor foot (33) are designed as a single piece.
33. The anchor bolt according to claim 31, characterized in that The outer diameter (f) of the anchor foot (33) is at least 1.5 times the diameter (d) of the anchor rod (32).
34. The anchor bolt according to claim 31, characterized in that The outer diameter (f) of the anchor foot (33) is at most 5 times the diameter (d) of the anchor rod (32).
35. The anchor bolt according to claim 31, characterized in that The outer diameter (f) of the anchor foot (33) is at most 3 times the diameter (d) of the anchor rod (32).
36. The anchor bolt according to claim 31, characterized in that The outer diameter (f) of the anchor foot (33) is 2.3 to 2.7 times the diameter (d) of the anchor rod (32).
37. The anchor bolt according to claim 31, characterized in that The outer diameter (f) of the anchor foot (33) is greater than the maximum head width (b).
38. The anchor bolt according to claim 31, characterized in that The anchor foot (33) has a circular shape when viewed in the direction of the longitudinal axis (28).
39. The anchor bolt according to claim 31, characterized in that The anchor foot (33) has an elliptical shape when viewed in the direction of the longitudinal axis (28).
40. The anchor bolt according to claim 31, characterized in that The anchor foot (33) has a polygonal shape when viewed in the direction of the longitudinal axis (28).