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CN-121993474-A - Expansion anchor with wide annular groove on expansion sleeve

CN121993474ACN 121993474 ACN121993474 ACN 121993474ACN-121993474-A

Abstract

The invention relates to an expansion anchor comprising an anchor bolt and an expansion sleeve surrounding the anchor bolt, an expansion body for the expansion sleeve being arranged on the anchor bolt, the expansion body being arranged at least partially in front of the expansion sleeve, and the expansion sleeve having a first annular groove on its outer face lying in the front region of the expansion sleeve, the first annular groove having a front side and a rear side. According to the invention, the following conditions apply to the width w 61 ：w 61 >0.6*d 60 /tanα max of the rear side of the first annular groove in at least one radial plane, where d 60 is the depth of the first annular groove in the at least one radial plane and α max is the maximum inclination angle of the expansion body in the at least one radial plane.

Inventors

  • K. Harisler
  • M. Florence Meyer
  • SHIMAHARA HIDEKI
  • LI YIJUN
  • A. Guevara Ariola
  • YAN WENTAO

Assignees

  • 喜利得股份公司

Dates

Publication Date
20260508
Application Date
20181114
Priority Date
20171218

Claims (9)

  1. 1. An expansion anchor comprising an anchor bolt (20) and an expansion sleeve (10) surrounding the anchor bolt (20), an expansion body (26) for the expansion sleeve (10) arranged on the anchor bolt (20), which expansion body is arranged at least partially in front of the expansion sleeve (10), and the expansion sleeve (10) has a first annular groove (60) on its outer face lying in the front region of the expansion sleeve (10), the first annular groove (60) having a front side (62) and a rear side (61), It is characterized in that the method comprises the steps of, In at least one radial plane, the following conditions apply to the width w 61 of the rear side (61) of the first annular groove (60): w 61 > 0.6 * d 60 / tan α max , Wherein d 60 is the depth of the first annular groove (60) in the at least one radial plane, and a max is the maximum angle of inclination of the expansion body (26) in the at least one radial plane, the expansion sleeve (10) having at least one second annular groove (70) on its outside in front of the first annular groove (60), at least in the at least one radial plane, the width (w 70 ) of the second annular groove (70) being smaller than the width (w 60 ) of the first annular groove (60), wherein the expansion sleeve (10) has at least one annular step (80), the annular step (80) opening in front, wherein a first annular projection (67) is formed between the first annular groove (60) and the second annular groove (70), and a second annular projection (78) is formed between the second annular groove (70) and the annular step (80), wherein the first annular projection (67) and the second annular projection (78) are arranged at their apex in at least one radial plane (10) aligned with the first annular groove (60), the inclination angle (β 61 ) of the rear side (61) of the first annular groove (60) and the inclination angle (α 27 ) of the expansion body (26) in the opposite region (27) of the expansion body (26) differ by less than 8 °, i.e. β 61 =α 27 +8 °.
  2. 2. The expansion anchor of claim 1, It is characterized in that the method comprises the steps of, At least in the at least one radial plane, the maximum inclination angle (alpha max ) of the expansion body (26) is greater than 10 °.
  3. 3. The expansion anchor according to any of the preceding claims, It is characterized in that the method comprises the steps of, At least in the at least one radial plane, the width (w 27 ) of the counter region (27) is at least as large as the width (w 61 ) of the rear side (61) of the first annular groove (60).
  4. 4. The expansion anchor according to claim 1 to 2, It is characterized in that the method comprises the steps of, At least in said at least one radial plane, the front side (62) of the first annular groove (60) is steeper than the rear side (61) of the first annular groove (60).
  5. 5. The expansion anchor according to claim 1 to 2, It is characterized in that the method comprises the steps of, At least in the at least one radial plane, the front side (62) of the first annular groove (60) adjoins the rear side (61) of the first annular groove (60).
  6. 6. The expansion anchor according to claim 1 to 2, It is characterized in that the method comprises the steps of, At least in the at least one radial plane, the expansion sleeve (10) has a front bevel (90) on its inner face, and at least a portion of the first annular groove (60) is offset rearward relative to the bevel (90).
  7. 7. The expansion anchor according to claim 1 to 2, It is characterized in that the method comprises the steps of, At least in the at least one radial plane, the depth (d 60 ) of the first annular groove (60) is at least 0.25 times the residual wall thickness (d 10 ) of the expansion sleeve over the first annular groove (60).
  8. 8. The expansion anchor according to claim 1 to 2, It is characterized in that the method comprises the steps of, The anchor bolt (20) has a sleeve stop (22), the sleeve stop (22) limiting an axial displacement of the expansion sleeve (10) away from the expansion body (26).
  9. 9. Use of an expansion anchor according to any one of the preceding claims, wherein the expansion body (26) is inserted into the expansion sleeve (10) until, at least in the at least one radial plane, the expansion sleeve (10) extends to the expansion body (26) at the level of the rear side (61) of the first annular groove (60).

Description

Expansion anchor with wide annular groove on expansion sleeve The present invention is a divisional application of chinese patent application CN 201880072465.4. This patent application claims priority from European patent application EP 17207892.5, the contents of which are incorporated herein by reference. Technical Field The present invention relates to an expansion anchor according to the preamble of claim 1. Such an expansion anchor is provided with an anchor bolt and an expansion sleeve surrounding the anchor bolt, an expansion body for the expansion sleeve being arranged on the anchor bolt, said expansion body being arranged at least partially in front of the expansion sleeve, and the expansion sleeve having a first annular groove on its outer face lying in the front region of the expansion sleeve, said first annular groove having a front side and a rear side. Background The general document CA 2979509 A1 discloses an expansion sleeve for an expansion anchor, which has an annular groove and a forwardly open annular step on its outer face. DE 102004052555 A1 describes an expansion anchor with an expansion sleeve having a reduced wall thickness and a reduced outer dimension on the front edge facing the expansion body. EP 2029900 A2 discloses an expansion anchor having a large number of annular grooves in the expansion sleeve. EP 0308619 A1 describes an expansion anchor with an expansion sleeve having cutting teeth and annular grooves on its outer face. EP 0365475 A2 describes an anchor in which the expansion sleeve has a chamfer on the end face and a first annular groove spaced therefrom. Another expansion anchor is known from DE 2046341 A1, in which an annular step which opens on the end face is provided in the expansion sleeve in order to receive a retaining ring. Disclosure of Invention The object of the present invention is to provide an expansion anchor which is particularly effective and particularly has particularly good load values, while at the same time requiring minimal production costs and having high reliability. According to the invention, the problem is solved by an expansion anchor having the features of claim 1. Preferred embodiments are specified in the dependent claims. The expansion anchor according to the invention is characterized in that in at least one radial plane the following conditions apply to the width w 61 of the rear side of the first annular groove. w61 > 0.6 * d60 / tan αmax, Wherein d 60 is the depth of the first annular groove in the at least one radial plane and a max is the maximum angle of inclination of the expansion body in the at least one radial plane. Preferably w 61 > 0.8 * d60 / tan αmax、w61 > 0.9 * d60 / tan αmax or w 61 > 1.0 * d60 / tan αmax, wherein the latter configuration may be provided, in particular when the expansion body becomes steeper towards its front end. It is considered that the basic concept of the present invention is to design the rear side of the first annular groove to be relatively wide, and the ratio of the width to the depth of the rear side is related to the slope of the expansion body. This makes the rear side of the first annular groove follow the contour of the expansion body particularly well during the expansion process. As a result, the region of the expansion sleeve in front of the first annular groove can be pushed out particularly prominently when extending onto the expansion body. This in turn may allow a particularly good anchoring, preferably by forming at least one undercut and rigidly engaging the undercut, while having a particularly low cost and a particularly efficient expansion sleeve. It has been shown that particularly good load values can be obtained also in case the edge layer of the borehole is damaged. The assembly depth and thus the concrete capacity can also be used particularly well, since the sliding of the expansion sleeve is effectively counteracted. An expansion body as part of an expansion anchor according to the invention is provided for expanding the expansion sleeve. The expansion body converges in particular on its outer face towards the rear, i.e. the outer cross-section of the expansion body increases towards the front. The expansion body may be conical on the outside, at least in the region, and may therefore also be referred to as an expansion cone. If the expansion body is displaced axially towards the rear relative to the expansion sleeve, i.e. if the expansion body is pulled into the expansion body, the expansion body may radially expand the expansion sleeve to be anchored in the borehole. The expansion body is at least partially arranged in front of the expansion sleeve, i.e. at least a part of the expansion body is axially in front of the expansion sleeve. The expansion body is advantageously arranged in the front region of the anchor bolt. The expansion sleeve, the expansion body and/or the anchor bolt are preferably at least partially composed of a metallic material. In particular, the