Extrusion anchor and extrusion sleeve assembly

Abstract

The invention belongs to the field of extrusion anchors, and particularly relates to an extrusion anchor and an extrusion sleeve assembly. In order to improve the pull-off pressure of the extrusion anchor, the invention provides the extrusion anchor. The extrusion anchor comprises a steel strand, an extrusion inner sleeve and an extrusion outer sleeve, the extrusion outer sleeve is provided with an inner conical hole, the extrusion inner sleeve is provided with an outer conical surface matched with the inner conical hole, the extrusion inner sleeve is extruded between the steel strand and the extrusion outer sleeve, and crushing teeth on the extrusion inner sleeve are extruded and crushed and are embedded into the steel strand and the extrusion outer sleeve. The invention further provides an extrusion sleeve assembly used before the extrusion anchor is formed. The extrusion sleeve assembly comprises the extrusion inner sleeve and an extrusion outer sleeve. On the basis that the extrusion anchor utilizes a bond anchoring principle, the extrusion inner sleeve and the extrusion outer sleeve form a taper hole and taper wedge structure, so that the pull-off pressure of the extrusion anchor is improved by utilizing a taper hole and taper wedge anchoring principle.

Description

Technical Field

[0001] The invention belongs to the field of extrusion anchors, and in particular relates to an extrusion anchor and an extrusion sleeve assembly. Background Art

[0002] like Figures 1 to 3 As shown, the extrusion anchor includes a steel strand 1, an extrusion outer sleeve 2 and an extrusion inner sleeve 3; the extrusion inner sleeve 3 is a spring-like member made of densely wound steel wires to form densely distributed crushing teeth 3-1; the extrusion outer sleeve 2 has a cylindrical inner hole, the extrusion inner sleeve 3 is extruded between the steel strand 1 and the extrusion outer sleeve 2, and the crushing teeth 3-1 are extruded and crushed and embedded in the steel strand 1 and the extrusion outer sleeve 2.

[0003] When producing an extruded anchor, first, the extruded inner sleeve 3 and the extruded outer sleeve 2 are both put on the steel strand 1, and ensure that the extruded inner sleeve 3 is located between the extruded outer sleeve 2 and the steel strand 1; then, the extruded anchor is formed by using an anchor extrusion machine. Specifically, the extruded outer sleeve 3, the extruded inner sleeve and the steel strand 1 are passed through a forming hole whose inner diameter is smaller than the outer diameter of the extruded outer sleeve 3, so that the crushing teeth 3-1 are crushed by force and embedded in the steel strand 1 and the extruded outer sleeve 2.

[0004] Among them, the extrusion outer sleeve 2 and the extrusion inner sleeve 3 together constitute an extrusion sleeve assembly; the specific structure of the anchor extruder can refer to the Chinese utility model patent with authorization announcement number CN213033273U and authorization announcement date 2021.04.23; the principle of increasing the pull-out pressure of the extrusion anchor by breaking the crushing teeth 3-1 is the gripping anchoring principle.

[0005] The above-mentioned extrusion anchor only adopts the gripping anchoring principle, resulting in that the pull-out pressure of the extrusion anchor is still relatively low. Therefore, a kind of extrusion anchor with a relatively high pull-out pressure is continuously proposed in the prior art. Summary of the invention

[0006] The object of the present invention is to provide a squeeze anchor to solve the technical problem of low pull-off pressure of the existing squeeze anchor.

[0007] The present invention also aims to provide an extrusion sleeve assembly for cooperating with a steel strand to solve the technical problem of low pull-out pressure of the extrusion anchor.

[0008] To achieve the above purpose, the technical solution of the squeeze anchor provided by the present invention is: An extrusion anchor comprises a steel strand, an extrusion inner sleeve and an extrusion outer sleeve. The extrusion outer sleeve has an inner tapered hole, and the extrusion inner sleeve has an outer tapered surface matching the inner tapered hole. The extrusion inner sleeve is extruded between the steel strand and the extrusion outer sleeve, and the crushing teeth on the extrusion inner sleeve are crushed by extrusion and embedded in the steel strand and the extrusion outer sleeve.

[0009] Furthermore, in the axial direction of the inner tapered hole, two ends of the extruded inner sleeve are flush with two ends of the extruded outer sleeve.

[0010] Furthermore, the extruded inner sleeve also includes an inner cylindrical hole for the steel strand to pass through, and threads are processed on the hole wall and the outer conical surface of the inner cylindrical hole, and the teeth of the threads constitute the crushing teeth.

[0011] Furthermore, the height of the teeth is not greater than 0.5 mm.

[0012] Furthermore, the height of the teeth on the hole wall of the inner cylindrical hole is greater than the height of the teeth on the outer conical surface.

[0013] The beneficial effect of the extruded anchor of the present invention is that the present invention is an invention with changed elements. The core difference between the present invention and the prior art is that in the prior art, the inner hole of the extruded outer sleeve is a cylindrical hole, and the extruded inner sleeve has a cylindrical surface matching therewith, while in the present invention, the inner hole of the extruded outer sleeve is an inner conical hole, and the extruded inner sleeve has an outer conical surface matching therewith. Compared with the prior art, the present invention changes the shapes of the following two elements: (1) the inner hole of the extruded outer sleeve; (2) the surface of the extruded inner sleeve matching the inner hole of the extruded outer sleeve.

[0014] In actual use, on the basis of the gripping anchoring principle of the squeeze anchor, the squeeze inner sleeve and the squeeze outer sleeve form a tapered hole and tapered wedge structure, so as to utilize the tapered hole and tapered wedge anchoring principle to improve the pull-off pressure of the squeeze anchor. Therefore, compared with the prior art, the squeeze anchor in the present invention utilizes both the gripping anchoring principle and the tapered hole and tapered wedge anchoring principle, so that the squeeze anchor in the present invention has a higher pull-off pressure.

[0015] To achieve the above purpose, the technical solution of the extrusion sleeve assembly provided by the present invention is: An extrusion sleeve assembly comprises an extrusion inner sleeve and an extrusion outer sleeve, wherein the extrusion outer sleeve has an inner tapered hole, the extrusion inner sleeve has an outer tapered surface matching the inner tapered hole and an inner cylindrical hole for allowing a steel strand to pass through, and the extrusion inner sleeve also comprises crushing teeth arranged on the outer tapered surface and the hole wall of the inner cylindrical hole, wherein the crushing teeth are used to crush and embed the steel strand and the extrusion outer sleeve during extrusion forming of the extrusion anchor.

[0016] Furthermore, in the axial direction of the inner tapered hole, the length of the extruded inner sleeve is greater than the length of the extruded outer sleeve, and the lengths of the extruded inner sleeve and the extruded outer sleeve satisfy: after the extruded inner sleeve and the extruded outer sleeve are extruded and deformed, the two ends of the extruded inner sleeve are flush with the two ends of the extruded outer sleeve.

[0017] Furthermore, threads are processed on the hole wall of the inner cylindrical hole and the outer conical surface, and the teeth of the threads constitute the crushing teeth.

[0018] Furthermore, the height of the teeth is not greater than 0.5 mm.

[0019] Furthermore, the height of the teeth on the hole wall of the inner cylindrical hole is greater than the height of the teeth on the outer conical surface.

[0020] The beneficial effect of the extrusion sleeve assembly of the present invention is that the present invention is an invention with changed elements. The core difference between the present invention and the prior art is that in the prior art, the inner hole of the extrusion outer sleeve is a cylindrical hole, and the extrusion inner sleeve has a cylindrical surface matching therewith, while in the present invention, the inner hole of the extrusion outer sleeve is an inner conical hole, and the extrusion inner sleeve has an outer conical surface matching therewith. Compared with the prior art, the present invention changes the shapes of the following two elements: (1) the inner hole of the extrusion outer sleeve; (2) the surface of the extrusion inner sleeve matching the inner hole of the extrusion outer sleeve.

[0021] After the extrusion sleeve assembly and the steel strand are processed into an extrusion sleeve together, in the actual use of the extrusion sleeve, on the basis of the gripping anchoring principle of the extrusion anchor, the extrusion inner sleeve and the extrusion outer sleeve form a tapered hole and tapered wedge structure to improve the pull-out pressure of the extrusion anchor by using the tapered hole and tapered wedge anchoring principle. Therefore, compared with the prior art, the extrusion anchor in the present invention uses both the gripping anchoring principle and the tapered hole and tapered wedge anchoring principle, so that the extrusion anchor in the present invention has a higher pull-out pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the main view of the existing extrusion anchor; Figure 2 It is a schematic diagram of the main view of the extruded inner sleeve in the existing extruded anchor; Figure 3 It is a left side schematic diagram of an extruded inner sleeve in a conventional extruded anchor; Figure 4 It is a front view schematic diagram of the extrusion anchor of the present invention; Figure 5 is a cross-sectional schematic diagram of the extruded anchor of the present invention before being extruded (the crushing teeth on the outer cone surface are not shown); Figure 6 for Figure 5 Schematic diagram of the structure of the extruded inner sleeve and the extruded outer sleeve before being extruded (the crushing teeth on the outer cone surface are not shown); Figure 7 for Figure 6 Schematic diagram of the structure of the middle extrusion inner sleeve (the crushing teeth on the outer cone surface are not shown); Figure 8 for Figure 6 Schematic diagram of the structure of the extruded jacket.

[0023] Description of reference numerals: 1. Steel strand; 2. Extruded outer sleeve; 2-1. Inner tapered hole; 2-2. Cylindrical surface; 3. Extruded inner sleeve; 3-1. Crushing teeth; 3-2. Outer tapered surface. DETAILED DESCRIPTION

[0024] To solve the problems in the background technology, the core inventive concept of the present invention is: based on the gripping anchoring principle of the extrusion anchor, the extrusion inner sleeve and the extrusion outer sleeve form a tapered hole and tapered wedge structure to utilize the tapered hole and tapered wedge anchoring principle to increase the pull-off pressure of the extrusion anchor.

[0025] The present invention is further described in detail below in conjunction with embodiments.

[0026] Specific embodiments of the squeeze anchor provided by the present invention: like Figures 4 to 8 As shown, the extruded anchor includes a steel strand 1, an extruded inner sleeve 3 and an extruded outer sleeve 2, the extruded outer sleeve 2 has an inner tapered hole 2-1, the extruded inner sleeve 3 has an outer tapered surface 3-2 matching the inner tapered hole 2-1, the extruded inner sleeve 3 is extruded between the steel strand 1 and the extruded outer sleeve 2, and the crushing teeth 3-1 on the extruded inner sleeve 3 are crushed by extrusion and embedded in the steel strand 1 and the extruded outer sleeve 2.

[0027] Preferably, as in the prior art, the outer peripheral surface of the extrusion jacket 2 is a cylindrical surface 2 - 2 , so that the extrusion anchor can be manufactured using an existing anchor extrusion machine.

[0028] like Figures 4 to 8 As shown, in actual manufacturing, first, the extruded inner sleeve 3 and the extruded outer sleeve 2 are both put on the steel strand 1 (the unextruded extruded inner sleeve 3 and the extruded outer sleeve 2 constitute an extruded sleeve assembly), and ensure that the extruded inner sleeve 3 is located between the extruded outer sleeve 2 and the steel strand 1; then, the extruded anchor is formed by an anchor extrusion machine, specifically, the extruded outer sleeve 2, the extruded inner sleeve 3 and the steel strand 1 are passed through a forming hole whose inner diameter is smaller than the outer diameter of the extruded outer sleeve 2, so that the crushing teeth 3-1 are crushed by force and embedded in the steel strand 1 and the extruded outer sleeve 2.

[0029] It should be noted that when the extruded outer sleeve 2, the extruded inner sleeve 3 and the steel strand 1 pass through the forming hole together, the small end of the inner tapered hole 2-1 (the small end of the outer tapered surface 3-2) can enter the forming hole first to better prevent the extruded outer sleeve 2 from separating from the extruded inner sleeve 3 during forming.

[0030] from Figures 4 to 6 It can be seen that, similar to the prior art, when the extruded anchor is extruded, both the extruded inner sleeve 3 and the extruded outer sleeve 2 are deformed. It is worth mentioning that the axial length of the extruded outer sleeve 2 is significantly longer, and the outer diameter of the extruded outer sleeve 2 is significantly smaller, while the axial deformation of the extruded inner sleeve 3 is not as large as that of the extruded outer sleeve 2.

[0031] As a preferred specific implementation, after the extrusion anchor is formed, in the axial direction of the inner tapered hole 2-1, the two ends of the extruded inner sleeve 3 are flush with the two ends of the extruded outer sleeve 2, so that there is a larger extrusion area between the extruded inner sleeve 3 and the extruded outer sleeve 2, thereby increasing the pull-off pressure of the extrusion anchor.

[0032] It should be noted that before the extruded inner sleeve 3 and the extruded outer sleeve 2 are extruded (i.e., before the extruded sleeve assembly is extruded), in the axial direction of the inner tapered hole 2-1, the length of the extruded inner sleeve 3 is greater than the length of the extruded outer sleeve 2. When the extruded anchor is extruded, due to the large axial deformation of the extruded outer sleeve 2, the two ends of the extruded outer sleeve 2 can be flush with the two ends of the extruded inner sleeve 3 (i.e., the axial length of the extruded outer sleeve 2 is equal to the axial length of the extruded inner sleeve 3).

[0033] In other specific embodiments, before the extrusion sleeve assembly is extruded, the axial length of the extruded inner sleeve 3 is greater than the axial length of the extruded outer sleeve 2. When the axial length of the extruded inner sleeve 3 is shorter, after the extrusion anchor is formed, the two ends of the extruded outer sleeve 2 protrude from the two ends of the extruded inner sleeve 3. When the axial length of the extruded inner sleeve 3 is longer, after the extrusion anchor is formed, the two ends of the extruded inner sleeve 3 protrude from the two ends of the extruded outer sleeve 2. No further details are given here.

[0034] In the present invention, since the extruded inner sleeve 3 has an outer conical surface 3-2, it is impossible to use steel wire to tightly wind the extruded inner sleeve 3 as in the prior art. Therefore, in order to facilitate the processing of the crushing teeth 3-1, as a preferred specific embodiment, the extruded inner sleeve 3 also includes an inner cylindrical hole for the steel strand 1 to pass through, and the hole wall and the outer conical surface 3-2 of the inner cylindrical hole are both processed with threads, and the teeth of the threads constitute the crushing teeth 3-1.

[0035] In other specific embodiments, the inner sleeve 3 can be integrally cast and extruded by casting. At this time, in the axial direction of the inner cylindrical hole, a plurality of annular protrusions are arranged at intervals on the hole wall of the inner cylindrical hole, and a plurality of annular protrusions are arranged at intervals on the outer conical surface 3-2, and the annular protrusions constitute the crushing teeth 3-1.

[0036] In other specific embodiments, the crushing teeth 3 - 1 may also be a plurality of strip-shaped protrusions on the hole wall of the inner cylindrical hole or the outer conical surface 3 - 2 , and the strip-shaped protrusions constitute the crushing teeth 3 - 1 .

[0037] The specific shape of the crushing teeth 3 - 1 is not limited in the present invention, as long as the crushing teeth 3 - 1 can be crushed and embedded in the steel strand 1 and the extrusion jacket 2 when the extrusion anchor is extruded.

[0038] As a preferred specific implementation, the height of the teeth is not greater than 0.5 mm, and can be specifically 0.1 mm, 0.3 mm or 0.5 mm, etc., to ensure that the hole wall of the inner cone hole 2-1 and the outer cone surface 3-2 are fully in contact after the teeth are broken, and the hole wall of the inner cylindrical hole is fully in contact with the steel strand 1. At the same time, the extrusion pressure on the extrusion jacket 2 is small, that is, the output extrusion pressure requirement of the anchor extruder is low, which is convenient for processing and manufacturing the extrusion anchor.

[0039] In other specific embodiments, the height of the teeth can also be 0.6 mm. In this case, a larger extrusion force needs to be applied to the extrusion sleeve 2 to ensure that the hole wall of the inner tapered hole 2-1 and the outer tapered surface 3-2 are in full contact, and the hole wall of the inner cylindrical hole is in full contact with the steel strand 1 after the teeth are broken.

[0040] Since the squeeze anchor of the present invention also adopts the cone hole cone wedge anchoring principle, the squeeze inner sleeve 3 and the squeeze outer sleeve 2 are not easy to be separated, while the squeeze inner sleeve 3 and the steel strand 1 are easy to be separated. As a preferred specific embodiment, the tooth height on the hole wall of the inner cylindrical hole is greater than the tooth height on the outer cone surface 3-2. At this time, the tooth height on the hole wall of the inner cylindrical hole is higher, which can increase the depth of the crushing tooth 3-1 embedded in the steel strand 1 after crushing, thereby further improving the pull-off pressure of the squeeze anchor.

[0041] In other specific embodiments, the tooth height on the hole wall of the inner cylindrical hole may also be slightly less than or equal to the tooth height on the outer conical surface 3 - 2 .

[0042] Specific embodiments of the extrusion sleeve assembly provided by the present invention: Reference Figures 4 to 8 As shown, the extrusion sleeve assembly includes an unextruded extrusion inner sleeve 3 and an extrusion outer sleeve 2. When manufacturing an extrusion anchor, the extrusion sleeve assembly is sleeved on the steel strand 1, and then processed using an anchor extrusion machine. The extrusion sleeve assembly is any one of the extrusion sleeve assemblies in the specific embodiments of the extrusion anchor of the present invention, and will not be described in detail here.

[0043] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein, or organically combine different specific implementations to combine the specific implementations given in the accompanying drawings. Of course, those skilled in the art can also combine the specific implementations not given in the other drawings of the specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A squeeze anchor, characterized in that: The invention comprises a steel strand, an extruded inner sleeve and an extruded outer sleeve. The extruded outer sleeve has an inner conical hole, and the extruded inner sleeve has an outer conical surface matching the inner conical hole. The extruded inner sleeve is extruded between the steel strand and the extruded outer sleeve, and the crushing teeth on the extruded inner sleeve are crushed by extrusion and embedded in the steel strand and the extruded outer sleeve.

2. The squeeze anchor according to claim 1, characterized in that: In the axial direction of the inner tapered hole, two ends of the extruded inner sleeve are flush with two ends of the extruded outer sleeve.

3. The squeeze anchor according to claim 1 or 2, characterized in that: The extruded inner sleeve also includes an inner cylindrical hole for the steel strand to pass through, and threads are processed on the hole wall and the outer cone surface of the inner cylindrical hole, and the teeth of the threads constitute the crushing teeth.

4. The squeeze anchor according to claim 3, characterized in that: The height of the teeth is no more than 0.5 mm.

5. The squeeze anchor according to claim 3, characterized in that: The tooth height on the hole wall of the inner cylindrical hole is greater than the tooth height on the outer cone surface.

6. An extrusion sleeve assembly, characterized in that: The extruded outer sleeve comprises an extruded inner sleeve and an extruded outer sleeve. The extruded outer sleeve has an inner tapered hole. The extruded inner sleeve has an outer tapered surface matching the inner tapered hole and an inner cylindrical hole for passing the steel strand. The extruded inner sleeve also comprises crushing teeth arranged on the outer tapered surface and the hole wall of the inner cylindrical hole. The crushing teeth are used to crush and embed the steel strand and the extruded outer sleeve when the extruded anchor is extruded.

7. The extrusion sleeve assembly according to claim 6, characterized in that In the axial direction of the inner tapered hole, the length of the extruded inner sleeve is greater than that of the extruded outer sleeve, and the lengths of the extruded inner sleeve and the extruded outer sleeve satisfy that after the extruded inner sleeve and the extruded outer sleeve are extruded and deformed, two ends of the extruded inner sleeve and two ends of the extruded outer sleeve are flush.

8. The extrusion sleeve assembly according to claim 6 or 7, characterized in that: The hole wall of the inner cylindrical hole and the outer conical surface are processed with threads, and the teeth of the threads constitute the crushing teeth.

9. The extrusion sleeve assembly according to claim 8, characterized in that The height of the teeth is no more than 0.5 mm.

10. The extrusion sleeve assembly according to claim 6 or 7, characterized in that: The tooth height on the hole wall of the inner cylindrical hole is greater than the tooth height on the outer cone surface.

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