Squeezing anchor and squeezing sleeve assembly

Abstract

The utility model belongs to the field of extrusion anchors, and particularly relates to an extrusion anchor and an extrusion sleeve assembly. The utility model provides an extrusion anchor in order to improve the pull-off pressure of 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 utility model 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] This utility model belongs to the field of extrusion anchors, and in particular relates to extrusion anchors and extrusion sleeve assemblies. Background Technology

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

[0003] In the production of extruded anchors, firstly, the inner extrusion sleeve 3 and the outer extrusion sleeve 2 are both placed on the steel strand 1, ensuring that the inner extrusion sleeve 3 is located between the outer extrusion sleeve 2 and the steel strand 1; then, the extruded anchor is formed using an anchoring extrusion machine. Specifically, the outer extrusion sleeve 3, the inner extrusion sleeve, and the steel strand 1 are passed together through a forming hole with an inner diameter smaller than the outer diameter of the outer extrusion sleeve 3, so that the crushing tooth 3-1 is subjected to force to break and embed into the steel strand 1 and the outer extrusion sleeve 2.

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

[0005] The aforementioned squeeze anchor only uses the gripping anchoring principle, resulting in a relatively low pull-out pressure. Therefore, the prior art proposes a squeeze anchor with a higher pull-out pressure. Utility Model Content

[0006] The purpose of this invention is to provide a compression anchor to solve the technical problem of low pull-out pressure of existing compression anchors.

[0007] The purpose of this invention is also to provide an extrusion sleeve assembly for use with steel strands to solve the technical problem of low extrusion anchor pull-out pressure.

[0008] To achieve the above objectives, the technical solution for the compression anchor provided by this utility model is as follows:

[0009] The extrusion anchor includes a steel strand, an extrusion inner sleeve, and an extrusion outer sleeve. The extrusion outer sleeve has an inner conical hole, and the extrusion inner sleeve has an outer conical surface that matches the inner conical 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 and embedded in the steel strand and the extrusion outer sleeve.

[0010] Furthermore, along the axial direction of the inner conical hole, the two ends of the extrusion inner sleeve are flush with the two ends of the extrusion outer sleeve.

[0011] Furthermore, the extrusion sleeve also includes an inner cylindrical hole for the steel strand to pass through, and the inner cylindrical hole wall and the outer conical surface are both machined with threads, the teeth of which constitute the breaking teeth.

[0012] Furthermore, the height of the tooth is no greater than 0.5 mm.

[0013] Furthermore, the tooth height on the inner cylindrical hole wall is greater than the tooth height on the outer conical surface.

[0014] The beneficial effects of this utility model extrusion anchor are as follows: This utility model is an invention with changes to its elements. The core difference between this utility model 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 matching cylindrical surface. In this utility model, the inner hole of the extrusion outer sleeve is an inner conical hole, and the extrusion inner sleeve has a matching outer conical surface. This utility model changes the shape of the following two elements compared to the prior art: (1) the inner hole of the extrusion outer sleeve; (2) the surface of the extrusion inner sleeve that mates with the inner hole of the extrusion outer sleeve.

[0015] In practical use, based on the gripping anchoring principle, the inner and outer extrusion sleeves form a conical hole and conical wedge structure to enhance the pull-out pressure of the extrusion anchor by utilizing the conical hole and conical wedge anchoring principle. Therefore, compared with the prior art, the extrusion anchor of this invention utilizes both the gripping anchoring principle and the conical hole and conical wedge anchoring principle, thus giving the extrusion anchor of this invention a higher pull-out pressure.

[0016] To achieve the above objectives, the technical solution of the extrusion sleeve assembly provided by this utility model is as follows:

[0017] An extrusion sleeve assembly includes an inner extrusion sleeve and an outer extrusion sleeve. The outer extrusion sleeve has an inner conical bore, and the inner extrusion sleeve has an outer conical surface that matches the inner conical bore and an inner cylindrical bore for steel strands to pass through. The inner extrusion sleeve also includes breaking teeth disposed on the bore walls of the outer conical surface and the inner cylindrical bore, the breaking teeth being used to break and embed the steel strands and the outer extrusion sleeve during the extrusion of the extrusion anchor.

[0018] Furthermore, in the axial direction of the inner conical hole, the length of the inner extrusion sleeve is greater than the length of the outer extrusion sleeve, and the lengths of the inner extrusion sleeve and the outer extrusion sleeve satisfy the following condition: after the inner extrusion sleeve and the outer extrusion sleeve are extruded and deformed, the two ends of the inner extrusion sleeve and the two ends of the outer extrusion sleeve are flush.

[0019] Furthermore, the inner cylindrical hole wall and the outer conical surface are machined with threads, and the teeth of the threads constitute the breaking teeth.

[0020] Furthermore, the height of the tooth is no greater than 0.5 mm.

[0021] Furthermore, the tooth height on the inner cylindrical hole wall is greater than the tooth height on the outer conical surface.

[0022] The beneficial effects of this utility model extrusion sleeve assembly are as follows: This utility model is an invention with changes to its elements. The core difference between this utility model and the prior art is that in the prior art, the inner hole of the extrusion sleeve is a cylindrical hole, and the extrusion inner sleeve has a matching cylindrical surface, while in this utility model, the inner hole of the extrusion sleeve is an inner conical hole, and the extrusion inner sleeve has a matching outer conical surface. This utility model changes the shape of the following two elements compared to the prior art: (1) the inner hole of the extrusion sleeve; (2) the surface of the extrusion inner sleeve that mates with the inner hole of the extrusion sleeve.

[0023] After the extrusion sleeve assembly and steel strand are processed into an extrusion sleeve, during actual use, based on the gripping anchoring principle, the inner and outer extrusion sleeves form a conical hole and conical wedge structure to enhance the pull-out pressure of the extrusion anchor using the conical hole and conical wedge anchoring principle. Therefore, compared with the prior art, the extrusion anchor in this invention utilizes both the gripping anchoring principle and the conical hole and conical wedge anchoring principle, thus giving the extrusion anchor of this invention a higher pull-out pressure. Attached Figure Description

[0024] Figure 1 This is a front view schematic diagram of an existing compression anchor;

[0025] Figure 2 This is a front view schematic diagram of the extrusion inner sleeve in an existing extrusion anchor;

[0026] Figure 3 This is a left-side schematic diagram of the extrusion inner sleeve in an existing extrusion anchor;

[0027] Figure 4 This is a front view schematic diagram of the extrusion anchor of this utility model;

[0028] Figure 5 This is a cross-sectional view of the extrusion anchor of this utility model before it is extruded (the breaking teeth on the outer conical surface are not shown).

[0029] Figure 6 for Figure 5 A schematic diagram of the structure of the inner and outer extrusion sleeves before extrusion molding (the breaking teeth on the outer cone surface are not shown).

[0030] Figure 7 for Figure 6 A schematic diagram of the structure of the inner sleeve of the extrusion (the breaking teeth on the outer cone surface are not shown).

[0031] Figure 8 for Figure 6 A schematic diagram of the structure of the extruded outer jacket.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Steel strand; 2. Extruded outer sleeve; 2-1. Inner conical hole; 2-2. Cylindrical surface; 3. Extruded inner sleeve; 3-1. Crushing tooth; 3-2. Outer conical surface. Detailed Implementation

[0034] To address the problems in the background technology, the core inventive concept of this utility model is as follows: based on the gripping anchoring principle, the inner and outer extrusion sleeves are made into a conical hole and conical wedge structure to improve the pull-out pressure of the extrusion anchor by utilizing the conical hole and conical wedge anchoring principle.

[0035] The present invention will be further described in detail below with reference to the embodiments.

[0036] Specific embodiments of the compression anchor provided by this utility model:

[0037] like Figures 4-8 As shown, the extrusion anchor includes a steel strand 1, an extrusion inner sleeve 3, and an extrusion outer sleeve 2. The extrusion outer sleeve 2 has an inner conical hole 2-1, and the extrusion inner sleeve 3 has an outer conical surface 3-2 that matches the inner conical hole 2-1. The extrusion inner sleeve 3 is extruded between the steel strand 1 and the extrusion outer sleeve 2, and the crushing teeth 3-1 on the extrusion inner sleeve 3 are crushed and embedded in the steel strand 1 and the extrusion outer sleeve 2.

[0038] Preferably, as in the prior art, the outer peripheral surface of the extrusion jacket 2 is a cylindrical surface 2-2, thereby enabling the manufacture of extrusion anchors using existing anchoring extrusion machines.

[0039] like Figures 4-8 As shown, in actual manufacturing, firstly, the inner extrusion sleeve 3 and the outer extrusion sleeve 2 are both fitted onto the steel strand 1 (the unextruded inner extrusion sleeve 3 and outer extrusion sleeve 2 constitute the extrusion sleeve assembly), and the inner extrusion sleeve 3 is positioned between the outer extrusion sleeve 2 and the steel strand 1; then, the extrusion anchor is formed using an anchoring extrusion machine. Specifically, the outer extrusion sleeve 2, the inner extrusion sleeve 3, and the steel strand 1 are passed together through a forming hole with an inner diameter smaller than the outer diameter of the outer extrusion sleeve 2, so that the crushing tooth 3-1 is subjected to force to crush and embed into the steel strand 1 and the outer extrusion sleeve 2.

[0040] It should be noted that when the extrusion outer sleeve 2, extrusion inner sleeve 3 and steel strand 1 pass through the forming hole together, the small end of the inner conical hole 2-1 (the small end of the outer conical surface 3-2) can enter the forming hole first, so as to better prevent the extrusion outer sleeve 2 from detaching from the extrusion inner sleeve 3 during forming.

[0041] from Figures 4-6As can be seen from the prior art, when the extrusion anchor is extruded, both the inner extrusion sleeve 3 and the outer extrusion sleeve 2 are deformed. It is worth mentioning that the axial length of the outer extrusion sleeve 2 is significantly longer and the outer diameter of the outer extrusion sleeve 2 is significantly smaller, while the axial deformation of the inner extrusion sleeve 3 is not as large as that of the outer extrusion sleeve 2.

[0042] As a preferred embodiment, after the extrusion anchor is formed, the two ends of the extrusion inner sleeve 3 are flush with the two ends of the extrusion outer sleeve 2 in the axial direction of the inner conical hole 2-1, so that there is a large extrusion area between the extrusion inner sleeve 3 and the extrusion outer sleeve 2, thereby increasing the pull-out pressure of the extrusion anchor.

[0043] It should be noted that before the inner sleeve 3 and outer sleeve 2 are extruded (i.e., before the extrusion sleeve assembly is extruded), the length of the inner sleeve 3 is greater than the length of the outer sleeve 2 in the axial direction of the inner conical hole 2-1. When the extrusion anchor is extruded, due to the large axial deformation of the outer sleeve 2, the two ends of the outer sleeve 2 can be flush with the two ends of the inner sleeve 3 (i.e., the axial length of the outer sleeve 2 is equal to the axial length of the inner sleeve 3).

[0044] In other specific embodiments, before the extrusion sleeve assembly is extruded, the axial length of the extrusion inner sleeve 3 is greater than the axial length of the extrusion outer sleeve 2. When the axial length of the extrusion inner sleeve 3 is short, after the extrusion anchor is formed, the two ends of the extrusion outer sleeve 2 protrude beyond the two ends of the extrusion inner sleeve 3. When the axial length of the extrusion inner sleeve 3 is long, after the extrusion anchor is formed, the two ends of the extrusion inner sleeve 3 protrude beyond the two ends of the extrusion outer sleeve 2. This will not be elaborated further here.

[0045] In this utility model, since the extrusion inner sleeve 3 has an outer conical surface 3-2, it is not possible to use steel wire to tightly wind the extrusion inner sleeve 3 as in the prior art. Therefore, in order to facilitate the processing of the crushing tooth 3-1, as a preferred embodiment, the extrusion inner sleeve 3 also includes an inner cylindrical hole for the steel strand 1 to pass through. The hole wall of the inner cylindrical hole and the outer conical surface 3-2 are both processed with threads, and the teeth of the threads constitute the crushing tooth 3-1.

[0046] In other specific embodiments, the inner sleeve 3 can be integrally cast by casting. In this case, multiple annular protrusions are arranged at intervals on the wall of the inner cylindrical hole along the axial direction of the inner cylindrical hole, and multiple annular protrusions are arranged at intervals on the outer conical surface 3-2. The annular protrusions constitute the breaking teeth 3-1.

[0047] In other specific embodiments, the breaking teeth 3-1 may also be multiple strip-shaped protrusions on the wall of the inner cylindrical hole or the outer conical surface 3-2, and the strip-shaped protrusions constitute the breaking teeth 3-1.

[0048] The specific shape of the crushing tooth 3-1 is not limited in this utility model, as long as the crushing tooth 3-1 can be crushed and embedded in the steel strand 1 and the extrusion jacket 2 when the extrusion anchor is extruded and formed.

[0049] In a preferred embodiment, the height of the teeth is no greater than 0.5 mm, specifically 0.1 mm, 0.3 mm, or 0.5 mm, to ensure sufficient contact between the inner conical hole 2-1 and the outer conical surface 3-2, and sufficient contact between the inner cylindrical hole and the steel strand 1, after the teeth break. Simultaneously, the extrusion sleeve 2 experiences relatively low extrusion pressure, meaning a lower requirement for the output extrusion pressure of the anchoring extrusion press, facilitating the manufacturing of the extrusion anchor.

[0050] 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 jacket 2 to ensure that the wall of the inner conical hole 2-1 and the outer conical surface 3-2 are in full contact after the teeth break, and that the wall of the inner cylindrical hole is in full contact with the steel strand 1.

[0051] Because the extrusion anchor of this invention also adopts the principle of conical hole and conical wedge anchoring, the inner extrusion sleeve 3 and the outer extrusion sleeve 2 are not easily separated, while the inner extrusion sleeve 3 and the steel strand 1 are easily separated. As a preferred embodiment, the tooth height on the inner cylindrical hole wall is greater than the tooth height on the outer conical surface 3-2. At this time, the tooth height on the inner cylindrical hole wall 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-out pressure of the extrusion anchor.

[0052] In other specific embodiments, the tooth height on the wall of the inner cylindrical hole may be slightly less than or equal to the tooth height on the outer conical surface 3-2.

[0053] Specific embodiments of the extrusion sleeve assembly provided by this utility model:

[0054] Reference Figures 4-8 As shown, the extrusion sleeve assembly includes an unextruded inner extrusion sleeve 3 and an outer extrusion sleeve 2. During the manufacturing of the extrusion anchor, the extrusion sleeve assembly is fitted onto the steel strand 1, and then processed using an anchoring extrusion machine. The extrusion sleeve assembly is any one of the extrusion sleeve assemblies in the specific embodiments of the extrusion anchor of this utility model, and will not be described in detail here.

[0055] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features, or organically combine different specific implementation methods to create the specific implementation methods shown in the accompanying drawings. Of course, those skilled in the art can also create other specific implementation methods not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An extrusion anchor, characterized in that, It includes a steel strand, an inner extrusion sleeve, and an outer extrusion sleeve. The outer extrusion sleeve has an inner conical hole, and the inner extrusion sleeve has an outer conical surface that matches the inner conical hole. The inner extrusion sleeve is extruded between the steel strand and the outer extrusion sleeve, and the crushing teeth on the inner extrusion sleeve are crushed and embedded in the steel strand and the outer extrusion sleeve.

2. The compression anchor as described in claim 1, characterized in that, Along the axial direction of the inner conical hole, the two ends of the extrusion inner sleeve are flush with the two ends of the extrusion outer sleeve.

3. The compression anchor as described in claim 1 or 2, characterized in that, The extrusion sleeve also includes an inner cylindrical hole for the steel strand to pass through, and the inner cylindrical hole wall and the outer conical surface are both machined with threads, the teeth of which constitute the breaking teeth.

4. The compression anchor as described in claim 3, characterized in that, The height of the tooth is no greater than 0.5 mm.

5. The extrusion anchor as described in claim 3, characterized in that, The tooth height on the inner cylindrical hole wall is greater than the tooth height on the outer conical surface.

6. An extrusion sleeve assembly, characterized in that, The device includes an inner extrusion sleeve and an outer extrusion sleeve. The outer extrusion sleeve has an inner conical bore, and the inner extrusion sleeve has an outer conical surface that matches the inner conical bore and an inner cylindrical bore for the steel strand to pass through. The inner extrusion sleeve also includes breaking teeth disposed on the bore walls of the outer conical surface and the inner cylindrical bore. The breaking teeth are used to break and embed the steel strand and the outer extrusion sleeve during the extrusion forming of the extrusion anchor.

7. The extrusion sleeve assembly as described in claim 6, characterized in that, In the axial direction of the inner conical hole, the length of the inner extrusion sleeve is greater than the length of the outer extrusion sleeve, and the lengths of the inner extrusion sleeve and the outer extrusion sleeve satisfy the following condition: after the inner extrusion sleeve and the outer extrusion sleeve are extruded and deformed, the two ends of the inner extrusion sleeve and the two ends of the outer extrusion sleeve are flush.

8. The extrusion sleeve assembly as described in claim 6 or 7, characterized in that, The inner cylindrical hole and the outer conical surface are threaded, and the teeth of the thread constitute the breaking teeth.

9. The extrusion sleeve assembly as described in claim 8, characterized in that, The height of the tooth is no greater than 0.5 mm.

10. The extrusion sleeve assembly as described in claim 6 or 7, characterized in that, The tooth height on the inner cylindrical hole wall is greater than the tooth height on the outer conical surface.

Images