Four-petal expansion shell anchor head

Abstract

The utility model relates to a four-piece expansion shell anchor head in the technical field of anchoring, which comprises an anchor head body and an anchor head block which can be correspondingly connected with an anchor rod, the anchor head body comprises a tubular trouser body part, and one end of the tubular trouser body part is provided with a tubular conical part of which the outer side surface is a conical surface; the anchor head block comprises a connecting ring, four anchor petals are evenly and annularly arranged on one end face of the connecting ring at intervals in the circumferential direction of the connecting ring, and the outer ends of the four anchor petals are correspondingly matched with the outer side face of the tubular conical part; the inner end face of the closed end of the U-shaped connecting piece is in press fit with the end face of the other end of the tubular trouser body part, the two ends of the open end of the U-shaped connecting piece are both connected to the side wall of the other end of the connecting ring in a hung mode, and the two sides of the U-shaped connecting piece are both located between the two corresponding anchor petals; due to the structural design that the anchor head block is provided with the connecting ring, the positions of the four anchor petals in the expansion-shell anchor head cannot deviate, and compared with the prior art, the expansion-shell anchor head has the advantage that the stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of anchoring, in particular to a four-petal expansion shell anchor head. Background Art

[0002] In the field of geotechnical anchoring engineering, anchor support is a key process. The use of prestressed anchor systems in anchor support for medium-hard rock formations is a common form, which usually requires a certain amount of prestress to be applied, followed by reinforcement through grouting. During the process of prestressing, if the stress value does not meet the requirements or the prestressing is not ideal, it may cause certain engineering accidents.

[0003] The existing Chinese patent with publication number CN210459205U discloses an anchor head structure, specifically an anchor head block, an anchor head body, and a hammer body that can be connected to an anchor rod. The anchor head block includes a top ring and a plurality of connecting belts arranged on the circumference of the top ring. The anchor head body includes a plurality of anchor petals that correspond to the connecting belts one by one and are connected by locking members. When using this anchor head structure, it is found that the position of the anchor petals is not stable enough and is prone to displacement, and it is difficult to assemble the anchor head block and the anchor petals.

[0004] In view of this, there is an urgent need for a four-petal expansion shell anchor head that can solve the above problems. Utility Model Content

[0005] In order to overcome the deficiencies in the background technology, the utility model discloses a four-petal expansion shell anchor head.

[0006] In order to achieve the above-mentioned invention object, the utility model adopts the following technical solutions:

[0007] A four-petal expansion shell anchor head, comprising an anchor head body and an anchor head block that can be connected to an anchor rod, the anchor head body comprising a tubular body portion, one end of the tubular body portion is provided with a tubular conical portion whose outer side surface is a conical surface; the anchor head block comprises a connecting ring, one end surface of the connecting ring is provided with four anchor petals at even intervals along its circumference, and the outer ends of the four anchor petals are correspondingly matched with the outer side surface of the tubular conical portion;

[0008] It also includes a U-shaped connector, the inner end face of the closed end of the U-shaped connector is pressed onto the other end face of the tubular trouser body, both ends of the open end of the U-shaped connector are hung on the side wall of the other end of the connecting ring, and both sides of the U-shaped connector are located between the corresponding two anchor petals.

[0009] Preferably, the tubular trouser body is provided with axial embedding grooves at positions corresponding to the two sides of the U-shaped connector, so as to limit the relative rotation between the anchor head body and the U-shaped connector.

[0010] Preferably, a radial embedding groove is provided on an end surface of the tubular trouser body portion away from the tubular tapered portion at a position corresponding to the closed end of the U-shaped connector, so as to limit the relative rotation between the anchor head body and the U-shaped connector.

[0011] Preferably, the side wall of one end of the connecting ring away from the anchor petal is provided with embedding notches at positions corresponding to the two ends of the opening end of the U-shaped connecting piece, so as to limit the relative rotation between the anchor head block and the U-shaped connecting piece.

[0012] Preferably, the outer side wall of the anchor flap is provided with an inverted tooth structure.

[0013] Preferably, the outer side surface of the connecting ring is provided with a plurality of fins evenly spaced along its circumference, and the plurality of fins are tapered in profile, and the end of the tapered profile facing away from the anchor head body is a large head end.

[0014] Preferably, a fitting portion is provided at one end of the fin corresponding to the connecting ring, and the fitting portion is correspondingly connected to the outer side surface of the connecting ring.

[0015] Preferably, an assembly groove is provided on the outer side of the connecting ring at a position corresponding to the fitting portion.

[0016] Preferably, a grouting channel (121) is provided between the tubular conical portion and the anchor flap.

[0017] Preferably, an outer circumferential edge of an end surface of the tubular trouser body portion facing away from the tubular tapered portion is provided with a chamfer.

[0018] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0019] 1. Since the anchor head block has a connecting ring structure, the positions of the four anchor petals in the expansion shell anchor head will not be offset, which improves stability compared with the prior art;

[0020] 2. Due to the structural design of the anchor head block with a connecting ring, the stable matching of the anchor head body and the anchor head block can be completed by only one U-shaped connecting piece, and the installation method of the U-shaped connecting piece only presses the anchor head body and hangs the anchor head block. Compared with the prior art, the assembly method of the U-shaped connecting piece is more convenient and quick;

[0021] 3. Due to the setting of the fins, when the anchor rod is pulled outward, the outer end of the fin can contact the wall of the rock hole to prevent the anchor head block from moving toward the rock hole mouth, ensuring that the anchor head body and the anchor head block can move smoothly relative to each other, so that the anchor petal can be fully expanded. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model;

[0023] Figure 2 It is a top view of the utility model;

[0024] Figure 3 It is the AA cross-sectional view of the present utility model.

[0025] In the figure: 1. anchor head body; 11. tubular body portion; 111. axial embedding groove; 112. radial embedding groove; 12. tubular tapered portion; 121. grouting channel; 2. anchor head block; 21. connecting ring; 211. embedding notch; 212. assembly groove; 22. anchor petal; 221. inverted tooth structure; 23. fin; 231. fitting portion; 3. U-shaped connector. DETAILED DESCRIPTION

[0026] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application, in order to facilitate the description of the present invention; it should be understood that if there are terms such as "end", "side", "end part", "lateral", "transverse", "longitudinal", etc. indicating directions or positional relationships, they only correspond to the length and width of the corresponding parts, that is, "end part" indicates the head and tail areas in the length direction of the corresponding part, and "side part" indicates the head and tail areas in the width direction of the corresponding part; this is for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction.

[0027] Embodiment 1, in combination with the attached Figure 1-3 A four-petal expansion shell anchor head comprises an anchor head body 1 and an anchor head block 2 which can be connected to an anchor rod. The anchor head body 1 comprises a tubular body portion 11, and one end of the tubular body portion 11 is provided with a tubular conical portion 12 whose outer side surface is a conical surface; the anchor head block 2 comprises a connecting ring 21, and one end surface of the connecting ring 21 is provided with four anchor petals 22 at evenly spaced intervals along its circumference, and the outer ends of the four anchor petals 22 are correspondingly matched with the outer side surface of the tubular conical portion 12.

[0028] When the anchor head body 1 is manufactured, according to the need, a section of a pipe can be cut or the outer annular surface can be reduced in diameter so that the outer side surface of the section of the pipe is a conical surface. In this case, the section of the pipe can be regarded as a tubular tapered portion 12, and the other section can be regarded as a tubular trousers portion 11; according to the need, a section of a pipe can be cut so that the outer side surface of the section of the pipe is a pyramidal surface or the outer side surface is divided into pyramidal surfaces. In this case, the section of the pipe can be regarded as a tubular tapered portion 12, and the other section can be regarded as a tubular trousers portion 11. According to the need, the anchor head body 1 can also be manufactured by other means, which are not specifically limited.

[0029] As required, the tubular trouser body portion 11 and the tubular tapered portion 12 may be integrally formed or connected by welding.

[0030] Furthermore, the inner wall of the tubular trouser body portion 11 and / or the tubular tapered portion 12 has a threaded portion that matches the thread of the anchor rod.

[0031] When the anchor head block 2 is manufactured, four anchor petals 22 structures can be formed by opening four axial grooves in a pipe section as required; it can also be manufactured by other means, which are not specifically limited.

[0032] Specifically, the inner diameter of the connecting ring 21 is larger than the inner diameter of the tubular body portion 11 , so that the anchor rod can pass through the anchor head block 2 and be threadedly engaged with the anchor head body 1 .

[0033] As required, in order to increase the anchoring strength, the outer side wall of the anchor petal 22 may be provided with an inverted tooth structure 221 .

[0034] As required, the distance between the inner sections of two adjacent anchor petals 22 is greater than the distance between the outer sections of two adjacent anchor petals 22, so as to increase the connectivity between the rock hole and the inner cavity of the anchor head block 2, that is, the smoothness of the passage of slurry.

[0035] As required, in order to facilitate insertion into a rock hole, the outer edge of one end of the tubular body portion 11 away from the tubular tapered portion 12 is chamfered; that is, the end of the tubular body portion 11 away from the tubular tapered portion 12 is set to a tapered structure.

[0036] Combined with Figure 3 , and also includes a U-shaped connector 3, the inner end surface of the closed end of the U-shaped connector 3 is pressed onto the other end surface of the tubular trouser body 11, and both ends of the open end of the U-shaped connector 3 are hung on the side wall of the other end of the connecting ring 21, and both sides of the U-shaped connector 3 are located between the corresponding two anchor petals 22; that is, the U-shaped connector 3 will not affect the expansion action of the anchor petals 22.

[0037] As required, the two ends of the opening of the U-shaped connector 3 can be bent 180 degrees to complete the hanging operation with the side wall of the other end of the connecting ring 21.

[0038] During assembly, firstly, the outer end of the tubular tapered portion 12 is inserted into the position between the four anchor petals 22, and then the anchor head body 1 and the anchor head block 2 are fixed by the U-shaped connector 3 so that the anchor head body 1 and the anchor head block 2 will not separate.

[0039] Since the anchor head block 2 has a connecting ring 21, the positions of the four anchor petals 22 in the expansion shell anchor head will not be offset, which improves stability compared to the prior art.

[0040] Since the anchor head block 2 has a structural design of a connecting ring 21, the stable matching of the anchor head body 1 and the anchor head block 2 can be completed only by a U-shaped connecting piece 3, and the installation method of the U-shaped connecting piece 3 only presses the anchor head body 1 and hangs the anchor head block 2. Compared with the prior art, the assembly method of the U-shaped connecting piece 3 is more convenient and quick.

[0041] When in use, first pass the end of the anchor rod through the anchor head block 2 and screw it to the anchor head body 1, then insert the end of the anchor rod equipped with the expansion shell anchor head into the bottom of the rock hole, and then pull the anchor rod outward, the anchor rod and the anchor head body 1 move relative to each other, at this time the anchor head body 1 and the anchor head block 2 move relative to each other, and the anchor petal 22 expands to the surroundings under the action of the tubular tapered portion 12, completing the operation of applying prestress to the bottom of the rock hole.

[0042] Embodiment 2, combined with the attached Figure 1 , 3 A four-petal expansion shell anchor head, based on the first embodiment, in order to prevent the anchor head body 1 and the U-shaped connecting piece 3 from rotating relative to each other: Figure 1 , 3 The tubular body 11 is provided with axial embedding grooves 111 at positions corresponding to the two sides of the U-shaped connector 3; this can not only limit the relative rotation between the anchor head body 1 and the U-shaped connector 3, but also prevent the width of the two sides of the U-shaped connector 3 from being greater than the diameter of the anchor head body 1, affecting the operation of inserting the expansion shell anchor head into the rock hole.

[0043] Or combined with Figure 3 A radial embedding groove 112 is provided at the end of the tubular body portion 11 away from the tubular tapered portion 12 at a position corresponding to the closed end of the U-shaped connector 3, so that the anchor head body 1 and the U-shaped connector 3 can be restricted from rotating relative to each other.

[0044] It should be noted that the axial embedding groove 111 and the radial embedding groove 112 may also exist at the same time.

[0045] To prevent the anchor block 2 and the U-shaped connector 3 from rotating relative to each other: Figure 1 , 3 An embedding notch 211 is provided at the position corresponding to the two ends of the open end of the U-shaped connector 3 on the side wall of the end of the connecting ring 21 away from the anchor petal 22; that is, when the open end of the U-shaped connector 3 is bent 180 degrees and connected to the connecting ring 21, the bottom of the hook formed by bending the open end of the U-shaped connector 3 180 degrees can be located in the embedding notch 211.

[0046] At this time, since the U-shaped connecting piece 3 and the anchor head block 2 will not rotate relative to each other, the U-shaped connecting piece 3 and the anchor head body 1 will not rotate relative to each other, and therefore the anchor head body 1 and the anchor head block 2 will not rotate relative to each other either.

[0047] Embodiment 3, in combination with the attached Figure 1 , 3 A four-petal expansion shell anchor head, based on the first or second embodiment, a plurality of fins 23 are evenly spaced along the circumference of the outer side of the connecting ring 21, and the plurality of fins 23 have a conical profile, and the end of the conical profile away from the anchor head body 1 is the large head end.

[0048] As required, the fins 23 can be directly welded to the outer side surface of the connecting ring 21 .

[0049] In order to conveniently control the angle of the fin 23 before welding, a fitting portion 231 is provided at one end of the fin 23 corresponding to the connecting ring 21 , and the fitting portion 231 is correspondingly connected to the outer side of the connecting ring 21 ; that is, the fitting portion 231 can fit the outer side of the connecting ring 21 .

[0050] In order to prevent the diameter of the contour circle formed by the fitting portion 231 from being larger than the outer diameter of the connecting ring 21 and affecting the insertion into the rock hole, an assembly groove 212 is provided on the outer surface of the connecting ring 21 at a position corresponding to the fitting portion 231 .

[0051] As required, the depth of the assembly groove 212 is greater than the width of the fitting portion 231 , that is, the fitting portion 231 can be completely located in the groove cavity of the assembly groove 212 .

[0052] As required, the bottom surface of the assembly groove 212 can be an arc surface or a plane; that is, the fitting portion 231 can be an arc plate or a flat plate.

[0053] This arrangement can prevent the anchor head block 2 from moving toward the rock hole opening by causing the outer ends of the fins 23 to abut against the rock hole wall when the anchor rod is pulled outward.

[0054] As required, the fins 23 are made of elastic steel, that is, when inserted into a rock hole, the outer ends of the fins 23 can shrink and deform, so that the diameter of the contour circle formed by the outer ends of all the fins 23 becomes smaller.

[0055] Embodiment 4, in combination with the attached Figure 1 , 3 A four-petal expansion shell anchor head, based on any one of embodiments one to three, in order to increase the connectivity between the rock hole and the inner cavity of the expansion shell anchor head, a grouting channel 121 is provided between the tubular conical portion 12 and the anchor petal 22.

[0056] As required, a grouting channel 121 may be directly opened in the tubular tapered portion 12 .

[0057] As required, when the outer side surface of the tubular conical portion 12 is a conical surface, a pyramidal surface may be opened on the outer side surface of the tubular conical portion 12 to form a grouting channel 121 through the cooperation of the pyramidal surface and the inner arc surface of the anchor petal 22 .

[0058] It should be noted that this embodiment is implemented on the basis of the second embodiment to achieve better effect, that is, when there is no relative rotation between the anchor head body 1 and the anchor head block 2, the position relationship between the channel 121 and the anchor petal 22 will not change except the axial position.

[0059] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. A four-petal expansion shell anchor head, comprising an anchor head body (1) and an anchor head block (2) capable of being connected to an anchor rod, characterized in that: The anchor head body (1) comprises a tubular body portion (11), one end of which is provided with a tubular conical portion (12) whose outer side surface is a conical surface; the anchor head block (2) comprises a connecting ring (21), one end surface of which is provided with four anchor petals (22) at even intervals along its circumference, and the outer ends of the four anchor petals (22) are correspondingly matched with the outer side surface of the tubular conical portion (12); It also comprises a U-shaped connecting piece (3), wherein the inner end surface of the closed end of the U-shaped connecting piece (3) is pressed against the other end surface of the tubular trouser body (11), the two ends of the open end of the U-shaped connecting piece (3) are both hung on the side wall of the other end of the connecting ring (21), and the two side portions of the U-shaped connecting piece (3) are both located between the corresponding two anchor petals (22).

2. A four-petal expansion shell anchor head according to claim 1, characterized in that: The tubular trouser body (11) is provided with axial embedding grooves (111) at positions corresponding to the two sides of the U-shaped connecting piece (3) so as to limit the relative rotation of the anchor head body (1) and the U-shaped connecting piece (3).

3. A four-petal expansion shell anchor head according to claim 1, characterized in that: A radial embedding groove (112) is provided at a position corresponding to the closed end of the U-shaped connecting piece (3) on the end surface of the tubular trouser body portion (11) away from the tubular conical portion (12), so as to limit the relative rotation of the anchor head body (1) and the U-shaped connecting piece (3).

4. A four-petal expansion shell anchor head according to claim 1, characterized in that: The side wall of one end of the connecting ring (21) away from the anchor flap (22) is provided with embedding notches (211) at positions corresponding to the two ends of the opening end of the U-shaped connecting piece (3), so as to limit the relative rotation of the anchor head block (2) and the U-shaped connecting piece (3).

5. The four-petal expansion shell anchor head according to claim 1, characterized in that: The outer side wall of the anchor flap (22) is provided with an inverted tooth structure (221).

6. A four-petal expansion shell anchor head according to claim 1, characterized in that: The outer side surface of the connecting ring (21) is provided with a plurality of fins (23) at even intervals along its circumference, and the plurality of fins (23) present a conical profile, wherein the end of the conical profile that faces away from the anchor head body (1) is a large head end.

7. A four-petal expansion shell anchor head according to claim 6, characterized in that: An end of the fin (23) corresponding to the connecting ring (21) is provided with a fitting portion (231), and the fitting portion (231) is correspondingly connected to the outer side surface of the connecting ring (21).

8. A four-petal expansion shell anchor head according to claim 7, characterized in that: An assembly groove (212) is provided on the outer side of the connection ring (21) at a position corresponding to the fitting portion (231).

9. A four-petal expansion shell anchor head according to claim 1, characterized in that: A grouting channel (121) is provided between the tubular tapered portion (12) and the anchor flap (22).

10. The four-petal expansion shell anchor head according to claim 1, characterized in that: The outer circumferential edge of one end surface of the tubular trouser body portion (11) facing away from the tubular tapered portion (12) is provided with a chamfer.

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