Post-expanded-base anchor bolt with high anchoring force

Abstract

The utility model discloses a high-anchoring-force rear expanded-base anchor bolt, which is characterized by further comprising an expansion sleeve, an anchor rod and an anchor rod, a containing groove is formed in the outer side face of the expansion sleeve, the expansion piece is located at an opening of the containing groove, the lower end of the expansion piece is fixedly connected with the expansion sleeve, and a gap between the expansion piece and the containing groove forms an inverted U shape. The expansion assembly is used for driving the expansion pieces to expand outwards; the bottom expanding assembly is used for driving the expansion sleeve to perform bottom expanding anchoring; the driving assembly is used for driving the expansion sleeve to rotate, and the expansion pieces are arranged, so that the expansion pieces expand outwards conveniently to form a barb structure on the expansion sleeve, and after the expansion sleeve of the anchor bolt is subjected to rear expanded-base anchoring through the expanded-base assembly, double anchoring can be conducted through the barb structure formed by the expansion pieces; and the barb structure also plays a role in preventing the expansion sleeve from being separated from the prefabricated hole, so that the friction force is increased, and the anchoring force is better.

Description

Technical Field

[0001] The utility model belongs to the technical field of anchor bolts, and particularly relates to a rear-enlarged bottom anchor bolt with high anchoring force. Background Art

[0002] Anchor bolts are components that are anchored in the base material by the friction or locking action between the anchor bolt and the drill hole. Expanded bottom anchor bolts are one type of anchor bolts. Expanded bottom anchor bolts are divided into mold expanded bottom anchor bolts and post-expanded bottom anchor bolts. Molded bottom anchor bolts are expanded bottom anchor bolts that are pre-expanded with a special mold drill bit and then installed. Post-expanded bottom anchor bolts are expanded bottom anchor bolts with a hard blade on the anchor bolt expansion sleeve. The expansion of the hole and the embedding of the expansion piece are completed at the same time as the anchor bolt is installed.

[0003] However, when the rear bottom anchor bolt is used, it is generally anchored only by the expansion of the expansion sleeve. If the expansion sleeve is not fully expanded, it is easy to loosen. Therefore, it is necessary to propose a rear bottom anchor bolt with multiple anchoring measures to solve this problem. Summary of the invention

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions, a high anchoring force rear bottom expansion anchor bolt, characterized in that it includes:

[0005] An expansion sleeve, wherein the expansion sleeve is in the shape of a sleeve;

[0006] An expansion piece, wherein a placement groove is provided on the outer side of the expansion sleeve, the expansion piece is located at the opening of the placement groove, the lower end of the expansion piece is fixedly connected to the expansion sleeve, and the gap between the expansion piece and the placement groove forms an inverted U shape;

[0007] The expansion assembly is used to drive the expansion piece to expand outwards;

[0008] Bottom expansion assembly, used to drive the expansion sleeve to expand the bottom and anchor;

[0009] The driving assembly is used to drive the expansion sleeve to rotate.

[0010] Furthermore, the expansion assembly comprises:

[0011] A conical pin, wherein the lower end of the conical pin is provided with an inclined surface, and the inner side of the expansion piece is also provided with an inclined surface corresponding to the inclined surface of the conical pin;

[0012] A pin hole is provided on the expansion sleeve, the pin hole matches the conical pin, and the lower end of the pin hole is connected with the placement groove.

[0013] Furthermore, the bottom expansion assembly includes:

[0014] A nail body, the nail body being divided into a cylindrical portion and a conical portion from top to bottom, the diameter of the cylindrical portion matching the minor diameter of the conical portion and being fixedly connected;

[0015] Tongues, the tongues are in multiple numbers, the multiple tongues are fixedly connected to the lower end of the expansion sleeve and are evenly distributed in the circumferential direction;

[0016] A blade, the blade being fixedly arranged at the lower end of the tongue;

[0017] Wherein, the expansion sleeve is arranged on the cylindrical part of the nail body, and the inner diameter of the expansion sleeve matches the diameter of the cylindrical part.

[0018] Furthermore, the driving assembly includes:

[0019] A driving bar, the driving bar is detachably connected to the expansion sleeve, the driving bar is a rectangular parallelepiped, and the length of the driving bar is smaller than the diameter of the expansion sleeve;

[0020] A driving groove, which is provided at the upper end of the expansion sleeve, and the width of the driving groove matches the width of the driving strip;

[0021] A driving head is fixedly arranged on the upper end of the driving bar.

[0022] Furthermore, a positioning component is also included, and the positioning component includes:

[0023] A positioning column, the positioning column is located in the driving groove and is fixedly connected to the expansion sleeve;

[0024] A positioning hole is formed through the driving bar, and the size of the positioning hole matches the positioning column.

[0025] Furthermore, the lower surface of the blade has an inclined cutting surface, and the angle between the cutting surface and the horizontal plane is at least degrees.

[0026] Furthermore, the inner surface of the blade is provided with a bevel, and the inclination direction of the bevel on the inner surface of the blade is arranged corresponding to the surface line of the conical portion of the nail body.

[0027] Furthermore, a threaded hole is formed at the upper end of the nail body.

[0028] Furthermore, a plurality of circular grooves are provided through the expansion sleeve, the circular grooves are located at the connection between two adjacent tongue pieces, and the circular grooves are provided through the interval between the two adjacent tongue pieces.

[0029] Furthermore, the lower end surface of the conical portion of the nail body has a conical tip.

[0030] The beneficial effects of the utility model are:

[0031] 1. The setting of the expansion piece facilitates the formation of a barb structure on the expansion sleeve by expanding the expansion piece outward, so that the expansion sleeve of the anchor bolt can be doubly anchored by the barb structure formed by the expansion piece after the expansion sleeve is expanded and anchored by the bottom expansion component. The barb structure also prevents the expansion sleeve from detaching from the prefabricated hole, increases the friction force, and makes the anchoring force better.

[0032] 2. By setting up the expansion assembly, when it is necessary to drive the expansion piece to expand and deform outward, the expansion piece can be expanded and deformed outward by driving a conical pin, and a barb-like structure is formed while squeezing the inner wall of the prefabricated hole, so that the fixing effect of the expansion sleeve is better.

[0033] 3. The setting of the driving assembly facilitates the rotation of the expansion sleeve, and because the length of the driving bar is smaller than the diameter of the expansion sleeve, the driving bar will not interfere with the prefabricated hole when in use. The driving head is a hexagonal head, which is convenient for rotating the driving head through a tool to drive the driving bar to rotate.

[0034] 4. The setting of the positioning component facilitates limiting the movement of the driving bar through the cooperation of the positioning column and the positioning hole when the driving bar is located in the driving groove, thereby preventing the driving bar from shaking and making the use of the driving bar more stable.

[0035] 5. By opening a bevel on the inner surface of the blade, and the inclination direction of the inner surface bevel of the blade is set corresponding to the surface line of the conical part of the nail body, when the tongue piece deforms downward, expands or rotates on the conical part of the nail body, the blade is not easy to interfere with the conical part of the nail body, which can reduce the friction between the blade and the nail body during the expansion of the tongue piece.

[0036] 6. By opening the threaded hole, after the utility model is fixedly arranged in the prefabricated hole, when the object needs to be fixed, the bolt can pass through the expansion sleeve and extend into the prefabricated hole to be threadedly connected with the threaded hole of the nail body, thereby fixing the object.

[0037] 7. By providing a circular groove, and setting the circular groove through the interval between two adjacent tongue pieces, it is helpful for the tongue pieces to expand and unfold better, and avoid cracking at the connection between adjacent tongue pieces.

[0038] 8. By providing a conical tip at the lower end of the conical portion of the nail body, since the drill bit generally has a top angle, the bottom of the prefabricated hole drilled by the drill bit will also have a conical angle, so that after the nail body is placed in the prefabricated hole, it is convenient to position it through the conical tip and the conical angle of the bottom of the prefabricated hole, thereby facilitating the setting of the nail body. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Attached Figure 1 It is a structural diagram of the utility model;

[0040] Attached Figure 2This is a diagram of the separation structure of the drive bar, the expansion sleeve and the nail body;

[0041] Attached Figure 3 This is a cross-sectional view of the utility model when it is set in a prefabricated hole and not fixed;

[0042] Attached Figure 4 For attachment Figure 3 A is an enlarged schematic diagram;

[0043] Attached Figure 5 This is a cross-sectional view of the utility model after multiple anchoring in a prefabricated hole;

[0044] Attached Figure 6 This is a structural diagram of the utility model after expansion;

[0045] Attached Figure 7 It is a cross-sectional schematic diagram of the lower half of the expansion sleeve;

[0046] Explanation of the reference numerals: 1. nail body, 2. cylindrical part, 3. conical part, 4. expansion sleeve, 6. tongue, 7. blade, 8. drive strip, 9. drive groove, 10. drive head, 11. positioning column, 12. positioning hole, 13. expansion plate, 14. placement groove, 15. conical pin, 16. pin hole, 17. cutting surface, 18. threaded hole, 19. circular groove. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work belong to the scope of protection of the present application. In the description of the present application, it should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but in appropriate cases, the techniques, methods and devices should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values, and it should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0048] Embodiment 1:

[0049] This embodiment provides a high anchoring force rear bottom expansion anchor bolt, characterized in that it also includes:

[0050] An expansion sleeve 4, wherein the expansion sleeve 4 is in a sleeve shape;

[0051] The expansion piece 13, the outer side of the expansion sleeve 4 is provided with a placement groove 14, the expansion piece 13 is located at the opening of the placement groove 14, the lower end of the expansion piece 13 is fixedly connected to the expansion sleeve 4, and the gap between the expansion piece 13 and the placement groove 14 forms an inverted U shape;

[0052] An expansion assembly, used to drive the expansion sheet 13 to expand outwards;

[0053] The bottom expansion component is used to drive the expansion sleeve 4 to expand the bottom and anchor;

[0054] The driving assembly is used to drive the expansion sleeve 4 to rotate.

[0055] In the present technical solution, since the expansion sleeve 4 and the expansion sheet 13 are provided, when the expansion sleeve 4 of the anchor bolt needs to be anchored in the prefabricated hole, the expansion sleeve 4 can be expanded and anchored by the bottom expansion component, and then the expansion sleeve 4 needs to be anchored multiple times;

[0056] At this time, the expansion piece 13 can be driven to expand outward through the expansion assembly. Since the gap between the expansion piece 13 and the placement groove 14 forms an inverted U shape, the expansion piece 13 will present a barb-like structure after expanding outward, thereby multiple anchoring of the expansion sleeve 4 is performed.

[0057] Through this structural design, the setting of the expansion plate 13 makes it convenient to expand the expansion plate 13 outward to form a barb structure on the expansion sleeve 4, so that the expansion sleeve 4 of the anchor bolt can be doubly anchored by the barb structure formed by the expansion plate 13 after the bottom expansion and anchoring is performed through the bottom expansion component. The barb structure also prevents the expansion sleeve 4 from detaching from the prefabricated hole, thereby increasing the friction force and making the anchoring force better.

[0058] Embodiment 2:

[0059] This embodiment provides a high anchoring force rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0060] Furthermore, the expansion assembly comprises:

[0061] A conical pin 15, wherein a bevel is formed at the lower end of the conical pin 15, and a bevel corresponding to the bevel of the conical pin 15 is formed at the inner side of the expansion piece 13;

[0062] The pin hole 16 is provided on the expansion sleeve 4 , the pin hole 16 matches the conical pin 15 , and the lower end of the pin hole 16 is connected with the placement groove 14 .

[0063] In the present technical solution, when the expansion piece 13 needs to be driven to expand and tighten toward the outer shape, the lower end of the conical pin 15 is placed in the pin hole 16, so that the inclined surface of the conical pin 15 corresponds to the inclined surface of the inner side of the expansion piece 13. After the conical pin 15 is placed in the pin hole 16, the inclined surface of the conical pin 15 will contact the inclined surface of the inner side of the expansion piece 13, and the gap between the inner side of the expansion piece 13 and the inner wall of the placement groove 14 is smaller than the lower end of the conical pin 15, so that the conical pin 15 cannot continue to move downward by its own weight.

[0064] The setting of the inclined surface has a guiding effect on the conical pin 15, which facilitates the lower end of the conical pin 15 to move toward the inner side of the expansion piece 13 and the inner wall of the placement groove 14, and then the conical pin 15 is driven into the pin hole 16 by hammering or other impact tools, so that the lower end of the conical pin 15 is forcibly inserted between the inner side of the expansion piece 13 and the inner wall of the placement groove 14. Since the expansion piece 13 is located at the opening of the placement groove 14, the lower end of the expansion piece 13 is fixedly connected to the expansion sleeve 4, and the gap between the expansion piece 13 and the placement groove 14 forms an inverted U-shape, so that after the lower end of the conical pin 15 is forcibly inserted between the inner side of the expansion piece 13 and the inner wall of the placement groove 14, the expansion piece 13 will deform outward, squeeze the inner wall of the prefabricated hole, and form a structure similar to a barb.

[0065] Through this structural design, by setting up a tightening component, when it is necessary to drive the tightening piece 13 to expand and deform outward, the conical pin 15 can be driven to expand and deform outward, and a barb-like structure is formed while squeezing the inner wall of the prefabricated hole, so that the fixing effect of the expansion sleeve 4 is better.

[0066] Embodiment 3:

[0067] This embodiment provides a high anchoring force rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0068] Furthermore, the bottom expansion assembly includes:

[0069] A nail body 1, wherein the nail body 1 is divided into a cylindrical portion 2 and a conical portion 3 from top to bottom, wherein the diameter of the cylindrical portion 2 matches the minor diameter of the conical portion 3 and they are fixedly connected;

[0070] Tongues 6, there are a plurality of tongues 6, and the plurality of tongues 6 are fixedly connected to the lower end of the expansion sleeve 4 and are evenly distributed in the circumferential direction;

[0071] A blade 7, wherein the blade 7 is fixedly disposed at the lower end of the tongue piece 6;

[0072] The expansion sleeve 4 is sleeved on the cylindrical portion 2 of the nail body 1 , and the inner diameter of the expansion sleeve 4 matches the diameter of the cylindrical portion 2 .

[0073] In the present technical solution, when it is necessary to expand the expansion sleeve 4 through the bottom expansion assembly for bottom expansion and anchoring, a prefabricated hole is first drilled with a drill bit, and the nail body 1 is placed facing the prefabricated hole. The diameter of the prefabricated hole is slightly larger than the major diameter of the conical portion 3 of the nail body 1. After the nail body 1 is located at the bottom of the prefabricated hole, the expansion sleeve 4 is placed in the prefabricated hole. The outer diameter of the expansion sleeve 4 is equal to the major diameter of the conical portion 3 of the nail body 1, so the expansion sleeve 4 can also be placed in the prefabricated hole, and several tongue pieces 6 of the expansion sleeve 4 are partially inserted toward the cylindrical portion 2 of the nail body 1, so that the expansion sleeve 4 will fall due to its own weight after being placed in the prefabricated hole. Since the inner diameter of the expansion sleeve 4 matches the diameter of the cylindrical portion 2 of the nail body 1, after the expansion sleeve 4 falls, several tongue pieces 6 at the lower part of the expansion sleeve 4 will surround the cylindrical portion 2 of the nail body 1.

[0074] When tightening is required, the expansion sleeve 4 is driven to rotate by the driving component, and a hammer or other impact tool is used to act on the driving component, so that the driving component transmits a downward impact force to the expansion sleeve 4, so that the expansion sleeve 4 has a downward moving force while rotating, so that the plurality of tongues 6 can rotate with the axis of the expansion sleeve 4 as the axis, so that the tongue 6 drives the blade 7 at the bottom of the tongue 6 to rotate;

[0075] As the expansion sleeve 4 moves downward, the plurality of tongues 6 surrounding the cylindrical portion 2 of the nail body 1 will also move toward the conical portion 3, so that the tongues 6 will be deformed through the contact between the conical portion 3 and the tongues 6, so that the plurality of tongues 6 and the blades 7 will form a cone, and the cone will increase as the expansion sleeve 4 moves downward. When the major diameter of the cone formed by the plurality of tongues 6 and the blades 7 matches the inner diameter of the prefabricated hole, the blades 7 will contact the prefabricated hole.

[0076] After the blade 7 contacts the prefabricated hole, as the expansion sleeve 4 rotates and moves downward, the blades 7 of the plurality of tongue pieces 6 are driven to rotate with the axis of the expansion sleeve 4 as the axis center, so that the blade 7 cuts by rotating, thereby cutting into the inner wall of the prefabricated hole, and moves downward while cutting the material, which has the effect of expanding the bottom of the prefabricated hole, so that the plurality of tongue pieces 6 are deformed and expanded to the maximum extent on the conical portion 3 of the nail body 1;

[0077] Since the conical major diameter formed by several tongues 6 and blades 7 is larger than the diameter of the prefabricated hole, it also means that the bottom of the prefabricated hole has been enlarged to be larger than the original inner diameter of the prefabricated hole. Therefore, the tongue 6 and the blade 7 are fixed to the enlarged part of the prefabricated hole through the expansion cooperation between the tongue 6 and the conical part 3 of the nail body 1, thereby fixing the expansion sleeve 4 and the nail body 1 expansion anchor in the prefabricated hole.

[0078] Through this structural design, by setting the tongue piece 6, the blade 7 and the nail body 1, when it is necessary to first expand the bottom of the expansion sleeve 4 through the bottom expansion component for anchoring, the expansion sleeve 4 and the nail body 1 can be placed in the prefabricated hole, and then the expansion sleeve 4 is rotated and moved downward to drive the tongue piece 6 to move toward the large diameter of the conical portion 3 of the nail body 1 and expand through the conical portion 3 of the nail body 1, and the blade 7 can drive the rotation of the tongue piece 6 through the expansion sleeve 4 to cut into the inner wall of the prefabricated hole, thereby expanding the bottom of the prefabricated hole. After the bottom of the prefabricated hole is expanded, the tongue piece 6 can also continue to move downward and expand outward, so that a plurality of tongue pieces 6 are deformed and expanded to the maximum extent on the conical portion 3 of the nail body 1, thereby expanding and anchoring the expansion sleeve 4 in the prefabricated hole.

[0079] Embodiment 4:

[0080] This embodiment provides a high anchoring force rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0081] Furthermore, the driving assembly includes:

[0082] A driving bar 8, wherein the driving bar 8 is detachably connected to the expansion sleeve 4, the driving bar 8 is a rectangular parallelepiped, and the length of the driving bar 8 is smaller than the diameter of the expansion sleeve 4;

[0083] A driving groove 9, which is provided at the upper end of the expansion sleeve 4, and the width of the driving groove 9 matches the width of the driving bar 8;

[0084] A driving head 10 is fixedly provided on the upper end of the driving bar 8 .

[0085] In the present technical solution, when it is necessary to drive the expansion sleeve 4 to rotate, the drive bar 8 can be inserted into the drive groove 9 at the upper end of the expansion sleeve 4. Since the length of the drive bar 8 is smaller than the diameter of the expansion sleeve 4, the drive bar 8 will not interfere with the prefabricated hole when in use. The drive head 10 is a hexagonal head. When it is necessary to rotate the drive bar 8, the drive head 10 is rotated by a tool, and the drive head 10 is given a downward force by an impact tool or a hammer, which can drive the drive bar 8 to have a downward force while rotating, thereby facilitating the transmission of power to the expansion sleeve 4.

[0086] Through this structural design and the setting of the driving component, it is convenient to drive the expansion sleeve 4 to rotate, and because the length of the driving bar 8 is smaller than the diameter of the expansion sleeve 4, the driving bar 8 will not interfere with the prefabricated hole when in use. The driving head 10 is a hexagonal head, which is convenient for rotating the driving head 10 by a tool to drive the driving bar 8 to rotate.

[0087] Embodiment 5:

[0088] This embodiment provides a high anchoring force rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0089] Furthermore, a positioning component is also included, and the positioning component includes:

[0090] A positioning column 11, wherein the positioning column 11 is located in the driving groove 9 and is fixedly connected to the expansion sleeve 4;

[0091] A positioning hole 12 is formed through the driving bar 8 , and a size of the positioning hole 12 matches that of the positioning column 11 .

[0092] In the present technical solution, when the driving bar 8 needs to drive the expansion sleeve 4 to rotate, the driving bar 8 needs to be inserted into the driving groove 9 of the expansion sleeve 4. By providing a positioning column 11 and a positioning hole 12, when the driving bar 8 is placed toward the driving groove 9, the positioning hole 12 of the driving bar 8 can be moved toward the positioning column 11 of the driving groove 9, so that after the driving bar 8 is placed in the driving groove 9, the positioning hole 12 and the positioning column 11 can be plugged in, thereby limiting the movement of the driving bar 8.

[0093] Through this structural design and the setting of the positioning component, when the drive bar 8 is located in the drive groove 9, the movement of the drive bar 8 can be restricted by the cooperation of the positioning column 11 and the positioning hole 12, thereby preventing the drive bar 8 from shaking and making the use of the drive bar 8 more stable.

[0094] Embodiment 6:

[0095] This embodiment provides a high anchoring force rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0096] Furthermore, the lower surface of the blade 7 has an inclined cutting surface 17, and the angle between the cutting surface 17 and the horizontal plane is at least 5 degrees.

[0097] In the present technical solution, by providing an inclined cutting surface 17, when the blade 7 cuts the hole wall of the prefabricated hole, the inclined cutting surface 17 makes the cutting effect better and facilitates the blade 7 to cut into the hole wall of the prefabricated hole.

[0098] Embodiment 7:

[0099] This embodiment provides a high anchoring force rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0100] Furthermore, the inner surface of the blade 7 is provided with a bevel, and the inclination direction of the inner surface bevel of the blade 7 is arranged corresponding to the surface plain line of the conical portion 3 of the nail body 1 .

[0101] In the present technical solution, a bevel is provided on the inner surface of the blade 7, and the inclination direction of the bevel on the inner surface of the blade 7 is arranged corresponding to the surface straight line of the conical portion 3 of the nail body 1, so that when the tongue 6 is deformed, expanded or rotated downward on the conical portion 3 of the nail body 1, the blade 7 is not easy to interfere with the conical portion 3 of the nail body 1, and the friction between the blade 7 and the nail body 1 during the expansion of the tongue 6 can be reduced.

[0102] Embodiment 8:

[0103] This embodiment provides a high anchoring force rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0104] Furthermore, a threaded hole 18 is formed at the upper end of the nail body 1 .

[0105] In the present technical solution, by opening a threaded hole 18, after the utility model is fixedly arranged in the prefabricated hole, when the object needs to be fixed, a bolt can be passed through the expansion sleeve 4 and extended into the prefabricated hole to be threadedly connected with the threaded hole 18 of the nail body 1, thereby fixing the object.

[0106] Embodiment 9:

[0107] This embodiment provides a high anchoring force rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0108] Furthermore, a plurality of circular grooves 19 are formed through the expansion sleeve 4 . The circular grooves 19 are located at the connection between two adjacent tongue pieces 6 . The circular grooves 19 are formed through the interval between two adjacent tongue pieces 6 .

[0109] In the present technical solution, the circular groove 19 is provided, and the circular groove 19 is arranged to penetrate the interval between two adjacent tongue pieces 6 , which helps the tongue pieces 6 to expand and unfold better, and avoids cracking at the connection between adjacent tongue pieces 6 .

[0110] Embodiment 10:

[0111] This embodiment provides a high anchoring force rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0112] Furthermore, the lower end surface of the conical portion 3 of the nail body 1 has a conical tip.

[0113] In the present technical solution, a conical tip is provided at the lower end of the conical portion 3 of the nail body 1. Since a drill bit generally has a top angle, the bottom of the prefabricated hole drilled by the drill bit will also have a conical angle. After the nail body 1 is placed in the prefabricated hole, it is convenient to position it through the conical tip and the conical angle of the bottom of the prefabricated hole, thereby facilitating the setting of the nail body 1.

[0114] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the specification of the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A high anchoring force rear bottom expansion anchor bolt, characterized in that: Included are: An expansion sleeve (4), wherein the expansion sleeve (4) is in the shape of a sleeve; An expansion piece (13), the outer side surface of the expansion sleeve (4) is provided with a placement groove (14), the expansion piece (13) is located at the opening of the placement groove (14), the lower end of the expansion piece (13) is fixedly connected to the expansion sleeve (4), and the gap between the expansion piece (13) and the placement groove (14) forms an inverted U shape; An expansion assembly, used for driving the expansion piece (13) to expand outwards; A bottom expansion component, used to drive the expansion sleeve (4) to expand the bottom and anchor; The driving assembly is used to drive the expansion sleeve (4) to rotate.

2. A high anchoring force rear bottom expansion anchor bolt according to claim 1, characterized in that: The expansion assembly comprises: A conical pin (15), wherein the lower end of the conical pin (15) is provided with an inclined surface, and the inner side of the expansion piece (13) is also provided with an inclined surface corresponding to the inclined surface of the conical pin (15); A pin hole (16), the pin hole (16) is provided on the expansion sleeve (4), the pin hole (16) matches the conical pin (15), and the lower end of the pin hole (16) is connected to the placement groove (14).

3. A high anchoring force rear bottom expansion anchor bolt according to claim 2, characterized in that: The bottom expansion assembly comprises: A nail body (1), the nail body (1) being divided from top to bottom into a cylindrical portion (2) and a conical portion (3), the diameter of the cylindrical portion (2) matching the minor diameter of the conical portion (3) and being fixedly connected; A tongue piece (6), wherein the tongue pieces (6) are in plurality, and the plurality of tongue pieces (6) are fixedly connected to the lower end of the expansion sleeve (4) and are evenly distributed in the circumferential direction; A blade (7), wherein the blade (7) is fixedly arranged at the lower end of the tongue (6); The expansion sleeve (4) is sleeved on the cylindrical portion (2) of the nail body (1), and the inner diameter of the expansion sleeve (4) matches the diameter of the cylindrical portion (2).

4. A high anchoring force rear bottom expansion anchor bolt according to claim 3, characterized in that: The drive assembly comprises: A driving bar (8), wherein the driving bar (8) is detachably connected to the expansion sleeve (4), the driving bar (8) is a rectangular parallelepiped, and the length of the driving bar (8) is smaller than the diameter of the expansion sleeve (4); A driving groove (9), wherein the driving groove (9) is provided at the upper end of the expansion sleeve (4), and the width of the driving groove (9) matches the width of the driving strip (8); A driving head (10), the driving head (10) is fixedly arranged on the upper end of the driving bar (8).

5. The high anchoring force rear bottom expansion anchor bolt according to claim 4, characterized in that: Also included is a positioning component, the positioning component comprising: A positioning column (11), wherein the positioning column (11) is located in the driving groove (9) and is fixedly connected to the expansion sleeve (4); A positioning hole (12), the positioning hole (12) is opened through the driving bar (8), and the size of the positioning hole (12) matches the positioning column (11).

6. A high anchoring force rear bottom expansion anchor bolt according to claim 4 or 5, characterized in that: The lower surface of the blade (7) has an inclined cutting surface (17), and the angle between the cutting surface (17) and the horizontal plane is at least 5 degrees.

7. The high anchoring force rear-enlarged bottom anchor bolt according to claim 6, characterized in that: The inner surface of the blade (7) is provided with an inclined surface, and the inclination direction of the inclined surface of the inner surface of the blade (7) is arranged corresponding to the surface line of the conical portion (3) of the nail body (1).

8. The high anchoring force rear-enlarged bottom anchor bolt according to claim 7, characterized in that: A threaded hole (18) is formed at the upper end of the nail body (1).

9. The high anchoring force rear bottom expansion anchor bolt according to claim 8, characterized in that: The expansion sleeve (4) is provided with a plurality of circular grooves (19), the circular grooves (19) are located at the connection between two adjacent tongue pieces (6), and the circular grooves (19) are provided to penetrate the interval between the two adjacent tongue pieces (6).

10. A high anchoring force rear bottom expansion anchor bolt according to claim 9, characterized in that: The lower end surface of the conical portion (3) of the nail body (1) has a conical tip.

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