CN216841750U

CN216841750U - Prestressed expansion shell anchor rod

Info

Publication number: CN216841750U
Application number: CN202121683923.3U
Authority: CN
Inventors: 罗士亮; 张雁; 罗志文; 沈陈最
Original assignee: Zhejiang Juneng Geotechnical Anchorage Research Co ltd
Current assignee: Zhejiang Juneng Geotechnical Anchorage Research Co ltd
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2022-06-28
Anticipated expiration: 2031-07-22

Abstract

The utility model relates to a prestressing force shell stock that rises, include: the shell expansion pieces are sequentially arranged and arranged in a surrounding manner; the top block is abutted to the lower side of the shell expansion piece, and a groove is formed in the lower side surface of the top block; the screw rod comprises a first rod part and a second rod part which are connected, an external thread is arranged on the first rod part, and the first rod part penetrates through the groove and extends to the space between the shell expansion pieces; and when the screw rod is rotated, the second rod part moves upwards and breaks the groove. The technical scheme of the utility model be through rotating the screw rod, second pole portion shifts up and bursts the recess, and the shell piece that rises expands, and the screw rod extension realizes exerting the prestressing force of stock.

Description

Prestressed expansion shell anchor rod

Technical Field

The utility model relates to a geotechnical engineering anchor struts technical field, especially relates to a prestressing force shell stock that rises.

Background

In the construction process of underground engineering, mine roadways, railway tunnels, slope protection and military engineering, in order to prevent stratum deformation, collapse and instability, the stratum needs to be reinforced, and the adopted main measure is to embed an anchor rod containing an expansion shell head in the stratum. But the existing anchor rod has the disadvantages of complex structure, higher cost and lower construction efficiency.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a prestressing force shell stock that rises, prestressing force shell stock that rises has characteristics such as simple structure, has better suitability.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a prestressed expanding shell anchor, comprising: the shell expansion pieces are sequentially arranged and arranged in a surrounding manner; the top block is abutted to the lower side of the shell expansion piece, and a groove is formed in the lower side surface of the top block; the screw rod comprises a first rod part and a second rod part which are connected, an external thread is arranged on the first rod part, and the first rod part penetrates through the groove and extends to the space between the shell expansion pieces;

and when the screw rod is rotated, the second rod part moves upwards and breaks the groove.

Preferably, a second through hole for the first rod part to pass through is arranged in the groove; and the diameter of the second rod part is larger than that of the second through hole.

Preferably, the shell-expanding anchor rod further comprises an extrusion block, the extrusion block is positioned on the lower side of the top block, the upper end of the extrusion block is inserted into the groove, and the extrusion block and the second rod are integrally formed or separately formed; the extrusion block is provided with a first through hole for the first rod part to pass through, and the diameter of the second rod part is larger than that of the first through hole.

Preferably, an internal thread is arranged in the first through hole, and the extrusion block is connected to the first rod part in a threaded manner.

Preferably, the shell expansion anchor rod further comprises a shell expansion inner wedge, a connecting hole is formed in the shell expansion inner wedge, an internal thread is arranged in the connecting hole, the shell expansion inner wedge is in threaded connection with the first rod portion, and the lower end of the shell expansion inner wedge is located between the shell expansion pieces.

Preferably, the inner side surface of the shell expansion piece comprises an inner ring surface and an inner conical surface, the inner conical surface is located on the upper side of the inner ring surface, the outer side surface of the shell expansion inner wedge is an outer conical surface, and the inner conical surface is abutted to the outer conical surface.

Preferably, the outer side surface of each expansion shell piece is provided with an arc-shaped mounting groove, and the mounting grooves are sequentially connected end to end; the shell expansion anchor rod further comprises fasteners, the fasteners are anchor ears, notches are formed in the anchor ears, and the anchor ears are arranged in the mounting grooves.

Preferably, the screw rod further comprises a third rod connected with the second rod part, and the third rod is provided with an external thread; the diameter of the second rod portion is larger than the diameter of the third rod portion.

Preferably, the shell expansion anchor rod further comprises a backing plate and a driving nut, wherein the backing plate is sleeved on the third rod and is abutted against the second rod part; the driving nut is connected to the third rod in a threaded mode and is abutted to the base plate.

Preferably, the outer side surface of each expansion shell piece is provided with sawteeth which are continuously arranged at intervals.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the prestressing force that provides among the above-mentioned technical scheme rises shell stock through will rising the shell piece arrange in proper order and encircle the setting, and the kicking block sets up in rising shell piece downside, and its upper surface with rise the lower extreme butt of shell piece, and the downside of kicking block is equipped with the recess, and the upper end of extrusion piece is inserted and is located in the recess. The screw rod is equipped with the screw thread including connecting first pole portion and the second pole portion that sets up in the first pole portion to pass extrusion piece, kicking block and the shell piece that rises in proper order. And the screw rod is rotated, the second rod part drives the extrusion block to move upwards and break the groove, and the extrusion block extends into the space between the expansion shell pieces, so that the anchor rod can be stretched, and prestress is applied to the anchor rod. The prestressed expanding shell anchor rod is simple in structure and high in construction efficiency.

Drawings

Fig. 1 is an assembly view of the shell expansion anchor rod provided by the embodiment of the present invention.

Fig. 2 is an exploded view of the expanding shell anchor rod provided by the embodiment of the present invention.

Fig. 3 is a schematic view of a screw rod provided by the embodiment of the present invention.

Fig. 4 is a schematic view of an inner wedge of an expanding shell according to an embodiment of the present invention.

Fig. 5 is a schematic view of the shell expansion sheet according to an embodiment of the present invention.

Fig. 6 is a schematic view of a top block according to an embodiment of the present invention.

Fig. 7 is a schematic view of an extrusion block according to an embodiment of the present invention.

Fig. 8 is a construction state diagram of the expansion shell anchor rod provided by the embodiment of the utility model.

1. A shell expanding sheet; 11. an inner ring surface; 12. an inner conical surface; 13. mounting grooves; 2. a top block; 21. a groove; 22. a second through hole; 3. extruding the block; 31. a first through hole; 4. a screw; 41. a first rod portion; 42. a second rod part; 43. a third lever; 5. expanding the shell and wedging; 51. an outer conical surface; 6. a fastener; 7. a base plate; 8. the nut is driven.

Detailed Description

The present invention will now be described in more detail with reference to the accompanying drawings, and it is to be understood that the following description of the present invention is made only by way of illustration and not by way of limitation with reference to the accompanying drawings. The various embodiments may be combined with each other to form other embodiments not shown in the following description.

Referring to fig. 1-2, an embodiment of the present invention provides a prestressed expanding shell anchor rod, including: a plurality of shell expanding pieces 1, a top block 2 and a screw rod 4. The shell expansion pieces 1 are sequentially arranged and arranged in a surrounding manner; the top block 2 is abutted to the lower side of the shell expansion piece 1, and a groove 21 is formed in the lower side surface of the top block 2; the screw rod 4 comprises a first rod part 41 and a second rod part 42 which are connected, wherein an external thread is arranged on the first rod part 41, and the first rod part 41 penetrates through the groove and extends to the space between the shell expansion pieces 1;

wherein, when the screw rod 4 is rotated, the second rod part 42 moves upwards and breaks the groove 21.

Referring to fig. 3-7, the screw rod 4 includes a first rod portion 41, a second rod portion 42 and a third rod 43. The two ends of the second rod portion 42 are respectively fixedly connected to the first rod portion 41 and the third rod portion 43, and are preferably integrally formed. I.e. the second lever part 42 is located between the first lever part 41 and the third lever 43. Wherein, the first rod part 41 and the third rod 43 are both provided with external threads, and the diameter of the second rod part 42 is larger than the diameters of the first rod part 41 and the third rod 43.

In a preferred embodiment, the pressing block 3 may not be provided. The lower side surface of the top block 2 is provided with a groove 21, the bottom surface of the groove 21 can be provided with a second through hole 22, and the diameter of the second through hole 22 is larger than that of the first rod part 41 and smaller than that of the second rod part 42. The first rod part 41 penetrates through the second through hole 22, the second rod part 42 is directly located on the lower side of the groove 21, and along with rotation of the screw rod 4, the second rod part 42 is abutted to the bottom surface of the groove 21 and breaks the groove 21, so that the second rod part 42 extends to the space between the shell expansion pieces 1, the screw rod 4 can be stretched, and prestress application to the anchor rod is realized.

In a preferred embodiment, the pressing block 3 can also be provided. The extrusion block 3 is provided with a first through hole 31, and the first through hole 31 extends along the length direction of the screw rod 4. And the diameter of the first through hole 31 is larger than that of the first rod part 41 and smaller than that of the second rod part 42. That is, when the first rod portion 41 passes through the first through hole 31, the upper end of the second rod portion 42 abuts against the lower side surface of the pressing block 3, so that the second rod portion 42 can drive the pressing block 3 to move upward.

Of course, in other embodiments, a step or a protrusion may be provided between the first rod portion 41 and the second rod portion 42, and the step or the protrusion abuts against the lower side surface of the pressing block 3.

More preferably, the extrusion block 3 may be integrally formed with the screw 4 or separately formed. More specifically, the first through hole 31 is not provided with an internal thread, that is, the extrusion block 3 is sleeved on the first rod portion 41.

In other embodiments, the first through hole 31 may be provided with an internal thread, i.e., the extrusion block 3 is screwed on the first shaft portion 41. At this time, after the lowest end of the first rod 41 enters the first through hole 31 by rotating, the second rod 42 has no external thread, so the screw 4 continues to rotate, and the extrusion block 3 cannot move downward along the second rod 42, that is, the second rod 42 can move the extrusion block 3 upward.

In a preferred embodiment, a second through hole 22 is formed in the top block 2, and the diameter of the second through hole 22 is larger than that of the first rod portion 41. That is, the first rod 41 can sequentially pass through the first through hole 31 and the second through hole 22 and extend into between the expansion sheets 1. Wherein the second through hole 22 may be disposed on a bottom surface of the groove 21.

Due to the presence of the recess 21, the thickness between the bottom surface of the recess 21 and the upper side of the top piece 2 is small, i.e. the structural strength of the bottom surface of the recess 21 is small. Turning the screw 4, the extrusion block 3 transfers force to the top block 2, more specifically, to the bottom surface of the groove 21. When the extrusion force exceeds the strength limit of the bottom surface of the groove 21, the bottom surface of the groove 21 is broken, and the upper end of the extrusion block 3 is inserted between the shell expansion pieces 1, so that the screw rod 4 is stretched, and the prestress application of the shell expansion anchor rod is realized.

In a preferred embodiment, the top block 2, the extrusion block 3 and the groove 21 are preferably cylindrical, and the shape of the groove 21 is adapted to the shape of the extrusion block 3.

In a preferred embodiment, the shell-expanding anchor rod further expands a shell inner wedge 5, a connecting hole is formed in the shell-expanding inner wedge 5, an internal thread is formed in the connecting hole, the shell-expanding inner wedge 5 is connected to the upper end of the first rod portion 41 in a threaded manner, and the lower end of the shell-expanding inner wedge 5 is inserted between the shell-expanding pieces 1.

In a preferred embodiment, the inner side surface of the shell expanding sheet 1 is provided with an inner annular surface 11 and an inner conical surface 12 which are arranged in a connecting manner, and the inner annular surface 11 is positioned at the lower side of the inner conical surface 12. More preferably, the inner conical surface 12 on the upper side has a diameter larger than the inner conical surface 12 on the lower side. Correspondingly, the outer side surface of the inner expanding-shell wedge 5 is an outer conical surface 51, and the diameter of the outer conical surface 51 on the upper side is larger than that of the outer conical surface 51 on the lower side. The inner tapered surface 12 is disposed in contact with the outer tapered surface 51. And under the action of the screw rod 4, the outer conical surface 51 can slide downwards along the inner conical surface 12, namely, the shell expansion inner wedge 5 enters between the shell expansion pieces 1. Due to the abutting arrangement of the inner conical surface 12 and the outer conical surface 51, the shell expansion inner wedge 5 can easily enter between the shell expansion pieces 1, and the shell expansion pieces 1 are easy and uniform in deformation.

More preferably, the number of the shell expansion pieces 1 is two, the shell expansion pieces 1 are arranged in a surrounding manner, and the interior of each shell expansion piece 1 is hollow after arrangement, so that the first rod part 41 can penetrate through the interior. Of course, in another embodiment, the number of the shell-expanding pieces 1 is not limited to the above, and may be three, four, or the like.

More preferably, a plurality of saw teeth are further arranged on the outer side surface of the shell expansion piece 1, and the saw teeth are arranged at intervals and can effectively increase the friction force between the shell expansion piece 1 and the hole wall.

In a preferred embodiment, the shell-expanding anchor rod further comprises a fastener 6, the fastener 6 is preferably an annular hoop, and the hoop is provided with a notch. Correspondingly, the outer side surface of each expansion shell piece 1 is provided with an arc-shaped installation groove 13, and the installation grooves 13 are connected end to form a complete circular ring. The anchor ear is installed in each of the installation grooves 13. And because the anchor ear is provided with the gap, the resistance born by the expansion shell sheet 1 during expansion can be reduced, and the use is more labor-saving.

More preferably, the fastening member 6 is provided outside the upper end of the shell-expanding piece 1, and since the lower end of the shell-expanding piece 1 abuts against the upper side surface of the top block 2, it is not necessary to provide one fastening member 6 outside the lower end of the shell-expanding piece 1. Because the shell expansion inner wedge 5 is positioned at the upper side of the shell expansion sheet 1, when the shell expansion inner wedge 5 moves downwards, the shell expansion sheet 1 can be uniformly deformed.

In a preferred embodiment, the expanding shell anchor rod further comprises a backing plate 7 and a driving nut 8, wherein a through hole is formed in the backing plate 7, and the diameter of the through hole is larger than that of the third rod 43 and smaller than that of the second rod 42. That is, the backing plate 7 can be sleeved on the third rod 43 and abut against the second rod 42. The driving nut 8 is screwed to the third rod 43 and is disposed in abutment with the pad 7. The base plate 7 is abutted against the rock wall of the anchor hole opening, and the screw rod 4 can be driven to rotate by rotating the driving nut 8.

Referring to fig. 8, the anchoring structure of the expanding anchor rod can be divided into three states during operation. The first state is an initial state, which is the first state diagram in fig. 8, and the expansion sheet 1 is not expanded yet. And the second state is an intermediate state, the driving nut 8 starts to rotate, and then the screw rod 4 is driven to rotate, and as the shell expansion inner wedge 5 is in threaded connection with the first rod part 41, the shell expansion inner wedge 5 can move downwards and extrude the shell expansion pieces 1 to expand. The driving nut 8 is continuously rotated until the inner expanding-shell wedges 5 completely enter between the expanding-shell pieces 1 and cannot move downwards any more, and at this time, the upper end of the second rod part 42 just abuts against the lower side surface of the extrusion block 3, which is the second state diagram in fig. 8. The third state is the complete state, which is the third state diagram in fig. 8. At this time, the driving nut 8 is continuously rotated, the second rod part 42 drives the extrusion block 3 to move upwards, the extrusion block 3 continuously extrudes the groove 21 until the structural strength of the bottom surface of the groove 21 is exceeded, the upper end of the extrusion block 3 breaks the groove 21 and extends into the space between the shell expansion pieces 1, and the screw rod 4 can be stretched, so that the prestress of the shell expansion anchor rod is applied.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. A prestressed expanding shell anchor rod is characterized by comprising:

the shell expansion pieces (1) are sequentially arranged and are arranged in a surrounding manner;

the jacking block (2) is abutted to the lower side of the expansion shell piece (1), and a groove (21) is formed in the lower side of the jacking block (2);

the screw rod (4) comprises a first rod part (41) and a second rod part (42) which are connected, an external thread is arranged on the first rod part (41), and the first rod part (41) penetrates through the groove (21) and extends to the space between the shell expansion pieces (1);

the screw rod (4) further comprises a third rod (43) connected with the second rod part (42), and an external thread is arranged on the third rod (43); the diameter of the second rod part (42) is larger than that of the third rod (43);

the shell expansion anchor rod further comprises a backing plate (7) and a driving nut (8), wherein the backing plate (7) is sleeved on the third rod (43) and is abutted against the second rod part (42); the driving nut (8) is connected to the third rod (43) in a threaded mode and is abutted to the base plate (7);

wherein, rotating the screw rod (4), the second rod part (42) moves upwards and breaks the groove (21).

2. A prestressed shell-expanding anchor rod as claimed in claim 1, wherein said recess (21) is provided with a second through hole (22) for passing said first rod portion (41); and the diameter of the second rod part (42) is larger than that of the second through hole (22).

3. The prestressed expanding shell anchor rod of claim 1, further comprising an extrusion block (3), wherein the extrusion block (3) is located at the lower side of the top block (2), the upper end of the extrusion block is inserted into the groove (21), and the extrusion block (3) and the second rod part (42) are integrally or separately molded; the extrusion block (3) is provided with a first through hole (31) for the first rod part (41) to pass through, and the diameter of the second rod part (42) is larger than that of the first through hole (31).

4. A prestressed expanding shell anchor according to claim 3, wherein said first through hole (31) is internally threaded and said extrusion block (3) is threadedly attached to said first shank portion (41).

5. The prestressed shell-expanding anchor rod as claimed in claim 1, further comprising a shell-expanding inner wedge (5), wherein said shell-expanding inner wedge (5) is provided with a connecting hole, said connecting hole is provided with an internal thread, said shell-expanding inner wedge (5) is connected to said first rod portion (41) by a thread, and the lower end of said shell-expanding inner wedge (5) is located between said shell-expanding pieces (1).

6. The prestressed shell-expanding anchor rod of claim 5, wherein the inner side surface of the shell-expanding sheet (1) comprises an inner ring surface (11) and an inner cone surface (12), the inner cone surface (12) is positioned on the upper side of the inner ring surface (11), the outer side surface of the shell-expanding inner wedge (5) is an outer cone surface (51), and the inner cone surface (12) is abutted to the outer cone surface (51).

7. The prestressed expanding shell anchor rod of claim 1, wherein the outer side surface of each expanding shell piece (1) is provided with an arc-shaped mounting groove (13), and the mounting grooves (13) are sequentially connected end to end; the shell expansion anchor rod further comprises a fastener (6), the fastener (6) is an anchor ear, notches are formed in the anchor ear, and the anchor ear is arranged in each mounting groove (13).

8. A prestressed expanding shell anchor rod as claimed in claim 1, wherein the outer side of each expanding shell piece (1) is provided with sawteeth arranged at continuous intervals.