CN114321125A - Shockproof anchor bolt - Google Patents

Abstract

The invention discloses a shockproof anchor bolt which comprises an inner screw rod and a cutting pipe sleeved on the periphery of the inner screw rod, wherein an expansion conical sheet is arranged at one end of the inner screw rod, a thread is arranged on the periphery of one part of the inner screw rod, which is close to the other end of the inner screw rod, to form an external thread section, and the part of the inner screw rod, which is positioned between the expansion conical sheet and the external thread section, is a non-threaded section; the inner end of the cutting pipe is provided with a plurality of longitudinal cracks, and an expansion sheet is formed at the part between two adjacent cracks; the inner side surface of the outer end of the cutting pipe is provided with threads, and when the cutting pipe is sleeved on the inner screw rod, the threads of the cutting pipe are in meshed connection with the outer thread section of the inner screw rod. The invention has the advantages of simple structure, low manufacturing cost, looseness prevention, fool prevention, convenient disassembly, shock resistance and the like.

Description

Shockproof anchor bolt

Technical Field

The invention relates to an anchor bolt, in particular to a shockproof anchor bolt.

Background

The expansion anchor bolt or the embedded part is mostly an expansion anchor bolt and a chemical anchor bolt which are most convenient to install, the expansion anchor bolt utilizes the relative movement of a cone and an expansion sheet (or an expansion sleeve) to promote the expansion sheet to radially expand, the expansion sheet and the hole wall (concrete) generate expansion extrusion after expansion, friction force is generated between the expansion sheet and the hole wall until friction force and axial pulling force of the connecting piece to the anchor bolt are balanced, and the component fixed by the connecting piece and the concrete is realized. The chemical anchor bolt is an assembly which is formed by adding chemical agents and the like into a straight hole, inserting a screw rod into the straight hole, solidifying the chemical agents and the screw rod into a whole in the straight hole to form friction force with the wall of the straight hole, and fixing the chemical agents and the screw rod by a connecting piece to realize the fixation of the connecting piece and concrete. However, the known expansion anchors and chemical anchors, respectively, also have some disadvantages.

Firstly, expansion anchors have the following disadvantages: the expansion sheet extrudes the wall of the concrete hole, so that the concrete is easy to crack, and the strength of the original building is damaged; the method is only suitable for places with hole centers not less than 7 times of the diameter of the anchor bolt from the edge of a building, places with no cracking of concrete, places with small acting force and places without vibration (the friction plates are abraded and loosened by the friction expansion plate of the concrete hole wall in vibration, so that the friction plates are loosened to cause serious potential safety hazards and accidents due to the loosening); the requirement of large depth cannot be fulfilled; the friction plate (tube) is not easy to self-lock and release; and is difficult to disassemble after installation.

Secondly, chemical anchors have the following disadvantages: safety issues of drug failure; can not be put into use immediately; and (3) no vibration place (the wall of the concrete hole and the solidified agent generate friction and loosen in vibration, so that serious potential safety hazard and accidents occur).

Furthermore, a fastener (slot) has some drawbacks: the early design workload is large; the deviation is large, and the investment on construction is high; equipment is shifted to excavate the foundation again, and the construction period is long; the auxiliary tool is high in cost.

Disclosure of Invention

In order to overcome the defects, the invention provides the shockproof anchor bolt which not only has the functions of loosening prevention and fool prevention, but also is easy to disassemble.

The technical scheme adopted by the invention for solving the technical problem is as follows: a shockproof anchor bolt comprises an inner screw rod and a cutting pipe sleeved on the periphery of the inner screw rod, wherein an expansion conical sheet is arranged at one end of the inner screw rod, a thread is arranged on the periphery of one part of the inner screw rod, which is close to the other end of the inner screw rod, to form an outer thread section, and the part of the inner screw rod, which is positioned between the expansion conical sheet and the outer thread section, is a non-thread section; the inner end of the cutting pipe is provided with a plurality of longitudinal cracks, and an expansion sheet is formed at the part between two adjacent cracks; the inner side surface of the outer end of the cutting pipe is provided with threads, and when the cutting pipe is sleeved on the inner screw rod, the threads of the cutting pipe are in meshed connection with the outer thread section of the inner screw rod.

As a further improvement of the invention, the end face of the other end of the inner screw is provided with an inner hexagonal screw hole.

As a further development of the invention, the distance between the inner end of the cutting tube and the thread is greater than the length of the unthreaded section of the inner screw.

As a further improvement of the invention, the cutting tube is provided with screw threads on corresponding partial areas on two opposite inner side surfaces.

As a further improvement of the invention, the thread is a plurality of convex structures which are arranged along the axial direction of the cutting pipe.

As a further improvement of the invention, the outer end face of the cutting pipe is provided with a second groove.

As a further improvement of the invention, the surface of the expansion sheet is electroplated with a layer of carborundum.

As a further improvement of the invention, the screw thread is a half screw thread.

The invention has the beneficial effects that: (1) when the shockproof anchor bolt is installed in a concrete straight hole, because a pair of screw teeth arranged on the cutting pipe and the effective thread section on the inner screw rod are stably meshed (in the stage of tapering the expansion sheet during meshing), the relative position relation between the pair of screw teeth and the effective thread section is stable, the shockproof anchor bolt cannot move, and the cutting sheet (the cutting pipe) is prevented from rebounding. Thereby having anti-loosening performance. The workpiece is secured without the workpiece face or the shim pressing against the end of the cutting blade (tube).

(2) When the expansion sheet is installed in a concrete straight hole, the expansion sheet is opened while rotating at a high speed, so that the bottom of the hole wall is cut to form a conical surface. When drawing, the conical surface of the expansion sheet (pipe) and the conical surface of the conical hole are completely matched to generate acting force (pressure), and the pre-buried strength and the anti-seismic function are achieved;

(3) when the L1 is 0, namely when the screw teeth move to the tail end of the screw thread in the middle of the screw rod, if the mounting tool continues to work at the moment, because the thread-free section on the inner screw rod is arranged, the cutting pipe cannot generate axial displacement on the inner screw rod, the expansion sheet cannot continue to be expanded, and the conical surface is ensured to be formed consistently, so that the mounting tool is prevented from being damaged due to the excessive expansion of the expansion sheet, and the effect of protecting the mounting tool is achieved;

(3) according to the requirement of the drawing force of a fixed object, the length of the external thread section can be set to be consistent, so that the expansion angle of the anchor bolt is kept consistent, manual installation is prevented from being out of place, all installation qualities are guaranteed, and the fool-proof effect is achieved.

(4) Through the shockproof crab-bolt of instrument counter rotation, owing to the meshing can be with inflation (piece) pipe (having elasticity) return once more, take out the crab-bolt smoothly, it is convenient to dismantle.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a perspective view of the cutting tube of the present invention;

FIG. 3 is an enlarged view of the portion A of FIG. 2;

FIG. 4 is a perspective view of a cutting tube according to the present invention;

FIG. 5 is a perspective view of a screw according to the present invention;

FIG. 6 is a perspective view of the inner screw of the present invention.

FIG. 7 is a perspective view of the condition of FIG. 1;

FIG. 8 is a perspective view of the invention in an expanded state;

FIG. 9 is a view showing the state of the cut tube of the present invention when expanded;

fig. 10 is a perspective view of the state of fig. 8.

The following description is made with reference to the accompanying drawings:

1-an internal screw rod; 2-cutting the pipe;

101-expansion cone sheet; 102-no thread segment;

103-external thread section; 104-hexagonal socket head cap screw;

201-crack; 202-expansion sheet;

203-screw thread; 204 — second groove.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 10, the anchor bolt according to the present invention includes an inner screw 1 and a cutting pipe 2 sleeved on an outer circumference of the inner screw 1. An expansion cone sheet 101 is arranged at one end of the internal screw 1, an external thread section 103 formed by threads is arranged on the periphery of a part of the internal screw 1 close to the other end of the internal screw, a part of the internal screw 1 between the expansion cone sheet 101 and the external thread section 103 is a non-thread section 102, and an inner hexagonal screw hole 104 is arranged on the end surface of the other end of the internal screw 1.

The inner end of the cutting pipe 2 is provided with a plurality of longitudinal cracks 201 (namely working openings), and the part between two adjacent cracks forms an expansion sheet 202 (namely a working surface); the outer end face of the cutting pipe 2 is provided with a second groove 204.

The inner side surface of the outer end of the cutting pipe 2 is provided with threads 203 which can be arranged on two opposite inner side surfaces of the cutting pipe 2, the threads 203 are preferably half threads, and the threads can be a plurality of protruding structures which are arranged along the axial direction of the cutting pipe 2. The surface of the expansion sheet is electroplated with a layer of carborundum or carborundum particles.

When the cutting pipe 2 is sleeved on the internal screw rod 1, the thread 203 of the cutting pipe 2 is engaged with the external thread section 103 of the internal screw rod 1. Wherein the distance between the expansion sheet 202 and the thread 203 of the cutting tube 2 is greater than the length of the unthreaded section 102 of the inner screw 1.

Referring to fig. 7 and 10, it is assumed that the distance between the thread 203 and the end of the external thread section 103 near the expansion tube is L1, and the distance between the inner end surface of the cutting tube 2 (i.e., the end of the expansion piece) and the inner end surface of the expansion cone 101 is L2. The working principle of the present invention is explained in detail below with reference to the accompanying drawings.

Referring to fig. 1, which is a schematic view illustrating a non-operating state of the present invention, the expansion piece 202 of the cutting pipe 2 is located outside a portion corresponding to the unthreaded section 102 of the internal screw 1, i.e., the expansion piece 202 is in an unexpanded state. When the tool is used, the inner end, namely the expansion end, of the tool is inserted into a concrete straight hole, the inner screw 1 and the cutting pipe 2 are driven to rotate respectively through corresponding special mounting tools, such as a manual rotating tool or an electric rotating tool, which are respectively inserted into an inner hexagonal screw hole in the inner screw 1 and a second bulge at the outer end of the cutting pipe, the rotating speed of the inner screw 1 is low, the rotating speed of the cutting pipe 2 is high, the inner screw 1 moves outwards and axially relative to the cutting pipe 2 through meshing of the screw teeth 203 and the screw teeth 103 due to the difference of the rotating speeds of the two, and when the inner screw moves, an expansion sheet at the inner end of the cutting pipe 2 expands and cracks along a crack on the cutting pipe under the action of an expansion cone sheet 101 at the inner end of the inner screw 1, and a bottom hole of concrete (a steel bar stone) is cut through rotation of a working surface (an expansion sheet 202) at a working edge (crack 201) to form a tapered hole. The cutting pipe 2 is formed into the state shown in fig. 8 and 9, and the expansion sheet is fixed in the conical hole which is just cut after being split, so that the product is fixed.

The invention has the following advantages:

(1) after the shockproof bolt is screwed, because the pair of screw threads arranged on the cutting pipe and the screw thread section on the inner screw rod are always stably meshed and connected, the relative position relationship between the pair of screw threads and the screw thread section is stable, and the shockproof bolt is not easy to move, so that the shockproof bolt has the loosening performance and has the shockproof function formed by self-cutting a conical surface while rotating and opening;

(2) when L1 is 0, i.e. when the thread is moved to the end of the threaded end, and the setting tool continues to work, the cutting tube will idle on the inner screw due to the arrangement of the unthreaded section on the inner screw, indicating that the setting is in place and ensuring consistency of all taper angles. Thereby preventing different workers from mounting different risks, preventing the mounting tool from being damaged due to excessive mounting, and playing a role in protecting the mounting tool;

(3) according to the requirement of the drawing force of a fixed object, the length of the external thread section can be set to be consistent, so that the expansion angle of the anchor bolt is kept consistent, manual installation is prevented from being out of place, all installation qualities are guaranteed, and the fool-proof effect is achieved.

(4) Through the shockproof crab-bolt of instrument counter rotation, owing to the meshing can be with inflation (piece) pipe (having elasticity) return once more, take out the crab-bolt smoothly, it is convenient to dismantle.

Therefore, the anti-loosening and anti-fool embedded part has the advantages of simple structure, low manufacturing cost, looseness prevention, fool prevention, embedded part strength, convenience in disassembly, particularly excellent anti-seismic function and the like.

In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. The foregoing description is only a preferred embodiment of the invention, which can be embodied in many different forms than described herein, and therefore the invention is not limited to the specific embodiments disclosed above. And that those skilled in the art may, using the methods and techniques disclosed above, make numerous possible variations and modifications to the disclosed embodiments, or modify equivalents thereof, without departing from the scope of the claimed embodiments. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims (8)

1. A shockproof anchor bolt is characterized in that: the cutting device comprises an internal screw (1) and a cutting pipe (2) sleeved on the periphery of the internal screw (1), wherein an expansion conical sheet (101) is arranged at one end of the internal screw, a thread forming external thread section (103) is arranged on the periphery of one part of the internal screw close to the other end of the internal screw, and a part of the internal screw between the expansion conical sheet (101) and the external thread section (103) is a non-thread section (102); the inner end of the cutting pipe (2) is provided with a plurality of longitudinal cracks (201), and expansion sheets (202) are formed between every two adjacent cracks; the inner side surface of the outer end of the cutting pipe (2) is provided with threads (203), when the cutting pipe (2) is sleeved on the inner screw rod, the threads (203) of the cutting pipe (2) are connected with the outer thread section (103) of the inner screw rod (1) in a meshing manner.

2. The shock-resistant anchor as set forth in claim 1, wherein: an inner hexagonal screw hole (104) is formed in the end face of the other end of the inner screw (1).

3. The shock-resistant anchor as set forth in claim 1, wherein: the distance between the inner end of the cutting pipe (2) and the thread (203) is greater than the length of the unthreaded section (102) of the inner screw (1).

4. The shock-resistant anchor as set forth in claim 1, wherein: and screw teeth (203) are arranged on corresponding partial areas on two opposite inner side surfaces of the cutting pipe (2).

5. Anti-vibration anchor according to claim 4, characterized in that: the thread (203) is of a plurality of protruding structures which are arranged along the axial direction of the cutting pipe (2).

6. The shock-resistant anchor as set forth in claim 1, wherein: and a second groove (204) is arranged on the end surface of the outer end of the cutting pipe (2).

7. The shock-resistant anchor as set forth in claim 1, wherein: and a layer of carborundum is electroplated on the surface of the expansion sheet.

8. The shock-resistant anchor as set forth in claim 1, wherein: the screw teeth are half screw teeth.

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