Shockproof anchor bolt

Abstract

The present invention discloses an anti-seismic anchor bolt, comprising an inner screw and a cutting tube sleeved on the outer periphery of the inner screw, an expansion cone piece is provided at one end of the inner screw, a thread is provided on the outer periphery of a part of the inner screw near the other end thereof to form an outer thread section, and a portion of the inner screw between the expansion cone piece and the outer thread section is a non-thread section; a plurality of longitudinal cracks are provided at the inner end of the cutting tube, and the portion between two adjacent cracks forms an expansion piece; screw teeth are provided on the inner side surface of the outer end of the cutting tube, and when the cutting tube is sleeved on the inner screw, the screw teeth of the cutting tube are meshed and connected with the outer thread section of the inner screw. The present invention has the functions of simple structure, low manufacturing cost, anti-loosening, anti-fool, easy disassembly and anti-seismic.

Description

Technical Field

[0001] The invention relates to an anchor bolt, in particular to a shockproof anchor bolt. Background Art

[0002] Anchor bolts or embedded parts, the most convenient to install are expansion anchor bolts and chemical anchor bolts. Expansion anchor bolts use the relative movement of cone and expansion sheet (or expansion sleeve) to make the expansion sheet expand radially. After expansion, it will produce expansion squeeze with the hole wall (concrete), and generate friction between the expansion sheet and the hole wall until the friction force and the axial pulling force of the connecting part on the anchor bolt are balanced, thus achieving the fixing of the connected part and the concrete. Chemical anchor bolts are a component that adds chemical agents and the like into the straight hole, and then inserts the screw rod. After curing, the chemical agent and the screw rod are cured into one in the straight hole and form friction with the hole wall. The connected part is then fixed with the screw rod, thus achieving the fixing of the connected part and the concrete. However, the existing expansion anchor bolts and chemical anchor bolts also have some defects.

[0003] Firstly, expansion anchors have the following defects: the expansion plate squeezes the concrete hole wall, which is prone to concrete cracking and destroying the strength of the original building; it is only suitable for places where the hole center is not less than 7 times the anchor diameter from the edge of the building, places where the concrete is not cracked, places where the force is small, and places without vibration (the concrete hole wall rubs against the expansion plate during vibration, causing the friction plate to wear and become loose, which may cause major safety hazards and accidents); it is unable to meet large depth requirements; the friction plate (tube) is not easy to self-lock and loosen; and it is difficult to disassemble after installation.

[0004] Secondly, chemical anchors have the following defects: safety issues related to drug failure; they cannot be put into use immediately; and they are not suitable for places with vibration (the vibration causes friction between the concrete hole wall and the solidified agent and causes it to loosen, thus causing major safety hazards and accidents).

[0005] Furthermore, there is also a kind of embedded anchor bolt (groove) which also has some defects: large workload of preliminary design; large deviation, relatively high investment in construction; long construction period due to equipment displacement and re-excavation of foundation; high cost of auxiliary tooling. Summary of the invention

[0006] In order to overcome the above defects, the present invention provides a shockproof anchor bolt, which not only has the function of preventing loosening and fooling, but also is easy to disassemble.

[0007] The technical solution adopted by the present invention to solve its technical problems is: an anti-seismic anchor bolt, including an inner screw and a cutting tube sleeved on the outer periphery of the inner screw, one end of the inner screw is provided with an expansion cone, the outer periphery of a part of the inner screw close to the other end is provided with a thread to form an external thread section, and the part of the inner screw located between the expansion cone and the external thread section is a non-threaded section; the inner end of the cutting tube is provided with a plurality of longitudinal cracks, and the part between two adjacent cracks forms an expansion sheet; the inner side surface of the outer end of the cutting tube is provided with screw threads, and when the cutting tube is sleeved on the inner screw, the screw threads of the cutting tube are meshed and connected with the external thread section of the inner screw.

[0008] As a further improvement of the present invention, a hexagonal screw hole is provided on the end surface of the other end of the inner screw.

[0009] As a further improvement of the present invention, the distance between the inner end of the cutting tube and the thread is greater than the length of the non-threaded section of the internal screw.

[0010] As a further improvement of the present invention, threaded threads are provided on corresponding partial areas of two opposite inner side surfaces of the cutting tube.

[0011] As a further improvement of the present invention, the screw thread is a plurality of protruding structures arranged along the axial direction of the cutting tube.

[0012] As a further improvement of the present invention, a second groove is provided on the outer end surface of the cutting tube.

[0013] As a further improvement of the present invention, a layer of corundum is electroplated on the surface of the expansion sheet.

[0014] As a further improvement of the present invention, the screw thread is a half screw thread.

[0015] The beneficial effects of the present invention are as follows: (1) When the seismic anchor bolt is installed in a straight hole in concrete, the pair of threads provided on the cutting tube and the effective threaded section on the inner screw rod are stably engaged (in the stage of the expansion piece forming a cone when engaged), so that the relative positional relationship between the two is stable and will not move, thereby preventing the cutting piece (cutting tube) from rebounding. Thus, the anchor bolt has anti-loosening performance. When fixing the workpiece, there is no need for the workpiece surface or gasket to press the end of the cutting piece (tube).

[0016] (2) When installing in a straight hole in concrete, the expansion piece rotates at high speed while opening, cutting the bottom of the hole wall into a conical surface. When pulling, the conical surface of the expansion piece (tube) and the conical surface of the conical hole fully cooperate to generate a force (pressure), which has the strength of pre-embedded and earthquake-resistant function;

[0017] (3) When L1 is 0, that is, when the thread moves to the thread end in the middle of the screw, if the installation tool continues to work, the cutting tube will not produce axial displacement on the inner screw due to the non-threaded section on the inner screw, and the expansion piece will not continue to open, ensuring the consistent formation of the conical surface, thereby preventing the expansion piece from opening excessively and damaging the installation tool, thus playing a role in protecting the installation tool;

[0018] (3) According to the pull-out force requirements of the fixed object, the expansion angle of the anchor bolt can be kept consistent by setting a consistent length of the external thread section, thereby preventing manual installation from being in place, ensuring the quality of all installations, and having a fool-proof effect.

[0019] (4) The anti-seismic anchor bolt is rotated in the reverse direction by the tool. The expansion (sheet) tube (with elasticity) can be returned to its original position due to re-engagement, and the anchor bolt can be smoothly taken out, making disassembly convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 is a three-dimensional diagram of the cutting tube of the present invention;

[0022] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A;

[0023] Figure 4 is a perspective view of a cutting tube according to the present invention;

[0024] Figure 5 A three-dimensional diagram of the inner screw of the present invention;

[0025] Figure 6 It is a perspective view of the internal screw of the present invention.

[0026] Figure 7 for Figure 1 A perspective of status;

[0027] Figure 8 It is a stereoscopic diagram of the expanded state of the present invention;

[0028] Fig. 9 This is a state diagram of the cutting tube of the present invention when it is expanded;

[0029] Fig.10 for Figure 8 Status perspective.

[0030] Combined with the attached drawings, the following description is given:

[0031] 1——internal screw; 2——cutting tube;

[0032] 101——expansion cone; 102——unthreaded section;

[0033] 103——External thread section; 104——Hexagon socket screw hole;

[0034] 201——crack; 202——expansion sheet;

[0035] 203——screw thread; 204——second groove. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0037] See also Figure 1-10 , is a seismic anchor bolt according to the present invention, comprising an inner screw 1 and a cutting tube 2 sleeved on the outer periphery of the inner screw 1. An expansion cone 101 is provided at one end of the inner screw 1, a portion of the outer periphery of the inner screw 1 near the other end thereof is provided with a threaded outer thread section 103, a portion of the inner screw 1 between the expansion cone 101 and the outer thread section 103 is a non-threaded section 102, and an inner hexagonal screw hole 104 is provided on the end surface of the other end of the inner screw 1.

[0038] The inner end of the cutting tube 2 is provided with a plurality of longitudinal cracks 201 (i.e. working openings), and the portion between two adjacent cracks forms an expansion sheet 202 (i.e. working surface); a second groove 204 is provided on the outer end surface of the cutting tube 2.

[0039] The inner side surface of the outer end of the cutting tube 2 is provided with screw threads 203, which can be arranged on two opposite inner sides of the cutting tube 2. The screw threads 203 are preferably half screw threads, which can be a plurality of protrusions arranged along the axial direction of the cutting tube 2. A layer of corundum or corundum particles is electroplated on the surface of the expansion sheet.

[0040] When the cutting tube 2 is sleeved on the inner screw 1, the thread 203 of the cutting tube 2 is meshed with the outer thread section 103 of the inner screw 1. The distance between the expansion piece 202 of the cutting tube 2 and the thread 203 is greater than the length of the non-thread section 102 of the inner screw 1.

[0041] See also Figure 7 and 10 , assuming that the distance between the thread 203 and the end of the external thread section 103 close to 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 piece 101 is L2. The working principle of the present invention is described in detail below with reference to the accompanying drawings.

[0042] See also Figure 1, is a schematic diagram of the non-working state of the present invention. At this time, the expansion piece 202 of the cutting tube 2 is located outside the portion corresponding to the non-threaded section 102 of the inner screw 1, that is, the expansion piece 202 is in an unexpanded state. When in use, the inner end of the present invention, i.e., the expansion end, is inserted into a straight hole in the concrete, and is respectively inserted into the inner hexagonal screw hole on the inner screw 1 and the second protrusion on the outer end of the cutting tube through a corresponding special installation tool, such as a manual turntable or an electric turntable, to drive the inner screw 1 and the cutting tube 2 to rotate respectively. The rotation speed of the inner screw 1 is low, and the rotation speed of the cutting tube 2 is high. Through the meshing of the screw teeth 203 and the screw teeth 103, due to the difference in rotation speeds, the inner screw 1 moves axially outward relative to the cutting tube 2. While moving, the expansion piece at the inner end of the cutting tube 2 expands and cracks along the crack on the cutting tube under the action of the expansion cone piece 101 at the inner end of the inner screw 1, and expands and rotates through the working edge (crack 201) and the working surface (expansion piece 202) to cut the bottom hole of the concrete (rebar stone) to form a conical hole. The cutting tube 2 is formed Figure 8 and 9 The expansion sheet is cracked and fixed in the conical hole just cut to achieve product fixation.

[0043] The advantages of the present invention are as follows:

[0044] (1) After the anti-vibration bolt is tightened, the pair of threads on the cutting tube and the threaded section on the inner screw always maintain a stable meshing connection, so that the relative position relationship between the two is stable and not easy to move, thereby having a loosening performance and an anti-vibration function formed by rotating and opening while cutting the conical surface;

[0045] (2) When L1 is 0, that is, when the thread moves to the end of the thread end, if the installation tool continues to work at this time, due to the non-threaded section on the inner screw, the cutting tube will idle on the inner screw, indicating that the installation is in place and all the taper angles are consistent. This prevents the risk of different workers installing differently and prevents excessive damage to the installation tool, thus playing a role in protecting the installation tool;

[0046] (3) According to the pull-out force requirements of the fixed object, the expansion angle of the anchor bolt can be kept consistent by setting a consistent length of the external thread section, thereby preventing manual installation from being in place, ensuring the quality of all installations, and having a fool-proof effect.

[0047] (4) The anti-seismic anchor bolt is rotated in the reverse direction by the tool. The expansion (sheet) tube (with elasticity) can be returned to its original position due to re-engagement, and the anchor bolt can be smoothly taken out, making disassembly convenient.

[0048] It can be seen that the present invention has the advantages of simple structure, low manufacturing cost, anti-loosening and anti-foolproofing, strength of embedded parts, easier disassembly, and especially excellent anti-seismic function.

[0049] Many specific details are described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person familiar with the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A seismic anchor bolt, characterized in that: The invention comprises an inner screw (1) and a cutting tube (2) sleeved on the outer circumference of the inner screw (1), wherein one end of the inner screw is provided with an expansion cone (101), a portion of the outer circumference of the inner screw near the other end is provided with a thread forming an outer thread section (103), and a portion of the inner screw located between the expansion cone (101) and the outer thread section (103) is a non-thread section (102); the inner end of the cutting tube (2) is provided with a plurality of longitudinal cracks (201), and the portion between two adjacent cracks forms an expansion sheet (202); the inner side surface of the outer end of the cutting tube (2) is provided with screw threads (203), and the inner side surface of the outer end of the cutting tube (2) is provided with screw threads (203). When the cutting tube (2) is sleeved on the inner screw, the thread (203) of the cutting tube (2) is meshedly connected with the outer thread section (103) of the inner screw (1); a hexagonal screw hole (104) is provided on the end surface of the other end of the inner screw (1); the distance between the inner end of the cutting tube (2) and the thread (203) is greater than the length of the non-thread section (102) of the inner screw (1); thread (203) is provided on corresponding partial areas on two opposite inner side surfaces of the cutting tube (2); and the thread (203) is a plurality of protruding structures arranged along the axial direction of the cutting tube (2).

2. The earthquake-proof anchor bolt according to claim 1, characterized in that: A second groove (204) is provided on the outer end surface of the cutting tube (2).

3. The earthquake-proof anchor bolt according to claim 1, characterized in that: A layer of corundum is electroplated on the surface of the expansion sheet.

4. The earthquake-proof anchor bolt according to claim 1, characterized in that: The screw thread is a half screw thread.

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