Three-blade preset undercut anchor bolt and mounting and dismounting tool

Abstract

The three-blade preset undercut anchor bolt comprises a screw rod and a sleeve, and the screw rod is divided into an expansion section, a smooth section and a threaded section from bottom to top; the expansion section is in an inverted frustum shape, and the diameter of the expansion section is gradually increased in the direction from the threaded section to the bottom end of the screw. An expansion end is arranged at the bottom of the sleeve, a plurality of expansion valves are arranged at the expansion end, friction grooves and deformation grooves are formed in the outer sides of the expansion valves, and gaskets are arranged in the deformation grooves; the screw rod is inserted into the sleeve, the expansion section of the screw rod penetrates through the expansion end, and the expansion valve is in an opening shape; and a dismounting screw hole and a mounting groove are formed in the top of the sleeve. The friction grooves and the deformation grooves are formed in the outer sides of the expansion petals, the expansion petals can deform from the deformation grooves more easily during expansion, deformation of the sleeve is more controllable, the expansion petals can be opened more easily, and installation resistance is reduced; and the alloy blades are welded on the outer sides of the expansion valves, so that the anchor bolt can be mounted on a base material with higher hardness, and the mounting is more efficient and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of bolts, in particular to a three-blade preset bottom-cut anchor bolt and an installation and disassembly tool. Background Art

[0002] Self-cutting anchor bolts are widely used in building bridges and other projects. When using self-cutting anchor bolts, you need to first drill a hole on the surface to be fixed, put the anchor bolt into the hole, and then knock the sleeve so that the expansion blade head at the end of the sleeve cuts the bottom along the screw cone head to expand the hole. After expanding the hole, the self-cutting lock key of the self-cutting anchor bolt will open and form a tight lock key connection with the base material. The lock key connection can effectively resist external tension or shear force to ensure the stability and safety of the anchor bolt.

[0003] However, there are still some problems when using conventional self-cut bottom anchors. For example, ordinary percussion-type self-cut bottom anchors are inconvenient to install when encountering a relatively high hardness of the substrate. The cutting edge may not be able to be knocked into place, affecting the opening of the automatic lock key, making it impossible to install the anchor in place; and forcibly hammering it into place may also damage the cutting edge, causing the entire anchor to be scrapped, so that conventional self-cut bottom anchors still have various limitations. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a three-blade preset bottom-cutting anchor bolt and an installation and removal tool, which can improve the installation speed of the self-cutting bottom anchor bolt and can be applied to more different working conditions.

[0005] To this end, the technical solution of the utility model is: a three-blade preset bottom-cut anchor bolt, including a screw and a sleeve, the screw is divided into an expansion section, a smooth section and a threaded section from bottom to top; the expansion section is an inverted cone, and the diameter gradually increases from the threaded section to the bottom end of the screw; an expansion end is provided at the bottom of the sleeve, and a plurality of expansion petals are provided on the expansion end, friction grooves and deformation grooves are provided on the outer side of the expansion petals, and washers are provided in the deformation grooves; the screw is inserted into the sleeve, the expansion section of the screw passes through the expansion end, and the expansion petals are open; a disassembly screw hole and an installation groove are provided at the top of the sleeve.

[0006] On the basis of the above scheme and as a preferred scheme of the above scheme: the expansion petals are evenly distributed on the bottom of the sleeve, and alloy blades are welded on the outside of the expansion petals.

[0007] On the basis of the above scheme and as a preferred scheme of the above scheme: an inclined friction slope is provided on the friction groove.

[0008] On the basis of the above scheme and as a preferred scheme of the above scheme: a nylon washer is provided in the deformation groove, and the expansion flap squeezes the nylon washer during the deformation process.

[0009] On the basis of the above solution and as an optimized solution of the above solution: A marking line is provided on the screw. When the marking line is flush with the top of the sleeve, the expansion section of the screw crosses the expansion end of the sleeve.

[0010] On the basis of the above solution and as an optimized solution of the above solution: A knurled wire pressing line is provided on the sleeve.

[0011] Another technical solution of the present utility model is: The installation tool for the above three-edge preset undercut anchor bolt includes a connecting sleeve and an installation handle. An insertion block is provided on the connecting sleeve and can be inserted into the installation groove at the tail of the sleeve; The head of the installation handle is a hollow structure and is fixedly connected to the connecting sleeve. The installation handle is used in cooperation with a hammer drill.

[0012] Another technical solution of the present utility model is: The disassembly tool for the above three-edge preset undercut anchor bolt includes a disassembly connecting piece, a disassembly sleeve and a disassembly handle. The front end of the disassembly connecting piece faces the tail of the sleeve and is fixedly connected by bolts; The disassembly connecting piece is fixedly connected to the disassembly sleeve. An internal thread structure is provided inside the disassembly sleeve, and an external thread structure is provided on the outside of the disassembly handle. The disassembly sleeve is rotationally matched with the disassembly handle. By rotating the disassembly handle, the disassembly sleeve can be driven to drive the disassembly connecting piece and the sleeve to move.

[0013] On the basis of the above solution and as an optimized solution of the above solution: The disassembly connecting piece is a hollow structure for the head of the disassembly handle to pass through.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] 1. Friction grooves and deformation grooves are provided on the outer side of the expansion flap. A nylon washer is sleeved on the deformation groove. When the expansion flap expands, it is easier to deform from the deformation groove, making the deformation of the sleeve more controllable and the expansion flap easier to open, reducing the installation resistance. The nylon ring of the ferrule can also effectively improve the initial rigidity of the anchor bolt; At the same time, alloy blades are welded on the outer side of the expansion flap, enabling the anchor bolt to be installed on substrates with higher hardness, and the installation is more efficient and convenient.

[0016] 2. Knurled wire pressing is provided on the outside of the sleeve, which can make the sleeve fully extend into the installation hole. A marking line is provided on the screw, which can ensure that the anchor bolt is installed in place and can be clearly perceived by the user immediately.

[0017] 3. An installation tool is designed in a supporting manner, which can make the installation of the self-undercut anchor bolt more convenient, greatly improve the installation speed of the self-undercut anchor bolt, and at the same time reduce the defective rate that may occur during the installation of ordinary self-undercut anchor bolts. And because of the welding of the tool bit alloy sheet and the supporting special installation tool, the anchor bolt can be more widely applied and can be suitable for more different working conditions and occasions with different anchoring requirements.

[0018] 4. A disassembly tool is designed to cooperate with it. By using a disassembly handle and a disassembly sleeve with a threaded fit, the sleeve is pulled out to complete the disassembly of the anchor bolt. If there are special circumstances and the anchor bolt needs to be removed, the anchor bolt can be disassembled quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the present utility model;

[0020] Figure 2 is a structural schematic diagram of the screw rod of the present utility model;

[0021] Figure 3 is a structural schematic diagram of the sleeve of the present utility model;

[0022] Figure 4 is Figure 3 a partial enlarged view of;

[0023] Figure 5 is a bottom view of the structure of the sleeve of the present utility model;

[0024] Figure 6 is an installation schematic diagram of the present utility model;

[0025] Figure 7 is a structural schematic diagram of the installation tool of the present utility model;

[0026] Figure 8 is a structural schematic diagram of the disassembly tool of the present utility model;

[0027] Figure 9 is an exploded view of the parts of the disassembly tool of the present utility model.

[0028] The markings in the figure are:

[0029] screw rod 1, expansion section 11, smooth section 12, threaded section 13, marking line 14;

[0030] sleeve 2, expansion end 21, expansion flap 22, friction groove 23, deformation groove 24, nylon washer 25, alloy blade 26, knurling wire pressing 27, disassembly screw hole 28, installation groove 29;

[0031] nut 31, gasket 32;

[0032] installation tool 4, connecting sleeve 41, installation handle 42, insert block 43;

[0033] disassembly tool 5, disassembly connecting piece 51, disassembly sleeve 52, disassembly handle 53, external thread structure 54;

[0034] wall 6, fixture 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] In the description of the present utility model, it should be noted that for orientation terms, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and position relationship are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present utility model.

[0036] In addition, such terms as "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meanings of "several" and "a number of" are two or more, unless otherwise specifically and clearly defined.

[0037] Referring to the drawings. The three-edge preset undercut anchor bolt described in this embodiment includes a screw rod 1 and a sleeve 2. The screw rod 1 is divided into an expansion section 11, a smooth section 12, and a threaded section 13 from bottom to top; the threaded section 13 can be connected to the object to be fixed through a nut 31 and a gasket 32. The expansion section 11 is in the shape of an inverted frustum, and the diameter gradually increases from the threaded section 13 towards the bottom end of the screw rod 1. A marking line 14 is provided at a position of the smooth section 12 close to the threaded section 13. When the marking line 14 is flush with the top of the sleeve 2, the expansion section 11 of the screw rod 1 extends beyond the expansion end 21 of the sleeve 2.

[0038] The bottom of the sleeve 2 is provided with an expansion end 21. The expansion end 21 divides the lower end of the sleeve into a number of equal expansion petals 22 on average. There are two groove designs on the outside of the expansion petals 22. One is a friction groove 23, and there is a circumferential deep groove above the friction groove 23, which is a deformation groove 24. The expansion petals are more likely to deform from here during expansion, making the deformation of the sleeve more controllable and making the expansion petals easier to open, reducing the installation resistance. At the same time, a nylon washer 25 is sleeved on the deformation groove 24, making the anchor bolt have better rigidity performance.

[0039] In order to still maintain excellent cutting performance under high-strength base materials, three alloy blades 26 are welded on the outside of the expansion petals 22. Cooperating with a special installation tool 4, the expansion end 21 of the sleeve 2 can be cut and expanded along the expansion section 11 of the screw rod 1. The alloy blades 26 are evenly distributed teeth on the outside of the sleeve 2. After installation, the teeth can also make the lower end of the sleeve be in firm contact with the concrete hole wall and be fixed together, improving the firmness of the connection.

[0040] At a position above the outer side of the sleeve 2, there is a circumferentially knurled trace which is the knurled press line 27. During installation, when drilling a hole and placing the anchor bolt, if the knurled press line 27 does not pass through the concrete, it can be considered that the drilling is in place. Meanwhile, a disassembly screw hole 28 and an installation groove 29 are provided at the top of the sleeve 2.

[0041] Figure 7 As shown, an installation tool 4 is provided for the above-mentioned three-edge pre-set undercut anchor bolt. The installation tool 4 includes a connecting sleeve 41 and an installation handle 42. An insertion block 43 is provided on the connecting sleeve 41 and can be inserted into the installation groove 29 at the tail of the sleeve 2. The head of the installation handle 42 is of a hollow structure and is fixedly connected to the connecting sleeve 41. A structure for cooperating with an electric hammer is provided at the tail of the installation handle 42. Under the action of the electric hammer, the sleeve 2 of the anchor bolt can be driven to rotate, so that the expansion flaps 22 cut the wall.

[0042] Figure 8 、 9 As shown, a disassembly tool 5 is provided for the above-mentioned three-edge pre-set undercut anchor bolt. The disassembly tool 5 includes a disassembly connecting piece 51, a disassembly sleeve 52 and a disassembly handle 53. The front end of the disassembly connecting piece 51 faces the tail of the sleeve 2 and is fixedly connected to the disassembly screw hole 28 through a bolt. The disassembly connecting piece 51 is fixedly connected to the disassembly sleeve 52. The disassembly connecting piece 51 is of a hollow structure for the head of the disassembly handle 53 to pass through. An internal thread structure is provided in the disassembly sleeve 52, and an external thread structure 54 is provided on the outer side of the disassembly handle 53. The disassembly sleeve 52 is rotationally matched with the disassembly handle 53. By rotating the disassembly handle 53, the disassembly sleeve 52 can be driven to drive the disassembly connecting piece 51 and the sleeve 2 to move.

[0043] During installation, drill a straight hole for the self-undercut anchor bolt installation hole in the wall 6 according to the regulations, and there is no need to additionally ream the hole. Place the anchor bolt into the installation hole to ensure that the bottom of the screw rod 1 touches the bottom of the hole. At this time, the expansion section 11 of the screw rod 1 does not cross the expansion end 21 of the sleeve 2, and the expansion flaps 22 of the expansion end 21 are in a closed state and can be easily placed into the installation hole. Then insert the connecting sleeve 41 of the installation tool 4 into the installation groove 29 at the tail of the sleeve 2, and cooperate with the electric hammer to displace the sleeve 2 downward. Since the bottom expansion section 11 of the screw rod 1 is a conical shape, after the expansion flaps 22 descend to contact the expansion section 11, they will gradually deform and expand outward and expand around until they touch the hole wall. The expansion flaps 22 will continuously rotate under the work of the electric hammer and the installation tool, and the alloy blades 26 will cut and ream the hole wall. When all the lock keys are opened, the whole anchor bolt is stably connected by relying on the lock key effect. When the marking line at the screw rod 1 is flush with the end of the sleeve 2, it is considered that the anchor bolt is installed in place.

[0044] After being installed in place, the object to be fixed 7 and the anchor bolt are fixed together with the nut 31 and the gasket 32, and torque is applied to the nut 31. During the process of rotating and tightening the nut 31, the sleeve 2 and the screw rod 1 further generate relative displacement, so that the expansion flaps 22 on the sleeve 2 continue to expand, and the alloy blades 26 cut deeper into the concrete hole wall.

[0045] When removing the wire, align the disassembly connector 51 with the tail of the sleeve 2, and the bolt is fixedly connected to the disassembly screw hole 28 at the tail of the sleeve 2, so that the disassembly connector 51 and the sleeve 2 are fixed together. Then, fix the disassembly connector 51 and the disassembly sleeve 52 together, insert the disassembly handle 53 into the disassembly sleeve 52, and rotate the disassembly handle 53. Under the action of the thread, the disassembly sleeve 52 drives the disassembly connector 51 and the sleeve 2 to move outward, thus completing the disassembly work of the sleeve 2.

[0046] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A three-blade preset undercut anchor bolt, comprising a screw rod and a sleeve, characterized in that: The screw rod is divided into an expansion section, a smooth section and a threaded section from bottom to top; the expansion section is in the shape of an inverted frustum of a cone, and the diameter gradually expands from the threaded section towards the bottom end of the screw rod; the bottom of the sleeve is provided with an expansion end, and a plurality of expansion petals are arranged on the expansion end. Friction grooves and deformation grooves are arranged on the outer side of the expansion petals, and washers are arranged in the deformation grooves; the screw rod is inserted into the sleeve, and the expansion section of the screw rod passes through the expansion end, and the expansion petals are in an open state; a disassembly screw hole and an installation groove are arranged at the top of the sleeve.

2. The three-blade preset undercut anchor bolt according to claim 1, characterized in that: The expansion petals are evenly distributed at the bottom of the sleeve, and alloy blades are welded on the outer side of the expansion petals.

3. The three-edge preset undercut anchor bolt according to claim 1, characterized in that: An inclined friction slope is arranged on the friction groove.

4. The three-edge pre-set undercut anchor bolt according to claim 1, characterized in that: A nylon washer is arranged in the deformation groove, and the expansion petals squeeze the nylon washer during the deformation process.

5. The three-edge pre-set undercut anchor bolt according to claim 1, characterized in that: A marking line is arranged on the screw rod. When the marking line is flush with the top of the sleeve, the expansion section of the screw rod crosses the expansion end of the sleeve.

6. The three-blade preset undercut anchor bolt according to claim 1, characterized in that: A knurled wire pressing line is arranged on the sleeve.

7. An installation tool for the three-blade preset undercut anchor bolt according to any one of claims 1 to 6, characterized in that: It includes a connecting sleeve and an installation handle. An insertion block is arranged on the connecting sleeve and can be inserted into the installation groove at the tail of the sleeve; the head of the installation handle is of a hollow structure and is fixedly connected with the connecting sleeve, and the installation handle is used in cooperation with a hammer drill.

8. A disassembly tool for the three-edge preset undercut anchor bolt according to any one of claims 1 to 6, characterized in that: It includes a disassembly connecting piece, a disassembly sleeve and a disassembly handle. The front end of the disassembly connecting piece faces the tail of the sleeve and is fixedly connected by bolts; the disassembly connecting piece is fixedly connected with the disassembly sleeve. The disassembly sleeve is provided with an internal thread structure, and the outer side of the disassembly handle is provided with an external thread structure. The disassembly sleeve is rotationally matched with the disassembly handle. By rotating the disassembly handle, the disassembly sleeve can be driven to drive the disassembly connecting piece and the sleeve to move.

9. The disassembling tool according to claim 8, characterized in that: The disassembly connecting piece is of a hollow structure for the head of the disassembly handle to pass through.

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