Two-blade preset type undercut anchor bolt and dismounting tool thereof

Abstract

The two-blade preset type undercut anchor bolt comprises a screw rod and a sleeve, and an expansion section, a smooth section and a threaded section are sequentially arranged on the screw rod; 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. A lock key is arranged at the bottom of the sleeve, a plurality of expansion valves are arranged on the lock key, friction grooves and deformation grooves are formed in the outer sides of the expansion valves, friction ribs and deformation limiting grooves are arranged on the friction grooves, 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; the top of the sleeve is provided with a dismounting bayonet and a mounting groove. The friction groove and the deformation groove are formed in the outer side of the lock key, the friction rib can increase friction force and strength of the expansion valve, the deformation groove enables deformation of the sleeve to be more controllable, the lock key is easier to open, installation resistance is reduced, and the nylon ring is matched with the deformation limiting groove to enable opening of the lock key to be more controllable.

Description

Technical Field

[0001] This utility model relates to the field of bolt technology, and in particular to a two-bladed pre-cut bottom anchor bolt and its disassembly tool. Background Technology

[0002] Self-cutting anchors are widely used in building bridges and other engineering projects. When using a self-cutting anchor, a hole needs to be drilled in the surface to be fixed. The anchor is then inserted into the hole, and the sleeve is struck to cause the expansion flap at the end of the sleeve to cut and enlarge the hole along the screw's tapered head. After enlarging the hole, the self-cutting key of the anchor will open, forming a tight keyed connection with the foundation material. This keyed connection effectively resists external tensile or shear forces, ensuring the stability and safety of the anchor.

[0003] However, conventional self-cutting anchors still have some problems in use. For example, ordinary hammer-type self-cutting anchors are inconvenient to install when the substrate hardness is relatively high. The cutting edge may not be able to be hammered in place, affecting the opening of the automatic locking key and making it impossible to install the anchor properly. Forcing it into place may also damage the cutting edge, rendering the entire anchor unusable. Thus, conventional self-cutting anchors still have various limitations. Utility Model Content

[0004] To address the aforementioned issues, this invention provides a two-bladed pre-cut bottom anchor and its disassembly tool, which can improve the installation speed of self-cut bottom anchors and is applicable to a wider range of working conditions.

[0005] Therefore, the technical solution of this utility model is: a two-bladed pre-cut bottom anchor bolt, including a screw and a sleeve, wherein the screw is provided with an expansion section, a smooth section and a threaded section in sequence; the expansion section is shaped like an inverted frustum, and the diameter gradually increases from the threaded section to the bottom end of the screw; the bottom of the sleeve is provided with a locking key, and the locking key is provided with multiple expansion petals, the outer side of the expansion petals is provided with a friction groove and a deformation groove, and the friction groove is provided with a friction rib and a deformation limiting groove, and a washer is provided in the deformation groove; the screw is inserted into the sleeve, the expansion section of the screw passes through the expansion end, and the expansion petals are open; the top of the sleeve is provided with a disassembly latch and an installation groove.

[0006] Based on the above scheme and as a preferred embodiment of the above scheme: the expansion flaps are evenly distributed at the bottom of the sleeve, and two alloy blades are welded to the outside of the expansion flaps.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme: the friction groove is provided with an inclined friction slope, the friction slope is provided with two protruding friction ribs, and an inwardly recessed deformation limiting groove.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme: a nylon gasket is provided in the deformation groove, and the expansion flap squeezes the nylon gasket during the deformation process.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: a marking line is provided on the screw, and when the marking line is higher than the top of the sleeve, the expansion section of the screw passes over the locking key of the sleeve.

[0010] Based on the above scheme and as a preferred option: the sleeve is provided with a knurled embossing line, which is the anchor bolt burial depth line.

[0011] Another technical solution of this utility model is: the disassembly tool for the above-mentioned double-edged pre-cut bottom anchor bolt includes a disassembly cylinder, a disassembly rod, and a disassembly handle. The front end of the disassembly cylinder is provided with a buckle, which is connected to the disassembly slot at the top of the sleeve and is fixed by a top rod. The disassembly cylinder has a hollow structure, and the head of the disassembly rod is inserted into the disassembly cylinder, and the two are threaded together. The tail end of the disassembly rod is connected to the disassembly handle, and the disassembly handle can drive the disassembly cylinder and the sleeve to move outward through the disassembly rod.

[0012] Based on the above scheme and as a preferred embodiment of the above scheme: a fixed sleeve is provided on the outside of the disassembly cylinder, the bottom end of the top rod is placed inside the fixed sleeve, and the top end abuts against the buckle; a limiting ring, a spring and a bottom ring are provided inside the fixed sleeve, the bottom ring is fixed inside the fixed sleeve by a limiting screw, the spring is placed above the bottom ring, the limiting ring is placed above the spring and abuts against the bottom end of the top rod.

[0013] Based on the above scheme and as a preferred embodiment of the above scheme: the front end of the buckle is L-shaped and engages with the disassembly slot of the sleeve.

[0014] Based on the above scheme and as a preferred embodiment of the above scheme: the tail of the disassembly rod is provided with an external hexagonal structure, and the disassembly handle is provided with an internal hexagonal structure, and the two are connected and cooperated.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The locking key is equipped with a friction groove and a deformation groove on its outer side. The friction groove has friction ribs and a deformation limiting groove. The friction ribs can increase the friction force and the strength of the expansion valve. The deformation groove is fitted with a nylon ring, which makes it easier for the locking key to deform from the deformation groove when it opens. This makes the deformation of the sleeve more controllable and the locking key easier to open, reducing installation resistance. The nylon ring, together with the deformation limiting groove on the friction groove, makes the opening of the locking key more controllable. The nylon ring also plays a certain positioning role, reducing the early wear between the locking key and the sleeve. The nylon ring can also effectively improve the early rigidity of the anchor bolt. At the same time, an alloy sheet is welded to the outside of the locking key, which allows the anchor bolt to be installed on a substrate with higher hardness, making the installation more efficient and convenient.

[0017] 2. Knurled lines are set on the outside of the sleeve, so that the depth of the mounting hole can be clearly seen during installation; marking lines are set on the screw to ensure that the anchor bolt is installed in place and can be clearly seen by the user immediately.

[0018] 3. A disassembly tool is included. Using a threaded disassembly sleeve and disassembly rod with a connecting handle, the sleeve can be pulled out to disassemble the anchor bolt. If special circumstances require the anchor bolt to be removed, it can be removed quickly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the screw structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the sleeve of this utility model;

[0022] Figure 4 for Figure 3 A magnified view of a portion of the image;

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

[0024] Figure 6 This is an installation diagram of the present invention;

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

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

[0027] Figure 9 This is an exploded view of the parts of the disassembly tool of this utility model;

[0028] Figure 10 This is a cross-sectional view of the disassembly tool of this utility model.

[0029] The markings in the diagram are as follows: Screw 1, Expansion Section 11, Smooth Section 12, Threaded Section 13, Marking Line 14, Sleeve 2, Locking Key 21, Expansion Flange 22, Friction Groove 23, Friction Rib 24, Deformation Limiting Groove 25, Deformation Groove 26, Nylon Washer 27, Alloy Blade 28, Knurled Line 29, Disassembly Bay 210, Mounting Groove 211; Nut 31, Washer 32.

[0030] Installation tool 4, connecting sleeve 41, installation handle 42, insert block 43;

[0031] Disassembly tool 5, disassembly cylinder 51, disassembly rod 52, disassembly handle 53, buckle 54, push rod 55, fixing sleeve 56, limit ring 57, spring 58, bottom ring 59, limit screw 510, external hexagonal structure 511, internal hexagonal structure 512;

[0032] Wall 6, mounting hole 61. Detailed Implementation

[0033] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0035] See the attached figures. The two-bladed pre-cut bottom anchor bolt of this embodiment includes a screw 1 and a sleeve 2. The screw 1 has 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 being fixed through a nut 31 and a washer 32. The expansion section 11 is shaped like an inverted frustum, and its diameter gradually increases from the threaded section 13 towards the bottom of the screw 1. A marking line 14 is provided on the smooth section 12 near the threaded section 13. When the marking line 14 is higher than the top of the sleeve 2, the expansion section 11 of the screw 1 passes over the locking key 21 of the sleeve 2.

[0036] The sleeve 2 has a locking key 21 at its bottom, which divides the lower end of the sleeve 2 into several equal expansion segments 22. Each expansion segment 22 has two grooves on its outer side: a friction groove 23 with an inclined friction surface, two protruding friction ribs 24, and an inwardly recessed deformation limiting groove 25. The friction ribs 24 strengthen the expansion segments and increase the friction after the locking key 21 deforms. Above the friction groove 23 is a circumferential deep groove, the deformation groove 26. During bottom-cutting installation, the deformation groove 26, in conjunction with the deformation limiting groove 25, makes anchor bolt deformation easier and more controllable. A nylon washer 27 is wrapped around the deformation groove 26, which increases the initial rigidity of the anchor bolt and provides some positioning for the locking key 21 and the sleeve, reducing initial installation wear.

[0037] To maintain excellent cutting performance even with a high-strength substrate, two alloy blades 28 are welded to the outside of the expansion flap 22. Together with a dedicated installation tool 4, these blades allow the locking key 21 to expand along the expansion section 11 of the screw 1. The alloy blades 28 are teeth evenly distributed on the outside of the sleeve. After installation, these teeth ensure stable contact and fixation between the lower end of the sleeve and the concrete hole wall, improving the stability of the connection.

[0038] On the upper outer side of sleeve 2, there is a circumferential knurled mark, known as knurling line 29. During installation, if the knurling line 29 does not penetrate the concrete after drilling and when placing the anchor bolt, the drilling is considered complete. Simultaneously, the middle section of sleeve 2 is equipped with a screw fixing point to secure the screw, and the top is equipped with a disassembly slot 210 and an installation groove 211.

[0039] Figure 7 As shown, the installation tool 4 is a matching tool for the above-mentioned two-bladed pre-cut bottom anchor bolt. The installation tool 4 includes a connecting sleeve 41 and an installation handle 42. The connecting sleeve 41 is provided with an insert 43, which can be inserted into the installation groove 211 at the tail of the sleeve 2. The head of the installation handle 42 is hollow and is fixedly connected to the connecting sleeve 41. The tail of the installation handle 42 is provided with a structure for use with an electric hammer. Under the action of the electric hammer, the sleeve 2 of the anchor bolt can be rotated, thereby causing the expansion flap 22 to cut the hole wall.

[0040] Figures 8-10As shown, the disassembly tool 5 is a matching tool for the aforementioned two-bladed pre-cut bottom anchor bolt. The disassembly tool includes a disassembly cylinder 51, a disassembly rod 52, and a disassembly handle 53. The front end of the disassembly cylinder 51 is provided with a buckle 54, which is L-shaped and engages with the disassembly slot 210 on the top of the sleeve 2. It is also fixed by a top rod 55. The outer side of the disassembly cylinder 51 is provided with a fixing sleeve 56. The bottom end of the top rod 55 is placed inside the fixing sleeve 56, and the top end abuts against the buckle 54. The fixing sleeve 56 is provided with a limiting ring 57, a spring 58, and a bottom ring 59. The bottom ring 59 is fixed inside the fixing sleeve 56 by a limiting screw 510. The spring 58 is placed above the bottom ring 59, and the limiting ring 57 is placed above the spring 58 and abuts against the bottom end of the top rod 55. The disassembly cylinder 51 is a hollow structure. The head of the disassembly rod 52 is inserted into the disassembly cylinder 51, and the two are threaded together. The tail of the disassembly rod 52 is provided with an external hexagonal structure 511, and the disassembly handle 53 is provided with an internal hexagonal structure 512, and the two are connected and engaged. The disassembly handle 53 is used in conjunction with the electric hammer for rotational motion, which can drive the disassembly cylinder 51 and the sleeve 2 to move outward through the disassembly rod 52.

[0041] During installation, drill the self-cutting bottom anchor bolt installation hole 61 in the wall 6 according to the specifications. Only one straight hole is needed; no additional enlargement is required. Place the anchor bolt into the installation hole, ensuring that the bottom of the screw 1 contacts the bottom of the hole. At this point, the expansion section 11 of the screw 1 has not exceeded the locking key 21 of the sleeve 2, and the expansion flap 22 of the locking key 21 is closed, allowing it to be easily inserted into the installation hole 61. Then, insert the connecting sleeve 41 of the installation tool 4 into the installation groove 211 at the tail of the sleeve 2, and use the electric hammer to move the sleeve 2 downward. Since the expansion section 11 at the bottom of the screw 1 is inverted conical, after the expansion flap 22 descends to contact the expansion section 11, it will gradually deform and expand outward, extending in all directions until it touches the hole wall. The expansion flap 22 will continue to rotate and hammer downward under the work of the electric hammer and the installation tool. The alloy blade 28 will cut and enlarge the hole wall. When the locking key is fully opened, the entire anchor bolt is stably connected by the locking key effect. When the mark line 14 at screw 1 is higher than the end of sleeve 2, the anchor bolt is considered to be installed in place.

[0042] After installation, the fixture is secured to the anchor bolt using nut 31 and washer 32, and torque is applied to nut 31. During the tightening of nut 31, sleeve 2 and screw 1 further displace relative to each other, causing the expansion flap 22 on sleeve 2 to continue to expand, and the alloy blade 28 to cut deeper into the concrete hole wall.

[0043] During disassembly, the top buckle 54 of the disassembly cylinder 51 is rotated and connected to the disassembly slot 210 at the tail of the sleeve 2, and fixed by the ejector pin 55; the external thread structure on the disassembly rod 52 is connected to the internal thread structure at the tail of the disassembly cylinder 51; the external hexagonal structure 511 at the tail of the disassembly rod 52 is connected to the internal hexagonal structure 512 of the disassembly handle 53; the disassembly handle 53 is used in conjunction with the electric hammer. When rotating, the disassembly cylinder 51 drives the sleeve 2 to move outward, thereby completing the disassembly work.

[0044] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A two-bladed, pre-cut bottom anchor bolt, comprising a screw and a sleeve, wherein the screw is sequentially provided with an expansion section, a smooth section, and a threaded section; the expansion section is shaped like an inverted frustum, and its diameter gradually increases from the threaded section towards the bottom end of the screw; characterized in that: The bottom of the sleeve is provided with a locking key, and the locking key is provided with multiple expansion petals. The outer side of the expansion petals is provided with friction grooves and deformation grooves, and the friction grooves are provided with friction ribs and deformation limiting grooves. The deformation grooves are provided with washers. The screw is inserted into the sleeve, and the expansion section of the screw passes through the expansion end, and the expansion petals are open. The top of the sleeve is provided with a disassembly slot and an installation groove.

2. The double-edged pre-cut bottom anchor bolt as described in claim 1, characterized in that: The expansion flaps are evenly distributed at the bottom of the sleeve, and two alloy blades are welded to the outside of the expansion flaps.

3. The double-edged pre-cut bottom anchor bolt as described in claim 1, characterized in that: The friction groove is provided with an inclined friction slope, and the friction slope is provided with two protruding friction ribs and an inwardly recessed deformation limiting groove.

4. The double-edged pre-cut bottom anchor bolt as described in claim 1, characterized in that: The deformation groove is equipped with a nylon washer, and the expansion flap squeezes the nylon washer during the deformation process.

5. A two-bladed pre-cut bottom anchor as described in claim 1, characterized in that: A marking line is provided on the screw. When the marking line is higher than the top of the sleeve, the expansion section of the screw passes over the locking key of the sleeve.

6. A two-bladed pre-cut bottom anchor as described in claim 1, characterized in that: The sleeve is provided with a knurled edge, which is the anchor bolt burial depth line.

7. The dismantling tool for the two-bladed pre-cut bottom anchor bolt according to any one of claims 1 to 6, characterized in that: It includes a disassembly cylinder, a disassembly rod, and a disassembly handle. The front end of the disassembly cylinder is provided with a buckle, which is connected to the top of the sleeve with a disassembly slot and is fixed by a top rod. The disassembly cylinder has a hollow structure, and the head of the disassembly rod is inserted into the disassembly cylinder, and the two are threaded together. The tail end of the disassembly rod is connected to the disassembly handle, and the disassembly handle can drive the disassembly cylinder and the sleeve to move outward through the disassembly rod.

8. The disassembly tool as described in claim 7, characterized in that: The outer side of the disassembly cylinder is provided with a fixing sleeve, the bottom end of the top rod is placed inside the fixing sleeve, and the top end abuts against the buckle; the fixing sleeve is provided with a limiting ring, a spring and a bottom ring, the bottom ring is fixed inside the fixing sleeve by a limiting screw, the spring is placed above the bottom ring, the limiting ring is placed above the spring and abuts against the bottom end of the top rod.

9. The disassembly tool as described in claim 7, characterized in that: The front end of the buckle is L-shaped and engages with the disassembly slot of the sleeve.

10. The disassembly tool as described in claim 7, characterized in that: The tail of the disassembly rod has an external hexagonal structure, and the disassembly handle has an internal hexagonal structure, which are connected and cooperate with each other.

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