Expansion anchor bolt

Abstract

The invention discloses an expansion anchor bolt, which is a fastening connection element commonly used in the building field, and comprises a screw rod and an expansion piece which are matched for use, and a rubber gasket and a flat gasket which are sleeved on the screw rod and are used between the screw rod and the expansion piece, the outer diameter of the rubber gasket is smaller than that of the flat gasket, and when the screw rod is correctly screwed to the preset torque, the rubber gasket is extruded and deformed till the outer diameter is equal to that of the flat gasket. The rubber gasket and the flat gasket are additionally arranged between the screw rod and the expansion piece, so that the degree of screwing the screw rod into the expansion piece is judged, scientific guidance can be provided for workers in actual use, the screw rod is ensured to be correctly screwed to a preset torque, the expansion piece can effectively expand and is firmly fixed on a base material, a good anchoring structure is formed, and the service life of the expansion piece is prolonged. Failure installation caused by too large or too small torque is avoided.

Description

Technical Field

[0001] The invention relates to a fastening connection element commonly used in the field of construction, in particular to an expansion anchor bolt. Background Art

[0002] In the construction field, concrete anchor bolts are often used to fix structures such as sidings and keels to the walls or roofs of houses.

[0003] The Chinese utility model patent with publication number CN219452667U discloses a concrete anchor bolt, including a head and a screw rod, on which a first thread (large tooth), a second thread (small tooth) and a third thread (small tooth) arranged in a three-line spiral are processed. When in use, a preset hole with a hole diameter smaller than the outer diameter of the "small tooth" is opened in the concrete. When the concrete anchor bolt is screwed into the preset hole, the inner wall of the preset hole is cut by the first thread, the second thread and the third thread to achieve an anchoring effect. The concrete anchor bolt can be used for anchoring connections of medium and low grade concrete (concrete with a hardness less than C35), but sometimes it still shows a poor anchoring effect in actual use. The specific reasons are: First, affected by factors such as material composition and construction technology, the hardness of the concrete substrate actually formed during construction is usually uneven. This hardness difference will directly affect the anchoring effect of the concrete anchor bolt after installation; Second, when screwing the concrete anchor bolt into the preset hole, workers can only judge whether the anchor bolt is tightened in place based on experience. There is no scientific basis and it is impossible to accurately control the applied torque: too much torque will cause the concrete base material to crack, and the anchor bolt cannot be properly locked, affecting the anchoring effect; too little torque will result in the failure to achieve the predetermined tightening force of the anchor bolt, making the connection loose and affecting the anchoring effect. Summary of the invention

[0004] The invention provides an expansion anchor bolt, aiming to solve the problem that the anchoring effect of traditional concrete anchor bolts is poor due to the hardness difference of concrete base material and the degree of construction standardization of workers.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: an expansion anchor bolt, including a matching screw rod and an expansion piece, and also including a rubber gasket and a flat gasket sleeved on the screw rod and used between the screw rod and the expansion piece; the outer diameter of the rubber gasket is smaller than the outer diameter of the flat gasket, and when the screw rod is correctly tightened to a predetermined torque, the rubber gasket is squeezed and deformed to an outer diameter equal to the outer diameter of the flat gasket.

[0006] As a limitation of the present invention, the screw rod comprises a rod body and a head which are integrally arranged, wherein the outer surface of the rod body is processed with threads, and an end of the head away from the rod body is processed with a female hole.

[0007] As a further limitation of the present invention, the female hole is a threaded hole.

[0008] As another limitation of the present invention, the expansion member is any one of the following: a. The expansion member includes an expansion sleeve designed with an expansion section and a conical nut used to cooperate with the screw thread to expand the expansion section outward; b. The expansion piece is a petal expansion nut; c. The expansion piece is a serrated expansion tube.

[0009] As a further limitation of the present invention, the outer diameter of the flat gasket is 1.25 to 1.5 times the outer diameter of the rubber gasket, and the thickness of the flat gasket is 0.75 to 0.8 times the thickness of the rubber gasket.

[0010] As a further limitation of the present invention, the flat gasket has an outer diameter of 20 mm and a thickness of 1.5 mm; the rubber gasket has an outer diameter of 16 mm and a thickness of 2.0 mm.

[0011] As a further limitation of the present invention, the outer diameter of the flat gasket is 24 mm and the thickness is 2.0 mm; the outer diameter of the rubber gasket is 16 mm and the thickness is 2.5 mm.

[0012] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art: (1) The present invention realizes the judgment of the degree of screw insertion into the expansion member by adding a rubber gasket and a flat gasket between the screw and the expansion member. In actual use, it can provide scientific guidance for workers to ensure that the screw is correctly tightened to the predetermined torque and avoid installation failure caused by excessive or insufficient torque. Specifically, the rubber gasket is used to convert the degree of screw insertion into the expansion member into the deformation of its own outer diameter, so as to realize the visualization of the screw insertion degree (i.e., the applied torque); the outer diameter of the flat gasket is used as a reference standard. When the rubber gasket is deformed to an outer diameter equal to the outer diameter of the flat gasket, it indicates that the screw is correctly tightened to the predetermined torque. Therefore, the present invention can provide scientific guidance for workers' construction specifications, so that it can be correctly installed on the substrate and form a good anchoring effect.

[0013] (2) The present invention uses matching screws and expansion pieces. Compared with traditional threaded rotary cut concrete anchor bolts, the present invention uses expansion pieces to weaken the influence of the hardness difference of the concrete substrate on the final anchoring effect, and can be better applied to concrete substrates with uneven hardness. In addition, the present invention has a mother hole processed on the screw head. After the present invention is installed on the concrete substrate, the structural parts can be connected through the mother hole, thereby achieving the fixation of the structural parts on the concrete substrate, with fast installation speed, high construction efficiency and convenience for later disassembly of the structural parts.

[0014] (3) Selecting expansion pieces of different structures can make the present invention have different uses: when the expansion piece is an expansion sleeve and a conical nut, the present invention is used for the installation of structural parts on a concrete substrate; when the expansion piece is a petal expansion nut, the present invention is used for the installation of structural parts on a metal substrate (such as steel); when the expansion piece is a sawtooth expansion tube, the present invention is used for the installation of structural parts on wood. Regardless of the use, the rubber gasket and flat gasket added by the present invention can provide scientific guidance for workers during actual use to ensure that the screw is correctly tightened to the predetermined torque, so that the expansion piece can effectively expand and be firmly fixed on the substrate to form a good anchoring structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the split structure of Example 1 of the present invention; Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 4 This is a schematic diagram of the split structure of Example 2 of the present invention; Figure 5 This is a schematic diagram of the split structure of Example 3 of the present invention; In the figure: 1. Screw; 2. Expansion piece; 3. Rubber gasket; 4. Flat gasket; 5. Expansion sleeve; 6. Conical nut; 7. Petal expansion nut; 8. Sawtooth expansion tube; 101, rod body; 102, head; 103, female hole; 201, casing section; 202, expansion section; 203, conical section; 204, cylindrical section; 301, nut portion; 302, expansion portion; 303, fold; 401, threaded portion; 402, serrated tapered portion; 403, slit. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention, and are not used to limit the present invention.

[0018] Example 1 An expansion anchor like Figure 1 and Figure 2 As shown, this embodiment includes a screw rod 1 and an expansion member 2 that are used together, and a rubber gasket 3 and a flat gasket 4 that can be sleeved on the screw rod 1 and used between the screw rod 1 and the expansion member 2 .

[0019] The screw rod 1 includes a rod body 101 and a head 102 which are integrally arranged. Figure 2 As shown, the outer surface of the rod body 101 is processed with threads, and the head 102 is an external hexagonal convex head, that is, the cross-section of the head 102 is a regular hexagon. Of course, the head 102 can also be set as a regular pentagonal convex head or a quadrilateral convex head according to actual conditions. A female hole 103 is processed on the end face of the head 102 away from the rod body 101. The female hole 103 is an internal thread hole. Through the female hole 103, a structural part with an external thread matching the female hole 103 can be detachably set on this embodiment.

[0020] The expansion member 2 comprises an expansion sleeve 5 and a conical nut 6. Figure 2 As shown, the expansion sleeve 5 includes an integrally arranged sleeve section 201 and an expansion section 202. The conical nut 6 includes an integrally arranged conical portion 203 and a cylindrical portion 204, wherein the minimum outer diameter of the conical portion 203 is equal to the inner diameter of the expansion sleeve 5; the maximum outer diameter of the conical portion 203 is equal to the outer diameter of the cylindrical portion 204 and is greater than the inner diameter of the expansion sleeve 5. The conical nut 6 has an internal threaded hole that matches the thread of the screw 1. When the screw 1 is screwed into the conical nut 6, the conical nut 6 gradually approaches the head 102 of the screw 1 to expand the expansion section 202 of the expansion sleeve 5 outward.

[0021] like Figure 2 As shown, the rubber gasket 3 and the flat gasket 4 are both annular structures. The inner diameter of the rubber gasket 3 is equal to the inner diameter of the flat gasket 4, and is adapted to the outer diameter of the rod body 101 of the screw 1. The outer diameter of the flat gasket 4 is larger than the outer diameter of the rubber gasket 3. Specifically, the outer diameter of the flat gasket 4 is 1.25 to 1.5 times the outer diameter of the rubber gasket 3, and the thickness of the flat gasket 4 is 0.75 to 0.8 times the thickness of the rubber gasket 3. When the screw 1 is correctly tightened to a predetermined torque, the rubber gasket 3 is squeezed and deformed to an outer diameter equal to the outer diameter of the flat gasket 4.

[0022] This embodiment provides two specific sizes of the flat gasket 4 and the rubber gasket 3: ① the outer diameter of the flat gasket 4 is 20 mm and the thickness is 1.5 mm, and the outer diameter of the rubber gasket 3 is 16 mm and the thickness is 2.0 mm; ② the outer diameter of the flat gasket 4 is 24 mm and the thickness is 2.0 mm, and the outer diameter of the rubber gasket 3 is 16 mm and the thickness is 2.5 mm.

[0023] This embodiment is mainly used on a concrete substrate. When using this embodiment, a preset hole is first opened on the concrete substrate, and the screw 1, rubber gasket 3, flat gasket 4, expansion sleeve 5 and conical nut 6, which are preliminarily assembled as one, are placed in the preset hole. Then the screw 1 is tightened to make the conical nut 6 approach the head 102 of the screw 1, and then the conical nut 6 is used to expand the expansion section 202 of the expansion sleeve 5 outward and anchor it in the preset hole. When the screw 1 is tightened, the head 102 of the screw 1 will squeeze the rubber gasket 3 and the flat gasket 4, so that they are in close contact with the surface of the concrete substrate. When the rubber gasket 3 is squeezed and deformed to an outer diameter equal to the outer diameter of the flat gasket 4, it is determined that the screw 1 is correctly tightened to the predetermined torque, and a good anchoring effect can be formed at this time. Finally, the target structural part is connected through the female hole 103 of the head 102 of the screw 1, so that the target structural part can be installed on the concrete substrate.

[0024] Example 2 An expansion anchor The structure of this embodiment is basically the same as that of embodiment 1, except that in this embodiment, the flat gasket 4 is fixed on the expansion member 2, and the expansion member 2 in this embodiment is a petal expansion nut 7. Figure 3 and Figure 4 As shown, the petal expansion nut 7 includes an integrally arranged nut portion 301 and an expansion portion 302, the nut portion 301 having an internal thread matching the screw rod 1, the expansion portion 302 being a plurality of connecting rods distributed along the circumferential direction, the bottom end of the connecting rod being fixedly connected to the nut portion 301, and the top end of the connecting rod being fixedly connected to the flat gasket 4. A fold 303 is provided in the middle of each connecting rod of this embodiment.

[0025] This embodiment is mainly used on metal profiles. When using this embodiment, a preset hole needs to be provided on the metal profile. First, insert the screw 1, rubber gasket 3, and petal expansion nut 7 that are initially assembled into one into the preset hole, and then tighten the screw 1 so that the nut portion 301 of the petal expansion nut 7 approaches the head 102 of the screw 1, and then squeezes the expansion portion 302 to expand outward (with the crease 303 as the center, and the two ends of the connecting rod are folded in half), forming a structure larger than the preset hole diameter, and anchoring it at the preset hole position. As in Example 1, when tightening the screw 1, the head 102 of the screw 1 will squeeze the rubber gasket 3, so that it is in close contact with the flat gasket 4 attached to the surface of the metal profile. When the rubber gasket 3 is squeezed and deformed to an outer diameter equal to the outer diameter of the flat gasket 4, it is determined that the screw 1 is correctly tightened to the predetermined torque, and a good anchoring effect can be formed at this time.

[0026] Finally, the target structural part is connected through the female hole 103 of the head 102 of the screw rod 1, so that the target structural part can be installed on the metal profile.

[0027] Example 3 An expansion anchor The structure of this embodiment is basically the same as that of the first embodiment, except that the expansion member 2 in this embodiment is a sawtooth expansion tube 8 .

[0028] like Figure 5 As shown, the sawtooth expansion tube 8 includes an integrally arranged threaded portion 401 and a sawtooth tapered portion 402. The threaded portion 401 is a cylindrical sleeve, the inner diameter of which matches the diameter of the rod body 101 of the screw 1, and the inner wall is provided with an internal thread that matches the screw 1. The sawtooth tapered portion 402 is a tapered sleeve, the inner diameter of which gradually decreases from the top to the bottom, and the inner diameter at each position is smaller than the diameter of the rod body 101 of the screw 1. The outer surface of the sawtooth tapered portion 402 is a concave-convex surface, and the sawtooth tapered portion 402 is divided into a multi-petal structure by a slit 403 arranged along the axial direction.

[0029] This embodiment is mainly used on wood. When using this embodiment, a preset hole needs to be provided on the wood. First, the serrated expansion tube 8 is placed in the preset hole, and then the screw 1 with the rubber gasket 3 and the flat gasket 4 is screwed into the serrated expansion tube 8. As the screw 1 is screwed in, the serrated conical portion 402 of the serrated expansion tube 8 is expanded outward to be anchored in the preset hole. As in Example 1, when tightening the screw 1, the head 102 of the screw 1 will squeeze the rubber gasket 3 and the flat gasket 4 so that they are in close contact with the surface of the wood. When the rubber gasket 3 is squeezed and deformed to an outer diameter equal to the outer diameter of the flat gasket 4, it is determined that the screw 1 is correctly tightened to the predetermined torque, and a good anchoring effect can be formed at this time. Finally, the target structural member is connected through the female hole 103 of the head 102 of the screw 1, so that the target structural member can be installed on the wood.

[0030] It should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An expansion anchor bolt, comprising a screw rod and an expansion member for use together, characterized in that: It also includes a rubber gasket and a flat gasket which are sleeved on the screw and used between the screw and the expansion piece; the outer diameter of the rubber gasket is smaller than the outer diameter of the flat gasket. When the screw is correctly tightened to a predetermined torque, the rubber gasket is squeezed and deformed to an outer diameter equal to the outer diameter of the flat gasket.

2. The expansion anchor according to claim 1, characterized in that: The screw rod comprises a rod body and a head which are integrally arranged, wherein the outer surface of the rod body is processed with threads, and an end of the head which is away from the rod body is processed with a female hole.

3. The expansion anchor according to claim 2, characterized in that: The female hole is a threaded hole.

4. The expansion anchor according to any one of claims 1 to 3, characterized in that: The expansion piece is any of the following: a. The expansion member includes an expansion sleeve designed with an expansion section and a conical nut used to cooperate with the screw thread to expand the expansion section outward; b. The expansion piece is a petal expansion nut; c. The expansion piece is a sawtooth expansion tube.

5. The expansion anchor according to claim 4, characterized in that: The outer diameter of the flat gasket is 1.25 to 1.5 times the outer diameter of the rubber gasket, and the thickness of the flat gasket is 0.75 to 0.8 times the thickness of the rubber gasket.

6. The expansion anchor according to claim 5, characterized in that: The outer diameter of the flat gasket is 20mm and the thickness is 1.5mm; the outer diameter of the rubber gasket is 16mm and the thickness is 2.0mm.

7. The expansion anchor according to claim 5, characterized in that: The outer diameter of the flat gasket is 24mm and the thickness is 2.0mm; the outer diameter of the rubber gasket is 16mm and the thickness is 2.5mm.

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