Expansion anchor bolt

Abstract

The utility model discloses an expansion anchor bolt, which is a fastening connecting 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 preset torque, the expansion piece can be effectively expanded and firmly fixed on a base material, and the service life of the expansion piece is prolonged. A good anchoring structure is formed, and invalid installation caused by too large or too small torque is avoided.

Description

Technical Field

[0001] The utility model 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 wall panels and keels to the walls or roofs of houses.

[0003] Chinese utility model patent publication number CN219452667U discloses a concrete anchor bolt comprising a head and a screw, which is machined with a first thread (large thread), a second thread (small thread), and a third thread (small thread) arranged in a three-thread helical pattern. During use, a pre-set hole with a diameter smaller than the outer diameter of the "small thread" is drilled into the concrete. As the concrete anchor bolt is screwed into the pre-set hole, the first, second, and third threads cut into the inner wall of the pre-set hole, achieving an anchoring effect. While this concrete anchor bolt is suitable for anchoring low- to medium-grade concrete (concrete with a hardness less than C35), it can sometimes exhibit poor anchoring performance in actual use. The specific reasons are:

[0004] First, due to factors such as material composition and construction technology, the hardness of the concrete substrate formed during construction is usually uneven. This hardness difference will directly affect the anchoring effect of the concrete anchor bolts after installation.

[0005] Secondly, when screwing concrete anchor bolts into preset holes, workers can only judge whether the anchor bolts are 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 anchor bolt's predetermined tightening force not being achieved, making the connection loose and affecting the anchoring effect. Utility Model Content

[0006] The utility model provides an expansion anchor bolt, which aims to solve the problem of poor anchoring effect of traditional concrete anchor bolts caused by differences in hardness of concrete base materials and construction standards of workers.

[0007] 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 and expansion piece, and also including a rubber gasket and a flat gasket that 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.

[0008] As defined in the present invention, the screw comprises an integrally arranged rod body and a head, 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.

[0009] As a further limitation of the present invention, the female hole is a threaded hole.

[0010] As another limitation of the present invention, the expansion member is any one of the following:

[0011] a. The expansion member includes an expansion sleeve designed with an expansion section and a tapered nut for cooperating with the screw thread to expand the expansion section outward;

[0012] b. The expansion piece is a petal expansion nut;

[0013] c. The expansion piece is a serrated expansion tube.

[0014] 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.

[0015] As a further limitation of the present invention, the outer diameter of the flat gasket is 20 mm and the thickness is 1.5 mm; the outer diameter of the rubber gasket is 16 mm and the thickness is 2.0 mm.

[0016] 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.

[0017] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0018] (1) The present invention realizes the judgment of the degree to which the screw is screwed 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, avoiding installation failure caused by excessive or insufficient torque. Specifically, the rubber gasket is used to convert the degree to which the screw is screwed into the expansion member into the deformation of its own outer diameter, thereby realizing the visualization of the screw screwing 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.

[0019] (2) The present invention uses a matching screw and expansion piece. Compared with the traditional threaded rotary cut concrete anchor bolt, the present invention uses the expansion piece to weaken the influence of the hardness difference of the concrete substrate on the final anchoring effect, which is more suitable for 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. The installation speed is fast, the construction efficiency is high, and the structural parts are easy to disassemble later.

[0020] (3) Selecting expansion pieces of different structures can enable the present invention to have different uses: when the expansion piece is an expansion sleeve and a tapered nut, the present invention is used for installing structural parts on a concrete substrate; when the expansion piece is a petal expansion nut, the present invention is used for installing structural parts on a metal substrate (such as steel); when the expansion piece is a serrated expansion tube, the present invention is used for installing structural parts on wood. Regardless of the use, the rubber gasket and flat gasket added to the present invention can provide scientific guidance to 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 to the substrate, forming a good anchoring structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;

[0023] Figure 2 This is a schematic diagram of the split structure of Example 1 of the present utility model;

[0024] Figure 3 This is a schematic structural diagram of Example 2 of the present utility model;

[0025] Figure 4 This is a schematic diagram of the split structure of Example 2 of the present utility model;

[0026] Figure 5 This is a schematic diagram of the split structure of Example 3 of the present utility model;

[0027] 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;

[0028] 101, rod body; 102, head; 103, female hole;

[0029] 201, casing section; 202, expansion section; 203, tapered section; 204, cylindrical section;

[0030] 301, nut portion; 302, expansion portion; 303, fold;

[0031] 401, threaded portion; 402, serrated tapered portion; 403, slit. DETAILED DESCRIPTION

[0032] 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 intended to limit the present invention.

[0033] Example 1 An expansion anchor

[0034] like Figure 1 and Figure 2 As shown, this embodiment includes a screw rod 1 and an expansion member 2 for use together, as well as 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.

[0035] The screw 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 threaded, and the head 102 is an external hexagonal ridge head, that is, the cross-section of the head 102 is a regular hexagon. Of course, the head 102 can also be configured as a regular pentagonal ridge head or a quadrilateral ridge head, depending on the actual situation. A female hole 103 is machined on the end surface of the head 102 away from the rod body 101. Female hole 103 is an internally threaded hole. Through female hole 103, a structural member with external threads that match female hole 103 can be detachably installed in this embodiment.

[0036] The expansion member 2 includes an expansion sleeve 5 and a conical nut 6. Figure 2 As shown, the expansion sleeve 5 comprises an integral sleeve section 201 and an expansion section 202. The conical nut 6 comprises an integral conical portion 203 and a cylindrical portion 204. 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 greater than the inner diameter of the expansion sleeve 5. The conical nut 6 has an internally threaded hole that mates with the threaded rod 1. When the screw 1 is screwed into the conical nut 6, the conical nut 6 gradually approaches the screw head 102, causing the expansion section 202 of the expansion sleeve 5 to expand outward.

[0037] like Figure 2As shown, both the rubber gasket 3 and the flat gasket 4 are circular ring structures. The inner diameter of the rubber gasket 3 is equal to that of the flat gasket 4 and matches the outer diameter of the rod body 101 of the screw 1. The outer diameter of the flat gasket 4 is larger than that 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 properly tightened to the predetermined torque, the rubber gasket 3 is squeezed and deformed until its outer diameter equals the outer diameter of the flat gasket 4.

[0038] 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.

[0039] This embodiment is primarily used on concrete substrates. To use this embodiment, a pre-set hole is first created in the concrete substrate. The pre-assembled screw 1, rubber gasket 3, flat gasket 4, expansion sleeve 5, and tapered nut 6 are then inserted into the pre-set hole. The screw 1 is then tightened, causing the tapered nut 6 to approach the head 102 of the screw 1. The tapered nut 6 then expands the expansion section 202 of the expansion sleeve 5 outward, anchoring it in the pre-set hole. As the screw 1 is tightened, the head 102 of the screw 1 compresses the rubber gasket 3 and flat gasket 4, forcing them into close contact with the concrete substrate surface. When the rubber gasket 3 is deformed to an outer diameter equal to that of the flat gasket 4, the screw 1 is determined to have been correctly tightened to the predetermined torque, achieving a good anchoring effect. Finally, the target structural component is connected via the female hole 103 of the head 102 of the screw 1, thereby achieving installation of the target structural component on the concrete substrate.

[0040] Example 2: An expansion anchor

[0041] The structure of this embodiment is basically the same as that of embodiment 1, except that the flat washer 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 integral nut portion 301 and an expansion portion 302. The nut portion 301 has an internal thread that matches the screw 1. The expansion portion 302 is a plurality of connecting rods distributed along the circumference. The bottom ends of the connecting rods are fixedly connected to the nut portion 301, and the top ends of the connecting rods are fixedly connected to the flat washer 4. In this embodiment, a fold 303 is provided in the middle of each connecting rod.

[0042] This embodiment is mainly used on metal profiles. When using this embodiment, a preset hole needs to be provided on the metal profile. First, the screw 1, rubber gasket 3, and petal expansion nut 7 that are preliminarily assembled together are inserted into the preset hole, and then the screw 1 is tightened so that the nut portion 301 of the petal expansion nut 7 approaches the head 102 of the screw 1, and then the expansion portion 302 is squeezed to expand outward (with the fold 303 as the center, the two ends of the connecting rod are folded in half), forming a structure larger than the preset hole diameter, and anchored 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.

[0043] Finally, the target structural part is connected to the female hole 103 of the head 102 of the screw 1, so that the target structural part can be installed on the metal profile.

[0044] Example 3: An expansion anchor

[0045] The structure of this embodiment is basically the same as that of embodiment 1, except that the expansion member 2 in this embodiment is a zigzag expansion tube 8 .

[0046] like Figure 5 As shown, the serrated expansion tube 8 comprises an integrally formed threaded portion 401 and a serrated tapered portion 402. The threaded portion 401 is a cylindrical sleeve with an inner diameter that matches the diameter of the body 101 of the screw 1 and features internal threads on its inner wall that match the diameter of the screw 1. The serrated tapered portion 402 is a tapered sleeve with an inner diameter that gradually decreases from top to bottom and is smaller than the diameter of the body 101 of the screw 1 at all locations. The outer surface of the serrated tapered portion 402 is concave and convex, and the serrated tapered portion 402 is divided into multiple lobes by axially arranged slits 403.

[0047] 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 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 wood.

[0048] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may still modify the technical solutions described in the above embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An expansion anchor, comprising a screw and an expansion member, characterized in that: It also includes a rubber gasket and a flat gasket that 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 comprises an integrally arranged rod body and a head, 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.

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 tapered nut for cooperating 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.

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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