Rear expanded-base self-tangent anchor bolt

Abstract

The utility model relates to the technical field of bolts, and discloses a rear-expanded-base self-tangent anchor bolt which comprises a rod body, a protruding rod is arranged at the lower end of the rod body, a screw rod is arranged at the upper end of the rod body, a gasket is arranged on the outer side of the screw rod, and a backing ring is arranged at the upper end of the gasket. According to the rear-expanded-base self-tangent anchor bolt, a round hole is formed in an installation wall, a rear expanding pipe is arranged on the outer side of a rod body in a sliding and sleeving mode, then a gasket and a backing ring are sequentially arranged on the outer side of the rod body in a sleeving mode, the rear-expanded-base self-tangent anchor bolt is knocked into the round hole of the wall through a knocking tool, a nut is screwed through the tool, and the expanding pipe makes contact with a protruding rod and expands outwards after being extruded; the first annular sharp blade and the second annular sharp blade cut into wall concrete to form a mechanical chain effect, the anchoring effect is achieved, the first annular groove and the second annular groove which are deep are formed, the contact surface area with the wall is increased, friction force is improved, the good anchoring effect is achieved, the first annular sharp blade and the second annular sharp blade cut into the concrete deeply, and the anchoring effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of bolts, in particular to a rear-expanded bottom self-cutting anchor bolt. Background Art

[0002] The post-expanded self-cutting anchor is an engineering technology used to fix and support deep foundation pits or underground structures. It is widely used in underground engineering, especially in construction, bridges, tunnels and subways. The principle of the post-expanded self-cutting anchor is to pre-drill a hole, then grout or pour specific materials into the hole, and then place the anchor into the hole. When the bottom of the anchor expands, an anchor body is formed.

[0003] China Utility Model Patent Publication No.: CN 214578172 U, discloses: an inverted self-cutting bottom anchor bolt, the inverted self-cutting bottom anchor bolt, the two sleeves adopt a segmented structure, corresponding to the first extrusion block and the second extrusion block respectively, after the first anchor bolt screw, the second anchor bolt screw and the sleeve are pre-installed in the drill hole, the nut is tightened, at this time, the first extrusion block and the second extrusion block will move outward so that the two expansion pieces will expand successively, the extrusion force on the side wall in the drill hole is greater, the bearing strength of the entire anchor bolt is stronger, and at the same time, the connection strength between the expansion piece and the hole is increased by the tooth pattern opened on the outside of the expansion piece. However, after the inverted self-cutting bottom anchor bolt is installed in the concrete wall, the depth of the tooth pattern cutting into the concrete is shallow, the anchoring effect is poor, and the anchoring force is weak. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a rear-expanded bottom self-cutting anchor bolt, which can effectively solve the problems in the prior art.

[0005] The technical solution adopted by the utility model is: a rear-expanded bottom self-cutting anchor bolt, comprising a rod body, a convex rod is arranged at the lower end of the rod body, a screw rod is arranged at the upper end of the rod body, a gasket is arranged on the outer side of the screw rod, a gasket ring is arranged on the upper end of the gasket, a nut is arranged on the upper end of the gasket ring, and a rear-expanded tube is arranged on the outer side of the rod body;

[0006] The rear expansion tube includes a tube body, an annular groove 1, an expansion tube, an annular groove 2, an annular sharp edge 1, annular sharp edge 2 and an expansion groove. An annular groove 1 is opened on the outer side of the tube body, an expansion tube is arranged at the lower end of the tube body, an annular groove 2 is opened on the outer side of the expansion tube, annular sharp edges 1 and 2 are arranged at the lower end of the expansion tube, and an expansion groove begins to be formed on the outer side of the expansion tube.

[0007] Preferably, the protruding rod has an outer shape of a truncated cone with rounded corners at the lower end, and the rod body, the protruding rod and the screw rod are made by an integral casting process.

[0008] Through the above technical solution, a truncated cone-shaped convex rod is provided, and the rear expansion tube expands along the convex rod under the extrusion of the nut, so as to be anchored to the wall.

[0009] Preferably, a thread is provided on the outer side of the screw rod, and the nut is threadably connected to the screw rod.

[0010] Through the above technical solution, a nut is provided, and the rear bottom-expanding self-cutting anchor bolt can be locked to the wall by tightening the nut.

[0011] Preferably, the inner diameter of the gasket is equal to the inner diameter of the tube body, and the tube body is threadedly connected to the rod shaft.

[0012] Through the above technical solution, a gasket is provided, and the gasket evenly applies the pressure transmitted by the nut to the rear expansion pipe, thereby improving the stability of the movement of the rear expansion pipe.

[0013] Preferably, the opening depths of the annular groove 1 and the annular groove 2 are 2.5 mm to 3 mm, and the outer diameter of the tube body is smaller than the major circle diameter of the convex rod.

[0014] Through the above technical scheme, when the rear-expanded self-cutting anchor bolt is installed, a circular hole is opened on the installation wall, the rear-expanded tube is slidably sleeved on the outside of the rod body, and then the gasket and the gasket ring are sequentially sleeved on the outside of the rod body, and a nut is used to thread the screw rod. The nut squeezes the gasket ring, the gasket and the rear-expanded tube toward the convex rod until the rear-expanded tube contacts the convex rod, and the rear-expanded self-cutting anchor bolt is knocked into the circular hole of the wall using a knocking tool, and the nut is tightened using the tool, the expansion tube contacts the convex rod, and expands outward after being squeezed, and the annular sharp blade 1 and the annular sharp blade 2 cut into the wall concrete to form a mechanical chain effect, thereby achieving an anchoring effect, and deeper annular grooves 1 and 2 are opened to increase the contact surface area with the wall, increase the friction force, and achieve a better anchoring effect.

[0015] Preferably, the annular sharp edge 1 and the annular sharp edge 2 have the same structure, and the difference between the major diameter and the minor diameter of the annular sharp edge is 3.2 mm to 4 mm.

[0016] Through the above technical solution, relatively protruding annular sharp blade 1 and annular sharp blade 2 are provided, which cut deeper into the concrete and have a good anchoring effect.

[0017] Preferably, four expansion grooves are provided, and the four expansion grooves are evenly opened on the outside of the expansion tube.

[0018] Through the above technical solution, an expansion groove is provided to facilitate expansion and locking.

[0019] Compared with the prior art, the utility model provides a rear-expanded bottom self-cutting anchor bolt, which has the following beneficial effects:

[0020] 1. The rear-expanded self-cutting anchor bolt, when installing the rear-expanded self-cutting anchor bolt, a circular hole is opened on the installation wall, the rear expansion tube is slidably sleeved on the outside of the rod body, and then the gasket and the gasket ring are sleeved on the outside of the rod body in turn, and a nut is used to thread the screw rod, and the nut squeezes the gasket ring, the gasket and the rear expansion tube toward the convex rod until the rear expansion tube contacts the convex rod, and the rear expansion bottom self-cutting anchor bolt is knocked into the circular hole of the wall with a knocking tool, and the nut is tightened with a tool, and the expansion tube contacts the convex rod and expands outward after being squeezed, and the annular sharp blade 1 and the annular sharp blade 2 cut into the wall concrete to form a mechanical chain effect to achieve an anchoring effect, and a deeper annular groove 1 and annular groove 2 are opened to increase the contact surface area with the wall, increase the friction force, and achieve a better anchoring effect, and the more prominent annular sharp blade 1 and annular sharp blade 2 cut deeper into the concrete, and the anchoring effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The three-dimensional structure of the utility model is shown in FIG. Figure 1 ;

[0022] Figure 2 The three-dimensional structure of the utility model is shown in FIG. Figure 2 ;

[0023] Figure 3 The three-dimensional structure of the utility model is shown in FIG. Figure 3 ;

[0024] Figure 4 The utility model shows the split structure of the shaft and rear expansion tube Figure 1 ;

[0025] Figure 5 The utility model shows the split structure of the shaft and rear expansion tube Figure 2 .

[0026] Among them: 1. rod body; 2. convex rod; 3. screw rod; 4. gasket; 5. gasket ring; 6. nut; 7. rear expansion tube; 701. tube body; 702. annular groove one; 703. expansion tube; 704. annular groove two; 705. annular sharp edge one; 706. annular sharp edge two; 707. expansion groove. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Embodiment 1: Figure 1-5As shown, the rear-expanded bottom self-cutting anchor bolt provided by the utility model comprises a rod body 1, a protruding rod 2 is arranged at the lower end of the rod body 1, a screw rod 3 is arranged at the upper end of the rod body 1, a gasket 4 is arranged on the outer side of the screw rod 3, a washer 5 is arranged on the upper end of the gasket 4, a nut 6 is arranged on the upper end of the washer 5, and a rear expansion tube 7 is arranged on the outer side of the rod body 1;

[0029] The rear expansion tube 7 includes a tube body 701, an annular groove 1 702, an expansion tube 703, an annular groove 2 704, an annular sharp edge 1 705, an annular sharp edge 2 706 and an expansion groove 707. An annular groove 1 702 is provided on the outer side of the tube body 701, an expansion tube 703 is provided at the lower end of the tube body 701, an annular groove 2 704 is provided on the outer side of the expansion tube 703, an annular sharp edge 1 705 and an annular sharp edge 2 706 are provided at the lower end of the expansion tube 703, and an expansion groove 707 begins to be provided on the outer side of the expansion tube 703.

[0030] Specifically, the convex rod 2 is in the shape of a truncated cone with rounded corners at the lower end, and the rod body 1, the convex rod 2 and the screw rod 3 are made by an integral casting process. The advantage is that the convex rod 2 with a truncated cone structure is provided, and the rear expansion tube 7 expands along the convex rod 2 under the extrusion of the nut 6, so as to be anchored to the wall.

[0031] Specifically, the outer side of the screw rod 3 is provided with a thread, and the nut 6 is threadedly connected with the screw rod 3. The advantage is that the nut 6 is provided, and the rear bottom expansion self-cutting anchor bolt can be locked with the wall by tightening the nut 6.

[0032] Specifically, the inner diameter of the gasket 4 is equal to the inner diameter of the tube body 701, and the tube body 701 is threadedly connected to the shaft 1. The advantage is that the gasket 4 is provided, and the gasket 4 evenly applies the pressure transmitted by the nut 6 to the rear expansion tube 7, thereby improving the stability of the movement of the rear expansion tube 7.

[0033] Embodiment 2: Figure 2-5 As shown, as an improvement to the previous embodiment.

[0034] Specifically, the depth of the first annular groove 702 and the second annular groove 704 is 2.5 mm to 3 mm, and the outer diameter of the tube body 701 is smaller than the large circle diameter of the protruding rod 2 . The advantage is that when the rear-expanded self-cutting anchor bolt is installed, a circular hole is opened on the installation wall, the rear-expanded tube 7 is slidably sleeved on the outside of the rod body 1, and then the gasket 4 and the gasket ring 5 are sequentially sleeved on the outside of the rod body 1, and the nut 6 is used to threadably connect with the screw rod 3. The nut 6 squeezes the gasket ring 5, the gasket 4 and the rear-expanded tube 7 toward the protruding rod 2 until the rear-expanded tube 7 contacts the protruding rod 2, and the rear-expanded self-cutting anchor bolt is knocked into the circular hole in the wall using a knocking tool, and the nut 6 is tightened using the tool, and the expansion tube 703 contacts the protruding rod 2 and expands outward after being squeezed, and the annular sharp blade 1 705 and the annular sharp blade 2 705 cut into the wall concrete to form a mechanical chain effect, thereby achieving an anchoring effect, and a deeper annular groove 1 702 and annular groove 2 704 are opened to increase the contact surface area with the wall, increase the friction force, and achieve a better anchoring effect.

[0035] Specifically, the structures of the annular sharp blade 1 705 and the annular sharp blade 2 706 are the same, and the difference between the major diameter and the minor diameter of the annular sharp blade 1 705 is 3.2 mm to 4 mm. The advantage is that the relatively prominent annular sharp blade 1 705 and the annular sharp blade 2 706 are provided, which can cut deeper into the concrete and have a good anchoring effect.

[0036] Specifically, four expansion grooves 707 are provided, and the four expansion grooves 707 are evenly opened on the outside of the expansion tube 703. The advantage is that the expansion grooves 707 are provided to facilitate expansion and locking.

[0037] Working principle: During installation, a circular hole is opened on the installation wall, the rear expansion tube 7 is slidably sleeved on the outside of the rod body 1, and then the gasket 4 and the gasket ring 5 are sequentially sleeved on the outside of the rod body 1, and the nut 6 is used to thread the screw rod 3. The nut 6 squeezes the gasket ring 5, the gasket 4 and the rear expansion tube 7 toward the protruding rod 2 until the rear expansion tube 7 contacts the protruding rod 2, and the rear expansion bottom self-cutting anchor bolt is knocked into the circular hole in the wall with a knocking tool. The nut 6 is tightened with a tool, and the expansion tube 703 contacts the protruding rod 2 and expands outward after being squeezed. The annular sharp blade 1 705 and the annular sharp blade 2 705 cut into the wall concrete to form a mechanical chain effect to achieve the effect of anchoring, and deeper annular groove 1 702 and annular groove 2 704 are opened to increase the contact surface area with the wall, increase the friction force, and achieve a better anchoring effect.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rear-expanded, self-cutting anchor bolt, comprising a shaft (1), characterized in that: The lower end of the rod body (1) is provided with a protruding rod (2), the upper end of the rod body (1) is provided with a screw rod (3), the outer side of the screw rod (3) is provided with a washer (4), the upper end of the washer (4) is provided with a washer ring (5), the upper end of the washer ring (5) is provided with a nut (6), and the outer side of the rod body (1) is provided with a rear expansion tube (7); The rear expansion tube (7) comprises a tube body (701), an annular groove 1 (702), an expansion tube (703), an annular groove 2 (704), an annular sharp edge 1 (705), an annular sharp edge 2 (706) and an expansion groove (707); an annular groove 1 (702) is provided on the outer side of the tube body (701); an expansion tube (703) is provided at the lower end of the tube body (701); an annular groove 2 (704) is provided on the outer side of the expansion tube (703); an annular sharp edge 1 (705) and an annular sharp edge 2 (706) are provided at the lower end of the expansion tube (703); and an expansion groove (707) begins to be provided on the outer side of the expansion tube (703).

2. The rear-expanded self-cutting anchor bolt according to claim 1, characterized in that: The convex rod (2) has an outer shape of a truncated cone structure with rounded corners at the lower end, and the rod body (1), the convex rod (2) and the screw rod (3) are manufactured by an integral molding casting process.

3. The rear-expanded self-cutting anchor bolt according to claim 1, characterized in that: The outer side of the screw rod (3) is provided with threads, and the nut (6) is threadedly connected to the screw rod (3).

4. The rear-expanded self-cutting anchor bolt according to claim 1, characterized in that: The inner diameter of the gasket (4) is equal to the inner diameter of the tube body (701), and the tube body (701) is threadedly connected to the shaft (1).

5. The rear-expanded self-cutting anchor bolt according to claim 1, characterized in that: The opening depths of the annular groove 1 (702) and the annular groove 2 (704) are 2.5 mm to 3 mm, and the outer diameter of the tube body (701) is smaller than the large circle diameter of the convex rod (2).

6. The rear-expanded self-cutting anchor bolt according to claim 1, characterized in that: The structures of the annular sharp blade 1 (705) and the annular sharp blade 2 (706) are the same, and the difference between the major diameter and the minor diameter of the annular sharp blade 1 (705) is 3.2 mm to 4 mm.

7. The rear-expanded self-cutting anchor bolt according to claim 1, characterized in that: There are four expansion grooves (707), and the four expansion grooves (707) are evenly opened on the outside of the expansion tube (703).

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