Novel expansion anchor rod

Abstract

The utility model provides a novel expansion anchor rod. The novel expansion anchor rod comprises a sleeve and a grouting pipe arranged in the sleeve in a sleeved mode. The grouting pipe is provided with a reducing expansion end part at the end part of the anchoring side of the novel expansion anchor rod, and the other end of the grouting pipe is provided with an external thread; a rotating handle is arranged at the end, provided with the external threads, of the grouting pipe, and internal threads are arranged on the inner side of the rotating handle so as to be matched with the external threads on the grouting pipe. The sleeve is provided with a plurality of sharp ends at the end of the anchoring side of the novel expansion anchor rod, and in the initial state, the free ends of the sharp ends at least do not exceed the variable-diameter expansion end of the grouting pipe. The structure of the anchoring end of the anchor rod is improved, the anchoring effect is improved, the required anchoring force can be achieved without enlarging the hole diameter or the depth of a drilled hole, the construction difficulty is reduced, the manufacturing cost is reduced, meanwhile, operation is easy and convenient, popularization is easy, the shape and length of a sleeve notch (tip) can be flexibly changed according to the geological condition of surrounding rock, and different construction requirements are met.

Description

Technical Field

[0001] The utility model relates to the field of engineering construction, in particular to a novel expanded anchor rod. Background Art

[0002] Anchor rods are one of the most basic components of tunnel and foundation pit support and are widely used in engineering construction to reinforce slopes, tunnels and dam bodies. As an active support, anchor rod support not only allows appropriate deformation of the surrounding rock but also improves the bearing capacity of the rock mass, giving full play to the stability of the surrounding rock.

[0003] The whole anchor rod is divided into a free section and an anchoring section. The anchoring force plays a decisive role in the bearing capacity of the anchor rod, and its size depends on the combination state of the anchoring section and the surrounding rock and soil, including the size and shape of the surface area of ​​the anchoring section, the properties of the rock and soil, and the bonding force and friction resistance between the two. For specific surrounding rocks, the designed anchoring force is generally obtained by adjusting the size of the surface area of ​​the anchoring section, the length of the anchoring section, or the shape of the anchoring section. In actual construction, it is often necessary to design a longer anchoring section or a larger aperture to obtain the required anchoring force. However, it is difficult to expand the aperture or increase the drilling depth in soft and broken formations, and the hole is prone to collapse. The grouting time and grouting amount are difficult to control. This will not only increase the cost but also increase the difficulty of construction, limiting the application of anchor rods. Utility Model Content

[0004] The main purpose of the utility model is to provide a new type of expanded anchor rod, hoping to effectively solve the problems in the background technology.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A new type of expanded body anchor rod, characterized in that: it includes a sleeve and a grouting pipe sleeved in the sleeve; the grouting pipe has a reduced diameter and enlarged end portion at the end portion on the anchoring side of the new type of expanded body anchor rod, and the other end of the grouting pipe has an external thread; the grouting pipe is provided with a rotating handle on the end portion with the external thread, and the inner side of the rotating handle has an internal thread to cooperate with the external thread on the grouting pipe; the sleeve has a plurality of pointed ends at the end portion on the anchoring side of the new type of expanded body anchor rod, and in the initial state, the free ends of the pointed ends at least do not extend beyond the reduced diameter and enlarged end portion of the grouting pipe.

[0007] While adopting the above technical solutions, the present invention can also adopt or combine the following technical solutions:

[0008] As a preferred technical solution of the utility model: the reduced diameter enlarged end portion is a wedge-shaped bolt, and the connection between the wedge-shaped bolt and the grouting pipe is wedge-shaped.

[0009] As a preferred technical solution of the utility model: the diameter-changing and enlarged end portion is a hollow structure.

[0010] As a preferred technical solution of the utility model: the diameter-changing and enlarged end portion is made of high-strength carbon steel.

[0011] As a preferred technical solution of the utility model: a plurality of grouting holes are arranged on the side wall of the grouting pipe.

[0012] As a preferred technical solution of the utility model: a plurality of grouting holes are arranged in a plum blossom shape.

[0013] As a preferred technical solution of the utility model: a gasket is provided between the rotating handle and the sleeve.

[0014] As a preferred technical solution of the utility model: the diameter of the sleeve is 25 mm and the length is 4 m; the diameter of the grouting pipe is 18 mm and the length is 4.2 m.

[0015] As a preferred technical solution of the utility model: the sleeve is a seamless steel pipe, and the grouting pipe is a seamless steel pipe.

[0016] The utility model provides a novel expanded anchor rod, which has the following beneficial effects: by turning the rotating handle, the variable diameter and expanded end portion of the grouting pipe at the anchoring end is pulled into the sleeve, so as to expand the sleeve, thereby enhancing the friction and holding force between the outer wall of the sleeve and the rock and soil body, and at the same time, the tip of the sleeve end can be inserted into the rock and soil body, further improving the anchoring effect between the anchor rod and the rock and soil body, reducing the anchoring length required for the anchor rod design, and there is no need to enlarge the borehole diameter or increase the borehole depth to achieve the required anchoring force, thereby reducing the construction difficulty and cost. At the same time, it is simple to operate and easy to promote, and the shape and length of the sleeve cutout (tip) can be flexibly changed according to the surrounding rock geological conditions to meet the needs of different constructions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A cross-sectional view of the new expanded anchor provided by the utility model;

[0018] Figure 2 is a partial cross-sectional view of a sleeve with a pointed end;

[0019] Figure 3 It is a schematic diagram of the sleeve tip when it is opened;

[0020] Figure 4 It is a top view;

[0021] In the figure: 1-sleeve; 2-grouting pipe; 3-rotating handle; 4-gasket; 11-tip; 21-grouting hole; 22-diameter-reducing and enlarged end. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1-4 As shown, a new type of expanded body anchor rod comprises a sleeve 1 and a grouting pipe 2 sleeved in the sleeve 1; the grouting pipe 2 has a reduced diameter enlarged end portion 22 at the end portion on the anchoring side of the new type of expanded body anchor rod, and the other end of the grouting pipe 2 has an external thread; the grouting pipe 2 is provided with a rotating handle 3 on the end portion with the external thread, and the inner side of the rotating handle 3 has an internal thread to match the external thread on the grouting pipe 2; the sleeve 1 has a plurality of tips 11 at the end portion on the anchoring side of the new type of expanded body anchor rod (in the present embodiment, a plurality of incisions are opened on the anchoring end of the sleeve 1, and the incisions form tips. Of course, in other embodiments, a plurality of tips 11 can also be directly provided on the side wall of the anchoring end of the sleeve 1), and in the initial state, the free end of the tip 11 at least does not exceed the reduced diameter enlarged end portion 22 of the grouting pipe 2.

[0024] The reduced diameter enlarged end portion 22 is a wedge-shaped bolt, and the connection between the wedge-shaped bolt and the grouting pipe 2 is wedge-shaped.

[0025] The reduced diameter enlarged end portion 22 is a hollow structure.

[0026] The reduced diameter enlarged end portion 22 is made of high-strength carbon steel.

[0027] A plurality of grouting holes 21 are arranged on the side wall of the grouting pipe 2 .

[0028] A plurality of grouting holes 21 are arranged in a plum blossom shape.

[0029] A gasket 4 is provided between the rotating handle 3 and the sleeve 1 .

[0030] The diameter of the sleeve 1 is 25 mm and the length is 4 m; the diameter of the grouting pipe 2 is 18 mm and the length is 4.2 m.

[0031] The sleeve 1 is a seamless steel pipe, and the grouting pipe 2 is a seamless steel pipe.

[0032] Specifically, the novel expanded anchor bolt is implemented in the following manner:

[0033] Drill a hole according to the designed hole diameter and depth, and flush the hole with high-pressure wind or high-pressure water; put the expanded anchor rod into the drill hole, turn the rotating handle 3, and when turning, give the rotating handle 3 a force applied in the anchoring direction, so that the rotating handle 3 and the sleeve 1 are relatively fixed, and the grouting pipe 2 is screwed outward to drive the variable diameter enlarged end 22 at the bottom to enter the sleeve 1, open the sleeve 1, and at the same time, the tip 11 of the sleeve 1 is inserted into the rock and soil; the prepared cement slurry is pressed into the grouting pipe 2 by the mud pump for grouting, and the slurry first flows into the rod body from the grouting hole 21, and after filling the rod body, it is injected into the rock and soil body through the incision on the bolt and the sleeve 1. After final setting, the expanded anchor rod forms an integral structure with the surrounding rock and soil. Grouting can improve the mechanical properties of the anchor body and the deep surrounding rock, improve the integrity of the surrounding rock, and at the same time, grouting can improve the anchoring effect of the anchor rod by improving the mechanical properties of the anchor body.

[0034] The above-mentioned specific implementation methods are used to explain the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent substitutions, improvements, etc. made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A new type of expanded anchor, characterized by: It comprises a sleeve (1) and a grouting pipe (2) sleeved in the sleeve (1); The grouting pipe (2) has a diameter-reducing and enlarged end portion (22) at the end portion on the anchoring side of the novel expanded anchor rod, and the other end of the grouting pipe (2) has an external thread; The grouting pipe (2) is provided with a rotating handle (3) at the end with external threads, and the inner side of the rotating handle (3) has internal threads to match with the external threads on the grouting pipe (2); The sleeve (1) has a plurality of tips (11) at the end of the anchoring side of the novel expanded anchor rod. In an initial state, the free ends of the tips (11) at least do not extend beyond the diameter-reducing and enlarged end (22) of the grouting pipe (2).

2. The novel expanded anchor rod according to claim 1 is characterized in that: The reduced diameter enlarged end portion (22) is a wedge-shaped bolt, and the connection between the wedge-shaped bolt and the grouting pipe (2) is wedge-shaped.

3. The novel expanded anchor rod according to claim 1 or 2, characterized in that: The diameter-changing and enlarged end portion (22) is a hollow structure.

4. The novel expanded anchor rod according to claim 1 is characterized in that: The reduced diameter enlarged end portion (22) is made of high-strength carbon steel.

5. The novel expanded anchor rod according to claim 1 is characterized in that: A plurality of grouting holes (21) are arranged on the side wall of the grouting pipe (2).

6. The novel expanded anchor rod according to claim 1 is characterized in that: A plurality of grouting holes (21) are arranged in a plum blossom shape.

7. The novel expanded anchor rod according to claim 1 is characterized in that: A gasket (4) is provided between the rotating handle (3) and the sleeve (1).

8. The novel expanded anchor rod according to claim 1 is characterized in that: The diameter of the sleeve (1) is 25 mm and the length is 4 m; the diameter of the grouting pipe (2) is 18 mm and the length is 4.2 m.

9. The novel expanded anchor rod according to claim 1 or 8, characterized in that: The sleeve (1) is a seamless steel pipe, and the grouting pipe (2) is a seamless steel pipe.

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