Prestressed threaded grouting anchor rod

Abstract

The utility model relates to the technical field of geotechnical engineering construction tools, and discloses a prestressed threaded grouting anchor rod which comprises a rod body, a rod body fixing structure arranged close to the tail of the rod body, and an anchor head arranged close to the head of the rod body. The anchor head comprises a sleeve fixedly arranged on the rod body in a sleeving mode and an opening part in threaded connection with the outer side of the sleeve. The diameter of the end, close to the rod body head, of the sleeve is larger than that of the end close to the rod body tail. The expansion shell head is in threaded connection with the outer side of the sleeve and can expand in the annular direction, and the outer shell is arranged outside the expansion shell head in a sleeving mode and can expand in the annular direction. The expansion shell head capable of being opened is arranged at the end of the rod body in a sleeved mode, the outer shell capable of being opened is arranged outside the expansion shell head in a sleeved mode, the outer shell is opened to be tightly meshed with a drill hole so that the anchor rod can be fixed, operation is easy, the structure is simple, and manufacturing cost is relatively low.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering construction tools, and particularly relates to a prestressed threaded grouting bolt. Background Art

[0002] Anchoring technology is a stress transfer method used in engineering to improve the stability of rock and soil masses. By installing bolts or cables and applying prestress, stress closure is generated in the rock and soil masses, thereby improving their anti-slip and anti-shear capabilities. Geotechnical anchoring technology plays a crucial role in enhancing the stability and safety of buildings, reducing displacement, and minimizing the impact of external forces.

[0003] Existing anchoring devices are relatively troublesome to operate. For example, in the Chinese invention patent with the document number CN110670599B, this solution requires two drilling operations. When inserting the rod body, the drill rod or nut needs to be continuously rotated, and attention should be paid to keeping the expansion part closed during insertion. Otherwise, friction will occur with the rock mass during the insertion process, affecting the insertion work. This structure is relatively complex, with a relatively high manufacturing cost and a cumbersome operation process. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a prestressed threaded grouting bolt. By sleeving an expandable shell head at the end of the rod body and sleeving an expandable outer shell outside the shell head, the bolt can be fixed by expanding the outer shell to bite the drilling hole. The operation is relatively simple, the structure is also simple, and the manufacturing cost is relatively low.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions: A prestressed threaded grouting bolt includes a rod body, a rod body fixing structure disposed near the tail of the rod body, and an anchor head disposed near the head of the rod body; the anchor head includes a sleeve fixedly sleeved on the rod body and an expansion part threadedly connected to the outside of the sleeve; the diameter of one end of the sleeve near the head of the rod body is larger than the diameter of the end near the tail of the rod body; the expansion part includes a shell head that is threadedly connected to the outside of the sleeve and can expand circumferentially and an outer shell that is sleeved outside the shell head and can expand circumferentially; initially, a section of the sleeve near the tail of the rod body is threadedly connected to a section of the shell head near the head of the rod body.

[0006] Further, the rod body fixing structure includes a nut, a nut gasket, and a backing plate sequentially disposed near the tail of the rod body; the nut, the nut gasket, and the backing plate are sequentially disposed in the direction from the tail of the rod body to the head of the rod body; the nut is threadedly connected to the rod body, and both the nut gasket and the backing plate are sleeved outside the rod body.

[0007] Further, the outside of the sleeve is provided with sleeve threads, and the inside of the shell head is provided with internal threads that cooperate with the sleeve threads.

[0008] Further, the expanding shell head includes at least two shell heads arranged at an interval, the cross-section of the shell head is arc-shaped, and the inner sides of all the shell heads are threadedly connected to the sleeve.

[0009] Further, the diameter of the expanding shell head at one end close to the tail of the rod body is greater than the diameter at one end close to the head of the rod body.

[0010] Further, the outer shell includes a circular base arranged close to the end face of the rod body head and an arc-shaped steel connected to the circular base and arranged around the expanding shell head; there are at least two arc-shaped steels, and they are arranged at an interval from each other; the diameter of the circular base is less than or equal to the minimum diameter of the expanding shell head.

[0011] Further, the expanding shell head is provided with a groove in the radial direction, and the arc-shaped steel is provided with a protrusion inserted into the groove in the radial direction.

[0012] The beneficial effects of the present utility model are as follows: By sleeving an expandable expanding shell head at the end of the rod body and sleeving an expandable outer shell outside the expanding shell head, the outer shell can be expanded and clamped with the drill hole to realize the fixation of the anchor rod. The operation is relatively simple, the structure is also simple, and the manufacturing cost is relatively low; moreover, the grouting speed is fast and the efficiency is high; when the expanding shell head rotates through the rod body, the sleeve makes the outer shell enter the rock and soil body, applying an initial tensile force to the surrounding rock, which can quickly restrain the surrounding rock, form a stress arch in the surrounding rock, and timely control the deformation of the surrounding rock. Description of the Drawings

[0013] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 is a partial structural schematic diagram of the initial position of the sleeve of the present utility model.

[0015] In the figure: 1. Rod body; 2. Nut; 3. Nut gasket; 4. Backing plate; 5. Expanding shell head; 6. Outer shell; 7. Groove; 8. Protrusion; 9. Sleeve; 10. Anchor head; 11. Arc-shaped steel; 12. Circular base. Specific Embodiments

[0016] The present utility model will be further explained below in conjunction with the drawings and specific embodiments.

[0017] Embodiment:

[0018] As Figure 1 - Figure 2As shown, a prestressed threaded grouting anchor rod comprises a rod body 1 inserted into a borehole, a rod body fixing structure arranged near the tail of the rod body 1, and an anchor head 10 arranged near the head of the rod body 1; the anchor head 10 comprises a sleeve 9 fixedly sleeved on the rod body 1 and an opening portion threadedly connected to the outer side of the sleeve 9; the diameter of one end of the sleeve 9 near the head of the rod body 1 is larger than the diameter of the other end near the tail of the rod body 1; the opening portion comprises an expansion head 5 threadedly connected to the outer side of the sleeve 9 and capable of circumferential expansion, and an outer shell 6 sleeved on the outside of the expansion head 5 and capable of circumferential expansion; initially, a section of the sleeve 9 near the tail of the rod body 1 is threadedly connected to a section of the expansion head 5 near the head of the rod body 1; from Figure 2 In the middle view, when the rod body 1 is not rotated, a section of the left end of the sleeve 9 is threadedly connected with one end of the right end of the shell expansion head 5, and at this time, the larger diameter part of the sleeve 9 does not contact the shell expansion head; when pulled, the larger diameter part of the sleeve 9 rotates and moves to the left, and when moving, it will open the shell expansion head 5, and then open the arc steel 11; Figure 1 and Figure 2 The left end is the tail of the rod body, and the right end is the head of the rod body.

[0019] The rod body fixing structure includes a nut 2, a nut washer 3 and a pad 4 which are arranged in sequence near the tail of the rod body 1; the nut 2, the nut washer 3 and the pad 4 are arranged in sequence from the tail of the rod body 1 to the head of the rod body 1; the rod body 1 is hollow and has openings at both ends, and an external thread is arranged on the outside of the rod body 1; the nut 2 is threadedly connected to the rod body 1 through the external thread, and the nut washer 3 and the pad 4 are both sleeved on the outside of the rod body 1.

[0020] The outer side of the sleeve 9 is provided with a sleeve thread, and the inner side of the expansion head 5 is provided with an internal thread matched with the sleeve thread; the sleeve 9 is in a truncated cone shape.

[0021] The shell expansion head 5 includes at least two shell heads which are spaced apart from each other. The cross section of the shell heads is arc-shaped, and the inner sides of all the shell heads are threadedly connected to the sleeve 9 .

[0022] The diameter of the expansion head 5 near the tail of the rod body 1 is larger than the diameter of the end near the head of the rod body 1. The diameter here refers to the outer diameter of the expansion head 5, and the inner diameter of each cross section of the expansion head 5 remains unchanged.

[0023] The outer shell 6 includes a circular base 12 arranged near the end face of the head of the rod body 1 and an arc steel 11 connected to the circular base 12 and arranged around the shell expansion head 5; there are at least two arc steels 11, which are arranged at a distance from each other; the diameter of the circular base 12 is less than or equal to the minimum diameter of the shell expansion head 5; the arc steel 11 is in contact with the outer side of the shell expansion head 5.

[0024] The expanding shell head 5 is provided with a groove 7 along the radial direction. The arc-shaped steel 11 is provided with a protrusion 8 along the radial direction and inserted into the groove 7. The cross-sectional dimension of the groove 7 can be set to be larger than that of the protrusion 8, so that the protrusion 8 has a certain movement space in the groove 7 but also plays a role in limiting the outer shell 6; it can also be set to be equal.

[0025] By sleeving an expandable expanding shell head 5 on the head of the rod body 1 and sleeving an expandable outer shell 6 outside the expanding shell head 5, the rod body can be fixed by expanding the outer shell 6 to bite with the drill hole. The operation is relatively simple, the structure is also simple, and the manufacturing cost is relatively low; moreover, the grouting speed is fast and the efficiency is high; through the action of the sleeve 9 when the rod body 1 rotates, the expanding shell head 5 enables the outer shell 6 to enter the rock and soil body, applying an initial tensile force to the surrounding rock, which can quickly restrain the surrounding rock, form a stress arch in the surrounding rock, and timely control the deformation of the surrounding rock.

[0026] In order to enable the arc-shaped steel 11 to bend and expand, a material with a certain elasticity is selected.

[0027] Construction process: First, carry out drilling operations. After the operation is completed, empty it, and then start the anchoring. During anchoring, first install the anchor head 10 at the head of the rod body 1, install the backing plate 4, nut gasket 3 and nut 2 at the tail of the rod body 1, then insert the anchor head 10 and the rod body 1 into the drill hole. After the anchor head 10 touches the bottom of the hole, pull and rotate the rod body 1 outward (the thread directions on the rod body 1, expanding shell head 5 and sleeve 9 are designed according to needs). At this time, since the diameters at both ends of the sleeve 9 are different, the movement of the sleeve 9 will drive the expanding shell head 5, making the expanding shell head fully expand. The expanding shell head pushes the outer shell 6, making the outer shell 6 bite with the drill hole wall. Then apply an initial tensile force to the rod body 1. After the grouting is completed, tighten the nut 2 to make the backing plate 4 fully contact the rock wall, and the anchoring is completed.

[0028] The above is only used to illustrate the technical solution of the present invention and not to limit it. Other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should all be covered within the scope of the claims of the present invention.

Claims

1. A prestressed threaded grouting anchor, characterized in that: The invention comprises a rod body (1), a rod body fixing structure arranged near the tail of the rod body (1), and an anchor head (10) arranged near the head of the rod body (1); the anchor head (10) comprises a sleeve (9) fixedly sleeved on the rod body (1) and an opening portion threadedly connected to the outer side of the sleeve (9); the diameter of one end of the sleeve (9) near the head of the rod body (1) is larger than the diameter of one end near the tail of the rod body (1); the opening portion comprises an expansion head (5) threadedly connected to the outer side of the sleeve (9) and capable of circumferential expansion, and an outer shell (6) sleeved outside the expansion head (5) and capable of circumferential expansion; initially, a section of the sleeve (9) near the tail of the rod body (1) is threadedly connected to a section of the expansion head (5) near the head of the rod body (1).

2. A prestressed threaded grouting anchor according to claim 1, characterized in that: The rod body fixing structure comprises a nut (2), a nut washer (3) and a backing plate (4) which are arranged in sequence near the rear end of the rod body (1); the nut (2), the nut washer (3) and the backing plate (4) are arranged in sequence from the rear end of the rod body (1) to the head end of the rod body (1); the nut (2) is connected to the rod body (1) by threading, and the nut washer (3) and the backing plate (4) are both sleeved on the outside of the rod body (1).

3. A prestressed threaded grouting anchor according to claim 1, characterized in that: The outer side of the sleeve (9) is provided with a sleeve thread, and the inner side of the expansion head (5) is provided with an internal thread that matches the sleeve thread.

4. A prestressed threaded grouting anchor according to claim 1, characterized in that: The expansion shell head (5) comprises at least two shell heads which are spaced apart from each other, the cross section of the shell heads is arc-shaped, and the inner sides of all the shell heads are threadedly connected to the sleeve (9).

5. A prestressed threaded grouting anchor according to claim 4, characterized in that: The diameter of the expansion head (5) at one end close to the tail of the rod body (1) is larger than the diameter of the end close to the head of the rod body (1).

6. A prestressed threaded grouting anchor according to claim 5, characterized in that: The outer shell (6) comprises a circular base (12) arranged near the end surface of the head of the rod body (1) and an arc-shaped steel (11) connected to the circular base (12) and arranged around the shell expansion head (5); there are at least two arc-shaped steels (11) which are arranged at a distance from each other.

7. The prestressed threaded grouting anchor according to claim 1, characterized in that: The shell expansion head (5) is provided with a groove (7) in the radial direction, and the arc-shaped steel (11) is provided with a protrusion (8) in the radial direction for inserting into the groove (7).

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