Full-length anchoring hollow grouting anchor rod with positive spiral wing plates

Abstract

The utility model discloses a positive spiral wing plate full-length anchoring hollow grouting anchor rod which comprises a hollow anchor rod body, an anchor rod tray, an anchor rod nut and a stop-grouting plug, two continuous positive spiral wing plates are fixedly arranged on the outer wall of the hollow anchor rod body, and the two positive spiral wing plates are symmetrically arranged in the axial direction of the hollow anchor rod body; a grouting hole is formed in the hollow anchor rod body, a hollow screw communicated with the hollow anchor rod body is fixedly arranged at the top end of the hollow anchor rod body, the anchor rod nut is in threaded connection with the hollow screw, the anchor rod tray and the stop-grouting plug can be arranged on the hollow screw in a sleeving mode, the anchor rod tray is located between the anchor rod nut and the hollow anchor rod body, and the stop-grouting plug is located between the anchor rod nut and the hollow anchor rod body. The stop-grouting plug is located between the anchor rod tray and the hollow anchor rod body. The problems existing in actual engineering application of an existing grouting anchor rod are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rock mass reinforcement, in particular to a full-length anchorage hollow grouting bolt with a positive spiral wing plate. Background Technique

[0002] With the rapid development of social economy, geotechnical engineering has become an indispensable foundation and prerequisite for various engineering constructions. During the construction of geotechnical engineering, in order to prevent natural disasters such as collapses and landslides, rock masses with poor geological conditions are usually reinforced to improve their bearing capacity and stability, ensuring the safety and reliability of the project.

[0003] At present, anchoring technology is usually used to reinforce rock masses, and grouting bolts play a crucial role among them. Traditional grouting bolts mostly use hollow threaded steel as the main material and are widely used because of their strong bearing capacity. However, in actual engineering applications, there are still some deficiencies. For example, the bonding strength between the threaded steel bolt and grouting materials such as cement mortar is insufficient, which may cause the two to separate, reducing the effect of reinforcing the rock mass and even losing the original reinforcing effect. In addition, during the process of inserting the threaded steel bolt into the drill hole opened in the rock mass, there may be a large verticality deviation, which will cause uneven stress when the bolt bears external loads, making the external loads unable to be effectively transmitted and easily causing problems such as deformation and fracture. Summary of the Invention

[0004] The utility model provides a full-length anchorage hollow grouting bolt with a positive spiral wing plate to overcome the problems existing in the actual engineering application of existing grouting bolts.

[0005] To achieve the above purpose, the technical solution of the utility model is:

[0006] A full-length anchorage hollow grouting bolt with a positive spiral wing plate, comprising: a hollow bolt body, a bolt tray, a bolt nut and a grout stopper. Two continuous positive spiral wing plates are fixedly arranged on the outer wall of the hollow bolt body, and the two positive spiral wing plates are symmetrically arranged along the axial direction of the hollow bolt body;

[0007] A grouting hole is opened on the hollow bolt body. A hollow screw rod communicated with the hollow bolt body is fixedly arranged at the top end of the hollow bolt body. The bolt nut is threadedly connected with the hollow screw rod. The bolt tray and the grout stopper can be sleeved on the hollow screw rod. The bolt tray is located between the bolt nut and the hollow bolt body, and the grout stopper is located between the bolt tray and the hollow bolt body.

[0008] Further, the bolt tray is a butterfly tray.

[0009] Further, the grouting hole is arranged at the bottom of the hollow bolt body.

[0010] Furthermore, the torsion angle of the positive spiral wing plate is not greater than 45 degrees and greater than 0 degrees.

[0011] Furthermore, the torsion angle of the positive spiral wing plate is 45 degrees.

[0012] Beneficial effects:

[0013] A full-length anchored hollow grouting bolt with a positive spiral wing plate provided by the present utility model ensures that the hollow bolt body can be more easily maintained in the central position within the drill hole when inserted into the drill hole in the rock mass by arranging two continuous positive spiral wing plates on the hollow bolt body, thereby ensuring the perpendicularity of the hollow bolt body, making the hollow grouting bolt more uniform in stress when stressed, effectively transmitting external loads, and avoiding deformation and fracture of the hollow grouting bolt;

[0014] By arranging a grout plug, the grouting pressure is maintained during the process of injecting cement mortar into the drill hole by the hollow bolt body, and leakage of the cement mortar is effectively prevented. By arranging a bolt tray, the hollow grouting bolt can bear greater rock mass stress. By tightening the bolt nut, the bolt tray is closely attached to the rock mass, thereby concentrating the rock mass stress on the bolt tray;

[0015] Meanwhile, by arranging the positive spiral wing plate, the hollow grouting bolt and the cement mortar are mutually embedded and engaged with each other, making full use of the differential geometric characteristics of the positive spiral wing plate, increasing the contact area between the positive spiral wing plate and the cement mortar, significantly enhancing the bonding firmness between the hollow grouting bolt and the cement mortar. Under the action of tension, the hollow bolt body with the positive spiral wing plate extrudes the cement mortar in contact with it, resulting in an increase in the shear strength of the interface between the cement mortar and the rock mass, thereby significantly improving the pull-out resistance of the hollow grouting bolt and ensuring the reinforcement effect of the hollow grouting bolt on the rock mass. Description of the drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is an exploded structural schematic diagram of a full-length anchored hollow grouting bolt with a positive spiral wing plate disclosed by the present utility model;

[0018] Figure 2 It is a schematic diagram of a full-length anchored hollow grouting bolt with a positive spiral wing plate disclosed by the present utility model applied to a rock mass;

[0019] Figure 3For Figure 2 Enlarged schematic view at position C of

[0020] Figure 4 Schematic structural view of two positive spiral wing plates of a full - length anchored hollow grouting bolt with positive spiral wing plates disclosed by the present utility model;

[0021] Figure 5 Schematic view of the torsion angle of the positive spiral wing plate of a full - length anchored hollow grouting bolt with positive spiral wing plates disclosed by the present utility model;

[0022] Figure 6 Schematic structural view of the hollow screw of a full - length anchored hollow grouting bolt with positive spiral wing plates disclosed by the present utility model;

[0023] Figure 7 Schematic structural view of the hollow bolt body of a full - length anchored hollow grouting bolt with positive spiral wing plates disclosed by the present utility model.

[0024] In the figure:

[0025] 1. Hollow bolt body; 2. Bolt tray; 3. Bolt nut; 4. Positive spiral wing plate; 5. Grouting hole; 6. Hollow screw; 7. Grout stopper; A. Rock mass; B. Cement mortar. Detailed implementation method

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present utility model belong to the scope of protection of the present utility model.

[0027] This embodiment provides a full - length anchored hollow grouting bolt with positive spiral wing plates. As Figure 1 shown, it includes: a hollow bolt body 1, a bolt tray 2, a bolt nut 3 and a grout stopper 7. Two continuous positive spiral wing plates 4 are welded to the outer wall of the hollow bolt body 1. As Figure 4 shown, the two positive spiral wing plates 4 are symmetrically arranged along the axial direction of the hollow bolt body 1;

[0028] As Figure 7 shown, a grouting hole 5 is provided on the hollow bolt body 1. A hollow screw 6 communicating with the hollow bolt body 1 is welded to the top end of the hollow bolt body 1. The bolt nut 3 is threadedly connected to the hollow screw 6. The bolt tray 2 and the grout stopper 7 can be sleeved on as Figure 6On the hollow screw rod 6 shown, the anchor tray 2 is located between the anchor bolt nut 3 and the hollow anchor rod body 1, and the grout plug 7 is located between the anchor tray 2 and the hollow anchor rod body 1;

[0029] A full-length anchored hollow grouting anchor bolt with positive spiral vanes (hereinafter referred to as the hollow grouting anchor bolt) provided in this embodiment, by arranging two continuous positive spiral vanes 4 on the hollow anchor rod body 1, to ensure that when inserting into the drill hole on the rock mass A, the hollow anchor rod body 1 can more easily maintain a centered position in the drill hole, thereby ensuring the perpendicularity of the hollow anchor rod body 1, making the hollow grouting anchor bolt more uniform when stressed, so as to effectively transfer external loads and avoid deformation and fracture of the hollow grouting anchor bolt;

[0030] By setting the grout plug 7, the grouting pressure is maintained during the process of injecting cement mortar B into the drill hole by the hollow anchor rod body 1, and the leakage of the cement mortar B is effectively prevented. By setting the anchor tray 2, the hollow grouting anchor bolt can bear greater rock mass stress. By tightening the anchor bolt nut 3, the anchor tray 2 is closely attached to the rock mass A, so that the rock mass stress is concentrated on the anchor tray 2;

[0031] At the same time, by arranging the positive spiral vanes 4, the hollow grouting anchor bolt and the cement mortar B are mutually embedded and engaged. By making full use of the differential geometric characteristics of the positive spiral vanes 4, the contact area between the positive spiral vanes 4 and the cement mortar is increased, the action relationship between the hollow grouting anchor bolt and the cement mortar B is improved, the load sharing between the hollow grouting anchor bolt and the cement mortar B is optimized, and the bonding firmness between the hollow grouting anchor bolt and the cement mortar B is significantly enhanced. Under the action of tension, most of the loads are borne by the hollow anchor rod body 1 welded with the positive spiral vanes 4 and are transmitted to the cement mortar B in the form of compressive stress. The hollow anchor rod body 1 with the positive spiral vanes 4 squeezes the cement mortar B in contact with it, resulting in an increase in the radial stress at the interface between the cement mortar B and the rock mass. Under this condition, according to the Mohr-Coulomb strength criterion, the shear strength at the interface between the cement mortar B and the rock mass increases, so that the pull-out resistance of the hollow grouting anchor bolt is significantly improved, the bearing capacity and stability of the hollow grouting anchor bolt are improved, the reinforcement effect of the hollow grouting anchor bolt on the rock mass A is ensured, and the hollow anchor rod body 1 with the positive spiral vanes 4 makes the hollow grouting anchor bolt have a wide application prospect in geotechnical engineering and can adapt to complex geological conditions.

[0032] In a specific embodiment, as Figures 1 to 3 shown, the anchor tray 2 is a butterfly tray, and a cavity is formed by the upward bulge in the middle of the butterfly tray. The grout plug 7 is frustum-shaped. The small-diameter end of the grout plug 7 is inserted into the drill hole, and the large-diameter end of the grout plug 7 protrudes out of the drill hole and is located in the cavity, and the grout plug 7 is pressed by the anchor tray 2.

[0033] In a specific embodiment, as Figure 7As shown, the grouting holes 5 are arranged at the bottom of the hollow anchor rod body 1 to ensure that the cement mortar B can better fill the drill hole. In this embodiment, two grouting holes 5 are symmetrically formed at the bottom of the hollow anchor rod body 1.

[0034] In a specific embodiment, the torsion angle of the positive spiral wing plate 4 is not greater than 45 degrees and greater than 0 degrees. Preferably, as Figure 5 shown, the torsion angle α of the positive spiral wing plate 4 is 45 degrees. In actual production, a steel plate meeting the design requirements can be processed by the torsion method. The two ends in the long axis direction of the steel plate are respectively fixed on the torsion machine, and a torque is applied to the steel plate in the long axis direction through the torsion machine to twist the steel plate, so that the angle formed by the edge of the steel plate and the long axis direction is 45°, to obtain the positive spiral wing plate 4. The torsion angle of the steel plate generally does not exceed 45° to prevent excessive plastic deformation of the steel.

[0035] In actual use, after drilling a hole at the position on the rock mass A where the hollow grouting anchor rod needs to be inserted, the dust, soil, gravel and other attachments in the drill hole are removed to avoid the attachments reducing the bonding strength between the cement mortar B and the drill hole wall. Then, the hollow anchor rod body 1 welded with the positive spiral wing plate 4 is inserted into the drill hole. Subsequently, a grout stopper 7, an anchor tray 2 and an anchor nut 3 are installed on the hollow screw 6, and the cement mortar B is injected into the hollow anchor rod body 1 from the hollow screw 6, so that the cement mortar B is injected into the drill hole from the grouting holes 5 at the bottom of the hollow anchor rod body 1. During grouting, the control of the grouting volume and the grouting pressure is well done. When the grouting is full and the grouting pressure reaches the design value, the grouting machine can be turned off, and the anchor nut 3 is tightened after grouting is completed to make the hollow anchor rod body 1 generate prestress. After the cement mortar B is fully solidified and cured, the hollow grouting anchor rod and the surrounding rock mass A form a firm anchoring system.

[0036] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A full-length hollow grouting anchor bolt with a positive spiral wing plate, characterized in that: include: A hollow anchor body (1), an anchor tray (2), an anchor nut (3) and a grout stopper (7), wherein the outer wall of the hollow anchor body (1) is fixedly provided with two continuous positive spiral wing plates (4), and the two positive spiral wing plates (4) are symmetrically arranged along the axis of the hollow anchor body (1); The hollow anchor body (1) is provided with a grouting hole (5); a hollow screw (6) connected to the hollow anchor body (1) is fixedly provided at the top end of the hollow anchor body (1); the anchor nut (3) is threadedly connected to the hollow screw (6); the anchor tray (2) and the grouting stopper (7) can be sleeved on the hollow screw (6); the anchor tray (2) is located between the anchor nut (3) and the hollow anchor body (1); and the grouting stopper (7) is located between the anchor tray (2) and the hollow anchor body (1).

2. A full-length hollow grouting anchor bolt for positive spiral wing plates according to claim 1, characterized in that: The anchor rod tray (2) is a butterfly-shaped tray.

3. A full-length hollow grouting anchor bolt for positive spiral wing plates according to claim 1, characterized in that: The grouting hole (5) is arranged at the bottom of the hollow anchor body (1).

4. A full-length hollow grouting anchor bolt for positive spiral wing plates according to claim 1, characterized in that: The torsion angle of the positive spiral wing plate (4) is not greater than 45 degrees and greater than 0 degrees.

5. A full-length hollow grouting anchor bolt for positive spiral wing plates according to claim 4, characterized in that: The torsion angle of the positive spiral wing plate (4) is 45 degrees.

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