Combined type hollow anchor rod device suitable for slope support

Abstract

The combined type hollow anchor rod device suitable for slope supporting comprises an anchor rod body, and the anchor rod body is composed of a first anchor rod body and a plurality of second anchor rod bodies; the upper end of the first anchor rod body is open, and the end of the first anchor rod body is sequentially sleeved with a connector sleeve and an end sleeve barrel from inside to outside. The joint sleeve, the stop-grouting plug and the end plate are all provided with inserting holes in advance, exhaust pipes are arranged in the inserting holes in a penetrating mode, one ends of the exhaust pipes are located in a cavity formed by the joint sleeve and the end sleeve barrel, and the other ends of the exhaust pipes sequentially penetrate through the inserting holes in the joint sleeve, the stop-grouting plug and the end plate to stretch out of the rock mass anchoring hole. The length of the anchor rod body can be flexibly adjusted according to the depth of a rock mass anchoring hole and geological conditions, the through hole and the second through hole form a synergistic dual grouting channel, it is ensured that rock mass pores and cracks are fully filled with grout, the exhaust pipe can effectively exhaust air and grout bubbles in the rock mass pores, air bags are prevented from being formed in the grouting process, and the grouting quality is improved. And the anchoring space can be fully filled with slurry.

Description

Technical Field

[0001] The present invention relates to the technical field of hollow anchor rod devices, in particular to a combined hollow anchor rod device suitable for slope support. Background Art

[0002] In the field of slope engineering support, anchor rods are an important rock and soil reinforcement component. Among them, hollow anchor rods have both anchoring and grouting functions. They can inject slurry into the rock anchor hole through the hollow channel, so that the slurry fills the rock pores and forms an overall force system with the anchor rods, further enhancing the support effect. It has become a commonly used technical means in current slope support projects.

[0003] However, the existing hollow anchor rods used for slope support still have many technical defects in practical applications. Specifically, the existing slope support anchor rods are mostly integral structures with fixed and non-adjustable lengths. When faced with anchor holes in slope rock masses of different depths and geological conditions, the rod length cannot be flexibly adjusted according to construction requirements, resulting in poor construction adaptability.

[0004] At the same time, due to the limitations of the anchor rod structure design, the slurry flow path between the grouting channel and the rock anchor hole is unreasonable. The slurry is difficult to penetrate evenly into the rock pores under pressure, and local slurry aggregation or voids are easily formed, resulting in uneven slurry distribution. The air inside the anchor hole is not easy to be discharged, and air pockets are easily formed during the grouting process, which cannot be fully filled.

[0005] Furthermore, traditional anchor bolts with segmented connections often suffer from poor sealing performance at the joints. During the grouting process, slurry easily seeps into the joint gaps, corroding the metal structure at the rod connection and reducing the anchor bolt's corrosion resistance. Summary of the Invention

[0006] (1) Technical issues

[0007] The present invention aims to provide a combined hollow anchor device suitable for slope support, so as to solve the problems of poor construction flexibility, poor grouting effect, easy corrosion at the connection and insufficient anchoring stability existing in the existing slope support anchor rods, and improve the reliability and durability of slope support.

[0008] (2) Technical content

[0009] In order to solve the above technical problems, the technical solution of the present invention is as follows: a combined hollow anchor device suitable for slope support, comprising an anchor body, wherein the anchor body is composed of a first anchor body and a plurality of second anchor bodies arranged in sequence along the length direction, the first anchor body and the second anchor body and the adjacent second anchor bodies are connected and fixed by a connecting sleeve, the connecting sleeve is a hollow structure and the side wall is provided with a through hole for grouting material to overflow; the upper end of the first anchor body is open and the end head is sequentially provided with a joint sleeve and an end sleeve barrel from the inside to the outside, The end sleeve barrel cover is on the outside of the joint sleeve and the barrel wall of the end sleeve barrel is provided with several through holes along its circumference; the outer wall of the second anchor rod at the end of the anchor rod body is provided with a grouting plug with a conical structure which is narrow in front and wide in the back, and the end of the second anchor rod body and behind the grouting plug are sequentially provided with an end plate and a pre-tightening nut, and the joint sleeve, the grouting plug and the end plate are all preset with plug holes, and an exhaust pipe is passed through the plug hole, one end of the exhaust pipe is located in the cavity formed by the joint sleeve and the end sleeve barrel and the other end passes through the joint sleeve, the grouting plug and the plug holes on the end plate in sequence and extends to the outside of the rock anchor hole.

[0010] Furthermore, the first anchor rod body and the second anchor rod body are threadedly connected via a connecting sleeve, and the connection is coated with epoxy resin adhesive.

[0011] Furthermore, the exhaust pipe is made of silica gel and is used to discharge air and slurry bubbles in the pores of the rock mass.

[0012] Furthermore, the end sleeve barrel and the joint sleeve expand and deform due to friction during installation, thereby enhancing the fixing effect with the rock hole wall.

[0013] Furthermore, the first anchor rod body, the second anchor rod body and the connecting sleeve are all Q460 high-strength round steel pipes.

[0014] Furthermore, the distribution of the through hole and the second through hole ensures that the grouting material uniformly fills the pores of the rock mass.

[0015] (3) Technical effects

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. The combined assembly is achieved by threading the first anchor rod body, multiple second anchor rod bodies and the connecting sleeve. The length of the anchor rod body can be flexibly adjusted according to the depth of the rock anchor hole and geological conditions. There is no need to customize anchor rods of specific length, which significantly improves construction adaptability and efficiency.

[0018] 2. The through holes on the side wall of the connecting sleeve and the through holes on the barrel wall of the end sleeve form a synergistic double grouting channel. The grouting material can overflow evenly through these through holes, ensuring that the slurry fully fills the pores and cracks in the rock mass and avoids local aggregation or voids.

[0019] 3. The silicone exhaust pipe can effectively discharge the air and slurry bubbles in the rock pores, avoid the formation of air pockets during the grouting process, and ensure that the slurry can fully fill the anchoring space.

[0020] 4. When the first anchor rod body and the second anchor rod body are connected by a connecting sleeve thread, the epoxy resin adhesive coated on the connection can effectively seal the thread gap, prevent the grouting material from penetrating into the connection and corroding the metal structure, and significantly improve the anti-corrosion performance of the anchor rod.

[0021] 5. The end sleeve barrel and the joint sleeve expand and deform due to friction during installation. After deformation, they can fit tightly against the rock hole wall, enhancing the fixing effect with the rock hole wall. In conjunction with the slurry stopper, end plate and pre-tightening nut, the overall anchoring stability of the anchor rod is further improved, ensuring the long-term reliability of the slope support. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a combined hollow anchor device suitable for slope support according to the present invention.

[0023] As shown in the figure: 1. First anchor rod body; 2. Second anchor rod body; 3. Connecting sleeve; 4. End sleeve barrel; 5. Joint sleeve; 6. Exhaust pipe; 7. Slurry stop plug; 8. End plate; 9. Pre-tightening nut; 31. Through hole; 41. Second through hole. DETAILED DESCRIPTION

[0024] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "inside", "outside", "center", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction structure and operation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "provided with," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, direct connections, indirect connections via an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] The present invention will be described in further detail below with reference to the accompanying drawings.

[0027] Combined with attachment Figure 1A combined hollow anchor device suitable for slope support includes an anchor body, which is composed of a first anchor body 1 and a plurality of second anchor bodies 2 arranged in sequence along the length direction. The first anchor body 1 and the second anchor body 2 and the adjacent second anchor bodies 2 are connected and fixed by a connecting sleeve 3. The connecting sleeve 3 is a hollow structure and the side wall is provided with a through hole 31 for grouting material to overflow; the upper end of the first anchor body 1 is open and the end is sequentially covered with a joint sleeve 5 and an end sleeve barrel 4 from the inside to the outside, and the end sleeve barrel 4 is covered on the outside of the joint sleeve 5 The barrel wall of the end sleeve barrel 4 is provided with a plurality of through holes 41 along its circumference; the outer wall of the second anchor rod body 2 at the end of the anchor rod body is provided with a grouting plug 7 with a conical structure that is narrow in front and wide in the back, and the end of the second anchor rod body 2 and behind the grouting plug 7 are provided with an end plate 8 and a pre-tightening nut 9 in sequence, and the joint sleeve 5, the grouting plug 7 and the end plate 8 are all preset with plug holes, and an exhaust pipe 6 is passed through the plug hole, one end of the exhaust pipe 6 is located in the cavity formed by the joint sleeve 5 and the end sleeve barrel 4, and the other end passes through the plug holes on the joint sleeve 5, the grouting plug 7 and the end plate 8 in sequence and extends to the outside of the rock anchor hole.

[0028] The first anchor rod body 1 and the second anchor rod body 2 are threadedly connected through a connecting sleeve 3, and the connection is coated with epoxy resin adhesive. The first anchor rod body 1, the second anchor rod body 2 and the connecting sleeve 3 are all Q460 high-strength circular steel pipes. The distribution of the through hole 31 and the through hole 2 41 ensures that the grouting material evenly fills the rock pores.

[0029] The exhaust pipe 6 is made of silica gel and is used to discharge air and slurry bubbles in the rock pores. The end sleeve barrel 4 and the joint sleeve 5 expand and deform due to friction during installation, thereby enhancing the fixing effect with the rock pore wall.

[0030] The working principle of the present invention is as follows: during construction, first, according to the depth of the rock anchor hole, the first anchor rod body 1 is connected to multiple second anchor rod bodies 2 through a connecting sleeve 3 to form an anchor rod body. The epoxy resin adhesive coated at the connection ensures sealing and a firm connection. Subsequently, the end sleeve barrel 4 and the joint sleeve 5 are placed into the anchor hole, and then the assembled anchor rod body is placed into the rock anchor hole and slowly pushed into the hole. As the anchor rod body is advanced, the joint sleeve gradually moves toward the inside of the end sleeve barrel. As the joint sleeve moves, the end sleeve barrel generates heat due to friction, expands and deforms, thereby increasing the friction between it and the hole wall, and finally firmly fixing the entire anchor rod in the rock. At this time, the grouting plug 7 with a conical structure fitted on the outer wall of the second anchor rod body 2 at the end of the anchor rod body plays a role in initially blocking the outflow of slurry. Next, an end plate 8 and a pre-tightening nut 9 are sequentially installed at the end of the second anchor rod body 2 and behind the grouting plug 7. By tightening the pre-tightening nut 9, the end plate 8 squeezes the grouting plug 7, further enhancing the fit and sealing between the grouting plug 7 and the rock hole wall.

[0031] The end sleeve barrel 4 is placed over the joint sleeve 5, forming a cavity. A silicone exhaust pipe 6, with one end positioned within the cavity formed by the joint sleeve 5 and the end sleeve barrel 4, extends out of the rock anchor hole through the joint sleeve 5, the grout stopper 7, and the end plate 8. This pipe is used to expel air and slurry bubbles from the rock pores.

[0032] During the grouting process, the grouting material is injected from the opening at the tail end of the second anchor rod body 2. Since the first anchor rod body 1, the second anchor rod body 2 and the connecting sleeve 3 are all hollow structures, the grouting material flows along the hollow channel. During the flow process, the grouting material will overflow through the through hole 31 on the side wall of the connecting sleeve 3, filling the gap between the anchor rod body and the rock hole wall and the rock pores. When the grouting material flows to the upper end of the first anchor rod body 1, it will enter the cavity formed by the joint sleeve 5 and the end sleeve barrel 4, and overflow again through the through hole 2 41 on the barrel wall of the end sleeve barrel 4, realizing double grouting and ensuring that the slurry evenly fills the rock pores. In this process, as the grouting proceeds, the air and slurry bubbles in the rock pores will be discharged through the exhaust pipe 6 to avoid the formation of air pockets and ensure the fullness of the grouting. After the grouting material solidifies, it forms a whole with the anchor rod body and the rock mass, plays an anchoring role, and achieves effective support for the slope.

[0033] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A combined hollow anchor device suitable for slope support, comprising an anchor body, wherein the anchor body is composed of a first anchor body (1) and a plurality of second anchor bodies (2) arranged in sequence along the length direction, characterized in that: The first anchor rod body (1) and the second anchor rod body (2) as well as the adjacent second anchor rod bodies (2) are connected and fixed via a connecting sleeve (3); the connecting sleeve (3) is a hollow structure and a side wall is provided with a through hole (31) for grouting material to overflow; the upper end of the first anchor rod body (1) is open and the end is provided with a joint sleeve (5) and an end sleeve barrel (4) in sequence from the inside to the outside; the end sleeve barrel (4) is covered on the outside of the joint sleeve (5) and a barrel wall of the end sleeve barrel (4) is provided with a plurality of through holes (41) along its circumference; The outer wall of the second anchor rod body (2) at the end of the anchor rod body is provided with a stop plug (7) of a tapered structure that is narrow in front and wide in the back. The end of the second anchor rod body (2) and located behind the stop plug (7) are provided with an end plate (8) and a pre-tightening nut (9) in sequence. The joint sleeve (5), the stop plug (7) and the end plate (8) are all provided with a plug hole, and an exhaust pipe (6) is passed through the plug hole. One end of the exhaust pipe (6) is located in a cavity formed by the joint sleeve (5) and the end sleeve barrel (4), and the other end passes through the plug holes on the joint sleeve (5), the stop plug (7) and the end plate (8) in sequence and extends out of the rock anchor hole.

2. The combined hollow anchor device suitable for slope support according to claim 1, characterized in that: The first anchor rod body (1) and the second anchor rod body (2) are threadedly connected via a connecting sleeve (3), and the connection is coated with epoxy resin adhesive.

3. The combined hollow anchor device suitable for slope support according to claim 1, characterized in that: The exhaust pipe (6) is made of silica gel and is used to discharge air and slurry bubbles in the pores of the rock mass.

4. The combined hollow anchor device suitable for slope support according to claim 1, characterized in that: The end sleeve barrel (4) and the joint sleeve (5) expand and deform due to friction during installation, thereby enhancing the fixing effect with the rock hole wall.

5. The combined hollow anchor device suitable for slope support according to claim 1, characterized in that: The first anchor rod body (1), the second anchor rod body (2) and the connecting sleeve (3) are all Q460 high-strength round steel pipes.

6. The combined hollow anchor device suitable for slope support according to claim 1, characterized in that: The distribution of the through hole (31) and the second through hole (41) ensures that the grouting material uniformly fills the pores of the rock mass.

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