A dangerous rock support anchoring device and construction method

Abstract

The present application relates to the field of water conservancy construction, and discloses a dangerous rock support anchoring device and construction method, which includes an anchor rod and a steel mesh, one end of the anchor rod penetrates into the rock mass and is fixedly connected to the solid rock mass, a plurality of anchor rods are arranged and distributed around the dangerous rock area, the steel mesh is laid on the dangerous rock, the other end of the anchor rod is located outside the rock mass and is fixedly connected to the steel mesh, a support assembly is arranged between the anchor rod located below the dangerous rock and the bottom of the dangerous rock, the support assembly includes a fixing plate and a supporting tube, one end of the anchor rod is located outside the rock mass and is threaded, the fixing plate thread ring is sleeved on the exposed end of the anchor rod, the fixing plate is close to the side wall of the rock mass and abuts against the rock mass, one end of the supporting tube is threadedly connected to the fixing plate, and the other end is provided with a receiving assembly for enhancing the supporting effect on the bottom of the dangerous rock, and the receiving assembly is fixedly connected to the bottom of the dangerous rock. The present application has the effect of improving the utilization rate of the anchor rod and the steel mesh, and enhancing the supporting force on the bottom of the dangerous rock.

Description

Technical Field

[0001] The present application relates to the field of water conservancy construction, and in particular to a dangerous rock support anchoring device and a construction method. Background Art

[0002] Although the dangerous rock mass has not collapsed yet, it has the main conditions for collapse and has already shown signs of collapse, which indicates that collapse may occur soon. Such rock mass is called a dangerous rock mass.

[0003] Dangerous rock is one of the typical geological disaster types in the Three Gorges Reservoir area. According to the instability type, dangerous rock is divided into three categories: falling dangerous rock, sliding dangerous rock and toppling dangerous rock. Their failure mechanisms are shear failure, compression shear failure and tension shear failure respectively. Some dangerous rocks can be demolished directly, while the other part needs to be supported when demolition conditions do not allow.

[0004] Related technologies: support, anchoring and filling are commonly used technologies for managing dangerous rocks, among which anchoring technology is the most frequently used. The loads acting on the dangerous rock mass mainly include deadweight, fissure water pressure and seismic force, among which fissure water pressure includes fissure water pressure under natural state and rainstorm conditions. According to the management goal of the stability coefficient of falling dangerous rock and dumping dangerous rock not less than 1.5, and the stability coefficient of sliding dangerous rock not less than 1.3, based on the limit equilibrium theory and following the failure mechanism of each type of dangerous rock, the anchoring calculation method for each type of dangerous rock is established. The position of the anchor rod and the steel mesh is determined through reasonable calculation and the bearing force of the anchor rod is reasonably distributed. The anchor rod is fixed to the solid rock mass and fixed with the steel mesh. The steel mesh is used to cover the dangerous rock to support the dangerous rock.

[0005] With respect to the above-mentioned related technologies, the inventor believes that there is a defect that the anchor rods and steel mesh cannot provide effective support to the bottom of the cantilevered dangerous rock. Summary of the invention

[0006] In order to improve the defect that anchor rods and steel mesh cannot provide effective support to the bottom of cantilevered dangerous rocks, the present application provides a dangerous rock support anchoring device and a construction method.

[0007] In the first aspect, the present application provides a dangerous rock support anchoring device adopts the following technical solution:

[0008] A dangerous rock support anchoring device comprises an anchor rod and a steel mesh, wherein one end of the anchor rod penetrates into the rock mass and is fixedly connected to the solid rock mass, a plurality of anchor rods are arranged and distributed around the dangerous rock area, the steel mesh is laid on the dangerous rock, the other end of the anchor rod is located outside the rock mass and is fixedly connected to the steel mesh, a support assembly is arranged between the anchor rod located below the dangerous rock and the bottom of the dangerous rock, the support assembly comprises a fixing plate and a supporting tube, a thread is provided at one end of the anchor rod located outside the rock mass, a threaded ring of the fixing plate is sleeved on the exposed end of the anchor rod, the fixing plate is close to the side wall of the rock mass and abuts against the rock mass, one end of the support tube is threadedly connected to the fixing plate, and the other end is provided with a receiving assembly for enhancing the supporting effect on the bottom of the dangerous rock, and the receiving assembly is fixedly connected to the bottom of the dangerous rock.

[0009] By adopting the above technical scheme, anchor rods are fixed around the dangerous rock area, and the steel mesh covers the entire dangerous rock area and is fixed to the anchor rods around the dangerous rock area, thereby supporting the dangerous rock. Since the dangerous rock is in a cantilevered state, there is a gap between the steel mesh at the bottom of the dangerous rock and the bottom of the dangerous rock, which cannot provide a good supporting effect on the bottom of the dangerous rock. The support pipe uses the force from the anchor rod under the dangerous rock to provide a good supporting effect on the bottom of the dangerous rock. The fixing plate strengthens the contact area between the support pipe and the anchor rod under the dangerous rock and the rock mass under the dangerous rock. The receiving assembly strengthens the contact area between the support pipe and the bottom of the dangerous rock, thereby improving the supporting effect on the bottom of the dangerous rock. The support assembly and the receiving assembly cooperate with the anchor rod and the steel mesh to enhance the supporting force on the bottom of the dangerous rock.

[0010] Optionally, a pointed cone is fixedly provided on one side of the fixing plate close to the rock mass, the pointed cone penetrates deep into the rock mass, a circular hole is opened on the fixing plate, the diameter of the circular hole is not less than the diameter of the anchor rod, and a casing is rotatably provided on the side of the fixing plate away from the rock mass, the center line of the casing is colinear with the center line of the circular hole, the casing rotates relative to the fixing plate with the center line as the rotation axis, and the exposed end of the anchor rod passes through the circular hole and is threadedly connected to the casing.

[0011] By adopting the above technical scheme, the pointed cone strengthens the connection effect between the fixing plate and the rock mass. When installing the fixing plate, the exposed end of the anchor rod is passed through the circular hole. At this time, the tip of the pointed cone abuts against the rock mass, and the fixing plate is pressed toward the rock mass, so that the pointed cone is initially inserted into the rock mass. At this time, the casing contacts the threaded end of the anchor rod, and then the casing is rotated. The casing continues to be threadedly connected with the end of the anchor rod and pushes the fixing plate toward the rock mass. The pointed cone is finally completely embedded in the rock mass. At this time, the fixing plate is fixed. The operation is simple and convenient and the fixing effect of the fixing plate is enhanced.

[0012] Optionally, the support tube includes multiple first connecting tubes and one second connecting tube, the multiple first connecting tubes are arranged in sequence and the second connecting tube is located in the middle, the multiple first connecting tubes and the second connecting tubes are threadedly connected in sequence, and a first bearing is arranged in the middle of the second connecting tube itself.

[0013] By adopting the above technical solution, multiple first connecting tubes and a single second connecting tube form a complete support tube. When the support tube is installed, the end of the support tube close to the fixed plate is threadedly connected to the fixed plate. Due to the setting of the first bearing in the second connecting tube, only the lower half of the support tube rotates at this time, and then the end of the support tube close to the receiving assembly is threadedly connected to the receiving assembly. At this time, only the upper half of the support tube rotates, and there is no need to rotate the support tube as a whole at the same time, which improves the convenience of installing the support tube.

[0014] Optionally, the side wall of the fixed plate facing away from the rock mass is hinged with a first butt joint tube, and the first butt joint tube is threadedly connected to one end of the support tube near the fixed plate; the receiving assembly includes a bearing plate and a second butt joint tube, the bearing plate is fixedly connected to the bottom of the dangerous rock, one end of the second butt joint tube is hinged to the side of the bearing plate facing away from the dangerous rock, and the second butt joint tube is threadedly connected to one end of the support tube near the bearing plate.

[0015] By adopting the above technical solution, the setting of the first butt joint tube and the second butt joint tube facilitates the threaded connection between the fixed plate, the load-bearing plate and the support tube. The hinged setting of the first butt joint tube and the fixed plate, as well as the hinged setting of the second butt joint tube and the load-bearing plate facilitate adapting to the inclination angle of the support tube, thereby improving the convenience when connecting with the support tube.

[0016] Optionally, the interior of the bearing plate is hollow, a plurality of slurry outlet holes are opened on the side wall of the bearing plate close to the dangerous rock, a grouting hole is opened on the bearing plate, the grouting hole and the slurry outlet holes are located on two adjacent side walls of the bearing plate, and a sealing plug is provided on the bearing plate for sealing the grouting hole.

[0017] By adopting the above technical solution, after the bearing plate abuts against the bottom of the dangerous rock, the steel mesh can be between the bearing plate and the dangerous rock, or the bearing plate can directly abut against the bottom of the dangerous rock. By injecting concrete into the grouting holes, the concrete fills the entire bearing plate, thereby enhancing the firmness of the entire bearing plate. After the bearing plate is filled with concrete, the concrete overflows through the grouting holes. At this time, there is concrete between the bearing plate and the bottom of the dangerous rock. After the concrete solidifies, the fixing effect of the bearing plate and the bottom of the dangerous rock is enhanced.

[0018] Optionally, a convex strip is fixedly provided on the bearing plate, the convex strip is located on the side wall where the bearing plate abuts against the dangerous rock, the convex strip is adapted to the shape of the bearing plate, and the convex strip is arranged around the edge of the side wall of the bearing plate.

[0019] By adopting the above technical solution, the provision of the convex strips strengthens the remaining amount of concrete between the bearing plate and the bottom of the dangerous rock, thereby improving the fixing effect of the bearing plate and the bottom of the dangerous rock.

[0020] Optionally, a fixing groove is provided at the bottom of the dangerous rock, and the fixing groove is opened along the direction away from the solid rock mass along the cantilevered bottom of the dangerous rock. The bearing plate is horizontally arranged, and the two ends of the bearing plate in the length direction of the vertical fixing groove are inclined downward. The fixing groove is adapted to the shape of the bearing plate, and the hinge direction of the second butt joint tube and the bearing plate is adapted to the hinge direction of the fixing plate and the first butt joint tube.

[0021] By adopting the above technical solution, the setting of the bearing plate shape and the matching fixing groove, the contact area between the bearing plate and the bottom of the dangerous rock is strengthened, and the fixing and limiting effect between them is enhanced.

[0022] Optionally, a reinforcing rod is fixedly provided at the bottom of the bearing plate, one end of the reinforcing rod is fixedly connected to one inclined end of the bearing plate, and the other end of the reinforcing rod is fixedly connected to the other inclined end of the bearing plate.

[0023] By adopting the above technical solution, the setting of the reinforcing rod is coordinated with the shape of the bearing plate, so that the whole is in a triangular shape. The triangle is a stable supporting structure, that is, the reinforcing rod strengthens the supporting and bearing capacity of the bearing plate.

[0024] Optionally, the pulp outlet hole is located between adjacent inclined ends of the supporting plate and is located close to the midpoint of the line connecting the adjacent inclined ends.

[0025] By adopting the above technical solution and setting the position of the slurry outlet hole, the slurry on the top of the bearing plate flows from the middle to the end. When the slurry overflows from the end, the workers stop grouting. The slurry outlet hole is opened in the middle to store as much concrete slurry as possible on the top of the bearing plate.

[0026] In a second aspect, the present application provides a dangerous rock support anchoring device and a construction method, comprising the following steps:

[0027] S1: Line survey to determine dangerous rock areas and solid rock areas;

[0028] S2: Drill a hole in the rock mass, clean the hole, insert an anchor and pour concrete;

[0029] S3: Laying steel mesh to cover the dangerous rock;

[0030] S4: Install the support assembly and the receiving assembly between the end of the anchor rod below the dangerous rock and the bottom of the dangerous rock;

[0031] S5: Pour concrete into the receiving component and spray concrete on the surface of the steel mesh.

[0032] By adopting the above technical scheme, the anchor rods are first fixed and the supporting components and the receiving components are installed, so that the supporting components and the receiving components can support the bottom of the dangerous rock and cooperate with the anchor rods under the dangerous rock to form a fixation, thereby improving the utilization rate of the anchor rods under the dangerous rock. At the same time, the steel mesh under the dangerous rock can be more closely attached to the dangerous rock, thereby improving the covering and supporting effect of the steel mesh under the dangerous rock on the dangerous rock.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] 1. The support pipe uses the force from the anchor rod below the dangerous rock to provide good support to the bottom of the dangerous rock. The fixing plate strengthens the contact area between the support pipe and the anchor rod below the dangerous rock and the rock mass below the dangerous rock. The receiving assembly strengthens the contact area between the support pipe and the bottom of the dangerous rock, improving the support effect on the bottom of the dangerous rock. The support assembly and the receiving assembly cooperate with the anchor rod and the steel mesh to enhance the support force on the bottom of the dangerous rock.

[0035] 2. By injecting concrete into the grouting holes, the concrete fills the entire bearing plate, thereby strengthening the firmness of the entire bearing plate. After the bearing plate is filled with concrete, the concrete overflows through the grouting holes. At this time, there is concrete between the bearing plate and the bottom of the dangerous rock. After the concrete solidifies, the fixing effect of the bearing plate and the bottom of the dangerous rock is strengthened;

[0036] 3. The reinforcing rod cooperates with the shape of the bearing plate to form a stable triangular state, which enhances the bearing capacity of the bearing plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0038] Figure 2 It is a schematic diagram of the structure of the supporting components and the receiving components;

[0039] Figure 3 It is a schematic diagram of the structure of the support components that are highlighted after the dangerous rock is hidden;

[0040] Figure 4 It is a schematic diagram of the partial structure of the bearing plate that is highlighted after the dangerous rock is hidden.

[0041] Explanation of the reference numerals: 1. Anchor rod; 2. Steel mesh; 3. Support assembly; 31. Fixing plate; 311. Cone; 312. Round hole; 313. Sleeve; 314. First butt joint; 315. Second bearing; 32. Support tube; 321. First connecting tube; 322. Second connecting tube; 3221. First bearing; 4. Support assembly; 41. Load-bearing plate; 411. Grouting hole; 412. Grouting hole; 413. Raised strip; 42. Second butt joint; 5. Fixing groove; 6. Reinforcement rod; 7. Dangerous rock. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-4 This application is described in further detail.

[0043] The embodiment of the present application discloses a dangerous rock support anchoring device.

[0044] Reference Figure 1 A dangerous rock support anchoring device includes an anchor rod 1 and a steel mesh 2. The anchor rod 1 is fixedly connected to the rock mass. There are multiple anchor rods 1, and adjacent anchor rods 1 are distributed around the dangerous rock 7 area. One end of the anchor rod 1 penetrates into the rock mass, and the other end is located outside the rock mass. The end of the anchor rod 1 penetrates into the rock mass and reaches the solid rock mass. The steel mesh 2 is laid on the rock mass to completely cover the dangerous rock 7 area. The exposed end of the anchor rod 1 and the steel mesh 2 can be fixed by steel wire binding, or a gasket can be fixed at the exposed end of the steel bar to press the steel mesh 2 and the rock mass tightly, and concrete is sprayed on the outside of the steel mesh 2 to complete the final fixation. A support component 3 is provided at the bottom of the dangerous rock 7, and the support component 3 is fixedly connected to the exposed end of the anchor rod 1 at the bottom of the dangerous rock 7, and a receiving component 4 is provided between the other end and the bottom of the dangerous rock 7. One side of the receiving component 4 is fixedly connected to the support component 3, and the other side abuts against the bottom of the dangerous rock 7 and simultaneously clamps the steel mesh 2 at the bottom of the dangerous rock 7 between the receiving component 4 and the bottom of the dangerous rock 7, thereby supporting the bottom of the dangerous rock 7, so as to achieve the effect of the receiving component 4 and the support component 3 cooperating with the anchor rod 1 and the steel mesh 2 to enhance the supporting force on the bottom of the dangerous rock 7.

[0045] Reference Figure 2 and Figure 3, the anchor rod 1 is provided with a thread at one end outside the rock mass. The support assembly 3 includes a fixing plate 31 and a support tube 32. The fixing plate 31 is in the shape of a rectangular plate, and a circular hole 312 is provided at the center of the fixing plate 31. The diameter of the circular hole 312 is larger than the diameter of the anchor rod 1, so that the exposed end of the anchor rod 1 can pass through the fixing plate 31. A second bearing 315 is fixedly provided on the inner wall of the circular hole 312, and the exposed end of the anchor rod 1 can pass through the second bearing 315. A sleeve 313 is fixedly connected to the second bearing 315, and the length direction of the sleeve 313 is arranged in a direction away from the fixing plate 31. The center line of the sleeve 313 is colinear with the center line of the circular hole 312, and a thread is provided inside the sleeve 313. After the exposed end of the anchor rod 1 passes through the circular hole 312 and the second bearing 315, it is threadedly connected to the sleeve 313. A pointed cone 311 is fixedly provided on one side of the fixing plate 31 close to the rock mass. There are four pointed cones 311, which are located at the four corners of the fixing plate 31, and the tips of the pointed cones 311 are arranged facing the rock mass. After the anchor rod 1 below the dangerous rock 7 is fixed, one side of the pointed cone 311 of the fixing plate 31 is aligned with the rock mass, so that the exposed end of the anchor rod 1 passes through the circular hole 312 and the second bearing 315. At this time, the pointed cone 311 abuts against the rock mass, and an external force is applied in the direction of the rock mass, so that the pointed cone 311 is initially inserted into the rock mass. At this time, the sleeve 313 and the exposed end of the anchor rod 1 can be threadedly connected, and then the sleeve 313 is rotated. While the sleeve 313 and the anchor rod 1 are screwed, the fixing plate 31 is forced to move toward the direction close to the rock mass. Finally, the pointed cone 311 is completely inserted into the rock mass, and the side wall of the fixing plate 31 close to the rock mass abuts against the rock mass, completing the fixing of the fixing plate 31. The operation is simple and convenient.

[0046] Reference Figure 2 and Figure 3 A first butt-jointed pipe 314 is provided on the fixing plate 31 , one end of the first butt-jointed pipe 314 is hinged to the side wall of the fixing plate 31 away from the rock mass, and the other end is threadedly connected to one end of the supporting pipe 32 .

[0047] The support tube 32 includes a first connecting tube 321 and a second connecting tube 322. There are multiple first connecting tubes 321 and one second connecting tube 322. The first connecting tube 321 and the second connecting tube 322 are both threadedly connected at the head and tail to form a complete support tube 32. The center lines of the first connecting tube 321 and the second connecting tube 322 are colinear, wherein the second connecting tube 322 is located at the middle position of the support tube 32. The second connecting tube 322 itself is provided with a first bearing 3221, and the first bearing 3221 divides the second connecting tube 322 itself into two parts. Due to the setting of the first bearing 3221, the upper half and the lower half of the support tube 32 can be rotated separately with the first bearing 3221 as the dividing line, which provides convenience for one end of the support tube 32 to be threadedly connected to the first butt tube 314 and the other end to be threadedly connected to the receiving assembly 4.

[0048] Reference Figure 2 and Figure 4The receiving assembly 4 includes a bearing plate 41 and a second butt joint pipe 42. A fixing groove 5 is provided at the bottom of the dangerous rock 7, and the fixing groove 5 is provided along the bottom of the dangerous rock 7 in a direction away from the rock mass. The bearing plate 41 is arranged horizontally, and the two ends of the bearing plate 41 perpendicular to the length direction of the fixing groove 5 are arranged obliquely downward, that is, the middle part of the bearing plate 41 protrudes upward. A reinforcing rod 6 is provided at the bottom of the bearing plate 41, and two reinforcing rods 6 are provided. Adjacent reinforcing rods 6 are located at the two ends of the bottom of the bearing plate 41 along the length direction of the fixing groove 5, that is, the vertical projections of the bearing plate 41 and the reinforcing rod 6 along the length direction of the fixing groove 5 are triangles, so the cooperation of the bearing plate 41 and the reinforcing rod 6 presents a stable shape. The second butt joint pipe 42 is located at the bottom of the bearing plate 41, and one end of the second butt joint pipe 42 is hinged to the deepest depression at the bottom of the bearing plate 41, and the other end is threadedly connected to the end of the support tube 32 away from the fixing plate 31.

[0049] Reference Figure 2 and Figure 3 The hinge direction of the second butt joint tube 42 and the bearing plate 41 is adapted to the hinge direction of the first butt joint tube 314 and the fixing plate 31, that is, when adjusting the overall inclination angle of the support tube 32 relative to the rock mass, the second butt joint tube 42 and the first butt joint tube 314 can adapt to the adjustment of the inclination angle of the support tube 32.

[0050] Replay Figure 2 and Figure 4The interior of the bearing plate 41 is hollow, and a grouting hole 411 is provided at one end of the bearing plate 41 along the length direction of the fixing groove 5. The grouting hole 411 is located at the protrusion of the side wall where the bearing plate 41 is located. A plurality of grouting holes 412 are provided on the bearing plate 41. The grouting holes 412 are located on the side wall of the bearing plate 41 near the bottom of the dangerous rock 7. The grouting holes 412 are all located near the top of the protrusion of the bearing plate 41, and adjacent grouting holes 412 are equidistantly provided along the length direction of the fixing groove 5. The fixing groove 5 is adapted to the shape of the bearing plate 41 and the grouting holes 411 are exposed to complete the subsequent grouting process. A convex strip 413 is fixedly provided on the bearing plate 41. The convex strip 413 is located on the side wall of the bearing plate 41 near the bottom of the dangerous rock 7. The convex strip 413 is fixedly provided along the edge of the side wall of the bearing plate 41. When the second butt joint 42 is threadedly connected to the end of the support rod away from the fixing plate 31, the bearing plate 41 also abuts against the bottom of the dangerous rock 7. The bearing plate 41 can abut the steel mesh 2 located at the bottom of the dangerous rock 7 against the bottom of the dangerous rock 7 at the same time. At this time, the steel mesh 2 is bent at the position of the convex strip 413, and the convex strip 413 is no longer tightly abutted against the bottom of the dangerous rock 7. This part does not affect the overall support of the bottom of the dangerous rock 7 and the subsequent grouting process. After the receiving component 4 is fixed, concrete is injected into the grouting hole 411. The concrete entering the bearing plate 41 conforms to the shape of the bearing plate 41, flows to the inclined ends, and finally fills to the protrusion in the middle of the bearing plate 41, overflows through the slurry outlet hole 412, and overflows into the space circled by the convex strip 413, solidifying the part of the steel mesh 2 located between the bearing plate 41 and the bottom of the dangerous rock 7 and the bearing plate 41 into a whole, and at the same time, the fixing effect of the bearing plate 41 and the bottom of the dangerous rock 7 is strengthened by the concrete.

[0051] Replay Figure 1 and Figure 2 The fixing plate 31 utilizes the anchor rod 1 under the dangerous rock 7 for fixing, thereby improving the utilization rate of the anchor rod 1. The supporting component 3 cooperates with the receiving component 4 to form a stable triangular support with the rock mass, which has a stable supporting effect on the bottom of the dangerous rock 7. The setting of the receiving component 4 itself and the setting of the reinforcing rod 6 once again form a stable triangular support state, thereby enhancing the bearing capacity of the receiving component 4. The number of the supporting components 3, the receiving component 4 and the corresponding fixing grooves 5 are arranged and opened after selecting a reasonable number through calculation.

[0052] The implementation principle of a dangerous rock support anchoring device in an embodiment of the present application is as follows: after fixing the anchor rod 1, laying the steel mesh 2, and fixing the fixing plate 31 on the anchor rod 1 below the dangerous rock 7, then threading the support tube 32, and adjusting the angle of the support tube 32, opening a fixing groove 5 at a suitable position below the dangerous rock 7, placing the support assembly 3 together with the steel mesh 2 at the bottom of the dangerous rock 7 in the fixing groove 5 and threading them together with the support tube 32, thereby completing the support and fixation below the dangerous rock 7, achieving the effect of improving the utilization rate of the anchor rod 1, and the receiving assembly 4 and the support assembly 3 cooperate with the anchor rod 1 and the steel mesh 2 to enhance the supporting force on the bottom of the dangerous rock 7.

[0053] The embodiments of the present application also disclose a dangerous rock support anchoring device and a construction method.

[0054] S1: Line survey to determine the dangerous rock 7 area and solid rock area;

[0055] S2: Drill a hole in the rock mass, clean the hole, put in the anchor rod 1 and pour concrete, maintain the concrete strength, and proceed to the next process after the anchor rod 1 is finally fixed;

[0056] S3: Laying the steel mesh 2, the steel mesh 2 covers the dangerous rock 7, and tying the steel mesh 2 near the anchor rod 1 to the anchor rod 1 with steel wire;

[0057] S4: Determine the support position of the support assembly 3 according to calculation, open a fixing groove 5 below the dangerous rock 7, and install the support assembly 3 and the receiving assembly 4 between the end of the anchor rod 1 below the dangerous rock 7 and the bottom of the dangerous rock 7;

[0058] S5: Pour concrete into the receiving component 4. When concrete slurry overflows, continue pouring for half a minute, then stop pouring and seal the grouting hole 411 with a sealing plug.

[0059] S6: Spray concrete on the surface of the steel mesh 2.

[0060] The implementation principle of a dangerous rock support anchoring device and a construction method in an embodiment of the present application is as follows: through the preliminary support of the anchor rod 1 and the steel mesh 2, a reasonable fixed position is opened on the dangerous rock 7, and the effect of strengthening the bottom support capacity of the dangerous rock 7 is achieved through the support component 3 and the receiving component 4, and the utilization rate of the anchor rod 1 below the dangerous rock 7 is improved, and at the same time, the steel mesh 2 at the bottom of the dangerous rock 7 is fully utilized, ultimately achieving the effect of improving the utilization rate of the anchor rod 1 and the steel mesh 2 and enhancing the support force on the bottom of the dangerous rock 7.

[0061] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dangerous rock support anchoring device, comprising an anchor rod (1) and a steel mesh (2), wherein one end of the anchor rod (1) penetrates into the rock mass and is fixedly connected to the solid rock mass, a plurality of anchor rods (1) are arranged around the dangerous rock (7), the steel mesh (2) is laid on the dangerous rock (7), and the other end of the anchor rod (1) is located outside the rock mass and is fixedly connected to the steel mesh (2), characterized in that: A support assembly (3) is arranged between the anchor rod (1) located below the dangerous rock (7) and the bottom of the dangerous rock (7), and the support assembly (3) comprises a fixing plate (31) and a support pipe (32). The anchor rod (1) is provided with a thread at one end located outside the rock mass, and the fixing plate (31) is threadedly sleeved on the exposed end of the anchor rod (1). The fixing plate (31) is in contact with the rock mass near the side wall of the rock mass, and one end of the support pipe (32) is threadedly connected to the fixing plate (31), and the other end is provided with a receiving assembly (4) for enhancing the supporting effect on the bottom of the dangerous rock (7), and the receiving assembly (4) is fixedly connected to the bottom of the dangerous rock (7); the side wall of the fixing plate (31) facing away from the rock mass is hinged with a first butt joint pipe (314), and the first butt joint pipe (314) and the support pipe (32) are close to the fixing plate. (31) is threadedly connected at one end; the receiving assembly (4) comprises a bearing plate (41) and a second butt joint pipe (42); the bearing plate (41) is fixedly connected to the bottom of the dangerous rock (7); one end of the second butt joint pipe (42) is hinged to the side of the bearing plate (41) away from the dangerous rock (7); the second butt joint pipe (42) is threadedly connected to one end of the support pipe (32) close to the bearing plate (41); the bearing plate (41) is hollow inside; a plurality of grouting holes (412) are provided on the side wall of the bearing plate (41) close to the dangerous rock (7); a grouting hole (411) is provided on the bearing plate (41); the grouting hole (411) and the grouting hole (412) are located on two adjacent side walls of the bearing plate (41); and a sealing plug for sealing the grouting hole (411) is provided on the bearing plate (41).

2. A dangerous rock support anchoring device according to claim 1, characterized in that: A pointed cone (311) is fixedly arranged on the side of the fixing plate (31) close to the rock mass, and the pointed cone (311) penetrates into the rock mass. A circular hole (312) is opened on the fixing plate (31), and the diameter of the circular hole (312) is not less than the diameter of the anchor rod (1). A sleeve (313) is rotatably arranged on the side of the fixing plate (31) away from the rock mass, and the center line of the sleeve (313) is colinear with the center line of the circular hole (312). The sleeve (313) rotates relative to the fixing plate (31) with the center line as the rotation axis, and the exposed end of the anchor rod (1) passes through the circular hole (312) and is threadedly connected to the sleeve (313).

3. A dangerous rock support anchoring device according to claim 2, characterized in that: The support tube (32) comprises a plurality of first connecting tubes (321) and a second connecting tube (322), the plurality of first connecting tubes (321) are arranged in sequence and the second connecting tube (322) is located in the middle, the plurality of first connecting tubes (321) and the second connecting tube (322) are threadedly connected end to end in sequence, and a first bearing (3221) is arranged in the middle of the second connecting tube (322).

4. A dangerous rock support anchoring device according to claim 2, characterized in that: The bearing plate (41) is fixedly provided with a convex strip (413), the convex strip (413) is located on the side wall of the bearing plate (41) abutting against the dangerous rock (7), the convex strip (413) is adapted to the shape of the bearing plate (41), and the convex strip (413) is arranged around the edge of the side wall of the bearing plate (41).

5. A dangerous rock support anchoring device according to claim 4, characterized in that: A fixing groove (5) is provided at the bottom of the dangerous rock (7), and the fixing groove (5) is provided in a direction away from the solid rock mass in conformity with the cantilevered bottom of the dangerous rock (7). The bearing plate (41) is arranged horizontally, and the two ends of the bearing plate (41) are arranged vertically in a length direction of the fixing groove (5) and tilted downward. The fixing groove (5) is adapted to the shape of the bearing plate (41), and the hinge direction of the second butt joint pipe (42) and the bearing plate (41) is adapted to the hinge direction of the fixing plate (31) and the first butt joint pipe (314).

6. A dangerous rock support anchoring device according to claim 5, characterized in that: A reinforcing rod (6) is fixedly arranged at the bottom of the bearing plate (41), one end of the reinforcing rod (6) is fixedly connected to one inclined end of the bearing plate (41), and the other end of the reinforcing rod (6) is fixedly connected to the other inclined end of the bearing plate (41).

7. A dangerous rock support anchoring device according to claim 5, characterized in that: The pulp outlet hole (412) is located between adjacent inclined ends of the supporting plate (41) and is located close to the midpoint of the line connecting the adjacent inclined ends.

8. A construction method for the dangerous rock support anchoring device according to claim 1, comprising the following steps: S1: Line survey to determine dangerous rock (7) areas and solid rock areas; S2: Drill a hole in the rock mass, clean the hole, insert an anchor rod (1) and pour concrete; S3: Laying a steel mesh (2), the steel mesh (2) covers the dangerous rock (7); S4: installing a support assembly (3) and a receiving assembly (4) between the end of the anchor rod (1) below the dangerous rock (7) and the bottom of the dangerous rock (7); S5: pouring concrete into the receiving component (4) and spraying concrete on the surface of the steel mesh (2).

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