Grouting anchor rod suitable for layered fractured rock mass and construction method

Abstract

The grouting anchor rod suitable for the layered broken rock mass comprises an anchoring rod body formed by coaxially and spirally splicing a plurality of sections with different lengths, the anchoring rod body is provided with a grouting channel communicating from the interior to the peripheral portion, and the peripheral portion of the anchoring rod body is further provided with a telescopic anchor fluke assembly. According to the grouting anchor rod suitable for the layered fractured rock mass, the anchor rod is assembled according to the occurrence condition of the stratum from the structure of the actual stratum, anchor rod construction is highly matched with the actual rock mass, and the grouting anchor rod has the advantages of being flexible in structure, convenient and fast to assemble, excellent in anchoring effect and the like. In addition, grouting reinforcement can be conducted according to construction requirements, the adaptability of anchor rod construction to the complex geological environment is perfectly improved, and the construction safety and the construction structure stability are further guaranteed.

Description

Technical Field

[0001] The invention relates to a grouting anchor rod suitable for layered and broken rock mass and a construction method thereof, and relates to the technical field of support and reinforcement of layered and broken rock mass. Background Art

[0002] Anchor rods are a basic component of underground engineering and slope support systems. Their main function is to reinforce the surrounding rock of tunnels or other underground spaces and use the strength of the surrounding rock to achieve support. Due to the influence of geological tectonic action, there are natural joints, faults and weak interlayers in the rock mass, which seriously affect the stability of the rock mass and become a difficult problem to be solved in the design and construction of the project. Traditional anchor rod structure fixation is not suitable for soft, broken and layered rock mass in geology, and its applicability and stability are poor.

[0003] Based on this, in order to solve the above technical problems, this case proposes a grouting anchor rod and construction method suitable for layered broken rock mass. Summary of the invention

[0004] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a grouting anchor rod and a construction method suitable for layered broken rock mass.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a grouting anchor rod suitable for layered broken rock mass, comprising an anchor rod body formed by coaxially spirally splicing a number of segments of different lengths, the anchor rod body being provided with a grouting channel connected from the inside to the periphery, and the periphery of the anchor rod body being also provided with a telescopic anchor claw assembly.

[0006] Preferably, the interior of the anchor rod body is hollow, the front end thereof is a closed end, and the rear end thereof is an open end.

[0007] Preferably, the telescopic fluke assembly comprises at least two groups of umbrella-shaped opening and closing brackets, and the opening and closing brackets are distributed at intervals along the axial direction of the anchor rod body; and the opening and closing brackets are all installed on a single opening and closing bracket segment.

[0008] Preferably, the opening and closing brackets include a plurality of rocker arms evenly distributed on the outer periphery of the anchor rod body, and the outer periphery of the anchor rod body is provided with an installation gap for installing each rocker arm. The installation gap is connected to the interior of the anchor rod body and serves as a part of the grouting channel.

[0009] Preferably, the front end of the rocker arm is hinged at the front end of the installation gap, the non-end portion of the rocker arm is hinged with a connecting rod, the other end of the connecting rod is hinged with a push rod, the push rod is located inside the anchor rod body and parallel to the axial direction of the anchor rod body, and in all opening and closing brackets, the connecting rods of the front and rear rocker arms with the same circumferential position share the same push rod.

[0010] Preferably, the push rod is a telescopic rod.

[0011] Preferably, the rear ends of the push rods extend to the middle and rear part of the anchor rod body and are connected to telescopic springs, the axial directions of the telescopic springs are parallel to the axial directions of the anchor rod body, the front ends of the telescopic springs are fixed on the anchor rod body, the rear ends of the push rods pass through the interior of the telescopic springs to the rear ends of the telescopic springs and are fixed to the rear ends of the telescopic springs, and an L-shaped clamping rod is also fixed to the rear ends of the push rods and is located on the rear side of the telescopic springs.

[0012] Preferably, a hollow screw is provided on the rear end opening of the anchor rod body, and the part of the screw located outside the anchor rod body is threadedly connected with a nut which is abutted against the rear end surface of the anchor rod body, and the end of the screw located inside the anchor rod body is evenly distributed along the circumference with a plurality of convex teeth for pulling against the corresponding elbow of the clamping rod, and the gap between adjacent convex teeth is the disengagement gap of the elbow of the clamping rod.

[0013] Preferably, a tray sleeved on the outer periphery of the screw is provided between the nut and the rear end surface of the anchor rod body, a grouting pipe is inserted into the hollow interior of the screw rod, and the grouting pipe extends forward to form a grouting channel together with the hollow interior of the anchor rod body and the installation gap.

[0014] A construction method for grouting anchor rods suitable for layered broken rock mass comprises the following steps: S1: Assemble the anchor rod: Assemble the anchor rod according to the rock mass conditions as shown in the figure, so that the arrangement of the umbrella-shaped opening and closing bracket corresponds to the broken rock mass position. At this time, the turning head of the clamping rod and the corresponding convex teeth at the front end of the screw rod are mutually pulled and hooked, the telescopic spring is in a stretched state, and the swing rod of the opening and closing bracket is retracted into the corresponding installation gap; S2: Anchor installation: After the assembled anchor is placed in the rock mass to be reinforced, the screw is rotated so that the turning head of the clamping rod is separated from the corresponding convex teeth at the front end of the screw rod at the moment of the disengagement gap, the tension of the telescopic spring is released and the elastic energy is released, the rear end of the telescopic spring moves forward with the push rod, the push rod drives the umbrella-shaped opening and closing bracket to open through the connecting rod, and the swing rod swings outward to clamp the rock mass; S3: Grouting: insert the grouting pipe along the middle of the screw rod, and inject grout into the grouting channel. The grouting liquid is injected into the broken rock mass through the inside of the anchor rod body and the installation gap along the grouting pipe in sequence, until the grouting liquid fills the entire space to be filled and overflows from the grouting port. After a certain period of time, the grouting liquid solidifies and the anchor rod and the rock mass to be reinforced form an anchored integrated structure. S4: Prestressing: The nut is rotated to apply prestressing force, which further enhances the anchoring effect.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the grouting anchor rod suitable for layered broken rock mass is assembled according to the occurrence conditions of the stratum and the structure of the actual stratum, so that the anchor rod construction is highly consistent with the actual rock mass, and has the advantages of flexible structure, convenient assembly, and excellent anchoring effect. In addition, the present invention can perform grouting reinforcement according to construction requirements, perfectly improving the adaptability of anchor rod construction to complex geological environments, and further ensuring the safety of construction and the stability of the construction structure.

[0016] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the open and close bracket according to an embodiment of the present invention.

[0018] Figure 2 for Figure 1 A is a partial enlarged view of the .

[0019] Figure 3 for Figure 2 Side view of the middle turn head and convex teeth separated.

[0020] Figure 4 It is a schematic diagram of the structure of the opening and closing bracket closed according to an embodiment of the present invention.

[0021] Figure 5 for Figure 4 B is a partial enlarged view of .

[0022] Figure 6 for Figure 5 Side view of the middle turn head and the convex teeth being connected by pulling.

[0023] Figure 7 Side view with the closure bracket open.

[0024] Figure 8 This is a partial view of the push rod.

[0025] Fig. 9 Schematic diagram of the working state of an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] like Figures 1 to 9 As shown, this embodiment provides a grouting anchor suitable for layered broken rock mass, including an anchor rod body 1 formed by coaxially spirally splicing a number of segments of different lengths, the anchor rod body is provided with a grouting channel connecting from the inside to the periphery, and the periphery of the anchor rod body is also provided with a telescopic anchor claw assembly.

[0030] In the embodiment of the present invention, the interior of the anchor rod body is hollow, the front end thereof is a closed end, and the rear end thereof is an open end.

[0031] In the embodiment of the present invention, the segments are divided into a front segment 101, an opening and closing bracket segment 102, an intermediate segment 103, and a rear segment 104. Adjacent segments are screwed together by internal and external threads. The intermediate segment has multiple threads for selection to adjust the length. The intermediate segment can be installed between the front segment and the opening and closing bracket segment, or between two opening and closing bracket segments, or between the opening and closing bracket segment and the rear segment, or between the intermediate segments. The front end of the front segment is a closed end, and the rear end of the rear segment is an open end.

[0032] In the embodiment of the present invention, there are multiple foldable stent segments for selection.

[0033] In the embodiment of the present invention, the telescopic fluke assembly comprises at least two groups of umbrella-shaped opening and closing brackets 2, and the opening and closing brackets are distributed at intervals along the axial direction of the anchor rod body; the opening and closing brackets are all installed on a single opening and closing bracket segment.

[0034] In an embodiment of the present invention, the opening and closing bracket includes a plurality of rocker arms 3 evenly distributed on the outer periphery of the anchor rod body, and the outer periphery of the opening and closing bracket segment of the anchor rod body is provided with an installation gap 4 for installing each rocker arm. The installation gap is connected to the interior of the anchor rod body and serves as a part of the grouting channel.

[0035] In the embodiment of the present invention, the front end of the rocker arm is hinged at the front end of the installation gap, the non-end of the rocker arm is hinged with a connecting rod 5, the other end of the connecting rod is hinged with a push rod 6, the push rod is located inside the anchor rod body and parallel to the axial direction of the anchor rod body, and in all opening and closing brackets, the connecting rods of the front and rear rocker arms with the same circumferential position share the same push rod.

[0036] In the embodiment of the present invention, the push rods are all telescopic rods, and the rod sections 7 of the telescopic rods are locked and fixed by set screws 8 .

[0037] In the embodiment of the present invention, the rear end of the push rod extends to the rear end segment of the middle and rear part of the anchor rod body and is connected to a telescopic spring 9, the axial direction of the telescopic spring is parallel to the axial direction of the anchor rod body, the front end of the telescopic spring is fixed on the anchor rod body, the rear end of the push rod is passed through the interior of the telescopic spring to the rear end of the telescopic spring and is fixed to the rear end of the telescopic spring, and an L-shaped clamping rod 10 is also fixed to the rear end of the push rod and is located on the rear side of the telescopic spring.

[0038] In the embodiment of the present invention, a hollow screw 11 is provided on the rear end opening of the rear end segment of the anchor rod body, and the part of the screw located outside the anchor rod body is threadedly connected with a nut 12 which is abutted against the rear end surface of the anchor rod body, and the end of the screw located inside the anchor rod body is evenly distributed along the circumference with a plurality of convex teeth 14 for pulling against the corresponding elbow 13 of the clamping rod, and the gap between adjacent convex teeth is the disengagement gap 15 of the elbow of the clamping rod.

[0039] In an embodiment of the present invention, a tray 16 is provided between the nut and the rear end face of the anchor rod body and is sleeved on the outer periphery of the screw rod. A grouting pipe 17 is inserted into the hollow interior of the screw rod. The grouting pipe extends forward and together with the hollow interior of the anchor rod body and the installation gap, forms a grouting channel.

[0040] In the embodiment of the present invention, the swing rod gradually becomes sharper from the front end to the rear end.

[0041] A construction method for grouting anchor rods suitable for layered broken rock mass comprises the following steps: S1: Assemble the anchor rod: Assemble the anchor rod according to the rock mass conditions as shown in the figure, so that the arrangement of the umbrella-shaped opening and closing bracket corresponds to the broken rock mass position. At this time, the turning head of the clamping rod and the corresponding convex teeth at the front end of the screw rod are mutually pulled and hooked, the telescopic spring is in a stretched state, and the swing rod of the opening and closing bracket is retracted into the corresponding installation gap; S2: Anchor rod installation: After the assembled anchor rod is placed in the rock mass to be reinforced, the screw rod is rotated so that the turning head of the clamping rod is separated from the corresponding convex teeth at the front end of the screw rod at the moment of the disengagement gap, the tension of the telescopic spring is released and the elastic energy is released, the rear end of the telescopic spring moves forward with the push rod, the push rod drives the umbrella-shaped opening and closing bracket to open through the connecting rod, and the swing rod swings outward to clamp the broken rock mass 18; S3: Grouting: insert the grouting pipe along the middle of the screw rod, and inject grout into the grouting channel. The grouting liquid is injected into the broken rock mass through the inside of the anchor rod body and the installation gap along the grouting pipe in sequence, until the grouting liquid fills the entire space to be filled and overflows from the grouting port. After a certain period of time, the grouting liquid solidifies and the anchor rod and the rock mass to be reinforced form an anchored integrated structure. S4: Prestressing: The nut is rotated to apply prestressing force, which further enhances the anchoring effect.

[0042] In an embodiment of the present invention, the grouting anchor rod suitable for layered crushed rock mass is assembled according to the structure of the actual stratum and the occurrence conditions of the stratum, wherein anchor rods of different lengths are assembled through segments of different lengths, and the axial position and number of the opening and closing bracket segments in the anchor rod can be adjusted according to the position and number of rock crushing. When the anchor rod length and the opening and closing bracket position are determined, the length of the retractable push rod is adjusted to make the push rod length match the control between the opening and closing bracket and the telescopic spring and the screw convex teeth. After the push rod length is determined, the push rod length is fixed by tightening the set screws on each rod section, and then the push rod is installed.

[0043] In the embodiment of the present invention, in order to facilitate the hinge connection between the push rod and the connecting rod, a plurality of hinge supports 19 are mounted on the push rod. The hinge supports are used to hinge the connecting rod. A set screw is provided between the hinge support and the push rod. The position of the hinge support can be adjusted by loosening the set screw.

[0044] The anchor construction can achieve a high degree of fit with the actual rock mass crushing position, and has the advantages of flexible structure, convenient assembly, excellent anchoring effect, etc. In addition, the present invention can be reinforced by grouting according to construction requirements, which perfectly improves the adaptability of anchor construction to complex geological environments, and further ensures the safety of construction and the stability of the construction structure.

[0045] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A grouting anchor suitable for layered broken rock mass, characterized by: The invention comprises an anchor rod body formed by coaxially spirally splicing a plurality of segments of different lengths. The anchor rod body is provided with a grouting channel connected from the inside to the periphery. The periphery of the anchor rod body is also provided with a telescopic anchor claw assembly.

2. The grouting anchor rod suitable for layered broken rock mass according to claim 1, characterized in that: The interior of the anchor rod body is hollow, the front end of the anchor rod body is a closed end, and the rear end of the anchor rod body is an open end.

3. The grouting anchor suitable for layered broken rock mass according to claim 2, characterized in that: The telescopic fluke assembly comprises at least two groups of umbrella-shaped opening and closing brackets, which are spaced apart and distributed along the axial direction of the anchor rod body; and the opening and closing brackets are all installed on a single opening and closing bracket segment.

4. The grouting anchor suitable for layered broken rock mass according to claim 3, characterized in that: The opening and closing brackets include a plurality of swing rods evenly distributed on the outer periphery of the anchor rod body. The outer periphery of the anchor rod body is provided with an installation gap for installing each swing rod. The installation gap is connected to the interior of the anchor rod body and serves as a part of the grouting channel.

5. The grouting anchor suitable for layered broken rock mass according to claim 4, characterized in that: The front end of the rocker arm is hinged at the front end of the installation gap, the non-end of the rocker arm is hinged with a connecting rod, the other end of the connecting rod is hinged with a push rod, the push rod is located inside the anchor rod body and parallel to the axial direction of the anchor rod body, and in all opening and closing brackets, the connecting rods of the front and rear rocker arms with the same circumferential position share the same push rod.

6. The grouting anchor suitable for layered broken rock mass according to claim 5, characterized in that: The push rod is a telescopic rod.

7. The grouting anchor suitable for layered broken rock mass according to claim 5, characterized in that: The rear ends of the push rods extend to the middle and rear parts of the anchor rod body and are connected to telescopic springs. The axial directions of the telescopic springs are parallel to the axial directions of the anchor rod body. The front ends of the telescopic springs are fixed to the anchor rod body. The rear ends of the push rods are passed through the interior of the telescopic springs to the rear ends of the telescopic springs and are fixed to the rear ends of the telescopic springs. An L-shaped clamping rod is also fixed to the rear ends of the push rods and is located on the rear side of the telescopic springs.

8. The grouting anchor rod suitable for layered broken rock mass according to claim 7, characterized in that: A hollow screw is provided on the rear end opening of the anchor rod body, and the part of the screw located outside the anchor rod body is threadedly connected with a nut which is abutted against the rear end surface of the anchor rod body, and the end of the screw located inside the anchor rod body is evenly distributed along the circumference with a plurality of convex teeth for pulling against the corresponding elbow of the clamping rod, and the gap between adjacent convex teeth is the disengagement gap of the elbow of the clamping rod.

9. The grouting anchor suitable for layered broken rock mass according to claim 8, characterized in that: A tray sleeved on the outer periphery of the screw is arranged between the nut and the rear end surface of the anchor rod body, and a grouting pipe is inserted into the hollow interior of the screw rod. The grouting pipe extends forward and together with the hollow interior of the anchor rod body and the installation gap forms a grouting channel.

10. A construction method for grouting anchors suitable for layered broken rock mass according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Assemble the anchor rod: Assemble the anchor rod according to the rock mass conditions as shown in the figure, so that the arrangement of the umbrella-shaped opening and closing bracket corresponds to the broken rock mass position. At this time, the turning head of the clamping rod and the corresponding convex teeth at the front end of the screw rod are mutually pulled and hooked, the telescopic spring is in a stretched state, and the swing rod of the opening and closing bracket is retracted into the corresponding installation gap; S2: Anchor installation: After the assembled anchor is placed in the rock mass to be reinforced, the screw is rotated so that the turning head of the clamping rod is separated from the corresponding convex teeth at the front end of the screw rod at the moment of the disengagement gap, the tension of the telescopic spring is released and the elastic energy is released, the rear end of the telescopic spring moves forward with the push rod, the push rod drives the umbrella-shaped opening and closing bracket to open through the connecting rod, and the swing rod swings outward to clamp the rock mass; S3: Grouting: insert the grouting pipe along the middle of the screw rod, and inject grout into the grouting channel. The grouting liquid is injected into the broken rock mass through the inside of the anchor rod body and the installation gap along the grouting pipe in sequence, until the grouting liquid fills the entire space to be filled and overflows from the grouting port. After a certain period of time, the grouting liquid solidifies and the anchor rod and the rock mass to be reinforced form an anchored integrated structure. S4: Prestressing: The nut is rotated to apply prestressing force, which further enhances the anchoring effect.

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