Dish wing type mechanical pre-stressed anchor rod and construction method thereof

Abstract

The invention relates to a butterfly wing type mechanical pre-stressed anchor rod and a construction method thereof.The anchor rod comprises an anchor rod body and a butterfly wing assembly, and the butterfly wing assembly is arranged outside the front end of the anchor rod body and comprises a hinge rib plate, a spring, a bolt and a butterfly wing-shaped barb component; the hinged rib plate is fixed outside the front end of the anchor rod body, the butterfly wing-shaped barb component sleeves the hinged rib plate and is connected with the hinged rib plate through a bolt, and the spring is mounted at the joint; the butterfly-wing-shaped barb component is arranged in the length direction of the anchor rod body, the rear end of the butterfly-wing-shaped barb component tilts outwards, and when the anchor rod body moves backwards, the butterfly-wing-shaped barb component clamps surrounding rock and is limited to move. On the basis of an original common anchor rod, the disc wing type structure is additionally arranged, the effective length of the anchor rod is increased, the anchoring length of the front end of the anchor rod is reduced, and the utilization efficiency of the anchor rod is improved. Meanwhile, pretension force can be applied according to needs, deformation of the stratum is restrained, and the safety of the structure is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and particularly relates to a disc-wing type mechanical prestressed bolt and a construction method thereof. Background Art

[0002] In drill and blast method construction, a rock drilling jumbo is generally used to drill holes, and the rock mass is broken by blasting to form a cavity. This is the main construction method for tunnel excavation. When a composite lining structure is used in the construction of a drill and blast method tunnel, driving bolts around the tunnel is an important process. As a tension member penetrating into the stratum, one end of the bolt is connected to the lining and the other end penetrates into the surrounding rock.

[0003] However, the mortar bolts and hollow grouting bolts driven around the tunnel cannot effectively play their roles at the ends, and a certain anchoring length is required, resulting in a shortening of the actual effective length of the bolts and a significant reduction in the effectiveness of the bolts.

[0004] Therefore, it is necessary to propose new measures to overcome the above defects. Summary of the Invention

[0005] The purpose of the present invention is to provide a disc-wing type mechanical prestressed bolt and a construction method thereof to solve the problem of the short effective length of existing bolts.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] Provide a disc-wing type mechanical prestressed bolt, the bolt includes a bolt rod body and a disc-wing assembly, the disc-wing assembly is arranged outside the front end of the bolt rod body, and includes a hinged rib plate, a spring, a bolt and a disc-wing shaped barb member;

[0008] The hinged rib plate is fixed outside the front end of the bolt rod body, the disc-wing shaped barb member is sleeved on the hinged rib plate and connected by the bolt, and the spring is installed at the connection;

[0009] The disc-wing shaped barb member is arranged along the length direction of the bolt rod body, and the rear end tilts outwards. When the bolt rod body moves backward, the disc-wing shaped barb member gets stuck in the surrounding rock and is restricted from moving.

[0010] Further, the bolt rod body is a hollow bolt rod body or a solid bolt rod body.

[0011] Further, the disc-wing assembly further includes a disc-wing member sleeve, the hinged rib plate is fixed to the outer wall of the disc-wing member sleeve and is perpendicular to the outer wall;

[0012] The hollow bolt rod body has an external thread, the disc-wing member sleeve has an internal thread, and the disc-wing member sleeve is sleeved outside the front end of the hollow bolt rod body.

[0013] Alternatively, the front end of the solid anchor rod body has a smooth outer wall, and the articulated rib plate is directly fixed to the outside of the front end of the solid anchor rod body.

[0014] Furthermore, the butterfly-wing-shaped barb member is provided with a vertical perforation for the articulated rib plate, and a horizontal reserved bolt hole for the butterfly-wing-shaped barb member is arranged at the position of the perforation for the articulated rib plate;

[0015] The articulated rib plate is provided with a horizontal reserved bolt hole for the rib plate. After the articulated rib plate is inserted into the perforation for the articulated rib plate, the reserved bolt hole for the butterfly-wing-shaped barb member and the reserved bolt hole for the rib plate are horizontally opposite and connected to each other through the bolt.

[0016] Furthermore, the spring is located in the reserved bolt hole for the rib plate. One end of the spring is inserted and fixed in the reserved bolt hole for the rib plate, and the other end is fixed to the butterfly-wing-shaped barb member.

[0017] Furthermore, two butterfly-wing assemblies are arranged outside the front end of the anchor rod body, and are arranged opposite to each other in a straight line;

[0018] Alternatively, four butterfly-wing assemblies are arranged outside the front end of the anchor rod body, and are evenly arranged in a cross shape.

[0019] Furthermore, a water-swelling rubber and a backing plate are arranged at the rear end of the anchor rod body, and are anchored by a nut.

[0020] On the other hand, a construction method of the butterfly-wing type mechanical prestressed anchor rod as described above is provided, and the method includes:

[0021] Drilling;

[0022] When using a hollow anchor rod body, insert the hollow anchor rod body into the hole, and the insertion depth is slightly deeper than the designed depth. Then pull the hollow anchor rod body outwards. When the hollow anchor rod body is clamped tightly, install the water-swelling rubber and the backing plate in sequence, and tighten the nut. Then, grout.

[0023] When using a solid anchor rod body, first grout or pour in the anchoring glue in the hole, then insert the solid anchor rod body, and the insertion depth is slightly deeper than the designed depth. When the solid anchor rod body is clamped tightly, install the water-swelling rubber and the backing plate in sequence, and tighten the nut.

[0024] Furthermore, when manufacturing the butterfly-wing type mechanical prestressed anchor rod, the calculation process for the number of butterfly-wing-shaped barb members is as follows:

[0025]

[0026] In the formula:

[0027] The number of butterfly-wing-shaped barbs components arranged;

[0028] F - The pre-tension of the butterfly-wing mechanical prestressed anchor bolt;

[0029] F1 - The pre-tension that the butterfly-wing-shaped barbs component can withstand;

[0030] K - Safety factor;

[0031] The dimensions of the butterfly-wing-shaped barbs component meet the following requirements:

[0032] L1 ≥ L2

[0033]

[0034] Where:

[0035] L1 - The length of the front end of the butterfly-wing-shaped barbs component;

[0036] L2 - The length of the tail end of the butterfly-wing-shaped barbs component;

[0037] α - The included angle of the butterfly-wing-shaped barbs component;

[0038] D - The diameter of the anchor bolt borehole;

[0039] D0 - The diameter of the sleeve of the butterfly-wing component;

[0040] The calculation process of the bolt cross-sectional area is as follows:

[0041]

[0042] Where:

[0043] F2 - The shear force of the bolt;

[0044] b - The height of the rib plate;

[0045] a - The distance between the butterfly-wing-shaped barbs component and the edge;

[0046] A - The bolt cross-sectional area;

[0047] - The design value of the shear strength of the bolt;

[0048] The dimensions of the rib plate meet the following requirements:

[0049]

[0050] b e = 2t + 16 ≤ d

[0051] Where:

[0052] c - The clear distance between the two side edges of the connecting rib plate and the edge of the bolt hole;

[0053] The thickness of the t-stiffener;

[0054] d - The net distance connecting the end edge of the stiffener and the edge of the bolt hole;

[0055] b e - The effective calculated width of the stiffener;

[0056] The calculation requirement for the tensile strength at the net section of the stiffener hole is as follows:

[0057]

[0058] In the formula:

[0059] σ1 - The tensile strength at the net section of the stiffener hole;

[0060] f1 - The design value of the tensile strength at the net section of the stiffener hole;

[0061] e - The calculated width of the stiffener;

[0062] b0 - The diameter of the bolt hole;

[0063] The calculation requirement for the tensile strength at the end section of the stiffener is as follows:

[0064]

[0065] In the formula:

[0066] σ2 - The tensile strength at the end section of the stiffener;

[0067] f2 - The design value of the tensile strength at the end section of the stiffener;

[0068] d0 - The diameter of the reserved bolt hole (12) of the stiffener;

[0069] The calculation requirement for the shear strength of the stiffener is as follows:

[0070]

[0071] In the formula:

[0072] τ - The shear strength of the stiffener;

[0073] f v - The design value of the shear strength of the stiffener steel;

[0074] Z - The shear calculation width of the end section of the stiffener.

[0075] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0076] The present invention provides a disc-wing type mechanically prestressed anchor rod and its construction method. A disc-wing type structure is added on the basis of the original ordinary anchor rod, which increases the effective length of the anchor rod, reduces the anchoring length at the front end of the anchor rod, and improves the utilization efficiency of the anchor rod. At the same time, prestress can be applied as needed to restrain the deformation of the formation and improve the safety of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0078] Figure 1 It is a structural diagram of Embodiment 1 of the present invention.

[0079] Figure 2 It is a side view of the movable straight-wing disc-wing component of Embodiment 1 of the present invention.

[0080] Figure 3 It is Figure 2 the a-a view of the movable straight-wing disc-wing component in

[0081] Figure 4 It is a structural diagram of Embodiment 2 of the present invention.

[0082] Figure 5 It is a side view of the movable cross-wing disc-wing component of Embodiment 2 of the present invention.

[0083] Figure 6 It is Figure 5 the b-b view of the movable cross-wing disc-wing component in

[0084] Figure 7 It is a structural diagram of Embodiment 3 of the present invention.

[0085] Figure 8 It is Figure 7 the c-c view of the fixed straight-wing disc-wing component in

[0086] Figure 9 It is a structural diagram of Embodiment 4 of the present invention.

[0087] Figure 10 It is Figure 9 the d-d view of the fixed cross-wing disc-wing component in

[0088] Figure 11 It is a structural diagram of the disc-wing shaped barbs component.

[0089] Figure 12 It is Figure 11The A-A view.

[0090] Figure 13 is Figure 11 The B-B view.

[0091] Figure 14 is the structural diagram of the rib plate.

[0092] Figure 15 is the structural diagram of the spring.

[0093] Figure 16 is the calculation diagram of the barbed butterfly wing size.

[0094] Figure 17 is the calculation diagram of the bolt force.

[0095] Figure 18 is the calculation diagram of the barbed butterfly wing force.

[0096] Figure 19 is the structural dimension diagram of the rib plate.

[0097] The markings in the figure are:

[0098] 1 - Hollow anchor rod body; 2 - Butterfly wing component sleeve; 3 - Hinged rib plate; 4 - Spring; 5 - Reserved spring fixing hole for rib plate; 6 - Barbed butterfly wing component; 7 - Water-swelling rubber; 8 - Base plate; 9 - Nut; 10 - Bolt; 11 - Reserved bolt hole for barbed butterfly wing component; 12 - Reserved bolt hole for rib plate; 13 - Solid anchor rod body; 14 - Thread. Specific implementation manner

[0099] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0100] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0101] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, terms such as "installation", "connection", "setting", etc. should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0102] It should also be noted that although the order of steps is involved in the method description, in some cases, it can be executed in a different order from here, and it should not be understood as a limitation on the order of steps.

[0103] In the specific implementation manner, the Figure 1 left side is defined as the front, and the Figure 1 right side is defined as the right. The Figure 11 direction from top to bottom is defined as the vertical direction, and the direction perpendicular to it is defined as the horizontal direction.

[0104] The present invention provides a disc-wing type mechanical prestressed anchor rod. A disc-wing assembly is arranged at the front end of the anchor rod body. Without shortening the effective length of the anchor rod body, it plays a role of self-locking and anchoring. The structural form is simple and reliable, has little influence on the cost of the anchor rod, and has strong practicability.

[0105] Specifically, the anchor rod includes an anchor rod body and a disc-wing assembly. The disc-wing assembly is arranged outside the front end of the anchor rod body. The anchor rod body can adopt a hollow anchor rod body 1 or a solid anchor rod body 13.

[0106] When the anchor rod body adopts a hollow anchor rod body 1, the disc-wing assembly includes a disc-wing component sleeve 2, a hinged rib plate 3, a spring 4, a bolt 10, and a disc-wing shaped barb component 6. The hollow anchor rod body 1 has an external thread, and the disc-wing component sleeve 2 has an internal thread. The disc-wing component sleeve 2 is sleeved outside the front end of the hollow anchor rod body 1. The hinged rib plate 3 is fixed to the outer wall of the disc-wing component sleeve 2 and is perpendicular to the outer wall. The disc-wing shaped barb component 6 is sleeved on the hinged rib plate 3 and is connected by a bolt 10, and a spring 4 is installed at the connection.

[0107] When the anchor rod body adopts a solid anchor rod body 13, the disc-wing assembly includes a hinged rib plate 3, a spring 4, a bolt 10, and a disc-wing shaped barb component 6, and the disc-wing component sleeve 2 is not provided. The front end outside of the solid anchor rod body 13 has a smooth outer wall. The hinged rib plate 3 is directly fixed to the front end outside of the solid anchor rod body 13, and the rear end of the solid anchor rod body 13 has an external thread.

[0108] As Figure 11 - 13 , the disc-wing shaped barb component 6 is provided with a vertical hinged rib plate perforation, and a horizontal disc-wing shaped barb component reserved bolt hole 11 is arranged at the position of the hinged rib plate perforation. As Figure 14, a horizontal rib reserved bolt hole 12 is provided on the articulated rib plate 3. After the articulated rib plate 3 is inserted into the perforation of the articulated rib plate, the reserved bolt hole 11 of the butterfly-wing barb member and the rib reserved bolt hole 12 are horizontally opposite and connected to each other through a bolt 10. The spring 4 is located in the rib reserved bolt hole 12, and the shape of the spring 4 is as Figure 15 shown. One end of the spring 4 is inserted and fixed in the rib reserved bolt hole 12, and the other end is fixed on the butterfly-wing barb member 6. The butterfly-wing barb member 6 is arranged along the length direction of the bolt body. The rear end tilts outwards. When the bolt body moves backward, the butterfly-wing barb member 6 gets stuck in the surrounding rock and is restricted from moving. Specifically, when inserting the bolt body into the hole, the butterfly-wing barb member 6 is subjected to the surrounding rock pressure towards the bolt body and retracts inward under the support of the spring 4, and the bolt body can continue to be inserted smoothly. When the bolt body is inserted to the bottom of the hole, under the support of the spring 4, the butterfly-wing barb member 6 simultaneously receives an outward pressure and gets stuck in the surrounding rock, similar to barbs, making the bolt body unable to retract and being anchored and locked in this position.

[0109] The rear end of the bolt body is provided with a water-swelling rubber 7 and a backing plate 8, and is anchored by a nut 9. The water-swelling rubber 7 swells when encountering water during bolt grouting or injecting anchoring agent, and can block the cement slurry or anchoring agent.

[0110] In some embodiments, two butterfly-wing assemblies are provided outside the front end of the bolt body and are arranged opposite to each other in a straight line. In some other embodiments, four butterfly-wing assemblies are provided outside the front end of the bolt body and are evenly arranged in a cross shape.

[0111] According to the different types of bolt bodies and the different numbers of butterfly-wing assemblies, the structure of the present invention has but is not limited to the following four embodiments:

[0112] Embodiment 1:

[0113] As Figure 1 - 3 , in this embodiment, the bolt body adopts a hollow bolt body 1, two butterfly-wing assemblies are provided and are arranged opposite to each other in a straight line. The butterfly-wing assembly includes a butterfly-wing member sleeve 2, an articulated rib plate 3, a spring 4, a bolt 10 and a butterfly-wing barb member 6.

[0114] Embodiment 2:

[0115] As Figure 4 - 6 , in this embodiment, the bolt body adopts a hollow bolt body 1, four butterfly-wing assemblies are provided and are evenly arranged in a cross shape. The butterfly-wing assembly includes a butterfly-wing member sleeve 2, an articulated rib plate 3, a spring 4, a bolt 10 and a butterfly-wing barb member 6.

[0116] Embodiment 3:

[0117] As Figure 7 - 8, in this embodiment, the anchor rod body adopts a solid anchor rod body 13. There are two butterfly wing assemblies arranged opposite to each other in a straight line. The butterfly wing assembly includes a butterfly wing component sleeve 2, a hinged rib plate 3, a spring 4, a bolt 10, and a butterfly wing-shaped barbed component 6.

[0118] Embodiment 4:

[0119] Such as Figure 9 - 10 , in this embodiment, the anchor rod body adopts a solid anchor rod body 13. There are four butterfly wing assemblies arranged evenly in a cross shape. The butterfly wing assembly includes a butterfly wing component sleeve 2, a hinged rib plate 3, a spring 4, a bolt 10, and a butterfly wing-shaped barbed component 6.

[0120] Of course, in other embodiments, the number of butterfly wing assemblies can also be changed according to actual needs, and multiple can be flexibly set, not limited to 2 or 4. Specifically, when manufacturing the butterfly wing type mechanical prestressed anchor rod, the calculation process for the number of butterfly wing-shaped barbed components 6 is as follows:

[0121]

[0122] In the formula:

[0123] n - The number of butterfly wing-shaped barbed components 6;

[0124] F - The prestress of the butterfly wing type mechanical prestressed anchor rod;

[0125] F1 - The prestress that the butterfly wing-shaped barbed component 6 can withstand;

[0126] K - Safety factor;

[0127] The dimensions of the butterfly wing-shaped barbed component 6 meet the following requirements:

[0128] L1≥L2

[0129]

[0130] In the formula:

[0131] L1 - The length of the front end of the butterfly wing-shaped barbed component 6;

[0132] L2 - The length of the tail end of the butterfly wing-shaped barbed component 6;

[0133] α - The included angle of the butterfly wing-shaped barbed component 6;

[0134] D - The diameter of the anchor rod borehole;

[0135] D0 - The diameter of the butterfly wing component sleeve 2;

[0136] The calculation process for the cross-sectional area of the bolt 10 is as follows:

[0137]

[0138] In the formula:

[0139] F2 - Shearing force of bolt 10;

[0140] b - Height of rib plate 3;

[0141] a - Distance between the butterfly-wing-shaped barbs member 6 and the edge;

[0142] A - Cross-sectional area of bolt 10;

[0143] - Design value of shear strength of bolt 10;

[0144] The dimensions of rib plate 3 shall meet the following requirements:

[0145]

[0146] b e = 2t + 16 ≤ d

[0147] In the formula:

[0148] c - Net distance between the two side edges of the connecting rib plate 3 and the edge of the bolt 10 hole; t - Thickness of rib plate 3;

[0149] d - Net distance between the end edge of the connecting rib plate 3 and the edge of the bolt 10 hole; b e - Effective calculated width of rib plate 3;

[0150] The calculation requirement for the tensile strength at the net cross-section of the rib plate 3 holes is:

[0151]

[0152] In the formula:

[0153] σ1 - Tensile strength at the net cross-section of the rib plate 3 holes;

[0154] f1 - Design value of tensile strength at the net cross-section of the rib plate 3 holes;

[0155] e - Calculated width of rib plate 3;

[0156] b0 - Bore diameter of bolt 10 hole;

[0157] The calculation requirement for the tensile strength at the end cross-section of the rib plate 3 is:

[0158]

[0159] In the formula:

[0160] σ2 - Tensile strength at the end cross-section of the rib plate 3;

[0161] f2 - Design value of tensile strength at the end cross-section of the rib plate 3;

[0162] The aperture of the reserved bolt hole (12) of the d0 - rib plate

[0163] The calculation requirement for the shear strength of the rib plate 3 is as follows:

[0164]

[0165] In the formula:

[0166] τ - Shear strength of the rib plate 3

[0167] f v - Design value of the shear strength of the steel material of the rib plate 3

[0168] Z - Shear calculation width of the end section of the rib plate 3

[0169] In the structure of the present invention, the butterfly wing assembly can adopt the sleeve structure form as needed, and is manufactured by factory production, which is convenient for large - scale application. The number of butterfly wing assemblies can be flexibly set according to needs, and can be installed in a supporting manner in combination with the geological conditions. The butterfly wing - type structural member can also be welded on the anchor rod, and the installation method is flexible and reliable. At the same time, the anchor rod body can adopt a hollow - type structural member or a solid steel bar member, with strong practicability.

[0170] The construction method of the above - mentioned butterfly wing - type mechanical prestressed anchor rod specifically includes the following steps:

[0171] S1: Drill a hole at the position where the anchor rod is set. When drilling, it should be slightly deeper than the designed length of the anchor rod body. After drilling, clean the hole.

[0172] S2: When using the hollow - type anchor rod body 1, insert the hollow - type anchor rod body 1 into the hole, and the insertion depth is slightly deeper than the designed depth. Then pull the hollow - type anchor rod body 1 outwards. When the hollow - type anchor rod body 1 is clamped tightly, install the water - swelling rubber 7 and the backing plate 8 in sequence, and tighten the nut 9. Then carry out grouting.

[0173] When the hollow - type anchor rod body 1 cannot be clamped tightly or the outward stretching distance is too long, the hollow - type anchor rod body 1 should be re - inserted and rotated. During the rotation process, try to pull it outwards at the same time until the hollow - type anchor rod body 1 is clamped tightly, and then carry out grouting.

[0174] S3: When using the solid - type anchor rod body 13, first grout or pour the anchoring glue into the hole, and then insert the solid - type anchor rod body 13. The insertion depth is slightly deeper than the designed depth. When the solid - type anchor rod body 13 is clamped tightly, install the water - swelling rubber 7 and the backing plate 8 in sequence, and tighten the nut 9.

[0175] If it cannot be clamped tightly, the solid - type anchor rod body 13 can be rotated while trying to pull the solid - type anchor rod body 13 outwards until the solid - type anchor rod body 13 is clamped tightly.

[0176] S4: When using the hollow anchor rod body 1, inject cement slurry or anchoring agent until the cement slurry or anchoring agent overflows from the end of the anchor rod, maintain a certain pressure, and end the grouting after the water-swellable rubber 7 swells and there is no leakage of cement slurry and anchoring agent. When using the solid anchor rod body 13, supplement the injection of cement slurry or anchoring agent within the range of the rod body until the anchor rod body is completely wrapped.

[0177] S5: After the cement slurry or anchoring agent reaches the predetermined strength, apply the pre-tension force as needed. After applying the pre-tension force, tighten the nut 10 in time. When necessary, additional gaskets can be added to keep the anchor rod in a stable pre-tension state.

[0178] The present invention adopts a butterfly-wing type mechanical prestressed anchor rod. By setting a mechanical anchoring device at the end of the anchor rod, the root of the anchor rod directly plays a fixing role, increasing the actual effective length of the anchor rod. At the same time, the pre-tension force can be applied to improve the integrity of the surrounding rock and better form an arch effect. It is also very different from the mechanism of the currently used expanding shell anchor rod, which can more effectively enhance the prestress effect. Moreover, the construction method does not add new workload on the basis of the existing anchor rod. The pre-tension force adopted in the present invention can be applied according to needs during construction to reduce the deformation of the tunnel or slope protection. Even when applying a very small pre-tension force, it can also well improve the initial effect of the anchor rod compared with the conventional anchor rod without applying pre-tension force.

[0179] The above uses specific examples to elaborate on the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the technical field to which the present invention pertains, according to the idea of the present invention, several simple deductions, deformations or substitutions can also be made.

Claims

1. Disc-wing type mechanical prestressed anchor, characterized by: The anchor rod comprises an anchor rod body and a butterfly wing assembly, wherein the butterfly wing assembly is arranged outside the front end of the anchor rod body and comprises a hinged rib plate (3), a spring (4), a bolt (10) and a butterfly wing-shaped barbed member (6); The hinged rib plate (3) is fixed outside the front end of the anchor rod body, the butterfly-wing-shaped barbed member (6) is sleeved on the hinged rib plate (3) and connected via the bolt (10), and the spring (4) is installed at the connection point; The butterfly-wing-shaped barbed member (6) is arranged along the length direction of the anchor rod body, with the rear end tilted outwards. When the anchor rod body moves backwards, the butterfly-wing-shaped barbed member (6) is stuck to the surrounding rock and is restricted from moving.

2. The disc-wing type mechanical prestressed anchor rod according to claim 1, characterized in that: The anchor rod body is a hollow anchor rod body (1) or a solid anchor rod body (13).

3. The disc-wing type mechanical prestressed anchor rod according to claim 2, characterized in that: The butterfly wing assembly further comprises a butterfly wing component sleeve (2), and the hinged rib plate (3) is fixed to the outer wall of the butterfly wing component sleeve (2) and is perpendicular to the outer wall; The hollow anchor rod body (1) has an external thread, the butterfly wing component sleeve (2) has an internal thread, and the butterfly wing component sleeve (2) is sleeved outside the front end of the hollow anchor rod body (1).

4. The disc-wing type mechanical prestressed anchor rod according to claim 2, characterized in that: The front end of the solid anchor rod body (13) is a smooth outer wall, and the hinged rib plate (3) is directly fixed to the front end of the solid anchor rod body (13).

5. The disc-wing type mechanical prestressed anchor rod according to claim 1, characterized in that: The butterfly-wing-shaped barbed member (6) is provided with a vertical hinged rib plate through hole, and a horizontal butterfly-wing-shaped barbed member reserved bolt hole (11) is provided at the position of the hinged rib plate through hole; The hinged rib (3) is provided with a horizontal rib reserved bolt hole (12). After the hinged rib (3) is inserted into the hinged rib through hole, the butterfly-wing-shaped barbed member reserved bolt hole (11) and the rib reserved bolt hole (12) are horizontally opposite to each other and connected to each other through the bolt (10).

6. The disc-wing type mechanical prestressed anchor rod according to claim 5, characterized in that: The spring (4) is located in the reserved bolt hole (12) of the rib plate, one end of the spring (4) is inserted into and fixed in the reserved bolt hole (12) of the rib plate, and the other end is fixed on the butterfly-wing-shaped barbed component (6).

7. The disc-wing type mechanical prestressed anchor rod according to claim 1, characterized in that: Two butterfly wing assemblies are provided outside the front end of the anchor rod body and are arranged opposite to each other in a straight line; Alternatively, four butterfly wing assemblies are provided outside the front end of the anchor rod body and are evenly arranged in a cross shape.

8. The disc-wing type mechanical prestressed anchor rod according to claim 1, characterized in that: The rear end of the anchor rod body is provided with water-expanding rubber (7) and a pad (8), and is anchored by a nut (9).

9. The construction method of the disc-wing type mechanical prestressed anchor rod according to claim 1, characterized in that: The method comprises: drilling; When a hollow anchor rod body (1) is used, the hollow anchor rod body (1) is inserted into the hole to a depth slightly deeper than the designed depth, and then the hollow anchor rod body (1) is pulled outward. When the hollow anchor rod body (1) is clamped, the water-expanding rubber (7) and the pad (8) are installed in sequence, and the nut (9) is tightened, and then grouting is performed; When a solid anchor rod body (13) is used, grouting or anchoring glue is first injected into the hole, and then the solid anchor rod body (13) is inserted. The insertion depth is slightly deeper than the design depth. When the solid anchor rod body (13) is clamped, the water-expanding rubber (7) and the pad (8) are installed in sequence, and the nut (9) is tightened.

10. The construction method of the disc-wing type mechanical prestressed anchor rod according to claim 9, characterized in that: When manufacturing a disc-wing type mechanical prestressed anchor rod, the calculation process of the number of butterfly-wing shaped barbed components (6) is as follows: Where: n-the number of butterfly-wing-shaped barbed components (6) provided; F- pretension of butterfly-wing mechanical prestressed anchor; F1-pretension that the butterfly-wing-shaped barbed member (6) can bear; K-safety factor; The dimensions of the butterfly-wing-shaped barbed member (6) meet the following requirements: L1 ≥ L2 Where: L1 - the length of the front end of the butterfly-wing-shaped barbed member (6); L2-the length of the tail end of the butterfly-wing-shaped barbed member (6); α-the included angle of the butterfly-wing-shaped barbed member (6); D-anchor drilling diameter; D0-diameter of the butterfly wing member sleeve (2); The calculation process of the cross-sectional area of ​​the bolt (10) is: Where: F2- shear force of bolt (10); b-the height of the rib (3); a-the distance between the butterfly-wing-shaped barbed member (6) and the edge; A-cross-sectional area of ​​bolt (10); f v b - Design value of shear strength of the bolt (10); The dimensions of the rib plate (3) meet the following requirements: b e =2t+16≤d Where: c-the clear distance between the edges of the two sides of the connecting rib plate (3) and the edges of the bolt (10) holes; t-the thickness of the rib plate (3); d-the clear distance between the end edge of the connecting rib plate (3) and the edge of the bolt (10) hole; b e - the effective calculated width of the rib (3); The calculation requirement for the tensile strength at the net cross section of the rib plate (3) hole is: Where: σ1-tensile strength at the net cross section of the rib plate (3); f1-design value of tensile strength at the net cross section of the rib plate (3); e-the calculated width of the rib (3); b0-bolt (10) hole diameter; The calculation requirement for the tensile strength of the end section of the rib plate (3) is: Where: σ2- tensile strength of the rib (3) end section; f2-design value of tensile strength of the end section of the rib (3); d0-diameter of the bolt hole (12) reserved in the rib plate; The calculation requirements for the shear strength of the rib plate (3) are: Where: τ- shear strength of rib (3); f v - Design value of shear strength of rib plate (3) steel; Z-rib (3) end section shear calculation width.

Images