A layered and sequenced anchoring large deformation anchor device and its use method

Abstract

The present invention relates to the technical field of tunnel support, and discloses a layered and sequenced anchoring large deformation anchor rod device and a method for using the same, comprising a plurality of hollow anchor rods, which are connected end to end and arranged in series in an anchor hole, a first shotcrete unit being arranged between two adjacent hollow anchor rods, a first shotcrete device being arranged in the first shotcrete unit, a second shotcrete unit being arranged at the end of the hollow anchor rod at the bottom end of the anchor rod device away from the first shotcrete unit, a second shotcrete device being arranged in the second shotcrete unit, a sliding rheostat being arranged in the hollow anchor rod, a deformation monitor being arranged outside the anchor hole, the deformation monitor being connected to the sliding rheostat, the first shotcrete device and the second shotcrete device via a wire, the first shotcrete unit and the second shotcrete unit being filled with AB anchor glue, and the present invention improves the safety of underground projects and reduces construction and operation and maintenance costs.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel support, and in particular to a layered and sequenced anchoring large deformation anchor rod device and a use method thereof. Background Art

[0002] Controlling tunnel surrounding rock deformation and stability has always been a serious challenge during the construction and operation of underground projects. Traditional underground engineering support methods often use static support structures such as anchor rods and cables. However, these support structures are difficult to adjust to the staged characteristics of tunnel surrounding rock deformation, which can easily lead to poor support effects or excessive support capacity. Currently, research in the field of underground engineering support mainly focuses on the following aspects:

[0003] (1) Limitations of traditional underground engineering support methods: Traditional underground engineering support methods mainly include anchor rods, anchor cables, steel frames, etc. Their support capacity is difficult to adjust according to the deformation of the surrounding rock, and their ability to respond to the continuous deformation and dynamic changes of the surrounding rock is limited;

[0004] (2) Development of intelligent support technology: With the development of intelligent technology, more and more research is devoted to the development of intelligent underground engineering support systems, which can realize real-time monitoring of surrounding rock deformation through sensors, data acquisition and control systems;

[0005] (3) Improvement of anchor technology: In response to the problems existing in traditional anchor support, some researchers have proposed some improvement solutions, such as anchors with adjustable length and anchors with deformation capabilities, but these solutions still have certain limitations.

[0006] Therefore, there is an urgent need for a layered and sequenced anchoring large deformation anchor device and its use method that can overcome the limitations of traditional underground engineering support methods and improve the safety and stability of underground engineering. Summary of the Invention

[0007] The purpose of the present invention is to provide a layered and sequential anchoring large deformation anchor device and a method of using the same, aiming to solve or improve at least one of the above-mentioned technical problems.

[0008] To achieve the above-mentioned object, the present invention provides the following solution: The present invention provides a layered and sequenced anchoring large deformation anchor device, comprising:

[0009] A plurality of hollow anchor rods, wherein the plurality of hollow anchor rods are connected end to end and arranged in series in an anchor hole, a first spraying unit is arranged between two adjacent hollow anchor rods, a first spraying device is arranged in the first spraying unit, a second spraying unit is arranged at the end of the hollow anchor rod at the bottom end of the anchor rod device away from the first spraying unit, a second spraying device is arranged in the second spraying unit, and a sliding rheostat is arranged in the hollow anchor rod;

[0010] A deformation monitor, the deformation monitor being arranged outside the anchor hole and connected to the sliding rheostat, the first spraying device, and the second spraying device via a wire;

[0011] The first spraying unit and the second spraying unit are both filled with AB anchor glue.

[0012] Optionally, the first grouting unit includes a pair of first grouting plugs, which are respectively connected to the two adjacent hollow anchor rods one by one. A first cavity is opened in the first grouting plug, and the first grouting device is arranged in the first cavity, and the first cavity is filled with the A agent of the AB anchor glue. A first grouting steel bar is connected between the pair of first grouting plugs, and a first grouting channel is opened in the first grouting steel bar. Both ends of the first grouting channel are respectively connected to the pair of first cavities, and the first grouting channel is filled with the B agent of the AB anchor glue. The first grouting steel bar is covered with a first grouting cover connected to the first grouting channel.

[0013] Optionally, a first one-way valve is provided at a node where the first cavity is connected to the first grouting channel.

[0014] Optionally, the second grouting unit includes a second grouting plug, which is connected to the hollow anchor rod, a second cavity is opened in the second grouting plug, the second grouting device is arranged in the second cavity, and the second cavity is filled with the A agent of the AB anchor glue, the second grouting plug is connected to the second grouting steel bar, a second grouting channel is opened in the second grouting steel bar, the second grouting channel is communicated with the second cavity, the second grouting channel is filled with the B agent of the AB anchor glue, and the second grouting steel bar is covered with a second grouting cover communicated with the second grouting channel.

[0015] Optionally, a second one-way valve is provided at a node where the second cavity is connected to the second grouting channel.

[0016] Optionally, the sliding rheostat includes a sensitive resistor and a conductive clamp ring, the sensitive resistor and the conductive clamp ring are both fixedly installed in the inner cavity of the hollow anchor rod, and the sensitive resistor and the conductive clamp ring are slidingly connected.

[0017] Optionally, a nut is further included, which is threadedly connected to the hollow anchor rod at the top of the anchor rod device, and a gasket strung on the hollow anchor rod is provided between the nut and the outer edge of the top opening of the anchor hole.

[0018] The present invention also provides a method for using a layered and sequenced anchoring large deformation anchor device, the method comprising the following steps:

[0019] Determining the number of the hollow anchor rods based on the anchoring points in the anchor hole, assembling the anchor rod device, and installing the anchor rod device in the anchor hole;

[0020] The deformation monitor controls the first spraying unit at the top of the anchor hole to spray the AB anchor glue so that the hollow anchor rod at the front end forms an initial anchor body;

[0021] The deformation monitor controls the plurality of first spraying units below the initial anchor body to sequentially spray the AB anchor glue, so that the plurality of hollow anchor rods above the bottommost first spraying unit form a new anchor body;

[0022] The deformation monitor controls the second spraying unit to spray out the AB anchor glue, so that the plurality of hollow anchor rods above the second spraying unit form a final anchor body.

[0023] Optionally, when the resistance value of any sliding rheostat in the new anchor body changes, the deformation monitor detects that the deformation of the hollow anchor rod and all the above hollow anchor rods as a whole reaches a preset value, and the deformation monitor controls the first spraying unit at the tail end of the next hollow anchor rod to spray the AB anchor glue.

[0024] Optionally, the method for calculating the deformation includes the following steps:

[0025] In the initial state, the sensitive resistance of the sliding rheostat in the hollow anchor rod at the top is R 0,i , which is expressed as follows:

[0026] R 0,i =ρL 0,i / S

[0027] Where ρ is the resistivity of the sensitive resistor, L 0,i is the initial sensitive resistor length of the i-th anchor rod, S is the cross-sectional area of ​​the sensitive resistor;

[0028] At time t, the sensitive resistance value R of the sliding rheostat in the hollow anchor rod at the top is t,i for:

[0029] R t,i =ρL t,i / S

[0030] Among them, L t,i is the sensitive resistance length of the hollow anchor rod at the top at time t;

[0031] By the initial resistance R 0,i and resistance value R at tt,i The single deformation occurring within time t can be calculated as:

[0032] ΔL t,i =L t,i -L 0,i =S(R t,i -R 0,i ) / ρ

[0033] Where, ΔL t,i is the single deformation of the topmost hollow anchor within time t.

[0034] Then, the total deformation of the topmost hollow anchor rod and any number of the hollow anchor rods below it is:

[0035]

[0036] Wherein, ΔL is the total deformation of a number of the hollow anchor rods within time t, that is, the deformation.

[0037] The present invention discloses the following technical effects: by forming an anchor rod device into a plurality of hollow anchor rods, a plurality of first grouting units and a second grouting unit, and utilizing the change of the circuit resistance detected by the sliding rheostat inside the hollow anchor rod with the deformation of the hollow anchor rod, at each anchoring point, the first grouting device in the first grouting unit sequentially sprays out and consolidates AB anchor glue when the hollow anchor rod reaches a preset deformation, thereby realizing layered and sequential anchoring of the anchor rod device, and when the internal circuit of the anchor rod device reaches the maximum set resistance, the second grouting device in the second grouting unit sprays out AB anchor glue to realize the overall anchoring of the anchor rod device, so that each part of the hollow anchor rod can be dynamically supported according to the real-time deformation of the surrounding rock, and the ability of each part of the hollow anchor rod to resist deformation is brought into play to the greatest extent, thereby solving the problems of poor support effect or excessive support capacity that are easily caused by static support of conventional anchor rods, improving the safety of underground projects, and reducing construction and operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0039] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 is a cross-sectional view of the hollow anchor rod of the present invention;

[0041] Figure 3 is a cross-sectional view of the first spraying unit of the present invention;

[0042] Figure 4This is a cross-sectional view of the second spraying unit of the present invention.

[0043] In the figure: 1. hollow anchor rod; 2. anchor hole; 3. first grouting unit; 3-1. first grouting device; 3-2. first grouting stop plug; 3-3. first cavity; 3-4. first grouting steel bar; 3-5. first grouting channel; 3-6. first grouting cover; 3-7. first one-way valve; 4. second grouting unit; 4-1. second grouting device; 4-2. second grouting stop plug; 4-3. second cavity; 4-4. second grouting steel bar; 4-5. second grouting channel; 4-6. second grouting cover; 4-7. second one-way valve; 5. sliding rheostat; 5-1. sensitive resistor; 5-2. conductive clamp; 6. deformation monitor; 7. wire; 8. nut; 9. gasket. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Reference Figures 1-4 The present invention provides a layered and sequenced anchoring large deformation anchor device, comprising:

[0047] A plurality of hollow anchor rods 1 are connected end to end and arranged in series in an anchor hole 2. A first shotcreting unit 3 is arranged between two adjacent hollow anchor rods 1. A first shotcreting device 3-1 is arranged in the first shotcreting unit 3. A second shotcreting unit 4 is arranged at the end of the hollow anchor rod 1 at the bottom end of the anchor rod device away from the first shotcreting unit 3. A second shotcreting device 4-1 is arranged in the second shotcreting unit 4. A sliding rheostat 5 is arranged in the hollow anchor rod 1.

[0048] The deformation monitor 6 is arranged outside the anchor hole 2 and is connected to the sliding rheostat 5, the first spraying device 3-1 and the second spraying device 4-1 via a wire 7;

[0049] The first spraying unit 3 and the second spraying unit 4 are both filled with AB anchoring glue.

[0050] The anchor rod device is composed of a plurality of hollow anchor rods 1, a plurality of first grouting units 3 and a second grouting unit 4, and the circuit resistance detected by the sliding rheostat 5 inside the hollow anchor rod 1 changes with the deformation of the hollow anchor rod 1, so that at each anchoring point, the first grouting device 3-1 in the first grouting unit 3 sprays AB anchor glue when the deformation of the hollow anchor rod 1 is large, thereby realizing layered and sequential anchoring of the anchor rod device, and when the internal circuit of the anchor rod device reaches the maximum set resistance, the second grouting device 4-1 in the second grouting unit 4 sprays AB anchor glue to realize the overall anchoring of the anchor rod device, so that each part of the hollow anchor rod 1 can be dynamically supported according to the real-time deformation of the surrounding rock, and the ability of each part of the hollow anchor rod 1 to resist deformation is brought into play to the greatest extent, thereby solving the problems of poor support effect or excessive support capacity that are easily caused by static support of conventional anchor rods, improving the safety of underground projects, and reducing construction and operation and maintenance costs.

[0051] Further optimization scheme, the first grouting unit 3 includes a pair of first grouting plugs 3-2, the pair of first grouting plugs 3-2 are respectively connected to the two adjacent hollow anchor rods 1 one by one, a first cavity 3-3 is opened in the first grouting plug 3-2, a first grouting device 3-1 is arranged in the first cavity 3-3, and the first cavity 3-3 is filled with agent A of AB anchor glue, a first grouting steel bar 3-4 is connected between the pair of first grouting plugs 3-2, a first grouting channel 3-5 is opened in the first grouting steel bar 3-4, both ends of the first grouting channel 3-5 are respectively connected to the pair of first cavities 3-3, the first grouting channel 3-5 is filled with agent B of AB anchor glue, and the first grouting steel bar 3-4 is covered with a first grouting cover 3-6 connected to the first grouting channel 3-5.

[0052] An end of the first grouting plug 3 - 2 away from the first grouting steel bar 3 - 4 is provided with a threaded opening that matches the thread of the hollow anchor rod 1 .

[0053] When the deformation monitor 6 issues an instruction to the first spraying device 3-1, the first spraying device 3-1 can squeeze the A agent of the AB anchor glue in the first cavity 3-3 into the first grouting channel 3-5 in the first grouting steel bar 3-4 to mix with the B agent of the AB anchor glue, and then sprayed by the first spraying hood 3-6.

[0054] To further optimize the solution, a first one-way valve 3-7 is provided at the node where the first cavity 3-3 is connected to the first grouting channel 3-5 to prevent agent A of the AB rebar embedding glue from flowing back into the first cavity 3-3.

[0055] Further optimization scheme, the second grouting unit 4 includes a second grouting plug 4-2, the second grouting plug 4-2 is connected to the hollow anchor rod 1, a second cavity 4-3 is opened in the second grouting plug 4-2, a second grouting device 4-1 is arranged in the second cavity 4-3, and the second cavity 4-3 is filled with agent A of AB anchor glue, the second grouting plug 4-2 is connected to the second grouting steel bar 4-4, a second grouting channel 4-5 is opened in the second grouting steel bar 4-4, the second grouting channel 4-5 is communicated with the second cavity 4-3, the second grouting channel 4-5 is filled with agent B of AB anchor glue, and the second grouting steel bar 4-4 is covered with a second grouting cover 4-6 communicated with the second grouting channel 4-5.

[0056] To further optimize the solution, a second one-way valve 4-7 is provided at the node where the second cavity 4-3 and the second grouting channel 4-5 are connected.

[0057] The principle of the second spraying unit 4 is the same as that of the first spraying unit 3, and will not be repeated here.

[0058] Furthermore, the first slurry stopper 3-2 and the second slurry stopper 4-2 are preferably of a conical structure.

[0059] In a further optimized solution, the sliding rheostat 5 includes a sensitive resistor 5-1 and a conductive clip 5-2. Both are fixedly mounted within the inner cavity of the hollow anchor 1, with a sliding connection between the sensitive resistor 5-1 and the conductive clip 5-2. One end of the wire 2 is connected to the conductive clip 5-2 and the other end is connected to the sensitive resistor 5-1. One end of the sliding rheostat 5 is fixed to the rear end of the hollow anchor 1.

[0060] A blind hole is opened in the hollow anchor rod 1 for installing the sensitive resistor 5-1. The front end of the sensitive resistor 5-1 is suspended in the air and can contact the conductive clamp 5-2 at any angle. The conductive clamp 5-2 is fixed to the inside of the hollow anchor rod 1. As the hollow anchor rod 1 deforms, it slides on the sensitive resistor 5-1 to form a sliding rheostat 5. The total resistance of the circuit changes as the hollow anchor rod 1 deforms.

[0061] The conductive clip 5 - 2 in the sliding rheostat 5 slides on the cantilever end of the sensitive resistor 5 - 1 as the hollow anchor rod 1 deforms, thereby changing the resistance value of the sliding rheostat 5 .

[0062] The deformation monitor 6 calculates the overall deformation of the hollow anchor rod 1 by detecting the resistance changes of all sliding rheostats 5 in the hollow anchor rod 1. When the deformation reaches a preset value, the deformation monitor 6 controls the first spraying unit 3 at the tail end of the next hollow anchor rod 1 to spray AB anchor glue.

[0063] It should be noted that the anchored hollow anchor rod 1 deforms with the displacement of the rock, while the unanchored hollow anchor rod 1 is not affected by the displacement of the surrounding rock and does not deform. Therefore, the resistance change measured by the deformation monitor 6 is only caused by the deformation of the anchored hollow anchor rod 1.

[0064] A further optimized solution also includes a nut 8, which is threadedly connected to the hollow anchor rod 1 at the top of the anchor rod device, and a gasket 9 strung on the hollow anchor rod 1 is provided between the nut 8 and the outer edge of the top of the anchor hole 2.

[0065] The nut 8 and the washer 9 are used to fix the anchor device in the anchor hole 2 .

[0066] The present invention also provides a method for using a layered and sequenced anchoring large deformation anchor device, the method comprising the following steps:

[0067] First, the anchor points are selected based on the depth of the anchor hole 2 and the displacement patterns in different radial positions of the surrounding rock. The number of hollow anchor rods 1 is determined based on the anchor points in the anchor hole 2 in the roadway. The anchor rod device is assembled, and several hollow anchor rods 1 of different lengths are selected. The sensitive resistor 5-1, the first shotcrete unit 3 and the second shotcrete unit 4 are installed. AB anchor glue is filled in the first shotcrete unit 3 and the second shotcrete unit 4 respectively, and the anchor rod device is installed in the anchor hole 2.

[0068] The circuit resistance is adjusted by the deformation monitor 6, and the deformation monitor 6 controls the first spraying device 3-1 in the first spraying unit 3 at the top of the anchor hole 2 to spray the AB anchor glue, so that the hollow anchor rod 1 at the front end forms an initial anchor body;

[0069] The deformation monitor 6 calculates the deformation of the hollow anchor rod 1 according to the change in the circuit resistance, and when the preset value is reached, sequentially controls the first spraying units 3 below the initial anchor body to spray out the AB anchor glue, so that the hollow anchor rods 1 above the first spraying unit 3 at the bottom end form a new anchor body;

[0070] When the internal circuit of the anchor device reaches the set maximum resistance, the deformation monitor 6 controls the second spraying unit 4 to spray out the AB anchor glue, so that the several hollow anchor rods 1 above the second spraying unit 4 form the final anchor body, and the entire anchor device is anchored.

[0071] To further optimize the solution, after the resistance of any sliding rheostat 5 in the new anchor body changes, the deformation monitor 6 detects that the deformation of the hollow anchor rod 1 and all the above hollow anchor rods 1 as a whole reaches a preset value. The deformation monitor 6 controls the first grouting unit 3 at the tail end of the next hollow anchor rod 1 to spray AB anchor glue. Specifically, the anchored initial anchor body deforms as the displacement of the surrounding rock increases. The conductive clip 5-2 in the first section of the hollow anchor rod 1 at the tail end of the initial anchor body slides on the sensitive resistor 5-1, and the circuit resistance increases. The deformation monitor 6 is used to trigger the first grouting device 3-1 in the first grouting unit 3 at the tail end of the hollow anchor rod 1 to spray. The remaining first spraying units 3 repeat the above steps until several first spraying units 3 are sprayed in sequence, and finally a new anchor body is formed.

[0072] Furthermore, a plurality of sliding resistors 5, a plurality of first spraying devices 3-1 and a plurality of second spraying devices 4-1 are connected in series via a conductor 7 to form a loop.

[0073] To further optimize the solution, the deformation calculation method includes the following steps:

[0074] In the initial state, the sensitive resistance of the sliding rheostat 5 in the top hollow anchor rod 1 is R 0,i , which is expressed as follows:

[0075] R 0,i =ρL 0,i / S

[0076] Where ρ is the resistivity of the sensitive resistor, L 0,i is the initial sensitive resistor length of the i-th anchor rod, S is the cross-sectional area of ​​the sensitive resistor;

[0077] At time t, the sensitive resistance value R of the sliding rheostat 5 in the top hollow anchor rod 1 is t,i for:

[0078] R t,i =ρL t,i / S

[0079] Among them, L t,i is the sensitive resistor length of the topmost hollow anchor rod 1 at time t;

[0080] By the initial resistance R 0,i and resistance value R at t t,i The single deformation occurring within time t can be calculated as:

[0081] ΔL t,i =L t,i -L 0,i =S(R t,i -R 0,i ) / ρ

[0082] Where, ΔL t,i is the single deformation of the topmost hollow anchor rod 1 within time t.

[0083] Then, the total deformation of the topmost hollow anchor rod 1 and any number of hollow anchor rods 1 below it is:

[0084]

[0085] Wherein, ΔL is the total deformation of a number of hollow anchor rods 1 within time t, that is, the deformation amount.

[0086] For example, assuming that the number of hollow anchor rods 1 is four, the number of first shotcrete units 3 is three, and the number of second shotcrete units 4 is one;

[0087] The total resistance of the loop is adjusted by an external controller to trigger the first shotcrete device 3-1 in the first shotcrete unit 3 to spray, thereby completing the anchoring of the first hollow anchor rod 1 and forming an initial anchor body. At this time, only the first hollow anchor rod 1 bears the deformation load in the area.

[0088] After the first hollow anchor rod 1 is anchored, the loop resistance increases as the solidified initial anchor body deforms, so that when the sliding rheostat 5 in the first hollow anchor rod 1 detects that the set deformation amount has been reached, the first spraying device 3-1 in the second first spraying unit 3 sprays, thereby combining the second hollow anchor rod 1 with the first hollow anchor rod 1 to form a new anchor body;

[0089] After the second hollow anchor rod 1 is anchored to the first hollow anchor rod 1, the loop resistance increases as the newly consolidated anchor section deforms, so that when the sliding rheostat 5 in the second hollow anchor rod 1 detects that the set deformation amount has been reached, the first spraying device 3-1 in the third first spraying unit 3 sprays, thereby combining the third hollow anchor rod 1, the second hollow anchor rod 1 and the first hollow anchor rod 1 to form a new anchor body again;

[0090] After the third hollow anchor rod 1, the second hollow anchor rod 1 and the first hollow anchor rod 1 are anchored, the loop resistance increases as the new anchoring section that has been consolidated deforms. When the sliding rheostat 5 in the third hollow anchor rod 1 detects that the set deformation amount has been reached, the second spraying device 4-1 in the second spraying unit 4 sprays, thereby combining the fourth hollow anchor rod 1, the third hollow anchor rod 1, the second hollow anchor rod 1 and the first hollow anchor rod 1 to form a final anchor body.

[0091] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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 cannot be understood as a limitation on the present invention.

[0092] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A method for using a layered and sequential anchoring large deformation anchor device, characterized in that: The device comprises: A plurality of hollow anchor rods (1), wherein the plurality of hollow anchor rods (1) are connected end to end and arranged in series in an anchor hole (2); a first spraying unit (3) is arranged between two adjacent hollow anchor rods (1); a first spraying device (3-1) is arranged in the first spraying unit (3); a second spraying unit (4) is arranged at one end of the hollow anchor rod (1) at the bottom end of the anchor rod device, which is away from the first spraying unit (3); a second spraying device (4-1) is arranged in the second spraying unit (4); and a sliding rheostat (5) is arranged in the hollow anchor rod (1); A deformation monitor (6), the deformation monitor (6) being arranged outside the anchor hole (2), the deformation monitor (6) being connected to the sliding rheostat (5), the first spraying device (3-1), and the second spraying device (4-1) via a wire (7); The first spraying unit (3) and the second spraying unit (4) are both filled with AB anchoring glue; The first grouting unit (3) comprises a pair of first grouting plugs (3-2), the pair of first grouting plugs (3-2) being connected to the two adjacent hollow anchor rods (1) one by one, a first cavity (3-3) being provided in the first grouting plug (3-2), the first grouting device (3-1) being provided in the first cavity (3-3), and the first cavity (3-3) being filled with the agent A of the AB anchor glue, a first grouting steel bar (3-4) being connected between the pair of first grouting plugs (3-2), a first grouting channel (3-5) being provided in the first grouting steel bar (3-4), both ends of the first grouting channel (3-5) being connected to the pair of first cavities (3-3), the first grouting channel (3-5) being filled with the agent B of the AB anchor glue, and the first grouting steel bar (3-4) being covered with a first grouting cover (3-6) being connected to the first grouting channel (3-5); The method of use comprises the following steps: Determining the number of the hollow anchor rods (1) based on the anchoring points in the anchor hole (2), assembling the anchor rod device, and installing the anchor rod device in the anchor hole (2); The deformation monitor (6) controls the first spraying unit (3) at the top end of the anchor hole (2) to spray the AB anchor glue, so that the hollow anchor rod (1) at the front end forms an initial anchor body; The deformation monitor (6) controls the plurality of first spraying units (3) below the initial anchor body to sequentially spray the AB anchor glue, so that the plurality of hollow anchor rods (1) above the first spraying unit (3) at the bottom end form a new anchor body; The deformation monitor (6) controls the second spraying unit (4) to spray the AB anchor glue, so that the plurality of hollow anchor rods (1) above the second spraying unit (4) form a final anchor body; After the resistance value of any sliding rheostat (5) in the new anchor body changes, when the deformation monitor (6) detects that the deformation of the hollow anchor rod (1) and all the above hollow anchor rods (1) as a whole reaches a preset value, the deformation monitor (6) controls the first spraying unit (3) at the tail end of the next hollow anchor rod (1) to spray the AB anchor glue.

2. The method for using the layered and sequential anchoring large deformation anchor device according to claim 1 is characterized by: A first one-way valve (3-7) is provided at a node where the first cavity (3-3) is connected to the first grouting channel (3-5).

3. The method for using the layered and sequential anchoring large deformation anchor device according to claim 1 is characterized by: The second grouting unit (4) comprises a second grouting stopper (4-2), the second grouting stopper (4-2) being connected to the hollow anchor rod (1), a second cavity (4-3) being provided in the second grouting stopper (4-2), the second cavity (4-3) being provided with the second grouting device (4-1), and the second cavity (4-3) being filled with the agent A of the AB anchor glue, the second grouting stopper (4-2) being connected to a second grouting steel bar (4-4), a second grouting channel (4-5) being provided in the second grouting steel bar (4-4), the second grouting channel (4-5) being communicated with the second cavity (4-3), the second grouting channel (4-5) being filled with the agent B of the AB anchor glue, and the second grouting steel bar (4-4) being covered with a second grouting cover (4-6) being communicated with the second grouting channel (4-5).

4. The method for using the layered and sequential anchoring large deformation anchor device according to claim 3 is characterized by: A second one-way valve (4-7) is provided at a node where the second cavity (4-3) is connected to the second grouting channel (4-5).

5. The method for using the layered and sequential anchoring large deformation anchor device according to claim 1 is characterized in that: The sliding rheostat (5) comprises a sensitive resistor (5-1) and a conductive clamp (5-2); the sensitive resistor (5-1) and the conductive clamp (5-2) are both fixedly mounted in the inner cavity of the hollow anchor rod (1); and the sensitive resistor (5-1) and the conductive clamp (5-2) are in sliding connection.

6. The method for using the layered and sequential anchoring large deformation anchor device according to claim 1 is characterized by: It also includes a nut (8), which is threadedly connected to the hollow anchor rod (1) at the top end of the anchor rod device, and a gasket (9) strung on the hollow anchor rod (1) is provided between the nut (8) and the outer edge of the top opening of the anchor hole (2).

7. The method for using the layered and sequential anchoring large deformation anchor device according to claim 1 is characterized in that: The method for calculating the deformation includes the following steps: In the initial state, the sensitive resistance of the sliding rheostat (5) in the topmost hollow anchor rod (1) is , which is expressed as follows: in, is the resistivity of the sensitive resistor, For the The initial sensitive resistance length of the anchor rod, is the cross-sectional area of ​​the sensitive resistor; exist When the sensitive resistance value of the sliding rheostat (5) in the hollow anchor rod (1) at the top is for: in, The hollow anchor rod (1) at the top is The sensitive resistor length when By initial resistance value and Resistance value Can calculate time The single deformation occurring in is: in, For time The single deformation of the hollow anchor rod (1) at the top end; Then, the total deformation of the topmost hollow anchor rod (1) and any number of the following hollow anchor rods (1) is: in, For time The total deformation of a number of the hollow anchor rods (1) is the deformation.

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