A method for manufacturing a controllable constant resistance deformation anchor

Abstract

A method for manufacturing a controllable constant-resistance deformation anchor includes the following steps: S1, selecting a length of L and a breaking force of F according to the current application scenario. b S1. An anchor body with an outer diameter of R1; S2. A constant pressure deformation sleeve is sleeved on the outside of the anchor body; and the radial load-bearing capacity of the constant pressure deformation sleeve is N, and N < F. b S3. A lock is installed at one end of the anchor body, and the constant pressure deformation sleeve is moved to contact the lock. S4. A ball pad is inserted through the end of the anchor body away from the lock, with the inner diameter of the ball pad at the end away from the lock being R2 and the inner diameter at the end near the lock being R3. The two inner diameters are smoothly transitioned by a guide slope with an angle of α. The constant pressure deformation sleeve has a chamfered surface corresponding to the guide slope. The radial force of the constant pressure deformation sleeve is N, and N < the narrowing force P. S5. A tray is inserted through the end of the anchor body away from the lock, and the tray contacts the end of the ball pad away from the lock. The deformation of the constant pressure deformation sleeve can be controlled under controllable conditions.

Description

Technical Field

[0001] This invention relates to the field of technology, specifically to a method for manufacturing a controllable constant resistance deformation anchor. Background Technology

[0002] In the method of using a novel externally expanding frictional constant resistance energy-absorbing anchor bolt with announcement number CN112922654B, an anchor structure is disclosed. The anchor bolt, by setting an externally expanding elastic ring and a conical nut, can avoid the anchor bolt from being stretched and breaking through external expansion deformation. However, due to the uncertainty of the shape and deformation state of the external expansion, it cannot achieve a constant resistance effect. Moreover, due to its structural characteristics, it is impossible to control its deformation to a certain extent and maintain the energy absorption effect through pre-design. Furthermore, due to the uncontrollability of the crack location and crack state, its deformation range is also unpredictable. Summary of the Invention

[0003] To address the problem of excessive uncontrollable factors in the deformation caused by the aforementioned external expansion method, this invention provides a method for manufacturing a controllable constant resistance deformation anchor.

[0004] The technical solution of this invention is as follows:

[0005] A method for manufacturing a controllable constant-resistance deformation anchor includes the following steps:

[0006] S1. Select a length of L and a breaking force of F based on the current application scenario. b An anchor body with an outer diameter of R1;

[0007] S2. A constant pressure deformation sleeve is fitted onto the outside of the anchor body;

[0008] Furthermore, the radial load-bearing capacity of the constant pressure deformation sleeve is N, and N < F. b ;

[0009] S3. A locking device is installed at one end of the anchor body, and the constant pressure deformation sleeve is moved to contact the locking device;

[0010] S4. The ball pad is passed through the end of the anchor body away from the lock, and the inner diameter of the ball pad at the end away from the lock is R2, and the inner diameter at the end close to the lock is R3, and the two inner diameters are smoothly transitioned by a guide slope with an angle of α.

[0011] The constant pressure deformation sleeve is provided with a chamfered surface corresponding to the guide slope, and the radial force of the constant pressure deformation sleeve is N, where N < the narrowing force P.

[0012] S5. The tray passes through the end of the anchor body away from the lock, and the tray abuts against the end of the ball pad away from the lock.

[0013] The yield force is set by defaulting to F. p And F b =1.2*F p And the above-mentioned contraction force P = F p .

[0014] The method of presetting the constant pressure deformation sleeve specification by narrowing force is as follows: the initial radius R0, the radius r0 after narrowing, and the thickness t of the constant pressure deformation sleeve satisfy the following calculation formula:

[0015] P = -2.2πR0tσ b (1+μcotα)*(1-r0 / R0)(3-2cosα);

[0016] Where σ b denoted as the strength limit of the constant pressure deformation sleeve material, and μ is the coefficient of friction between the constant pressure deformation sleeve and the ball pad.

[0017] To avoid swaying of the anchor body, the initial radius R0 of the constant pressure deformation sleeve is in the range of 1.3*R1 < R0 < 1.4*R1.

[0018] As a preferred embodiment, the formula for calculating the radial load-bearing capacity N is:

[0019]

[0020] Stability coefficient of axially compressed members (determined by referring to a table);

[0021] A: Cross-sectional area of ​​the constant pressure deformation sleeve;

[0022] f: Design value of compressive strength of steel (determined by material, refer to the specification).

[0023] To ensure sufficient radial load-bearing capacity, the formula for calculating the cross-sectional area of ​​the constant-pressure deformation sleeve is:

[0024]

[0025] As a preferred embodiment, λ is the slenderness ratio, and its calculation formula is:

[0026] Based on λ and the yield strength f of the steel, refer to Appendix C of the standard (Table of Stability Coefficients for Axially Compressed Members) to obtain the values. The value is L, which represents the length of the constant pressure deformation sleeve.

[0027] To ensure proper installation and controllable status, R1 < R0 < R2 < R0 + t < R3.

[0028] In order to limit the anchor body, the ball pad is located away from the end of the lock, and its inner wall is provided with a guide sleeve. The initial thickness of the guide sleeve is j, the maximum compressible thickness is k, and j < k + t ≤ R2 - R1.

[0029] To prevent the anchor from bending, the contact surface between the ball pad and the tray is spherical.

[0030] The beneficial effects of this invention are as follows: This invention is a method for manufacturing a controllable constant resistance deformation anchor, which can avoid the breakage of the anchor body by deforming through internal collapse. In the above structure, since the structure of the ball pad is controllable, the shrinkage force of its guide slope and constant pressure deformation sleeve is controllable. Therefore, the inner and outer diameters and length design of the constant pressure deformation sleeve can be controlled according to the preset requirements, thereby achieving the preset effect. Moreover, the process is controllable, the deformation mode is controllable, and the deformation process is controllable. Compared with the external expansion method, various parameters can be preset according to the requirements to achieve the preset effect. Attached Figure Description

[0031] The solutions and advantages of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0032] In the attached diagram:

[0033] Figure 1 The curve diagram after applying constant pressure deformation sleeve in this invention;

[0034] Figure 2 This is a schematic diagram of the structure of the present invention (in its conventional state);

[0035] Figure 3 This is a schematic diagram of the structure of the present invention (after being subjected to force);

[0036] Figure 4 For the present invention Figure 2 Schematic diagram of a partial structure;

[0037] Figure 5 For the present invention Figure 3 Structural diagram;

[0038] The components represented by the various reference numerals in the diagram are:

[0039] 1. Tray; 2. Ball pad; 21. Guide ramp; 3. Guide sleeve; 31. Pressure-bearing part; 4. Constant pressure deformation sleeve; 5. Anchor body; 6. Lock. Detailed Implementation

[0040] Example

[0041] A method for manufacturing a controllable constant-resistance deformation anchor includes the following steps:

[0042] S1. Select a length of L and a breaking force of F based on the current application scenario. b An anchor body 5 with an outer diameter of R1 can be an anchor rod or an anchor cable. The specifications of the anchor body 5 are determined entirely based on the actual application scenario. Therefore, all the above values ​​are preset values. After selecting the corresponding anchor body 5, the specification information can be obtained. It should be noted that the maximum deformation length of the anchor body 5 is less than 20% of the total length. After determining the application specifications of the anchor body 5, the subsequent steps can be carried out.

[0043] S2. A constant pressure deformation sleeve 4 is sleeved on the outside of the anchor body 5;

[0044] Furthermore, the radial load-bearing capacity of the constant pressure deformation sleeve 4 is N, and N < F. b The above method ensures that the constant pressure deformation sleeve 4 can withstand a pressure below the breaking force F under the preset conditions. b Under the condition of deformation, it can protect the structure of the anchor body 5 by deforming in place of the anchor rod. Moreover, its deformation process is the same as that of the anchor body 5, following Hooke's Law. Therefore, it can extend the deformation distance of the original anchor body 5 and complete the protection.

[0045] S3. A locking device 6 is provided at one end of the anchor body 5, and the constant pressure deformation sleeve 4 is moved to contact the locking device 6. By setting the locking device 6, the constant pressure deformation sleeve 4 can be pressed against and the stress can be transmitted. The locking device 6 is generally a latch or nut structure. Since its structure is a conventional means, it will not be described in detail.

[0046] S4. After step S3, the ball pad 2 is passed through the end of the anchor body 5 away from the lock 6. The inner diameter of the ball pad 2 away from the lock 6 is R2, and the inner diameter of the end close to the lock is R3. The two inner diameters are smoothly connected by a guide slope 21 with an angle of α. By setting the guide slope 21, a narrowing force can be provided, which can cause the constant pressure deformation sleeve 4 to undergo plastic deformation.

[0047] Therefore, the constant pressure deformation sleeve 4 is provided with a chamfered surface corresponding to the guide slope 21. The radial force of the constant pressure deformation sleeve 4 is N, and N < the narrowing force P. In this way, it can be ensured that after the constant pressure deformation sleeve 4 is compressed, it can achieve narrowing through the above method, and after narrowing, it can deform. During the deformation process, the constant pressure deformation sleeve 4 can deform simultaneously with the anchor body 5 and follow Hooke's law, thereby achieving different feedback effects under different stresses. After the above feedback, it can have a larger deformation stroke than the original anchor body 5, thereby obtaining a better protection effect.

[0048] The method of presetting the specifications of the constant pressure deformation sleeve 4 by means of the necking force is such that the initial radius R0, the radius r0 after necking, and the thickness t of the constant pressure deformation sleeve 4 satisfy the following calculation formula:

[0049] P = -2.2πR0tσ b (1+μcotα)*(1-r0 / R0)(3-2cosα);

[0050] Where σ b denoted as the strength limit of the constant pressure deformation sleeve 4 material, and μ as the friction coefficient between the constant pressure deformation sleeve 4 and the ball pad 2. Except for the specification value of the constant pressure deformation sleeve 4, all other values ​​can be directly obtained or preset. Therefore, it is only necessary to substitute the specification of the constant pressure deformation sleeve 4 to be installed into the above formula and calculate to find out whether its specification meets the requirements. If it meets the requirements, it can be used. If it does not meet the requirements, it cannot be used and its specification needs to be changed until it meets the requirements.

[0051] Furthermore, as a preferred embodiment, the formula for calculating the radial load-bearing capacity N is:

[0052]

[0053] Stability coefficient of axially compressed members (determined by referring to a table);

[0054] A: Cross-sectional area of ​​constant pressure deformation sleeve 4;

[0055] f: Design value of compressive strength of steel (determined by material, refer to the specification).

[0056] To ensure sufficient radial load-bearing capacity, the formula for calculating the cross-sectional area of ​​the constant-pressure deformation sleeve is as follows:

[0057]

[0058] As a preferred embodiment, λ is the slenderness ratio, and its calculation formula is:

[0059] Based on λ and the yield strength f of the steel, refer to Appendix C of the standard (Table of Stability Coefficients for Axially Compressed Members) to obtain the values. The numerical value, L, represents the length of the constant pressure deformation sleeve 4. By substituting the vertical specifications of the constant pressure deformation sleeve 4 into the above formula and comparing them, the structure can be obtained. This allows determination of whether the specifications meet the requirements. Figure 1As shown in the figure, the requirements are met, and its curve is as shown in the figure. It can deform under different stress conditions and can provide constant resistance to avoid damage to the anchor body 5. However, the constant pressure deformation sleeve 4 also has an upper limit to deformation. When it completely collapses and the ball pad 2 comes into contact with the lock 6, it will not be able to play a role. If the stress continues to increase, the anchor body 5 will still be damaged. However, in this process, the anchor body 5 can be protected by the constant pressure deformation sleeve 4. In addition, the design of the constant pressure deformation sleeve 4 is not limited to a few fixed specifications. Since the anchor body 5 is freely designed according to the environment, after meeting the corresponding design requirements, it can be substituted into the above formula and calculated and compared. As long as it meets the conditions, it can be applied. After application, it can protect the anchor body 5.

[0060] To facilitate installation, and to ensure proper installation and controllable status in the above structure, R1 < R0 < R2 < R0 + t < R3. This method facilitates the installation and use of each structure and ensures that each structure is in the preset position, preventing installation failures or overlapping installation positions.

[0061] Subsequently, in order to limit the anchor body 5, the ball pad 2 is located away from the end of the lock 6, and a guide sleeve 3 is provided on its inner wall. The initial thickness of the guide sleeve 3 is j, the maximum compressible thickness is k, and j < k + t ≤ R2 - R1. Through the above setting method, the situation where the constant pressure deformation sleeve 4 cannot shrink normally can be avoided.

[0062] S5. The tray is penetrated through the end of the anchor body 5 away from the lock 6, and the tray abuts against the end of the ball pad 2 away from the lock 6. Finally, in order to avoid bending of the anchor, the contact surface between the ball pad 2 and the tray is a spherical surface.

[0063] Furthermore, as a preferred embodiment, the yield force is set by pre-setting the yield force to F. p And F b =1.2*F p And the above-mentioned contraction force P = F p The yield force, constriction force and radial load-bearing force mentioned above can all be within a range, that is, within a range of 10% up and down, which facilitates the design of constant pressure deformation sleeve 4.

[0064] Finally, it should be noted that in order to avoid the swaying of the anchor body 5, the initial radius R0 of the constant pressure deformation sleeve 4 is in the range of 1.3*R1<R0<1.4*R1.

Claims

1. A method for manufacturing a controllable constant-resistance deformation anchor, characterized in that, Includes the following steps: S1. Select a length of L and a breaking force based on the current application scenario. The outer diameter is The anchor body; S2. A constant pressure deformation sleeve is fitted onto the outside of the anchor body; Furthermore, the radial load-bearing capacity of the constant pressure deformation sleeve is N, and N < ; S3. A locking device is installed at one end of the anchor body, and the constant pressure deformation sleeve is moved to contact the locking device; S4. The ball pad is passed through the end of the anchor body away from the lock, and the inner diameter of the ball pad at the end away from the lock is... The inner diameter of the end closest to the lock is Furthermore, the two inner diameters are smoothly transitioned by a guide ramp with an angle of α; The constant pressure deformation sleeve is provided with a chamfered surface corresponding to the guide slope. The radial load-bearing capacity of the constant pressure deformation sleeve is N, and N < the narrowing force P. S5. The tray passes through the end of the anchor body away from the lock, and the tray abuts against the end of the ball pad away from the lock; Preset yield strength is ,and =1.2* And the above-mentioned contraction force P= ; The initial radius of the constant pressure deformation sleeve Radius after narrowing The thickness t of the constant pressure deformation sleeve satisfies the following calculation formula: ； The formula for calculating the radial load-bearing capacity N is: ； Stability coefficient of axially compressed members; A: Cross-sectional area of ​​the constant pressure deformation sleeve; f: Design value of compressive strength of steel; The formula for calculating the cross-sectional area of ​​a constant pressure deformation sleeve is: ； Let be the slenderness ratio, and its calculation formula is: ,according to Given the yield strength f of the steel, refer to the table of stability coefficients for axially compressed members to obtain... The value L represents the length of the constant pressure deformation sleeve. The ball pad, located away from the lock, has a guide sleeve on its inner wall. The guide sleeve has an initial thickness of j and a maximum compressible thickness of k, where j < k + t ≤ - ; in The strength limit of the constant pressure deformation sleeve material, The coefficient of friction between the constant pressure deformation sleeve and the ball pad is denoted as .

2. The method for manufacturing a controllable constant resistance deformation anchor according to claim 1, characterized in that, The initial radius of the constant pressure deformation sleeve The interval is 1.3* < <1.4* .

3. The method for manufacturing a controllable constant resistance deformation anchor according to claim 1, characterized in that, ＜ ＜ ＜ +t＜ 。 4. The method for manufacturing a controllable constant resistance deformation anchor according to claim 1, characterized in that, The contact surface between the ball pad and the tray is spherical.

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