A method and device for detecting an anchor head assembly in a safety pressure dispersion anchor cable

Abstract

The present invention belongs to the field of anchor cable detection, and specifically relates to a detection method and device for an anchor head assembly in a safety pressure dispersion anchor cable. The method detects data such as deformation load and its variation range, limit load, deformation amount, and forms no less than three curve correspondences through time, load and deformation amount: a p-s curve, a p-t curve and an s-t curve, etc.; the performance of the assembly is comprehensively evaluated through no less than three curves and measured parameters, and used as a basis for determining the performance of the assembly; compared with the prior art, the present invention can be used as an important basis for evaluating the quality of the assembly product of the anchor cable, and based on these data, the allowable deformation between the sliding P anchor and the fixed P anchor can be reasonably planned, which makes an important contribution to the theoretical design of the assembly product of the anchor cable in different application scenarios, and the measurement method of the present invention is simple and easy to implement.

Description

Technical Field

[0001] The invention belongs to the field of anchor cable detection, and in particular relates to a detection method and device for an anchor head assembly in a safety pressure dispersion anchor cable. Background Art

[0002] Anchor cables are commonly used in the reinforcement of civil engineering projects such as foundation pits and slopes. Ordinary anchor cables usually have no reserved slip design, which leads to the steel strands being easily broken when the structure of the facility changes (earthquakes, landslides, etc.). The anchor head assembly in the safety pressure dispersion anchor cable is designed with a reserved deformation, that is, the allowable deformation between the sliding P anchor and the fixed P anchor. Figure 1 The specific product examples of safe pressure dispersion anchor devices are given in CN203514308U and CN201258485Y. In different application environments, the length and allowable deformation of anchor cables are different. For example, in a slope environment with greater impact resistance, anchor cables with greater allowable deformation are required. In a foundation pit with a narrow environment, anchor cables with shorter length and smaller allowable deformation are required.

[0003] In the prior art, the allowable deformation between the sliding P anchor and the fixed P anchor is still at the stage of subjective experience design, and there is no objective data as the theoretical design basis for the decentralized anchor cable. If the allowable deformation is designed to be too small, it will cause contact between the sliding P anchor and the fixed P anchor when subjected to excessive load, and the steel strand will still be subjected to strong tension and break. Therefore, designing a suitable allowable deformation without affecting the overall length of the anchor cable can provide a scientific basis for the product design of decentralized anchor cables, meet the different load and construction environment requirements of various projects, and ensure that it can maintain stable performance for long-term use.

[0004] Based on this purpose, the present invention measures the deformation load and its variation range, limit load, deformation amount and other data of the anchor head assembly in the safety pressure dispersion anchor cable, and forms a relevant curve; which can serve as an important basis for judging the product performance of the anchor cable assembly. Summary of the invention

[0005] The purpose of the present invention is to provide a method and device for detecting an anchor head assembly in a safe pressure dispersing anchor cable to solve the problems existing in the prior art. To achieve the above-mentioned purpose, the technical solution adopted by the present invention is:

[0006] A method for detecting an anchor head assembly in a safety pressure dispersion anchor cable comprises:

[0007] The first step is to install the inner anchor head assembly of a single safety pressure dispersion anchor cable on the detection device, and connect the steel strand to the tension equipment;

[0008] The second step is to start the tensioning equipment and the steel strand is subjected to tension until it breaks;

[0009] The third step is to record the tension value of the tension device, and the detection device measures the change in the distance between the sliding P anchor and the fixed P anchor;

[0010] Step 4: When the steel strand and the sliding P anchor produce relative displacement, until the sliding P anchor contacts the fixed P anchor, the tensile force value of the relative displacement between the steel strand and the sliding P anchor is used as the deformation load and its variation range is recorded; the tensile force value when the steel strand breaks is used as the limit load; the distance change between the sliding P anchor and the fixed P anchor is used as the deformation;

[0011] Step 5: If the deformation is less than the maximum set threshold, or the detection value interval of the deformation load exceeds ±10% of the deformation rated load, or the limit load is less than the standard value of the limit load of the raw material of the steel strand, then the root assembly does not meet the requirements;

[0012] The sixth step is to form no less than three curve correspondences for the test process of the assembly through time, load and deformation: PS curve, PT curve and ST curve; where P is load, T is time, and S is displacement; the performance of the assembly is comprehensively evaluated through the curves, and used as the basis for determining the performance of the assembly.

[0013] A detection device for an anchor head assembly in a safety pressure dispersion anchor cable comprises a base, a barrier component and a sliding component; the barrier component and the sliding component are mounted on the base; one end of a steel strand passes through the barrier component and is connected to a tension device, a sliding P anchor abuts against the barrier component, the sliding component is connected to the fixed P anchor, and the sliding component is connected to a sliding ruler to measure the change in distance between the sliding P anchor and the fixed P anchor.

[0014] Furthermore, the blocking component includes a force-bearing plate and a connecting sleeve, one side of the force-bearing plate is fixedly connected to the connecting sleeve, the connecting sleeve is sleeved on the sliding P anchor, the interior of the connecting sleeve is a stepped structure for abutting the end of the sliding P anchor, and the steel strand passes through the connecting sleeve and the force-bearing plate.

[0015] Further, the connecting sleeve is fixedly connected to the first support plate at one side away from the force-bearing plate, the top of the first support plate is detachably connected to the first mounting plate, the first support plate and the first mounting plate are both semicircular structures, and the two together form a circular hole through which the sliding P anchor passes, and the top of the first mounting plate is fixedly connected to the first limit plate;

[0016] The top of the sliding component is connected to a connecting rod, and the connecting rod can slidably pass through the first limiting plate. The connecting rod is connected to the sliding ruler through a distance magnification mechanism to magnify the movement stroke of the sliding ruler.

[0017] Further, the distance magnification mechanism includes a driving gear, a driven gear and a bracket, the bracket is mounted on the top of the connecting sleeve, the driving gear and the driven gear are rotatably connected to the bracket, the driving gear meshes with the driven gear, the bottom of the connecting rod and the top of the sliding ruler are respectively provided with rack parts, the rack part of the connecting rod meshes with the driving gear, and the rack part of the sliding ruler meshes with the driven gear;

[0018] The diameter of the driving gear is larger than that of the driven gear.

[0019] Furthermore, the sliding component includes a second supporting plate, a second mounting plate and a second limiting plate;

[0020] The top of the second supporting plate is detachably connected to the second mounting plate, and the second mounting plate and the side opposite to the second supporting plate jointly form a limiting step hole, and the limiting step hole is sleeved on the end of the fixed P anchor away from the sliding P anchor and abuts against the end of the sliding P anchor; the top of the second mounting plate is fixedly connected to the second limiting plate, and the second limiting plate is detachably connected to the end of the connecting rod.

[0021] Furthermore, the bottom of the second supporting plate can be slidably disposed on the base, and the bottoms of the force-bearing plate and the connecting sleeve can be slidably disposed on the base.

[0022] Furthermore, the side of the force-bearing plate away from the connecting sleeve is fixedly connected to the support column, one end of the support column away from the force-bearing plate abuts against the pressure detection component, the pressure detection component is installed on the fixed plate, and the bottom of the fixed plate is fixedly connected to the base.

[0023] Furthermore, one end of the steel strand passes through the fixed plate and is sleeved with a sliding block, the sliding block is attached to the fixed plate, and the sliding block is fixedly connected to the second scale;

[0024] The second scale is used to measure the elastic travel of the steel strand before the steel strand and the sliding P anchor generate relative displacement.

[0025] The present invention has the following beneficial effects: compared with the prior art, the present invention mainly measures the deformation load and its variation range, limit load, deformation amount and other data of the anchor head assembly in the safety pressure dispersion anchor cable; it can be used as an important basis for evaluating the product quality of the assembly of the anchor cable, and based on these data, the allowable deformation between the sliding P anchor and the fixed P anchor can be reasonably planned, which makes an important contribution to the theoretical design of the assembly product of the anchor cable in different application scenarios, and the measuring method of the present invention is simple and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1This is a product example of a safety pressure dispersion anchor device;

[0027] Figure 2 It is a schematic diagram of the overall structure of the detection device of the anchor head assembly in the safety pressure dispersion anchor cable of the present invention;

[0028] Figure 3 for Figure 2 The enlarged schematic diagram at A in the middle;

[0029] Figure 4 Schematic diagram of the connection relationship between the support plate and the mounting plate. DETAILED DESCRIPTION

[0030] The following will be combined with the attached embodiment of the present invention Figure 1-Figure 4 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0031] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply 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 understood as a limitation on the present invention.

[0032] like Figure 1 , which is a product example diagram of the safety pressure dispersion anchor device tested by the present invention, is a prior art. The sliding P anchor and the fixed P anchor are both fixedly sleeved on the steel strand. When the steel strand is pre-tensioned or the facility structure changes, causing the steel strand to be pulled, the steel strand and the sliding P anchor slide relative to each other, and the sliding P anchor and the fixed P anchor slide relative to each other. The main purpose of the present invention is to detect whether the reserved distance between the sliding P anchor and the fixed P anchor is sufficient when the steel strand is broken under the maximum load, that is, whether the allowable deformation (maximum deformation) between the sliding P anchor and the fixed P anchor meets the requirements.

[0033] A method for detecting an anchor head assembly in a safety pressure dispersion anchor cable comprises:

[0034] The first step is to install the inner anchor head assembly of a single safety pressure dispersion anchor cable on the detection device, and connect the steel strand 3 to the tension equipment;

[0035] The second step is to start the tensioning device, and the steel strand 3 is subjected to tension until it breaks;

[0036] The third step is to record the tension value of the tension device, and the detection device measures the change in the distance between the sliding P anchor 1 and the fixed P anchor 2;

[0037] Step 4: When the steel strand 3 and the sliding P anchor 1 produce relative displacement, until the sliding P anchor 1 contacts the fixed P anchor 2, the tension value of the relative displacement between the steel strand 3 and the sliding P anchor 1 is used as the deformation load and its variation range is recorded; the tension value when the steel strand 3 breaks is used as the limit load; the distance change between the sliding P anchor 1 and the fixed P anchor 2 is used as the deformation;

[0038] Step 5: If the deformation is less than the maximum set threshold, or the detection value interval of the deformation load exceeds ±10% of the deformation rated load, or the limit load is less than the standard value of the limit load of the raw material of the steel strand, then the root assembly does not meet the requirements;

[0039] The sixth step is to form no less than three curve correspondences for the anchor cable test process through time, load and deformation: PS curve, PT curve and ST curve, etc.; where P is load, T is time, and S is displacement; the performance of the assembly is comprehensively evaluated through the curves, and used as the basis for determining the performance of the assembly.

[0040] Among them, the initial distance between the sliding P anchor and the fixed P anchor is the allowable deformation; the maximum setting threshold can be set to a specific value, for example, the allowable deformation is 30 mm, and the setting threshold is 30 mm. Therefore, as long as the maximum deformation between the sliding P anchor 1 and the fixed P anchor 2 is less than 30 mm, the assembly does not meet the requirements.

[0041] Specifically, the curve can be drawn by fitting and averaging; the curve includes a time point-deformation curve, a measured load-deformation curve, and a time point-measured load curve; the curve can reflect the common characteristics of the assembly, so that during the design stage of the assembly, the assembly can be designed by these curve data and detection data. The displacement of the sliding P anchor 1 can be detected by a laser rangefinder or other distance detection equipment, or by the following detection device.

[0042] In addition, in the sixth step, if the depicted curve is smooth when the sliding anchor slides, it means that the corresponding assembly has good sliding stability; if the curve is uneven, changes sharply, and has low correlation, it means that the sliding stability performance of the assembly is poor; if the assembly is judged to meet the requirements in the fifth step, but the curve is not smooth when the sliding anchor slides in the sixth step, it is necessary to comprehensively evaluate the performance of the assembly based on the curve and each tested parameter.

[0043] The inner anchor head assemblies of the safety pressure dispersing anchor cable are taken as a test batch according to the assemblies with the same steel strand, anchor manufacturer, model, specification and processing parameters, and one group is randomly inspected in each batch. The single anchor cable with inner anchor head referred to in the present invention constitutes the inner anchor head assembly. Each group consists of 3 single inner anchor head assemblies of the safety pressure dispersing anchor cable. If 2 of the 3 assemblies do not meet the requirements, the batch of products is judged to be unqualified; if 1 of the 3 assemblies does not meet the requirements, take double the number of samples for re-testing. If there are still some that do not meet the requirements, the batch of products shall be judged to be unqualified.

[0044] The present invention not only provides a method for detecting the anchor head assembly in a safe pressure-dispersing anchor cable, but also can use the data produced by the detection method as a theoretical analysis basis to form a curve relationship between time points, measured loads and deformation amounts, thereby providing a theoretical data basis for assembly design, assembly analysis, etc., to guide the later assembly design and production stages.

[0045] It should be noted that if Figure 1 , a safe pressure dispersion anchor device, including a guide cap, a fastening plate, a sealing cover, a steel carrier, a fastening screw, a sealing tape, a sliding P anchor, a fixed P anchor, a steel strand, and anti-corrosion grease, wherein the inner anchor head assembly is an assembly formed by the steel strand, the sliding P anchor, and the fixed P anchor; the single assembly can also be called a single anchor cable, a single anchor cable with an inner anchor head.

[0046] like Figure 2 A detection device for an anchor head assembly in a safety pressure dispersion anchor cable comprises a base 4, a barrier component and a sliding component; the barrier component and the sliding component are mounted on the base 4; one end of a steel strand 3 passes through the barrier component and is connected to a tension device, a sliding P anchor 1 abuts against the barrier component, the sliding component is connected to the fixed P anchor 2, and the sliding component is connected to a sliding ruler 19 to measure the change in distance between the sliding P anchor 1 and the fixed P anchor 2.

[0047] The tension equipment is a prior art, such as steel strand, wire rope pre-tensioning equipment, steel strand tension testing equipment, through-type jack, hydraulic cylinder with steel strand clamp, etc. The function of the blocking component is to resist the sliding P anchor 1, so that it is constrained and does not move, thereby causing the steel strand 3 and the fixed P anchor 2 to move relative to each other.

[0048] Furthermore, the blocking component includes a force-bearing plate 6 and a connecting sleeve 11, one side of the force-bearing plate 6 is fixedly connected to the connecting sleeve 11, the connecting sleeve 11 is sleeved on the sliding P anchor 1, the interior of the connecting sleeve 11 is a stepped structure for abutting the end of the sliding P anchor 1, and the steel strand 3 passes through the connecting sleeve 11 and the force-bearing plate 6.

[0049] The steel strand 3 and the sliding P anchor 1 form a step structure, so that the sliding P anchor 1 is restrained by the step structure inside the connecting sleeve 11 .

[0050] Further, the connecting sleeve 11 is fixedly connected to the first support plate 12 on one side away from the force-bearing plate 6, and the top of the first support plate 12 is detachably connected to the first mounting plate 13. Both the first support plate 12 and the first mounting plate 13 are semicircular structures, and the two together form a circular hole through which the sliding P anchor 1 passes, and the top of the first mounting plate 13 is fixedly connected to the first limit plate 14;

[0051] The top of the sliding component is connected to a connecting rod 18 , and the connecting rod 18 can slidably pass through the first limiting plate 14 . The connecting rod 18 is connected to the sliding ruler 19 through a distance magnifying mechanism to magnify the movement stroke of the sliding ruler 19 .

[0052] Specifically, the sliding ruler 19 is parallel to the connecting rod 18. During the relative movement of the fixed P anchor 2, the sliding ruler 19 slides, so that the relative movement distance of the fixed P anchor 2 can be obtained by reading the sliding ruler 19. The relative movement distance of the fixed P anchor 2 is the deformation between the fixed P anchor 2 and the sliding P anchor 1.

[0053] like Figure 3 The distance magnification mechanism includes a driving gear 20, a driven gear 21 and a bracket 22, the bracket 22 is mounted on the top of the connecting sleeve 11, the driving and driven gears are rotatably connected to the bracket 22, the driving gear 20 meshes with the driven gear 21, the bottom of the connecting rod 18 and the top of the sliding ruler 19 are respectively provided with rack parts, the rack part of the connecting rod 18 meshes with the driving gear 20, and the rack part of the sliding ruler 19 meshes with the driven gear 21;

[0054] The diameter of the driving gear 20 is larger than that of the driven gear 21 .

[0055] Specifically, the diameter of the driving gear 20 is preferably designed to be an integer multiple of the driven gear 21. Through proportional conversion, the sliding stroke of the connecting rod 18 can be magnified several times and reflected in the sliding stroke of the sliding ruler 19. The advantage of designing this amplification mechanism is that the displacement change of the fixed P anchor 2 can be measured more intuitively and accurately, and the moment when the fixed P anchor 2 starts relative movement can be obtained more accurately.

[0056] Furthermore, the sliding component includes a second supporting plate 15, a second mounting plate 16 and a second limiting plate 17;

[0057] The top of the second supporting plate 15 is detachably connected to the second mounting plate 16, and the second mounting plate 16 and the side opposite to the second supporting plate 15 jointly form a limiting stepped hole, and the limiting stepped hole is sleeved on the end of the fixed P anchor 2 away from the sliding P anchor 1, and abuts against the end of the sliding P anchor 1; the top of the second mounting plate 16 is fixedly connected to the second limiting plate 17, and the second limiting plate 17 is detachably connected to the end of the connecting rod 18.

[0058] Specifically, Figure 4 The first support plate 12 and the second support plate 15 have the same cross-sectional structure, and the first mounting plate 13 and the second mounting plate 16 have the same cross-sectional structure. The difference between the two is that the first support plate 12 and the first mounting plate 13 are located on the sliding P anchor 1, and the second support plate 15 and the second mounting plate 16 jointly form a limiting stepped hole to constrain the end of the fixed P anchor 2.

[0059] The first mounting plate 13 and the second mounting plate 16 are both semicircular structures, and a groove portion 24 is respectively provided at both ends of the two; the second support plate 15 and the second mounting plate 16 are both semicircular structures, and an insert portion 26 is respectively provided at both ends of the two; the insert portion 26 is inserted into the corresponding groove portion 24, and a bolt 25 is provided to pass through the groove portion 24 and the insert portion 26; so as to realize the connection between the first mounting plate 13 and the first support plate 12, the second support plate 15 and the second mounting plate 16.

[0060] Furthermore, the bottom of the second supporting plate 15 is slidably disposed on the base 4 , and the bottoms of the force-bearing plate 6 and the connecting sleeve 11 are slidably disposed on the base 4 .

[0061] Furthermore, the side of the force-bearing plate 6 away from the connecting sleeve 11 is fixedly connected to the support column 7, and the end of the support column 7 away from the force-bearing plate 6 abuts against the pressure detection component 8. The pressure detection component 8 is installed on the fixed plate 5, and the bottom of the fixed plate 5 is fixedly connected to the base 4.

[0062] In the present invention, for the load measurement, the load output by the tension device can be used as the measured load, or it can be measured by the pressure detection component 8, which is a prior art, such as a force sensor. A plurality of support columns 7 are provided to meet the support requirements.

[0063] Furthermore, one end of the steel strand 3 passes through the fixed plate 5 and is sleeved with a sliding block 9, the sliding block 9 is attached to the fixed plate 5, and the sliding block 9 is fixedly connected to the second scale 10;

[0064] The second scale 10 is used to measure the elastic travel of the steel strand 3 before the steel strand 3 and the sliding P anchor 1 generate relative displacement.

[0065] Before the steel strand 3 and the sliding P anchor 1 have relative displacement, the steel strand 3 first undergoes elastic deformation and is stretched, while the fixed P anchor 2 does not move at this time. Therefore, the sliding block 9 drives the second scale 10 to move, and the elastic travel of the steel strand 3 can be measured.

[0066] In addition, with regard to the stroke acquisition of the sliding ruler 19 and the second scale 10, corresponding marking lines can be set on the connecting sleeve 11 and the fixing plate 5 to read the stroke amount. Corresponding photoelectric sensors, displacement sensors, distance sensors, etc. can also be set on the connecting sleeve 11 and the fixing plate 5 to electronically detect the stroke change of the sliding ruler 19 and the second scale 10. And when the sliding ruler 19 just starts to move, the stroke of the second scale 10 at this time is recorded as the elastic stroke of the steel strand.

[0067] Compared with the prior art, the present invention mainly measures the deformation load and its variation range, limit load, deformation, elastic travel of the steel strand before deformation and other data of the anchor head assembly in the safety pressure dispersion anchor cable; it can be used as an important basis for evaluating the product quality of the assembly. Based on these data, the allowable deformation between the sliding P anchor 1 and the fixed P anchor 2 can be reasonably planned, which makes an important contribution to the theoretical design of the assembly product of the anchor cable in different application scenarios, and the measuring method of the present invention is simple and easy.

[0068] The embodiments described above are only descriptions of the preferred modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations, modifications, and substitutions made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for detecting an anchor head assembly in a safety pressure dispersing anchor cable, characterized in that: include: The first step is to install the inner anchor head assembly of a single safety pressure dispersion anchor cable on the detection device, and connect the steel strand (3) to the tension device; The second step is to start the tensioning device, and the steel strand (3) is subjected to tension until it breaks; The third step is to record the tension value of the tension device, and the detection device measures the change in the distance between the sliding P anchor (1) and the fixed P anchor (2); Step 4: When the steel strand (3) and the sliding P anchor (1) generate relative displacement, until the sliding P anchor (1) contacts the fixed P anchor (2), the tension value generated by the relative displacement between the steel strand (3) and the sliding P anchor (1) is used as the deformation load and its variation range is recorded; the tension value when the steel strand (3) breaks is used as the limit load; and the distance change between the sliding P anchor (1) and the fixed P anchor (2) is used as the deformation amount; Step 5: If the deformation is less than the maximum set threshold, or the detection value range of the deformation load exceeds ±10% of the deformation rated load, or the limit load is less than the standard value of the limit load of the raw material of the steel strand, then the root assembly does not meet the requirements; Step 6: Form at least three curve correspondences for the test process of the assembly through time, load and deformation: ps curve, pt curve and st curve; where p is load, t is time and s is displacement; comprehensively evaluate the performance of the assembly through the curves and use them as a basis for determining the performance of the assembly; It comprises a base (4), a blocking component and a sliding component; the blocking component and the sliding component are mounted on the base (4); One end of the steel strand (3) passes through the barrier component and is connected to the tension device, the sliding P anchor (1) abuts against the barrier component, the sliding component is connected to the fixed P anchor (2), and the sliding component is connected to a sliding ruler (19) to measure the change in distance between the sliding P anchor (1) and the fixed P anchor (2).

2. A method for detecting an anchor head assembly in a safety pressure dispersing anchor cable according to claim 1, characterized in that: The blocking component comprises a load-bearing plate (6) and a connecting sleeve (11); one side of the load-bearing plate (6) is fixedly connected to the connecting sleeve (11); the connecting sleeve (11) is sleeved on the sliding P anchor (1); the interior of the connecting sleeve (11) is a stepped structure for abutting against the end of the sliding P anchor (1); and the steel strand (3) passes through the connecting sleeve (11) and the load-bearing plate (6).

3. A method for detecting an anchor head assembly in a safety pressure dispersing anchor cable according to claim 2, characterized in that: The side of the connecting sleeve (11) away from the force-bearing plate (6) is fixedly connected to the first support plate (12); the top of the first support plate (12) is detachably connected to the first mounting plate (13); the first support plate (12) and the first mounting plate (13) are both semicircular structures, and the two together form a circular hole through which the sliding P anchor (1) passes; the top of the first mounting plate (13) is fixedly connected to the first limit plate (14); The top of the sliding component is connected to a connecting rod (18), the connecting rod (18) can slidably pass through the first limit plate (14), and the connecting rod (18) is connected to the sliding ruler (19) via a distance magnification mechanism to magnify the movement stroke of the sliding ruler (19).

4. A method for detecting an anchor head assembly in a safety pressure dispersing anchor cable according to claim 3, characterized in that: The distance magnification mechanism comprises a driving gear (20), a driven gear (21) and a bracket (22), wherein the bracket (22) is mounted on the top of the connecting sleeve (11), the driving gear and the driven gear are rotatably connected to the bracket (22), the driving gear (20) meshes with the driven gear (21), the bottom of the connecting rod (18) and the top of the sliding ruler (19) are respectively provided with rack parts, the rack part of the connecting rod (18) meshes with the driving gear (20), and the rack part of the sliding ruler (19) meshes with the driven gear (21); The diameter of the driving gear (20) is larger than that of the driven gear (21).

5. The method for detecting the anchor head assembly in a safety pressure dispersing anchor cable according to claim 2, characterized in that: The sliding component comprises a second supporting plate (15), a second mounting plate (16) and a second limiting plate (17); The top of the second support plate (15) is detachably connected to the second mounting plate (16); the second mounting plate (16) and the second support plate (15) form a position-limiting stepped hole on a side opposite to the second mounting plate (16); the position-limiting stepped hole is sleeved on an end of the fixed P anchor (2) away from the sliding P anchor (1) and abuts against an end of the sliding P anchor (1); the top of the second mounting plate (16) is fixedly connected to the second position-limiting plate (17); the second position-limiting plate (17) is detachably connected to an end of a connecting rod (18).

6. A method for detecting an anchor head assembly in a safety pressure dispersing anchor cable according to claim 5, characterized in that: The bottom of the second support plate (15) is slidably disposed on the base (4), and the bottoms of the force-bearing plate (6) and the connecting sleeve (11) are slidably disposed on the base (4).

7. A method for detecting an anchor head assembly in a safety pressure dispersing anchor cable according to claim 6, characterized in that: The side of the force-bearing plate (6) away from the connecting sleeve (11) is fixedly connected to the support column (7), and the end of the support column (7) away from the force-bearing plate (6) abuts against the pressure detection component (8). The pressure detection component (8) is mounted on the fixed plate (5), and the bottom of the fixed plate (5) is fixedly connected to the base (4).

8. A method for detecting an anchor head assembly in a safety pressure dispersing anchor cable according to claim 7, characterized in that: One end of the steel strand (3) passes through the fixed plate (5) and is sleeved on a sliding block (9), the sliding block (9) fits the fixed plate (5), and the sliding block (9) is fixedly connected to a second scale (10); The second scale (10) is used to measure the elastic travel of the steel strand (3) before relative displacement occurs between the steel strand (3) and the sliding P anchor (1).

Images