Negative poisson's ratio cable and slope reinforcement monitoring system

Abstract

The application discloses a negative Poisson's ratio anchor cable and a slope reinforcement and monitoring system, and relates to the field of slope protection. The negative Poisson's ratio anchor cable comprises an outer anchoring section, an inner anchoring section, a tensioning section and a measuring assembly. A grouting pipe is sequentially inserted into the middle part of the outer anchoring section and the middle part of the inner anchoring section. The tensioning section is sequentially inserted into the outer anchoring section and the inner anchoring section. The tensioning section comprises a plurality of anchoring bars arranged in parallel. The plurality of anchoring bars are arranged around the outer periphery of the grouting pipe. Each anchoring bar is made of a negative Poisson's ratio material. The outer periphery wall of each anchoring bar is sequentially provided with a flexible conductive film, an insulating layer and a piezoelectric film from inside to outside. The measuring assembly comprises a resistance sensor and a current sensor arranged in the outer anchoring section. The piezoelectric film is electrically connected with the resistance sensor, the current sensor and an external data acquisition and processing assembly. In this way, the tensile bearing capacity is improved, the monitored landslide is reinforced, the disaster resistance of the landslide is effectively improved, and the problem of missed detection is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slope protection, and particularly relates to a negative Poisson's ratio anchor cable and a slope reinforcement monitoring system. BACKGROUND

[0002] Landslide is a common geological disaster, which is a natural phenomenon that the slope slides down along the slope under the action of gravity due to the influence of rainwater soaking, river erosion, earthquake and other factors. The anchor cable is a geotechnical engineering structure widely used in the field of slope support, which forms a tensile connection between the structure and the stable bedrock based on the prestress principle, thereby improving the stability.

[0003] At present, the anchor cable is usually woven by many small steel strands, which will deform and stretch to a certain extent when bearing load, and when the slope deforms greatly, the anchor cable may be broken due to the inability to bear. Moreover, the traditional point sensor usually has a monitoring blind area, and the most dangerous part of the measured object may be missed, which leads to the failure to timely warn the landslide deformation. SUMMARY

[0004] The main purpose of the present application is to provide a negative Poisson's ratio anchor cable and a slope reinforcement monitoring system, which aims to solve the above problems.

[0005] To achieve the above purpose, the present application provides a negative Poisson's ratio anchor cable, which comprises:

[0006] An outer anchoring section for being arranged outside an anchor hole of a slope;

[0007] An inner anchoring section for being arranged inside the anchor hole, and a middle part of the outer anchoring section and a middle part of the inner anchoring section are sequentially provided for inserting a grouting pipe;

[0008] A tensioning section sequentially inserted into the outer anchoring section and the inner anchoring section, the tensioning section comprises a plurality of anchoring bars arranged in parallel, the plurality of anchoring bars are arranged around the outer periphery of the grouting pipe, each anchoring bar is made of a negative Poisson's ratio material, and the outer periphery wall of each anchoring bar is sequentially provided with a flexible conductive film, an insulating layer and a piezoelectric film from inside to outside; and

[0009] A measurement assembly comprising a resistance sensor and a current sensor arranged in the outer anchoring section, the resistance sensor is used for monitoring the resistance of the flexible conductive film, the current sensor is used for monitoring the current of the piezoelectric film, and the piezoelectric film is electrically connected with the resistance sensor, the current sensor and an external data acquisition and processing assembly.

[0010] Optionally, the negative Poisson's ratio anchor cable further comprises a plurality of positioning rings, the plurality of positioning rings are arranged in the anchor hole and are sleeved on the outer periphery of the tensioning section and are distributed along the extension direction of the tensioning section.

[0011] Optionally, a distance between any two adjacent positioning rings is greater than or equal to 1.5 m and less than or equal to 2 m.

[0012] Optionally, the negative Poisson's ratio anchor cable further comprises an isolation sleeve, which is sleeved outside the free section of the tensioning section.

[0013] Optionally, the outer anchoring section is penetrated by a first grouting hole and a plurality of first steel bar passing holes, the first grouting hole is arranged at the middle part of the outer anchoring section, the plurality of first steel bar passing holes are arranged at the outer periphery of the first grouting hole and are spaced apart along the circumferential direction of the first grouting hole;

[0014] The inner anchoring section comprises an upper bearing plate, a lower bearing plate and a plurality of extrusion sleeves, the lower bearing plate and the upper bearing plate are sequentially and spaced apart along the inner and outer directions of the anchor hole, and the upper bearing plate is penetrated by a second grouting hole at the middle part and a plurality of second steel bar passing holes, and the lower bearing plate is penetrated by a third grouting hole and a plurality of third steel bar passing holes;

[0015] The second grouting hole and the third grouting hole are correspondingly arranged with the first grouting hole and are communicated to form a grouting channel for inserting the grouting pipe;

[0016] The plurality of second steel bar passing holes and the plurality of third steel bar passing holes are correspondingly arranged with the plurality of first steel bar passing holes, the plurality of extrusion sleeves are arranged between the upper bearing plate and the lower bearing plate and are correspondingly arranged with the plurality of second steel bar passing holes of the upper bearing plate, and the corresponding first steel bar passing hole, second steel bar passing hole, extrusion sleeve and third steel bar passing hole are communicated to form an anchoring channel for inserting the anchoring steel bar.

[0017] Optionally, the inner anchoring section further comprises a guide cap, which is arranged on the lower side of the lower bearing plate.

[0018] Optionally, the outer anchoring section comprises a concrete pier, an anchor plate and an anchor device which are sequentially arranged along the inner and outer directions of the anchor hole, and the concrete pier, the anchor plate and the anchor device are respectively penetrated by the first grouting hole and the plurality of first steel bar passing holes.

[0019] The application further provides a slope reinforcement monitoring system, which comprises:

[0020] A plurality of negative Poisson's ratio anchor cables, which are correspondingly installed at a plurality of anchor holes of a slope;

[0021] A grouting assembly, which comprises a material preparation barrel, a grouting pump and a grouting pipe, one end of the grouting pipe is connected with the material preparation barrel through the grouting pump, the other end is connected with a grouting pipe inserted in the negative Poisson's ratio anchor cable, so that the slurry in the material preparation barrel is transported into the anchor hole through the grouting pipe.

[0022] a data collection assembly arranged on the slope, comprising a wind speed measuring device, a weather measuring device and a rainfall measuring device; and

[0023] a data acquisition and processing assembly, comprising a data collector, an early warning device and a data processing terminal, the data collector being electrically connected with the negative Poisson's ratio anchor cable, the data collection assembly and the data processing terminal, so as to acquire monitoring data of the negative Poisson's ratio anchor cable and the data collection assembly, and wirelessly transmit the monitoring data to the data processing terminal for processing, the data processing terminal being electrically connected with the early warning device, so as to control the working state of the early warning device according to the processing result of the data transmitted by the data collector;

[0024] wherein the negative Poisson's ratio anchor cable comprises:

[0025] an outer anchoring section arranged outside an anchor hole of the slope;

[0026] an inner anchoring section arranged inside the anchor hole, a middle part of the outer anchoring section and a middle part of the inner anchoring section being sequentially provided for inserting a grouting pipe;

[0027] a tensioning section sequentially inserted into the outer anchoring section and the inner anchoring section, the tensioning section comprising a plurality of anchoring bars arranged in parallel, the plurality of anchoring bars being arranged around an outer periphery of the grouting pipe, each of the anchoring bars being made of a negative Poisson's ratio material, and an outer periphery wall of each of the anchoring bars being sequentially provided with a flexible conductive film, an insulating layer and a piezoelectric film from inside to outside; and

[0028] a measuring assembly comprising a resistance sensor and a current sensor arranged on the outer anchoring section, the resistance sensor being used for monitoring the resistance of the flexible conductive film, the current sensor being used for monitoring the current of the piezoelectric film, and the piezoelectric film being electrically connected with the resistance sensor, the current sensor and an external data acquisition and processing assembly.

[0029] Optionally, the wind speed measuring device comprises a fan, the fan being electrically connected with the data acquisition and processing assembly, and being used for measuring the wind speed and collecting wind energy to supply power to the data acquisition and processing assembly; and / or

[0030] the weather measuring device comprises a solar panel, the solar panel being electrically connected with the data acquisition and processing assembly, and being used for measuring the weather and collecting solar energy to supply power to the data acquisition and processing assembly; and / or

[0031] the rainfall measuring device comprises a tipping-bucket rain gauge, the tipping-bucket rain gauge being electrically connected with the data acquisition and processing assembly, and being used for measuring the rainfall; and / or

[0032] The warning device includes an audible and visual alarm, which is electrically connected to the data acquisition unit. Optionally, the grouting assembly further includes a pressure regulating valve and a pressure gauge disposed on the grouting pipe, wherein the pressure gauge is used to monitor the grouting pressure, and the pressure regulating valve is used to regulate the grouting pressure.

[0033] In the technical solution of this invention, the anchoring bar is made of a negative Poisson's ratio material. This material expands laterally under uniaxial tension, thereby increasing tensile bearing capacity and providing better response to instantaneous impacts. When a landslide is likely to undergo large deformation, it prevents sudden anchor cable failure, thus reinforcing the monitored landslide and effectively improving its disaster resistance. Furthermore, the outer periphery of each anchoring bar is sequentially provided with a flexible conductive film, an insulating layer, and a piezoelectric film from the inside out. The flexible conductive film has excellent ductility, is sensitive to deformation, has a large strain range, and high resolution and accuracy. Through its specific relationship with strain, it can efficiently monitor the strain at any position of the anchor cable and the degree of landslide deformation, avoiding missed detections and solving the problem of blind spots in traditional point sensors that prevent diversified monitoring. In addition, the measurement information from the measuring component can be transmitted to the data acquisition and processing component for processing through the piezoelectric film. The piezoelectric film can convert mechanical vibration energy into electrical energy, powering electrical equipment and saving power consumption. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0035] Figure 1 A schematic diagram of a structure of an embodiment of the negative Poisson's ratio anchor cable provided by the present invention;

[0036] Figure 2 for Figure 1 A schematic diagram of the tensioning section of a medium-negative Poisson's ratio anchor cable;

[0037] Figure 3 for Figure 1 A partial structural diagram of the inner anchorage section of a medium-negative Poisson's ratio anchor cable;

[0038] Figure 4 for Figure 3 Schematic diagram of the upper bearing plate of the inner anchorage section;

[0039] Figure 5 for Figure 1 A schematic diagram of the positioning ring of a medium-negative Poisson's ratio anchor cable;

[0040] Figure 6 Part structure schematic view of one embodiment of the slope reinforcement monitoring system provided by the present application is shown in the figure.

[0041] Figure 7 Part structure schematic view of one embodiment of the slope reinforcement monitoring system provided by the present application is shown in the figure.

[0042] Explanation of reference numerals:

[0043] Reference Name Reference Name 100 Negative Poisson's ratio anchor cable 42 Current sensor 1 Outer anchoring segment 5 Grouting pipe 11 Concrete pier 6 Positioning ring 12 Anchor plate 7 Isolating sleeve 13 Anchor 200 Grouting assembly 2 Inner anchoring segment 201 Material preparation barrel 21 Upper bearing plate 202 Grouting pump 211 Second grouting hole 203 Grouting pipe 212 Second steel bar hole 204 Pressure regulating valve 22 Lower bearing plate 205 Pressure gauge 221 Third grouting hole 206 Admixture adder 222 Third steel bar hole 207 Agitator 23 Extrusion sleeve 208 Agitator motor 24 Guide cap 300 Data collection assembly 25 Pull rod screw 301 Wind speed measuring device 26 Fastening nut 302 Weather measuring device 3 Tensioning segment 303 Rainfall measuring device 31 Anchoring steel bar 400 Data acquisition and processing assembly 32 Flexible conductive film 401 Data collector 33 Insulating layer 402 Early warning device 34 Piezoelectric film 2000 Slope 4 Measuring assembly 2100 Anchor hole 41 Resistance sensor

[0044] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0046] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0047] In addition, if the embodiments of the present application involve descriptions of “first”, “second”, etc., the descriptions of “first”, “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include at least one of the features. In addition, the meaning of “and / or” appearing throughout the text includes three parallel schemes. Taking “A and / or B” as an example, it includes A scheme, or B scheme, or A and B simultaneously satisfying the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the present application.

[0048] Landslide is a common geological disaster, which is a natural phenomenon that the slope is affected by rainwater soaking, river scouring and earthquake and other factors, and slides down the slope under the action of gravity. Anchor cable is a geotechnical engineering structure widely used in slope support field, which forms a tensile connection between the structure and the stable bedrock based on the prestress principle, thereby improving the stability.

[0049] At present, the anchor cable is usually woven by many small steel strands, which will deform and stretch to a certain extent when bearing load, and when the slope deforms greatly, the anchor cable may be broken due to inability to bear. Moreover, the traditional point sensor usually has a monitoring blind area, and the most dangerous part of the measured object may be missed, which leads to failure to timely warn the landslide deformation.

[0050] In view of this, the present application provides a negative Poisson's ratio anchor cable 100, Figures 1 to 5 An embodiment of the negative Poisson's ratio anchor cable 100 provided by the present application.

[0051] Please refer to Figures 1 to 5 The negative Poisson's ratio anchor cable 100 includes an outer anchoring segment 1, an inner anchoring segment 2, a tensioning segment 3 and a measurement assembly 4. The outer anchoring segment 1 is arranged outside the anchor hole 2100, and the inner anchoring segment 2 is arranged inside the anchor hole 2100. The middle part of the outer anchoring segment 1 and the middle part of the inner anchoring segment 2 are sequentially inserted with a grouting pipe 5. The tensioning segment 3 is sequentially inserted into the outer anchoring segment 1 and the inner anchoring segment 2, and the tensioning segment 3 includes a plurality of anchoring bars 31 arranged in parallel. A plurality of anchoring bars 31 are arranged around the outer periphery of the grouting pipe 5. Each anchoring bar 31 is made of a negative Poisson's ratio material, and the outer periphery wall of each anchoring bar 31 is sequentially provided with a flexible conductive film 32, an insulating layer 33 and a piezoelectric film 34 from inside to outside. The measurement assembly 4 includes a resistance sensor 41 and a current sensor 42 arranged on the outer anchoring segment 1. The resistance sensor 41 is used to monitor the resistance of the flexible conductive film 32, and the current sensor 42 is used to monitor the current of the piezoelectric film 34. The piezoelectric film 34 is electrically connected with the resistance sensor 41, the current sensor 42 and an external data acquisition and processing assembly 400.

[0052] The anchoring rib 31 is made of a negative Poisson's ratio material, which expands laterally under the action of unidirectional tension, thereby improving the tensile bearing capacity and responding to instantaneous impact more optimally. When the landslide may have large deformation, the anchoring rib 31 prevents the anchor cable from suddenly failing, reinforces the monitored landslide, and effectively improves the disaster resistance of the landslide. The outer peripheral wall of each anchoring rib 31 is sequentially provided with a flexible conductive film 32, an insulating layer 33 and a piezoelectric film 34 from inside to outside. The flexible conductive film 32 has excellent ductility, is sensitive to deformation, has a large strain range, high resolution and high accuracy, and can efficiently monitor the strain of any position of the anchor cable and the deformation degree of the landslide through the specific relationship between its resistance and strain, thereby avoiding the problem of missed detection. The measurement information of the measurement assembly 4 can be transmitted to the data acquisition and processing assembly 400 for processing through the piezoelectric film 34, and the piezoelectric film 34 can convert mechanical vibration energy into electrical energy to power the electrical equipment and save the power consumption of the electrical equipment.

[0053] It should be noted that the negative Poisson's ratio material is a material with special mechanical properties, and the Poisson's ratio of the material is negative. The material expands laterally when stretched, and shrinks laterally when compressed. Specifically, the negative Poisson's ratio material is an epoxy material, a fiber-reinforced composite material, a polyurethane foam or a microporous ceramic.

[0054] Specifically, in an embodiment of the present application, the flexible conductive film 32 is made of a flexible colloidal material containing carbon black or graphene, which is uniformly coated on the outer peripheral wall of the anchoring rib 31 by a brushing process.

[0055] Specifically, the insulating layer 33 is prepared by coating the flexible conductive film 32 with an insulating material. Further, the insulating layer 33 is bonded to the piezoelectric film 34.

[0056] Specifically, please refer to Figure 1 and Figure 5 The negative Poisson's ratio anchor cable 100 further comprises a plurality of positioning rings 6, which are arranged in the anchor hole 2100 and sleeved on the tensioning section 3, and are spaced along the extension direction of the tensioning section 3. In this way, the positioning ring 6 is arranged in the anchor hole 2100, so that the tensioning section 3 is centered in the middle of the anchor hole 2100, providing anchoring force.

[0057] Further, the distance between any two adjacent positioning rings 6 is greater than or equal to 1.5 m and less than or equal to 2 m, ensuring that the tensioning section 3 is straight.

[0058] Specifically, please refer to Figure 1The negative Poisson's ratio anchor cable 100 further comprises an isolation sleeve 7, which is sleeved on the free section of the tensioning section 3, so that the free section can move freely during tensioning.

[0059] Specifically, please refer to Figure 3 and Figure 4 The outer anchoring section 1 is provided with a first grouting hole and a plurality of first steel bar passing holes. The first grouting hole is arranged at the middle of the outer anchoring section 1, and the plurality of first steel bar passing holes are arranged at the outer periphery of the first grouting hole and are spaced along the circumferential direction of the first grouting hole. The inner anchoring section 2 comprises an upper bearing plate 21, a lower bearing plate 22, and a plurality of extrusion sleeves 23. The lower bearing plate 22 and the upper bearing plate 21 are sequentially and spaced arranged along the inner and outer directions of the anchor hole 2100. The upper bearing plate 21 is provided with a second grouting hole 211 at the middle and a plurality of second steel bar passing holes 212. The lower bearing plate 22 is provided with a third grouting hole 221 and a plurality of third steel bar passing holes 222. The second grouting hole 211 and the third grouting hole 221 are correspondingly arranged with the first grouting hole and are in communication to form a grouting channel for inserting the grouting pipe 5. The plurality of second steel bar passing holes 212 and the plurality of third steel bar passing holes 222 are correspondingly arranged with the plurality of first steel bar passing holes. The plurality of extrusion sleeves 23 are arranged between the upper bearing plate 21 and the lower bearing plate 22 and are correspondingly arranged with the plurality of second steel bar passing holes 212 of the upper bearing plate 21. The corresponding first steel bar passing hole, second steel bar passing hole 212, extrusion sleeve 23, and third steel bar passing hole 222 are in communication to form an anchoring channel for inserting the anchoring steel bar 31.

[0060] More specifically, please refer to Figure 1 The anchoring steel bar 31 is reserved by 2-3 cm after passing through the lower bearing plate 22 through the third steel bar passing hole 222 to prevent sliding.

[0061] Further, the upper bearing plate 21 and the lower bearing plate 22 are fixedly connected by at least one pull rod screw 25 and at least two fastening nuts 26. The pull rod screw 25 is arranged along the up and down directions through the upper bearing plate 21 and the lower bearing plate 22. The two ends of the pull rod screw 25 are respectively threadedly connected with one fastening nut 26. The upper bearing plate 21 and the lower bearing plate 22 are located between the two fastening nuts 26.

[0062] Further, please refer to Figure 1 The inner anchoring section 2 further comprises a guide cap 25 arranged at the lower side of the lower bearing plate 22. The guide cap can reduce the friction resistance between the negative Poisson's ratio anchor cable 100 and the inner wall of the anchor hole 2100, so that the negative Poisson's ratio anchor cable 100 can be stably placed in the anchor hole 2100.

[0063] Specifically, please refer to Figure 1 , the outer anchoring section 1 includes a concrete pier 11, an anchor plate 12 and an anchor 13 arranged in turn along the inner and outer directions of the anchor hole 2100, the concrete pier 11, the anchor plate 12 and the anchor 13 are respectively penetrated by the first grouting hole and a plurality of first tendon holes. In this way, when the anchor 13 is used to tension and anchor the upper end of the tensioning section 3, the anchor 13 transmits prestress to the anchor plate 12, the anchor plate 12 transmits load to the concrete pier 11, and the concrete pier 11 transmits load to the detected soil, thereby enhancing the stability of the entire structure.

[0064] The application also provides a slope reinforcement monitoring system, please refer to Figure 6 and Figure 7 , the slope reinforcement monitoring system includes a plurality of negative Poisson's ratio anchor cables 100, a grouting assembly 200, a data collection assembly 300, and a data acquisition and processing assembly 400, a plurality of the negative Poisson's ratio anchor cables 100 are installed one by one at a plurality of anchor holes 2100 of the slope 2000; the grouting assembly 200 includes a material preparation barrel 201, a grouting pump 202 and a grouting pipe 203, one end of the grouting pipe 203 is connected with the material preparation barrel 201 through the grouting pump 202, the other end is connected with the grouting pipe 5 inserted in the negative Poisson's ratio anchor cable 100, so that the slurry in the material preparation barrel 201 is delivered to the anchor hole 2100 through the grouting pipe 5; the data collection assembly 300 is arranged on the slope 2000 and includes a wind speed measuring device 301, a weather measuring device 302 and a rainfall measuring device 303; the data acquisition and processing assembly 400 includes a data collector 401, an early warning device 402 and a data processing terminal, the data collector 401 is electrically connected with the negative Poisson's ratio anchor cable 100, the data collection assembly 300 and the data processing terminal, so as to obtain the monitoring data of the negative Poisson's ratio anchor cable 100 and the data collection assembly 300, and wirelessly transmit to the data processing terminal for processing, the data processing terminal is electrically connected with the early warning device 402, so as to control the working state of the early warning device 402 according to the processing result of the data transmitted by the data collector 401.

[0065] In the technical scheme of the present application, the grouting assembly 200 is used to realize grouting of the negative Poisson's ratio anchor cable 100, so that the slurry fills the entire anchor hole 2100, after the slurry solidifies, the tensioning section 3 of the negative Poisson's ratio anchor cable 100 is tensioned by the tensioning equipment, and after prestress is achieved, it is fixed, and the resistance of the flexible conductive film 32 is monitored by the resistance sensor 41 of the negative Poisson's ratio anchor cable 100, the current of the piezoelectric film 34 is monitored by the current sensor 42, the wind speed is measured by the wind speed measuring device 301, the weather is measured by the weather measuring device 302, and the rainfall is measured by the rainfall measuring device 303. The monitoring data obtained by measurement is collected and transmitted to the data processing terminal by the data collector 401 for processing and analysis, and compared with the preset threshold value stored therein, if the preset threshold value is exceeded, the warning device 402 is controlled to issue an alarm, if the preset threshold value is not exceeded, the data is stored and continues to be monitored. In this way, the slope reinforcement monitoring system provided by the present application can establish a visual landslide stress field and strain field, monitor the anchor cable vibration and the rainfall, wind speed and other environmental conditions, comprehensively consider the state of the landslide, and identify the trend of the landslide deformation (such as initial creep and accelerated sliding), and then set a safety threshold to issue an early warning, thereby achieving efficient monitoring and early warning of the landslide deformation.

[0066] It should be noted that the grouting of the negative Poisson's ratio anchor cable 100 uses the grouting of the negative Poisson's ratio anchor cable 100 as described above, that is, the slope reinforcement monitoring system has all the technical features of all the embodiments of the grouting of the negative Poisson's ratio anchor cable 100 described above, and thus has all the technical effects brought by all the technical features described above, which will not be repeated here.

[0067] Further, the wind speed measuring device 301 includes a fan, which is electrically connected with the data collector 401 and the warning device 402, for measuring the wind speed and collecting wind energy to power the data collector 401 and the warning device 402.

[0068] Specifically, the weather measuring device 302 includes a solar panel, which is electrically connected with the data collector 401 and the warning device 402, for measuring the weather and collecting solar energy to power the data collector 401 and the warning device 402.

[0069] Specifically, the rainfall measuring device 303 includes a tipping bucket rain gauge, which is electrically connected with the data collector 401, for measuring the rainfall.

[0070] Specifically, the warning device 402 includes an audible and visual alarm, which is electrically connected with the data collector 401 and the data processing terminal.

[0071] It should be noted that in the present application, the above technical features can be set by one, two or three, or simultaneously. Specifically, in an embodiment of the present application, the above technical features are simultaneously set, that is, the wind speed measuring device 301 comprises a fan, the fan is electrically connected with the data collector 401 and the early warning device 402, for measuring the wind speed and collecting wind energy to power the data collector 401 and the early warning device 402, the weather measuring device 302 comprises a solar panel, the solar panel is electrically connected with the data collector 401 and the early warning device 402, for measuring the weather and collecting solar energy to power the data collector 401 and the early warning device 402, the rainfall measuring device 303 comprises a tipping bucket rain gauge, the tipping bucket rain gauge is electrically connected with the data collector 401, for measuring the rainfall, and the early warning device 402 comprises an audible and visual alarm, the audible and visual alarm is electrically connected with the data collector 401 and the data processing terminal.

[0072] More specifically, please refer to Figure 6 , the data collection assembly 300 further comprises a support rod, the fan is arranged at the top end of the support rod, and the solar panel and the audible and visual alarm are arranged on the side wall of the support rod and below the fan.

[0073] Specifically, please refer to Figure 7 , the grouting assembly 200 further comprises a pressure regulating valve 204 and a pressure gauge 205 arranged on the grouting pipe 203, the pressure gauge 205 is used to monitor the grouting pressure, and the pressure regulating valve 204 is used to adjust the grouting pressure, so that the injection speed of the slurry is controlled through the pressure regulating valve 204 and the pressure gauge 205.

[0074] Further, please refer to Figure 7 , the grouting assembly 200 further comprises an additive feeder 206, a stirrer 207 and a stirring motor 208, the additive feeder 206 is connected with the material barrel 201, and appropriate additives can be added to the material barrel 201 according to the requirements of the site construction, the stirrer 207 is arranged in the material barrel 201, and the stirring motor 208 is drivingly connected with the stirrer 207 to drive the stirrer 207 to stir the slurry in the material barrel 201. In this way, various special slurries can be made according to the requirements of the site construction to meet the engineering needs.

[0075] Further, please refer to Figure 7 , in an embodiment of the present application, the material barrel 201 is cylindrical, and a sealing cover is arranged on the upper cover to prevent the slurry from splashing during stirring.

[0076] The application further provides an assembling method of the slope reinforcement monitoring system, which is suitable for the slope reinforcement monitoring system and specifically comprises the following steps.

[0077] S1, determining the anchor hole position at the construction site.

[0078] S2, drilling the anchor hole and cleaning the sediment in the anchor hole to keep the hole wall clean.

[0079] It should be noted that in this step, the hole depth is generally required to be more than 0.5 m than the designed hole depth.

[0080] S3, preparing the tension section of the negative Poisson's ratio anchor cable.

[0081] In this step, first, the outer peripheral wall of a single negative Poisson's ratio anchoring rib is coated with a flexible conductive film to be cured to form a strain sensing layer, and the resistance value is calibrated to ensure the normal sensing function; then, the insulating material is diluted and uniformly sprayed on the surface of the flexible conductive film to form an insulating layer after curing; finally, the piezoelectric film is attached to the surface of the insulating layer.

[0082] S4: assembling the inner anchoring section of the negative Poisson's ratio anchor cable.

[0083] In this step, first, the lower end of each negative Poisson's ratio anchoring rib sequentially passes through the third rib penetrating hole of the lower bearing plate, the extrusion sleeve and the second rib penetrating hole of the upper bearing plate, and 2-3 cm of each negative Poisson's ratio anchoring rib is reserved at the rear of the lower bearing plate to prevent pulling and sliding; then, the pull rod screw passes through the upper bearing plate and the lower bearing plate, and is fixed with two fastening nuts to fix the upper bearing plate and the lower bearing plate at both ends of the extrusion sleeve; then, the lower side of the lower bearing plate is welded with a guide cap to reduce the friction resistance between the anchor cable and the hole wall and help the negative Poisson's ratio anchor cable to be stably put into the anchor hole; then, a plurality of positioning rings are sleeved on the outer periphery of the tension section, and the interval between two adjacent positioning rings is 1.5-2 m to ensure the straightness of the anchor cable body; then, the grouting pipe sequentially passes through the grouting perforation of the positioning ring, the second grouting hole of the upper bearing plate and the third grouting hole of the lower bearing plate until the lower end of the grouting pipe extends into the guide cap; finally, the isolation sleeve is sleeved on the outer periphery of the free section of the tension section.

[0084] S5, inserting the inner anchoring section of the negative Poisson's ratio anchor cable into the anchor hole.

[0085] S6, preparing the slurry in the preparation barrel by using the grouting equipment.

[0086] In this step, according to the construction requirements on site, special slurry can be prepared by adding additives such as early strength agent and accelerator into the preparation barrel through the additive feeder and stirring by the stirrer.

[0087] S7, grouting into the anchor hole.

[0088] In this step, first, the grouting pipe is connected with the grouting pipe, the grouting pump is powered, grouting is carried out, the grouting speed is controlled through the pressure gauge and the pressure regulating valve, and it is ensured that the slurry fills the entire anchor hole.

[0089] S8, the outer anchoring section of the negative Poisson's ratio anchor cable is assembled, and the anchoring tendon is fixed.

[0090] In this step, first, after the slurry is solidified, a concrete pier is made at the orifice, an anchor plate is installed, the anchoring tendon is tensioned by using a tensioning device, after the prestress is reached, the anchoring tendon is locked by using the anchorage device, and the anchoring tendon is fixed.

[0091] S9, a data collection assembly is arranged.

[0092] In this step, a resistance sensor and a current sensor are installed on the anchor plate, a wind speed measuring device, a weather measuring device and a rainfall measuring device are installed on the slope.

[0093] S10, a data acquisition and processing assembly is arranged.

[0094] In this step, a data collector and an early warning device are installed on the slope, and the data collector and the data processing terminal are wirelessly connected.

[0095] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made under the inventive concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A negative Poisson's ratio cable, characterized by, The negative Poisson's ratio anchor cable comprises: an outer anchoring segment for being arranged outside an anchor hole of a slope; an inner anchoring segment for being arranged inside the anchor hole, a middle part of the outer anchoring segment and a middle part of the inner anchoring segment are sequentially provided for inserting a grouting pipe; a tensioning segment sequentially inserted into the outer anchoring segment and the inner anchoring segment, the tensioning segment comprises a plurality of anchoring bars arranged in parallel, the plurality of anchoring bars are arranged around an outer periphery of the grouting pipe, each of the anchoring bars is made of a negative Poisson's ratio material, and an outer periphery wall of each of the anchoring bars is sequentially provided with a flexible conductive film, an insulating layer and a piezoelectric film from inside to outside; and a measuring assembly comprising a resistance sensor and a current sensor arranged on the outer anchoring segment, the resistance sensor is used for monitoring the resistance of the flexible conductive film, the current sensor is used for monitoring the current of the piezoelectric film, and the piezoelectric film is electrically connected with the resistance sensor, the current sensor and an external data acquisition and processing assembly.

2. The negative Poisson's ratio cable of claim 1, wherein, The negative Poisson's ratio anchor cable further comprises a plurality of positioning rings, the plurality of positioning rings are arranged inside the anchor hole and are sleeved on the outer periphery of the tensioning segment and are spaced along the extension direction of the tensioning segment.

3. The negative Poisson’s ratio cable of claim 2, wherein, The distance between any two adjacent positioning rings is greater than or equal to 1.5 m and less than or equal to 2 m.

4. The negative Poisson’s ratio cable of claim 1, wherein, The negative Poisson's ratio anchor cable further comprises an isolation sleeve, the isolation sleeve is sleeved on the free segment of the tensioning segment.

5. The negative Poisson’s ratio cable of claim 1, wherein, The outer anchoring segment is provided with a first grouting hole and a plurality of first bar holes, the first grouting hole is arranged in the middle part of the outer anchoring segment, the plurality of first bar holes are arranged around the outer periphery of the first grouting hole and are spaced along the circumferential direction of the first grouting hole; The inner anchoring segment comprises an upper bearing plate, a lower bearing plate and a plurality of extrusion sleeves, the lower bearing plate and the upper bearing plate are sequentially and spaced arranged along the inner and outer directions of the anchor hole, the upper bearing plate is provided with a second grouting hole and a plurality of second bar holes in the middle part, and the lower bearing plate is provided with a third grouting hole and a plurality of third bar holes; The second grouting hole and the third grouting hole are respectively arranged corresponding to the first grouting hole and are communicated to form a grouting channel for inserting the grouting pipe; The plurality of second bar holes and the plurality of third bar holes are respectively arranged corresponding to the plurality of first bar holes, the plurality of extrusion sleeves are pressed between the upper bearing plate and the lower bearing plate and are arranged corresponding to the plurality of second bar holes of the upper bearing plate, and the corresponding first bar hole, second bar hole, extrusion sleeve and third bar hole are communicated to form an anchoring channel for inserting the anchoring bar.

6. The negative Poisson’s ratio cable of claim 5, wherein, The inner anchoring segment further comprises a guide cap, the guide cap is arranged on the lower side of the lower bearing plate.

7. The negative Poisson’s ratio cable of claim 5, wherein, The outer anchoring segment comprises a concrete pier, an anchor plate and an anchor device sequentially arranged along the inner and outer directions of the anchor hole, the concrete pier, the anchor plate and the anchor device are respectively provided with the first grouting hole and the plurality of first bar holes.

8. A slope reinforcement monitoring system, characterized by, The slope reinforcement and monitoring system comprises: a plurality of negative Poisson's ratio anchor cables according to any one of claims 1-7, the plurality of negative Poisson's ratio anchor cables are respectively arranged at a plurality of anchor holes of a slope. The grouting assembly comprises a material preparation barrel, a grouting pump and a grouting pipe, one end of the grouting pipe is connected with the material preparation barrel through the grouting pump, and the other end is connected with a grouting pipe inserted in the negative Poisson's ratio anchor cable, so that the slurry in the material preparation barrel is delivered to the anchor hole through the grouting pipe; The data collection assembly is arranged on the slope and comprises a wind speed measuring device, a weather measuring device and a rainfall measuring device; and The data acquisition and processing assembly comprises a data collector, an early warning device and a data processing terminal, the data collector is electrically connected with the negative Poisson's ratio anchor cable, the data collection assembly and the data processing terminal, so as to acquire the monitoring data of the negative Poisson's ratio anchor cable and the data collection assembly, and wirelessly transmit the monitoring data to the data processing terminal for processing, and the data processing terminal is electrically connected with the early warning device, so as to control the working state of the early warning device according to the processing result of the data transmitted by the data collector.

9. The slope reinforcement monitoring system of claim 8, wherein, The wind speed measuring device comprises a fan, the fan is electrically connected with the data collector and the early warning device, and is used for measuring the wind speed and collecting wind energy to supply power to the data collector and the early warning device; and / or The weather measuring device comprises a solar panel, the solar panel is electrically connected with the data collector and the early warning device, and is used for measuring the weather and collecting solar energy to supply power to the data collector and the early warning device; and / or The rainfall measuring device comprises a tipping bucket rain gauge, the tipping bucket rain gauge is electrically connected with the data collector, and is used for measuring the rainfall amount; and / or The early warning device comprises an audible and visual alarm, the audible and visual alarm is electrically connected with the data collector and the data processing terminal.

10. The slope reinforcement monitoring system of claim 8, wherein, The grouting assembly further comprises a pressure regulating valve and a pressure gauge arranged on the grouting pipe, the pressure gauge is used for monitoring the grouting pressure, and the pressure regulating valve is used for adjusting the grouting pressure.

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