A prestressed pipe pile monitoring device and method based on capacitance principle

Abstract

The present application relates to a prestressed pipe pile monitoring device and method based on the capacitance principle, which belongs to the field of foundation treatment technology and solves the problem that the prior art cannot accurately detect the penetration of the prestressed pipe pile each time it is hammered. The prestressed pipe pile monitoring device includes: a support platform; a support rod extending along a first direction, the support rod including a fixed portion and a telescopic portion, the telescopic portion telescopes along the first direction, and the fixed portion is fixedly connected to the support platform; a first sensor component, connected to the telescopic portion; a suspension component connected to the telescopic portion, and located on the side of the first sensor component away from the support platform along the first direction; at least part of the suspension component extends along the second direction; the first direction and the second direction are perpendicular; the suspension component includes a lifting portion, which is movably arranged along the first direction; the second sensor component is connected to the lifting portion, and the first sensor component and the second sensor component are spaced apart along the second direction. The present application can accurately detect the penetration of the prestressed pipe pile each time it is hammered.

Description

Technical Field

[0001] The present application relates to the technical field of foundation treatment, and in particular to a prestressed pipe pile monitoring device and method based on the capacitance principle. Background Art

[0002] With the rapid development of my country's transportation infrastructure, the construction sites involved often extend to soft soil areas such as saturated soft loess and land reclamation from the sea. In order to improve the bearing capacity of soft soil foundations and create greater economic and social benefits, the prestressed high-strength concrete (PHC) pipe pile method can be used to reinforce soft soil foundations to form composite foundations. Due to its simple pile-forming process and short construction period during the construction process, it is deeply favored by engineering builders.

[0003] At present, the construction of PHC piles mainly adopts two methods: hammering and static pressure. Hammering construction refers to the use of diesel pile drivers and other corresponding equipment, selecting a certain hammer weight and drop distance, and penetrating the pile into the soil through the energy of the drop hammer. This method is convenient to construct, and the vibration caused by the hammer can compact the soil around the pile. The key to construction is to control the elevation and penetration, and the pile top elevation and the final penetration are used as the final hammer closing standard. In order to prevent the prestressed piles from breaking and bursting during the hammering process, combined with the relevant standards of prestressed piles in the "Technical Specifications for Building Pile Foundations" JGJ94-2008 and local engineering experience, the standard for closing the hammer is that the final penetration should not be less than 20mm / 10 hits, and the final penetration should be measured three times continuously. When the penetration of each burst decreases gradually and reaches the standard for closing the hammer, the hammer can be closed. The two parameters of hammering number and hammering displacement (i.e. penetration) are important indicators for testing the quality of prestressed piles in actual engineering.

[0004] In the past, in the traditional construction process of prestressed pipe piles, the number of hammering is mostly counted manually. However, manual counting not only has high labor costs, but also often brings errors, and it is impossible to accurately detect the penetration of the prestressed pipe pile at each hammering. In recent years, an intelligent monitoring device for prestressed pipe piles has appeared in the prior art, which includes a roller used to contact the outer contour of the prestressed pipe pile, the roller set is fixed on a horizontally arranged rotating shaft, the rotating shaft is mounted on a U-shaped bracket, and a detection device is fixed on one side of the U-shaped bracket. The detection device is used to detect the displacement and vibration of the roller. However, in the actual monitoring process of this intelligent monitoring device, at the moment of hammering, the roller will separate from the outer wall of the pipe pile under the action of the impact force, and will not always contact the outer wall of the pipe pile. There is an error between the rolling distance of the roller and the actual downward movement distance of the pipe pile, which will lead to inaccurate monitoring results and it is difficult to accurately detect the penetration of the prestressed pipe pile at each hammering. Summary of the invention

[0005] In view of the above analysis, the present application aims to provide a prestressed pipe pile monitoring device and method based on the capacitance principle, so as to solve the problem that the prior art cannot accurately detect the penetration degree of the prestressed pipe pile each time it is hammered.

[0006] The purpose of this application is mainly achieved through the following technical solutions:

[0007] The embodiment of the present application provides a prestressed pipe pile monitoring device based on the capacitance principle, including: a support platform; a support rod extending along a first direction, the support rod including a fixed part and a telescopic part, the telescopic part is telescopic along the first direction, and the fixed part is fixedly connected to the support platform; a first sensor component, connected to the telescopic part; a suspension component is connected to the telescopic part, and is located on the side of the first sensor component away from the support platform along the first direction; at least part of the suspension component extends along a second direction; the first direction and the second direction are perpendicular; the suspension component includes a lifting part, and the lifting part is movably arranged along the first direction; the second sensor component is connected to the lifting part, and the first sensor component and the second sensor component are spaced apart along the second direction.

[0008] According to an embodiment of the present application, the first sensing component includes a first electrode, the first electrode is plate-shaped, and the plane where the first electrode is located is perpendicular to the second direction; the second sensing component includes a second electrode, the second electrode is plate-shaped, and the plane where the second electrode is located is perpendicular to the second direction; the spacing between the first electrode and the second electrode along the second direction is less than or equal to a first preset value; along the second direction, the orthographic projection of the first electrode overlaps with the orthographic projection of the second electrode.

[0009] According to an embodiment of the present application, the second sensor component also includes a connecting part, a connecting belt and a fixing bolt, one end of the connecting belt is fixedly connected to the connecting part, and the other end of the connecting belt passes through the connecting part, so that the connecting belt and the connecting part form a whole surrounding the prestressed pipe pile; the fixing bolt passes through the connecting part and is threadedly connected to the connecting part, and a locking pin is provided between the nut of the fixing bolt and the connecting part.

[0010] According to an embodiment of the present application, the second sensing component also includes a damping mechanism, and the damping structure includes a damping shell, a damping part, and a transition part; the damping shell is fixedly connected to the connecting part, part of the transition part is located in the damping shell, and part of the transition part is located in the damping shell; the damping part is arranged in the damping shell and is in contact with the transition part; the second electrode is fixedly connected to the transition part; the damping part includes at least two elastic parts, and the at least two elastic parts are respectively connected to the two sides of the transition part along the first direction, and the elastic parts are all in a compressed or stretched state.

[0011] According to an embodiment of the present application, the first electrodes and the second electrodes are arranged in pairs, and the number is at least four pairs; the second electrodes are evenly distributed along the extension direction of the connecting strip, and at least two second electrodes are arranged along the second direction.

[0012] According to an embodiment of the present application, the telescopic part includes a rod body and a connecting ring, the rod body extends along a first direction and is movably arranged along the first direction; the connecting ring surrounds the second sensor component and is connected to the middle part of the rod body, a plurality of first electrodes are evenly distributed along the extension direction of the connecting ring, and at least two first electrodes are arranged along the second direction.

[0013] According to an embodiment of the present application, it also includes a first signal line, a second signal line and a host; the first signal line is electrically connected to the first electrode, the second signal line is electrically connected to the second electrode, and the first signal line and the second signal line are both electrically connected to the host.

[0014] According to an embodiment of the present application, the suspension assembly includes: a cantilever extending along the second direction and fixedly connected to one end of the telescopic part away from the supporting platform; a pulley block connected to the cantilever; and a sling passing through the pulley block and connected to the lifting part.

[0015] According to an embodiment of the present application, the supporting platform has a clearance gap, and along the first direction, the orthographic projection of the clearance gap overlaps with the orthographic projection of the second sensor component.

[0016] The embodiment of the present application also provides a prestressed pipe pile monitoring method based on the capacitance principle, using the prestressed pipe pile monitoring device based on the capacitance principle of the aforementioned embodiment of the present application.

[0017] Compared with the prior art, in the prestressed pipe pile monitoring device and method based on the capacitance principle provided by the present application, the support platform can provide stable support, the telescopic part of the support rod can be telescopic along the first direction, synchronously driving the suspension assembly and the first sensor assembly to move along the first direction, and the suspension assembly can move the lifting part along the first direction, so that the second sensor assembly moves along the first direction. When using the prestressed pipe pile monitoring device based on the capacitance principle of the embodiment of the present application, the suspension assembly adjusts the position of the second sensor assembly, connects the second sensor assembly to the measured pipe pile, and then relaxes the suspension assembly so that the second sensor assembly can move with the measured pipe pile. When hammering the measured pipe pile, the measured pipe pile penetrates a certain distance into the ground, and the parameters of the second sensor assembly can reflect the actual penetration distance. At the same time, the telescopic part shortens the preset penetration distance, and the first sensor assembly can reflect the preset penetration distance. By comparing the first sensor assembly and the second sensor assembly, the error between the actual penetration distance and the preset penetration distance can be judged, thereby adjusting the process of hammering the measured pipe pile next time.

[0018] In the present application, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present application will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not considered to be limiting of the present application. In the entire drawings, the same reference symbols represent the same components;

[0020] Figure 1 A schematic diagram of the structure of a prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a use of a prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application;

[0022] Figure 3 A schematic diagram of a prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application;

[0023] Figure 4 Another schematic diagram of the principle of the prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application;

[0024] Figure 5 A structural schematic diagram of a second sensor component of a prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application;

[0025] Figure 6 Another structural schematic diagram of the second sensor component of the prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application;

[0026] Figure 7 Another structural schematic diagram of the prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application;

[0027] Figure 8 Another schematic diagram of the principle of the prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application;

[0028] Fig. 9 Another schematic diagram of the principle of the prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application;

[0029] Fig.10 Another structural schematic diagram of the second sensor component of the prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application;

[0030] Fig.11 A schematic diagram of a circuit structure of a prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application.

[0031] Reference numerals:

[0032] 1. Support platform;

[0033] 2. Support rod; 21. Fixed part; 22. Telescopic part; 221. Rod body; 222. Connecting ring;

[0034] 3. a first sensing component; 31. a first electrode;

[0035] 4. Suspension assembly; 41. Lifting unit; 42. Cantilever; 43. Pulley block; 44. Sling;

[0036] 5. Second sensor assembly; 51. Second electrode; 52a. Connecting portion; 52b. Connecting belt; 53. Fixing bolt; 54. Damping mechanism; 541. Damping housing; 542. Damping portion; 543. Adapter;

[0037] 6. Host; 61. First signal line; 62. Second signal line;

[0038] 7. Tested pipe pile;

[0039] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present application are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present application to illustrate the principles of the present application, and are not used to limit the scope of the present application.

[0041] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the term "connected" should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral connection can be a mechanical connection, or an electrical connection can be a direct connection, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] The terms "top", "bottom", "above", "lower", and "on" used throughout the description are relative to the relative positions of components of a device, such as the relative positions of the top and bottom substrates within a device. It is understood that devices are multifunctional regardless of their orientation in space.

[0043] The applicant discovered that when hammering pipe piles, the hammering process needs to be adjusted according to the actual penetration distance of the hammering. Usually, the number of hammering is recorded manually, and after several hammerings, the penetration distance is detected to adjust the subsequent hammering process, and it can also be judged whether to end the hammering construction. However, this manual recording method will not only cause monitoring errors, but also consume a lot of manpower and material resources, and at the same time affect the construction efficiency and increase the construction cost. The intelligent monitoring device using the measurement principle of the roller rolling contact with the outer wall of the pipe pile in the prior art, in the actual monitoring process, at the moment of hammering, the roller will be separated from the outer wall of the pipe pile under the action of the impact force, thereby causing monitoring errors.

[0044] In view of the above analysis, the applicant has proposed a prestressed pipe pile monitoring device and method based on the capacitance principle, including a support platform, a support rod, a first sensor assembly, a suspension assembly, and a second sensor assembly. The support platform can provide stable support, and the telescopic portion of the support rod can be telescopic along a first direction, synchronously driving the suspension assembly and the first sensor assembly to move along the first direction, and the suspension assembly can move the lifting portion along the first direction, thereby moving the second sensor assembly along the first direction. When using the prestressed pipe pile monitoring device based on the capacitance principle of an embodiment of the present application, the suspension assembly adjusts the position of the second sensor assembly, connects the second sensor assembly to the measured pipe pile, and then relaxes the suspension assembly so that the second sensor assembly can move together with the measured pipe pile. When hammering the measured pipe pile, the measured pipe pile penetrates a certain distance into the ground, and the parameters of the second sensor component can reflect the actual penetration distance. At the same time, the telescopic part shortens the preset penetration distance, and the first sensor component can reflect the preset penetration distance. By comparing the first sensor component and the second sensor component, the error between the actual penetration distance and the preset penetration distance can be determined, thereby adjusting the process of hammering the measured pipe pile next time, thereby realizing real-time and accurate monitoring of the hammering process.

[0045] Figure 1 A structural schematic diagram of a prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application. Figure 2 A schematic diagram of the use of a prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application.

[0046] See also Figure 1 and Figure 2The present application proposes a prestressed pipe pile monitoring device based on the capacitance principle, comprising: a support platform 1; a support rod 2 extending along a first direction X, the support rod 2 comprising a fixed portion 21 and a telescopic portion 22, the telescopic portion 22 telescopes along the first direction X, and the fixed portion 21 is fixedly connected to the support platform 1; a first sensor component 3 connected to the telescopic portion 22; a suspension component 4 connected to the telescopic portion 22 and located on a side of the first sensor component 3 away from the support platform 1 along the first direction X; at least part of the suspension component 4 extends along a second direction Y; the first direction X and the second direction Y are perpendicular; the suspension component 4 comprises a lifting portion 41, and the lifting portion 41 is movably arranged along the first direction X; a second sensor component 5 connected to the lifting portion 41, and the first sensor component 3 and the second sensor component 5 are spaced apart along the second direction Y.

[0047] The support platform 1 can provide support for other components of the prestressed pipe pile monitoring device based on the capacitance principle of the embodiment of the present application, and can be directly fixed on the ground in actual use. In order to provide more stable support, the support platform 1 can be provided with a seismic isolation structure to reduce the interference of vibration, and a leveling structure can also be provided to keep the support platform 1 horizontal. It can be understood that when the support platform 1 is kept horizontal, the first direction X can be a vertical direction, and the second direction Y can be a horizontal direction.

[0048] The support rod 2 extends along the first direction X, and the telescopic portion 22 of the support rod 2 can be telescoped along the first direction X. At the same time, the first sensor assembly 3 is connected to the telescopic portion 22, so that the first sensor assembly 3 can move together with the telescopic portion 22 along the first direction X. In the process of using the prestressed pipe pile monitoring device based on the capacitance principle of the embodiment of the present application, when the measured pipe pile 7 is hammered, the telescopic portion 22 will shorten a certain distance, which is equal to the preset penetration distance of the hammered pipe pile, so that the first sensor assembly 3 can reflect the preset penetration distance.

[0049] The second sensor assembly 5 is fixedly connected to the measured pipe pile 7. When the measured pipe pile 7 is hammered, the second sensor assembly 5 can move with the measured pipe pile 7, so that the second sensor assembly 5 can reflect the actual penetration distance of the measured pipe pile 7. By comparing the detection results of the first sensor assembly 3 and the second sensor assembly 5, the relationship between the actual penetration distance and the preset penetration distance can be determined, thereby obtaining the error of the penetration distance, and then guiding the adjustment of subsequent hammering, so as to achieve accurate and real-time monitoring of the hammering construction process. Exemplarily, the first sensor assembly 3 and the second sensor assembly 5 can each detect the actual penetration distance and the preset penetration distance, and the two can jointly detect the difference between the actual penetration distance and the preset penetration distance.

[0050] The suspension assembly 4 is used to assist in fixing the second sensor assembly 5 and the measured pipe pile 7. The lifting part 41 of the suspension assembly 4 can move along the first direction X. The second sensor assembly 5 is connected to the lifting part 41. By adjusting the position of the lifting part 41, the positions of the first sensor assembly 3 and the second sensor assembly 5 in the first direction X can be basically consistent, thereby making it easier to compare the preset penetration distance corresponding to the first sensor assembly 3 and the actual penetration distance of the second sensor assembly 5.

[0051] Figure 3 A schematic diagram of the principle of a prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application. Figure 4 Another schematic diagram of the principle of the prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application.

[0052] For further information, see Figure 3 and Figure 4 , and combined with Figure 1 , the first sensing component 3 includes a first electrode 31, the first electrode 31 is in a plate shape, and the plane where the first electrode 31 is located is perpendicular to the second direction Y; the second sensing component 5 includes a second electrode 51, the second electrode 51 is in a plate shape, and the plane where the second electrode 51 is located is perpendicular to the second direction Y; the spacing between the first electrode 31 and the second electrode 51 along the second direction Y is less than or equal to a first preset value; along the second direction Y, the orthographic projection of the first electrode 31 overlaps with the orthographic projection of the second electrode 51. Among them, the size parameters of the first electrode 31 and the second electrode 51 can be set according to actual needs, and the attached drawings only show the shapes and relative positional relationship of the two electrodes, and the sizes of the two electrodes in the attached drawings do not represent the sizes in actual applications.

[0053] In the embodiment of the present application, the first sensor component 3 and the second sensor component 5 are used to jointly detect the difference between the actual penetration distance and the preset penetration distance. The first electrode 31 of the first sensor component 3 and the second electrode 51 of the second sensor component 5 can form a parallel plate capacitor. Taking a certain hammering as an example, before the hammering, the capacitance formed by the first electrode 31 and the second electrode 51 is C1, C1=εS1 / (4πkd), where ε is the dielectric constant, S1 is the facing area of ​​the two electrodes, and d is the distance between the two plates. After the first sensor component 3 and the second sensor component 5 are installed, ε and d can be regarded as fixed values. After the hammering, when there is an error between the actual penetration distance and the preset penetration distance, the facing area of ​​the first electrode 31 and the second electrode 51 will be reduced to S2. At this time, the capacitance formed by the first electrode 31 and the second electrode 51 becomes C2, C2=εS2 / (4πkd). Since S1>S2, C1>C2. Therefore, before and after the hammering, by detecting whether the capacitance formed by the first electrode 31 and the second electrode 51 changes, if it changes, the magnitude of the change can be used to determine whether an error occurs between the actual penetration distance and the preset penetration distance, and if an error occurs, the magnitude of the error can be obtained. The spacing between the first electrode 31 and the second electrode 51 along the second direction Y is less than or equal to the first preset value, and the capacitance of the parallel plate capacitor is large enough to facilitate the detection of the capacitance formed by the first electrode 31 and the second electrode 51.

[0054] Figure 5 A structural schematic diagram of a second sensor component of a prestressed pipe pile monitoring device based on the capacitance principle in an embodiment of the present application.

[0055] For further information, see Figure 5 , and combined with Figure 1 The second sensing assembly 5 also includes a connecting portion 52a, a connecting belt 52b and a fixing bolt 53. One end of the connecting belt 52b is fixedly connected to the connecting portion 52a, and the other end of the connecting belt 52b passes through the connecting portion 52a, so that the connecting belt 52b and the connecting portion 52a form a whole surrounding the prestressed pipe pile; the fixing bolt 53 passes through the connecting portion 52a and is threadedly connected to the connecting portion 52a, and a locking pin is provided between the nut of the fixing bolt 53 and the connecting portion 52a.

[0056] The connecting portion 52a and the connecting belt 52b of the second sensor assembly 5 are in the form of a cable tie, which is trapped on the measured pipe pile 7, so that the second sensor assembly 5 is fixed on the measured pipe pile 7. When the measured pipe pile is hammered, the measured pipe pile will be subjected to a large impulse, and the second sensor assembly 5 fixed on the measured pipe pile 7 can move together, reducing the movement of the second sensor assembly 5 on the measured pipe pile 7 due to inertia, thereby improving the accuracy of detection. After the second sensor assembly 5 is fixed on the measured pipe pile 7 through the connecting portion 52a and the connecting belt 52b, the fixing bolt 53 is rotated so that the end of the fixing bolt 53 passes through the inner side of the connecting portion 52a and abuts against the surface of the measured pipe pile 7, thereby tightening the connecting belt 52b, further fixing the measured pipe pile 7 and the second sensor assembly 5, thereby reducing the risk of the second sensor assembly 5 moving on the measured pipe pile due to inertia. Considering that the measured pipe pile and the second sensor assembly 5 will be subjected to large vibrations when hammered, the locking pin can reduce the risk of the fixing bolt 53 rotating in the opposite direction due to vibration.

[0057] Figure 6 Another structural schematic diagram of the second sensor component of the prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application.

[0058] For further information, see Figure 6 , and combined with Figure 1 The second sensor assembly 5 also includes a damping mechanism 54, and the damping structure includes a damping housing 541, a damping part 542, and a transition part 543; the damping housing 541 is fixedly connected to the connecting part 52a, and part of the transition part 543 is located in the damping housing 541, and part of the transition part 543 is located in the damping housing 541; the damping part 542 is arranged in the damping housing 541, and is in contact with the transition part 543; the second electrode 51 is fixedly connected to the transition part 543. The damping part 542 includes at least two elastic members, and the at least two elastic members are respectively connected to the two sides of the transition part 543 along the first direction X, and the elastic members are in a compressed or stretched state.

[0059] When the measured pipe pile is hammered, the measured pipe pile 7 and the second sensor assembly 5 will be subjected to a large impulse, resulting in displacement and violent vibration, which may cause damage to the second sensor assembly 5. The damping mechanism 54 can reduce the acceleration of the second electrode 51 of the second sensor assembly 5, reduce the movement impact of the second sensor assembly 5, and protect the second sensor assembly 5. A part of the adapter 543 is inside the damping shell 541, and a part is outside the damping shell 541, and can move relative to the damping shell 541 along the first direction X. The damping part 542 can generate a force and apply it to the adapter 543 to achieve a damping effect on the second electrode 51.

[0060] In the embodiment of the present application, the damping part 542 is in the form of an elastic member, and the elastic member can be a spring for example. In the damping housing 541, two elastic members are respectively connected to the two sides of the adapter 543 along the first direction X. At this time, the two elastic members are in a compressed or stretched state, and at the same time, an elastic force is applied to the adapter 543 along the first direction X. When the damping housing 541 moves with the measured pipe pile 7, the adapter 543 moves along the first direction X relative to the damping housing 541 under the action of inertia, and the elastic member applies a force gradually increasing from zero to the adapter 543, so that the adapter 543 can move with the damping housing 541; when the measured pipe pile 7 stops moving, the adapter 543 continues to move along the first direction X relative to the damping housing 541 under the action of inertia, and the elastic member applies a force gradually increasing from zero to the adapter 543, so that the adapter 543 can gradually stop moving. Since at least two elastic members are respectively connected to the two sides of the adapter 543 along the first direction X, the relative position of the adapter 543 and the damping shell 541 remains unchanged before and after hammering, so that the displacement of the second electrode 51 connected to the adapter 543 can reflect the actual penetration distance of the measured pipe pile.

[0061] Figure 7 Another structural schematic diagram of a prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application. Figure 8 Another schematic diagram of the principle of the prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application. Fig. 9 Another schematic diagram of the principle of the prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application.

[0062] For further information, see Figures 7 to 9 The first electrodes 31 and the second electrodes 51 are arranged in pairs, and the number is at least four pairs; the second electrodes 51 are evenly distributed along the extension direction of the connecting belt, and at least two second electrodes 15 are arranged along the second direction Y.

[0063] Considering that when the tested pipe pile is hammered, the pipe pile will not completely penetrate the ground along the first direction X and may be slightly tilted, the first electrode 31 and the second electrode 51 may not be parallel, that is, the plane where the second electrode 51 is located forms an acute angle with the first direction X.

[0064] The first electrode 31 and the second electrode 51 are arranged in pairs, and the second electrodes 51 are evenly arranged along the extending direction of the connecting belt 52b, that is, at least four pairs of the first electrodes 31 and the second electrodes 51 are arranged along the circumference of the pipe pile. For the convenience of description, it is taken that two pairs of the first electrodes 31 and the second electrodes 51 are respectively located on both sides of the measured pipe pile 7 along the second direction Y, and the measured pipe pile is inclined toward the second direction Y.

[0065] In the two pairs of first electrodes 31 and second electrodes 51, the plane where the first electrode 31 is located is parallel to the first direction X, and the plane where the second electrode 51 is located is at an acute angle to the first direction X. The distance between the first electrode 31 and the second electrode 51 increases, so the pair of first electrodes 31 and the second electrode 51 form a capacitor C 21 <C2, the distance between the other pair of first electrodes 31 and the second electrode 51 in the two pairs is reduced, so the pair of first electrodes 31 and the second electrode 51 form a capacitor C 21 >C2, where C2 is the capacitance value when no tilt occurs. That is, if the capacitance C formed by the two pairs of first electrodes 31 and second electrodes 51 21 <C 22 , it can be determined that the measured pipe pile 7 is oriented towards C 22 The corresponding first electrode 31 and the second electrode 51 are inclined on one side. Considering that the planes where the two second electrodes 51 are located in the two pairs of first electrodes 31 and the second electrode 51 are parallel, the distance changes between the two pairs of first electrodes 31 and the second electrode 51 are equal, C 21 It can be calculated by d+△d, C 22 It can be calculated by d-△d, where d is the distance between the two plates when there is no tilt, and △d is the change in the distance between the two plates after the tilt. Therefore, when measuring C 21 , C 22 When d and ε are known, the size of △d and S2 (the facing area of ​​the two plates after hammering) can be calculated, and then the difference between the actual penetration distance and the preset penetration distance can be obtained.

[0066] Fig.10 Another structural schematic diagram of the second sensor component of the prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application.

[0067] For further information, see Fig.10 , and combined with Figure 7 The telescopic portion 22 includes a rod body 221 and a connecting ring 222. The rod body 221 extends along the first direction X and is movably arranged along the first direction X; the connecting ring 222 surrounds the second sensor component 5 and is connected to the middle part of the rod body 221. A plurality of first electrodes 31 are evenly distributed along the extension direction of the connecting ring 222, and at least two first electrodes 31 are arranged along the second direction Y.

[0068] The rod body 221 extends along the first direction X, corresponding to the main structure of the telescopic part 22. It can be understood that the maximum stroke of the rod body 221 along the first direction X should be large enough to meet the penetration distance requirement of the hammer. The connecting ring 222 surrounds the second sensor component 5 to provide support for the first sensor component 3. When the rod body 221 moves the preset penetration distance, the connecting ring 222 and the first sensor component 3 move the preset penetration distance, so that the moving distance of the first electrode 31 of the first sensor component 3 is equal to the preset penetration distance. For ease of installation, the connecting ring 222 includes a first half ring and a second half ring, the first half ring is connected to the rod body 221, and the second half ring is detachably connected to the first half ring. When installing the second sensor component 5, the second half ring can be removed first, and after the second sensor component 5 is hoisted, the first half ring and the second half ring are connected to form a whole. Fig.11 A schematic diagram of a circuit structure of a prestressed pipe pile monitoring device based on the capacitance principle according to an embodiment of the present application.

[0069] For further information, see Fig.11 , and combined with Figure 1 The prestressed pipe pile monitoring device based on the capacitance principle of the embodiment of the present application also includes a first signal line 61, a second signal line 62 and a host 6; the first signal line 61 is electrically connected to the first electrode 31, the second signal line 62 is electrically connected to the second electrode 51, and the first signal line 61 and the second signal line 62 are both electrically connected to the host 6.

[0070] The host 6 introduces the detection signal into the first electrode 31 and the second electrode 51 through the first signal line 61 and the second signal line 62. Considering that in the embodiment of the present application, it is necessary to detect the capacitance formed by the first electrode 31 and the second electrode 51, the host 6 can introduce the AC signal into the first signal line 61 and the second signal line 62. At this time, the capacitor C will generate a capacitive reactance X=1 / (2πfC), where f is the frequency of the AC. The detection current can obtain the size of the capacitive reactance X, and then according to the frequency f of the AC, the size of the capacitor C can be obtained. The capacitance C formed by the first electrode 31 and the second electrode 51 is C=εS / (4πkd), and then according to the change of the capacitance C, the change of the area S facing the first electrode 31 and the second electrode 51 is determined, that is, the displacement difference between the first electrode 31 and the second electrode 51 along the first direction X, that is, the difference between the actual penetration distance and the preset penetration distance.

[0071] Further, see Figure 1 The suspension assembly 4 includes: a cantilever 42 extending along the second direction Y and fixedly connected to an end of the telescopic portion 22 away from the supporting platform 1; a pulley block 43 connected to the cantilever 42; and a sling 44 passing through the pulley block 43 and connected to the lifting portion 41.

[0072] The suspension assembly 4 is used to install the second sensor assembly 5. The lifting part 41 is connected to the cantilever 42 through a pulley block 43 and a sling 44. Before the second sensor assembly 5 is connected to the measured pipe pile 7, the sling 44 is adjusted to adjust the position of the lifting part 41 along the first direction X. When the first electrode 31 and the second electrode 51 are substantially facing each other, the position of the lifting part 41 is kept unchanged, and the second sensor assembly 5 is fixed to the measured pipe pile 7. After the second sensor assembly 5 is fixedly connected to the measured pipe pile 7, the sling 44 is loosened to release the connection between the sling 44 and the lifting part 41. When the measured pipe pile 7 is hammered, the lifting part 41 and the second sensor assembly 5 move with the measured pipe pile 7 without being affected by the sling 44. It can be understood that, in order to adjust the center of gravity, a counterweight block can be set on the side of the cantilever 42 away from the pulley block 43 along the second direction Y. Exemplarily, the pulley block 43 can be a single fixed pulley block, or a pulley block 43 formed by a combination of a fixed pulley and a movable pulley.

[0073] Further, see Figure 1 The supporting platform 1 has a clearance gap, and along the first direction X, the orthographic projection of the clearance gap overlaps with the orthographic projection of the second sensing component 5.

[0074] The clearance gap of the support platform 1 is used to make room for the pipe pile 7 to be tested, so that the support rod 2 can be located in the middle of the support platform 1. Considering that the center of gravity of the support rod 2 is relatively high, the risk of tipping over of the prestressed pipe pile monitoring device based on the capacitance principle in the embodiment of the present application can be reduced.

[0075] The present application also provides a prestressed pipe pile monitoring method based on the capacitance principle, using the prestressed pipe pile monitoring device based on the capacitance principle of the aforementioned embodiment of the present application.

[0076] The prestressed pipe pile monitoring method based on the capacitance principle of the embodiment of the present application includes the following steps:

[0077] Step S1, placing the pipe pile 7 to be tested;

[0078] Step S2, hoisting and adjusting the second sensor assembly 5 through the suspension assembly 4 so that the first electrode 31 and the second electrode 51 are directly opposite, fixing the second sensor assembly 5 and the measured pipe pile 7, and releasing the connection between the suspension assembly 4 and the second sensor assembly 5.

[0079] Step S3 , detecting the capacitance C1 between the first electrode 31 and the second electrode 51 .

[0080] Step S4 , hammer the measured pipe pile 7 , and the second sensor assembly 5 moves together with the measured pipe pile 7 .

[0081] Step S5, contract the telescopic portion 22 of the support rod 2, the contraction distance being equal to the preset penetration distance of the measured pipe pile 7, and the first sensor assembly 3 moves together with the telescopic portion.

[0082] Step S6 , after the position of the second electrode 51 is stabilized, the capacitance C2 between the first electrode 31 and the second electrode 51 is detected and calculated.

[0083] Step S7, compare C1 and C2, and calculate the difference between the preset penetration distance and the actual penetration distance, so as to adjust and control the subsequent hammering operation.

[0084] In summary, the embodiments of the present application provide a prestressed pipe pile monitoring device and method based on the capacitance principle, including a support platform, a support rod, a first sensor assembly, a suspension assembly, and a second sensor assembly. The support platform can provide stable support, and the telescopic portion of the support rod can telescope along a first direction, synchronously driving the suspension assembly and the first sensor assembly to move along the first direction, and the suspension assembly can move the lifting portion along the first direction, thereby causing the second sensor assembly to move along the first direction. When using the prestressed pipe pile monitoring device based on the capacitance principle of the embodiments of the present application, the suspension assembly adjusts the position of the second sensor assembly, connects the second sensor assembly to the measured pipe pile, and then releases the suspension assembly so that the second sensor assembly can move together with the measured pipe pile. When hammering the measured pipe pile, the measured pipe pile penetrates a certain distance into the ground, and the parameters of the second sensor component can reflect the actual penetration distance. At the same time, the telescopic part shortens the preset penetration distance, and the first sensor component can reflect the preset penetration distance. By comparing the first sensor component and the second sensor component, the error between the actual penetration distance and the preset penetration distance can be determined, thereby adjusting the process of hammering the measured pipe pile next time, thereby realizing real-time and accurate monitoring of the hammering process.

[0085] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A prestressed pipe pile monitoring device based on the capacitance principle, characterized in that: include: Support platform; A support rod extending along a first direction, the support rod comprising a fixed portion and a telescopic portion, the telescopic portion telescopes along the first direction, and the fixed portion is fixedly connected to the support platform; A first sensor component connected to the telescopic portion; a suspension assembly connected to the telescopic portion and located on a side of the first sensor assembly away from the support platform along the first direction; at least a portion of the suspension assembly extends along a second direction; the first direction is perpendicular to the second direction; the suspension assembly includes a lifting portion, and the lifting portion is movably arranged along the first direction; A second sensor component is connected to the lifting part, and the first sensor component and the second sensor component are arranged at intervals along the second direction; The first sensing component includes a first electrode, and the first electrode is in a plate shape; The second sensing component includes a second electrode, and the second electrode is in a plate shape.

2. The prestressed pipe pile monitoring device based on the capacitance principle according to claim 1 is characterized in that: The plane where the first electrode is located is perpendicular to the second direction, and the plane where the second electrode is located is perpendicular to the second direction; the distance between the first electrode and the second electrode along the second direction is less than or equal to a first preset value; Along the second direction, the orthographic projection of the first electrode overlaps with the orthographic projection of the second electrode.

3. The prestressed pipe pile monitoring device based on the capacitance principle according to claim 1 is characterized in that: The second sensing assembly also includes a connecting portion, a connecting belt and a fixing bolt, one end of the connecting belt is fixedly connected to the connecting portion, and the other end of the connecting belt passes through the connecting portion, so that the connecting belt and the connecting portion form a whole surrounding the prestressed pipe pile; the fixing bolt passes through the connecting portion and is threadedly connected to the connecting portion, and a locking pin is provided between the nut of the fixing bolt and the connecting portion.

4. The prestressed pipe pile monitoring device based on the capacitance principle according to claim 3 is characterized in that: The second sensing component also includes a damping mechanism, which includes a damping shell, a damping part, and a transition part; the damping shell is fixedly connected to the connecting part, and part of the transition part is located in the damping shell; the damping part is arranged in the damping shell and is in contact with the transition part; the second electrode is fixedly connected to the transition part; the damping part includes at least two elastic members, and at least two of the elastic members are respectively connected to the two sides of the transition part along the first direction, and the elastic members are all in a compressed or stretched state.

5. The prestressed pipe pile monitoring device based on the capacitance principle according to claim 3 is characterized in that: The first electrodes and the second electrodes are arranged in pairs, and the number is at least four pairs; the second electrodes are evenly distributed along the extension direction of the connecting strip, and at least two of the second electrodes are arranged along the second direction.

6. The prestressed pipe pile monitoring device based on the capacitance principle according to claim 5 is characterized in that: The telescopic part includes a rod body and a connecting ring, the rod body extends along the first direction and is movably arranged along the first direction; the connecting ring surrounds the second sensing component and is connected to the middle part of the rod body, a plurality of first electrodes are evenly distributed along the extension direction of the connecting ring, and at least two first electrodes are arranged along the second direction.

7. The prestressed pipe pile monitoring device based on the capacitance principle according to claim 1 is characterized in that: It also includes a first signal line, a second signal line and a host; the first signal line is electrically connected to the first electrode, the second signal line is electrically connected to the second electrode, and the first signal line and the second signal line are both electrically connected to the host.

8. The prestressed pipe pile monitoring device based on the capacitance principle according to claim 1 is characterized in that: The suspension assembly comprises: a cantilever extending along the second direction and fixedly connected to an end of the telescopic portion away from the supporting platform; A pulley block connected to the cantilever; A sling passes through the pulley block and is connected to the lifting part.

9. The prestressed pipe pile monitoring device based on the capacitance principle according to claim 1 is characterized in that: The support platform has a clearance gap, and along the first direction, the orthographic projection of the clearance gap overlaps with the orthographic projection of the second sensor component.

10. A prestressed pipe pile monitoring method based on capacitance principle, characterized in that: Use the prestressed pipe pile monitoring device based on the capacitance principle as described in any one of claims 1 to 9.

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