Replaceable sensitive part of anchor cable dynamometer and its replacement method

Abstract

The application discloses a replaceable sensitive component anchor cable dynamometer and a replacement method thereof, the dynamometer comprising a bearing cylinder, a plurality of sensitive components being arranged on the outer wall of the bearing cylinder in a circumferential direction at intervals, and the sensitive components being detachably fixedly connected with the bearing cylinder; a sealing shell being sleeved on the periphery of the bearing cylinder. The sensitive components and the sealing shell of the dynamometer are designed as detachable mechanical components. Meanwhile, a method for re-establishing the corresponding relationship between the load borne by the anchor cable bearing cylinder and the output of the sensitive components is provided, so that the anchor cable dynamometer can restore normal measurement after the sensitive components are replaced, the problem of instrument scrapping caused by the damage of the sensitive components of the anchor cable dynamometer is solved, and resource waste is reduced.

Description

TECHNICAL FIELD

[0001] The application discloses an anchor cable dynamometer with replaceable sensitive components and a replacement method thereof, and is mainly used for monitoring the anchor cable force of the prestress of a structure in the fields of hydraulic structures, other concrete structures, rock slopes, bridges and the like. BACKGROUND

[0002] The anchor cable dynamometer is widely used in structures such as hydraulic structures, other concrete structures, rock slopes, bridges and the like, and is used for monitoring the anchoring state of the prestress of the structure. The anchor cable dynamometer is uniformly distributed with a plurality of sensitive components on a bearing cylinder. When the load causes the bearing cylinder to produce axial deformation, the sensitive components produce synchronous strain with the bearing cylinder. The function relationship between the output of the overall sensitive component and the load of the bearing cylinder, which is calibrated when the instrument is delivered, can be used to calculate the load value borne by the anchor cable dynamometer. In the initial installation period, the anchor cable dynamometer has completed the design specified pretightening tension, and cannot be loosened in the later period. In the actual use process, the situation that one or more sensitive components of the anchor cable dynamometer are damaged often occurs. At this time, the original sensitive components of the anchor cable dynamometer cannot be replaced on site, and can only be scrapped, resulting in great resource waste.

[0003] So far, no relevant papers and patent literature reports have been found about the anchor cable dynamometer which can replace the sensitive components alone after installation. The structures of the anchor cable dynamometers sold on the market are mostly similar to the above structure, and the structure cannot replace the sensitive components alone after installation. When one or more sensitive components are damaged, the entire anchor cable dynamometer cannot work normally.

[0004] The anchor cable dynamometer on site has been subjected to the structure pretightening tension according to the design requirements during installation, and the bearing cylinder part cannot be disassembled in the later running process. When one or more sensitive components of the dynamometer are damaged, the existing anchor cable dynamometer cannot replace the sensitive components, and thus the anchor cable dynamometer is scrapped, failing to meet the design requirements. SUMMARY

[0005] In view of the above technical problems, the application provides an anchor cable dynamometer which can replace the sensitive components without affecting the pretightening force of the bearing cylinder. After the sensitive components are replaced, a replacement method is further provided to reestablish the corresponding relationship between the load borne by the anchor cable bearing cylinder and the output of the sensitive components, so that the anchor cable dynamometer can work normally, and the situation that the instrument part is scrapped as a whole due to the damage of the sensitive components is avoided.

[0006] In order to achieve the above technical purposes, the application adopts the following technical means:

[0007] The anchor cable dynamometer with replaceable sensitive components comprises:

[0008] The load-bearing cylinder is provided with a plurality of sensitive components which are fixedly connected with the load-bearing cylinder and can truly reflect the strain of the load-bearing cylinder.

[0009] The sealing shell is connected with the load-bearing cylinder through the second connecting member and the sealing gasket.

[0010] The load-bearing cylinder comprises a simple body, a first annular protrusion arranged at one end of the simple body, and a second annular protrusion arranged at the other end of the simple body, and the first annular protrusion and the second annular protrusion form an installation space for installing the sensitive components.

[0011] The simple body is provided with threaded holes on the outer wall, and the sensitive components are threadedly connected with the threaded holes on the outer wall of the simple body.

[0012] The sealing shell comprises two half-joint bodies which form a half-joint pipe joint, and the side edges of the half-joint bodies are provided with first lips for abutting in the axial direction, and the first lips are provided with a plurality of first bolt holes.

[0013] The sealing gasket is arranged on the inner side of the lips and the circumferential inner side of the end of the half-joint body, and the half-joint pipe joint is formed by connecting and enclosing the upper and lower ends of the half-joint pipe joint, the sealing gasket, and the two annular protrusions at the two ends of the load-bearing cylinder through the bolt fasteners.

[0014] The sealing gasket comprises two sealing gasket halves which form a sealing gasket, and the sealing gasket comprises a first annular sealing part for sealing the outer periphery of the first annular protrusion, a second annular sealing part for sealing the outer periphery of the second annular protrusion, and a second lip connected between the first annular sealing part and the second annular sealing part, and the second lip is provided with a plurality of second bolt holes for inserting the bolt fasteners.

[0015] The application further discloses a sensitive component replacement method of the anchor cable dynamometer based on the replaceable sensitive components, and the corresponding relationship between the load borne by the anchor cable load-bearing cylinder and the output of each sensitive component is established again, so that the anchor cable dynamometer can restore normal measurement after replacing the sensitive components, and the method comprises the following steps:

[0016] S1, before the instrument is shipped, the relationship between the load borne by the load-bearing cylinder F and the strain of the load-bearing cylinder ε1 is obtained through calibration, and is recorded in a calibration table, and the fitting formula is as formula (1).

[0017] F=k·ε1+b (1)

[0018] Wherein, F is the load of the anchor cable dynamometer, k is the coefficient of the first order term, ε1 is the strain of the bearing cylinder, b is the constant term coefficient;

[0019] S2, then the respective calibration of each sensitive component output N i and the relationship between the strain ε i2 , its fitting formula as formula (2):

[0020]

[0021] Wherein, A i , B i , C i are the constant term coefficient, the coefficient of the first order term and the coefficient of the second order term of the fitting formula respectively;

[0022] S3, the sensitive component is fixed to the bearing cylinder, when the bearing cylinder is subjected to external force, the sensitive component deforms with the bearing cylinder, the arithmetic mean of the strain ε i2 of all the sensitive components assembled on the bearing cylinder is taken as the strain ε2 sensed by the overall sensitive component, and the strain ε2 is taken as the strain ε1 of the bearing cylinder;

[0023] When one or several sensitive components are damaged, the initial load F1 of the bearing cylinder after replacing the sensitive components is calculated;

[0024] S4, after replacing the new sensitive components, the strain ε′ i2 of the new replaced sensitive components is calculated according to the fitting formula (2) combined with the output N′ i of the new replaced sensitive components; the strain ε″ i2 of all the sensitive components which are not replaced is calculated by the same method; the arithmetic mean of the strain ε′ i2 of the new replaced sensitive components and the strain ε″ i2 of all the sensitive components which are not replaced is taken as the strain ε′2 of the overall sensitive component after replacement, and the strain ε′2 of the overall sensitive component after replacement is taken as the strain ε′1 of the bearing cylinder, and the corresponding relationship between the load F′ of the bearing cylinder after replacing the sensitive components and the output N′ i of each new replaced sensitive component is re-established according to formula (1);

[0025] S5, finally, the load F of the bearing cylinder before replacing the sensitive components is taken as the initial load F1 of the bearing cylinder after replacing the sensitive components, the load F′ of the anchor cable dynamometer after replacing the sensitive components is connected, and the anchor cable dynamometer resumes normal measurement.

[0026] In the S3 step, the calculation of the initial load F1 of the bearing cylinder after replacing the sensitive components is divided into the following two cases:

[0027] Scenario 1: The load on the anchor cable force gauge remains unchanged. The load F of the load-bearing cylinder calculated before the original sensitive component was damaged is used as the initial load value F1 of the load-bearing cylinder after the sensitive component is replaced.

[0028] Scenario 2: Based on the output N of the remaining unreplaced sensitive components. i Calculate the strain ε for each remaining unreplaced sensitive component. i2 The strain ε of all remaining unreplaced sensitive components i2 After averaging, the strain ε2 sensed by the overall sensitive component is obtained. This strain is used as the strain ε1 of the load-bearing cylinder. Then, the load F of the load-bearing cylinder before the sensitive component is replaced is calculated according to formula (1), and this load is used as the initial load value F1 of the load-bearing cylinder after the sensitive component is replaced.

[0029] The output of the sensitive component is the resistance ratio, frequency modulus, or wavelength.

[0030] Beneficial effects:

[0031] This invention designs the sensitive component and sealing shell in a detachable manner that does not affect the preload of the load-bearing cylinder, ensuring a tight seal while allowing the sensitive component to be replaced without removing the load-bearing cylinder. Furthermore, this invention proposes a method to re-establish the correspondence between the load on the anchor cable load-bearing cylinder and the output of the sensitive component, enabling the anchor cable force gauge to resume normal measurement after replacing the sensitive component, thus significantly reducing resource waste. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the anchor cable force gauge with replaceable sensitive components according to the present invention.

[0033] In this diagram, 1 is a bolt; 2 is a sealed outer shell; 3 is a sealing gasket; 4 is a load-bearing cylinder; 5 is a screw; 6 is a sensitive component; and 7 is a nut. Detailed Implementation

[0034] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The anchor cable force gauge designed in this invention is as follows: Figure 1 As shown, it mainly consists of a load-bearing cylinder 4, a sensitive component 6, a sealed outer shell 2, and a sealing gasket 3.

[0036] Three to six sensitive components 6 are evenly fixed to the outer circumference of the load-bearing cylinder 4 with screws 5 to ensure that the sensitive components 6 can accurately reflect the strain of the load-bearing cylinder 4.

[0037] The sealed outer shell 2 is designed as a split structure, and together with the sealing gasket 3, it is fixed to the outside of the load-bearing cylinder 4 by bolts 1 and nuts 7 to make it sealed.

[0038] Through the design of the present application, if the sensitive components are damaged after the anchor cable dynamometer is installed on site, the sealing shell 2 can be opened and the sensitive components 6 can be replaced individually.

[0039] After the sensitive components are replaced, the corresponding relationship between the load borne by the new load-bearing cylinder and the output of the sensitive components is established by the method provided by the present application, so that the anchor cable dynamometer returns to the normal measurement state, and the specific implementation method is as follows:

[0040] Within the elastic range, the fitting formula between the load-bearing cylinder load and the strain of the load-bearing cylinder is as formula (1).

[0041] F=k·ε1+b (1)

[0042] In the formula, F is the load borne by the anchor cable dynamometer, k is the first-order coefficient (constant), ε1 is the strain of the load-bearing cylinder, and b is the constant term coefficient. In the International System of Units, the unit of F is Newton;

[0043] Before the instrument is shipped, the first-order coefficient k value and the constant term coefficient b value of the load-bearing cylinder are first obtained through calibration and recorded in the calibration table.

[0044] Then the output N of each sensitive component is calibrated i , such as resistance ratio, frequency modulus or wavelength, and the relationship between the strain ε i2 is represented by formula (2):

[0045]

[0046] In the formula, A i , B i , and C i are the constant term coefficient, the first-order coefficient, and the second-order coefficient of the fitting formula, respectively.

[0047] The sensitive components are fixed to the load-bearing cylinder, and when the load-bearing cylinder is subjected to external force, the sensitive components deform together with the load-bearing cylinder; the arithmetic mean of the strain ε i2 of all the sensitive components assembled on the load-bearing cylinder is taken as the strain ε2 sensed by the overall sensitive components. The strain is also taken as the strain ε1 of the load-bearing cylinder.

[0048] In this way, when one or several sensitive components are damaged, two cases can be divided:

[0049] Case one: when the load borne by the anchor cable dynamometer does not change by more than 10% of the average load and there is no monotonic deviation before the damage occurs, it can be considered that the load borne by the anchor cable dynamometer is unchanged, and the load F of the load-bearing cylinder calculated before the original sensitive components are damaged is taken as the initial load F1 of the load-bearing cylinder after replacement;

[0050] Scenario 2: If, before the anchor cable dynamometer fails, the load variation exceeds 10% of the average load, or if the load exhibits a monotonic deviation, the output N of the remaining sensitive components should be used as the basis for assessment. i The strain ε of each sensitive component was calculated. i2 The strain ε of all sensitive components i2 After averaging, the strain ε2 of the overall sensitive component is obtained. This strain is used as the strain ε1 of the load-bearing cylinder. Then, the load F of the load-bearing cylinder before replacement is calculated according to formula (1), and this load is used as the initial load value F1 of the load-bearing cylinder after replacement.

[0051] After replacing the sensitive component, the output N′ of the newly replaced sensitive component is calculated. i The strain ε′ of the newly replaced sensitive component is calculated using the fitting formula (2) for the sensitive component. i2 The same method was used to calculate the strain ε″ for all sensitive components that were not replaced. i2 The strain ε′ of the newly replaced sensitive component will be... i2 The strain ε″ of all sensitive components that were not replaced i2 The arithmetic mean of the values ​​is taken as the overall strain ε′2 of the replaced sensitive components. At the same time, ε′2 is taken as the strain ε′1 of the load-bearing cylinder. Then, according to formula (1), the load F′ of the load-bearing cylinder after the replacement of the sensitive components and the measured value N′ of each sensitive component can be re-established. i The correspondence between them.

[0052] Finally, the load F of the bearing cylinder before the sensitive component was replaced is taken as the initial load F1 of the bearing cylinder after the sensitive component was replaced. Then, the load F′ of the anchor cable force gauge after the sensitive component was replaced is connected, and the anchor cable force gauge resumes normal measurement.

[0053] This invention relates to an anchor cable force gauge whose sensitive component can be replaced without affecting the preload of the load-bearing cylinder. Both the sensitive component and the sealed housing of this force gauge are designed as detachable mechanical parts.

[0054] The anchor cable force gauge designed in this invention provides the functional relationship between the load on the bearing cylinder and the strain of the bearing cylinder at the time of manufacture: F = k·x1 + b. It also provides the strain ε of each sensitive component. i2 With the output of the sensitive component N i Functional relationship between After replacing the sensitive component, the functional relationship between the original load-bearing cylinder load F and the strain ε1 of the load-bearing cylinder remains unchanged, while the strain ε′ of the new sensitive component remains unchanged. i2 Its output N′ i The functional relationship between them is given at the factory. Therefore, the output value N′ of the new sensitive component can be determined accordingly. iThe load F' of the load-bearing cylinder is calculated, the problem of instrument scrapping caused by damage of the sensitive component of the anchor cable dynamometer is solved, and the measurement purpose is achieved.

[0055] Through the structural design and the provided calculation method, the damaged sensitive component can be replaced without affecting the pre-tightening force of the load-bearing cylinder, and the corresponding relationship between the load borne by the anchor cable load-bearing cylinder and the output of each sensitive component is established, so that the anchor cable dynamometer is restored to normal measurement.

[0056] The sensitive component mounting mode and the sealed shell structure are not limited to the forms mentioned in the text, all the structures that involve the sensitive component and the sealed shell on the load-bearing cylinder being designed as a detachable structure form without affecting the pre-tightening force of the load-bearing cylinder belong to the protection scope of the present application. In addition, the method for re-establishing the corresponding relationship between the load borne by the anchor cable load-bearing cylinder and the output of each sensitive component after the sensitive component is replaced also belongs to the protection scope of the present application.

Claims

1. A method for replacing the sensitive component of an anchor cable force gauge with a replaceable sensitive component, wherein the anchor cable force gauge with a replaceable sensitive component comprises: A load-bearing cylinder, wherein a plurality of sensitive components (6) are provided circumferentially on the outer wall of the load-bearing cylinder, and the sensitive components (6) are detachably fixedly connected to the load-bearing cylinder so that the sensitive components can accurately reflect the strain of the load-bearing cylinder; The sealed outer shell is sealed to the periphery of the load-bearing cylinder by means of a second connector and a sealing gasket; The load-bearing cylinder includes a cylinder body, a first annular protrusion disposed at one end of the cylinder body, and a second annular protrusion disposed at the other end of the cylinder body, wherein the first annular protrusion and the second annular protrusion form an installation space for installing the sensitive component (6). The outer wall of the cylinder is provided with a threaded hole, and the sensitive component is threadedly connected to the threaded hole on the outer wall of the cylinder by a screw, so that the damaged sensitive component can be replaced without affecting the preload of the load-bearing cylinder. The feature is that the correspondence between the load on the anchor cable load-bearing cylinder and the output of each sensitive component is re-established, so that the anchor cable force gauge can resume normal measurement after the sensitive component is replaced. The feature includes the following steps: S1. Before the instrument leaves the factory, the relationship between the load F of the load-bearing cylinder and the strain ε1 of the load-bearing cylinder is obtained through calibration and recorded in the calibration table. The fitting formula is as shown in equation (1). F=k·ε1+b (1) Where F is the load on the anchor cable force gauge, k is the coefficient of the first term, ε1 is the strain of the load-bearing cylinder, and b is the coefficient of the constant term; S2, and then calibrate the output N of each sensitive component respectively. i With the strain ε of sensitive components i2 The relationship between them is fitted by the formula shown in equation (2): Among them, A i B i C i These are the constant term coefficients, linear term coefficients, and quadratic term coefficients of the fitted formula, respectively. S3. Fix the sensitive components to the load-bearing cylinder. When the load-bearing cylinder is subjected to external force, the sensitive components deform together with the load-bearing cylinder. Take the strain ε of all sensitive components assembled on the load-bearing cylinder. i2 The arithmetic mean of the values ​​is used as the overall strain ε2 sensed by the sensitive components, and at the same time, this strain ε2 is used as the strain ε1 of the load-bearing cylinder; When one or more sensitive components fail, calculate the initial load F1 on the load-bearing cylinder after replacing the sensitive components: S4. After replacing the sensitive component, output N′ based on the newly replaced sensitive component. i The strain ε′ of the newly replaced sensitive component was calculated using the fitting formula (2). i2 The strain ε″ of all unreplaced sensitive components was calculated using the same method. i2 The strain ε′ of the newly replaced sensitive component will be... i2 The strain ε′ of all sensitive components that were not replaced i2 The arithmetic mean of the values ​​is taken as the strain ε′2 of the overall sensitive component after replacement. At the same time, the strain ε′2 of the overall sensitive component after replacement is taken as the strain ε′1 of the load-bearing cylinder. Then, according to formula (1), the load F′ on the load-bearing cylinder after the replacement of the sensitive component and the output N′ of each newly replaced sensitive component are re-established. i The correspondence between them; S5. Finally, the load F of the bearing cylinder before the sensitive component is replaced is taken as the initial load F1 of the bearing cylinder after the sensitive component is replaced. Then, the load′ of the anchor cable force gauge after the sensitive component is replaced is connected, and the anchor cable force gauge resumes normal measurement.

2. The method for replacing the sensitive component of the anchor cable force gauge with replaceable sensitive components according to claim 1, characterized in that, The sealing shell includes two half-sections, which together form a half-section pipe joint. The sides of the half-sections are provided with a first lip for docking along the axial direction, and the first lip is provided with a plurality of first bolt holes. The sealing gasket is arranged on the inner side of the lip and the inner side of the end of the half-section. After the two first lips are connected and enclosed by bolt fasteners, a contact seal is formed between the upper and lower ends of the half-section, the sealing gasket, and the two annular protrusions at both ends of the load-bearing cylinder.

3. The method for replacing the sensitive component of the anchor cable force gauge with replaceable sensitive components according to claim 2, characterized in that, The sealing gasket includes two sealing gasket halves, which together form a sealing gasket. The sealing gasket includes a first annular sealing portion for sealing the outer periphery of the first annular protrusion, a second annular sealing portion for sealing the outer periphery of the second annular protrusion, and a second lip connecting the first annular sealing portion and the second annular sealing portion. The second lip is provided with a plurality of second bolt holes, which are for the bolt fasteners used for fastening the connection to be inserted.

4. The method for replacing the sensitive component of the anchor cable force gauge with replaceable sensitive components according to claim 1, characterized in that, In step S3, the initial load value F1 of the load-bearing cylinder after replacing the sensitive component is calculated in the following two cases: Scenario 1: The load on the anchor cable force gauge remains unchanged. The load F of the load-bearing cylinder calculated before the original sensitive component was damaged is used as the initial load value F1 of the load-bearing cylinder after the sensitive component is replaced. Scenario 2: Based on the output N of the remaining unreplaced sensitive components. i Calculate the strain ε for each remaining unreplaced sensitive component. i2 The strain ε of all remaining unreplaced sensitive components i2 After averaging, the strain ε2 sensed by the overall sensitive component is obtained. This strain is used as the strain ε1 of the load-bearing cylinder. Then, the load F of the load-bearing cylinder before the sensitive component is replaced is calculated according to formula (1), and this load is used as the initial load value F1 of the load-bearing cylinder after the sensitive component is replaced.

5. The method for replacing the sensitive component of the anchor cable force gauge with replaceable sensitive components according to claim 1, characterized in that, The output of the sensitive component is the resistance ratio, frequency modulus, or wavelength.

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