CN110411688B - Support safety monitoring device - Google Patents
Support safety monitoring device Download PDFInfo
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- CN110411688B CN110411688B CN201910699901.7A CN201910699901A CN110411688B CN 110411688 B CN110411688 B CN 110411688B CN 201910699901 A CN201910699901 A CN 201910699901A CN 110411688 B CN110411688 B CN 110411688B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
Abstract
The invention discloses a support safety monitoring device, which comprises an analyzer and a plurality of fan-shaped strain flowers, wherein the analyzer is connected with the fan-shaped strain flowers; the receiving unit of the analyzer receives strain data of each side surface of the support measured by the fan-shaped strain rosettes; a judging unit of the analyzer judges whether the strain data of each side surface meets a preset condition; when the stress analysis unit of the analyzer judges that the strain data of each side surface meet the preset conditions, the stress analysis unit calculates the main compressive stress and main tensile stress of each side surface according to the strain data of each side surface, determines the stress state of the support and sends the stress state to the feedback unit of the analyzer so as to feed back the stress state to a user; and when the fault analysis unit of the analyzer judges that the strain data of a certain side surface does not meet the preset condition, the shear stress of the side surface opposite to the side surface is calculated, and the fault result of the strain gauge of the side surface is determined and sent to the feedback unit so as to be fed back to a user. The invention can improve the accuracy of safety monitoring of the support.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a support safety monitoring device.
Background
The support is one of important components of a bridge, and the bridge in China at present usually adopts a plate type rubber support. In recent years, the society pays more attention to bridge safety, and the support is used as a force transmission component of a lower structure on a bridge, so that the support safety is closely related to the bridge safety, and the safety monitoring on the support has very important practical significance.
At present, generally, the vertical stress state and the geometric deformation state of the support are monitored, so that the safety monitoring of the support is realized. However, in the process of implementing the invention, the inventor finds that, because the support structure is a spatial structure, the void or shear deformation may occur on multiple surfaces of the support at the same time, and the influence of various diseases caused by design, construction or operation on the support structure is not independent, only the vertical stress state and the geometric deformation state of the support are monitored, the spatial property is not strong, which leads to lower accuracy of the monitored stress state of the support, thus leading to lower accuracy of safety monitoring of the support, and meanwhile, because of the problem of environmental conditions of the bridge, the monitoring device is easily damaged by the influence of the environment, which affects the reliability of the monitoring device, while the existing monitoring device does not verify the reliability of the device itself during monitoring, so that the potential safety hazard of the monitoring device cannot be found in time, which leads to the problem of inaccurate monitoring result caused by the low reliability of the monitoring device, resulting in less accurate safety monitoring of the mount.
Disclosure of Invention
The embodiment of the invention provides a support safety monitoring device, which can determine the spatial stress state of a support to be detected according to the calculated main compressive stress and main tensile stress of each side surface of the support to be detected, so that the accuracy of the monitored support stress state can be effectively improved, and the reliability of the device is verified before the spatial stress state of the support to be detected is determined, so that the accuracy of support safety monitoring can be effectively improved.
In order to achieve the above object, an embodiment of the present invention provides a device for monitoring safety of a support, including an analyzer and a plurality of strain rosettes; each fan-shaped strain rosette is correspondingly adhered to each side surface of the support to be tested;
each sector strain rosette comprises a strain gauge in the vertical direction, a strain gauge in the direction forming an included angle of 45 degrees with the horizontal direction, a strain gauge in the horizontal direction and a strain gauge in the direction forming an included angle of 135 degrees with the horizontal direction;
the fan-shaped strain rosette is used for measuring strain data of the side surface to which the fan-shaped strain rosette is adhered and sending the strain data to the analyzer;
the analyzer comprises a receiving unit, a judging unit, a stress analyzing unit, a fault analyzing unit and a feedback unit;
the receiving unit is used for receiving strain data of each side surface of the support to be tested;
the judging unit is used for judging whether the strain data of each side surface meets a preset condition or not;
the stress analysis unit is used for calculating the main compressive stress and the main tensile stress of each side surface according to the strain data of each side surface when the strain data of each side surface meet the preset conditions, determining the stress state of the support to be tested according to the main compressive stress and the main tensile stress of each side surface, and sending the stress state of the support to be tested to the feedback unit;
the fault analysis unit is used for calculating the shearing stress of the side surface opposite to the side surface when the strain data of the side surface is judged not to meet the preset condition, determining the fault result of the strain gauge of the side surface according to the shearing stress and the strain data of the side surface, and sending the fault result of the strain gauge to the feedback unit;
the feedback unit is used for feeding back the received stress state; and the device is also used for feeding back the received strain gauge fault result.
As a modification of the above, the preset condition is45+135＝0+90；
Wherein the content of the first and second substances,45is the strain data for this side at 45 to the horizontal,135is the strain data for this side at 135 deg. to the horizontal,0for the strain data of the side in the horizontal direction,90is the strain data of the side in the vertical direction.
As an improvement of the above scheme, the main tensile stress of each side surface of the support to be tested is calculated by the following formula:
in the formula, σ1The main tensile stress of a certain side face, E is the elastic modulus of the support to be measured, upsilon is the Poisson ratio of the support to be measured,45is the strain data for this side at 45 to the horizontal,135the side face forms an included angle with the horizontal directionThe strain data in the 135 direction was,0for the strain data of the side in the horizontal direction,90is the strain data of the side in the vertical direction.
As an improvement of the above scheme, the main compressive stress of each side surface of the support to be tested is calculated by the following formula:
in the formula, σ2The main pressure stress of a certain side face, E is the elastic modulus of the support to be measured, upsilon is the Poisson ratio of the support to be measured,45is the strain data for this side at 45 to the horizontal,135is the strain data for this side at 135 deg. to the horizontal,0for the strain data of the side in the horizontal direction,90is the strain data of the side in the vertical direction.
As an improvement of the above scheme, the stress state of the support to be tested is determined by the following steps:
judging whether the main pressure stress of each side surface in the support to be tested is equal or not;
when the main pressure stress of each side face in the support to be tested is judged to be equal, determining that no bias voltage occurs in the support to be tested;
when the main compressive stresses of all the side surfaces in the support to be tested are judged to be unequal, determining the bias voltage of the support to be tested, calculating the maximum value in the main compressive stresses of all the side surfaces in the support to be tested, and taking the side surface corresponding to the maximum value as the bias voltage side of the support to be tested;
judging whether the main tensile stress of each side surface in the support to be tested is equal to the main tensile stress of the opposite side surface;
when the main tensile stress of each side face in the support to be tested is judged to be equal to the main tensile stress of the opposite side face, determining that the support to be tested is not inclined;
and when judging that the main tensile stress of a certain side face is not equal to the main tensile stress of the opposite side face, taking the side face with smaller main tensile stress in the side face and the opposite side face as the inclined side of the support to be tested.
As an improvement of the above scheme, the fault analysis module is specifically configured to:
when the strain data of a certain side surface is judged not to meet the preset conditions, calculating the shear stress of the side surface opposite to the side surface, and entering the next step;
according to the shearing stress and the preset error, obtaining an alignment check value, and entering the next step;
by the formula
Calculating to obtain a first value tau to be correctedmax1And judging the first value to be corrected taumax1If the error is not equal to the alignment value to be corrected, the next step is carried out, and if the error is not equal to the alignment value to be corrected, the error result of the strain gauge is determined to be that the strain gauge adhered to the side surface in the horizontal direction has an error, the error result of the strain gauge is sent to the feedback unit, and the error analysis of the strain gauge on the side surface is finished;
by the formula
Calculating to obtain a second value tau to be correctedmax2And judging the second value to be corrected taumax2If the error result of the strain gauge is not equal to the alignment value to be corrected, the next step is carried out, if not, the error result of the strain gauge is determined to be that the strain gauge which is pasted on the side surface and forms an included angle of 135 degrees with the horizontal direction has an error, the error result of the strain gauge is sent to the feedback unit, and the error analysis of the strain gauge on the side surface is finished;
by the formula
Calculating to obtain a third value tau to be correctedmax3And judging the third value tau to be correctedmax3Whether the alignment value is equal to the alignment value to be corrected or not is judged, if yes, the next step is carried out, and if not, the failure result of the strain gauge is determined to beThe strain gauge adhered to the side surface in the vertical direction breaks down, the strain gauge fault result is sent to the feedback unit, and the strain gauge fault analysis of the side surface is finished;
by the formula
Calculating to obtain a fourth value tau to be correctedmax4And judging the fourth value tau to be correctedmax4If the error result of the strain gauge is not equal to the alignment value to be corrected, the next step is carried out, if not, the error result of the strain gauge is determined to be that the strain gauge which is pasted on the side surface and forms an angle of 45 degrees with the horizontal direction has an error, the error result of the strain gauge is sent to the feedback unit, and the error analysis of the strain gauge on the side surface is finished;
determining that the failure result of the strain gauge is that two or more of the four strain gauges stuck on the side surface have failed, sending the failure result of the strain gauge to the feedback unit, and finishing the failure analysis of the strain gauge on the side surface;
wherein the content of the first and second substances,
x1＝0，y1＝45+135-0，γxy1＝135-45；
45strain data of the side surface in a direction forming an included angle of 45 degrees with the horizontal direction;135strain data of the side surface in a direction forming an included angle of 135 degrees with the horizontal direction;0strain data of the side surface in the horizontal direction;90is the strain data of the side in the vertical direction.
As an improvement of the above scheme, the shear stress of each side surface of the support to be tested is calculated by the following formula:
in the formula, τmaxThe shear stress of a certain side face is shown, E is the elastic modulus of the support to be measured, upsilon is the Poisson ratio of the support to be measured,45is the strain data for this side at 45 to the horizontal,135is the strain data for this side at 135 deg. to the horizontal,0for the strain data of the side in the horizontal direction,90is the strain data of the side in the vertical direction.
As an improvement of the above scheme, the fan-shaped strain rosettes are connected with the analyzer through leads;
the support safety monitoring device further comprises a protection wire box channel, and the protection wire box channel is used for protecting a wire connected with the fan-shaped strain rosette and the analyzer.
As an improvement of the above scheme, the feedback unit is a display;
the display is used for displaying the received stress state so as to feed back the stress state to the user; and the strain gauge monitoring system is also used for displaying the received strain gauge fault result so as to feed back the strain gauge fault result to a user.
As an improvement of the scheme, each fan-shaped strain flower is provided with a protective covering layer;
the protective covering layer is used for protecting the fan-shaped strain flowers.
Compared with the prior art, the support safety monitoring device provided by the embodiment of the invention comprises an analyzer and a plurality of fan-shaped strain flowers; the fan-shaped strain rosettes measure strain data of the side face to which the fan-shaped strain rosettes are pasted and send the strain data to the analyzer; a receiving unit of the analyzer receives strain data of each side face of the support to be tested; a judging unit of the analyzer judges whether the strain data of each side surface meets a preset condition; when the stress analysis unit of the analyzer judges that the strain data of each side surface meet the preset conditions, the stress analysis unit calculates the main compressive stress and main tensile stress of each side surface according to the strain data of each side surface, determines the stress state of the support to be tested according to the main compressive stress and main tensile stress of each side surface, and sends the stress state of the support to be tested to the feedback unit of the analyzer so as to feed back the stress state to a user; and when the fault analysis unit of the analyzer judges that the strain data of a certain side surface does not meet the preset condition, the fault analysis unit calculates the shear stress of the side surface opposite to the side surface, determines the fault result of the strain gauge of the side surface according to the shear stress and the strain data of the side surface, and sends the fault result of the strain gauge to the feedback unit so as to feed back the fault result to a user. When the bridge support is safely monitored, the main pressure stress and the main tensile stress of each side surface of the support are calculated according to the strain data of each side surface of the support, and then the stress state of the support to be detected is determined according to the main pressure stress and the main tensile stress of each side surface, so that the spatial stress state can be analyzed from the self structure of the support, the problem that the accuracy of the monitored stress state of the support is low due to the fact that the spatial property is not strong because only the vertical stress state and the geometric deformation state of the support are monitored in the prior art is solved, the accuracy of the monitored stress state can be effectively improved, the reliability of the device is verified before the spatial stress state of the support is determined, the potential reliability hazard of the device can be timely found and fed back, so that a worker can timely find the abnormal condition of the device and maintain the problem of inaccurate monitoring result caused by the low reliability of the device is solved, the accuracy of safety monitoring of the support can be effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of a support safety monitoring device in an embodiment of the invention.
Fig. 2 is a schematic structural view of a fan-shaped strain flower in the embodiment of the present invention.
Fig. 3 is a schematic view of an application scenario of the pedestal safety monitoring device in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a pedestal safety monitoring device in an embodiment of the present invention is shown.
The embodiment of the invention provides a support safety monitoring device, which comprises an analyzer 10 and a plurality of fan- shaped strain flowers 21 and 22 … 2 n; wherein, each fan-shaped strain rosette is correspondingly stuck on each side surface of the support to be measured.
Referring to fig. 2, each strain gage 4-1 in the vertical direction, strain gage 4-2 in the direction forming an angle of 45 ° with the horizontal direction, strain gage 4-3 in the horizontal direction, and strain gage 4-4 in the direction forming an angle of 135 ° with the horizontal direction.
The fan- shaped strain rosettes 21, 22 … 2n are used for measuring the strain data of the side face to which the strain rosettes are attached and sending the strain data to the analyzer 10.
The analyzer 10 includes a receiving unit 11, a judging unit 12, a force analyzing unit 13, a failure analyzing unit 14, and a feedback unit 15.
The receiving unit 11 is configured to receive strain data of each side surface of the support to be tested.
The judging unit 12 is configured to judge whether the strain data of each side surface meets a preset condition.
And the stress analysis unit 13 is configured to calculate a main compressive stress and a main tensile stress of each side surface according to the strain data of each side surface when it is determined that the strain data of each side surface all satisfy a preset condition, determine a stress state of the to-be-tested support according to the main compressive stress and the main tensile stress of each side surface, and send the stress state of the to-be-tested support to the feedback unit 15.
The failure analysis unit 14 is configured to calculate a shear stress of a side surface opposite to the side surface when it is determined that the strain data of the side surface does not satisfy a preset condition, determine a failure result of the strain gauge of the side surface according to the shear stress and the strain data of the side surface, and send the failure result of the strain gauge to the feedback unit 15.
The feedback unit 15 is configured to feed back the received stress state; and the device is also used for feeding back the received strain gauge fault result.
It should be noted that the strain data of each side face includes the strain data of the side face in the direction forming an angle of 45 degrees with the horizontal direction45Strain data of the side surface in a direction forming an angle of 135 degrees with the horizontal direction135Strain data of the side in the horizontal direction0Strain data of the side in the vertical direction90The strain gauge is obtained by respectively measuring a strain gauge 4-2 which is adhered to the fan-shaped strain rosette on the side surface and forms an angle of 45 degrees with the horizontal direction, a strain gauge 4-4 which forms an angle of 135 degrees with the horizontal direction, a strain gauge 4-3 in the horizontal direction and a strain gauge 4-1 in the vertical direction.
It is understood that the feedback unit 15 can be a voice player, a display, etc.
It will be appreciated that each fan-shaped strain gage is attached to a side surface of the holder such that strain gage 4-1 therein in the vertical direction is perpendicular to the bottom edge of the side surface, strain gage 4-2 in the direction making an angle of 45 with the horizontal direction is making an angle of 45 with the bottom edge of the side surface, strain gage 4-3 in the horizontal direction is parallel to the bottom edge of the side surface, and strain gage 4-4 in the direction making an angle of 135 with the horizontal direction is making an angle of 135 with the bottom edge of the side surface.
Specifically, the preset condition is45+135＝0+90；
Wherein the content of the first and second substances,45is the strain data for this side at 45 to the horizontal,135is the strain data for this side at 135 deg. to the horizontal,0for the strain data of the side in the horizontal direction,90for the strain data of the side in the vertical direction。
It will be appreciated that the strain data for each side of the support under test is satisfied45+135＝0+90When the strain gauge is attached to the fan-shaped strain flower, the strain data measured on the side surface is not abnormal, that is, the strain gauge attached to the fan-shaped strain flower on the side surface is not abnormal.
The support safety monitoring device provided by the embodiment can be applied to various bridge supports. The working principle of the support safety monitoring device provided in this embodiment is described below with reference to specific application scenarios.
Fig. 3 is a schematic view of an application scenario of the support safety monitoring device in the embodiment of the present invention.
In this application scenario, the support 3 to be tested is arranged on the support lower cushion stone 2, and the support 3 to be tested comprises four side faces. The four fan-shaped strain patterns of the support safety monitoring device are respectively and correspondingly adhered to four side surfaces of the support 3 to be measured so as to measure strain data of the adhered side surfaces and send the strain data to the analyzer 10. After receiving the strain data of the four sides of the support 3 to be tested, the receiving unit 11 of the analyzer 10 first determines whether the strain data of the four sides all satisfy the preset condition by the determining unit 12, so as to determine whether the device is damaged, thereby checking the reliability of the device. When the strain data of the four sides of the support to be detected meet the preset conditions, the device is not damaged, at the moment, the stress analysis unit 13 calculates the main pressure stress and the main tensile stress of each side according to the strain data of each side, then determines the spatial stress states of the support to be detected, such as bias voltage or/and inclination, and the like according to the main pressure stress and the main tensile stress of each side, sends the stress state of the support to be detected 3 to the feedback unit 15, and the feedback unit 15 feeds back the received stress state, so that a worker can find the abnormal condition of the support in time and maintain the support. When judging that the strain data of a certain side surface does not satisfy the preset condition, the device is in failure, according to the mutual equivalence theorem of the shear stress, the shear stress of the side surface is theoretically the same as the shear stress of the side surface opposite to the side surface (namely, the opposite side surface), the device can be assumed and trial calculated according to the strain data of the side surface to realize the directional search of the failed strain gauge by taking the shear stress of the side surface opposite to the side surface (namely, the opposite side surface) as accurate data, so as to obtain the strain gauge failure result of the side surface, at the moment, the failure analysis unit 14 calculates the shear stress of the side surface opposite to the side surface (namely, the opposite side surface) as a correction index, then according to the calculated shear stress and the strain data of the side surface, the failure result of the side surface is determined, the strain gauge failure result of the side surface is sent to the feedback unit 15, the feedback unit 15 feeds back the received strain gauge failure result, so that the staff can find the abnormal condition of the device in time and maintain the device.
Further, the present invention also provides various preferred embodiments on the basis of the above-described examples, and the various embodiments provided below are not necessarily, but are optional, and the various embodiments are not implemented in combination, but may be implemented independently on the basis of the above-described examples.
As one preferred embodiment, the main tensile stress of each side surface of the support to be tested is calculated by the following formula:
in the formula, σ1The main tensile stress of a certain side face, E is the elastic modulus of the support to be measured, upsilon is the Poisson ratio of the support to be measured,45is the strain data for this side at 45 to the horizontal,135is the strain data for this side at 135 deg. to the horizontal,0for the strain data of the side in the horizontal direction,90is the strain data of the side in the vertical direction.
As one preferred embodiment, the main compressive stress of each side surface of the support to be tested is calculated by the following formula:
in the formula, σ2The main pressure stress of a certain side face, E is the elastic modulus of the support to be measured, upsilon is the Poisson ratio of the support to be measured,45is the strain data for this side at 45 to the horizontal,135is the strain data for this side at 135 deg. to the horizontal,0for the strain data of the side in the horizontal direction,90is the strain data of the side in the vertical direction.
As one preferred embodiment, the stressed state of the support to be tested is determined by the following steps:
s10, judging whether the main pressure stress of each side surface in the support to be tested is equal or not;
s20, when the main pressure stress of each side face in the support to be tested is judged to be equal, determining that no bias voltage occurs in the support to be tested;
s30, when the main compressive stresses of the side surfaces in the support to be tested are judged to be unequal, determining the bias voltage of the support to be tested, calculating the maximum value of the main compressive stresses of the side surfaces in the support to be tested, and taking the side surface corresponding to the maximum value as the bias voltage side of the support to be tested;
s40, judging whether the main tensile stress of each side surface in the support to be tested is equal to the main tensile stress of the opposite side surface;
s50, when the main tensile stress of each side face in the support to be tested is judged to be equal to the main tensile stress of the opposite side face, determining that the support to be tested is not inclined;
and S60, when the main tensile stress of one side surface is judged to be not equal to the main tensile stress of the opposite side surface, taking the side surface with the smaller main tensile stress of the side surface and the opposite side surface as the inclined side of the support to be tested.
It can be understood that the stress condition of the side surface of the support can be judged according to the main compressive stress of each side surface of the support to be tested, when the main compressive stresses of the side surfaces in the support to be tested are not equal, the support to be tested is indicated to generate bias voltage, at the moment, the maximum value of the main compressive stresses of the side surfaces in the support to be tested is calculated, and the bias voltage direction is indicated to be in four directionsThe side of the side face where the principal compressive stress is the greatest, for example, the principal compressive stresses of the respective faces calculated are σ2 side 1、σ2 side 2、σ2 side 3、σ2 side 4，Max[σ2 side 1,σ2 side 2,σ2 side 3,σ2 side 4]＝σ2 side 1It can be said that the bias direction is at the monitoring plane 1. The stress condition of the side surface of the support to be tested can also be judged according to the main tensile stress of each side surface of the support to be tested, for example, the main tensile stress of the east side and the main tensile stress of the west side are compared, if the main tensile stress of the east side is greater than that of the west side, the main tensile stress is the combination of normal stress and shear stress, the magnitude of the maximum stress of the side surface is reflected, and the support is inclined towards the direction of smaller main tensile stress according to the actual operation state of the support, so that the west side is taken as the inclined side of the support to be tested.
Wherein, due to measurement errors, when a certain data is within 5% of another data, the two data can be considered equal.
In the preferred embodiment, the stress condition of the support is judged according to the calculated main tensile stress and main compressive stress of each side surface of the support to be detected, the space stress state of the support can be obtained, possible diseases are explained from the stress state of the support structure, and the accuracy of safety monitoring is improved.
As one preferred embodiment, the fault analysis module 14 is specifically configured to:
when the strain data of a certain side surface is judged not to meet the preset conditions, calculating the shear stress of the side surface opposite to the side surface, and entering the next step;
according to the shearing stress and the preset error, obtaining an alignment check value, and entering the next step;
by the formula
Calculating to obtain a first value tau to be correctedmax1And judging the first value to be corrected taumax1If the alignment value is equal to the alignment value to be corrected, if so, entering the next step, and if not, determining that the failure result of the strain gauge is that the strain gauge is stuck to the alignment value to be correctedWhen the strain gauge on the side surface in the horizontal direction breaks down, sending the strain gauge fault result to the feedback unit, and finishing the fault analysis of the strain gauge on the side surface;
by the formula
Calculating to obtain a second value tau to be correctedmax2And judging the second value to be corrected taumax2If the error result of the strain gauge is not equal to the alignment value to be corrected, the next step is carried out, if not, the error result of the strain gauge is determined to be that the strain gauge which is pasted on the side surface and forms an included angle of 135 degrees with the horizontal direction has an error, the error result of the strain gauge is sent to the feedback unit, and the error analysis of the strain gauge on the side surface is finished;
by the formula
Calculating to obtain a third value tau to be correctedmax3And judging the third value tau to be correctedmax3If the error result of the strain gauge is not the same as the error result of the strain gauge stuck on the side surface in the vertical direction, the error result of the strain gauge is determined to be that the strain gauge stuck on the side surface has an error, the error result of the strain gauge is sent to the feedback unit, and the error analysis of the strain gauge on the side surface is finished;
by the formula
Calculating to obtain a fourth value tau to be correctedmax4And judging the fourth value tau to be correctedmax4If the error result of the strain gauge is not equal to the alignment value to be corrected, the next step is carried out, if not, the error result of the strain gauge is determined to be that the strain gauge which is pasted on the side surface and forms an angle of 45 degrees with the horizontal direction has an error, the error result of the strain gauge is sent to the feedback unit, and the error analysis of the strain gauge on the side surface is finished;
determining that the failure result of the strain gauge is that two or more of the four strain gauges stuck on the side surface have failed, sending the failure result of the strain gauge to the feedback unit, and finishing the failure analysis of the strain gauge on the side surface;
wherein the content of the first and second substances,
x1＝0，y1＝45+135-0，γxy1＝135-45；
45strain data of the side surface in a direction forming an included angle of 45 degrees with the horizontal direction;135strain data of the side surface in a direction forming an included angle of 135 degrees with the horizontal direction;0strain data of the side surface in the horizontal direction;90is the strain data of the side in the vertical direction.
It should be noted that, in practical application, the preset error may be set according to an actual situation, which does not affect the beneficial effects of the present invention, and optionally, the preset error is 5%, and the alignment check value includes a variation value of an amplitude of 2.5% of the shear stress.
Further, as an improvement of the above scheme, the shear stress of each side surface of the support to be tested is calculated by the following formula:
in the formula, τmaxThe shear stress of a certain side face is shown, E is the elastic modulus of the support to be measured, upsilon is the Poisson ratio of the support to be measured,45is the strain data for this side at 45 to the horizontal,135is the strain data for this side at 135 deg. to the horizontal,0is the side faceThe strain data in the horizontal direction is,90is the strain data of the side in the vertical direction.
In the preferred embodiment, the strain gauge adhered to the fan-shaped strain gage on the side surface is checked one by one to search the strain gauge with a fault in a directional manner, so that the fault result of the strain gauge on the side surface is determined, and the fault result of the strain gauge on the side surface is sent to the feedback unit 15, so that the feedback unit 15 feeds back the received fault result of the strain gauge, a worker can find the abnormal condition of the device in time and replace the fault strain gauge, and other strain gauge structures can be continuously used, therefore, the economic efficiency is certain, and the reliability of the device is ensured.
As one of the preferred embodiments, referring to fig. 3, the strain rosettes 21, 22 … 2n are connected to the analyzer 10 through wires;
the support safety monitoring device further comprises a protective wire box channel 6, wherein the protective wire box channel 6 is used for protecting a wire connecting the fan-shaped strain rosettes 21 and 22 … 2n and the analyzer 10.
In the preferred embodiment, the wire is directly exposed to the air and is easily damaged due to the influence of the external environment, so that the durability and reliability of the holder safety monitoring device are affected, and therefore, the wire connecting the strain sectors 21 and 22 … 2n and the analyzer 10 is protected by arranging the protective wire box 6, so that the durability and reliability of the holder safety monitoring device can be effectively improved, and the later maintenance cost can be reduced.
As one of the preferred embodiments, the feedback unit 15 is a display;
the display is used for displaying the received stress state so as to feed back the stress state to the user; and the strain gauge monitoring system is also used for displaying the received strain gauge fault result so as to feed back the strain gauge fault result to a user.
In the preferred embodiment, the feedback unit 15 is a display, and displays the received stress state and the strain gauge fault result, so that the stress state and the strain gauge fault result can be conveniently checked by the staff.
As one of the preferred embodiments, referring to fig. 2, each strain rosette is provided with a protective cover layer 5;
and the protective covering layer 5 is used for protecting the fan-shaped strain flowers.
In the preferred embodiment, the fan-shaped strain rosettes are directly exposed to the air due to the influence of the external environment, and the durability and the reliability of the fan-shaped strain rosettes can be influenced, so that the durability and the reliability of the support safety monitoring device can be effectively improved and the later maintenance cost can be reduced by arranging the protective covering layer 5 on the fan-shaped strain rosettes.
It will be appreciated that any combination of the above described preferred embodiments may be used to arrive at a more preferred embodiment of the invention.
When the support safety monitoring device provided by the embodiment of the invention is used for carrying out safety monitoring on a bridge support, the main pressure stress and the main tensile stress of each side surface of the support are calculated according to the strain data of each side surface of the support, and then the stress state of the support to be detected is determined according to the main pressure stress and the main tensile stress of each side surface, so that the spatial stress state can be analyzed from the self structure of the support, the problem that the accuracy of the monitored stress state of the support is low due to the fact that only the vertical stress state and the geometric deformation state of the support are monitored and the spatial property is not strong in the prior art is solved, the accuracy of the monitored stress state can be effectively improved, the reliability of the device is verified before the spatial stress state of the support is determined, the potential reliability hazard of the device can be timely found and fed back, and a worker can timely find and maintain the abnormal condition of the device, the problem of inaccurate monitoring result caused by low reliability of the device is avoided, and the accuracy of safety monitoring of the support can be effectively improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A support safety monitoring device is characterized by comprising an analyzer and a plurality of fan-shaped strain flowers; each fan-shaped strain rosette is correspondingly adhered to each side surface of the support to be tested;
each sector strain rosette comprises a strain gauge in the vertical direction, a strain gauge in the direction forming an included angle of 45 degrees with the horizontal direction, a strain gauge in the horizontal direction and a strain gauge in the direction forming an included angle of 135 degrees with the horizontal direction;
the fan-shaped strain rosette is used for measuring strain data of the side surface to which the fan-shaped strain rosette is adhered and sending the strain data to the analyzer;
the analyzer comprises a receiving unit, a judging unit, a stress analyzing unit, a fault analyzing unit and a feedback unit;
the receiving unit is used for receiving strain data of each side surface of the support to be tested;
the judging unit is used for judging whether the strain data of each side surface meets a preset condition or not;
the stress analysis unit is used for calculating the main compressive stress and the main tensile stress of each side surface according to the strain data of each side surface when the strain data of each side surface meet the preset conditions, determining the stress state of the support to be tested according to the main compressive stress and the main tensile stress of each side surface, and sending the stress state of the support to be tested to the feedback unit;
the fault analysis unit is used for calculating the shearing stress of the side surface opposite to the side surface when the strain data of the side surface is judged not to meet the preset condition, determining the fault result of the strain gauge of the side surface according to the shearing stress and the strain data of the side surface, and sending the fault result of the strain gauge to the feedback unit;
the feedback unit is used for feeding back the received stress state; and the device is also used for feeding back the received strain gauge fault result.
2. The mount safety monitoring device according to claim 1, wherein the predetermined condition is that45+135＝0+90；
Wherein the content of the first and second substances,45is the strain data for this side at 45 to the horizontal,135is the strain data for this side at 135 deg. to the horizontal,0for the strain data of the side in the horizontal direction,90is the strain data of the side in the vertical direction.
3. The support safety monitoring device according to claim 1, wherein the main tensile stress of each side surface of the support to be tested is calculated by the following formula:
in the formula, σ1The main tensile stress of a certain side face, E is the elastic modulus of the support to be measured, upsilon is the Poisson ratio of the support to be measured,45is the strain data for this side at 45 to the horizontal,135is the strain data for this side at 135 deg. to the horizontal,0for the strain data of the side in the horizontal direction,90is the strain data of the side in the vertical direction.
4. The support safety monitoring device according to claim 1, wherein the main compressive stress of each side surface of the support to be tested is calculated by the following formula:
in the formula, σ2The main pressure stress of a certain side face, E is the elastic modulus of the support to be measured, upsilon is the Poisson ratio of the support to be measured,45is the strain data for this side at 45 to the horizontal,135is the strain data for this side at 135 deg. to the horizontal,0for the strain data of the side in the horizontal direction,90is the strain data of the side in the vertical direction.
5. The support safety monitoring device according to claim 1, wherein the stress state of the support to be tested is determined by the following steps:
judging whether the main pressure stress of each side surface in the support to be tested is equal or not;
when the main pressure stress of each side face in the support to be tested is judged to be equal, determining that no bias voltage occurs in the support to be tested;
when the main compressive stresses of all the side surfaces in the support to be tested are judged to be unequal, determining the bias voltage of the support to be tested, calculating the maximum value in the main compressive stresses of all the side surfaces in the support to be tested, and taking the side surface corresponding to the maximum value as the bias voltage side of the support to be tested;
judging whether the main tensile stress of each side surface in the support to be tested is equal to the main tensile stress of the opposite side surface;
when the main tensile stress of each side face in the support to be tested is judged to be equal to the main tensile stress of the opposite side face, determining that the support to be tested is not inclined;
and when judging that the main tensile stress of a certain side face is not equal to the main tensile stress of the opposite side face, taking the side face with smaller main tensile stress in the side face and the opposite side face as the inclined side of the support to be tested.
6. The pedestal safety monitoring device according to claim 1, wherein the fault analysis module is specifically configured to:
when the strain data of a certain side surface is judged not to meet the preset conditions, calculating the shear stress of the side surface opposite to the side surface, and entering the next step;
according to the shearing stress and the preset error, obtaining an alignment check value, and entering the next step;
by the formula
Calculating to obtain a first value tau to be correctedmax1And judging the first value to be corrected taumax1If the error is not equal to the alignment value to be corrected, the next step is carried out, and if the error is not equal to the alignment value to be corrected, the error result of the strain gauge is determined to be that the strain gauge adhered to the side surface in the horizontal direction has an error, the error result of the strain gauge is sent to the feedback unit, and the error analysis of the strain gauge on the side surface is finished;
by the formula
Calculating to obtain a second value tau to be correctedmax2And judging the second value to be corrected taumax2If the error result of the strain gauge is not equal to the alignment value to be corrected, the next step is carried out, if not, the error result of the strain gauge is determined to be that the strain gauge which is pasted on the side surface and forms an included angle of 135 degrees with the horizontal direction has an error, the error result of the strain gauge is sent to the feedback unit, and the error analysis of the strain gauge on the side surface is finished;
by the formula
Calculating to obtain a third value tau to be correctedmax3And judging the third value tau to be correctedmax3If the error result of the strain gauge is not the same as the error result of the strain gauge stuck on the side surface in the vertical direction, the error result of the strain gauge is determined to be that the strain gauge stuck on the side surface has an error, the error result of the strain gauge is sent to the feedback unit, and the error analysis of the strain gauge on the side surface is finished;
by the formula
Calculating to obtain a fourth value tau to be correctedmax4And judging the fourth value tau to be correctedmax4If the error result of the strain gauge is not equal to the alignment value to be corrected, the next step is carried out, if not, the error result of the strain gauge is determined to be that the strain gauge which is pasted on the side surface and forms an angle of 45 degrees with the horizontal direction has an error, the error result of the strain gauge is sent to the feedback unit, and the error analysis of the strain gauge on the side surface is finished;
determining that the failure result of the strain gauge is that two or more of the four strain gauges stuck on the side surface have failed, sending the failure result of the strain gauge to the feedback unit, and finishing the failure analysis of the strain gauge on the side surface;
wherein the content of the first and second substances,
x1＝0，y1＝45+135-0，γxy1＝135-45；
e is the elastic modulus of the support to be measured, upsilon is the Poisson ratio of the support to be measured,45strain data of the side surface in a direction forming an included angle of 45 degrees with the horizontal direction;135strain data of the side surface in a direction forming an included angle of 135 degrees with the horizontal direction;0strain data of the side surface in the horizontal direction;90is the strain data of the side in the vertical direction.
7. Support safety monitoring device according to claim 1 or 6, wherein the shear stress of each side of the support to be tested is calculated by the following formula:
in the formula, τmaxThe shear stress of a certain side face is shown, E is the elastic modulus of the support to be measured, upsilon is the Poisson ratio of the support to be measured,45is the strain data for this side at 45 to the horizontal,135is the strain data for this side at 135 deg. to the horizontal,0for the strain data of the side in the horizontal direction,90is the strain data of the side in the vertical direction.
8. The pedestal safety monitoring device according to claim 1, wherein the strain rosettes are each connected to the analyzer by a wire;
the support safety monitoring device further comprises a protection wire box channel, and the protection wire box channel is used for protecting a wire connected with the fan-shaped strain rosette and the analyzer.
9. The pedestal safety monitoring device of claim 1, wherein the feedback unit is a display;
the display is used for displaying the received stress state so as to feed back the stress state to the user; and the strain gauge monitoring system is also used for displaying the received strain gauge fault result so as to feed back the strain gauge fault result to a user.
10. The mount safety monitoring device according to claim 1, wherein each fan-shaped strain gage is provided with a protective covering;
the protective covering layer is used for protecting the fan-shaped strain flowers.
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