CN111189600B - Method and device for detecting falling risk of point support plate - Google Patents
Method and device for detecting falling risk of point support plate Download PDFInfo
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- CN111189600B CN111189600B CN202010025390.3A CN202010025390A CN111189600B CN 111189600 B CN111189600 B CN 111189600B CN 202010025390 A CN202010025390 A CN 202010025390A CN 111189600 B CN111189600 B CN 111189600B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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- G01M7/025—Measuring arrangements
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Abstract
The invention discloses a method and a device for detecting falling risk of a point support plate, and belongs to the field of building plate falling risk detection. The back or side of the sheet material is hung to a support structure of the building body at a plurality of hanging points by hangers, the method comprising: exciting the board by using an excitation device, and collecting vibration signals of each hanging point on the front side of the board by using a vibration pickup sensor; obtaining the maximum vibration amplitude of each hanging point according to the oscillogram of the vibration signal, and selecting the minimum value of the maximum vibration amplitude, wherein the hanging point corresponding to the minimum value is a hanging firm point; comparing the maximum vibration amplitude of the hanging fixed point with other maximum vibration amplitudes, and judging whether other hanging points are loosened or detached according to the deviation of the maximum vibration amplitude; if any hanging point is loosened or hung off, the plate is in a falling risk. The invention can judge whether any hanging point has looseness or hanging-off phenomenon through simple excitation point supporting plates, and the method is simple, practical and easy to judge.
Description
Technical Field
The invention relates to the field of building board falling risk detection, in particular to a point support board falling risk detection method and device.
Background
With the development of economy in China, boards mainly comprising stone curtain wall panels, stone suspended ceilings, decorative boards and the like are widely applied to buildings. Taking stone curtain wall panels as an example, China is the country with the most building curtain walls, and as one of the main structural forms of the building curtain walls, the stone curtain wall panels are being applied to an outer enclosure structure by a large number of buildings.
The point support is a fixed connection form between the plate and a building main body support structure, and the back or the side of the plate is hung on the support structures such as a support keel of a building main body through a plurality of hanging points. Along with the increase of the application amount of the point supporting plates and the increase of the service life, the defects exist in the construction of partial point supporting plates, the integral falling accidents of the plates are caused to happen occasionally, and great hidden dangers are brought to the life and property safety of people. Therefore, in the safety evaluation of the building boards, it is necessary to detect and check the boards at risk of falling in advance, so as to prevent safety accidents from occurring.
Taking the stone curtain wall panel as an example, the point-supported stone curtain wall panel is called a dry-hanging stone curtain wall, and specifically includes a plug-type stone curtain wall, a slotted stone curtain wall, a back-plug type stone curtain wall, and the like. The dry-hanging stone curtain wall is characterized in that a groove or a hole is formed in the back or the edge of a stone curtain wall panel, and the stone panel is supported and fixed by a hanging piece. The pendant bears the weight of the stone panel and the action of external loads such as wind, vibration and the like, and once the hanging part between the pendant and the stone panel is loosened or hung off, the stone panel has larger potential risk of falling.
The hanging points of the point supporting plate are hidden behind or on the side edge (both the back and the side edge are invisible) of the plate, and whether the hanging points are off-hung or loosened can not be directly perceived through direct observation. At present, the conventional detection method is to disassemble part of the plate, and to observe the hanging condition of the back of the plate or the plate close to the back of the plate by naked eyes. However, the method is only suitable for local sampling detection, can not carry out complete detection, and detection is destructive detection, so that the plates in partial places are difficult to disassemble, and time and labor are wasted.
Journal paper "adopts dynamic method to evaluate the safety of stone curtain wall", Wang Yonghuan, et al, Sichuan architecture science research, Vol.40, No. 4, p.260-152,263, 20140831; a method for determining the falling risk of a stone panel by measuring the first-order natural frequency of the stone panel is provided. The master academic thesis of the institute of science and research of building materials in China "relative method-based assessment of coating thermal conductivity and stone curtain wall joint damage", Zhengdefu, 2019; a method for evaluating the falling risk of the stone curtain wall based on the relative change of the natural frequency is also provided.
However, the natural frequency of the stone panel is affected by many factors, which is likely to cause misjudgment, and it is difficult to judge whether the back or the side hanging pieces of the stone panel are loosened or fall off by measuring the natural frequency singly, and it is also impossible to judge which hanging piece is loosened or falls off.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and a device for detecting the falling risk of a point supporting plate.
The technical scheme provided by the invention is as follows:
a method of detecting the risk of a point support panel falling off, the back or side of the panel being hung at a plurality of hanging points by hangers to a support structure of a building body, the method comprising:
exciting the board by using an excitation device, and collecting vibration signals of each hanging point on the front side of the board by using a vibration pickup sensor;
obtaining the maximum vibration amplitude of each hanging point according to the oscillogram of the vibration signal, and selecting the minimum value of the maximum vibration amplitude of each hanging point, wherein the hanging point corresponding to the minimum value is regarded as a hanging firm point;
comparing the maximum vibration amplitude of the hanging fixed point with the maximum vibration amplitudes of other hanging points, and judging whether the other hanging points are loosened or detached according to the deviation;
if any hanging point is loosened or hung off, the plate is in a falling risk.
Further, the number of the vibration pickup sensors is the same as that of the hanging points;
wherein, use excitation device excitation panel to use pick up the vibration signal of shaking sensor openly gathering each hitch point department at panel, include:
arranging each vibration pickup sensor at a position corresponding to each hanging point on the front surface of the plate;
exciting the plate at an excitation point by using an excitation device, wherein the distance between the excitation point and each vibration pickup sensor is equal;
all vibration pickup sensors simultaneously acquire vibration signals at all hitching points.
Further, the number of the vibration pickup sensors is one;
use excitation device excitation panel to use pick up the vibration signal of shaking sensor openly gathering each hanging department at panel, include:
the following operations are executed for each hanging point according to the sequence:
arranging a vibration pickup sensor at a position corresponding to the hanging point on the front surface of the plate;
exciting the plate at an excitation point by using an excitation device, wherein the excitation force of the excitation device is fixed, and the distance between the excitation point and a vibration pickup sensor is fixed;
the vibration pickup sensor collects vibration signals at the hitching point.
Further, the step of comparing the maximum vibration amplitude of the hooking fastening point with the maximum vibration amplitudes of the other hooking points and judging whether the other hooking points are loosened or disengaged according to the deviation comprises:
if the deviation between the maximum vibration amplitude of the hanging fixed point and the maximum vibration amplitude of any other hanging point is within a first threshold range, enabling any other hanging point to be normal;
if the deviation between the maximum vibration amplitude of the hanging fixed point and the maximum vibration amplitude of any other hanging point is within a second threshold range, any other hanging point is loosened;
and if the deviation between the maximum vibration amplitude of the hanging fixed point and the maximum vibration amplitude of any other hanging point is within a third threshold range, then any other hanging point is hung off.
Further, the first threshold range is 0% to 15%, the second threshold range is 15% to 40%, and the third threshold range is greater than 40%.
Further, the vibration pickup sensor is a displacement sensor, a speed sensor or an acceleration sensor.
Furthermore, the vibration excitation device is a push-pull electromagnet.
Furthermore, a hanging groove or a hanging hole is formed in the back face or the side edge of the plate, one end of the hanging piece is connected with the plate in the hanging groove or the hanging hole, and the other end of the hanging piece is connected with the supporting keel through a connecting bolt.
A point support panel risk detection device that drops, the back or the side of panel are hung the bearing structure on the building subject through the pendant in a plurality of hitch points department, the device includes excitation device, picks up the sensor that shakes, signal processor and master control PC, wherein:
pick up sensor, signal processor and the master control PC that shakes and connect gradually, the excitation device is used for exciting the vibration to panel, pick up the sensor setting that shakes and connect the positive position that corresponds of point in panel for gather the vibration signal of hanging the point department, signal processor is used for handling vibration signal, obtains vibration signal's oscillogram, the master control PC is used for judging whether there is the risk of droing in panel according to each vibration signal's oscillogram.
Further, the device also comprises an alarm system, wherein the alarm system is connected with the master control PC and used for giving an alarm prompt when the plate has a falling risk;
the vibration pickup sensor is a displacement sensor, a speed sensor or an acceleration sensor, and the vibration excitation device is a push-pull electromagnet.
The invention has the following beneficial effects:
the invention can support the plate through the simple excitation point, can judge whether any hanging point has the phenomenon of loosening or hanging off through the vibration signal, has the advantages of simplicity, practicability and easy judgment, is particularly suitable for carrying out nondestructive comprehensive general inspection or spot inspection on the plate with the falling risk in the safety evaluation of the point support plate, and can judge the part with loosening or hanging off. The method provides a quantitative, accurate, nondestructive, simple and convenient to operate and economical and practical operation means for predicting and checking the plates with integral falling risks in the safety assessment work of the point support plates.
Drawings
FIG. 1 is a schematic view of a back-hanging manner of a stone panel;
FIG. 2 is a schematic view of a side portion hanging connection of a stone panel;
FIG. 3 is a schematic view of a device for detecting the risk of falling off of a point support plate according to the present invention;
FIG. 4 is a schematic diagram of a method for detecting the risk of dropping a point support plate according to the present invention;
FIG. 5 is a schematic view of the stone panel of FIG. 1 being hung by a hanger;
FIG. 6 is a schematic view of the stone panel of FIG. 2 being hung by a hanger;
FIG. 7 is a schematic view of the mounting position of the vibration pickup sensor and the vibration exciting point of the vibration exciting device corresponding to FIG. 5;
FIG. 8 is a schematic view of the mounting position of the vibration pickup sensor and the vibration exciting point of the vibration exciting device corresponding to FIG. 6;
FIG. 9 is a schematic diagram of a waveform of an acceleration signal and a corresponding maximum amplitude;
FIG. 10 is a waveform diagram of acceleration at the time of fastening of a hitch portion obtained by laboratory actual measurement;
FIG. 11 is a waveform diagram of acceleration at the time of unhooking of a hitching position obtained by laboratory actual measurement;
FIG. 12 is a waveform of acceleration at the time of fastening of a hitch portion obtained by actual measurement on site;
fig. 13 is a waveform diagram of acceleration at the time of unhooking of the hitching position obtained by actual measurement on site.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention provides a method for detecting the falling risk of a point support plate, wherein the point support is a fixed connection form between the plate and a support structure of a building main body, and the back or the side of the plate is hung on the support structures such as a support keel of the building main body through a plurality of hanging points.
The dry hanging type stone curtain wall is a typical structure of a point supporting plate, as shown in fig. 1 and 2, the back or side of a plate (stone panel) 1 is hung on a supporting keel 5 and other structures through hanging pieces 3 at a plurality of hanging points, so that the plate is installed and fixed.
When the hanging piece 3 is unhooked or loosened from the plate, a supporting weak point is formed at the position, and the possibility of falling off of the whole plate can be induced. Usually, there are at least 4 hang-up points per slab (some small slabs have only two hang-up points above and below, and some large slabs have 6 or more hang-up points).
Fig. 1 and 2 are the distance between the dry-hanging stone curtain walls, but the invention is not limited to the dry-hanging stone curtain walls, and can also be stone ceilings, decoration boards and other boards adopting point support form.
Once the plate is loosened or detached at a certain hanging point, the hanging point has no supporting and restraining effect of the hanging piece, and under the same external force, the vibration (displacement, speed, acceleration and the like) of the hanging point and the plate nearby the hanging point in the direction vertical to the plane of the plate can be obviously amplified compared with the vibration under the supporting and restraining effect of the hanging piece. Obviously, the looser the pendant is supported, the smaller the supporting and restraining force of the pendant on the hanging point is, the more obvious the vibration signal amplification effect is, and when the pendant is completely hung off, the supporting and restraining force of the pendant is zero, and the vibration signal amplification effect is maximum.
The invention adopts the principle to detect the falling risk of the point supporting plate, and as shown in fig. 3 and 4, the method for detecting the falling risk of the point supporting plate comprises the following steps:
s1: the sheet 1 is excited using the excitation device 6 and vibration signals at the respective hang-off points 12 are collected on the front side of the sheet 1 using the vibration pickup sensor 6.
The invention installs a vibration pickup sensor 6 at the corresponding position of the surface of the other side (front side) of the hanging part of the plate 1 and the hanging part 3, and adopts a vibration excitation device 7 to excite the stone panel 1 near the vibration pickup sensor 6 or at the center of the stone panel to make the stone panel vibrate freely, and measures the vibration signal (acceleration, speed or displacement signal) at the position through the vibration pickup sensor 6.
S2: and obtaining the maximum vibration amplitude of each hanging point according to the oscillogram of the vibration signal, and selecting the minimum value of the maximum vibration amplitudes of all the hanging points, wherein the hanging point corresponding to the minimum value is regarded as a hanging firm point.
After the vibration signal is processed by the signal processing device 8, a waveform diagram of the vibration signal is displayed, the maximum amplitude of the vibration signal is read out, and the minimum value of the maximum amplitude is selected.
At least one hanging point of a plurality of hanging points of any measured plate is completely hung, namely a hanging firm point, otherwise the plate cannot be fixed, and the amplitude of the vibration signal of the hanging point is minimum.
S3: and comparing the maximum vibration amplitude of the hanging fixed point with the maximum vibration amplitudes of other hanging points, and judging whether the other hanging points are loosened or detached according to the deviation of the maximum vibration amplitudes.
Because the hitching point corresponding to the minimum value of the maximum amplitude is complete, if the difference value between the other maximum amplitude and the minimum value of the maximum amplitude is small, the hitching point can be considered to be complete, and if the difference value is large, the hitching point can be considered to be loose or unhooked.
Specifically, the master control PC 9 (analysis software and the like) is used for comparative analysis, and a threshold value is set, so as to obtain whether the tested plate 1 has the phenomenon of hanging loosening or hanging off.
S4: if any hanging point is loosened or hung, the plate is in a falling risk, automatic alarm is carried out through the alarm system 10, and the plate is displayed to be in the falling risk.
In summary, after the board is excited to generate free vibration, the vibration pickup sensor is used for measuring the vibration signal oscillogram of each hanging point, and the mutual comparison is carried out according to the maximum value of the board vibration signal of each hanging point to determine whether the hanging point is loosened or unhooked, so as to determine whether the board has the risk of falling.
The invention can support the plate through the simple excitation point, can judge whether any hanging point has the phenomenon of loosening or hanging off through the vibration signal, has the advantages of simplicity, practicability and easy judgment, is particularly suitable for carrying out nondestructive comprehensive general inspection or spot inspection on the plate with the falling risk in the safety evaluation of the point support plate, and can judge the part with loosening or hanging off. The method provides a quantitative, accurate, nondestructive, simple and convenient operation and economical and practical operation means for predicting and checking the plates with integral falling risks in the safety evaluation work of point supporting plates (particularly stone curtain walls).
The present invention is not limited to the arrangement of the vibration pickup sensor and the manner of excitation by the excitation device, and two specific examples will be given below for illustration.
Example one:
in this example, the number of vibration pickup sensors 6 is the same as the number of hitch points 12, and a plurality of vibration pickup sensors are used to obtain vibration signals at each hitch point by one vibration excitation.
Taking the dry-hanging stone curtain wall shown in fig. 1 and 2 as an example, the stone curtain wall has 4 hanging points, and correspondingly, the vibration pickup sensors have 4.
In this case, S1 includes:
s11: the respective vibration pickup sensors 6 are disposed at respective hang-off points 12 at corresponding locations 11 on the front side of the sheet material as shown in fig. 5-8.
Fig. 5 is a back hanging schematic view of the dry hanging type stone curtain wall shown in fig. 1, and fig. 6 is a side hanging schematic view of the dry hanging type stone curtain wall shown in fig. 2. The 4 hanging points of the stone panel are numbered as (I), (II), (III) and (IV).
Fig. 7 is a front view of the dry hanging type stone curtain wall shown in fig. 1, and fig. 8 is a front view of the dry hanging type stone curtain wall shown in fig. 2. The vibration pickup sensors are respectively arranged at the corresponding 4 sensor installation positions 11 (I), (II), (III) and (IV) on the front surface of the stone panel.
S12: the plate is excited at an excitation point 13 by using an excitation device 7, and the distance between the excitation point 13 and each vibration pickup sensor 6 is equal.
In the step, the stone panel is subjected to transient triggering and vibration excitation by adopting a vibration excitation device at the position (generally at the central part of the stone panel) with the same distance from 4 acceleration sensors, so that the stone panel generates free vibration.
S13: all vibration pickup sensors 6 simultaneously pick up vibration signals at each of the hang-off points 12.
The 4 acceleration sensors receive the vibration signal, and output an acceleration change waveform chart after being processed by the signal processing device 8, wherein a typical waveform change chart is shown in fig. 9, wherein an a value corresponding to a vertical coordinate is a maximum amplitude of the vibration signal (an acceleration value or a voltage value corresponding thereto).
Example two:
in this example, the number of the vibration pickup sensors 6 is one, and one vibration pickup sensor is adopted to obtain vibration signals at each hitching point through multiple times of vibration excitation.
In this case, S1 includes:
the following operations are executed for each hanging point according to the sequence:
s11': the vibration pickup sensor 6 is arranged at a position 11 corresponding to the hanging point 12 on the front surface of the plate material.
S12': the plate 1 is excited at an excitation point 13 by using an excitation device 7, wherein the excitation force of the excitation device 7 is fixed, the distance between the excitation point 13 and the vibration pickup sensor 6 is fixed, and the excitation force of each excitation is ensured to be the same, and the distance between the excitation point and the vibration pickup sensor is the same. The vibration can be excited near the installation of the vibration pickup sensor, and the vibration can also be excited in the center of the plate.
S13': the vibration pickup sensor 6 collects vibration signals at the point of hitch 12.
Specifically, in the example, the vibration pickup sensor is firstly installed at the corresponding position 11 of the first hanging point, and the vibration excitation device is adopted to carry out transient triggering vibration excitation on the stone panel and collect the vibration signal of the first hanging point. After the first hanging point is measured, the second hanging point is measured, and the like, but the excitation force and the distance between the excitation position of each hanging point and the installation position of the vibration pickup sensor are ensured to be equal during each measurement.
The present invention S3 includes:
if the deviation between the maximum vibration amplitude of the hanging fixed point and the maximum vibration amplitude of any other hanging point is within a first threshold range, enabling any other hanging point to be normal;
if the deviation between the maximum vibration amplitude of the hanging fixed point and the maximum vibration amplitude of any other hanging point is within a second threshold range, any other hanging point is loosened;
and if the deviation between the maximum vibration amplitude of the hanging fixed point and the maximum vibration amplitude of any other hanging point is within a third threshold range, then any other hanging point is hung off.
The first threshold range is 0% -15%, the second threshold range is 15% -40%, and the third threshold range is greater than 40%. The values of the threshold ranges are only examples, and the threshold range change caused by different support forms of the sheet materials is also within the protection scope of the invention.
Specifically, taking the dry-hanging type stone curtain wall shown in fig. 1 or fig. 2 as an example, at least one of the 4 hanging points of any measured stone panel is completely hung (otherwise, the stone panel cannot be fixed on the curtain wall), and the vibration acceleration signal value of the hanging point is the minimum. In order to judge which of the 4 hanging positions is loosened or hung off, the following method is adopted:
firstly, according to the obtained vibration oscillogram of the stone panel at 4 hitching points, respectively reading out the maximum amplitude A of the vibration signal1、A2、A3、A4Selecting a minimum value of the 4 values, comparing the minimum value with the remaining 3 values, judging that the 4 hanging points are not hung or loosened when the deviation between any value of the remaining 3 values and the minimum value (the deviation between any value of the remaining 3 values and the minimum value is reduced and then the percentage obtained by dividing the minimum value is less than 15 percent (which can be caused by uneven installation), judging that the hanging points corresponding to one or more values are loosened when the deviation between any value or more values of the remaining 3 values and the minimum value is between 15 percent and 40 percent, and judging that the hanging points corresponding to one or more values are hung when the deviation between any value or more values of the remaining 3 values and the minimum value is more than 40 percent. And setting an alarm threshold value according to the judgment standard, namely judging that the stone panel has the falling risk if any one or more hanging points have the falling phenomenon in the 4 measured points.
The vibration pickup sensor 6 of the present invention is a displacement sensor, a velocity sensor or an acceleration sensor, and is preferably an acceleration sensor. The vibration excitation device 7 can be a push-pull electromagnet or other vibration excitation devices which can realize the same vibration excitation force every time, and the push-pull electromagnet carries out impact excitation on the plate.
In order to prove the detection effect of the embodiment of the invention, the detection is respectively carried out in a laboratory and on a stone curtain wall site, and one hanging point is intentionally hung off manually to measure the maximum amplitude of the vibration acceleration signal, and the measurement results are shown in tables 1 and 2.
Table 1: hanging part obtained by laboratory actual measurement
Table 2: hanging part obtained by on-site actual measurement of curtain wall
According to the actual measurement results of tables 1 and 2, the judgment result by the method of the present invention is consistent with the actual result.
The invention is particularly suitable for stone curtain walls, the structure of the stone curtain wall is shown in figures 1 and 2, a hanging groove or a hanging hole 2 is arranged on the back or the side edge of a plate (a stone curtain wall panel) 1, one end of a hanging piece 3 is connected with the plate 1 in the hanging groove or the hanging hole 2, and the other end of the hanging piece 3 is connected with a supporting keel 5 through a connecting bolt 4.
The embodiment of the invention also provides a device for detecting the falling risk of the point support plate, which is shown in the figures 1-3. The back or side of the panel 1 is hung to the supporting structure of the building body by the hanging pieces 3 at a plurality of hanging points 12, the point supporting panel falling risk detecting device comprises an excitation device 7, a vibration pickup sensor 6, a signal processor 8 and a main control PC 9, wherein:
the vibration pickup sensor 6, the signal processor 8 and the main control PC 9 are sequentially connected, the vibration excitation device 7 is used for exciting vibration to the plate 1, the vibration pickup sensor 6 is arranged at a position corresponding to the front surface of the plate 1 at the hanging point 12 and used for collecting vibration signals at the hanging point 12, the signal processor 8 is used for processing the vibration signals to obtain a waveform diagram of the vibration signals, and the main control PC 9 is used for judging whether the plate 1 has a falling risk according to the waveform diagram of each vibration signal.
The device can support the plate through the simple excitation point, can judge whether any hanging point has looseness or hanging-off phenomenon through the vibration signal of the plate, is simple, practical and easy to judge, is particularly suitable for carrying out nondestructive comprehensive general inspection or spot inspection on the plate with the falling risk in the safety evaluation of the point-supported plate, and can judge the looseness or hanging-off part. The method provides a quantitative, accurate, nondestructive, simple and convenient operation and economical and practical operation means for predicting and checking the plates with integral falling risks in the safety evaluation work of point supporting plates (particularly stone curtain walls).
The point support plate falling risk detection device further comprises an alarm system 10, wherein the alarm system 10 is connected with the main control PC 9 and used for giving an alarm prompt when the plate 1 has a falling risk.
The vibration pickup sensor 6 can be a displacement sensor, a speed sensor or an acceleration sensor, and the vibration excitation device 7 can be a push-pull electromagnet or other vibration excitation devices which can realize the same vibration excitation force every time.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A method for detecting the risk of falling off of a point-supported sheet material, the back or side of which is hung by hangers to a supporting structure of a building body at a plurality of hanging points, the method comprising:
exciting the board by using an excitation device, and collecting vibration signals of each hanging point on the front side of the board by using a vibration pickup sensor;
obtaining the maximum vibration amplitude of each hanging point according to the oscillogram of the vibration signal, and selecting the minimum value of the maximum vibration amplitude of each hanging point, wherein the hanging point corresponding to the minimum value is regarded as a hanging firm point;
comparing the maximum vibration amplitude of the hanging fixed point with the maximum vibration amplitudes of other hanging points, and judging whether the other hanging points are loosened or detached according to the deviation;
if any one hanging point is loosened or hung off, the plate has a falling risk;
wherein, will articulate the biggest vibration amplitude of firm point and carry out the comparison with the biggest vibration amplitude of other hitching point, judge according to its deviation whether other hitching points are not hard up or take off the hanging, include:
if the deviation between the maximum vibration amplitude of the hanging fixed point and the maximum vibration amplitude of any other hanging point is within a first threshold range, enabling any other hanging point to be normal;
if the deviation between the maximum vibration amplitude of the hanging fixed point and the maximum vibration amplitude of any other hanging point is within a second threshold range, any other hanging point is loosened;
and if the deviation between the maximum vibration amplitude of the hanging fixed point and the maximum vibration amplitude of any other hanging point is within a third threshold range, then any other hanging point is hung off.
2. The method for detecting the risk of dropping off a point support plate according to claim 1, wherein the number of the vibration pickup sensors is the same as the number of the hitching points;
wherein, use excitation device excitation panel to use pick up the vibration signal of shaking sensor openly gathering each hitch point department at panel, include:
arranging each vibration pickup sensor at a position corresponding to each hanging point on the front surface of the plate;
exciting the plate at an excitation point by using an excitation device, wherein the distance between the excitation point and each vibration pickup sensor is equal;
all vibration pickup sensors simultaneously acquire vibration signals at all hitching points.
3. The method for detecting the risk of peeling off a point support plate according to claim 1, wherein the number of the vibration pickup sensors is one;
use excitation device excitation panel to use pick up the vibration signal of shaking sensor openly gathering each hanging department at panel, include:
the following operations are executed for each hanging point according to the sequence:
arranging a vibration pickup sensor at a position corresponding to the hanging point on the front surface of the plate;
exciting the plate at an excitation point by using an excitation device, wherein the excitation force of the excitation device is fixed, and the distance between the excitation point and a vibration pickup sensor is fixed;
the vibration pickup sensor collects vibration signals at the hitching point.
4. The method for detecting the falling risk of the point support plate according to any one of claims 1 to 3, wherein the first threshold value range is 0% to 15%, the second threshold value range is 15% to 40%, and the third threshold value range is more than 40%.
5. The method for detecting the risk of peeling off a point support plate according to claim 4, wherein the vibration pickup sensor is a displacement sensor, a velocity sensor or an acceleration sensor.
6. The method for detecting the risk of peeling off of the point support plate according to claim 5, wherein the excitation device is a push-pull electromagnet.
7. The method for detecting the falling risk of the point support plate according to claim 6, wherein a hanging groove or a hanging hole is formed in the back surface or the side edge of the plate, one end of the hanging piece is connected with the plate in the hanging groove or the hanging hole, and the other end of the hanging piece is connected with the support keel through a connecting bolt.
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| CN107314792A (en) * | 2017-07-06 | 2017-11-03 | 中山大学 | A kind of glass curtain wall safety monitoring system and monitoring method |
| CN109000873B (en) * | 2018-06-07 | 2020-02-04 | 西南交通大学 | Bolt loosening life prediction method |
| CN109520688A (en) * | 2018-11-15 | 2019-03-26 | 北京科技大学 | Building curtain wall safe condition remote detecting method based on vibration measurement with laser technology |
| CN109959709B (en) * | 2019-03-06 | 2021-11-05 | 中国建筑科学研究院有限公司 | Sealant damage identification method for boundary structure of full-hidden frame glass curtain wall |
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