Crack monitoring device of building structure

Abstract

The utility model discloses a crack monitoring device of a building structure, and relates to the technical field of building structure health monitoring, in particular to a crack monitoring device of a building structure, which comprises a three-fold main support plate and an auxiliary support plate, the three-fold main support plate comprises a bottom plate, a one-fold vertical plate, a two-fold horizontal plate and a three-fold vertical plate, a positioning ring is installed above the two-fold horizontal plate through threads, and a detachable detection head is installed above the positioning ring through threads. Through cooperative arrangement of the three-fold main support plate, the detection head, the field detector and the wireless signal device, the crack monitoring device of the building structure has the effects that the pictures which are the same as the field detection can be transmitted back in subsequent monitoring, the field condition can be remotely judged in the subsequent process, and on-site running is reduced; through cooperative arrangement of the detection head, the displacement sensor and the cross identifier, the crack monitoring device of the building structure has the effects of monitoring multi-aspect data changes and improving the information feedback accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of building structure health monitoring, in particular to a crack monitoring device for building structures. Background Technique

[0002] During the construction and operation of building structures, due to the influence of various adverse factors, the building structures will undergo uneven settlement and then produce certain deformation. When the deformation reaches a certain threshold, cracks will appear in some relatively weak and heavily loaded components of the building structure, which may further lead to component fracture, structural inclination and collapse, endangering the lives and property safety of the people. However, it is not necessary to immediately stop using the building once settlement, inclination and cracks occur in the building structure. In the case of little significant change in the surrounding environment, the deformation of the building structure will tend to be stable within a certain period of time. At this time, settlement, inclination and cracks may no longer continue to develop and the degree of harm is relatively small. After filling the building cracks and correcting the inclination through certain technical means, the building can still be used normally. Therefore, after the building structure has inclination and cracks due to uneven settlement, in order to timely understand the development of inclination and cracks, predict the development trend of inclination and cracks, and evaluate the safety status of the building, it is very necessary to monitor and warn the settlement, inclination and cracks of the building structure.

[0003] Traditional crack monitoring generally involves the inspector going to the site to accurately detect through a probe, take pictures and record data, and then installing sensors at the position with the largest crack to monitor the crack changes in real time. After the sensors detect that the crack has become larger, the inspector arrives at the site again to record data. The above detection methods and devices have some deficiencies. On the one hand, the on-site detection and subsequent monitoring do not use the same detection method. After a long time span, the inspector himself forgets what the crack originally looked like, or there are difficulties in work handover, resulting in the need to arrive at the site to determine the on-site situation when the data collected by the subsequent sensors changes. On the other hand, the data collected by the sensors in the subsequent monitoring can only obtain the data changes in a single direction, resulting in inaccurate information feedback. Content of the Utility Model

[0004] (I) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the utility model provides a crack monitoring device for building structures, which solves the problems put forward in the above background technique.

[0006] (II) Technical Solutions

[0007] To achieve the above object, the utility model is realized by the following technical solutions: A crack monitoring device for a building structure, comprising a three-fold main support plate and a sub-support plate. The three-fold main support plate includes a bottom plate, a first-fold vertical plate, a second-fold horizontal plate, and a third-fold vertical plate. Above the second-fold horizontal plate, a positioning ring is installed by means of a thread. Above the positioning ring, a detachable detection head is installed by means of a thread. The detection head is connected to a on-site detector or a wireless signal device through a cable. On the side of the third-fold vertical plate, a displacement sensor is fixedly installed by means of a screw. The sub-support plate includes a monitoring data generating plate fixedly installed by means of a screw above one end close to the three-fold main support plate. On one side of the monitoring data generating plate close to the three-fold main support plate, a cross mark is provided.

[0008] Preferably, the three-fold main support plate and the sub-support plate are installed on a straight line. On the outer sides of the bottom plate of the three-fold main support plate and the sub-support plate, two through holes with a certain distance are provided. The three-fold main support plate and the sub-support plate are respectively fixedly installed on both sides of the crack through the through holes in cooperation with expansion bolts. The cross mark is located at the middle position of the crack.

[0009] Preferably, the sub-support plate is installed on the higher side of the crack. The monitoring data generating plate is located below the second-fold horizontal plate and they are in a parallel relationship. The distance between the monitoring data generating plate and the second-fold horizontal plate is determined by the height of the first-fold vertical plate.

[0010] Preferably, the material of the monitoring data generating plate is smooth-surface transparent organic glass or stainless steel. The probe of the displacement sensor faces vertically downward and contacts the monitoring data generating plate. The displacement sensor is connected to the wireless signal device through a cable. The wireless signal device transmits the reading of the displacement sensor outward by radio.

[0011] Preferably, the monitoring data generating plate is fixedly connected to the sub-support plate through long waist holes in cooperation with screws. The center of the cross mark is directly below the center of the positioning ring. The cross mark is provided with scales in four directions with the center as the zero point.

[0012] Preferably, a camera is installed at the central position inside the detection head. LED lights are installed around the camera. A display screen is provided on the on-site detector and the crack can be directly seen through the camera. The wireless signal device can transmit the photos taken by the camera outward by radio.

[0013] The utility model provides a crack monitoring device for a building structure, having the following beneficial effects:

[0014] 1. The crack monitoring device for the building structure, through the cooperative setting of the three-fold main support plate, the detection head, the on-site detector and the wireless signal device, enables the crack monitoring device for the building structure to have the effect that the subsequent monitoring can transmit the same picture as the on-site detection, facilitating subsequent remote judgment of the on-site situation and achieving the effect of reducing on-site visits. The detection head is fixedly installed above the crack through the three-fold main support plate, and the on-site detector and the wireless signal device share the same detection head. Therefore, the subsequent detection can receive the same picture as the on-site detection, and further facilitates the monitoring personnel to compare the historical on-site photos with the transmitted pictures, thus facilitating subsequent remote judgment of the on-site situation and achieving the effect of reducing on-site visits.

[0015] 2. The crack monitoring device for the building structure, through the cooperative setting of the detection head, the displacement sensor and the cross mark, enables the crack monitoring device for the building structure to have the effect of monitoring the changes in multiple aspects of data and improving the accuracy of information feedback. Since the detection head can use the cross mark and the scales on it as a reference object to observe the crack when photographing the crack, it is convenient to observe the changes in the displacement of the building on both sides of the crack in the front, back, left and right directions. The displacement sensor can monitor the changes in the height of the buildings on both sides of the crack, and thus can monitor the changes in multiple aspects of data to improve the accuracy of information feedback. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the layout top view of the present utility model;

[0017] Figure 2 It is a schematic structural diagram of the front view of the present utility model;

[0018] Figure 3 It is a schematic structural diagram of the installation top view of the support of the present utility model;

[0019] Figure 4 It is a schematic structural diagram of the three-dimensional view of the present utility model;

[0020] Figure 5 It is a schematic structural diagram of the cross-sectional view of the present utility model.

[0021] In the figure: 1. Three-fold main support plate; 101. Bottom plate; 102. First-fold vertical plate; 103. Second-fold horizontal plate; 104. Third-fold vertical plate; 2. Sub-support plate; 3. Positioning ring; 4. Detection head; 5. On-site detector; 6. Wireless signal device; 7. Displacement sensor; 8. Monitoring data generating plate; 801. Cross mark. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Embodiment

[0023] Please refer to Figures 1 to 5 , the present utility model provides a technical solution: a crack monitoring device for a building structure, including a three-fold main support plate 1 and a sub-support plate 2. The three-fold main support plate 1 includes a bottom plate 101, a first-fold vertical plate 102, a second-fold horizontal plate 103 and a third-fold vertical plate 104. Above the second-fold horizontal plate 103, a positioning ring 3 is installed by threading, and above the positioning ring 3, a detachable detection head 4 is installed by threading. The detection head 4 is connected to a field detector 5 or a wireless signal device 6 through a cable. On the side of the third-fold vertical plate 104, a displacement sensor 7 is fixedly installed by screws. The sub-support plate 2 includes a monitoring data generating plate 8 fixedly installed by screws above one end close to the three-fold main support plate 1. On one side of the monitoring data generating plate 8 close to the three-fold main support plate 1, a cross mark 801 is provided.

[0024] Specifically, the models of the detection head 4 and the field detector 5 can be the HC-CK101 intelligent crack width observation instrument, and the wireless signal device 6 is a commonly used wireless transceiver module, and the model can be RM500Q-GL. Sockets are installed above both the detection head 4 and the displacement sensor 7. A cable plug connected to the detection head 4 is provided on the field detector 5, and cable plugs connected to the detection head 4 and the displacement sensor 7 are provided on the wireless signal device 6. The field detector 5 is equipped with a built-in battery and is operated on-site by staff. The staff observes the photos transmitted back by the detection head 4 through the display screen of the field detector 5 and records the specific situation of the crack at that time. The wireless signal device 6 draws power nearby or is equipped with a solar panel to draw power or is powered by a battery, that is, the wireless signal device 6 has a built-in battery and also has a charging port. If there is a power source at the detection site, the power supply can be plugged in to continuously maintain the power. If there is no power source at the site but there is sunlight during the day, a solar panel can be installed to charge it to maintain the power. If there is neither a power source nor sunlight at the site, then the staff needs to make a record and then go to the site according to the recorded address to replace the battery with insufficient power. The battery power can also be sent to the monitoring platform through the wireless signal device 6. The crack monitoring device is fixedly installed above the maximum width of the crack and is as perpendicular to the crack as possible. When the staff arrives at the site, they need to bring multiple three-fold main support plates 1 with different height dimensions of the first-fold vertical plates 102 and different length dimensions of the second-fold horizontal plates 103, and then select a suitable three-fold main support plate 1 for installation according to the width and height difference of the crack.

[0025] Please refer to Figures 1 to 2 , the three-fold main support plate 1 and the sub-support plate 2 are installed on a straight line. Two through holes with a certain distance are opened on the outer sides of the bottom plate 101 of the three-fold main support plate 1 and the sub-support plate 2. The three-fold main support plate 1 and the sub-support plate 2 are respectively fixedly installed on both sides of the crack through the through holes and expansion bolts. The cross mark 801 is located in the middle of the crack.

[0026] Specifically, the triple-fold main support plate 1 and the auxiliary support plate 2 are installed in a straight line and perpendicular to the crack. The spacing of the expansion bolts is more than 50 mm to achieve firm installation. When installing, four holes need to be drilled on the buildings on both sides of the crack and then fixed through the expansion bolts. The position of the cross mark 801 is adjusted through the long waist hole on the monitoring data generating plate 8.

[0027] Please refer to Figure 2 , the auxiliary support plate 2 is installed on the side with the higher crack. The monitoring data generating plate 8 is located below the double-fold horizontal plate 103 and they are parallel to each other. The spacing between the monitoring data generating plate 8 and the double-fold horizontal plate 103 is determined by the height of the single-fold vertical plate 102.

[0028] Specifically, the length and width dimensions of the cross mark 801 are often larger than the width of the crack. Installing the auxiliary support plate 2 on the side with the higher crack can prevent the cross mark 801 from hitting the inner side of the crack. The monitoring data generating plate 8 is located below the double-fold horizontal plate 103 and they are parallel to each other, which allows the detection head 4 to photograph the cross mark 801 and the crack below from directly above, so as to clearly photograph the position relationship between the scale on the cross mark 801 and the edge of the crack. Since the focus of the camera inside the detection head 4 has a certain range value, it is necessary to use the single-fold vertical plate 102 with a suitable height dimension to adjust the spacing between the detection head 4 and the monitoring data generating plate 8 to adapt to cracks with different height differences, so that the camera can clearly photograph the scale on the cross mark 801.

[0029] Please refer to Figures 1 to 4 , the material of the monitoring data generating plate 8 is smooth transparent organic glass or stainless steel. The probe of the displacement sensor 7 faces vertically downward and contacts the monitoring data generating plate 8. The displacement sensor 7 is connected to the wireless signal device 6 through a cable. The wireless signal device 6 transmits the reading of the displacement sensor 7 outward by radio. The monitoring data generating plate 8 is fixedly connected to the auxiliary support plate 2 through a long waist hole and screws. The center of the cross mark 801 is directly below the center of the positioning ring 3. The cross mark 801 is provided with scales in four directions with the center as the zero point.

[0030] Specifically, if the material of the monitoring data generating board 8 is plexiglass, the width of the cross mark 801 needs to be made thicker to increase its strength, and the color of the scale also needs to be made lighter so that the detection head 4 can capture the edge of the crack through the cross mark 801. If the material of the monitoring data generating board 8 is stainless steel, the width of the cross mark 801 needs to be made very thin to avoid blocking the detection head 4 from taking pictures. At this time, since the scale length is shorter, the color needs to be darker. The smooth surface of the monitoring data generating board 8 can reduce the friction between the probe of the displacement sensor 7 and it, which can prevent the probe from tilting when the crack width changes, resulting in the value not reflecting the real situation. The probe of the displacement sensor 7 is vertically downward also to enable the probe to truly reflect the change in the height difference between the building bodies on both sides of the crack. During installation, the position of the cross mark 801 is adjusted through the long oval hole so that the center of the cross mark 801 is located at the middle position below the detection head 4, enabling the scales in four directions to better measure the crack.

[0031] Please refer to Figure 1 and Figure 5 , a camera is installed at the central position inside the detection head 4, and LED lights are installed around the camera. A display screen is set on the on-site detector 5, and the crack can be directly seen through the camera. The wireless signal device 6 can transmit the photos taken by the camera outward via radio.

[0032] Specifically, the LED lights automatically turn on for supplementary lighting when the camera takes pictures. The pictures taken can be either actively taken regularly or taken again when the data of the displacement sensor 7 changes. Regular shooting is applicable when the crack is unstable in the early stage, and taking pictures again when the data of the displacement sensor 7 changes is applicable when the crack is stable in the later stage. The two detection modes can be used in combination, that is, the camera takes pictures regularly for a long time. Once the data of the displacement sensor 7 changes, the interval of the camera's regular shooting is greatly reduced and continuous shooting is carried out for a period of time before returning to the original long timing. The data transmitted outward via radio is received and monitored by the detection personnel.

[0033] During use, after the inspector arrives at the site, first find the position where the crack is widest and there is enough space to install the crack monitoring device. Then draw a straight line perpendicular to the crack. Further, pre-install the monitoring data generating board 8 onto the secondary support board 2. At this time, it is required that the monitoring data generating board 8 and the secondary support board 2 are in a straight line and the tightened screw is located at the middle position of the long oval hole. Further, press the secondary support board 2 tightly against the higher side of the cracked building body. If the building bodies on both sides of the crack are of the same height, then install it on either side randomly. Further, adjust the position of the secondary support board 2 by sliding so that the cross mark 801 is located in the middle of the crack and the originally drawn line passes through the exact middle of the installation hole of the secondary support board 2. Then mark the two points for drilling holes for installing the secondary support board 2 with a pen. Further, install the positioning ring 3 onto the double-folded horizontal plate 103 by threading and fix it with thread glue to prevent it from loosening. Further, mark the drilling positions for the triple-folded main support board 1 on the other side of the crack in the same way. It is required that the center of the positioning ring 3 is concentric with the center of the cross mark 801. Further, drill holes at the marked positions with an electric drill. Further, fix and install the triple-folded main support board 1 and the secondary support board 2 on both sides of the crack respectively through expansion bolts. Further, screw the detection head 4 into the positioning ring 3 and connect it to the on-site detector 5. Further, loosen the screw fixing the monitoring data generating board 8 and re-adjust the position of the cross mark 801. Specifically, the inspector observes the position of the center of the cross mark 801 through the display screen on the on-site detector 5. When the cross mark 801 is located at the middle position of the screen, tighten the screw again to fix the monitoring data generating board 8. Further, the inspector operates the camera and LED lamp inside the detection head 4 through the on-site detector 5 to take a photo that can clearly show the scale on the cross mark 801 and the edge of the crack. Then save the photo and measure the width of the crack through the photo. Further, install the displacement sensor 7 on one side of the triple-folded vertical plate 104. At this time, it is required that the probe of the displacement sensor 7 retracts halfway. Further, measure the height difference between the building bodies on both sides of the crack with a ruler or a square. Further, unscrew the connection cable between the on-site detector 5 and the detection head 4. Further, connect the cable of the wireless signal device 6 to the detection head 4 and the displacement sensor 7. Further, fix and install the wireless signal device 6 at a suitable position and connect it to the detection system. Further, read the image uploaded by the wireless signal device 6 and the reading of the displacement sensor 7 through the detection system, and record the reading of the displacement sensor 7 at this time as the value of the height difference just measured. Subsequently, the images uploaded by the wireless signal device 6 and the readings of the displacement sensor 7 are automatically compared with the height difference measured and photographed by the inspector on-site. The automatic image comparison is equivalent to finding differences in pictures or overlapping images for comparison, which is a very simple visual judgment program. The wireless signal device 6 automatically identifies once every time it uploads. The upload frequencies of the pictures and the sensor are determined according to the situation of the crack. The more dangerous the crack is, the higher the upload frequency can be, up to several times per second. On the contrary, the safer the crack is, the lower the upload frequency can be, which can be once every half hour.After automatically identifying the differences, an alarm signal is sent to the inspectors. Then, the inspectors view the just-uploaded pictures and data and compare them with the previous on-site inspection results. If there is a risk, they immediately go to the site to check. If there is no risk, they continue to monitor.

[0034] In summary, the crack monitoring device for the building structure fixes the detection head 4 above the crack through the triple-fold main support plate 1. Moreover, the on-site detector 5 and the wireless signal device 6 share the same detection head 4. Therefore, the subsequent inspection can receive the same picture as the on-site inspection, which is convenient for the monitoring personnel to compare the historical on-site photos with the transmitted pictures. Thus, it is convenient to remotely judge the on-site situation subsequently and achieve the effect of reducing on-site visits. Since the detection head 4 can use the cross mark 801 and the scales above as references to observe the crack when photographing the crack, it is convenient to observe the changes in the displacement of the buildings on both sides of the crack in the front, back, left, and right directions. The displacement sensor 7 can monitor the changes in the building heights on both sides of the crack, and thus can monitor the changes in various data aspects to improve the accuracy of information feedback.

[0035] The above is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. A crack monitoring device for a building structure, comprising a three-fold main support plate (1) and a secondary support plate (2), characterized in that: The three-fold main support plate (1) comprises a bottom plate (101), a one-fold vertical plate (102), a two-fold horizontal plate (103) and a three-fold vertical plate (104); a positioning ring (3) is installed on the top of the two-fold horizontal plate (103) by means of a thread; a detachable detection head (4) is installed on the top of the positioning ring (3) by means of a thread; the detection head (4) is connected to an on-site detector (5) or a wireless signal device (6) by means of a cable; a displacement sensor (7) is fixedly installed on the side of the three-fold vertical plate (104) by means of screws; the auxiliary support plate (2) comprises a monitoring data generating plate (8) fixedly installed on the top of one end of the three-fold main support plate (1) by means of screws; a cross mark (801) is provided on the side of the monitoring data generating plate (8) close to the three-fold main support plate (1).

2. The crack monitoring device for a building structure according to claim 1, characterized in that: The three-fold main support plate (1) and the auxiliary support plate (2) are installed in a straight line. The bottom plate (101) of the three-fold main support plate (1) and the outer side of the auxiliary support plate (2) are each provided with two through holes with a certain interval. The three-fold main support plate (1) and the auxiliary support plate (2) are respectively fixed on both sides of the crack through the through holes and expansion bolts. The cross mark (801) is located in the middle of the crack.

3. The crack monitoring device for a building structure according to claim 1, characterized in that: The auxiliary support plate (2) is installed on the side where the crack is higher, the monitoring data generating plate (8) is located below the two-fold horizontal plate (103) and the two are in a parallel relationship, and the spacing between the monitoring data generating plate (8) and the two-fold horizontal plate (103) is determined by the height of the one-fold vertical plate (102).

4. The crack monitoring device for a building structure according to claim 1, characterized in that: The monitoring data generating plate (8) is made of a transparent organic glass or stainless steel with a smooth surface. The probe of the displacement sensor (7) is vertically downward and in contact with the monitoring data generating plate (8). The displacement sensor (7) is connected to the wireless signal device (6) via a cable. The wireless signal device (6) transmits the reading of the displacement sensor (7) to the outside via radio.

5. The crack monitoring device for a building structure according to claim 1, characterized in that: The monitoring data generating plate (8) is fixedly connected to the auxiliary bracket plate (2) through the long waist hole and the screws. The center of the cross mark (801) is located directly below the center of the positioning ring (3). The cross mark (801) is provided with scales in four directions with the center as the zero point.

6. The crack monitoring device for a building structure according to claim 1, characterized in that: A camera is installed at the center of the detection head (4), and LED lights are installed around the camera. A display screen is provided on the on-site detector (5) so that cracks can be directly seen through the camera. The wireless signal device (6) can send photos taken by the camera to the outside through radio.

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