Cantilever construction hanging basket vibration monitoring system and method

Abstract

The invention relates to the technical field of hanging basket vibration monitoring. In order to monitor the vibration condition of a hanging basket in the cantilever construction process in real time, the cantilever construction hanging basket vibration monitoring system and method are characterized in that laser points emitted by a first laser emitter are projected to the left side area of an induction plate, and laser points emitted by a second laser emitter are projected to the right side area of the induction plate; the current detection circuit detects an electric signal generated by position change of a laser point on the photosensitive plate, and level signal change occurs only when the laser point is on two boundaries of the photosensitive plate. The data processor can monitor the vibration condition of the hanging basket in the horizontal direction and the vertical direction in real time according to the electric signal change moment detected by the current detection circuit, the width of the light sensing pieces and the distance between the light sensing pieces, the dynamic change of the hanging basket can be comprehensively and accurately monitored, and the construction safety and quality are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of hanging basket vibration monitoring, and in particular to a cantilever construction hanging basket vibration monitoring system and method. Background Art

[0002] During the cantilever construction of steel aqueducts, the basket, as a crucial component of the support structure, is crucial for vibration monitoring. The basket is typically used to support and suspend poured concrete or other construction materials. As construction progresses, its structure is subjected to varying degrees of mechanical loads. Especially in complex construction environments and subject to external factors (such as wind speed, temperature fluctuations, and vibration), the basket's stability and safety become critical concerns during construction. Excessive vibration or displacement deviations in the basket can lead to construction quality issues or safety accidents, and in severe cases, even impact the progress and quality of the entire steel aqueduct construction process. Traditional basket monitoring methods typically rely on manual inspections or periodic testing with a small number of fixed sensors, but these methods have limitations. For example, manual inspections lack real-time performance, have limited data volumes, and are susceptible to subjective factors. Furthermore, the limited number of fixed sensors makes it impossible to fully monitor the complex vibration characteristics of the basket during construction. Consequently, there is a lack of an efficient, real-time, and accurate basket vibration monitoring system that can capture vibration data in real time, perform dynamic analysis, and issue timely warnings. With the rapid development of modern monitoring technology, vibration monitoring has been gradually applied to the safety monitoring of large-scale projects such as buildings and bridges. However, real-time monitoring of the hanging basket vibration during cantilever construction of steel aqueducts remains a technical bottleneck. Accurately monitoring the hanging basket in complex construction environments and analyzing its vibration characteristics in real time are pressing technical challenges. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a cantilever construction hanging basket vibration monitoring system and method, the purpose of which is to monitor the vibration of the hanging basket in real time during the cantilever construction process.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: On the one hand, the present invention provides a cantilever construction hanging basket vibration monitoring system, the system comprising a laser emitting device, a laser receiver, a first current detection circuit, a second current detection circuit and a data processor; the laser emitting device comprises a first laser emitter and a second laser emitter, the laser receiver comprises a sensing plate, the sensing plate is divided into a left area and a right area of equal area, the left area and the right area are respectively provided with a plurality of photosensitive sheets of uniform size and equal intervals, the photosensitive sheets are arranged horizontally on one side area and vertically on the other side area, the photosensitive sheets on the left area are all connected to the first current detection circuit, and the photosensitive sheets on the right area are all connected to the second current detection circuit, the laser emitting device is fixed to both sides of the hanging basket, and the laser receiver is arranged at the central aqueduct of the hanging basket; When the hanging basket vibrates, the laser point emitted by the first laser emitter is projected onto the left area of the sensing plate, and the laser point emitted by the second laser emitter is projected onto the right area of the sensing plate. The first and second current detection circuits detect the electrical signals generated by the position changes of the laser points projected onto the sensing plate. The data processor monitors the moment of change of the electrical signals based on the electrical signals detected by the first and second current detection circuits, and analyzes the vibration of the hanging basket in combination with the width of the photosensitive sheet and the interval between the photosensitive sheets.

[0005] Furthermore, the laser emitting device also includes a transmitter fixing base, a clamp and a support rod, and the clamp and the support rod each include two, and the clamp is slidably connected to the two support rods through a through hole at one end, and the clamp can be locked on the support rod by a bolt passing through the side of the through hole. The other end of the two clamps away from the support rod is facing away from the other support rod, and an installation groove for installing the first laser emitter or the second laser emitter is provided at this end.

[0006] Furthermore, the laser receiver also includes a support base and a light shielding box. The support base is fixed at the center of the aqueduct, and the light shielding box is fixed on the support base. One side of the light shielding box is open. The sensor plate is arranged in the light shielding box, and one side of the light sensing plate is arranged facing the opening side of the light shielding box.

[0007] On the other hand, the present invention also provides a cantilever construction hanging basket vibration monitoring method, the method comprising: Step 1: Install laser emitting devices on both sides of the hanging basket, install laser receivers at the center aqueduct of the hanging basket, and level the laser emitting devices on both sides; Step 2: Number the positions of the photosensitive sheets on the sensor board, starting from the lowest photosensitive sheet in the horizontal arrangement area and the leftmost photosensitive sheet in the vertical arrangement area, and number the photosensitive sheets in ascending order; Step 3: The data processor records the time when the electric signal changes (i=0, 1, 2...n) and the serial number of the photosensitive sheet where the laser point is located at the corresponding time according to the electric signal collected by the first or second current detection circuit, and combines the width of the photosensitive sheet with the data. The spacing between adjacent photosensitive sheets Determine the direction and displacement of the hanging basket vibration.

[0008] Furthermore, the vertical or horizontal displacement of the basket at time k relative to time k-1 is for: ,in is the displacement of the laser point at time k-1, is the serial number of the photosensitive film where the laser point is located at time k, is the photosensitive plate number where the laser point is located at time k-1, is the serial number of the photosensitive film where the laser point is located at time k-2.

[0009] Furthermore, step 3 also includes detecting the instantaneous speed and acceleration of the hanging basket when it vibrates.

[0010] Furthermore, the instantaneous speed of the hanging basket at time k is: , The time it takes for the laser point to move at time k relative to time k-1 by the width d1 of the photosensitive sheet. It is the time taken when the displacement at time k relative to time k-1 is the interval d2 between adjacent photosensitive plates.

[0011] Further, ,in and Respectively At time k, the laser point is located at the boundary between two adjacent photosensitive sheets. and Respectively At time k and time k, the laser points are located at two boundary positions of the same photosensitive sheet.

[0012] Furthermore, the acceleration of the hanging basket when it vibrates at time k is or ,in is the instantaneous speed of the hanging basket vibration at time k-1.

[0013] Furthermore, the method also includes that if any one of the displacement, displacement speed or acceleration of the hanging basket in the horizontal direction and the vertical direction exceeds a set threshold, the data processor automatically issues an alarm.

[0014] Beneficial effects of the present invention: In a cantilever construction hanging basket vibration monitoring system and method described in the present invention, when the hanging basket vibrates, the laser point emitted by the first laser emitter is projected onto the left area of the sensing plate, and the laser point emitted by the second laser emitter is projected onto the right area of the sensing plate. The current detection circuit detects the electrical signal generated by the position change of the laser point on the sensing plate. Since the electrical signal changes only at the two boundaries of the photosensitive sheet, the data processor monitors the moment of electrical signal change and the width of the photosensitive sheet and the distance between the photosensitive sheets according to the electrical signal detected by the current detection circuit, so as to monitor the vibration of the hanging basket in the horizontal and vertical directions in real time, and can comprehensively and accurately monitor the dynamic changes of the hanging basket to ensure construction safety and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the installation of a cantilever construction hanging basket vibration monitoring system according to the present invention; Figure 2 Schematic diagram of the structure of the laser emitting device; Figure 3 This is a schematic diagram of the laser receiver structure; Figure 4 Schematic diagram of the arrangement of the light-sensing sheet on the sensor board; Among them, Ⅰ, laser emitting device, Ⅱ, laser receiver, 1, transmitter fixing base, 2, clamp, 3, transmitter support rod, 4, laser transmitter, 5, laser receiver support rod base, 6, light shielding box, 7, sensor plate. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] like Figure 1 As shown in FIG, a cantilever construction hanging basket vibration monitoring system in the present invention includes a laser emitting device I and a laser receiver II. Figure 2 As shown, the laser emitting device I includes a transmitter fixing base 1, a clamp 2 (including a first clamp and a second clamp), a transmitter support rod 3, a transmitter support rod 3 (including a first support rod and a second support rod), a laser emitter 4, and a laser emitter 4 (including a first laser emitter and a second laser emitter), wherein the transmitter fixing base 1 is fixed to the center of the hanging basket crossbeam by bolts, the first support rod and the second support rod are respectively fixed to the two threaded holes of the transmitter fixing base 1 by threaded connection, the first clamp and the second clamp are respectively concentrically matched with the first support rod or the second support rod through their circular holes, the first clamp and the second clamp are symmetrically arranged outwardly and the height can be freely adjusted on the first support rod or the second support rod, slots are opened on both sides of the circular hole of the clamp 2, once the height is adjusted appropriately, the threaded holes on the side of the slot can be tightened and fixed by bolts, the outer circular hole of the clamp 2 is used to install and fix the laser emitter 4, similarly, it can be tightened and fixed by bolts through the threaded holes on the side of the slot.

[0018] like Figure 3 As shown, the laser receiver II includes a receiver support rod base 5, a light shielding box 6, and a sensing plate 7, wherein the receiver support rod base 5 is fixedly installed at the center of the aqueduct by bolt connection, the light shielding box 6 is fixedly connected to the upper end of the rod portion of the receiver support rod base 5, and the rod portion of the receiver support rod base 5 can be freely extended and retracted, and the sensing plate 7 is installed in the light shielding box 6, one side of the light shielding box 6 is open, and the side of the sensing plate 7 with the light sensing sheet facing the open side of the light shielding box 6. When not in use, the open side of the light shielding box 6 can be blocked to block sunlight shining on the sensing plate to avoid sensing failure.

[0019] Two identical sets of transmitters I are fixedly installed in the center of the crossbeams of the hanging baskets on both sides, and the receiver II is fixedly installed in the center of the aqueduct (bridge pier). Each set of transmitters I has two identical laser transmitters 4. The sensor plates 7 of the transmitters I and receivers II are arranged symmetrically with respect to the center plane. The light emitted by the laser transmitter 4 should be able to illuminate the sensor plate 7, and the laser transmitter 4 and the center of the sensor plate 7 should be arranged on the same horizontal line. The aspect ratio of the sensing plate 7 is 1:2. The light sensing sheet on the sensing plate 7 is as follows: Figure 4 As shown by the black stripes, the material is photosensitive material, the width , stripe interval Among them, the photosensitive sheets on the sensing board 7 are arranged in vertical and horizontal arrangements to detect the vertical displacement and lateral displacement of the hanging basket respectively; both ends of each photosensitive sheet are connected to pins, the horizontally arranged photosensitive sheets are connected to the first current detection circuit through pins, and the vertically arranged photosensitive sheets are connected to the first current detection circuit through pins.

[0020] The specific steps of a cantilever construction hanging basket vibration monitoring method in the present invention are as follows: a. First, install laser emitting devices I on both sides of the hanging basket and laser receiver II in the center of the aqueduct (center of the pier). To ensure that the installed laser emitting device I and laser receiver II are on the same horizontal plane, the two devices need to be leveled. Turn on the laser emitter 4. Determine the relative height based on the light spot illuminated by the laser on the sensor plate 7. Adjust the height of the clamp 2 of the laser emitting device I and the height of the receiver support rod seat 5 of the laser receiver II so that the laser spot is as close as possible to the center of the left half (right half) of the sensor plate 7. Level the four laser emitters on both sides of the hanging basket in this way. Repeat this process. Once construction is completed, move the hanging basket to the next construction position, continue leveling, and then begin monitoring.

[0021] b. Further, using the left half of the sensor plate 7 to monitor the vertical vibration of the hanging basket as an example, the current detection circuit is connected to the pins at both ends of each photosensitive sheet on the sensor plate 7. The power supply is turned on, and the positions of the photosensitive sheets are numbered in ascending order, starting with the photosensitive sheet at the bottom of the horizontally arranged area and the photosensitive sheet at the leftmost of the vertically arranged area. c. Detect the horizontal and vertical movement direction and displacement of the laser point when the hanging basket vibrates: the data processor records the time when the electric signal changes (i=0, 1, 2...n) and the serial number of the photosensitive sheet where the laser point is at the corresponding time according to the electric signal collected by the current detection circuit, and combines the width of the photosensitive sheet with the data processor to determine the displacement of the laser point in the horizontal and vertical directions. The spacing between adjacent photosensitive sheets Determine the direction and displacement of the hanging basket vibration. The specific method is: the vertical or horizontal displacement of the hanging basket at time k relative to time k-1 for: ,in is the displacement of the laser point at time k-1, is the serial number of the photosensitive film where the laser point is located at time k, is the photosensitive plate number where the laser point is located at time k-1, is the serial number of the photosensitive film where the laser point is located at time k-2.

[0022] d. The cantilever construction hanging basket vibration detection method of the present invention also detects the speed of the hanging basket vibration. The instantaneous speed of the hanging basket when vibrating at time k is: , The time it takes for the laser point to move at time k relative to time k-1 by the width d1 of the photosensitive sheet. The time taken for the displacement at time k relative to time k-1 to be equal to the interval d2 between adjacent photosensitive sheets; in, ,in and Respectively At time k, the laser point is located at the boundary between two adjacent photosensitive sheets. and Respectively At time k and time k, the laser points are located at two boundary positions of the same photosensitive sheet.

[0023] e. Further, the instantaneous acceleration of the light spot between adjacent photosensitive sheets is calculated based on the instantaneous motion speed. The specific expression is: or ,in is the instantaneous speed of the hanging basket vibration at time k-1.

[0024] g. If any of the displacement components, velocity components or acceleration components of the hanging basket in the horizontal and vertical directions exceeds the set threshold, the data processor will automatically issue an alarm.

[0025] Although the above embodiments have described the purpose, concept and embodiments of the present invention in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, so they are not described in detail here.

Claims

1. A cantilever construction hanging basket vibration monitoring system, characterized in that: The system includes a laser emitting device, a laser receiver, a first current detection circuit, a second current detection circuit, and a data processor; the laser emitting device includes a first laser emitter and a second laser emitter, and the laser receiver includes a sensing plate, which is divided into a left area and a right area of equal area. The left area and the right area are respectively provided with a plurality of photosensitive sheets of uniform size and equal intervals. The photosensitive sheets are arranged horizontally on one area and vertically on the other area. The photosensitive sheets on the left area are all connected to the first current detection circuit, and the photosensitive sheets on the right area are all connected to the second current detection circuit. The laser emitting device is fixed to both sides of the hanging basket, and the laser receiver is arranged at the aqueduct in the center of the hanging basket; When the hanging basket vibrates, the laser point emitted by the first laser emitter is projected onto the left area of the sensing plate, and the laser point emitted by the second laser emitter is projected onto the right area of the sensing plate. The first and second current detection circuits detect the electrical signals generated by the position changes of the laser points projected onto the sensing plate. The data processor monitors the moment of change of the electrical signals based on the electrical signals detected by the first and second current detection circuits, and analyzes the vibration of the hanging basket in combination with the width of the photosensitive sheet and the interval between the photosensitive sheets.

2. A cantilever construction hanging basket vibration monitoring system according to claim 1, characterized in that: The laser emitting device also includes a transmitter fixing base, a clamp and a support rod. The clamp and the support rod each include two. The clamp is slidably connected to the two support rods through a through hole at one end, and the clamp can be locked on the support rod by a bolt passing through the side of the through hole. The other end of the two clamps away from the support rod is facing away from the other support rod, and an installation groove for installing the first laser emitter or the second laser emitter is provided at this end.

3. The cantilever construction hanging basket vibration monitoring system according to claim 1 is characterized in that: The laser receiver also includes a support base and a light shielding box. The support base is fixed at the center of the aqueduct, and the light shielding box is fixed on the support base. One side of the light shielding box is open. The sensor plate is arranged in the light shielding box, and the side of the light sensor is arranged facing the opening side of the light shielding box.

4. A cantilever construction hanging basket vibration monitoring method, applied to a cantilever construction hanging basket vibration monitoring system according to any one of claims 1 to 3, characterized in that: The method comprises: Step 1: Install laser emitting devices on both sides of the hanging basket, install laser receivers at the center aqueduct of the hanging basket, and level the laser emitting devices on both sides; Step 2: Number the positions of the photosensitive sheets on the sensor board, starting from the lowest photosensitive sheet in the horizontal arrangement area and the leftmost photosensitive sheet in the vertical arrangement area, and number the photosensitive sheets in ascending order; Step 3: The data processor records the time when the electric signal changes (i=0, 1, 2...n) and the serial number of the photosensitive sheet where the laser point is located at the corresponding time according to the electric signal collected by the first or second current detection circuit, and combines the width of the photosensitive sheet with the data. The spacing between adjacent photosensitive sheets Determine the direction and displacement of the hanging basket vibration.

5. A cantilever construction vibration detection method according to claim 4, characterized in that: The vertical or horizontal displacement of the hanging basket at time k relative to time k-1 for: ,in is the displacement of the laser point at time k-1, is the serial number of the photosensitive film where the laser point is located at time k, is the photosensitive plate number where the laser point is located at time k-1, is the serial number of the photosensitive film where the laser point is located at time k-2.

6. A cantilever construction hanging basket vibration detection method according to claim 5, characterized in that: The step 3 also includes detecting the instantaneous speed and acceleration of the hanging basket when it vibrates.

7. A cantilever construction hanging basket vibration detection method according to claim 6, characterized in that: The instantaneous speed of the hanging basket at time k is: , The time it takes for the laser point to move at time k relative to time k-1 by the width d1 of the photosensitive sheet. It is the time taken when the displacement at time k relative to time k-1 is the interval d2 between adjacent photosensitive sheets.

8. A cantilever construction hanging basket vibration monitoring method according to claim 7, characterized in that: ,in and Respectively At time k, the laser point is located at the boundary between two adjacent photosensitive sheets. and Respectively At time k and time k, the laser points are located at two boundary positions of the same photosensitive sheet.

9. A cantilever construction vibration monitoring method according to claim 7, characterized in that: The acceleration of the hanging basket when it vibrates at time k is or ,in is the instantaneous speed of the hanging basket vibration at time k-1.

10. A cantilever construction vibration detection method according to any one of claims 1 to 9, characterized in that: The method further includes the step of automatically issuing an alarm by the data processor if any one of the displacement, displacement speed or acceleration of the hanging basket in the horizontal direction and the vertical direction exceeds a set threshold value.

Images