Bridge displacement detection device for bridge construction

Abstract

The invention relates to the technical field of bridge displacement detection, in particular to a bridge displacement detection device for bridge construction, which comprises a plurality of mounting blocks fixedly mounted at bridge detection points, one side of each mounting block is provided with a laser transmitter, and the other side of each mounting block is provided with a plurality of photoresistors for measuring illumination intensity; a processing panel and a storage battery are fixedly connected in the mounting block, a supporting rod is fixedly connected to the bottom of the mounting block, and irradiation pipelines used for shielding laser are detachably connected to the two sides of the mounting block; the processing panel is used for recording and storing a construction bridge model, acquiring position coordinates of each mounting block, adding monitoring point marks, and recording and storing angle marks of each photoresistor; the processing panel further establishes a displacement fluctuation graph of the current time period based on the corresponding angle marks and the center distance marks; the method is used for bridge displacement detection of multiple monitoring points, has the advantage of timely responsiveness, and guarantees the measurement precision.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge displacement detection, and particularly to a bridge displacement detection device for bridge construction. Background Art

[0002] During the construction process of a bridge, it may be affected by various factors, such as foundation settlement, temperature change, and construction load. These factors may cause displacement of the bridge structure. Through displacement detection, it is possible to determine whether the construction quality meets the requirements, understand the deformation law and trend of the bridge, and provide a strong guarantee for the safe operation of the bridge.

[0003] Existing bridge displacement detection methods mainly include laser ranging method, total station method, sensor technology, and image detection method, etc. Among them, the total station method usually sets up a reference point on the bridge tower using a level, and measures the horizontal displacement of the reference point. The longitudinal horizontal displacement of the bridge tower is monitored by moving the position of the reference point, and the longitudinal horizontal displacement of the bridge is monitored by the elevation difference of multiple reference points. It has a high degree of dependence on manual labor, a large amount of engineering work, and is easily affected by climate, different positions, and time changes during observation, resulting in the omission of some harmful information. The existing laser ranging method and image detection method have the advantages of high precision and fast processing, but they are both affected by weather and light conditions and cannot be used normally in some cases. Sensor technology is generally only used for local deformation conditions, insufficient for the overall deformation monitoring of the bridge, and has high requirements for the test accuracy and stability of the sensor itself, and is prone to cumulative errors, resulting in a reduction in the credibility of the results.

[0004] Therefore, the present invention provides a bridge displacement detection device based on laser ranging, which is applicable to the bridge displacement detection of multiple monitoring points and has the advantage of timely responsiveness. Summary of the Invention

[0005] To solve the above problems, the present invention provides a bridge displacement detection device for bridge construction, which is used for the bridge displacement detection of multiple monitoring points, has the advantage of timely responsiveness, and ensures the measurement accuracy.

[0006] To achieve the above object, the technical solution of the present invention is as follows: A bridge displacement detection device for bridge construction includes a plurality of mounting blocks for fixedly installing at the detection points on the bridge. At the center of one side of the mounting block, a laser emitter for emitting laser is fixedly connected. On the other side of the mounting block, a plurality of photoresistors for measuring the light intensity are fixedly connected. A processing panel and a storage battery are fixedly connected inside the mounting block. A support rod is fixedly connected to the bottom of the mounting block. On both sides of the mounting block, an irradiation pipe for blocking the laser is detachably connected.

[0007] The processing panel is used to record and store the construction bridge model, obtain the position coordinates of each installation block, add monitoring point marks to the construction bridge model; and input and store the angle marks of each photosensitive resistor, and add associated marks to the corresponding monitoring point marks based on the angle marks and the preset center distance marks.

[0008] The photosensitive resistor is used to generate a real-time current value based on the light intensity and send the real-time current value to the processing panel based on the associated mark; the processing panel establishes a displacement fluctuation graph for the current time period based on the angle mark and the center distance mark corresponding to the associated mark.

[0009] Further, the photosensitive resistors are arranged in a ring with the installation block as the center, and the included angles between adjacent photosensitive resistors are the same.

[0010] Further, a first fitting block is provided below the support rod. A sliding groove is opened in the first fitting block, and a second fitting block is slidably fitted in the sliding groove. The second fitting block is fixedly connected to the end of the support rod away from the installation block.

[0011] A plurality of lenses are provided between the adjacent first fitting block and the second fitting block. The lenses are respectively fixedly connected to the first fitting block and the second fitting block; a gas bag is fixedly connected to the side of the second fitting block away from the first fitting block. An air passage is opened in the second fitting block. One end of the air passage is communicated with the gas bag, and the other end of the air passage is communicated with the side of the second fitting block close to the first fitting block.

[0012] Further, a plurality of clamping plates are fixedly connected to the outer edges on both sides of the installation block. A plurality of positioning holes are opened in the clamping plates, and bolts are threadedly connected in the positioning holes.

[0013] Further, a central rod is rotatably fitted on the irradiation pipe. A rotating block is fixedly connected to the top of the central rod. A reflecting mirror for changing the laser irradiation direction is fixedly connected to the center of the central rod. The reflecting mirror is located inside the irradiation pipe.

[0014] A conical placing block is fixedly connected to the bottom of the central rod.

[0015] Further, a plurality of air pipes are also fixedly connected to the outer wall of the irradiation pipe. One end of each air pipe is provided with an air inlet. The air inlet is located on the side of the irradiation pipe away from the placing block, and the air inlets are symmetrically arranged with the irradiation pipe as the center. The diameter of the air inlet is larger than the diameter of the air pipe.

[0016] The air pipe is also communicated with a second fan. The second fan includes a rotating shaft. The rotating shaft is rotatably fitted with the irradiation pipe. A plurality of fan blades are fixedly connected to the rotating shaft. The second fan is located on both sides of the irradiation pipe.

[0017] Further, a first fan is also rotatably fitted on the central rod. The first fan is located between the irradiation pipe and the placing block. One end of the air pipe away from the air inlet passes through the central rod and is communicated with the first fan. The air outlet of the first fan is located on the side of the central rod away from the placing block.

[0018] Further, an antenna is fixedly connected to the top of the installation block, and an indicator light is fixedly connected to one end of the antenna away from the installation block.

[0019] Further, the processing panel further includes a communication module for establishing a communication connection between the processing panel and the outside world;

[0020] The processing panel is also used to input and store the response levels marked at the monitoring points in the construction bridge model. The response levels include the response time of the time period and the edge value corresponding to the photoresistor; the processing panel also obtains the corresponding response level based on the current monitoring mark, compares the duration with the response time. If the duration is greater than the response time, it obtains the change value corresponding to the center distance mark, compares the change value with the edge value. If the change value is greater than the edge value, it sends a warning instruction to the outside world and sends the displacement fluctuation graph of the current time period; if the change value is less than the edge value, it sends a normal instruction to the outside world;

[0021] If the duration is less than the response time, a maintenance instruction is sent to the laser emitter.

[0022] Further, the processing panel is also used to calculate the difference between the wave crest and the wave trough based on the displacement fluctuation graph of the current time period, compare the difference with the set warning value. If the difference is greater than the warning value, a warning instruction is sent to the outside world; if the difference is less than the warning value, a verification passed instruction is sent to the outside world.

[0023] The following beneficial effects are achieved by adopting the above solution:

[0024] 1. In this solution, the installation block is fixed at the monitoring points of the bridge that need to be monitored through the support rod, so as to facilitate the confirmation of the deformation conditions of various positions of the bridge, and drive the change of the laser emitter's irradiation based on the displacement change of the bridge to confirm the displacement conditions of the bridge at various positions, realizing the displacement detection of the bridge at multiple monitoring points.

[0025] 2. In this solution, the irradiation pipeline is used for shielding protection to reduce the interference generated during the laser's straight-line irradiation caused by the changes in light irradiation at different times in foggy and sunny days, thereby improving the influence of the deformation of the installation block caused by the bridge on the laser irradiation angle in a timely manner, playing a role of timely response, and further ensuring the detection accuracy of the bridge displacement.

[0026] 3. In this solution, the processing panel performs comparison processing on the real-time current value generated by the photoresistor to determine the azimuth change when the bridge displacement changes, and establishes a corresponding displacement fluctuation graph to remind the construction personnel, so as to facilitate the confirmation of whether it is affected by the construction process or the displacement change of the bridge itself.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Is an axonometric view of an embodiment of the bridge displacement detection device for bridge construction according to the present invention;

[0029] Figure 2 Is a top view of an embodiment of the bridge displacement detection device for bridge construction according to the present invention;

[0030] Figure 3 Is a front view of an embodiment of the bridge displacement detection device for bridge construction according to the present invention;

[0031] Figure 4 Is a side view of an embodiment of the bridge displacement detection device for bridge construction according to the present invention;

[0032] Figure 5 Is Figure 1 The axonometric view of the mounting block in ;

[0033] Figure 6 Is Figure 5 The axonometric view of the other side of the mounting block in.

[0034] The reference numerals in the accompanying drawings of the specification include: 1, mounting block; 11, laser emitter; 12, photoresistor; 13, clamping plate; 14, positioning hole; 2, irradiation pipe; 21, central rod; 22, reflecting mirror; 23, rotating block; 24, placing block; 3, support rod; 31, first fitting block; 32, second fitting block; 33, airbag; 4, antenna; 41, indicator light; 5, air pipe; 51, air inlet; 52, second fan; 53, first fan;. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] The following is a further detailed description through specific embodiments:

[0039] Embodiment 1:

[0040] As shown in the Figures 1 to 6 accompanying drawings: A bridge displacement detection device for bridge construction includes a number of mounting blocks 1 for fixedly installing at the detection points on the bridge. At the center of one side of the mounting block 1, a laser emitter 11 for emitting laser is clamped, and a number of photosensitive resistors 12 for measuring the light intensity are bonded to the other side of the mounting block 1; the photosensitive resistors 12 are arranged in a ring with the mounting block 1 as the center, and the included angles between adjacent photosensitive resistors 12 are of the same size. A processing panel and a storage battery (not shown in the figures) are fixedly connected by bolts inside the mounting block 1. A support rod 3 is welded to the bottom of the mounting block 1, and irradiation pipes 2 for blocking the laser are detachably connected to both sides of the mounting block 1.

[0041] A number of clamping plates 13 are fixedly connected to the outer edges of both sides of the mounting block 1. A number of positioning holes 14 are opened in the clamping plates 13, and bolts are threadedly connected in the positioning holes 14. A first fitting block 31 is provided below the support rod 3. A sliding groove is opened in the first fitting block 31, and a second fitting block 32 is slidably fitted in the sliding groove. The second fitting block 32 is bonded to the end of the support rod 3 away from the mounting block 1; a number of lenses are provided between adjacent first fitting blocks 31 and second fitting blocks 32, and the lenses are respectively bonded to the first fitting block 31 and the second fitting block 32; an airbag 33 is bonded to the side of the second fitting block 32 away from the first fitting block 31. An air passage is opened in the second fitting block 32. One end of the air passage is communicated with the airbag 33, and the other end of the air passage is communicated with the side of the second fitting block 32 close to the first fitting block 31.

[0042] A central rod 21 is rotatably fitted on the irradiation pipe 2. A rotating block 23 is welded to the top of the central rod 21. A reflecting mirror 22 for changing the laser irradiation direction is welded at the center of the central rod 21. The reflecting mirror 22 is located inside the irradiation pipe 2. A tapered placement block 24 is welded to the bottom of the central rod 21.

[0043] An antenna 4 is snap-fitted on the top of the mounting block 1. An indicator light 41 is adhered to one end of the antenna 4 away from the mounting block 1. The indicator light 41 is electrically connected to the processing panel.

[0044] The processing panel is used to record and store the construction bridge model, obtain the position coordinates of each mounting block 1, and add monitoring point marks to the construction bridge model; and input and store the angle marks of each photosensitive resistor 12, and add associated marks to the corresponding monitoring point marks based on the angle marks and the central distance marks; the photosensitive resistor 12 is used to generate a real-time current value based on the light intensity and send the real-time current value to the processing panel based on the associated marks; the processing panel establishes a displacement fluctuation graph for the current time period based on the angle marks and the central distance marks corresponding to the associated marks.

[0045] The specific implementation process is as follows: First, by fixing the first fitting block 31 on the bridge in advance. In this embodiment, the fixing methods of the first fitting block 31 include bolt fixing and adhesive fixing. The positions of the bridge to be monitored are detected by preset monitoring points to facilitate the confirmation of the deformation of each position of the bridge, so as to drive the change of the irradiation of the laser emitter 11 based on the displacement change of the bridge, and to confirm the displacement of the bridge at each position, realizing the displacement detection of the bridge at multiple monitoring points.

[0046] During the process of fixing the mounting block 1, water mist is sprayed between the first fitting block 31 and the second fitting block 32, and the lens of the second fitting block 32 is pressed tightly on the lens of the first fitting block 31. The water is squeezed by the pressure to discharge the air between the first fitting block 31 and the second fitting block 32 by using the hydraulic pressure of the water, so as to form a pressure difference between the outside atmosphere and the air between the adjacent first fitting block 31 and the second fitting block 32, so as to maintain the fixed clamping of the second fitting block 32 and the mounting block 1. At the same time, the liquid between the first fitting block 31 and the second fitting block 32 is blocked by the sliding groove inside the first fitting block 31 to reduce the evaporation and discharge of the internal moisture, thereby increasing the fixing time. When the second fitting block 32 needs to be removed, the airbag 33 is manually pressed, so that the gas of the airbag 33 enters the space between the adjacent first fitting block 31 and the second fitting block 32 along the air duct, so as to break the fitting of the first fitting block 31 and the second fitting block 32, thus facilitating the installation and disassembly of the mounting block 1.

[0047] When the irradiation pipeline 2 needs to be installed, the irradiation pipeline 2 is placed between adjacent clamping plates 13, and the bolt is rotated to abut against the irradiation pipeline 2, so as to fix the installation block 1 and the irradiation pipeline 2, facilitating the disassembly and installation between the irradiation pipeline 2 and the installation block 1.

[0048] When detecting the displacement of the bridge, the conical placement block 24 is used to increase the contact area between the central rod 21 and the bridge, ensuring the stability during the support of the irradiation pipeline 2; when the irradiation direction of the laser inside the irradiation pipeline 2 needs to be adjusted, the rotation block 23 is rotated to drive the central rod 21 to rotate, and the central rod 21 drives the reflecting mirror 22 to rotate, so as to adjust the irradiation direction of the laser in the irradiation pipeline 2 to meet the construction needs of the arc-shaped bridge. The communication connection between the processing panel and the outside is enhanced through the antenna 4, facilitating the timely transmission and processing of the real-time current value; then the display processing is carried out through the indicator light 41, so as to confirm the position of the installation block 1 through the display of the indicator light 41, facilitating the maintenance and replacement of the device.

[0049] The laser emitted by the laser emitter 11 irradiates the photoresistors 12. Since the included angles between the photoresistors 12 are the same, during the irradiation of the photoresistors 12 by the laser, if the displacement of the detection point changes, the corresponding photoresistors 12 will have corresponding changes in the light intensity received, generating corresponding current change values to the processing panel, thereby determining the corresponding bridge displacement change. The irradiation pipeline 2 is used for shielding protection to reduce the interference caused by the changes in light irradiation at different times in foggy days and sunny days during the straight-line irradiation of the laser, thereby reducing the influence of the deformation of the installation block 1 caused by the bridge on the laser irradiation angle in the first time, playing a role of timely response, and further ensuring the detection accuracy of the bridge displacement. Then, the azimuth change when the bridge displacement occurs is determined through the real-time current value, and a corresponding displacement fluctuation graph is established to remind the construction personnel, facilitating the confirmation of whether it is affected by the construction process or the displacement change of the bridge itself.

[0050] Embodiment 2:

[0051] The difference from Embodiment 1 is that a plurality of air pipes 5 are adhesively bonded to the outer wall of the irradiation pipeline 2. One end of the air pipe 5 is provided with an air inlet 51. The air inlet 51 is located on the side of the irradiation pipeline 2 away from the placement block 24, and the air inlets 51 are symmetrically arranged with the irradiation pipeline 2 as the center. The diameter of the air inlet 51 is larger than the diameter of the air pipe 5 (not shown in the figure); the air pipe 5 is also connected to a second fan 52. The second fan 52 includes a rotating shaft, the rotating shaft is rotationally matched with the irradiation pipeline 2, and a plurality of fan blades are welded on the rotating shaft. The second fan 52 is located on both sides of the irradiation pipeline 2.

[0052] The specific implementation process is as follows: Since the bridge is located at a high position above the river surface, it is prone to the situation where the irradiation pipeline 2 is blown by strong winds. When the irradiation pipeline 2 is blown by the wind from one side, part of the wind first contacts the second fan 52 on one side, and the wind enters the air inlet 51 on the other side through the guidance of the air pipe 5; part of the wind directly enters the interior of the air pipe 5 on the other side along the air inlet 51, and after being guided by the air pipe 5, it blows the second fan 52 on the other side to rotate, so that the second fan 52 exerts a reverse driving force on the irradiation pipeline 2 to reduce the impact force when the irradiation pipeline 2 is blown by the wind on one side, so as to maintain the stability of the irradiation pipeline 2.

[0053] Embodiment 3:

[0054] The difference from Embodiment 2 is that a first fan 53 is also rotatably fitted on the central rod 21. The first fan 53 has a similar structure and the same principle as the second fan 52, which will not be elaborated in this embodiment. The first fan 53 is located between the irradiation pipeline 2 and the placement block 24. One end of the air pipe 5 far from the air inlet 51 passes through the central rod 21 and is communicated with the first fan 53. The air outlet of the first fan 53 is located on the side of the central rod 21 far from the placement block 24.

[0055] The specific implementation process is as follows: When the wind from the outside enters the interior of the air pipe 5 along the air inlet 51, the gas passes through the second fan 52 and the first fan 53 along the air duct in sequence to blow the fan blades of the first fan 53 to rotate, so that the gas moves from the air outlet of the first fan 53 to the side far from the placement block 24 to push the placement block 24 to move in the direction close to the bridge, so as to improve the support stability of the central rod 21 for the irradiation pipeline 2, thereby reducing the movement caused by the outside wind blowing the irradiation pipeline 2, so as to maintain the laser irradiation inside the irradiation pipeline 2.

[0056] Embodiment 4:

[0057] The difference from Embodiment 3 is that the processing panel further includes a communication module for establishing a communication connection between the processing panel and the outside world; the processing panel is also used to input and store the response levels marked at the monitoring points in the construction bridge model. The response levels include the response time of the time period and the edge value corresponding to the photosensitive resistor 12.

[0058] The processing panel also obtains the corresponding response level based on the current monitoring mark, compares the duration with the response time. If the duration is greater than the response time, it obtains the change value corresponding to the central distance mark, compares the change value with the edge value. If the change value is greater than the edge value, it sends a warning instruction to the outside world and sends the displacement fluctuation graph of the current time period; if the change value is less than the edge value, it sends a normal instruction to the outside world; if the duration is less than the response time, it sends a maintenance instruction to the laser emitter 11.

[0059] For example, the positions of the monitoring points arranged on the bridge are different, and there are different interferences. For example, in places with a large amount of external interference such as the construction location and the strong wind location, the vibration generated during the construction process is easily transmitted to the installation block 1, resulting in the laser transmitter 11 sending jitter and deviation. Therefore, a relatively long time of comparison and reminder is required to reduce the false warning caused by construction. For the bridge positions where displacement may occur, a relatively long time of multiple comparison reminders are required to determine whether the bridge has displaced in a timely manner, so as to play a role in timely response.

[0060] Embodiment 5:

[0061] The difference from Embodiment 4 is that the processing panel is further configured to calculate the difference between the peak and the trough based on the displacement fluctuation graph of the current time period, compare the difference with a set warning value, and if the difference is greater than the warning value, send a warning instruction to the outside; if the difference is less than the warning value, send a verification passed instruction to the outside.

[0062] For example, based on the position fluctuation of the monitoring points, a reminder instruction is sent to the outside to remind the construction personnel that the monitoring point has a strong jitter or displacement, so as to determine the cause of this situation, remind the construction personnel to conduct key observations and make timely adjustments to ensure the safety of the bridge.

[0063] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A bridge displacement detection device for bridge construction, comprising a plurality of mounting blocks (1) for fixedly mounting on a bridge detection point, a laser emitter (11) for emitting laser light fixedly connected at the center of one side of the mounting block (1), and a plurality of photoresistors (12) for measuring light intensity fixedly connected at the other side of the mounting block (1); characterized in that: A processing panel and a storage battery are fixedly connected inside the mounting block (1), a support rod (3) is fixedly connected to the bottom of the mounting block (1), and irradiation pipes (2) for shielding laser light are detachably connected to both sides of the mounting block (1); The processing panel is used to record and store the construction bridge model, obtain the position coordinates of each installation block (1) and add monitoring point marks to the construction bridge model; and recording and storing the angle mark of each photoresistor (12), and adding an associated mark to the corresponding monitoring point mark based on the angle mark and the preset center distance mark; The photoresistor (12) is used to generate a real-time current value based on the light intensity, and send the real-time current value to the processing panel based on the associated tag; The processing panel establishes a displacement fluctuation graph of the current time period based on the angle mark and the center distance mark corresponding to the associated mark.

2. The bridge displacement detection device for bridge construction according to claim 1, characterized in that: The photoresistors (12) are arranged in a ring shape with the mounting block (1) as the center, and the angles between adjacent photoresistors (12) are of the same size.

3. The bridge displacement detection device for bridge construction according to claim 2, characterized in that: A first fitting block (31) is provided below the support rod (3), a sliding groove is provided in the first fitting block (31), a second fitting block (32) is slidably fitted in the sliding groove, and the second fitting block (32) is fixedly connected to an end of the support rod (3) away from the mounting block (1); A plurality of lenses are arranged between the adjacent first bonding block (31) and the second bonding block (32), and the lenses are fixedly connected to the first bonding block (31) and the second bonding block (32) respectively; an air bag (33) is fixedly connected to a side of the second bonding block (32) away from the first bonding block (31), and an air passage is opened on the second bonding block (32), one end of the air passage is connected to the air bag (33), and the other end of the air passage is connected to a side of the second bonding block (32) close to the first bonding block (31).

4. The bridge displacement detection device for bridge construction according to claim 3, characterized in that: A plurality of clamping plates (13) are fixedly connected to the outer edges of both sides of the mounting block (1), a plurality of positioning holes (14) are formed on the clamping plates (13), and bolts are connected to the inner threads of the positioning holes (14).

5. The bridge displacement detection device for bridge construction according to claim 4, characterized in that: A central rod (21) is rotatably mounted on the irradiation pipe (2), a rotating block (23) is fixedly connected to the top of the central rod (21), a reflector (22) for changing the laser irradiation direction is fixedly connected to the center of the central rod (21), and the reflector (22) is located in the irradiation pipe (2); A conical placement block (24) is fixedly connected to the bottom of the central rod (21).

6. The bridge displacement detection device for bridge construction according to claim 5, characterized in that: The outer wall of the irradiation pipe (2) is also fixedly connected to a plurality of air pipes (5), one end of the air pipe (5) is provided with an air inlet (51), the air inlet (51) is located on a side of the irradiation pipe (2) away from the placement block (24), and the air inlet (51) is symmetrically arranged with the irradiation pipe (2) as the center, and the diameter of the air inlet (51) is greater than the diameter of the air pipe (5); The air pipe (5) is also connected to a second fan (52), which comprises a rotating shaft, which is rotatably matched with the irradiation pipe (2), and a plurality of fan blades are fixedly connected to the rotating shaft. The second fan (52) is located on both sides of the irradiation pipe (2).

7. The bridge displacement detection device for bridge construction according to claim 6, characterized in that: A first fan (53) is rotatably mounted on the central rod (21). The first fan (53) is located between the irradiation pipe (2) and the placement block (24). One end of the air pipe (5) away from the air inlet (51) passes through the central rod (21) and is connected to the first fan (53). The air outlet of the first fan (53) is located on a side of the central rod (21) away from the placement block (24).

8. The bridge displacement detection device for bridge construction according to claim 7, characterized in that: The top of the mounting block (1) is fixedly connected with an antenna (4), and one end of the antenna (4) away from the mounting block (1) is fixedly connected with an indicator light (41).

9. The bridge displacement detection device for bridge construction according to claim 8, characterized in that: The processing panel also includes a communication module, which is used to establish a communication connection between the processing panel and the outside world; The processing panel is also used to input and store the response level of the monitoring point mark in the construction bridge model, the response level including the response time of the time period and the edge value corresponding to the photoresistor (12); the processing panel also obtains the corresponding response level based on the current monitoring mark, compares the duration with the response time, and if the duration is greater than the response time, obtains the change value corresponding to the center distance mark, compares the change value with the edge value, and if the change value is greater than the edge value, sends a warning instruction to the outside world, and sends a displacement fluctuation diagram of the current time period; if the change value is less than the edge value, sends a normal instruction to the outside world; If the duration is less than the response time, a maintenance instruction is sent to the laser transmitter (11).

10. The bridge displacement detection device for bridge construction according to claim 9, characterized in that: The processing panel is also used to calculate the difference between the peak and the trough based on the displacement fluctuation graph of the current time period, and compare the difference with the set warning value. If the difference is greater than the warning value, a warning instruction is issued to the outside world; if the difference is less than the warning value, a verification pass instruction is sent to the outside world.

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