A bridge displacement detection device for bridge construction

Abstract

This invention belongs to the field of bridge inspection technology, and specifically relates to a bridge displacement detection device during bridge construction. It includes a lower mounting base and two upper mounting bases. The two lower mounting bases are respectively installed on the sidewalls of two piers facing each other, and the two upper mounting bases are respectively installed on both sides of the bottom of the main beam. A control main board is provided on one side of each of the two lower mounting bases. The device also includes two positioning plates, each fixedly connected to the sidewall of the lower mounting base on the same side. A photoelectric indicator unit is provided on the top of each positioning plate. This invention can not only be used to detect displacement and tilt angle during the hoisting and construction of the bridge main beam, but also to perform permanent displacement and angle detection after the bridge construction is completed. It eliminates the need for additional detection devices, reducing installation complexity and cost, and simultaneously minimizes false triggering caused by bridge vibration.

Description

Technical Field

[0001] This invention belongs to the field of bridge inspection technology, and in particular relates to a bridge displacement detection device for bridge construction. Background Technology

[0002] With the rapid development of my country's economy and automobile industry, early-built long-span continuous steel structure bridges have developed cracks and other defects due to factors such as vehicle overloading, construction quality, and construction standards. If the defects are not significantly improved after reinforcement and repair, they need to be demolished and rebuilt.

[0003] Currently, during the reconstruction of bridges, a new bridge is usually built on one side of the old bridge for temporary traffic use. In the construction of the new bridge, the relative displacement detection between the main beam and the pier is particularly important and is the key to ensuring the safe use of the bridge. For example, a bridge displacement detection device for bridge construction is disclosed in patent publication number CN117387541B.

[0004] In the reconstruction project of the navigation channel bridge, the main beam lowering construction faced many challenges. The main beam was lifted into place by a surface crane, but the undulating water made it difficult to find a suitable observation point. Construction personnel could only rely on the original bridge to remotely command the crane operation via walkie-talkie. When two cranes worked together, poor communication and delayed instructions often led to a cumbersome, slow, and inefficient beam lowering operation. Even when the main beam was lowered to the temporary support of the pier, it still needed to be repeatedly adjusted, resulting in unsatisfactory construction results. In addition, displacement detection during the main beam lowering stage and subsequent permanent monitoring required different detection devices, which not only increased the installation complexity but also increased equipment costs. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a bridge displacement detection device for bridge construction.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a bridge displacement detection device for bridge construction, comprising two lower mounting seats and two upper mounting seats, wherein the two lower mounting seats are respectively installed on the sidewalls of two piers facing each other, and the two upper mounting seats are respectively installed on both sides of the bottom of the main beam; a control main board is provided on one side of each of the two lower mounting seats, and the device further comprises:

[0007] Both positioning plates are fixedly connected to the side wall of the lower mounting base on the same side, and both positioning plates are provided with photoelectric indicator units on their tops;

[0008] Both laser lights are mounted on the bottom of the mounting base on the same side, and the positions of the two laser lights correspond to the positions of the photoelectric indicator units on the same side.

[0009] Two skew detection units are installed at the bottom of the mounting base on the same side to detect the degree of skewness of the main beam.

[0010] Preferably, both photoelectric indicator units include a mounting slot on the top of the positioning plate, and a zero-position photoelectric switch and multiple offset photoelectric switches are fixedly installed inside the mounting slot. The zero-position photoelectric switch and multiple offset photoelectric switches are distributed in a matrix in the mounting slot. After the laser light is aligned with the zero-position photoelectric switch, the installation position of the main beam is aligned with the support installation position of the pier. The zero-position photoelectric switch and the offset photoelectric switch are electrically connected to the control main board. A wireless communication controller is installed at the bottom of the upper mounting base, and the wireless communication controller is communicatively connected to the control main board. A transparent plate is fixedly installed on the positioning plate above the mounting slot. A display is provided on one side of each of the two lower mounting bases, and the control main board controls the operation of the display according to the multiple offset photoelectric switches.

[0011] Preferably, both of the tilt detection units include a circular sleeve fixedly installed at the bottom of the upper mounting base. A suspension rope is installed at the bottom of the upper mounting base inside the circular sleeve, and a counterweight is installed at the bottom of the suspension rope. A mounting ring is sleeved on the outer side of the suspension rope and fixed to the bottom of the upper mounting base. An annular pressure detector is installed on the inner wall of the mounting ring. The annular pressure detector is used to detect the pressure applied by the suspension rope and convert the pressure into an electrical signal, which is then fed back to the control main board through a wireless communication controller. A gas generation mechanism is installed on the side wall of the circular sleeve.

[0012] Preferably, both gas generating mechanisms include multiple cylinders fixedly installed on the lower end of the side wall of the sleeve, and each cylinder is evenly distributed in a ring about the axis of the sleeve. Each cylinder is provided with a compression exhaust assembly inside. The end of each cylinder away from the sleeve is fixedly connected to an annular hollow plate, and the annular hollow plate is connected to the compression exhaust assembly. An exhaust hose is installed on the annular hollow plate. An air jet assembly is installed on the side wall of the lower mounting base, and the air jet assembly is connected to the exhaust hose.

[0013] Preferably, each of the extrusion exhaust components includes a piston slidably disposed inside the cylinder, and an impact rod is fixedly connected to the side wall of the piston near the counterweight. A support spring is provided between the side wall of the piston away from the counterweight and the inner wall of the cylinder on the same side. The side wall of the cylinder is provided with an air inlet and an air outlet. The air outlet is connected to the interior of the annular hollow plate. An air inlet check valve is installed inside the air inlet, and an air outlet check valve is installed inside the air outlet.

[0014] Preferably, the jet assembly includes a hollow jet plate fixedly installed on the side wall of the lower mounting base, and the side wall of the hollow jet plate is fixedly connected to an installation pipe, which is connected to an exhaust hose. The side wall of the hollow jet plate is provided with a conical jet hole corresponding to the position of the transparent plate, and the diameter of the inlet end of the conical jet hole is larger than the diameter of the outlet end.

[0015] Preferably, a timer is fixedly installed at the bottom of the positioning plate, and the control motherboard controls the timer to work after receiving the electrical signal fed back by the annular pressure detector.

[0016] Preferably, a dust filter plate is installed at the bottom of the annular hollow plate, and the dust filter plate is fixedly connected to the bottom of the circular sleeve.

[0017] Compared with existing technologies, the advantages of a bridge displacement detection device for bridge construction are:

[0018] By coordinating the lower mounting base, upper mounting base, positioning plate, photoelectric indicator unit, and laser light, the offset position and direction of the main beam installation end can be accurately indicated when the main beam is lowered, and the offset direction can be displayed. This reminds the operators of the hoisting equipment to flexibly and accurately adjust the position of the main beam, thereby improving the accuracy of the main beam lowering. Furthermore, it can not only indicate the position of the main beam during installation, but also perform permanent displacement detection on the main beam without the need for additional detection devices, reducing installation complexity and cost.

[0019] The skew detection unit can detect the skew angle of the main beam during its lowering process, thus promptly alerting the hoisting equipment operators to any skew angle and ensuring the main beam is lowered horizontally and accurately. Furthermore, the timer it is equipped with can prevent false triggering of displacement detection caused by the vibration of the main beam during subsequent permanent displacement detection.

[0020] By using the air-generating mechanism, the vibration generated by the main beam due to vehicle movement can be used to generate airflow, which can then be used to clean the dust on the surface of the photoelectric indicator unit, minimizing the impact of dust on the photoelectric indicator unit. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of a bridge displacement detection device for bridge construction provided by the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the lower mounting base of a bridge displacement detection device for bridge construction provided by the present invention;

[0023] Figure 3 This is a three-dimensional structural diagram of the upper mounting base of a bridge displacement detection device for bridge construction provided by the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the positioning plate of a bridge displacement detection device for bridge construction provided by the present invention;

[0025] Figure 5This is a schematic diagram showing the positions of the zero-position photoelectric switch and the offset photoelectric switch of a bridge displacement detection device for bridge construction provided by the present invention;

[0026] Figure 6 This is a schematic diagram of the internal structure of the circular sleeve of a bridge displacement detection device for bridge construction provided by the present invention;

[0027] Figure 7 This invention provides a bridge displacement detection device for bridge construction. Figure 6 Enlarged view of the structure of part A in the middle.

[0028] In the diagram: 1 Lower mounting base, 2 Upper mounting base, 3 Pier, 4 Main beam, 5 Control main board, 6 Positioning plate, 7 Photoelectric indicator unit, 71 Mounting slot, 72 Zero-position photoelectric switch, 73 Offset photoelectric switch, 74 Wireless communication controller, 75 Transparent plate, 76 Display, 8 Laser light, 9 Tilt detection unit, 91 Circular sleeve, 92 Lifting rope, 93 Counterweight, 94 Mounting ring, 95 Circular pressure detector, 10 Gas generation mechanism, 101 Cylinder, 102 Circular hollow plate, 103 Exhaust hose, 11 Exhaust assembly, 111 Piston, 112 Impact rod, 113 Support spring, 114 Air inlet, 115 Air outlet, 116 Inlet check valve, 117 Exhaust check valve, 12 Jet assembly, 121 Hollow jet plate, 122 Mounting pipe, 123 Conical jet hole, 13 Timer, 14 Dust filter plate. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] like Figures 1-7As shown, a bridge displacement detection device for bridge construction includes two lower mounting seats 1 and two upper mounting seats 2. The two lower mounting seats 1 are respectively installed on the side walls of two piers 3 facing each other, and the two upper mounting seats 2 are respectively installed on the bottom sides of the main beam 4. A control main board 5 is provided on one side of each of the two lower mounting seats 1. The device also includes two positioning plates 6, each fixedly connected to the side wall of the lower mounting seat 1 on the same side. A photoelectric indicator unit 7 is provided on the top of each of the two positioning plates 6. Each photoelectric indicator unit 7 includes a mounting groove 71 opened on the top of the positioning plate 6. A zero-position photoelectric switch 72 and multiple offset photoelectric switches 73 are fixedly installed inside the mounting groove 71. The zero-position photoelectric switch 72 and multiple offset photoelectric switches 73 are distributed in a matrix within the mounting groove 71. After the laser light 8 is aligned with the zero-position photoelectric switch 72, the installation position of the main beam 4 and the support installation position of the pier 3 are determined. Alignment, zero-position photoelectric switch 72 and offset photoelectric switch 73 are electrically connected to control main board 5. Wireless communication controller 74 is installed at the bottom of upper mounting base 2 and is communicatively connected to control main board 5. A transparent plate 75 is fixedly installed on positioning plate 6 above mounting groove 71. Display 76 is provided on one side of each of the two lower mounting bases 1, and control main board 5 controls the operation of display 76 according to multiple offset photoelectric switches 73. Display 76 is used to display the direction of offset and tilt of main beam 4, which is convenient for on-site hoisting equipment operators to view. The number of zero-position photoelectric switches 72 on a single positioning plate 6 is the same as the number of main beams 4. For example, when only one main beam 4 is installed on pier 3, the number of zero-position photoelectric switches 72 on the two positioning plates 6 is 1. When there are 2 main beams 4, the number of zero-position photoelectric switches 72 on the positioning plate 6 is 2.

[0031] Both laser lights 8 are mounted on the bottom of the mounting base 2 on the same side, and the positions of the two laser lights 8 correspond to the positions of the photoelectric indicator units 7 on the same side.

[0032] Two skew detection units 9 are installed on the bottom of the upper mounting base 2 on the same side to detect the degree of skewness of the main beam 4. Each skew detection unit 9 includes a circular sleeve 91 fixedly installed on the bottom of the upper mounting base 2. A suspension rope 92 is installed on the bottom of the upper mounting base 2 inside the circular sleeve 91, and a counterweight 93 is installed on the bottom of the suspension rope 92. An installation ring 94 is sleeved on the outside of the suspension rope 92 and fixed to the bottom of the upper mounting base 2. An annular pressure detector 95 is installed on the inner wall of the installation ring 94. The annular pressure detector 95 is used to detect the pressure applied by the suspension rope 92 and convert the pressure into an electrical signal, which is fed back to the control main board 5 through the wireless communication controller 74.

[0033] Gas generating mechanisms 10 are installed on the side wall of the sleeve 91. Each gas generating mechanism 10 includes multiple cylinders 101 fixedly installed at the lower end of the side wall of the sleeve 91. The cylinders 101 are evenly distributed in a ring about the axis of the sleeve 91. Each cylinder 101 is provided with a compression exhaust assembly 11. The end of each cylinder 101 away from the sleeve 91 is fixedly connected to an annular hollow plate 102, and the annular hollow plate 102 is connected to the compression exhaust assembly 11. Each compression exhaust assembly 11 includes a piston 111 slidably disposed inside the cylinder 101. The piston 111 is located on the side wall near the counterweight 93. An impact rod 112 is fixedly connected. A support spring 113 is provided between the side wall of the piston 111 away from the counterweight 93 and the inner wall of the cylinder 101 on the same side. The side wall of the cylinder 101 is provided with an air inlet 114 and an air outlet 115. The air outlet 115 is connected to the inside of the annular hollow plate 102. An air inlet one-way valve 116 is installed inside the air inlet 114, and an air outlet one-way valve 117 is installed inside the air outlet 115. Under the action of the air inlet one-way valve 116 and the air outlet one-way valve 117, the airflow can only enter the cylinder 101 through the air inlet 114 and can only be discharged through the air outlet 115.

[0034] An exhaust hose 103 is installed on the annular hollow plate 102. An air jet assembly 12 is installed on the side wall of the lower mounting base 1 and is connected to the exhaust hose 103. The air jet assembly 12 includes a hollow air jet plate 121 fixedly installed on the side wall of the lower mounting base 1. An installation pipe 122 is fixedly connected to the side wall of the hollow air jet plate 121 and is connected to the exhaust hose 103. A conical air jet hole 123 corresponding to the position of the transparent plate 75 is opened on the side wall of the hollow air jet plate 121. The diameter of the air inlet end of the conical air jet hole 123 is larger than the diameter of the air outlet end, which can clean dust and other objects on the surface of the transparent plate 75.

[0035] A timer 13 is fixedly installed at the bottom of the positioning plate 6. After receiving the electrical signal from the annular pressure detector 95, the control motherboard 5 controls the timer 13 to work, which can reduce the phenomenon of bridge tilting and displacement being falsely triggered.

[0036] A dust filter plate 14 is installed at the bottom of the annular hollow plate 102, and the dust filter plate 14 is fixedly connected to the bottom of the circular sleeve 91. The dust filter plate 14 can filter dust and other impurities in the airflow to avoid affecting the cleaning effect on the surface of the transparent plate 75.

[0037] The operating principle of the present invention is explained as follows: Before hoisting the main beam 4, the mounting base 2 is installed at the bottom of the main beam 4 (the bottom of the main beam 4 needs to reserve the mounting hole of the upper mounting base 2, and the error between the mounting hole and the connection point on the main beam 4 for the pier 3 support shall not be greater than 1 mm). Then, the lower mounting base 1 is installed on the side wall of the corresponding pier 3 (the error between the lower mounting base 1 and the mounting point on the top of the pier 3 for the bridge support shall not be greater than 1 mm). After the upper mounting base 2 is installed, the battery is used as the temporary power source for the wireless communication controller 74, and the control motherboard 5 is connected to the external circuit. Then, the hoisting work of the main beam 4 can begin. The main beam 4 is hoisted above the two piers 3 by the hoisting equipment, so that the two laser lights 8 are above the corresponding positioning plates 6. Then, the start signal is sent to the control motherboard 5 by the remote control.

[0038] After receiving the start signal, the control motherboard 5 will control the laser lamp 8 and the ring pressure detector 95 to start working via the wireless communication controller 74. When the laser lamp 8 is working, it will emit a laser beam that will illuminate the corresponding positioning plate 6. When the position of the main beam 4 shifts, the laser beam will not only fail to illuminate the corresponding zero-position photoelectric switch 72, but will also illuminate other offset photoelectric switches 73. After receiving the light signal, the corresponding offset photoelectric switch 73 will feed back an electrical signal to the control motherboard 5. The control motherboard 5 will then control the display 76 to display the signal according to the offset photoelectric switch 73 that has fed back the electrical signal. The corresponding arrow indicates that, for example, if one end of the main beam 4 shifts to the left, the offset photoelectric switch 73 to the left of the zero-position photoelectric switch 72 on that side will receive a light signal. At this time, the offset photoelectric switch 73 will send an electrical signal back to the control main board 5, and the control main board 5 will control the display 76 to display an arrow indicating movement to the right. After seeing the indicator arrow, the operator of the hoisting equipment can know that the main beam 4 has shifted to the left and needs to be moved to the right. This allows the hoisting personnel to adjust the position of the main beam 4 in the horizontal left-right and front-back directions in a timely and flexible manner (the arrows can be marked with different directions and different colors to facilitate the hoisting operators to distinguish them).

[0039] When the main beam 4 becomes skewed, for example, if the lowering height of the main beam 4 by the hoisting equipment on one side is different from that of the hoisting equipment on the other side, the main beam 4 will be skewed. Under the action of the counterweight 93, the part of the hoisting rope 92 located below the mounting ring 94 remains vertical. At this time, the side wall inside the mounting ring 94 of the hoisting rope 92 will apply pressure to the side wall of the annular pressure detector 95. After the annular pressure element inside the annular pressure detector 95 is subjected to pressure (such as an annular strain gauge or piezoelectric element), the annular pressure element will convert the deformation into an electrical signal and transmit this electrical signal through the wireless communication controller 74. Feedback is sent to the control motherboard 5. After receiving the feedback electrical signal, the control motherboard 5 will also display a corresponding arrow on the display 76 (different from the horizontal offset indicator arrow, so as to facilitate personnel to distinguish it) to remind the hoisting personnel to adjust the hoisting height of the main beam 4 so that the main beam 4 is kept horizontal. After the position and level of the main beam 4 are adjusted, the hoisting operator operates the hoisting equipment to lower the main beam 4. During this period, if the position of the main beam 4 is offset or the angle is skewed, the display 76 will still display a corresponding arrow, and the hoisting operator can make timely adjustments to ensure that the main beam 4 is accurately placed on the installation support of the pier 3.

[0040] After the installation between the main beam 4 and the pier 3 is completed, the workers remove the power supply from the main beam 4 that temporarily powers the laser light 8, the annular pressure detector 95, and the wireless communication controller 74. They then connect the wireless communication controller 74 to the control motherboard 5, connect the exhaust hose 103 to the mounting pipe 122, and remove the display 76. Simultaneously, they establish communication between the terminal and the wireless communication controller 74 (the terminal can be a mobile phone or other device). After the bridge construction is completed, the control motherboard 5 is connected to the external power supply line. Afterward, the control motherboard 5 will control the laser light 8 to operate, and the light emitted by the laser light 8 will... When the laser beam shines on the zero-position photoelectric switch 72, it sends an electrical signal back to the control board 5. When the electrical signal from the zero-position photoelectric switch 72 to the control board 5 is disconnected, and other offset photoelectric switches 73 send electrical signals back to the control board 5, it indicates that the main beam 4 has shifted. At this time, the control board 5 will send relevant information to the remote terminal through the wireless communication controller 74 to remind the staff to check the displacement of the main beam 4 in time (each offset photoelectric switch 73 can be numbered, and the position of the laser beam can be confirmed according to the number, so as to quickly know the amount of horizontal displacement of the bridge).

[0041] Meanwhile, when the main beam 4 of the bridge is tilted during use, according to the aforementioned principle, the annular pressure detector 95 will also send an electrical signal to the control board 5. At this time, the control board 5 can send the corresponding tilt information of the main beam 4 to the remote terminal through the wireless communication controller 74. The greater the pressure detected by the annular pressure detector 95, the greater the tilt angle of the bridge.

[0042] Because vehicle vibrations can cause synchronous bridge vibrations, the laser light 8 and suspension rope 92 will vibrate synchronously during this vibration. This causes the laser beam to deviate from the zero-position photoelectric switch 72, and the annular pressure detector 95 to send electrical signals to the control board 5. Consequently, the wireless communication controller 74 may mistakenly send a warning message to the remote terminal. To avoid this phenomenon, when the bridge vibrates, the vibration force is transmitted through the main beam 4 to the suspension rope 92. At this time, the counterweight 93 will sway, causing the annular pressure detector 95 to send electrical signals to the control board 5. After receiving the electrical signal from the annular pressure detector 95, the control board 5 will immediately start the timer 13. If the electrical signal from the annular pressure detector 95 changes excessively, the timer 13 will be reset to zero and the timing will restart. For example, when the electrical signal from the annular pressure detector 95 to the control board 5 is 10 mA... When the electrical signal exceeds 12 mA or falls below 8 mA, the control motherboard 5 resets the timer 13 to zero and restarts the countdown. When the electrical signal remains at 10 mA and falls between 8 mA and 12 mA, the control motherboard 5 continues to count the timer 13. After 2 minutes, it indicates that the bridge is tilting or displaced. At this time, the control motherboard 5 sends a prompt message to the remote terminal to minimize the occurrence of false prompts. (Because the vibration force is uneven and cannot be maintained continuously, when the bridge tilts or displaces due to vibration, the electrical signal strength fed back to the control motherboard 5 by the ring pressure detector 95 is constantly changing and it is not easy to maintain a stable electrical signal range. When the bridge tilts or displaces and there is no external vibration, the timer 13 will continue to count to minimize the occurrence of false prompts.)

[0043] Meanwhile, when the counterweight 93 vibrates and shakes normally, it will strike the impact rod 112 around the sleeve 91, thereby pushing the piston 111 to move. When the piston 111 moves, it will compress the air inside the cylinder 101 on the same side, so that the air enters the annular hollow plate 102 through the air outlet 115, and enters the hollow jet plate 121 through the exhaust hose 103 and the mounting pipe 122, and finally is ejected through the conical jet hole 123. The ejected airflow can clean the dust on the surface of the transparent plate 75, thereby minimizing the continuous accumulation of dust on the transparent plate 75. Accumulation on 5 affects the normal reception of the laser beam by the zero-position photoelectric switch 72 and the offset photoelectric switch 73. When the counterweight 93 leaves the impact rod 112, the piston 111 moves back to its original position under the action of the support spring 113. At this time, the external airflow is supplemented into the cylinder 101 through the dust filter plate 14 and the air inlet 114 to achieve airflow supplementation. The dust filter plate 14 can intercept dust in the airflow (under the impact of the counterweight 93 and the vibration of the main beam 4, the dust accumulated on the surface of the dust filter plate 14 is easy to fall off, thus preventing dust from clogging the dust filter plate 14).

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bridge displacement detection device for bridge construction, comprising two lower mounting seats (1) and two upper mounting seats (2), wherein the two lower mounting seats (1) are respectively installed on the sidewalls of two piers (3) facing each other, and the two upper mounting seats (2) are respectively installed on both sides of the bottom of the main beam (4), and a control main board (5) is provided on one side of each of the two lower mounting seats (1), characterized in that, Also includes: Both positioning plates (6) are fixedly connected to the side wall of the lower mounting base (1) on the same side, and both positioning plates (6) are provided with photoelectric indicator units (7) on their tops. Two laser lights (8) are installed at the bottom of the mounting base (2) on the same side, and the positions of the two laser lights (8) correspond to the positions of the photoelectric indicator units (7) on the same side. Two skew detection units (9) are installed at the bottom of the mounting base (2) on the same side to detect the degree of skewness of the main beam (4); Both photoelectric indicator units (7) include a mounting groove (71) on the top of the positioning plate (6), and a zero-position photoelectric switch (72) and multiple offset photoelectric switches (73) are fixedly installed inside the mounting groove (71). The zero-position photoelectric switch (72) and multiple offset photoelectric switches (73) are arranged in a matrix in the mounting groove (71). After the laser lamp (8) is aligned with the zero-position photoelectric switch (72), the installation position of the main beam (4) is aligned with the support installation position of the pier (3). 72) and offset photoelectric switch (73) are electrically connected to the control main board (5). The bottom of the upper mounting base (2) is equipped with a wireless communication controller (74), and the wireless communication controller (74) is connected to the control main board (5). The positioning plate (6) is fixedly installed with a transparent plate (75) above the mounting groove (71). A display (76) is provided on one side of each of the two lower mounting bases (1), and the control main board (5) controls the display (76) to work according to the multiple offset photoelectric switches (73). Both of the aforementioned tilt detection units (9) include a circular sleeve (91) fixedly installed at the bottom of the upper mounting base (2). A suspension rope (92) is installed at the bottom of the upper mounting base (2) inside the circular sleeve (91), and a counterweight (93) is installed at the bottom of the suspension rope (92). An installation ring (94) is sleeved on the outer side of the suspension rope (92), and the installation ring (94) is fixed at the bottom of the upper mounting base (2). An annular pressure detector (95) is installed on the inner wall of the installation ring (94). The annular pressure detector (95) is used to detect the pressure applied by the suspension rope (92) and convert the pressure into an electrical signal, which is fed back to the control main board (5) through the wireless communication controller (74). A gas generating mechanism (10) is installed on the side wall of the circular sleeve (91).

2. The bridge displacement detection device for bridge construction according to claim 1, characterized in that, Both of the gas generating mechanisms (10) include multiple cylinders (101) fixedly installed on the lower end of the side wall of the sleeve (91), and each cylinder (101) is evenly distributed in a ring about the axis of the sleeve (91). Each cylinder (101) is provided with a compression exhaust assembly (11). The end of each cylinder (101) away from the sleeve (91) is fixedly connected to an annular hollow plate (102), and the annular hollow plate (102) is connected to the compression exhaust assembly (11). The annular hollow plate (102) is equipped with an exhaust hose (103). The side wall of the lower mounting base (1) is equipped with a jet assembly (12), and the jet assembly (12) is connected to the exhaust hose (103).

3. A bridge displacement detection device for bridge construction according to claim 2, characterized in that, Each of the aforementioned extrusion exhaust components (11) includes a piston (111) slidably disposed inside the cylinder (101), and an impact rod (112) is fixedly connected to the side wall of the piston (111) near the counterweight (93). A support spring (113) is provided between the side wall of the piston (111) away from the counterweight (93) and the inner wall of the cylinder (101) on the same side. An air inlet (114) and an air outlet (115) are provided on the side wall of the cylinder (101). The air outlet (115) is connected to the interior of the annular hollow plate (102). An air inlet check valve (116) is installed inside the air inlet (114), and an air outlet check valve (117) is installed inside the air outlet (115).

4. A bridge displacement detection device for bridge construction according to claim 2, characterized in that, The jet assembly (12) includes a hollow jet plate (121) fixedly installed on the side wall of the lower mounting base (1), and the side wall of the hollow jet plate (121) is fixedly connected to an installation pipe (122). The installation pipe (122) is connected to an exhaust hose (103). The side wall of the hollow jet plate (121) is provided with a conical jet hole (123) corresponding to the position of the transparent plate (75), and the inlet diameter of the conical jet hole (123) is larger than the outlet diameter.

5. A bridge displacement detection device for bridge construction according to claim 1, characterized in that, A timer (13) is fixedly installed on the bottom of the positioning plate (6). After receiving the electrical signal fed back by the annular pressure detector (95), the control motherboard (5) controls the timer (13) to work.

6. A bridge displacement detection device for bridge construction according to claim 2, characterized in that, A dust filter plate (14) is installed at the bottom of the annular hollow plate (102), and the dust filter plate (14) is fixedly connected to the bottom of the circular sleeve (91).

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