Bridge displacement detection device for bridge construction

Abstract

The invention belongs to the technical field of bridge detection, and particularly relates to a bridge construction bridge displacement detection device which comprises lower mounting bases and two upper mounting bases, the two lower mounting bases are mounted on the side walls of the opposite sides of two piers correspondingly, and the two upper mounting bases are mounted on the two sides of the bottom of a main beam correspondingly. One side of each lower mounting seat is provided with a control mainboard, the two positioning plates are fixedly connected with the side wall of the lower mounting seat on the same side, and the tops of the two positioning plates are provided with photoelectric indication units. The device can be used for detecting the displacement and the inclination angle in the bridge girder hoisting construction process, permanent displacement and angle detection can be conducted on a bridge after bridge construction is completed, redundant detection devices are not needed, the installation complexity and cost are reduced, and meanwhile the false triggering phenomenon caused by bridge vibration can be avoided as much as possible.

Description

Technical Field

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

[0002] With the rapid development of my country's economy and automobile industry, the large-span, continuous steel structure bridges built in the early days have been affected by factors such as vehicle overloading, construction quality, and construction standards, and have gradually developed cracks and other defects. After reinforcement and maintenance, if the defects are not significantly improved, they need to be demolished and rebuilt.

[0003] Currently, during bridge reconstruction, a new bridge is usually built on the side of the old bridge for temporary traffic. During 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, patent publication number CN117387541B discloses a bridge displacement detection device for bridge construction. In the reconstruction project of the navigation bridge, the main beam lowering construction faced many difficulties. The main beam was lifted into place by a water-based ship crane. However, the fluctuations in the water surface made it difficult to find a suitable observation point. The construction personnel could only rely on the original bridge to remotely command the ship crane operation by intercom. When the two ship cranes worked together, poor communication and delayed instructions often led to cumbersome and slow beam lowering operations and low efficiency. Even if the main beam fell to the temporary support of the pier, it still needed to be repeatedly adjusted, and the construction effect was unsatisfactory. In addition, the displacement detection of the main beam during the lowering stage and the subsequent permanent monitoring required reliance on different detection devices, which not only increased the complexity of the installation, but also increased the equipment cost. Summary of the Invention

[0004] The purpose of the present invention is to provide a bridge displacement detection device for bridge construction in order to solve the above problems.

[0005] To achieve the above-mentioned object, 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 mounted on the side walls of two piers facing each other, and the two upper mounting seats are respectively mounted on both sides of the bottom of the main beam, and a control mainboard is provided on one side of each of the two lower mounting seats, and further comprising: Two positioning plates are fixedly connected to the side wall of the lower mounting seat on the same side, and the tops of the two positioning plates are provided with photoelectric indicating units; Two laser lights are mounted on the bottom of the upper 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; Two skew detection units are installed at the bottom of the mounting seat on the same side and are used to detect the skewness of the main beam.

[0006] Preferably, the two photoelectric indication units each include a mounting groove opened on the top of the positioning plate, and a zero-position photoelectric switch and a plurality of offset photoelectric switches are fixedly installed inside the mounting groove, and the zero-position photoelectric switch and the plurality of offset photoelectric switches are distributed in the mounting groove in a matrix. 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 seat, and the wireless communication controller is communicatively connected to the control main board, a transparent plate is fixedly installed at the position of the positioning plate above the mounting groove, a display is provided on one side of the two lower mounting seats, and the control main board controls the operation of the display according to the plurality of offset photoelectric switches.

[0007] Preferably, the two skew detection units each include a circular sleeve fixedly mounted on the bottom of the upper mounting seat, a lifting rope is mounted on the bottom of the upper mounting seat located inside the circular sleeve, and a counterweight is mounted on the bottom of the lifting rope, a mounting ring is provided on the outer sleeve of the lifting rope, and the mounting ring is fixed to the bottom of the upper mounting seat, an annular pressure detector is mounted on the inner wall of the mounting ring, the annular pressure detector is used to detect the pressure applied by the lifting rope, and convert the pressure into an electrical signal and feed it back to the control main board through the wireless communication controller, and a gas generating mechanism is mounted on the side wall of the circular sleeve.

[0008] Preferably, the two gas-producing mechanisms each include a plurality of cylinders fixedly mounted on the lower end of the side wall of the sleeve, and the cylinders are evenly distributed in a ring shape about the axis of the sleeve, an extrusion exhaust assembly is provided inside each of the cylinders, and an annular hollow plate is fixedly connected to one end of each cylinder away from the sleeve, and the annular hollow plate is connected to the extrusion exhaust assembly, an exhaust hose is installed on the annular hollow plate, and a jet assembly is installed on the side wall of the lower mounting seat, and the jet assembly is connected to the exhaust hose.

[0009] Preferably, each of the extrusion exhaust components includes a piston slidably arranged inside the cylinder, and the side wall of the piston close to the counterweight block is fixedly connected to a collision rod, and a support spring is commonly provided between the side wall of the piston away from the counterweight block and the inner wall of the cylinder on the same side, and the side wall of the cylinder is provided with an air inlet hole and an air outlet hole, and the air outlet hole is connected with the interior of the annular hollow plate, and an air inlet check valve is installed inside the air inlet hole, and an air outlet check valve is installed inside the air outlet hole.

[0010] Preferably, the jet assembly includes a hollow jet plate fixedly mounted on the side wall of the lower mounting seat, and the side wall of the hollow jet plate is fixedly connected to a mounting pipe, the mounting pipe is connected to the exhaust hose, and 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 aperture of the conical jet hole at the air inlet end is larger than the aperture of the air outlet end.

[0011] Preferably, a timer is fixedly installed on the bottom of the positioning plate, and the control main board controls the timer to work after receiving the electrical signal fed back by the annular pressure detector.

[0012] Preferably, a dust filter screen is installed at the bottom of the annular hollow plate, and the dust filter screen is fixedly connected to the bottom of the circular sleeve.

[0013] Compared with existing technologies, the advantages of a bridge construction bridge displacement detection device are: Through the mutual cooperation of the lower mounting seat, upper mounting seat, positioning plate, photoelectric indication unit and laser light, the offset position and direction of the main beam installation end can be accurately indicated when the main beam is dropped, and the offset direction can be displayed, so as to remind the operator of the lifting equipment to flexibly and accurately adjust the main beam position, thereby improving the accuracy of the main beam when dropping. Secondly, not only can the main beam position be indicated when the main beam is dropped and installed, but the main beam can also be permanently displaced without the need for additional detection devices, reducing the complexity and cost of installation.

[0014] By setting up a skew detection unit, the angle skew of the main beam can be detected during the main beam lowering process, so as to promptly remind the operator of the lifting equipment that the main beam angle is skew, which is conducive to keeping the main beam horizontal and accurately falling. Secondly, it is combined with the set timer to avoid the false triggering of displacement detection caused by main beam vibration during the subsequent permanent displacement detection of the main beam.

[0015] By setting up the gas-generating mechanism, the vibration of the main beam caused by the vehicle's running can be used to generate airflow, which can be used to clean the dust on the surface of the photoelectric indication unit, thereby minimizing the impact of dust on the photoelectric indication unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a bridge displacement detection device for bridge construction provided by the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of a lower mounting base of a bridge displacement detection device for bridge construction provided by the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of an upper mounting base of a bridge displacement detection device for bridge construction provided by the present invention; Figure 4 This is a schematic diagram of the internal structure of a positioning plate of a bridge displacement detection device for bridge construction provided by the present invention; Figure 5 This is a schematic diagram of the positions of a zero position photoelectric switch and an offset photoelectric switch of a bridge displacement detection device for bridge construction provided by the present invention; Figure 6This is a schematic diagram of the internal structure of a circular sleeve of a bridge displacement detection device for bridge construction provided by the present invention; Figure 7 The present invention provides a bridge construction bridge displacement detection device Figure 6 A magnified view of the structure of part A.

[0017] In the figure: 1 lower mounting seat, 2 upper mounting seat, 3 bridge pier, 4 main beam, 5 control main board, 6 positioning plate, 7 photoelectric indication 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 skew detection unit, 91 round sleeve, 92 lifting rope, 93 counterweight, 94 mounting ring, 95 annular pressure detector, 10 gas generating mechanism, 101 cylinder, 102 annular hollow plate, 103 exhaust hose, 11 extrusion exhaust assembly, 111 piston, 112 impact rod, 113 support spring, 114 air inlet, 115 air outlet, 116 air inlet check valve, 117 air outlet check valve, 12 jet assembly, 121 hollow jet plate, 122 mounting pipe, 123 conical jet hole, 13 timer, 14 dust filter plate. DETAILED DESCRIPTION

[0018] 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.

[0019] like Figure 1-Figure 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 mounted on the side walls on the opposite sides of the two piers 3, and the two upper mounting seats 2 are respectively mounted on both sides of the bottom of the main beam 4, and a control main board 5 is provided on one side of the two lower mounting seats 1, and also includes: two positioning plates 6, the two positioning plates 6 are fixedly connected to the side walls of the lower mounting seats 1 on the same side, and the tops of the two positioning plates 6 are provided with photoelectric indication units 7, and the two photoelectric indication units 7 include mounting grooves 71 opened on the tops of the positioning plates 6, and the inside of the mounting grooves 71 is fixedly installed with a zero position photoelectric switch 72 and a plurality of offset photoelectric switches 73, and the zero position photoelectric switch 72 and the plurality of offset photoelectric switches 73 are distributed in the mounting grooves 71 in a matrix. 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 aligned. Alignment, the zero position photoelectric switch 72 and the offset photoelectric switch 73 are electrically connected to the control main board 5, a wireless communication controller 74 is installed at the bottom of the upper mounting seat 2, and the wireless communication controller 74 is communicatively connected to the control main board 5, and the positioning plate 6 is fixedly installed with a transparent plate 75 at a position above the mounting groove 71. A display 76 is provided on one side of the two lower mounting seats 1, and the control main board 5 controls the display 76 according to multiple offset photoelectric switches 73. The display 76 is used to display the direction of the offset and skew of the main beam 4, which is convenient for the on-site lifting equipment operator to view. Among them, 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 the pier 3, the number of zero position photoelectric switches 72 on the two positioning plates 6 is 1, and when there are 2 main beams 4, the number of zero position photoelectric switches 72 on the positioning plate 6 is 2.

[0020] The two laser lamps 8 are both mounted on the bottom of the mounting base 2 on the same side, and the positions of the two laser lamps 8 correspond to the positions of the photoelectric indicator unit 7 on the same side; The two skew detection units 9 are both installed at the bottom of the upper mounting seat 2 on the same side, and are used to detect the degree of skewness of the main beam 4. The two skew detection units 9 both include a circular sleeve 91 fixedly installed at the bottom of the upper mounting seat 2. A lifting rope 92 is installed at the bottom of the upper mounting seat 2, which is located inside the circular sleeve 91, and a counterweight block 93 is installed at the bottom of the lifting rope 92. A mounting ring 94 is provided on the outer sleeve of the lifting rope 92, and the mounting ring 94 is fixed to the bottom of the upper mounting seat 2. An annular pressure detector 95 is installed on the inner wall of the mounting ring 94. The annular pressure detector 95 is used to detect the pressure applied by the lifting rope 92, and convert the pressure into an electrical signal and feed it back to the control main board 5 through the wireless communication controller 74.

[0021] The side wall of the circular sleeve 91 is equipped with a gas production mechanism 10. Both gas production mechanisms 10 include a plurality of cylinders 101 fixedly installed at the lower end of the side wall of the circular sleeve 91, and each cylinder 101 is evenly distributed in a ring shape about the axis of the circular sleeve 91. An extrusion exhaust component 11 is provided inside each cylinder 101. An end of each cylinder 101 away from the circular sleeve 91 is fixedly connected to an annular hollow plate 102, and the annular hollow plate 102 is connected to the extrusion exhaust component 11. Each extrusion exhaust component 11 includes a piston 111 slidably arranged inside the cylinder 101, and the piston 111 is close to the side wall of the counterweight block 93. It is fixedly connected with an impact rod 112, and a support spring 113 is provided between the side wall of the piston 111 away from the counterweight block 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 hole 114 and an air outlet hole 115, and the air outlet hole 115 is connected with the interior of the annular hollow plate 102. An air inlet check valve 116 is installed inside the air inlet hole 114, and an air outlet check valve 117 is installed inside the air outlet hole 115. Under the action of the air inlet check valve 116 and the air outlet check valve 117, the air flow can only enter the cylinder 101 from the air inlet hole 114 and can only be discharged through the air outlet hole 115.

[0022] The annular hollow plate 102 is installed with an exhaust hose 103, and the side wall of the lower mounting seat 1 is installed with a jet assembly 12, and the jet assembly 12 is connected to the exhaust hose 103. The jet assembly 12 includes a hollow jet plate 121 fixedly installed on the side wall of the lower mounting seat 1, and the side wall of the hollow jet plate 121 is fixedly connected with a mounting pipe 122, and the mounting pipe 122 is connected to the 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 aperture of the air inlet end of the conical jet hole 123 is larger than the aperture of the air outlet end, so that dust on the surface of the transparent plate 75 can be cleaned.

[0023] A timer 13 is fixedly installed at the bottom of the positioning plate 6. After the control main board 5 receives the electrical signal fed back by the annular pressure detector 95, it controls the timer 13 to work, which can reduce the phenomenon of bridge skewness and displacement false triggering.

[0024] 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 air flow to avoid affecting the cleaning effect of the surface of the transparent plate 75.

[0025] The operating principle of the present invention is now explained as follows: before hoisting the main beam 4, the upper mounting seat 2 is pre-installed on the bottom of the main beam 4 (a mounting hole for the upper mounting seat 2 needs to be reserved at the bottom of the main beam 4, and the error between the mounting hole and the connection point on the main beam 4 for the support of the pier 3 shall not be greater than 1 mm), and then the lower mounting seat 1 is installed on the corresponding side wall of the pier 3 (the error between the lower mounting seat 1 and the support installation point on the top of the pier 3 for installing the bridge shall not be greater than 1 mm). After the upper mounting seat 2 is installed, a battery is used as a temporary power source for the wireless communication controller 74, and the control main board 5 is connected to the external circuit. Then, the hoisting work of the main beam 4 can be started. 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, and then a start signal is sent to the control main board 5 via the remote control; After the control main board 5 receives the start signal, it will control the laser lamp 8 and the annular pressure detector 95 to start working through the wireless communication controller 74. When the laser lamp 8 is working, it will emit laser light, and the laser light will be irradiated on the corresponding positioning plate 6. When the position of the main beam 4 is offset, the laser beam will not only fail to irradiate the corresponding zero position photoelectric switch 72, but will also irradiate other offset photoelectric switches 73. After the offset photoelectric switch 73 receives the light signal, the corresponding offset photoelectric switch 73 will feedback an electrical signal to the control main board 5. The control main board 5 will control the display 76 to display the offset photoelectric switch 73 that has fed back the electrical signal. The corresponding arrow is indicated. For example, if one end of the main beam 4 deviates 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 feedback an electrical signal to the control main board 5, and the control main board 5 will control the display 76 to display an arrow moving to the right. After the operator of the hoisting equipment sees the indicator arrow, he will know that the main beam 4 deviates to the left and needs to move to the right, so that the hoisting personnel can adjust the position of the main beam 4 in the horizontal left and right and front and back directions in a timely and flexible manner (the arrows can be marked with different directions and different colors to facilitate the hoisting operator to distinguish); When the main beam 4 is skewed, for example, the lowering height of the main beam 4 by the lifting equipment on one side is different from that of the lifting equipment on the other side, the main beam 4 is skewed. Under the action of the counterweight 93, the part of the lifting rope 92 below the mounting ring 94 remains vertical. At this time, the side wall of the lifting rope 92 inside the mounting ring 94 will exert pressure on the side wall of the annular pressure detector 95. After the annular pressure element inside the annular pressure detector 95 is under pressure (annular strain gauge or piezoelectric element, etc.), the annular pressure element will convert the deformation into an electrical signal and transmit the electrical signal through the wireless communication controller 74. The feedback signal is fed back to the control mainboard 5. After receiving the feedback signal, the control mainboard 5 will also display a corresponding arrow on the display 76 (different from the arrow indicating the horizontal deviation, so as to facilitate personnel to distinguish), so as to remind the hoisting personnel to adjust the hoisting height of the main beam 4 to keep the main beam 4 horizontal. After the position and level adjustment of the main beam 4 are completed, 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 corresponding arrow will still be displayed on the display 76, and the hoisting operator can make timely adjustments to ensure that the main beam 4 falls accurately on the installation support of the pier 3; After the installation between the main beam 4 and the pier 3 is completed, the staff will remove the power supply on the main beam 4 used to temporarily power the laser light 8, the annular pressure detector 95 and the wireless communication controller 74, and connect the wireless communication controller 74 to the control main board 5. Then, the exhaust hose 103 is connected to the installation pipe 122, and the display 76 is removed. At the same time, the communication between the terminal and the wireless communication controller 74 is connected (the terminal can be a mobile phone or other device). After the subsequent bridge construction is completed, the control main board 5 is connected to the external power supply line. After that, the control main board 5 will control the laser light 8 to work, and the light emitted by the laser light 8 will When the laser beam is irradiated onto the zero position photoelectric switch 72, the zero position photoelectric switch 72 will feedback an electrical signal to the control main board 5. When the electrical signal fed back by the zero position photoelectric switch 72 to the control main board 5 is disconnected and there are other offset photoelectric switches 73 feeding back electrical signals to the control main board 5, it can be said that the main beam 4 has been displaced. At this time, the control main board 5 will send corresponding information to the remote terminal via the wireless communication controller 74, reminding 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 irradiation can be confirmed according to the number, so as to quickly know the horizontal displacement of the bridge); At the same time, when the bridge is in use and the main beam 4 is skewed, according to the aforementioned principle, the annular pressure detector 95 will also feed back an electrical signal to the control main board 5. At this time, the control main board 5 can send the corresponding main beam 4 skew information to the remote terminal through the wireless communication controller 74. The greater the pressure detected by the annular pressure detector 95, the greater the angle of the bridge skew. Among them, the bridge will vibrate synchronously due to the vibration caused by the vehicle running, and during the vibration, the laser light 8, the suspension rope 92, etc. will vibrate synchronously, causing the laser beam to deviate from the zero position photoelectric switch 72, and the annular pressure detector 95 to feedback an electrical signal to the control main board 5, thereby causing the wireless communication controller 74 to mistakenly send a prompt message to the remote terminal. In order to avoid such a phenomenon, when the bridge vibrates, the vibration force is transmitted to the suspension rope 92 through the main beam 4. At this time, the counterweight block 93 will shake, causing the annular pressure detector 95 to feedback an electrical signal to the control main board 5. After receiving the electrical signal fed back by the annular pressure detector 95, the control main board 5 will immediately control the timer 13 to start working, and when the electrical signal fed back by the annular pressure detector 95 changes excessively, the timing information of the timer 13 will be reset to zero and the timing will be restarted. For example, when the electrical signal fed back by the annular pressure detector 95 to the control main board 5 is 10 mA When the electrical signal exceeds 12 mA or is lower than 8 mA, the control motherboard 5 controls the timer 13 to start timing. When the electrical signal exceeds 12 mA or is lower than 8 mA, the control motherboard 5 controls the timer 13 to reset and restart timing. When the electrical signal continues to remain at 10 mA and is between 8 mA and 12 mA, the control motherboard 5 controls the timer 13 to continue timing. After the timing reaches 2 minutes, it indicates that the bridge is skewed or displaced. At this time, the control motherboard 5 will send a prompt message to the remote terminal to avoid false triggering prompts as much as possible (because the vibration force is uneven and cannot be maintained continuously, when the bridge is skewed or displaced due to vibration, the electrical signal strength fed back by the annular pressure detector 95 to the control motherboard 5 is constantly changing and is not easy to maintain within a stable electrical signal range. When the bridge is skewed or displaced and there is no external vibration, the timer 13 will continue timing to avoid false sending of prompt messages as much as possible); At the same time, when the counterweight 93 is shaken normally due to vibration, the counterweight 93 will hit the impact rod 112 around the circular sleeve 91, thereby pushing the piston 111 to move. When the piston 111 is displaced, the piston 111 will squeeze 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 installation pipe 122, and finally is ejected through the conical jet hole 123. The ejected air flow can clean the dust on the surface of the transparent plate 75, thereby preventing the dust from continuing to accumulate on the transparent plate 75. 5, affecting 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 replenished into the cylinder 101 through the dust filter screen 14 and the air inlet 114, thereby replenishing the airflow. The dust filter screen 14 can intercept the dust in the airflow (under the action of the impact of the counterweight 93 and the vibration of the main beam 4, the dust accumulated on the surface of the dust filter screen 14 is easy to fall off, thereby preventing the dust from clogging the dust filter screen 14).

[0026] 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 in the scope of protection 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 mounted on the side walls of two piers (3) facing each other, and the two upper mounting seats (2) are respectively mounted on both sides of the bottom of a 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: Two positioning plates (6) are fixedly connected to the side wall of the lower mounting seat (1) on the same side, and a photoelectric indicating unit (7) is provided on the top of the two positioning plates (6); Two laser lamps (8) are mounted on the bottom of the upper mounting seat (2) on the same side, and the positions of the two laser lamps (8) correspond to the positions of the photoelectric indicator unit (7) on the same side; Two skew detection units (9) are both mounted on the bottom of the mounting seat (2) on the same side and are used to detect the degree of skewness of the main beam (4).

2. A bridge displacement detection device for bridge construction according to claim 1, characterized in that: The two photoelectric indicating units (7) each include a mounting groove (71) provided on the top of the positioning plate (6), and a zero position photoelectric switch (72) and a plurality of offset photoelectric switches (73) are fixedly installed inside the mounting groove (71), and the zero position photoelectric switch (72) and the plurality of offset photoelectric switches (73) are distributed in the mounting groove (71) in a matrix. After the laser light (8) is aligned with the zero position photoelectric switch (72), the mounting position of the main beam (4) is aligned with the support mounting position of the pier (3), and the zero position photoelectric switch ( The upper mounting seat (2) and the offset photoelectric switch (72) are electrically connected to the control main board (5); a wireless communication controller (74) is installed at the bottom of the upper mounting seat (2), and the wireless communication controller (74) is communicatively connected to the control main board (5); a transparent plate (75) is fixedly installed at a position above the mounting groove (71) on the positioning plate (6); a display (76) is provided on one side of each of the two lower mounting seats (1), and the control main board (5) controls the operation of the display (76) according to the multiple offset photoelectric switches (73).

3. A bridge displacement detection device for bridge construction according to claim 2, characterized in that: The two skew detection units (9) each include a circular sleeve (91) fixedly mounted on the bottom of the upper mounting seat (2); a suspension rope (92) is mounted on the bottom of the upper mounting seat (2) at a position inside the circular sleeve (91); a counterweight (93) is mounted on the bottom of the suspension rope (92); a mounting ring (94) is mounted on the outer sleeve of the suspension rope (92); and the mounting ring (94) is fixed to the bottom of the upper mounting seat (2); an annular pressure detector (95) is mounted on the inner wall of the mounting 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 and feed it back to the control main board (5) through the wireless communication controller (74); and a gas generating mechanism (10) is mounted on the side wall of the circular sleeve (91).

4. A bridge displacement detection device for bridge construction according to claim 3, characterized in that: The two gas production mechanisms (10) each include a plurality of cylinders (101) fixedly mounted on the lower end of the side wall of the circular sleeve (91), and the cylinders (101) are uniformly distributed in a circular shape about the axis of the circular sleeve (91), and an extrusion exhaust assembly (11) is provided inside each of the cylinders (101), and an end of each of the cylinders (101) away from the circular sleeve (91) is fixedly connected to an annular hollow plate (102), and the annular hollow plate (102) is connected to the extrusion exhaust assembly (11), and the annular hollow plate (102) is installed with an exhaust hose (103), and the side wall of the lower mounting seat (1) is installed with an injection assembly (12), and the injection assembly (12) is connected to the exhaust hose (103).

5. The bridge displacement detection device for bridge construction according to claim 4, characterized in that: Each of the extrusion exhaust components (11) includes a piston (111) slidably arranged inside the cylinder (101), and the side wall of the piston (111) close to the counterweight block (93) is fixedly connected to a striking rod (112), and a supporting spring (113) is provided between the side wall of the piston (111) away from the counterweight block (93) and the inner wall of the cylinder (101) on the same side, and an air inlet hole (114) and an air outlet hole (115) are provided on the side wall of the cylinder (101), and the air outlet hole (115) is communicated with the interior of the annular hollow plate (102), and an air inlet check valve (116) is installed inside the air inlet hole (114), and an air outlet check valve (117) is installed inside the air outlet hole (115).

6. The bridge displacement detection device for bridge construction according to claim 4, characterized in that: The jet assembly (12) comprises a hollow jet plate (121) fixedly mounted on the side wall of the lower mounting seat (1), and a mounting pipe (122) is fixedly connected to the side wall of the hollow jet plate (121), and the mounting pipe (122) is connected to the 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 aperture of the conical jet hole (123) at the air inlet end is larger than the aperture of the air outlet end.

7. The bridge displacement detection device for bridge construction according to claim 3, characterized in that: A timer (13) is fixedly mounted on the bottom of the positioning plate (6), and the control main board (5) controls the timer (13) to operate after receiving the electrical signal fed back by the annular pressure detector (95).

8. The bridge displacement detection device for bridge construction according to claim 4, characterized in that: A dust filter screen plate (14) is installed at the bottom of the annular hollow plate (102), and the dust filter screen plate (14) is fixedly connected to the bottom of the circular sleeve (91).

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