Electromagnetic limiting automatic deviation correction device and application thereof in bridge pushing construction

Abstract

The application relates to an electromagnetic position-limiting automatic deviation rectifying device and application thereof in bridge pushing construction, and comprises a fixing device, a movable sliding block, a sliding rail, a sensing device and two pairs of electromagnets; wherein the sensing device controls the on-off of the electromagnets by sensing whether the movable sliding block is located at an initial position; when the sensing device senses the movable sliding block, the sensing device is activated, the bottom end electromagnet of the movable sliding block and the base electromagnet are electrified to fix the movable sliding block, and the fixing end electromagnet and the side surface electromagnet of the movable sliding block are not electrified; when the beam body deviates and contacts the movable sliding block to push the movable sliding block to leave the original position, the sensing device loses the target, the bottom end electromagnet of the movable sliding block and the base electromagnet are de-energized, the fixing end electromagnet and the side surface electromagnet of the movable sliding block are electrified and activated, the same polarity electromagnets repel each other, the beam body is pushed back, and deviation rectification is realized. The device adopts electromagnets to realize automatic deviation rectification, provides a new thought for bridge pushing deviation rectification, and has important contribution to intelligent construction.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge pushing construction, and particularly relates to an electromagnetic limiting automatic deviation rectification device and application thereof in bridge pushing construction. BACKGROUND

[0002] In the process of bridge pushing construction, when the bridge beam deviates from the predetermined pushing route, a limiting device (generally a deviation rectification block) is needed to limit the further deviation of the beam, which is called passive deviation rectification. Then, the pushing needs to be stopped, the deviation rectification amount is manually judged, and the transverse jack on the pushing device is operated to rectify the deviation, which is called active deviation rectification.

[0003] At present, the most commonly used deviation rectification device is a rigid deviation rectification block, which is made of high-strength steel or cast concrete and is fixed on both sides of the pushing track line through high-strength bolts or steel bars to prevent the beam from deviating too much. The traditional deviation rectification block is fixed, and has the following disadvantages: 1. When the bridge pushing length is long, the self-weight is large, and the wind load level is large, a large transverse deviation will occur during pushing. At this time, the collision between the block and the beam can cause the block to deform or even be damaged, and even the beam can be deformed or dislocated, affecting the safety of the construction process; 2. When the beam contacts the block, the pushing must be stopped, the beam and the block are checked, and active deviation rectification is performed before the pushing can continue, which greatly increases the construction period; 3. It is difficult to adjust the position of the fixed block after installation, so the maximum deviation amount during pushing is fixed, and the construction flexibility is poor. SUMMARY

[0004] The purpose of the present application is to provide an electromagnetic limiting automatic deviation rectification device and its application in bridge pushing construction. The device is a movable deviation rectification device with automatic deviation rectification function, which can meet the requirement of limiting the deviation of the beam during pushing by providing deviation rectification force through electromagnetic repulsion.

[0005] The purpose of the present application can be achieved by the following technical solution: an electromagnetic limiting automatic deviation rectification device, comprising a fixed device, a movable sliding block, a sliding track, a sensing device, and an electromagnet.

[0006] The sliding track is installed on the side of the pushing beam on the pushing platform, and its center line is perpendicular to the pushing route; the fixed device is connected to the end of the sliding track away from the beam; the movable sliding block is placed at the starting position of the sliding track close to the beam; the sensing device is arranged at the starting position of the sliding track to sense whether the movable sliding block is at the initial position and control the on-off of the electromagnet.

[0007] The electromagnet comprises a fixed end electromagnet, a movable sliding block side electromagnet, a movable sliding block bottom electromagnet, and a base electromagnet; wherein the fixed end electromagnet and the movable sliding block side electromagnet are same polarity electromagnets, and the movable sliding block bottom electromagnet and the base electromagnet are opposite polarity electromagnets.

[0008] The fixed end electromagnet is set on the side where the fixed device connects to the end of the sliding track. The movable slider side electromagnet is set on the side of the movable slider opposite to the fixed device. The movable slider bottom end electromagnet is embedded inside the movable slider near the bottom surface. The base electromagnet is embedded in the sliding track at the starting position opposite to the movable slider bottom end electromagnet.

[0009] When the beam is not deviated, the sensing device detects that the movable slider is in its initial position, and energizes the electromagnet at the bottom of the movable slider and the electromagnet at the base to fix the movable slider. When the beam deviates and contacts the movable slider, pushing it away from its original position, the sensing device loses its target, the electromagnet at the bottom of the movable slider and the electromagnet at the base are de-energized, and the electromagnet at the fixed end and the electromagnet on the side of the movable slider are energized and activated. The like electromagnets repel each other, causing the beam to push back, thus achieving the correction.

[0010] Furthermore, the fixing device is installed above the fixing device chassis and is connected to the end of the sliding track away from the beam by bolts.

[0011] Furthermore, the movable slider is a cubic insulating block, and the height of the movable slider is higher than the centroid of the beam cross-section.

[0012] Furthermore, a rubber pad is installed on the side of the movable slider that contacts the beam to ensure good contact with the movable slider after the beam shifts, while also serving as a buffer.

[0013] Furthermore, the sliding track is a concave groove, and the bottom of the concave groove of the sliding track is fully covered with polytetrafluoroethylene sheet coated with silicone grease to reduce friction; the top height of the sliding track is lower than the lower edge of the beam, and the length of the sliding track is determined by the allowable deviation range for correction.

[0014] Furthermore, the device also includes a forced limit stop.

[0015] Furthermore, the forced limiting block is fixed at one end of the sliding track near the fixing device, serving as an emergency measure to prevent the beam from exceeding the upper limit of the correction and causing excessive deviation that could damage the fixing device.

[0016] Furthermore, the sensing device is an infrared sensing device used to sense whether the movable slider is in its initial position. The sensing device is connected to a single-pole double-throw switch. The moving end of the single-pole double-throw switch is connected to a power source. The two ends of the single-pole double-throw switch are the stationary ends. One end is connected to the electromagnet at the bottom of the movable slider and the electromagnet at the base, and the other end is connected to the electromagnet at the fixed end and the electromagnet on the side of the movable slider. When the sensing device senses the movable slider in its initial position, the switch is activated, and the electromagnet at the bottom of the movable slider and the electromagnet at the base are energized, while the electromagnet at the fixed end and the electromagnet on the side of the movable slider are de-energized. When the movable slider leaves its initial position, the electromagnet at the bottom of the movable slider and the electromagnet at the base are de-energized, while the electromagnet at the fixed end and the electromagnet on the side of the movable slider are energized.

[0017] Furthermore, the installation positions of the sensing device include the side of the starting position of the sliding track, below the starting position of the sliding track, or suspended directly above the starting position of the sliding track, all of which are directly opposite the movable slider; wherein, when the sensing device is set on the side of the starting position of the sliding track and directly opposite the movable slider, the height of the sensing device is higher than the upper edge of the sliding track to ensure that the sensing device can sense the movable slider; the height of the sensing device is lower than the lower edge of the beam to prevent damage to the device when the beam shifts.

[0018] Furthermore, the size of the electromagnet affects the magnetic force provided, which is determined by the required correction capability, such as the beam mass and jacking force. Two pairs of electromagnets are selected according to the required correction capability, with corresponding shapes, sizes, and thicknesses. The fixed-end electromagnet of the same magnet and the side electromagnet of the movable slider do not exceed the side size of the fixed device and the movable slider, and their assembly positions include inside the fixed device and the movable slider near the side or on the outer surface of the side of the fixed device and the movable slider. The bottom electromagnet of the movable slider and the base electromagnet of the opposite magnet are embedded inside the movable slider and the sliding track. The thickness of the base electromagnet does not exceed the thickness of the bottom surface of the sliding track.

[0019] Furthermore, apart from the electromagnet, all other components in the device are made of insulating, non-magnetic materials, which does not affect the operation of the magnetic poles.

[0020] This invention also provides an application of the above-mentioned electromagnetic limit automatic correction device in bridge jacking construction. The application method is as follows: the device is installed on the side of the jacking beam on the jacking platform, with its center line perpendicular to the jacking route. When the beam has no deviation, the sensing device senses that the movable slider is in the initial position, and the electromagnet at the bottom of the movable slider and the electromagnet at the base are activated by power, thus fixing the movable slider. When the beam deviates and contacts the movable slider, pushing it away from its original position, the sensing device loses its target, the electromagnet at the bottom of the movable slider and the electromagnet at the base are de-energized, and the electromagnet at the fixed end and the electromagnet on the side of the movable slider are activated by power. The like electromagnets repel each other, causing the beam to push back, thus achieving correction.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. The electromagnetic limit automatic correction device of the present invention is a movable correction device that has an automatic correction function and simultaneously meets the requirement of limiting the offset of the beam being pushed, and provides correction force through electromagnetic mutual repulsion.

[0023] 2. The electromagnetic limit automatic correction device of the present invention is used in bridge jacking construction to achieve automatic correction and reduce the workload of manual correction.

[0024] 3. Compared to fixed rigid blocks, once the limiting effect is generated, the beam body has already contacted and squeezed the block, and the jacking must be stopped. The block structure in the electromagnetic limit automatic correction device of the present invention achieves back push correction along with the jacking process, without stopping the jacking work, thus saving construction time.

[0025] 4. The electromagnetic limit automatic correction device of the present invention provides a correction force through electromagnetic mutual repulsion, which reduces the contact between devices, reduces the generation of friction, reduces the vibration of the jacking correction process, and improves the safety of jacking construction.

[0026] 5. The electromagnetic limit automatic correction device of the present invention uses electric energy, is pollution-free, and has low energy consumption. Compared with the failure of fixed rigid blocks after being squeezed, deformed and destroyed, this device can be disassembled and reused.

[0027] 6. The electromagnetic limit automatic correction device of the present invention uses an electromagnet to achieve correction. The correction capability is adjusted by changing the magnetic force according to the current. The correction efficiency is high, which provides a new idea for bridge launching correction. It is expected to be applied in the bridge launching process and plays an important role in promoting the development of correction devices.

[0028] 7. The electromagnetic limit automatic correction device of the present invention realizes automatic correction, which is of great significance for realizing unmanned intelligent construction of bridges. Attached Figure Description

[0029] Figure 1 This is a top view of the electromagnetic limit automatic correction device of the present invention;

[0030] Figure 2 This is a side view of the fixing device of the present invention;

[0031] Figure 3 This is a cross-sectional view of the movable slider and sliding track of the present invention;

[0032] Figure 4 This is a schematic diagram of the device in operation when the beam is not offset.

[0033] Figure 5 This is a schematic diagram of the device when the beam shifts to the point where it begins to contact the movable slider.

[0034] Figure 6 A schematic diagram of the device working when the beam offsets and pushes the movable slider away from its initial position;

[0035] Figure 7 A schematic diagram of the device's operation as the movable slider and beam gradually move closer to the fixed device.

[0036] Figure 8 A schematic diagram of the device when the movable slider and beam are pushed back to their initial positions by magnetic repulsion.

[0037] The following are labeled in the diagram: 1: Fixed device; 2: Fixed end electromagnet; 3: Side electromagnet of the movable slider; 4: Sliding track; 5: Forced limit block; 6: Bottom electromagnet of the movable slider; 7: Base electromagnet; 8: Induction device; 9: Rubber pad; 10: Beam; 11: Fixed device chassis; 12: Movable slider. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that those skilled in the art can make various changes and modifications without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0039] The devices used in the following examples are all commercially available devices.

[0040] Example 1

[0041] See Figures 1-3 This invention discloses an electromagnetic limit automatic correction device. Except for the electromagnet, all other components of the device are made of insulating, non-magnetic materials, which does not affect the operation of the electromagnet. The device includes a fixed device 1, a movable slider 12, a sliding track 4, a forced limit block 5, a sensing device 8, a rubber pad 9, a fixed-end electromagnet 2, a movable slider side electromagnet 3, a movable slider bottom electromagnet 6, and a base electromagnet 7.

[0042] Among them, the fixed-end electromagnet 2 and the movable slider side electromagnet 3 are electromagnets of the same polarity, while the movable slider bottom electromagnet 6 and the base electromagnet 7 are electromagnets of opposite polarities. The fixed-end electromagnet 2 is located on the side where the fixed device 1 connects to the end of the sliding track 4. The movable slider side electromagnet 3 is located on the side of the movable slider 12 opposite to the fixed device 1. The movable slider bottom electromagnet 6 is embedded inside the movable slider 12 near the bottom surface. The base electromagnet 7 is embedded inside the sliding track 4 at the starting position opposite to the movable slider bottom electromagnet 6. The fixed-end electromagnet 2 and the movable slider side electromagnet 3 do not exceed the side size of the fixed device 1 and the movable slider 4, and can be assembled inside the fixed device 1 and the movable slider 4 near the side or on the outer surface of the side of the fixed device 1 and the movable slider 4. The movable slider bottom electromagnet 6 and the base electromagnet 7 are embedded inside the movable slider 12 and the sliding track 4. The thickness of the base electromagnet 7 does not exceed the thickness of the bottom surface of the sliding track 4.

[0043] The movable slider 12 is a cubic insulating block, and its height is higher than the centroid of the beam 10 section. The sliding track 4 is a concave groove, and its bottom is fully covered with PTFE plate coated with silicone grease to reduce friction during offset and pushback. The top of the sliding track 4 is lower than the bottom edge of the beam 10. The forced limit block 5 is fixed at the end of the sliding track 4 near the fixing device 1, which serves as an emergency measure to prevent the beam from exceeding the upper limit of the correction and causing excessive offset that could damage the fixing device. The sensing device 8 is an infrared sensing device connected to a single-pole double-throw switch. The sensing device 8 is set at the starting position of the sliding track 4. The rubber pad 9 is set on the side of the movable slider 4 that contacts the beam after offset, ensuring good contact between the beam and the movable slider after offset, and also serving as a buffer.

[0044] The installation positions of each component in this device are as follows:

[0045] The sliding rail 4 is installed on the side of the jacking beam 10 on the jacking platform, with its center line perpendicular to the jacking route. The fixing device 1 is installed on the fixing device chassis 11 and is connected to the end of the sliding rail 4 away from the beam 10 by bolts. The movable slider 12 is placed at the starting position of the sliding rail 4 near the beam 10. The forced limit block 5 is fixed at one end of the sliding rail 4 near the fixing device 1. The sensing device 8, which is used to sense whether the movable slider 12 is in the initial position and thus control the electromagnet to turn on and off, is set at the starting position of the sliding rail 4.

[0046] The working principle of the sensing device in this apparatus is as follows:

[0047] The sensing device 8 in this apparatus is an infrared sensing device used to sense whether the movable slider is in its initial position. The sensing device is connected to a single-pole double-throw switch. The moving end of the single-pole double-throw switch is connected to the power supply, and the two ends of the single-pole double-throw switch are the stationary ends. One end is connected to the electromagnet 6 at the bottom of the movable slider and the electromagnet 7 at the base, and the other end is connected to the electromagnet 2 at the fixed end and the electromagnet 3 on the side of the movable slider. When the sensing device senses the movable slider at its initial position, the switch is activated, and the electromagnet 6 at the bottom of the movable slider and the electromagnet 7 at the base are energized, fixing the movable slider 12. The electromagnet 2 at the fixed end and the electromagnet 3 on the side of the movable slider are not energized. When the beam 10 deviates and contacts the movable slider 12, pushing it away from its original position, the sensing device 8 loses its target, the electromagnet 6 at the bottom of the movable slider and the electromagnet 7 at the base are de-energized, and the electromagnet 2 at the fixed end and the electromagnet 3 on the side of the movable slider are energized and activated. The like-pole electromagnets repel each other, causing the beam 10 to push back, thus achieving correction.

[0048] The selection of the installation position of the sensing device 8 must meet the requirement of being able to sense the movable slider at the starting position of the sliding track, while ensuring that the sensing device is not damaged after the beam is deviated during the bridge jacking construction. Therefore, the sensing device can be installed on the side of the starting position of the sliding track, directly opposite the movable slider. In this case, the height of the sensing device should be higher than the upper edge of the track, but not higher than the lower edge of the beam. Alternatively, the sensing device can be installed below the starting position of the sliding track or suspended directly above the starting position of the sliding track, directly opposite the movable slider.

[0049] Example 2

[0050] The working principle of the electromagnetic limit automatic correction device for bridge jacking construction of the present invention is as follows:

[0051] like Figure 4 As shown, when the beam 10 has no offset, the movable slider 12 is in the initial position. The sensing device 8 senses the movable slider 12 in the initial position, which triggers the switch connecting the single-pole double-throw switch to the electromagnet 6 at the bottom of the movable slider and the electromagnet 7 at the base. The electromagnet 6 at the bottom of the movable slider and the electromagnet 7 at the base are energized, and the movable slider 12 is fixed in the initial position by mutual electromagnetic attraction. At this time, the electromagnet 2 at the fixed end and the electromagnet 3 on the side of the movable slider are not energized and do not generate magnetism, so they have no effect on the magnetism of the electromagnet 6 at the bottom of the movable slider and the electromagnet 7 at the base.

[0052] like Figure 5 As shown, when the beam 10 is offset to just touch the rubber pad 9 on the surface of the movable slider 12, it begins to push the movable slider 12 to slide. At this time, the single-pole double-throw switch remains unchanged. The electromagnet 6 at the bottom of the movable slider and the electromagnet 7 at the base are energized, while the electromagnet 2 at the fixed end and the electromagnet 3 on the side of the movable slider are not energized.

[0053] like Figure 6As shown, when the beam 10 shifts further, it pushes the movable slider 12 to slide away from the initial position. The sensing device 8 loses its target and is not activated. At this time, the electromagnet 6 at the bottom of the movable slider and the electromagnet 7 at the base are de-energized and released from the slider. The electromagnet 2 at the fixed end and the electromagnet 3 on the side of the movable slider are energized. The electromagnet 2 at the fixed end begins to generate a repulsive force on the electromagnet 3 on the side of the movable slider.

[0054] like Figure 7 As shown, when the movable slider 12 and the beam 10 continue to deviate, the movable slider 12 gradually approaches the fixed device 1. At this time, the magnetic repulsion between the fixed end electromagnet 2 and the movable slider side electromagnet 3 gradually increases, and the offset speed of the beam 10 gradually slows down. When the repulsive force increases to exceed the offset force, the beam 10 is pushed back by the movable slider 12.

[0055] Regarding the issue of the attenuation of the correction force, specifically the gradual decrease in magnetic repulsion as the distance between the fixed-end electromagnet 2 and the movable slider side electromagnet 3 increases, the device appears slightly elongated in the accompanying drawings for better understanding of its working principle. In reality, the width and height of the device are longer than its length. Typically, the lateral deviation of small and medium-sized bridges does not exceed 5cm-10cm, and the correction error is generally controlled at the 2mm level or even 1mm. If the deviation exceeds 5cm, the jacking process needs to be stopped and the problem checked. Therefore, within this distance, the attenuation of the magnetic force is minimal, and appropriate attenuation can prevent excessive acceleration during the back-pushing process from causing secondary deviation in the opposite direction.

[0056] like Figure 8 As shown, when the movable slider 12 is pushed back to a position that the sensor 8 can sense, the sensor 8 is activated. At this time, the fixed end electromagnet 2 and the movable slider side electromagnet 3 are de-energized and no longer continue to correct the deviation. The movable slider bottom end electromagnet 6 and the base electromagnet 7 are energized, attracting the movable slider 12 to reset and fix it. The movable slider 12 separates from the beam, and the device returns to its initial state, thus completing the self-correction process.

[0057] Before the jacking begins, the sliding rail 4 should be properly prepared. Dust, sand and other debris on the sliding rail 4 should be cleaned, and burrs and protrusions on the surface of the sliding rail 4 should be smoothed. Before the jacking operation, a special person should be arranged to check whether the device is working properly. When the device is idle, the current should be disconnected and the sliding rail 4 should be covered with a plastic film and firmly glued to prevent it from being contaminated by water, sand, dust and other contaminants.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic limit automatic correction device, characterized in that, It includes a fixed device (1), a movable slider (12), a sliding rail (4), a sensing device (8), and an electromagnet; The sliding track (4) is installed on the side of the jacking beam (10) on the jacking platform, with its center line perpendicular to the jacking route; the fixing device (1) is connected to the end of the sliding track (4) away from the beam (10), and the movable slider (12) is placed at the starting position of the sliding track (4) close to the beam (10); the sensing device (8) is set at the starting position of the sliding track (4) to sense whether the movable slider (12) is in the initial position, thereby controlling the electromagnet to turn on and off. The electromagnets include a fixed-end electromagnet (2), a movable slider side electromagnet (3), a movable slider bottom electromagnet (6), and a base electromagnet (7); wherein the fixed-end electromagnet (2) and the movable slider side electromagnet (3) are electromagnets of the same polarity, and the movable slider bottom electromagnet (6) and the base electromagnet (7) are electromagnets of opposite polarities. The fixed end electromagnet (2) is set on the side where the fixed device (1) and the sliding track (4) are connected. The movable slider side electromagnet (3) is set on the side opposite to the fixed device (1) of the movable slider (12). The movable slider bottom end electromagnet (6) is embedded in the movable slider (12) near the bottom surface. The base electromagnet (7) is embedded in the sliding track (4) at the starting position opposite to the movable slider bottom end electromagnet (6). When the beam (10) is not deviated, the sensing device (8) senses that the movable slider (12) is in the initial position, and energizes the electromagnet (6) at the bottom of the movable slider and the electromagnet (7) at the base, so that the movable slider (12) is fixed. When the beam (10) deviates and contacts the movable slider (12) and pushes it away from its original position, the sensing device (8) loses its target, the electromagnet (6) at the bottom of the movable slider and the electromagnet (7) at the base are de-energized, the electromagnet (2) at the fixed end and the electromagnet (3) on the side of the movable slider are energized and activated, and the like electromagnets repel each other, so that the beam (10) is pushed back, thus realizing the correction.

2. The electromagnetic limit automatic correction device according to claim 1, characterized in that, The fixing device (1) is installed above the fixing device chassis (11) and is connected to the end of the sliding track (4) away from the beam (10) by bolts.

3. The electromagnetic limit automatic correction device according to claim 1, characterized in that, The movable slider (12) is a cubic insulating block, and the height of the movable slider (12) is higher than the centroid of the beam (10) cross section.

4. The electromagnetic limit automatic correction device according to claim 1, characterized in that, A rubber pad (9) is installed on the side of the movable slider (12) that contacts the beam (10).

5. The electromagnetic limit automatic correction device according to claim 1, characterized in that, The sliding track (4) is a concave groove, and the bottom of the concave groove of the sliding track (4) is fully covered with polytetrafluoroethylene plate coated with silicone grease; the top of the sliding track (4) is lower than the lower edge of the beam (10).

6. The electromagnetic limit automatic correction device according to claim 1, characterized in that, It also includes a forced limiting block (5), which is fixed to one end of the sliding track (4) near the fixing device (1).

7. The electromagnetic limit automatic correction device according to claim 1, characterized in that, The sensing device (8) is an infrared sensing device, and the sensing device (8) is connected to a single-pole double-throw switch.

8. The electromagnetic limit automatic correction device according to claim 1, characterized in that, The fixed end electromagnet (2) and the side electromagnet (3) of the movable slider do not exceed the side size of the fixed device (1) and the movable slider (12), and the assembly position includes the inside of the fixed device (1) and the movable slider (12) near the side or the outer surface of the side of the fixed device (1) and the movable slider (12); the thickness of the base electromagnet (7) does not exceed the bottom thickness of the sliding track (4).

9. The electromagnetic limit automatic correction device according to claim 1, characterized in that, Except for the electromagnet, all other components of the device are made of insulating, non-magnetic materials.

10. The application of the electromagnetic limit automatic correction device as described in claim 1 in bridge jacking construction.

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