Bridge protection device and protection method for underneath passing low-clearance bridge

Abstract

The invention discloses a bridge protection device and method for an underneath pass low-clearance bridge, and relates to the technical field of railway construction, the bridge protection device comprises a bearing frame, the bearing frame comprises two end bearing frames, and a middle bearing frame is arranged between the two end bearing frames; the two side face protection mechanisms are installed on the two end bearing frames correspondingly, the side face protection mechanisms are used for protecting the side faces of the bridge, each side face protection mechanism comprises a side face protection frame installed on the corresponding end bearing frame, the side face protection frames are parallel to the side faces of the bridge, and the sides, close to the bridge, of the side face protection frames are connected with protection gaskets; the device has the beneficial effects that the slidable protection structures are arranged, one protection structure can achieve large-range protection, the number of the needed protection structures is greatly reduced, the overall dead weight of the device is reduced, the occupied space is obviously reduced after the device is disassembled, the protection structures are formed by combining the arc-shaped protection rods and the protection cables, and the protection effect is good. And the impact resistance is relatively good.

Description

Technical Field

[0001] The invention relates to the technical field of railway construction, and in particular to a bridge protection device and a protection method for passing under a low-clearance bridge. Background Art

[0002] Passing under a low-clearance bridge is one of the problems that are easily encountered in railway construction. The common difficulties in the construction of a low-clearance bridge mainly include the low clearance of the bridge, which makes it impossible to use traditional construction methods for railway construction, and the protection of bridge facilities. Among them, it is necessary to focus on the protection of facilities such as bridges and piers to avoid safety accidents and economic losses.

[0003] like Figure 1 and Figure 2 As shown in the figure, during the construction of a certain section of railway in China, it is necessary to cross the bridge of the expressway. There is a highway under the bridge, and the railway is planned to be beside the highway and parallel to the highway. The height between the bottom of the bridge and the ground line is less than 6 meters, and the space is extremely limited. It is necessary to dig a U-shaped groove, and the length of the railway pile is 20 meters. Therefore, it is necessary to use excavators, pile drivers and other equipment during construction. These equipment are relatively high. If the construction workers do not operate them properly during construction, they may collide with the bridge, leaving a safety hazard to the bridge.

[0004] At present, since there are relatively few cases of passing under low-clearance bridges, the protection of the bottom of the bridge is mainly to install rubber pads at the bottom of the bridge, and use rubber pads to achieve the effect of protecting the bridge. The specific operation is to install a protective frame under the bridge and fill rubber pads between the bottom of the bridge and the protective frame. Once the construction equipment collides with the protective frame, the rubber pads can play a good protective effect and greatly reduce the damage to the bridge.

[0005] However, this method also has certain limitations. First, in order to achieve a better protective effect, the interval between the rubber pads should not be too large. Therefore, it is more suitable for situations where the bridge width is relatively narrow or the construction scope is small. If the construction scope is relatively large, a large number of rubber pads are required, and the situation of passing under the bridge is relatively rare, resulting in the storage of these rubber pads taking up a lot of space for a long time. Secondly, the interval between the load-bearing bars at the top of the protective frame is relatively small, which can achieve a better support effect, but this also creates new problems. The rubber pads at the edge are easy to install, while the rubber pads at the center of the protective frame are difficult to install. It is necessary to manually pass the rubber pads through the load-bearing bar interval of the protective frame and place the rubber pads between the protective frame and the bottom of the bridge; or place the rubber pads on the top of the protective frame from the edge of the protective frame, and then move the rubber pads to the center of the protective frame; the former requires more space to be reserved between the protective frame and the bridge, resulting in further compression of the construction height, the need to increase the digging depth, the post-installation speed is slow, and the rubber pads need to be moved slowly. Finally, the filled rubber pads are generally only used for simple fixing or limiting. Once the construction equipment collides with the protective frame and causes damage to the protective frame, the rubber pads may fall off and cause a safety accident. Summary of the invention

[0006] The object of the present invention is to provide a bridge protection device and a protection method for passing under a low-clearance bridge in order to solve the above-mentioned problem.

[0007] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0008] A bridge protection device and protection method for underpassing a low-clearance bridge, comprising:

[0009] The load-bearing frame comprises two end load-bearing frames, and an intermediate load-bearing frame is arranged between the two end load-bearing frames;

[0010] Two side protection mechanisms, which are respectively installed on the two end bearing frames, and are used to protect the sides of the bridge. The side protection mechanisms include side protection frames installed on the end bearing frames, the side protection frames are parallel to the sides of the bridge, and a protection gasket is connected to the side of the side protection frames close to the bridge;

[0011] A top protection mechanism is installed on the top of the load-bearing frame. The top protection mechanism is used to protect the bottom surface of the bridge. The top protection mechanism includes two connecting frames. The connecting frames are fixedly installed on the end load-bearing frames or the middle load-bearing frames. A plurality of protection pipes are arranged at intervals in the horizontal direction between the two connecting frames.

[0012] The emergency protection mechanism is installed above the top protection mechanism. The emergency protection mechanism includes a slide rail installed on the load-bearing frame. The slide rail is slidably equipped with a protection structure. The load-bearing frame is also provided with a traction mechanism for driving the protection structure to slide. A photoelectric sensor for triggering the traction mechanism is provided at the bottom of the connecting frame.

[0013] By adopting the above technical solution, better all-round protection of the bridge can be achieved, the use of rubber pads can be reduced, and the overall weight of the protective device can be significantly reduced. By setting up a side protection mechanism, the side of the bridge can be prevented from being damaged. The construction equipment used in railway construction is relatively high. Before the construction equipment enters under the bridge, the height limit measurement will be carried out. However, during driving, the construction personnel's accidental touch may cause the construction equipment to rise in height, causing the construction equipment to collide with the bridge. The side protection mechanism can avoid the above situation. The top protection mechanism can prevent minor collisions. When the construction equipment approaches the top protection mechanism, the photoelectric sensor is triggered, and the protective structure moves to the top of the triggered photoelectric sensor. Be prepared for emergencies. If the impact force is too large and causes the protective tube to deform, the protective structure can stop the protective tube to avoid damage to the bottom of the bridge.

[0014] As a further improvement, the side protection mechanism includes a mounting block fixedly mounted on the end load-bearing frame, the protection frame is hinged on the mounting block to adjust the inclination angle of the protection frame, the protection frame is also hinged to the adjustment bracket, the other end of the adjustment bracket is hinged to the adjustment block, the adjustment block is connected to the end load-bearing frame by bolts, and the end load-bearing frame is provided with a plurality of adjustment holes that cooperate with the adjustment block.

[0015] By adopting the above technical solution, the adaptability of the side protection mechanism can be improved and the adjustment is convenient. Since the inclination angles of different bridge sides are not exactly the same, the angle of the protection frame can be adjusted, which improves practicality.

[0016] As a further improvement, the connecting frame is provided with a plurality of connecting blocks arranged at intervals, each of which is provided with a slot for installing the protective tube, the opening of the slot is located on the side of the connecting block, and a limiting bolt for limiting the protective tube is installed at the opening of the slot.

[0017] By adopting the above technical solution, the difficulty of the operation is reduced, and construction workers are prevented from working at height for a long time. The protective pipe can be inserted into the slot from the side to quickly complete the initial positioning, and then the limit bolts can be installed. The difficulty of installation and disassembly is relatively low.

[0018] As a further improvement, the protection tube is a hollow tube, and a protective sleeve is provided on the outer side of the protection tube.

[0019] By adopting the above technical solution, the deadweight of the protective device can be reduced, and it is also easier for construction workers to install it. Since the construction is under the bridge, the only construction method currently available is mechanical equipment with manual labor as a supplement. Therefore, the installation of the protective pipe still requires manual installation. The weight of the hollow pipe is relatively light, which reduces the difficulty of manual high-altitude construction work. The protective cover can play a buffering role.

[0020] As a further improvement, the protective structure includes an installation frame, on the inside of which are installed a plurality of protective rods arranged in a horizontal direction. The protective rods are arc-shaped structures with openings facing upward. Above the protective rods are protective cables fixedly connected to the installation frame, and the protective cables are evenly distributed above the protective rods in a horizontal direction.

[0021] By adopting the above technical solution, the impact resistance of the protective structure can be improved. The protective rod is bent downward. When the protective rod is impacted from below, the force from below will make the bent protective rod tend to straighten, and the protective cable will be tightened, playing a stretching role and limiting the further deformation of the protective rod. The protective structure is relatively stable and has good impact resistance.

[0022] As a further improvement, the protection rod is a steel bar, the protection cable is a steel wire rope, and the outer side of the steel wire rope is covered with a rubber sleeve.

[0023] As a further improvement, a rubber pad is also connected to the top of the mounting frame.

[0024] By adopting the above technical solution, it is possible to avoid direct contact between the protective structure and the bottom of the bridge after being damaged.

[0025] As a further improvement, the traction mechanism includes two drums, on which traction ropes are wound, the traction ropes are respectively connected to two ends of the protective structure, and the drums are transmission-connected to a traction motor for driving the drums to rotate.

[0026] The traction mechanism has a relatively simple structure and is easy to install and disassemble.

[0027] As a further improvement, the two ends of the slide rail are bolted to a limit plate, the limit plate is provided with an avoidance hole for the traction rope to pass through, and a fixed pulley for reducing friction is also fixedly mounted on the limit plate.

[0028] A bridge protection method for passing under a low-clearance bridge, using the above-mentioned bridge protection device for passing under a low-clearance bridge, comprises the following steps:

[0029] S1. Install the load-bearing frames. The end load-bearing frames are installed on both sides of the bridge, and the middle load-bearing frame is installed between the end load-bearing frames;

[0030] S2. Adjust the side protection mechanism and adjust the side protection frame to be parallel to the side of the bridge. There is a gap between the side protection frame and the side of the bridge, and the gap is 5-15 cm. After the angle of the side protection frame is adjusted, fix the adjustment block to the end load-bearing frame with bolts to keep the side protection frame at this angle;

[0031] S3. Install the emergency protection mechanism. Install the protection structure in the slide rail from the side. The gap between the protection structure and the bottom of the bridge is 5-15cm. The two ends of the protection structure are connected to the traction ropes. After the protection structure is installed, the limit plates are installed at both ends of the slide rail to prevent the protection structure from falling off. The limit plates are provided with avoidance holes for the traction rope to pass through. Fixed pulleys are also installed on the limit plates. The protection structure can slide left and right under the traction of the traction rope. A photoelectric sensor for triggering the protection structure is provided at the bottom of the connecting frame. When a photoelectric sensor is triggered, the protection structure moves to the top of the photoelectric sensor.

[0032] S4. Install the top protection mechanism, insert the protection tube into the slot from the side, and fix it in place with the limit bolts. It is easy to install. Repeat the protection tube installation operation until all protection tubes are installed.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The present invention basically realizes all-round protection of the bridge by setting up side protection mechanisms and top protection mechanisms. The emergency protection mechanism serves as emergency protection and can prevent the protection pipe from colliding with the bottom of the bridge after being deformed by impact, and the protection effect is good.

[0035] 2. By setting up a sliding protective structure, one protective structure can achieve a larger range of protection, greatly reducing the number of required protective structures, reducing the overall deadweight of the device, and significantly reducing the space occupied after disassembly. The protective structure adopts an arc-shaped protective rod combined with a protective cable, and has relatively better impact resistance.

[0036] 3. The present invention reduces the difficulty of high-altitude operations by optimizing the installation methods of the top protection mechanism and the emergency protection mechanism. The difficulty of installation and disassembly is reduced, which avoids construction workers from working at high altitudes for a long time and reduces safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 This is a construction diagram of a low-clearance bridge under the Figure 1 .

[0039] Figure 2 This is a construction diagram of a low-clearance bridge under the Figure 2 .

[0040] Figure 3 It is a structural schematic diagram of the bridge protection device for passing under a low-clearance bridge according to the present invention.

[0041] Figure 4 It is a structural schematic diagram of the side protection mechanism of the bridge protection device for passing under a low-clearance bridge according to the present invention.

[0042] Figure 5 It is a structural schematic diagram of the top protection mechanism of the bridge protection device for passing under a low-clearance bridge according to the present invention.

[0043] Figure 6 It is a structural schematic diagram of the emergency protection mechanism of the bridge protection device for passing under a low-clearance bridge according to the present invention.

[0044] Figure 7 It is a schematic structural diagram of a protection rod of a bridge protection device for passing under a low-clearance bridge according to the present invention.

[0045] The following are the descriptions of the reference numerals:

[0046] 101. Track; 102. Ground line; 103. Wall top line; 104. Bridge; 105. Pier; 200. Load-bearing frame; 210. End load-bearing frame; 220. Middle load-bearing frame; 300. Side protection mechanism; 301. Mounting block; 302. Side protection frame; 303. Protection gasket; 304. Adjustment bracket; 305. Adjustment block; 400. Top protection mechanism; 410. Connecting frame; 411. Connecting block; 412. Limit bolt; 413. Slot; 420. Protection pipe; 500. Emergency protection mechanism; 510. Mounting frame; 511. Protection cable; 512. Protection rod; 513. Traction rope; 514. Slide rail; 515. Limit plate; 516. Fixed pulley; 517. Reel; 518. Photoelectric sensor. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0048] In the existing construction situation, the situation of passing under bridges is relatively rare, and the situation of passing under low-clearance bridges is even rarer. Some bridges have high clearances, so only the bridge piers need to be protected. When the clearances under the bridges are low, not only the protection of the bridge piers but also the protection of the bridges should be considered. The above situation leads to the advantages and disadvantages of the existing protective devices for passing under bridges being more obvious. The existing protective devices for passing under bridges adopt a protective frame plus rubber pads. Specifically, the protective frame is installed under the bridge, and rubber pads are filled between the protective frame and the bottom of the bridge. The advantage of this protective method is that the structure is simple, and the protective effect is good due to the protection of the rubber pads. However, correspondingly, the existing protective devices for passing under bridges are difficult to apply to the situation where the bridge is wider. At present, the width of many bridges exceeds 30 meters. If all-round protection is to be carried out, a large number of rubber pads are required; and these rubber pads are difficult to install and disassemble during installation and disassembly. Secondly, the number of disassembly and assembly is large. These factors increase the difficulty of disassembly and assembly.

[0049] When using existing protective devices, we found that in most cases, when railway construction equipment collides with the protective frame, the construction workers will feel it and stop immediately, so the protective frame will generally only deform slightly; but because many railway construction equipment are hydraulically driven and the force is very large, if the construction workers fail to react in time, it is possible to cause damage to the bridge and cause hidden dangers; and in the case of limited clearance, it is difficult to give the construction workers a longer reaction time by increasing the distance between the bridge and the protective frame. The provision of rubber pads can play a good buffering role and prevent the deformed protective frame from directly contacting the bottom of the bridge. This is the significance of setting rubber pads.

[0050] In response to the above-mentioned problems, the present invention proposes a double protection method, that is, a top protection mechanism combined with an emergency protection mechanism. The top protection mechanism realizes all-round protection of the bottom of the bridge. The top protection mechanism adopts hollow tubes arranged at intervals, has a light weight, is easy to install and disassemble, and has a certain impact resistance, which can cope with most collision situations. The emergency protection mechanism has a strong impact resistance effect. The protective structure of the emergency protection mechanism can slide on the slide rail (the initial position of the protective structure is located in the middle of the slide rail, which is convenient for moving to both ends and reaching the designated position faster). Once construction equipment reaches the sensing range of the photoelectric sensor, the protective structure slides to the top of the triggered photoelectric sensor to prepare for emergencies. This solution not only realizes all-round protection of the bridge, but also reduces the difficulty of installation and disassembly, greatly reduces the use of rubber pads, and reduces the space required for subsequent recycling and storage of the device.

[0051] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0052] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0053] like Figure 1-Figure 7 As shown, the bridge protection device for passing under a low-clearance bridge includes a load-bearing frame 200, and the load-bearing frame 200 includes two end load-bearing frames 210, and an intermediate load-bearing frame 220 is arranged between the two end load-bearing frames 210. The number of the intermediate load-bearing frames 220 can be adjusted according to the width of the bridge 104; the end load-bearing frames 210 and the intermediate load-bearing frames 220 have the same structure. In this embodiment, the end load-bearing frames 210 include support columns and a top mounting plate installed on the top of the support columns. The length of the support columns buried underground should be greater than the length exposed above the ground. It should be noted that due to the limited clearance under the bridge 104, the support columns in this embodiment are multi-section structures, which are spliced ​​and installed section by section, and each column is connected by a flange or other connection structure.

[0054] like Figure 3 and Figure 4 As shown, each of the two end load-bearing frames 210 is provided with a side protection mechanism 300, which is used to protect the side of the bridge 104. The side protection mechanism 300 includes a mounting block 301 fixedly mounted on the end load-bearing frame 210, and a side protection frame 302 is hinged on the mounting block 301, so as to adjust the angle of the side protection frame 302 so that the side protection frame 302 is parallel to the side of the bridge 104. Since the inclination angles of the sides of different bridges 104 are not exactly the same, the angle of the protection frame can be adjusted, which improves practicality; the side of the side protection frame 302 close to the bridge 104 is connected with a protection gasket 303, which is a rubber gasket, and the side protection frame 302 adopts a hollow structure to reduce its own weight;

[0055] The protective frame is also hinged to the adjustment bracket 304, the other end of the adjustment bracket 304 is hinged to the adjustment block 305, the adjustment block 305 is connected to the end load-bearing frame 210 by bolts, and the end load-bearing frame 210 is provided with a plurality of adjustment holes that cooperate with the adjustment block 305; in other embodiments, the adjustment holes can also be two rectangular holes, and the adjustment block 305 can adjust the position along the length direction of the rectangular holes.

[0056] like Figure 5As shown, the top protection mechanism 400 is installed on the top of the load-bearing frame 200. The top protection mechanism 400 is used to protect the bottom surface of the bridge 104. The top protection mechanism 400 includes two connecting frames 410. The connecting frames 410 are fixedly installed on the end load-bearing frames 210 or the middle load-bearing frames 220. A plurality of protection pipes 420 arranged at intervals in the horizontal direction are arranged between the two connecting frames 410. The connecting frames 410 are provided with a plurality of connecting blocks 411 arranged at intervals. The connecting blocks 411 are provided with a slot 413 for installing the protection pipe 420. The opening of the slot 413 is located on the side of the connecting block 411. The opening of the slot 413 is provided with a limiting bolt 412 for limiting the position of the protection pipe 420. The side opening structure reduces the difficulty of operation and avoids the construction personnel from working at high altitude for a long time. The protection pipe 420 is inserted into the slot 413 from the side, and the initial positioning can be completed quickly. Then, the limiting bolt 412 can be installed. The difficulty of installation and disassembly is relatively low.

[0057] In this embodiment, the protective tube 420 is a hollow tube, and a protective sleeve is provided on the outer side of the protective tube 420. The hollow tube can reduce the deadweight of the protective device and facilitate installation by construction personnel. Since the construction is carried out below the bridge 104, currently only a construction method mainly using mechanical equipment and supplemented by manual labor can be adopted. Therefore, the installation of the protective tube 420 still requires manual installation. The weight of the hollow tube is relatively light, which reduces the difficulty of construction personnel working at high altitude. The protective sleeve can play a buffering role, and the protective sleeve is a rubber sleeve.

[0058] like Figure 6 As shown, the emergency protection mechanism 500 is installed above the top protection mechanism 400. The emergency protection mechanism 500 includes a slide rail 514 installed on the load-bearing frame 200. The slide rail 514 is slidably equipped with a protection structure. The protection structure includes a mounting frame 510. A plurality of protection rods 512 arranged in the horizontal direction are installed on the inner side of the mounting frame 510. The protection rods 512 are steel bars. The protection rods 512 are arc-shaped structures. The protection rods 512 are bent downward, and the opening of the arc-shaped structure faces upward. A protection cable 511 fixedly connected to the mounting frame 510 is provided above the protection rod 512. The protection cable 511 is a steel wire rope. The outer side of the steel wire rope is covered with a rubber sleeve. The protection cable 511 is evenly distributed above the protection rod 512 in the horizontal direction. When the protection rod 512 is impacted from below, the force from below will make the bent protection rod 512 tend to straighten, and the protection cable 511 is taut, which plays a stretching role, thereby limiting further deformation of the protection rod 512 and having a good impact resistance. Components such as steel bars and steel wire ropes are easy to obtain, and can also be made from some scrap steel bars or steel wire ropes at the construction site.

[0059] The load-bearing frame 200 is also provided with a traction mechanism for driving the protective structure to slide, the traction mechanism includes two drums 517, a traction rope 513 is wound around the drums 517, the traction rope 513 is respectively connected to the two ends of the protective structure, and the drums 517 are transmission-connected to a traction motor (not shown) for driving the drums 517 to rotate. The traction mechanism is relatively simple in structure and easy to install and disassemble.

[0060] The two ends of the slide rail 514 are bolted to a limit plate 515, and the limit plate 515 is provided with an avoidance hole for the traction rope 513 to pass through. A fixed pulley 516 is also fixedly installed on the limit plate 515. The fixed pulley 516 is used to change the direction of the force and reduce friction to avoid direct wear between the wire rope and the limit plate 515 or other components.

[0061] A photoelectric sensor 518 for triggering the traction mechanism is provided at the bottom of the connecting frame 410. There are multiple groups of photoelectric sensors 518. The photoelectric sensors 518 and the traction motor are electrically connected to the single-chip controller or other control equipment. The photoelectric sensor 518 includes a transmitting end and a receiving end. When an external object blocks the light source, the light at the receiving end becomes weak, and the resistance or current of the internal components of the receiving end changes (the photoelectric sensor 518 is a prior art, and its specific principle will not be repeated here). Then the single-chip controller drives the protective structure to move to the triggered photoelectric sensor 518 through the traction motor to prepare for emergency protection.

[0062] In other embodiments, a rubber pad is also connected to the top of the mounting frame 510 to prevent the protective structure from directly contacting the bottom of the bridge 104 after being damaged. The thickness of the rubber pad is generally 3 cm.

[0063] This embodiment also discloses a bridge 104 protection method for passing under a low-clearance bridge 104, using the bridge 104 protection device for passing under a low-clearance bridge 104, comprising the following steps:

[0064] S1. Install the load-bearing frame 200. The end load-bearing frames 210 are respectively installed on both sides below the bridge 104, and the middle load-bearing frame 220 is installed between the end load-bearing frames 210. Due to the construction in a low-clearance environment, the support columns of the load-bearing frame 200 are connected by segmented splicing.

[0065] S2. Adjust the side protection mechanism 300, and adjust the side protection frame 302 to be parallel to the side of the bridge 104. A gap is set between the side protection frame 302 and the side of the bridge 104, and the gap is 5-15 cm. After the angle of the side protection frame 302 is adjusted, fix the adjustment block 305 to the end load-bearing frame 210 by bolts to keep the side protection frame 302 at this angle.

[0066] S3. Install the emergency protection mechanism 500, install the protection structure in the slide rail 514 from the side, the gap between the protection structure and the bottom surface of the bridge 104 is 5-15cm, and the two ends of the protection structure are connected to the traction rope 513 respectively. After the protection structure is installed, the limit plates 515 are installed at both ends of the slide rail 514 to prevent the protection structure from falling off. The limit plates 515 are provided with avoidance holes for the traction rope 513 to pass through, and the limit plates 515 are also installed with fixed pulleys 516; the protection structure can slide left and right under the traction of the traction rope 513; the bottom of the connecting frame 410 is provided with a photoelectric sensor 518 for triggering the protection structure. When a photoelectric sensor 518 is triggered, the protection structure moves to the top of the photoelectric sensor 518;

[0067] The initial position of the protective structure is in the middle of the slide rail 514, so that when an accident occurs, the protective structure can move to the designated position faster. The protective principle is: when the railway construction equipment is lifted beyond the set position, it will block the light source of the transmitting end of the photoelectric sensor 518. At this time, the railway construction equipment may continue to be lifted, and the single-chip microcomputer controller drives the protective structure to move to the top of the triggered photoelectric sensor 518 through the traction mechanism (the photoelectric sensors 518 can be numbered first, and when a photoelectric sensor 518 with a certain number is triggered, the single-chip microcomputer controller drives the protective structure to move to the set position through the traction mechanism). If the railway construction equipment triggers two groups of photoelectric sensors 518 at the same time, the protective structure moves to the top of the two groups of photoelectric sensors 518.

[0068] S4. Install the top protection mechanism 400, insert the protection tube 420 into the slot 413 from the side, and fix it in position by the limiting bolt 412. The installation is convenient. Repeat the installation operation of the protection tube 420 until all the protection tubes 420 are installed.

[0069] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A bridge protection device for passing under a low-clearance bridge, characterized in that: include: A load-bearing frame (200), the load-bearing frame (200) comprising two end load-bearing frames (210), and an intermediate load-bearing frame (220) being arranged between the two end load-bearing frames (210); Two side protection mechanisms (300) are respectively installed on two end load-bearing frames (210), the side protection mechanisms (300) are used to protect the side of the bridge (104), the side protection mechanisms (300) include a side protection frame (302) installed on the end load-bearing frame (210), the side protection frame (302) is parallel to the side of the bridge (104), and a protection gasket (303) is connected to the side of the side protection frame (302) close to the bridge (104); A top protection mechanism (400) is installed on the top of a load-bearing frame (200). The top protection mechanism (400) is used to protect the bottom surface of a bridge (104). The top protection mechanism (400) includes two connecting frames (410). The connecting frames (410) are fixedly installed on the end load-bearing frames (210) or the middle load-bearing frames (220). A plurality of protection pipes (420) are arranged at intervals in the horizontal direction between the two connecting frames (410). An emergency protection mechanism (500) is installed above the top protection mechanism (400). The emergency protection mechanism (500) includes a slide rail (514) installed on the load-bearing frame (200). A protection structure is slidably mounted on the slide rail (514). The load-bearing frame (200) is also provided with a traction mechanism for driving the protection structure to slide. A photoelectric sensor (518) for triggering the traction mechanism is provided at the bottom of the connecting frame (410).

2. The bridge (104) protection device for passing under a low-clearance bridge (104) according to claim 1, characterized in that: The side protection mechanism (300) comprises a mounting block (301) fixedly mounted on the end load-bearing frame (210); the protection frame is hinged on the mounting block (301) so as to adjust the tilt angle of the protection frame; the protection frame is also hinged on an adjustment bracket (304); the other end of the adjustment bracket (304) is hinged on an adjustment block (305); the adjustment block (305) is connected to the end load-bearing frame (210) by bolts; and a plurality of adjustment holes cooperating with the adjustment block (305) are provided on the end load-bearing frame (210).

3. The bridge (104) protection device for passing under a low-clearance bridge (104) according to claim 1, characterized in that: The connecting frame (410) is provided with a plurality of connecting blocks (411) arranged at intervals, and the connecting block (411) is provided with a slot (413) for installing the protection tube (420), the opening of the slot (413) is located on the side of the connecting block (411), and a limiting bolt (412) for limiting the position of the protection tube (420) is installed at the opening of the slot (413).

4. The bridge (104) protection device for passing under a low-clearance bridge (104) according to claim 3, characterized in that: The protection tube (420) is a hollow tube, and a protection sleeve is sleeved on the outside of the protection tube (420).

5. The bridge (104) protection device for passing under a low-clearance bridge (104) according to claim 1, characterized in that: The protective structure comprises a mounting frame (510), a plurality of protective rods (512) arranged in a horizontal direction are mounted inside the mounting frame (510), the protective rods (512) are arc-shaped structures, the openings of the arc-shaped structures face upwards, protective cables (511) fixedly connected to the mounting frame (510) are arranged above the protective rods (512), and the protective cables (511) are evenly distributed above the protective rods (512) in a horizontal direction.

6. The bridge (104) protection device for passing under a low-clearance bridge (104) according to claim 5, characterized in that: The protection rod (512) is a steel bar, and the protection cable (511) is a steel wire rope, and the outer side of the steel wire rope is covered with a rubber sleeve.

7. The bridge (104) protection device for passing under a low-clearance bridge (104) according to claim 6, characterized in that: A rubber pad is also connected to the top of the mounting frame (510).

8. The bridge (104) protection device for passing under a low-clearance bridge (104) according to claim 1, characterized in that: The traction mechanism comprises two drums (517), a traction rope (513) is wound around the drums (517), the traction rope (513) is respectively connected to two ends of the protection structure, and the drums (517) are transmission-connected to a traction motor for driving the drums (517) to rotate.

9. The bridge (104) protection device for passing under a low-clearance bridge (104) according to claim 8, characterized in that: The two ends of the slide rail (514) are bolted to a limit plate (515), the limit plate (515) is provided with an avoidance hole for the traction rope (513) to pass through, and a fixed pulley (516) for reducing friction is also fixedly mounted on the limit plate (515).

10. A method for protecting a bridge (104) for passing under a low-clearance bridge (104), using the bridge (104) protection device for passing under a low-clearance bridge (104) as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Install the load-bearing frame (200), the end load-bearing frames (210) are respectively installed on both sides below the bridge (104), and the middle load-bearing frame (220) is installed between the end load-bearing frames (210); S2. The side protection mechanism (300) is adjusted to make the side protection frame (302) parallel to the side of the bridge (104). A gap is provided between the side protection frame (302) and the side of the bridge (104). The gap is 5-15 cm. After the angle of the side protection frame (302) is adjusted, the adjustment block (305) is fixed to the end load-bearing frame (210) by bolts to keep the side protection frame (302) at the angle; S3. Install the emergency protection mechanism (500), install the protection structure in the slide rail (514) from the side, the gap between the protection structure and the bottom surface of the bridge (104) is 5-15 cm, and the two ends of the protection structure are respectively connected to the traction rope (513). After the protection structure is installed, the limit plates (515) are installed at both ends of the slide rail (514) to prevent the protection structure from falling off. The limit plates (515) are provided with avoidance holes for the traction rope (513) to pass through, and the limit plates (515) are also installed with fixed pulleys (516); the protection structure can slide left and right under the traction of the traction rope (513); the bottom of the connecting frame (410) is provided with a photoelectric sensor (518) for triggering the protection structure. When a photoelectric sensor (518) is triggered, the protection structure moves to the top of the photoelectric sensor (518); S4. Install the top protection mechanism (400), insert the protection tube (420) into the slot (413) from the side, and fix it in position by the limiting bolt (412). The installation is convenient. Then repeat the installation operation of the protection tube (420) until all the protection tubes (420) are installed.

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