Safety lifting tool for ascending and descending bridge

Abstract

The application provides a bridge railing bridge ascending and descending safety lifting tool, which comprises a mounting frame, a pulley seat and a lifting assembly; the mounting frame is erected above a bridge, the bottom corners of the mounting frame are provided with connecting pieces, a plurality of connecting pieces are connected with rails above the bridge respectively; the pulley seat is installed at the edge of the bridge, and a first fixed pulley is arranged on the pulley seat; the lifting assembly comprises a first lifting rope and a winch driving piece; the winch driving piece is installed at the top of the mounting frame, the winch driving piece is connected with the top end of the lifting rope, the winch axis is parallel to the horizontal direction, and the bottom end of the first lifting rope is connected with the railing by passing through the first fixed pulley. The bridge railing bridge ascending and descending safety lifting tool provided by the application has the advantages that the mounting frame is installed on the bridge, occupies less space, the railing can ascend and descend the bridge by using the bridge, the use space is saved, the tool is not affected by the environment below the bridge, has high applicability, and the work efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of bridge engineering technology, specifically relating to a safety lifting device for bridge railings going up and down the bridge. Background Technology

[0002] During the long-term use of urban and highway bridges, the guardrails on both sides often break down earlier due to the material. Therefore, the replacement and maintenance of guardrails is an important and frequent task in bridge maintenance.

[0003] In guardrail replacement work, moving the new guardrails onto the bridge and the old guardrails from the bridge to the ground are crucial steps affecting replacement efficiency. Conventional methods include using a suspended platform or a hoisting machine to transport the guardrails. Using a suspended platform requires workers to move the guardrails together, the space in the platform is limited, and prolonged work can easily lead to worker fatigue, affecting construction efficiency. The platform needs to be built in advance, and the process of changing the work site is cumbersome and inefficient. Using a hoisting machine requires clearing the space for the hoisting machine to move in advance and ensuring the foundation's bearing capacity. In urban areas or environments with limited construction space, it is difficult to move the hoisting machine along the extension direction of the bridge, and hoisting machines are costly and have significant limitations. Utility Model Content

[0004] This application provides a safety lifting device for bridge railings, aiming to solve the technical problems in the prior art where using a suspended basket to move the railings easily leads to technician fatigue, and the lifting method using a hoist has great limitations.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] A safety lifting fixture for bridge railings is provided, comprising:

[0007] The frame is installed and erected above the bridge, and connected to the steel rails above the bridge.

[0008] A pulley seat, installed at the edge of the bridge, is provided with a first fixed pulley; and

[0009] The lifting assembly includes a first lifting rope and a winch drive. The winch drive is mounted on the mounting frame and is connected to one end of the lifting rope, with the winch axis parallel to the horizontal direction. The other end of the first lifting rope passes around the first fixed pulley and is connected to the railing.

[0010] In one possible implementation, the bottom of the pulley seat is a U-shaped connecting plate with the opening facing downwards. The pulley seat is installed on the edge of the bridge, and the opening is inserted into the edge protrusion of the bridge. The first fixed pulley is located at the corner of the U-shaped connecting plate, and the connecting seat of the first fixed pulley is inclined from bottom to top in a direction away from the bridge.

[0011] In one possible implementation, the first fixed pulley includes a first mounting base and a first pulley, the first pulley being rotatably connected to the first mounting base, the first mounting base being fixed to the top of the pulley base, the top of the first mounting base having a detachable anti-detachment pin, the anti-detachment pin and the first mounting base enclosing a limiting space for the first lifting rope, so as to restrict the first lifting rope from detaching upward from the first pulley.

[0012] In one possible implementation, the installation framework includes:

[0013] The base, installed on top of the bridge, has connection holes at its corners.

[0014] A connector, passing through the connecting hole and connecting to the base, wherein the bottom of the connector is engaged with the steel rail of the bridge; and

[0015] A support frame is provided on the base, the support frame has an installation space, and the hoist drive is provided within the installation space.

[0016] In one possible implementation, the connector includes a horizontal bar, a vertical bar, and a connecting bolt; the horizontal bar and the vertical bar are integrally cast, the top of the vertical bar extends upward through the connecting hole and is screwed to the connecting bolt, the horizontal bar has a snap-fit ​​groove with an opening facing outwards, the snap-fit ​​groove snaps into the bottom of the bridge rail, and the connecting bolt and the snap-fit ​​groove cooperate to clamp the rail in the vertical direction.

[0017] In one possible implementation, the pulley seat is further provided with a second fixed pulley, the second fixed pulley and the first fixed pulley are spaced apart along the length of the bridge, and the rotation axis of the second fixed pulley overlaps with the rotation axis of the first fixed pulley;

[0018] The bridge railing safety lifting device for going up and down the bridge also includes an anti-detachment component, which includes:

[0019] Anti-detachment hooks are installed on the mounting frame;

[0020] The anti-detachment device, one end of which engages with the anti-detachment hook; and

[0021] The second lifting rope has one end connected to the other end of the anti-detachment device, and the other end of the second lifting rope passes around the second fixed pulley and is connected to the railing.

[0022] In one possible implementation, the bottom of the first lifting rope is provided with a connecting hook, which is attached to the railing.

[0023] In one possible implementation, the winch drive is a hand-cranked winch.

[0024] In one possible implementation, the direction of movement of the first lifting rope is perpendicular to the length direction of the bridge.

[0025] In one possible implementation, the bottom end of the second lifting rope is flush with the bottom end of the first lifting rope, so that the railing can be raised and lowered horizontally.

[0026] The bridge railing lifting safety device provided in this application, compared with existing technologies, features an installation frame connected to the steel rails above the bridge, and pulley seats installed at the bridge edge. During the ascent, an employee at the bottom of the bridge connects the railing to the first lifting rope, while an employee at the top of the bridge operates a winch drive to raise the first lifting rope, thus lifting the railing. During descent, an employee at the top of the bridge operates the winch drive to lower the railing using the first lifting rope. The installation frame is mounted on the bridge, occupying minimal space, and its connection to the steel rails allows for railing ascent and descent using the bridge itself, saving space and being unaffected by the environment below the bridge. This device is applicable to various situations. Wide range of applications; the fixed installation frame on the steel rails eliminates the cost and transportation of counterweights, saving transportation costs and improving work efficiency; employees on and under the bridge can move freely in their respective safe areas without frequent crossings, reducing labor intensity; employees under the bridge do not need to move with the railings, and employees on the bridge can operate the winch drive from a relatively fixed position, reducing unnecessary movement and physical exertion, lowering employee fatigue, and helping to maintain construction efficiency; compared with hoisting machines, the manufacturing and operating costs of this application are low, and it is not limited by urban areas or limited construction space, making it more applicable and with lower construction costs; the installation frame is connected to the steel rails. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A front view structural schematic diagram of a bridge railing safety lifting device for going up and down the bridge provided in an embodiment of this application;

[0029] Figure 2 for Figure 1 Top view;

[0030] Figure 3 for Figure 1 Side view of the pulley seat used in the design;

[0031] Figure 4 for Figure 1 A cross-sectional view of the pulley seat used in the design;

[0032] Figure 5 for Figure 1 Assembly diagram of the mounting frame and pulley seat used in the process;

[0033] Figure 6 for Figure 5 A top view of the assembly of the connectors and rails used in the process;

[0034] Figure 7 for Figure 5 Top view;

[0035] Figure 8 for Figure 5 A schematic diagram of the connectors used in the process;

[0036] Figure 9 A structural schematic diagram of a bridge railing safety lifting device for going up and down the bridge, provided in another embodiment of this application;

[0037] Figure 10 for Figure 9 A schematic diagram of the mounting base used in the design.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Mounting frame; 11. Base; 12. Support frame; 13. Connector; 131. Horizontal bar; 132. Vertical bar; 133. Snap-fit ​​groove; 134. Connecting bolt;

[0040] 2. Pulley seat; 21. First fixed pulley; 211. First mounting base; 212. First pulley; 22. Second fixed pulley; 23. Anti-detachment pin; 24. Heightening block;

[0041] 3. Lifting assembly; 31. Hoisting drive unit; 32. First lifting rope;

[0042] 4. Anti-detachment component; 41. Anti-detachment hook; 42. Anti-detachment device; 43. Second lifting rope;

[0043] 5. Bridge; 51. Rail. Detailed Implementation

[0044] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is actually illustrative only and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0046] It should be noted that the terms "length," "width," "height," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0047] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0049] When using existing bridge railings to move them up and down the bridge using a hoist, the hoist needs to move along the bridge's extension direction to move the railings to the preset installation or dismantling position. Hoisting machines occupy a large area, and in urban areas or locations with limited installation space, they often cannot be moved to the correct position, increasing the difficulty of moving the railings up and down the bridge. Furthermore, the heavy weight of the hoisting machines often exceeds the bearing capacity of the bridge's foundation. Using a suspended platform, the platform and supporting facilities need to move along the bridge's extension direction. Workers must move the railings up and down the bridge from inside the platform, making the movement of the supporting facilities cumbersome and involving many steps. Both of these solutions also suffer from high construction costs and the need for regular equipment maintenance.

[0050] Please refer to the following: Figures 1 to 10 The safety lifting fixture for bridge railings provided in this application is described below. The safety lifting fixture for bridge railings includes an installation frame 1, a pulley seat 2, and a lifting assembly 3. The installation frame 1 is erected above the bridge 5 and connected to the steel rail 51 above the bridge 5; the pulley seat 2 is installed on the edge of the bridge 5, and a first fixed pulley 21 is provided on the pulley seat 2; the lifting assembly 3 includes a first lifting rope 32 and a winch drive 31. The winch drive 31 is installed on the installation frame 1, and one end of the winch drive 31 is connected to the lifting rope, with the winch axis parallel to the horizontal direction. The other end of the first lifting rope 32 passes around the first fixed pulley 21 and is connected to the railing.

[0051] It should be noted that the mounting frame 1 is fixed to the steel rail 51 of the bridge 5 by the connector 13. The pulley seat 2 is installed on the bridge 5. No additional counterweight is required. The stability of the mounting frame 1 is ensured by the weight of the steel rail 51 itself and the connection strength with the bridge 5. The extension direction of the steel rail 51 is parallel to the extension direction of the bridge 5, and the extension direction of the bridge 5 is parallel to the length direction of the bridge 5.

[0052] It should be noted that the first lifting rope 32 in this embodiment can lift the new railing from the bottom of the bridge to the top of the bridge, and can also lower the old railing and damaged railing from the bottom of the bridge to the bottom of the bridge.

[0053] In practice, the mounting frame 1 and the pulley seat 2 are spaced apart in the width direction of the bridge 5.

[0054] The bridge railing lifting safety device provided in this embodiment, compared with the prior art, has a different design. The mounting frame 1 is connected to the steel rail 51 above the bridge 5, and the pulley seat 2 is installed on the edge of the bridge 5. During the ascent, an employee at the bottom of the bridge connects the railing to the first lifting rope 32, while an employee at the top of the bridge 5 operates the winch drive 31 to raise the first lifting rope 32, thereby raising the railing. During descent, the employee at the top of the bridge 5 operates the winch drive 31 to lower the first lifting rope 32. The mounting frame 1 is installed on the bridge 5, occupying little space. Furthermore, the connection between the mounting frame 1 and the steel rail 51 on the bridge 5 allows for the railing to be lifted and lowered using only the bridge 5, saving space and eliminating the need for additional equipment below the bridge 5. Due to environmental factors, this device has a wide range of applications; the steel rail 51 is fixedly installed on the frame 1, which can save the cost and transportation of counterweights, thus saving transportation costs and improving work efficiency; employees on and under the bridge can move freely in their respective safe areas without having to frequently go up and down the bridge, reducing labor intensity; employees under the bridge do not need to move with the railing, and employees on the bridge can operate the winch drive 31 from a relatively fixed position, reducing unnecessary movement and physical exertion, reducing employee fatigue, and helping to maintain construction efficiency; compared with hoisting machines, the manufacturing and operating costs of this application are low, and it is not limited by urban areas or limited construction space, making it more applicable and with lower construction costs; the installation frame 1 is connected to the steel rail 51.

[0055] In some embodiments, see Figure 3 and Figure 4 The bottom of the pulley seat 2 is a U-shaped connecting plate with the opening facing downwards. The pulley seat 2 is installed on the edge of the bridge 5, and the opening is inserted into the edge of the bridge 5. The first fixed pulley 21 is located at the corner of the U-shaped connecting plate, and the connecting seat of the first fixed pulley 21 is inclined from bottom to top in a direction away from the bridge 5.

[0056] In practice, the bottom two side plates of the pulley seat 2 abut against the two walls of the retaining wall at the edge of the bridge 5, thereby increasing the stability of use.

[0057] In this embodiment, through a plug-in connection, the pulley seat 2 can be tightly connected to the edge of the bridge 5, effectively preventing horizontal displacement or swaying of the lifting device during use, ensuring the stability of the entire lifting device on the bridge 5, and thus guaranteeing the safe operation of raising and lowering the railing. The inclined first fixed pulley 21 can better adapt to the movement path of the railing. It can make the direction of the lifting rope more consistent with the movement direction of the railing, avoiding interference between the lifting rope and other components. Since the connection between the pulley seat 2 and the edge of the bridge 5 is relatively simple and stable, the lifting device can be easily disassembled after completing one railing raising and lowering operation and reused on other bridges 5, improving resource utilization.

[0058] In some embodiments, see Figure 9 and Figure 10 The top of the pulley seat 2 is provided with a heightening block 24, and the upper part of the heightening block 24 is provided with a first fixed pulley 21. The heightening block 24 can change the height of the first fixed pulley 21, making it convenient for employees to lower the old railing.

[0059] In practice, the heightening block 24 is fixed on the pulley seat 2 to increase the structural strength.

[0060] In some embodiments, see Figure 3 and Figure 4 The first fixed pulley 21 includes a first mounting base 211 and a first pulley 212. The first pulley 212 is rotatably connected to the first mounting base 211, which is fixed to the top of the pulley seat 2. The top of the first mounting base 211 has a detachable anti-detachment pin 23. The anti-detachment pin 23 and the first mounting base 211 enclose a limiting space for the first lifting rope 32, preventing the first lifting rope 32 from detaching upward from the first pulley 212. Once the first lifting rope 32 shows a tendency to detach upward, the anti-detachment pin 23 will prevent it from moving further, avoiding the first lifting rope 32 from falling off the fixed pulley, thereby preventing the railing from falling suddenly and ensuring the safety of the workers and the surrounding environment. The anti-detachment pin 23 ensures that the first lifting rope 32 will not detach from the fixed pulley, so that the pulling force transmitted by the winch drive 31 through the first lifting rope 32 can act stably and effectively on the railing, reducing the time for work interruption and readjustment caused by the first lifting rope 32 detaching. During routine inspections, staff can disassemble the anti-detachment pin 23 to more comprehensively check the working status of the first fixed pulley 21 and the first lifting rope 32, promptly identify potential safety hazards such as wear on the lifting rope and damage to the fixed pulley, and take corresponding measures to address them, ensuring that the lifting equipment is always in a safe and reliable operating state.

[0061] In specific implementation, the first mounting base 211 has two vertical plates, which are spaced apart along the extension direction of the bridge 5. One end of the anti-detachment pin 23 is sway-connected to one of the vertical plates of the first mounting base 211, with the sway axis perpendicular to the rotation axis of the first pulley 212. The other end is detachably connected to the other vertical plate of the first mounting base 211. The detachment method is screw connection or snap-fit ​​connection, or a pin is used to insert the anti-detachment pin 23. The pin and the vertical plate are in contact, restricting the movement of the anti-detachment pin 23.

[0062] In some embodiments, see Figures 5 to 7The mounting frame 1 also includes a base 11, a connector 13, and a support frame 12. The base 11 is installed on the top of the bridge 5, and connection holes are provided at the corners of the base 11. The connector 13 connects to the base 11 through its connection holes, and the bottom of the connector 13 engages with the rail 51 of the bridge 5. The support frame 12 is mounted on the base 11 and has installation space, within which the winch drive unit 31 is located. The base 11, installed on the top of the bridge 5, increases the contact area between the mounting frame 1 and the bridge 5. The support of the base 11 evenly distributes the weight of the lifting fixture and the force generated when lifting the railing to the top of the bridge 5, preventing excessive local pressure from damaging the bridge 5 structure. It also enhances the stability of the entire lifting fixture on the bridge 5, making it less prone to shaking or displacement during operation. The connection holes at the corners of the base 11 provide reliable fixing points for the mounting frame 1. The connector 13 connects to the rail 51 above the bridge 5, firmly fixing the mounting frame 1 to the bridge 5 and further improving the stability of the lifting fixture.

[0063] It should be noted that the mounting frame 1 of this application is made of welded steel pipes or square tubes. The preferred option is to use 4*6cm square tubes for welding. The material is widely available, the overall weight is light, and it is easy to move on the bridge 5. This solution only requires a winch drive unit 31, fixed pulleys, and mounting frame 1, which is inexpensive and can save on construction costs. In case of equipment damage, maintenance is convenient or direct replacement is possible, reducing economic losses.

[0064] In practical implementation, the base 11 and support frame 12 form a modular structure, which is convenient to adjust and expand according to the actual conditions of different bridges 5 and the specific needs of the railings going up and down the bridge. The appropriate size of the base 11 and support frame 12 can be selected according to the width and height of the bridge 5, or the structure of the support frame 12 can be improved to adapt to different types of hoisting drive components 31, thereby improving the versatility and adaptability of the lifting fixture.

[0065] In some embodiments, see Figure 8 The connector 13 includes a horizontal rod 131, a vertical rod 132, and a connecting bolt 134. The horizontal rod 131 and the vertical rod 132 are integrally cast. The top of the vertical rod 132 passes through the connecting hole and is screwed to the connecting bolt 134. The horizontal rod 131 has a snap-fit ​​groove 133 with the opening facing. The snap-fit ​​groove 133 snaps into the bottom of the rail 51 of the bridge 5. The connecting bolt 134 and the snap-fit ​​groove 133 cooperate to clamp the rail 51 in the vertical direction.

[0066] The connector 13 provided in this embodiment has a simple structure. The horizontal rod 131 and the vertical rod 132 of the connector 13 are integrally cast, which ensures the overall strength and stability of the connector 13. The snap-fit ​​groove 133 on the horizontal rod 131 snaps into the bottom of the rail 51 of the bridge 5, increasing the contact area and friction. The snap-fit ​​groove 133 can tightly hold the bottom of the rail 51, effectively preventing the connector 13 from sliding or displacing in the horizontal direction, ensuring the stability and safety of the lifting fixture. The horizontal rods 131 of the two connectors 13 located on the same side of the support frame 12 are mirrored and connected to the rail 51 on the bridge 5. The symmetrical structure allows the connectors 13 to be evenly distributed on both sides of the rail 51 when under force, avoiding local stress concentration caused by uneven force. The connectors 13 on both sides cooperate with each other and work together to further enhance the connection stability between the lifting fixture and the bridge 5. After the vertical rod 132 is inserted into the connecting hole at the corner of the base 11, it is screwed onto the connecting bolt 134, allowing construction workers to quickly install the connector 13 onto the base 11. During installation, no complex adjustments or positioning are required, greatly improving installation efficiency and reducing construction time and labor costs.

[0067] In specific implementation, four connection holes are provided. The base 11 is divided into a first side and a second side along the extension direction of the bridge 5. Both the first side and the second side are provided with two connection holes. The two vertical rods 132 and the two horizontal rods 131 on the same side cooperate to clamp the rail 51 from multiple directions, so that the rail 51 is firmly fixed to the base 11. The rail 51 acts as a counterweight to prevent the base 11 from moving.

[0068] During installation, multiple connectors 13 are staggered in sequence along the extension direction of the bridge 5 to engage with the rail 51 on both sides, so that the base 11 will not sway in the width direction of the bridge 5.

[0069] In some embodiments, see Figures 1 to 3 The pulley seat 2 is also equipped with a second fixed pulley 22. The second fixed pulley 22 and the first fixed pulley 21 are spaced apart along the length of the bridge 5, and the rotation axis of the second fixed pulley 22 overlaps with the rotation axis of the first fixed pulley 21. The safety lifting fixture for the bridge railing also includes an anti-detachment component 4, which includes an anti-detachment hook 41, an anti-detachment device 42, and a second lifting rope 43. The anti-detachment hook 41 is installed on the installation frame 1; one end of the anti-detachment device 42 is engaged with the anti-detachment hook 41; one end of the second lifting rope 43 is connected to the other end of the anti-detachment device 42, and the other end of the second lifting rope 43 passes around the second fixed pulley 22 and is connected to the railing.

[0070] It should be noted that the anti-fall device 42 uses existing fall arresters, such as the MSE fall arrester. The fall arrester can quickly brake and lock the falling object within a limited distance. Its principle and internal structure are publicly available technologies and will not be described in detail here.

[0071] This implementation provides an anti-detachment component 4, with a second fixed pulley 22 lifting the railing via a second lifting rope 43. Even if the first lifting rope 32 malfunctions (e.g., breaks or loosens), the second lifting rope 43 can still maintain the railing's position, preventing it from suddenly falling and significantly reducing the risk of accidents, thus protecting the lives of construction workers and surrounding facilities. The two lifting ropes distribute the railing's weight more evenly during lifting, preventing tilting or swaying due to uneven force. This ensures stable movement of the railing during its ascent and descent, improving the stability of the lifting operation and facilitating the smooth completion of railing replacement work.

[0072] In some embodiments, the bottom of the first lifting rope 32 is provided with a connecting hook, which is attached to the railing. The connecting hook securely locks the first lifting rope 32 to the railing, effectively preventing them from separating during lifting and ensuring the safety and stability of the operation. Using the connecting hook allows for convenient and quick connection or disconnection of the first lifting rope 32 from the railing, improving work efficiency.

[0073] In practice, the buckle uses a spring hook for easy connection to the railing, or other hooks can be used to connect to the hanging points on the railing, as long as it is convenient to connect to the railing.

[0074] When in use, the bottom end of the first lifting rope 32 can be wrapped around the railing and tied, and then the buckle can be used to fasten it to the first lifting rope 32 to increase the lifting stability.

[0075] In some embodiments, the winch drive 31 is a hand-cranked winch. Hand-cranked winches are simple in structure, inexpensive, and lack complex electrical systems and power units. They have low maintenance costs, are easy to operate, and can precisely control the lifting speed and position of the guardrail according to actual conditions.

[0076] Specifically, the hand-cranked winch has a rotating shaft and a hand crank. The rotating shaft is rotatably mounted in the installation space of the support frame 12. One end of the hand crank is fixed coaxially with the rotating shaft, and the other end swings around the rotation axis of the rotating shaft. The hand crank is located on one side of the support frame 12 for easy hand cranking by employees.

[0077] The winch drive unit 31 can also be an electrically controlled winch.

[0078] In some embodiments, see Figure 2The first lifting rope 32 moves perpendicular to the length of the bridge 5. When the winch drive 31 pulls the railing via the first lifting rope 32, the force is applied more directly and effectively, reducing the loss of force due to the inconsistency between the lifting direction and the railing's movement direction. This allows the railing to be lifted up and down the bridge more efficiently, improving the overall work efficiency. It also prevents the railing from shifting along the length of the bridge 5 during the lifting process. Because the first lifting rope 32 applies tension perpendicular to the length of the bridge 5, it better constrains the railing's movement trajectory, improving the accuracy of the railing's installation position.

[0079] In some embodiments, the bottom end of the second lifting rope 43 is flush with the bottom end of the first lifting rope 32 to allow the railing to rise and fall horizontally. When their bottom ends are flush, the points of application of the pulling force on the railing are at the same horizontal height, making the pulling force on the railing more balanced in the vertical direction. This avoids the railing tilting or swaying due to different heights of the points of application of the pulling force, ensuring that the railing can move smoothly up and down during the lifting process and reducing the safety risks that may be caused by the swaying of the railing. During normal lifting, both lifting ropes can function normally; and if the first lifting rope 32 malfunctions, the second lifting rope 43 can immediately take over and quickly assume the task of lifting the railing, because their bottom ends are flush, ensuring that they can play an anti-derailment role at the first moment and ensuring the safety of the railing.

[0080] The following is a specific embodiment of this application:

[0081] A safety lifting device for bridge railings is disclosed, comprising a 4*6cm square tube welded to form an installation frame 1. The entire device is 600mm high, with a base 11 measuring 480*500mm. A hand-cranked winch wheel with a diameter of φ360mm is installed, and a winch drive component 31 is embedded in the frame. Connectors 13 are located at the four corners of the base 11 of the installation frame 1. The upper half of the top of each connector 13 is threaded and can be tightened with nuts. A 2cm thick rope is wound around the winch drive component 31, with a hook at one end for attaching a fall arrestor. The pulley seat 2 is made of 1cm thick steel plate bent into shape. The pulley seat 2 is 400mm long and the inner width is larger than that of the retaining wall. The outer steel plate of the retaining wall is 400mm wide and the inner steel plate of the retaining wall is 160mm wide. The first fixed pulley 21 and the second fixed pulley 22 are welded on the pulley seat 2. The distance between the first fixed pulley 21 and the second fixed pulley 22 is determined according to the distance between the fall arrester and the winch drive component 31. The first fixed pulley 21 and the second fixed pulley 22 are equipped with anti-derailment devices. The anti-derailment stop bar is fixed to the wheel support by the anti-derailment pin 23.

[0082] When installing the new railing on the bridge, place this device between two sleepers, connect the connector 13 to the rail 51, tighten the nut, and attach the double nut. Hook the fall arrestor onto the corresponding hook. Fix the pulley seat 2 to the corresponding position and hang it on the retaining wall. Pass the first lifting rope 32 and the second lifting rope 43 around the first fixed pulley 21 and the second fixed pulley 22 respectively. Lower the first lifting rope 32 and the second lifting rope 43 to the ground. Ground operators simultaneously hang the first lifting rope 32 and the second lifting rope 43 on the steel structure. Bridge workers operate the winch drive 31, and the railing rises to the bridge deck at a uniform speed.

[0083] When the old railing is lowered off the bridge, a heightening block 24 is installed on the pulley seat 2. The height of the heightening block 24 is controlled according to the requirements. The heightening block 24 is fixed on the pulley seat 2. If the railing suddenly drops, the fall arrestor will lock up quickly. Then the winch drive 31 will be slightly lifted, the fall arrestor will lock up and open. The output end of the winch drive 31 will rotate in the opposite direction at a constant speed, and the old railing will descend at a constant speed until it reaches the ground.

[0084] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A safety lifting device for bridge railings, characterized in that, include: The frame is installed and erected above the bridge, and connected to the steel rails above the bridge. A pulley seat, installed at the edge of the bridge, is provided with a first fixed pulley; and The lifting assembly includes a first lifting rope and a winch drive. The winch drive is mounted on the mounting frame and is connected to one end of the lifting rope, with the winch axis parallel to the horizontal direction. The other end of the first lifting rope passes around the first fixed pulley and is connected to the railing.

2. The bridge railing safety lifting device for going up and down the bridge as described in claim 1, characterized in that, The bottom of the pulley seat is a U-shaped connecting plate with the opening facing downwards. The pulley seat is installed on the edge of the bridge, and the opening is inserted into the edge of the bridge. The first fixed pulley is located at the corner of the U-shaped connecting plate, and the connecting seat of the first fixed pulley is inclined from bottom to top in the direction away from the bridge.

3. The bridge railing safety lifting device for going up and down the bridge as described in claim 2, characterized in that, The first fixed pulley includes a first mounting base and a first pulley. The first pulley is rotatably connected to the first mounting base. The first mounting base is fixed to the top of the pulley base. The top of the first mounting base has a detachable anti-detachment pin. The anti-detachment pin and the first mounting base enclose a limiting space for the first lifting rope to prevent the first lifting rope from detaching upward from the first pulley.

4. The bridge railing safety lifting device for going up and down the bridge as described in claim 1, characterized in that, The installation framework includes: The base, installed on top of the bridge, has connection holes at its corners. A connector, passing through the connecting hole and connecting to the base, wherein the bottom of the connector is engaged with the steel rail of the bridge; and A support frame is provided on the base, the support frame has an installation space, and the hoist drive is provided within the installation space.

5. The bridge railing safety lifting device for going up and down the bridge as described in claim 4, characterized in that, The connector includes a horizontal rod, a vertical rod, and a connecting bolt; the horizontal rod and the vertical rod are integrally cast, the top of the vertical rod extends upward through the connecting hole and is screwed to the connecting bolt, the horizontal rod has a snap-fit ​​groove with an opening facing the bottom of the bridge rail, the snap-fit ​​groove snaps into the bottom of the bridge rail, and the connecting bolt and the snap-fit ​​groove cooperate to clamp the rail in the vertical direction.

6. The bridge railing safety lifting device for going up and down the bridge as described in claim 1, characterized in that, The pulley seat is also provided with a second fixed pulley, which is spaced apart from the first fixed pulley along the length of the bridge, and the rotation axis of the second fixed pulley overlaps with the rotation axis of the first fixed pulley. The bridge railing safety lifting device for going up and down the bridge also includes an anti-detachment component, which includes: Anti-detachment hooks are installed on the mounting frame; The anti-detachment device, one end of which engages with the anti-detachment hook; and The second lifting rope has one end connected to the other end of the anti-detachment device, and the other end of the second lifting rope passes around the second fixed pulley and is connected to the railing.

7. The bridge railing safety lifting device for going up and down the bridge as described in claim 1, characterized in that, The bottom of the first lifting rope is provided with a connecting hook, which is attached to the railing.

8. The bridge railing safety lifting device for going up and down the bridge as described in claim 1, characterized in that, The winch drive is a hand-cranked winch.

9. The bridge railing safety lifting device for going up and down the bridge as described in claim 1, characterized in that, The first lifting rope moves in a direction perpendicular to the length of the bridge.

10. The bridge railing safety lifting device for going up and down the bridge as described in claim 6, characterized in that, The bottom end of the second lifting rope is flush with the bottom end of the first lifting rope so that the railing can be raised and lowered horizontally.

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