Sliding type safety device on bailey truss and using method of sliding type safety device

Abstract

The invention discloses a sliding type safety device on a bailey truss and a using method of the sliding type safety device, and relates to the technical field of steel structure installing.The safety device comprises a sliding block body, fastening units, sliding wheels and stand columns, and the sliding block body is arranged above an upper chord of the bailey truss in a striding mode; the sliding wheels are in rolling fit with the appearance of the upper chord so as to slide along the length direction of the upper chord; the fastening unit is used for pressing and clamping the sliding block body and a lower side base plate arranged on the bottom side of the upper chord member so as to limit and fasten the position of the sliding block body; the stand column is connected to the upper portion of the sliding block body and used for forming a safety life rope tying point and / or a safety belt hanging point. The safety device can enable a safety belt hanging point to continuously move along with the operation position of a constructor, so that the requirements of high hanging and low use are met, the short-time failure risk caused by repeated hanging releasing and re-hanging is reduced, and the safety and the operation efficiency in the construction process of the bailey truss are improved; the technical problem that an existing bailey truss lacks a safety belt hanging structure capable of continuously moving along with the operation position is solved.

Description

Technical Field

[0001] This invention relates to the field of steel structure installation technology, and in particular to a sliding safety device on a Bailey bridge and its usage method. Background Technology

[0002] Bailey bridges, as a standardized prefabricated steel structure component, are widely used in engineering fields such as steel platforms, steel trestle bridges, temporary passages, and bridge construction due to their high load-bearing capacity, high assembly efficiency, and good adaptability. During the installation, adjustment, and dismantling of Bailey bridges, construction workers often need to work at heights or near edges, which poses a high risk. Fall protection is a key control point in construction safety management.

[0003] According to current laws and regulations on work safety and construction safety technical specifications, workers at heights must wear safety belts and adhere to the basic principle of "high attachment, low use," meaning the safety belt should be attached higher than the worker's work point to effectively shorten the fall distance and reduce impact in the event of a fall. However, at Bailey bridge construction sites, because the structures are often temporary and the construction phases are constantly changing, reliable and continuous safety belt attachment points are difficult to maintain indefinitely.

[0004] In current construction practices, one method involves pre-setting safety belt attachment points on the shore or temporary operating platform. While this method meets the requirement of high attachment and low use, it is limited by the length of the safety rope, restricting the range of movement for construction workers. Frequent adjustments to the attachment position are necessary during work shifts, impacting construction efficiency. Another common method involves workers directly attaching the safety belts with double hooks to the Bailey bridge structure. As workers move or change their work position, the safety hooks need to be constantly unattached and reattached, which is particularly cumbersome when walking on the lower chord of the Bailey bridge or between two Bailey bridge sections, posing a safety hazard of temporary loss of reliable protection.

[0005] In addition, the existing Bailey bridge structure itself does not have dedicated sliding anchor points or lifeline support structures for personnel safety protection. Existing safety protection measures mostly rely on temporary arrangements or manual operation, which makes it difficult to balance safety, continuity and construction convenience, and is also not conducive to unified protection management under the condition of multiple people working together.

[0006] In summary, the existing technology has at least the following technical problems: The existing Bailey bridge lacks a safety belt mounting structure that can be continuously moved with the work position, which makes it difficult to achieve continuous high-hanging and low-use, poses a risk of short-term loss of protection, and is not conducive to improving the overall construction safety and work efficiency. Summary of the Invention

[0007] The purpose of this invention is to provide a sliding safety device on a Bailey bridge and its usage method, in order to solve the technical problems of existing Bailey bridges lacking a safety belt hanging structure that can move continuously with the work position, making it difficult to achieve continuous high hanging and low use, posing a risk of short-term failure, and being detrimental to improving overall construction safety and work efficiency.

[0008] The preferred technical solutions among the many technical solutions provided by this invention can produce a variety of technical effects, which are described in detail below.

[0009] To address the aforementioned technical problems, the present invention provides the following technical solution: This invention provides a sliding safety device for a Bailey bridge and its usage method, comprising a sliding block, a fastening unit, sliding wheels, and a column; the sliding block is positioned above the upper chord of the Bailey bridge and slides along the length of the upper chord; the sliding wheels are installed at both longitudinal ends on the upper side of the sliding block and are used to roll and engage with the upper part of the upper chord of the Bailey bridge to achieve the sliding movement of the sliding block; the fastening unit is used to press and clamp the sliding block against a lower pad located on the bottom side of the upper chord to limit and secure the position of the sliding block on the upper chord; the column is connected above the sliding block and is used to form a safety rope attachment point and / or a safety belt attachment point.

[0010] In one embodiment, the sliding block is a cuboid structure with a cavity from its longitudinal center to its lower side, the cavity being used to provide a through channel for the fastening bolts of the fastening unit.

[0011] In one embodiment, the fastening unit includes a fastening bolt, an upper fastening nut, a lower fastening nut, an upper washer, a lower washer, and a lower side pad; the fastening bolt passes through the sliding block from top to bottom and through the middle hollow area of ​​the upper chord and through the lower side pad; the upper fastening nut and the lower fastening nut are respectively threaded to the fastening bolt to press and clamp the upper chord between the sliding block and the lower side pad.

[0012] In one embodiment, a bearing is provided in the middle of the sliding wheel, the bearing is engaged with the wheel axle hole of the sliding block, and the sliding wheel is sleeved on the outside of the bearing.

[0013] In one embodiment, the sliding block has slots on both sides opposite to the bearing; a limiting slide and a damping spring are stacked in sequence in the slots, the limiting slide abuts against the end face of the bearing to limit the axial movement of the sliding wheel, and the damping spring applies an elastic preload to the limiting slide to absorb the impact vibration during the rolling process. The slots are used to accommodate and guide the limiting slide and the damping spring.

[0014] In one embodiment, at least one seat belt attachment point structure is provided on the upper side of the sliding block. The seat belt attachment point structure is a semi-circular safety ring provided on the upper side of the sliding block for the seat belt hook to be attached.

[0015] In one embodiment, mounting holes are provided on both sides of the sliding block, and a fastening bearing and a compression fastening plate are provided at the mounting holes. The fastening bearing is rotatably mounted in one side of the mounting hole in an eccentric arrangement, and the shaft hole of the compression fastening plate is sleeved on the outer ring of the fastening bearing. The compression fastening plates are arranged in pairs facing each other on the sliding block and rotate around the fastening bearing. In the locked state, the abutting surface of the compression fastening plate abuts against the side of the upper chord of the Bailey bridge to form a locking clamp, so as to achieve the anti-dislodgement and anti-slipping limitation of the sliding block together with the upper and lower clamping of the fastening unit.

[0016] A method for using a sliding safety device on a Bailey bridge is also provided. The method includes the following steps: S1, Deployment: The safety device is placed across the upper chord of the Bailey bridge and slid along the upper chord to the target work area. S2. Fastening: The fastening unit presses the sliding block against the lower pad to clamp the upper chord, and rotates the two side compression fastening plates to make the two side compression fastening plates press against the sides of the upper chord to form a tight clamp. S3. Hanging: Hang the construction workers' safety belt hooks on the safety ring and / or the safety belt hanging point, and / or tie the safety lifeline to the safety lifeline tying point on the column to form a temporary hanging point that meets the requirements of high hanging and low use; S4. Follow-up operation: During the operation, the construction personnel can release the clamping grip on the side of the upper chord by moving the clamping plates on both sides, and then push or pull the safety device along the upper chord to move with the operation position to achieve continuous hanging protection.

[0017] The beneficial effects of this invention are as follows: (1) Achieve continuous follow-up of seat belt attachment points By placing a sliding block across the upper chord of the Bailey bridge and utilizing the sliding wheels on the sliding block to roll in coordination with the shape of the upper chord, the safety device can slide smoothly along the length of the Bailey bridge. This allows the safety belt attachment point to move continuously with the work position of the construction personnel, avoiding the problem of limited range of motion caused by fixed attachment points in existing technologies.

[0018] (2) Effectively meet the safety requirements of high mounting and low use. By setting up columns above the sliding block to form safety rope attachment points and / or safety belt attachment points, the safety belt is always hung higher than the work point of the construction workers. This structurally ensures the principle of using safety belts with a high attachment point and a low usage point, thus improving the safety and reliability of high-altitude operations.

[0019] (3) Reduce the risk of short-term failure caused by repeated unhooking and rehooking. Compared to existing technologies that require construction workers to repeatedly unhook and rehook the safety belts point by point, the sliding safety device in this technical solution can move while keeping the safety belt continuously in a hooked state, avoiding the short-term unprotected state that occurs during unhooking and rehooking, and significantly reducing the risk of falls.

[0020] (4) Balancing the needs for stable positioning and mobility to improve construction efficiency. This technical solution uses a fastening unit to clamp the sliding block to the lower side pad on the bottom side of the upper chord. When a fixed working position is required, reliable limiting can be achieved. When follow-up operation is required, the limiting can be released and smooth sliding can be achieved. This achieves a balance between safety and operational flexibility, which is conducive to improving the overall work efficiency of Bailey bridge installation and dismantling.

[0021] (5) It is applicable to a variety of Bailey bridge construction scenarios and has good versatility. This technical solution uses the existing upper chord structure of the Bailey bridge as the installation basis, without the need to modify the Bailey bridge itself. It can be quickly deployed in various construction scenarios such as steel platforms and steel trestle bridges. It can be used by a single person or used as an intermediate support point for multiple people to share as a safety lifeline, and has strong engineering applicability and promotion value. Attached Figure Description

[0022] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is an isometric structural diagram of the sliding safety device on the Bailey bridge of the present invention; Figure 2 This is a schematic diagram of the upper isometric structure of the sliding block assembly of the present invention; Figure 3 This is a lower isometric structural diagram of the sliding block assembly of the present invention; Figure 4 This is a schematic diagram of the assembly structure of the sliding wheel of the present invention; Figure 5 This is a schematic diagram of the assembly structure of the sliding block mounting hole and the fastening bearing of the present invention; Figure 6 This is a schematic diagram of the assembly structure of the slot, bearing, limiting slide and shock-absorbing spring of the present invention; Figure 7 This is a schematic diagram of the structure of the second embodiment of the present invention, which provides a seat belt attachment point structure on the sliding block; Figure 8 This is a schematic diagram of the process steps for using the sliding safety device on the Bailey bridge according to the present invention.

[0024] The accompanying figure is labeled as follows: 1. Sliding block; 11. Cavity; 12. Slot; 13. Mounting hole; 2. Fastening unit; 21. Fastening bolt; 22. Upper fastening nut; 23. Lower fastening nut; 24. Upper washer; 25. Lower washer; 26. Lower side plate; 3. Pulley; 31. Bearing; 32. Limiting slide; 33. Shock-absorbing spring; 4. Post; 41. Safety rope attachment point; 42. Safety belt attachment point; 5. Seat belt attachment point structure; 51. Safety ring; 6. Secure the bearings; 7. Extrusion fastening plate; 71. Pressing surface. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0026] The specific implementation provides a sliding safety device for a Bailey bridge and its usage method. The safety device includes a sliding block, a fastening unit, a sliding wheel, and a column. The sliding block spans above the upper chord of the Bailey bridge and slides along the length of the upper chord via the sliding wheel's rolling engagement with the upper chord's shape. The fastening unit clamps the sliding block against a lower pad located on the bottom side of the upper chord, limiting and securing the sliding block's position. The column connects above the sliding block and forms a safety rope attachment point and / or a safety belt attachment point. This safety device allows the safety belt attachment point to move continuously with the worker's work position, meeting the requirement of high attachment and low use, reducing the risk of short-term loss of protection caused by repeated unhooking and rehooking, and improving safety and work efficiency during Bailey bridge construction. It effectively solves the technical problems of existing Bailey bridges lacking a continuously movable safety belt attachment structure, making continuous high attachment and low use difficult, posing a risk of short-term loss of protection, and hindering the improvement of overall construction safety and work efficiency.

[0027] The first implementation of a sliding safety device on a Bailey bridge, for example Figure 1As shown, the structure includes a sliding block 1, a fastening unit 2, a sliding wheel 3, and a column 4. The sliding block 1 is positioned above the upper chord of the Bailey bridge and slides along the length of the upper chord. The sliding wheel 3 is installed at both longitudinal ends on the upper side of the sliding block 1 and is used to roll and engage with the upper part of the upper chord of the Bailey bridge to achieve the sliding of the sliding block 1. The fastening unit 2 is used to press and clamp the sliding block 1 against the lower pad 26 located on the bottom side of the upper chord to limit and fasten the position of the sliding block 1 on the upper chord. The column 4 is connected above the sliding block 1 and is used to form a safety lifeline attachment point 41 and / or a safety belt attachment point 42.

[0028] Specifically, compared with existing technologies, and addressing the technical problems of existing Bailey bridges lacking a safety belt mounting structure that can continuously move with the work position, making it difficult to achieve continuous high-hanging and low-use, posing a short-term risk of failure, and hindering the improvement of overall construction safety and work efficiency, this technical solution provides a sliding safety device on a Bailey bridge, which has at least the following technical advantages: enabling continuous movement of the safety belt mounting point 42; by placing the sliding block 1 across the upper chord of the Bailey bridge, and utilizing the sliding wheel 3 set on the sliding block 1 to roll in cooperation with the shape of the upper chord, the safety device can smoothly slide along the length of the Bailey bridge, thereby allowing the safety belt mounting point 42 to continuously move with the work position of the construction personnel, avoiding the problem of limited range of motion caused by fixed mounting points in existing technologies.

[0029] It effectively meets the safety requirements of high hanging and low use; by setting up a column 4 above the sliding block 1 to form a safety life rope tethering point 41 and / or a safety belt hanging point 42, the hanging height of the safety belt is always higher than the working point of the construction personnel, which structurally ensures the principle of high hanging and low use of the safety belt and improves the safety and reliability of high-altitude operations.

[0030] This technology reduces the risk of short-term loss of protection caused by repeated unhooking and rehooking. Compared with the existing technology that requires construction workers to repeatedly unhook and rehook the double hooks of the safety belt point by point, the sliding safety device of this technology can move with the safety belt while keeping it continuously in the hanging state, avoiding the short-term unprotected state during unhooking and rehooking, and significantly reducing the risk of falling.

[0031] Balancing the needs for stable positioning and mobility, this technical solution improves construction efficiency. By using fastening unit 2 to clamp the sliding block 1 and the lower pad 26 on the bottom side of the upper chord, reliable positioning can be achieved when a fixed working position is required, and smooth sliding can be achieved when a moving operation is required. This balances safety and operational flexibility, which helps to improve the overall work efficiency of Bailey bridge installation and dismantling.

[0032] This solution is applicable to various Bailey bridge construction scenarios and has good versatility. Based on the existing upper chord structure of the Bailey bridge, it does not require modification of the Bailey bridge itself and can be quickly deployed in various construction scenarios such as steel platforms and steel trestle bridges. It can be used by a single person or as an intermediate support point for multiple people to share as a safety lifeline, and has strong engineering applicability and promotion value.

[0033] As one alternative implementation method: Regarding the specific structure of the aforementioned sliding block 1, this embodiment is as follows: Figure 1 As shown, the sliding block 1 is a cuboid structure with a cavity 11 from its longitudinal center to its lower side. The cavity 11 is used to provide a through channel for the fastening bolt 21 of the fastening unit 2.

[0034] In application, by designing the sliding block 1 as a cuboid structure with a cavity 11 extending from its longitudinal center to its lower side, the fastening bolt 21 in the fastening unit 2 can penetrate the sliding block 1 from top to bottom and form an axially symmetrical clamping force path with the upper chord of the Bailey bridge. On the one hand, the cavity 11 structure provides a stable and restricted installation channel for the fastening bolt 21, preventing the fastening bolt 21 from deflecting or bending during the force application process; on the other hand, it makes the force on the sliding block 1 more uniform on the upper chord, which is beneficial for working in conjunction with the sliding wheel 3 and the lateral clamping structure. While ensuring smooth sliding, it also improves the stability of the overall structure, thereby solving the problems of concentrated force and insufficient stability of existing temporary safety anchors.

[0035] The cross-sectional shape of the cavity 11 is set as a rectangular structure to accommodate fastening bolts 21 of different specifications; the inner wall of the cavity 11 can also be provided with anti-loosening ribs or coated with anti-wear coating to further improve durability and vibration resistance.

[0036] Regarding the locking structure of the fastening unit 2 on the lower side of the upper chord, this implementation is, for example... Figures 1 to 3 As shown, the fastening unit 2 includes a fastening bolt 21, an upper fastening nut 22, a lower fastening nut 23, an upper washer 24, a lower washer 25, and a lower side pad 26. The fastening bolt 21 passes through the sliding block 1 from top to bottom and through the middle hollow area of ​​the upper chord and through the lower side pad 26. The upper fastening nut 22 and the lower fastening nut 23 are respectively threaded to the fastening bolt 21 to press and clamp the upper chord between the sliding block 1 and the lower side pad 26.

[0037] In application, the sliding block 1 and the upper chord form a locking structure by the cooperation of the fastening bolt 21, the upper fastening nut 22, the lower fastening nut 23, the upper and lower washers 25, and the lower side pad 26, thus clamping the upper chord with the lower chord. When this structure is in operation, tightening the upper and lower fastening nuts 23 applies an upward supporting force to the bottom of the upper chord by the lower side pad 26, while simultaneously applying a downward pressing force to the upper side of the upper chord by the sliding block 1, thereby achieving reliable fixation without damaging the original structure of the Bailey bridge. This vertical clamping method, in conjunction with the lateral clamping structure, allows for flexible switching between sliding and locked states, solving the technical problem of existing safety devices struggling to balance mobility and stability.

[0038] The lower pad 26 is designed with anti-slip texture to accommodate the upper chord section of different Bailey bridge models; the fastening nuts are anti-loosening nuts, double nuts, or with limit pins to enhance vibration resistance and anti-loosening performance.

[0039] Regarding the specific structure of the aforementioned sliding wheel 3, this embodiment is as follows: Figures 1 to 4 and Figure 6 As shown, a bearing 31 is provided in the middle of the sliding wheel 3. The bearing 31 is engaged with the wheel axle hole of the sliding block 1, and the sliding wheel 3 is sleeved on the outside of the bearing 31.

[0040] The sliding block 1 has slots 12 on both sides opposite to the bearing 31. Limiting slides 32 and damping springs 33 are stacked in sequence in the slots 12. The limiting slides 32 abut against the end face of the bearing 31 to limit the axial movement of the sliding wheel 3. The damping springs 33 apply elastic preload to the limiting slides 32 to absorb the impact vibration during the rolling process. The slots 12 are used to accommodate and guide the limiting slides 32 and the damping springs 33.

[0041] In application, the sliding wheel 3 is mounted on both ends of the sliding block 1 via bearings 31, allowing the sliding block 1 to roll smoothly along the upper chord, thereby reducing manual pushing resistance and minimizing direct metal-to-metal friction. By providing slots 12 on both sides of the bearings 31, and sequentially installing limiting slide plates 32 and damping springs 33 within the slots 12, the axial movement of the sliding wheel 3 is effectively limited when subjected to vertical loads and lateral disturbances. Simultaneously, the damping springs 33 absorb impact vibrations during rolling. This structure, in conjunction with the sliding block 1 and the fastening unit 2, ensures that the safety device has both smooth sliding capability and maintains structural stability during follow-up operations, preventing instability of the safety belt attachment point 42 due to shaking or impact.

[0042] The sliding wheel 3 adopts a composite wheel structure with a wear-resistant rubber layer or a polyurethane layer to reduce operating noise; the bearing 31 is selected as a sealed bearing 31 or a self-lubricating bearing 31 to adapt to complex construction environments such as dust and rain.

[0043] Regarding the side clamping structure of the fastening unit 2 for the upper chord, this implementation is, for example... Figures 1 to 3 , Figure 5 and Figure 7 As shown, mounting holes 13 are provided on both sides of the sliding block 1. A fastening bearing 6 and a compression fastening plate 7 are installed at the mounting holes 13. The fastening bearing 6 is rotatably installed in one side of the mounting hole 13 in an eccentric arrangement. The shaft hole of the compression fastening plate 7 is sleeved on the outer ring of the fastening bearing 6. The compression fastening plates 7 are arranged in pairs facing each other on the sliding block 1 and rotate around the fastening bearing 6. In the locked state, the pressing surface 71 of the compression fastening plate 7 abuts against the side of the upper chord of the Bailey bridge to form a locking clamp, so as to achieve the anti-falling and anti-slip limiting of the sliding block 1 together with the upper and lower pressing clamp of the fastening unit 2.

[0044] In application, by setting compression fastening plates 7 on both sides of the sliding block 1, which can rotate around the fastening bearing 6, the pressing surface 71 of the compression fastening plates 7 forms a locking clamp with the side of the upper chord in the locked state. This further restricts the lateral displacement and accidental slippage of the sliding block 1 on the basis of the upper and lower clamping structure. This lateral clamping structure can be released when follow-up operation is required and quickly locked when the operation position needs to be fixed. It works in conjunction with the fastening unit 2 and the sliding wheel 3 to achieve a dual working mode of "movable-lockable", improving the overall construction safety and operational flexibility.

[0045] The compression fastening plate 7 adopts an eccentric wheel-type toothed surface friction structure, which makes the abutting surface 71 equipped with anti-slip teeth and a high friction coefficient coating to improve clamping reliability.

[0046] A second implementation of the sliding safety device on the Bailey bridge, for example Figure 7 As shown, the difference between this embodiment and the first embodiment is that, regarding the seat belt attachment structure 5 provided on the sliding block 1, at least one seat belt attachment structure 5 is provided on the upper side of the sliding block 1. The seat belt attachment structure 5 is a semi-circular safety ring 51 provided on the upper side of the sliding block 1 for the seat belt hook to be attached.

[0047] In application, a semi-circular safety ring 51 is installed on the upper side of the sliding block 1, allowing construction workers to directly attach the safety belt hook to this ring 51. This ensures the safety belt remains continuously attached as the sliding block 1 moves with the upper chord. The safety ring 51 and the column 4 structure form a height difference, ensuring the safety belt is always attached higher than the worker's work point, meeting the safety requirement of "high attachment, low use." Furthermore, it works in conjunction with the following function of the sliding wheel 3 to prevent workers from frequently unhooking and reattaching their safety belts during movement, significantly reducing the risk of short-term loss of protection.

[0048] The safety ring 51 is configured as a detachable or flip-up structure, and is bolted to the sliding block 1, or multiple safety rings 51 are set on the sliding block 1 to accommodate the double hook safety belt.

[0049] Based on the above embodiments of the sliding safety device on a Bailey bridge, a method for using the sliding safety device on a Bailey bridge is provided, for example... Figure 8 As shown, the steps S1 to S4 are implemented sequentially: S1, Deployment: The safety device is placed across the upper chord of the Bailey bridge and slid along the upper chord to the target work area; S2. Fastening: The fastening unit presses the sliding block against the lower pad to clamp the upper chord, and rotates the two side compression fastening plates to make the two side compression fastening plates press against the sides of the upper chord to form a tight clamp. S3. Hanging: Hang the construction workers' safety belt hooks on the safety ring and / or the safety belt hanging point, and / or tie the safety lifeline to the safety lifeline tying point on the column to form a temporary hanging point that meets the requirements of high hanging and low use; S4. Follow-up operation: During the operation, the construction personnel can release the clamping grip on the side of the upper chord by moving the clamping plates on both sides, and then push or pull the safety device along the upper chord to move with the operation position to achieve continuous hanging protection.

[0050] By deploying, securing, attaching, and following up on the sliding safety device on the Bailey bridge according to steps S1 to S4, the safety belt attachment point can be continuously moved with the work position during the construction of the Bailey bridge.

[0051] In the specific implementation process, the safety device is first installed above the upper chord of the Bailey bridge and slid to the target work area. The fastening unit is used to make the sliding block and the lower pad clamp the upper chord from both sides. Then, the sides of the upper chord are clamped by the compression fastening plates, thus forming a reliable limit when the work point needs to be fixed. Subsequently, the construction personnel hang the safety belt hook on the safety ring on the sliding block and / or the safety belt hanging point or safety lifeline tie point formed by the column, so that the safety belt hanging height is always higher than the work point of the workers, which meets the safety requirement of high hanging and low use.

[0052] When construction workers move along the Bailey bridge, the locking clamp formed by the compression fastening plate on the side of the upper chord is released. The sliding block moves smoothly along the upper chord under the rolling cooperation of the sliding wheel and the upper chord, allowing the safety belt attachment point to move synchronously with the workers. This avoids the need for workers to repeatedly unhook and rehook their safety belts while walking. This method, through the synergistic effect of the fastening unit, sliding wheel, compression fastening plate, and safety belt attachment point structure, ensures both the mobility of the device and the necessary limiting stability. It effectively reduces the risk of short-term safety failure caused by fixed attachment points or frequent unhooking in existing technologies, and improves the overall construction safety and work efficiency during the installation and dismantling of Bailey bridges.

[0053] In the above-described usage method, the safety device can be set to a single-person independent use mode or used as an intermediate support point for multiple people to share as a safety lifeline, depending on the needs of the operation during movement.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described.

Claims

1. A sliding safety device on a Bailey bridge, characterized in that, Includes sliding block, fastening unit, pulley and column; The sliding block is positioned above the upper chord of the Bailey bridge and slides along the length of the upper chord; the sliding wheels are installed at both longitudinal ends on the upper side of the sliding block and are used to roll and engage with the upper part of the upper chord of the Bailey bridge to realize the sliding of the sliding block; The fastening unit is used to press and clamp the sliding block with the lower pad plate provided on the bottom side of the upper chord, so as to limit and fasten the position of the sliding block on the upper chord; The column is connected above the sliding block to form a safety rope attachment point and / or a safety belt attachment point.

2. The sliding safety device on the Bailey bridge according to claim 1, characterized in that, The sliding block is a cuboid structure with a cavity from its longitudinal center to its lower side, and the cavity is used to provide a through channel for the fastening bolts of the fastening unit.

3. The sliding safety device on the Bailey bridge according to claim 1, characterized in that, The fastening unit includes a fastening bolt, an upper fastening nut, a lower fastening nut, an upper washer, a lower washer, and a lower side pad. The fastening bolt passes through the sliding block from top to bottom and through the middle hollow area of ​​the upper chord and through the lower side pad. The upper fastening nut and the lower fastening nut are respectively threaded to the fastening bolt to press and clamp the upper chord between the sliding block and the lower side pad.

4. The sliding safety device on the Bailey bridge according to claim 1, characterized in that, The sliding wheel is provided with a bearing in the middle, the bearing is engaged with the wheel axle hole of the sliding block, and the sliding wheel is sleeved on the outside of the bearing.

5. The sliding safety device on the Bailey bridge according to claim 4, characterized in that, The sliding block has slots on both sides opposite to the bearing; A limiting slide and a damping spring are stacked sequentially in the slot. The limiting slide abuts against the end face of the bearing to limit the axial movement of the sliding wheel. The damping spring applies an elastic preload to the limiting slide to absorb the impact vibration during the rolling process. The slot is used to accommodate and guide the limiting slide and the damping spring.

6. The sliding safety device on the Bailey bridge according to claim 1, characterized in that, At least one safety belt attachment point structure is provided on the upper side of the sliding block. The safety belt attachment point structure is a semi-circular safety ring provided on the upper side of the sliding block for the safety belt hook to be attached.

7. The sliding safety device on the Bailey bridge according to claim 6, characterized in that, The sliding block is provided with mounting holes on both sides, and fastening bearings and compression fastening plates are provided at the mounting holes; The fastening bearing is rotatably mounted in the mounting hole on one side in an eccentric arrangement, and the shaft hole of the compression fastening plate is sleeved outside the outer ring of the fastening bearing; The compression fastening plates are arranged in pairs facing each other on the sliding block and rotate around the fastening bearing. In the locked state, the pressing surface of the compression fastening plate abuts against the side of the upper chord of the Bailey frame to form a locking clamp, so as to achieve the anti-dislodgement and anti-slipping limit of the sliding block together with the upper and lower pressing clamp of the fastening unit.

8. A method of using a sliding safety device on a Bailey bridge, for use with the sliding safety device on a Bailey bridge as described in claim 7, characterized in that, The steps include: S1, Deployment: The safety device is placed across the upper chord of the Bailey bridge and slid along the upper chord to the target work area; S2. Fastening: The fastening unit presses the sliding block against the lower pad to clamp the upper chord, and rotates the two side compression fastening plates to make the two side compression fastening plates press against the sides of the upper chord to form a tight clamp. S3. Hanging: Hang the construction workers' safety belt hooks on the safety ring and / or the safety belt hanging point, and / or tie the safety lifeline to the safety lifeline tying point on the column to form a temporary hanging point that meets the requirements of high hanging and low use; S4. Follow-up operation: During the operation, the construction personnel can release the clamping grip on the side of the upper chord by moving the clamping plates on both sides, and then push or pull the safety device along the upper chord to move with the operation position to achieve continuous hanging protection.

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