Multi-stage self-emergency protection cable for preventing beam falling

Abstract

A kind of anti-falling beam multistage self-emergency protection cable. Multiple processing methods are lacking in bridge related anti-falling beam processing. In the utility model, the top side of the steel sleeve is fixedly connected to the bottom surface of the box girder body through the connecting cushion block, the support is vertically arranged on the outer side wall of the pier, the built-in wire assembly is arranged in the connecting pipe, the first metal rubber block is fixedly connected to the outer wall of one end of the steel sleeve, the outer side of the second metal rubber block is fixedly connected to the inner wall of the other end of the steel sleeve, one end of the connecting pipe is connected to the support, the other end of the connecting pipe is sequentially connected to the first limiting head after passing through the steel sleeve, the first metal rubber block and the second metal rubber block, the middle limiting steel ring is fixedly sleeved on the connecting pipe, when the steel sleeve moves away from the pier with the box girder body, the middle limiting steel ring is tightly attached to the first metal rubber block, when the steel sleeve moves away from the pier again with the box girder body, the second metal rubber block is tightly attached to the first limiting head.

Description

Technical Field

[0001] This utility model specifically relates to a multi-stage self-emergency protection cable for preventing beam falls, belonging to the field of road and bridge technology. Background Technology

[0002] The problem of beams falling off a bridge can cause the superstructure to detach from the substructure, resulting in traffic disruption and severely impacting road capacity. During natural disasters such as earthquakes, fallen beams can obstruct rescue vehicle access, delaying rescue efforts and increasing the difficulty of rescue operations. Furthermore, fallen beams can damage the bridge structure. During a fall, the beams exert tremendous impact and collision forces on the piers, causing damage to the piers, abutments, and other substructures, potentially leading to the collapse of the entire bridge. In addition, repairs after a beam fall are extremely difficult; earthquake damage from fallen beams is often difficult to treat and reuse, resulting in very high costs and long repair times. Falling beams can also trigger other structural damage. They may break piers, damage the substructure, or even cause the entire bridge to collapse, leading to a chain reaction of damage to surrounding buildings and facilities. After a beam falls, the bridge structure is in an unstable state, posing a serious threat to pedestrians and vehicles.

[0003] The main reasons for bridge beam collapse are as follows:

[0004] First: Slope instability: When an earthquake or other natural disaster causes slope instability, it may cause the bridge abutments and bridge to slide towards the center of the river. When this sliding is too large, the bridge piers may break, causing the adjacent spans to fall, resulting in a collapsed bridge.

[0005] Second: Bearing failure: Bridge bearings are crucial components connecting the superstructure and substructure. During an earthquake, the seismic forces from the superstructure are transmitted to the substructure through the bearings. If the transmitted load exceeds the design strength of the bearings, they will be damaged or fail. Damaged bearings will cause displacement between the pier and the beam. When this relative displacement exceeds the support length of the main beam, the main beam will detach from the pier, resulting in a beam collapse.

[0006] Third: Excessive vibration: Under the influence of a strong earthquake, bridges may experience longitudinal vibration, and there may also be relative vibration between the piers. When the vibration is too great, the bridge supports are often damaged, and the superstructure may be pulled away from the piers, leading to the collapse of the bridge beams.

[0007] Fourth: Foundation and subgrade damage: Severe damage to the foundation and subgrade is also a major cause of bridge collapse and beam fall. Foundation damage mainly refers to horizontal slippage, subsidence, and fracturing of strata caused by factors such as soil liquefaction, uneven settlement, and insufficient stability under earthquake action. This damage directly affects the stability of the bridge foundation, which may lead to overall bridge displacement, tilting, and subsidence, and in severe cases, beam fall.

[0008] Fifth: Failure of the restraint structure: If the restraint structure of the bridge is not designed properly or fails, then under the action of seismic force, there may be a large relative displacement between the beam and the pier, which may lead to the beam falling off.

[0009] Existing chain-type anti-fall beam devices mainly rely on empirical coefficients for parameter design and response rigidity, lacking buffer mechanisms. Currently, there is a lack of durable and fast-responding anti-fall beam measures, as well as standardized handling methods after anti-fall beams are not available. Utility Model Content

[0010] To overcome the shortcomings of existing technologies, a multi-stage self-emergency protective cable for preventing beam falls is provided to solve the above problems.

[0011] A multi-stage self-emergency protective cable for preventing beam falls includes a connecting pad, a steel sleeve, a connecting pipe, an internal stranded wire assembly, a first limiting head, a support, a central limiting steel ring, a first metal rubber block, and a second metal rubber block. The steel sleeve is horizontally positioned, with its top side fixedly connected to the bottom surface of the box girder via the connecting pad. The support is vertically positioned on the outer wall of the pier. The internal stranded wire assembly passes through the connecting pipe. The first metal rubber block is fixedly connected to the outer wall of one end of the steel sleeve, and the outer side of the second metal rubber block is fixedly connected to the inner wall of the other end of the steel sleeve. One end of the connecting pipe is connected to the support, and the other end of the connecting pipe passes sequentially through the steel sleeve, the first metal rubber block, and the second metal rubber block before connecting to the first limiting head. The connecting pipe is fixed with... The fixed set is equipped with a central limiting steel ring, which is positioned between the first and second metal rubber blocks. When the multi-stage self-emergency protection cable of the anti-fall beam is in the first-level protection state, the steel sleeve moves horizontally away from the pier along with the box girder, and the central limiting steel ring is in close contact with the first metal rubber block. When the multi-stage self-emergency protection cable of the anti-fall beam is in the second-level protection state, the steel sleeve moves horizontally away from the pier along with the box girder, and the second metal rubber block is in close contact with the first limiting head, and the built-in stranded wire assembly is in the main tension state of the anti-fall beam. The built-in stranded wire assembly includes at least three bundles of steel strands, which are arranged in parallel inside the connecting pipe and are evenly distributed along the circumference of the connecting pipe.

[0012] As a preferred embodiment: when the steel sleeve is a top-open cylindrical body, the top-open cylindrical body includes an outer shell and two first end plates. The outer shell is set on the bottom surface of the connecting pad along the length direction of the connecting pad. The longitudinal cross-sectional shape of the outer shell along its width direction is U-shaped. The two first end plates are respectively set at both ends of the outer shell. An inner cavity is formed between the inner wall of the outer shell and the bottom surface of the connecting pad. Each first end plate is machined with a first through hole along its thickness direction. Each first through hole is connected to the inner cavity. The two first through holes are respectively matched with the first metal rubber block and the second metal rubber block. The central limiting steel ring is set along the radial direction of the top-open cylindrical body. The top of the central limiting steel ring is connected to the connecting pad. The central limiting steel ring is spaced apart from the inner wall of the inner cavity.

[0013] As a preferred embodiment: when the steel sleeve is a circumferentially sealed cylinder, the circumferentially sealed cylinder includes a steel cylinder body and two second end plates. The steel cylinder body is set on the bottom surface of the connecting pad along the length direction of the connecting pad. The two second end plates are respectively set at both ends of the steel cylinder body. Each second end plate is machined with a second through hole along its thickness direction. The two second through holes are respectively matched with the first metal rubber block and the second metal rubber block. The central limiting steel ring is set along the radial direction of the top side open cylinder. The outer circumferential edge of the central limiting steel ring is spaced from the inner wall of the steel cylinder body.

[0014] As a preferred option, a gap is provided between the inner wall of the connecting pipe and the outer wall of each bundle of steel strands, and a gap is provided between two adjacent steel strands.

[0015] As a preferred embodiment: the support is a composite support body, which includes a base plate, multiple support rods, an intermediate connecting plate, a through plate, and a second limiting head. One side of the base plate is connected to the outer wall of the pier, and the other side of the base plate is connected to one side of the intermediate connecting plate through multiple support rods. The other side of the intermediate connecting plate is connected to one end of the through plate, and the other end of the through plate is connected to one side of the second limiting head. The end of the connecting pipe is attached to the other side of the second limiting head. The end of each bundle of steel strands near the second limiting head passes through the second limiting head and the through plate and is fixedly connected to the intermediate connecting plate.

[0016] As a preferred embodiment: the connecting pipe is connected to the support via a columnar anchor rod, the columnar anchor rod comprising a connecting column and two anchor rods, an annular protrusion fixedly fitted on the outer wall of the connecting column, one side of the connecting column being fixedly connected to the connecting pipe and the built-in stranded wire assembly respectively, and two anchor rods arranged side by side on the other side of the connecting column, the support being provided with a connecting shaft and two lugs, the two lugs being fixedly connected to one side of the support, the connecting shaft passing between the two lugs, the two ends of the connecting shaft being hinged to the two lugs respectively, each anchor rod having a connecting hole machined at the end near the connecting shaft, each anchor rod being connected to the connecting shaft through the connecting hole, and each anchor rod reciprocating and swinging along the circumferential direction of the connecting shaft.

[0017] As a preferred embodiment, it also includes a third metal rubber block, which is fitted onto the connecting pipe. The third metal rubber block is positioned between the first and second metal rubber blocks, close to the first metal rubber block. One side of the third metal rubber block is fixedly connected to the inner wall of one end of the steel sleeve, and the other side of the third metal rubber block faces the central limiting steel ring.

[0018] The beneficial effects of this utility model are as follows:

[0019] This utility model is an emergency component adapted to activate in critical situations between the bridge beam and pier to prevent beam collapse. It enhances the bridge's proactive defense capabilities, delays and reduces the rapid evolution of structural collapse before or during a bridge collapse, and facilitates the durable and reliable use of the bridge and rescue efforts. The component works in conjunction with connecting pads, steel sleeves, connecting pipes, built-in stranded wire assemblies, a first limiting head, a support, a central limiting steel ring, a first metal rubber block, and a second metal rubber block to form a multi-level emergency protection response to the box girder falling off, providing a dual-level protection effect of buffering and constraint for the box girder. When the multi-stage self-emergency protection cable of the anti-fall beam is in the first-level protection state, when the steel sleeve moves horizontally away from the pier along with the box girder, the central limiting steel ring is in close contact with the first metal rubber block; when the multi-stage self-emergency protection cable of the anti-fall beam is in the second-level protection state, when the steel sleeve box girder moves horizontally away from the pier, the second metal rubber block is in close contact with the first limiting head, and the built-in stranded wire assembly is in the anti-fall beam dominant tension state. Attached Figure Description

[0020] Figure 1 This is a top view of the multi-stage self-emergency protection cable for preventing beam fall in this utility model. In the figure, multiple bundles of steel strands are evenly arranged along the circumference of the first limiting head.

[0021] Figure 2 This is a schematic diagram showing the usage status of the multi-level self-emergency protection cable for preventing beam collapse in this utility model;

[0022] Figure 3 A front view schematic diagram of the connection relationship between the connecting pipe and the central limiting steel ring;

[0023] Figure 4 A side view schematic diagram of the connection relationship between the first limiting head and multiple bundles of steel strands;

[0024] Figure 5 This is a side view of the first metal-rubber block.

[0025] Figure 6 A three-dimensional structural diagram showing the connection between the steel sleeve and the second metal rubber block;

[0026] Figure 7 This is a schematic diagram of the three-dimensional structure of the steel sleeve;

[0027] Figure 8 A side view schematic diagram of a multi-stage self-emergency protection cable structure for an anti-fall beam of another structural form;

[0028] Figure 9 A top-view structural diagram of a multi-stage self-emergency protection cable for a fall-prevention beam, representing another structural form.

[0029] Figure 10 A schematic diagram illustrating the usage status of a multi-stage self-emergency protection cable for a different structural form of anti-fall beam;

[0030] Figure 11 This is a top view of the multi-stage self-emergency protection cable for preventing beam fall in this utility model. The figure shows multiple bundles of steel strands arranged horizontally side by side along the same radial line on the first limit head.

[0031] Figure 12 A side view of the first limiting head in another structural form;

[0032] Figure 13 This is a top view of the structure of the present invention when it includes a third metal rubber block.

[0033] In the diagram: 1-Connecting pad; 2-Steel sleeve; 2-1-Outer shell; 2-2-First end plate; 2-3-Inner cavity; 2-4-First through hole; 2-5-Steel cylinder body; 2-6-Second end plate; 3-Connecting pipe; 4-Built-in stranded wire assembly; 4-1-Steel stranded wire; 5-First limiting head; 6-Columnar anchor rod; 6-1-Connecting column; 6-2-Anchor rod; 6-3-Annular protrusion; 7-Support; 7-1-Bottom plate; 7-2-Support rod; 7-3-Intermediate connecting plate; 7-4-Through plate; 7-5-Second limiting head; 8-Centered limiting steel ring; 11-First metal rubber block; 12-Second metal rubber block; 13-Support lug; 14-Connecting shaft; 15-Connecting hole; 16-Third metal rubber block; 20-Box girder body; 21-Pier; 22-Expansion joint. Detailed Implementation

[0034] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0035] Specific implementation method one: Combining Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 This embodiment describes a multi-stage self-emergency protective cable for preventing beam collapse, comprising a connecting pad 1, a steel sleeve 2, a connecting pipe 3, an internal stranded wire assembly 4, a first limiting head 5, a support 7, a central limiting steel ring 8, a first metal rubber block 11, and a second metal rubber block 12. The steel sleeve 2 is horizontally positioned, and its top side is welded to the bottom surface of the box girder 20 via the connecting pad 1. The support 7 is vertically positioned on the outer wall of the pier 21. The internal stranded wire assembly 4 passes through the connecting pipe 3. The first metal rubber block 11 is fixedly connected to the outer wall of one end of the steel sleeve 2, and the outer side of the second metal rubber block 12 is fixedly connected to the inner wall of the other end of the steel sleeve 2. One end of the connecting pipe 3 is connected to the support 7, and the other end of the connecting pipe 3 passes sequentially through the steel sleeve 2 and the first metal rubber block 11. The second metal rubber block 12 is connected to the first limiting head 5. A central limiting steel ring 8 is fixedly installed on the connecting pipe 3. The central limiting steel ring 8 is set between the first metal rubber block 11 and the second metal rubber block 12. When the multi-stage self-emergency protection cable of the anti-fall beam is in the first-level protection state, when the steel sleeve 2 moves horizontally away from the pier 21 with the box girder 20, the central limiting steel ring 8 is close to the first metal rubber block 11. When the multi-stage self-emergency protection cable of the anti-fall beam is in the second-level protection state, when the steel sleeve 2 moves horizontally away from the pier 21 with the box girder 20, the second metal rubber block 12 is close to the first limiting head 5, indicating that the multi-stage self-emergency protection cable of the anti-fall beam is in the limit position of the second-level protection state, and the built-in stranded wire assembly 4 is in the anti-fall beam dominant tension state.

[0036] In this embodiment, multiple box girders 20 are arranged sequentially to form a beam body. An expansion joint 22 is formed between two adjacent box girders 20. A pier 21 is arranged below the expansion joint 22. The connection process between the box girders 20 and the piers 21 is the same as the connection process between existing box girders and piers.

[0037] In this embodiment, the connecting pad 1 is detachably connected to the bottom surface of the box girder 20 by a plurality of first high-strength bolts, and the support 7 is detachably connected to the outer wall of the pier 21 by a plurality of second high-strength bolts.

[0038] In this embodiment, the multi-level self-emergency protective cable for preventing beam collapse can be adapted to existing bridge reinforcement and new bridge construction projects through pier-beam connection. Regarding seismic load classification, the device maintains normal structural expansion and contraction functions during the E1 earthquake phase and does not participate in seismic activity; during the E2 earthquake phase, it works collaboratively through a dual-level protection mechanism, significantly improving the bridge's seismic safety.

[0039] In this embodiment, when the multi-stage self-emergency protection cable of the anti-fall beam is in the first-level protection state, when the steel sleeve 2 moves horizontally away from the pier 21 along with the box girder 20, the central limiting steel ring 8 is tightly attached to the first metal rubber block 11. That is, the first-level protection is provided by the variable stiffness first metal rubber block 11 to provide a buffer function. Before the displacement reaches the set threshold, the first metal rubber block 11 and the second metal rubber block 12 work together to form two layers of metal rubber buffering effect, effectively suppressing the impact effect of the box girder 20 and limiting its relative displacement. When the displacement of the steel sleeve 2 reaches the set threshold, the second-level protection mechanism is activated. That is, when the multi-stage self-emergency protection cable of the anti-fall beam is in the second-level protection state, when the steel sleeve 2 moves horizontally away from the pier 21 along with the box girder 20, the second metal rubber block 12 is tightly attached to the first limiting head 5, and the built-in strand assembly 4 is in the anti-fall beam dominant tension state and is immediately stressed by the steel strand assembly, providing reliable anti-fall beam constraint. The multi-stage self-emergency protective cable of the anti-fall beam of this utility model is coaxially arranged with the connecting pad 1, steel sleeve 2, connecting pipe 3, built-in stranded wire assembly 4, first limiting head 5, support 7, central limiting steel ring 8, first metal rubber block 11 and second metal rubber block 12. This ensures a clear transmission path of the protective force, avoids eccentric force problems, and ensures that the device can start in time according to the predetermined threshold and play a reliable role under earthquake action.

[0040] This emergency anti-fall beam protection cable is used to achieve the protection process of multi-level buffer anti-fall beam in the 20 unidirectional movement path of the box girder.

[0041] Specific Implementation Method Two: This implementation method is a further limitation of Specific Implementation Method One. In this implementation method, when the steel sleeve 2 is a top-open cylinder, the top-open cylinder includes an outer shell 2-1 and two first end plates 2-2. The outer shell 2-1 is disposed on the bottom surface of the connecting pad 1 along the length direction of the connecting pad 1. The longitudinal cross-sectional shape of the outer shell 2-1 along its width direction is U-shaped. The two first end plates 2-2 are respectively disposed at both ends of the outer shell 2-1. The inner wall of the outer shell 2-1 and the connecting... An inner cavity 2-3 is formed by the bottom surfaces of the pads 1. Each first end plate 2-2 has a first through hole 2-4 machined along its thickness direction. Each first through hole 2-4 is connected to the inner cavity 2-3. The two first through holes 2-4 are respectively matched with the first metal rubber block 11 and the second metal rubber block 12. The central limiting steel ring 8 is set along the radial direction of the top open cylinder. The top of the central limiting steel ring 8 is connected to the connecting pad 1. The central limiting steel ring 8 is separated from the inner wall of the inner cavity 2-3.

[0042] Specific Implementation Method 3: This implementation method is a further limitation of Specific Implementation Method 1 or 2. In this implementation method, when the steel sleeve 2 is a circumferentially sealed cylinder, the circumferentially sealed cylinder includes a steel cylinder body 2-5 and two second end plates 2-6. The steel cylinder body 2-5 is set on the bottom surface of the connecting pad 1 along the length direction of the connecting pad 1. The two second end plates 2-6 are respectively set at both ends of the steel cylinder body 2-5. Each second end plate 2-6 is processed with a second through hole along its thickness direction. The two second through holes are respectively matched with the first metal rubber block 11 and the second metal rubber block 12. The central limiting steel ring 8 is set along the radial direction of the top side open cylinder. The outer circumferential edge of the central limiting steel ring 8 is separated from the inner wall of the steel cylinder body 2-5.

[0043] Specific Implementation Method Four: This implementation method is a further limitation of Specific Implementation Method One, Two or Three. In this implementation method, the first metal rubber block 11 and the second metal rubber block 12 are both cylindrical blocks, which are respectively fitted onto the connecting pipe 3. The outer diameter of the first metal rubber block 11 and the second metal rubber block 12 is larger than the diameter of the first through hole 2-4, and the outer diameter of the first metal rubber block 11 and the second metal rubber block 12 is larger than the second through hole, thereby forming a limiting effect on the extreme positions of the first metal rubber block 11 and the second metal rubber block 12.

[0044] Furthermore, the thickness of the second metal rubber block 12 is less than the thickness of the first metal rubber block 11.

[0045] Specific Implementation Method Five: This implementation method is a further limitation of Specific Implementation Methods One, Two, Three, or Four. In this implementation method, the built-in stranded wire assembly 4 includes at least three bundles of steel strands 4-1, which are arranged side by side inside the connecting pipe 3, combined with... Figure 1As shown, at least three bundles of steel strands 4-1 are evenly distributed in the connecting pipe 3 along the circumferential direction.

[0046] Another structural form is when the steel strand 4-1 is a small-diameter strand, combined with... Figure 11 As shown, at least three bundles of steel strands 4-1 are arranged horizontally side by side along the same radial line of the connecting pipe 3, forming a single radial reinforcement structure along the same radial line, which is beneficial to improving the unidirectional support strength of the anti-fall beam.

[0047] Specific Implementation Method Six: This implementation method is a further limitation of Specific Implementation Method One, Two, Three, Four or Five. In this implementation method, a gap is set between the inner wall of the connecting pipe 3 and the outer wall of each bundle of steel strands 4-1, and a gap is set between two adjacent steel strands 4-1.

[0048] Specific Implementation Method Seven: This implementation method is a further limitation of Specific Implementation Methods One, Two, Three, Four, Five, or Six. In this implementation method, the support 7 is a composite support body. The support 7 includes a base plate 7-1, multiple support rods 7-2, an intermediate connecting plate 7-3, a through plate 7-4, and a second limiting head 7-5. One side of the base plate 7-1 is connected to the outer wall of the pier 21. The other side of the base plate 7-1 is connected to one side of the intermediate connecting plate 7-3 through multiple support rods 7-2. The other side of the intermediate connecting plate 7-3 is connected to one end of the through plate 7-4. The other end of the through plate 7-4 is connected to one side of the second limiting head 7-5. The end of the connecting pipe 3 is attached to the other side of the second limiting head 7-5. The end of each bundle of steel strands 4-1 near the second limiting head 7-5 passes through the second limiting head 7-5 and the through plate 7-4 and is fixedly connected to the intermediate connecting plate 7-3.

[0049] Specific Implementation Method Eight: This implementation method is a further limitation of Specific Implementation Methods One, Two, Three, Four, Five, Six, or Seven. The connecting pipe 3 is connected to the support 7 through the columnar anchor rod 6. The columnar anchor rod 6 includes a connecting column 6-1 and two anchor rods 6-2. An annular protrusion 6-3 is fixedly fitted on the outer wall of the connecting column 6-1. One side of the connecting column 6-1 is fixedly connected to the connecting pipe 3 and the built-in stranded wire assembly 4, respectively. Two anchor rods 6-2 are arranged side by side on the other side of the connecting column 6-1. The support 7 is provided with a connecting shaft 14 and two lugs 13. The two lugs 13 are fixedly connected to one side of the support 7. The connecting shaft 14 passes between the two lugs 13. The two ends of the connecting shaft 14 are respectively hinged to the two lugs 13. Each anchor rod 6-2 has a connecting hole 15 processed at one end near the connecting shaft 14. Each anchor rod 6-2 is connected to the connecting shaft 14 through the connecting hole 15. Each anchor rod 6-2 makes a reciprocating swinging motion along the circumference of the connecting shaft 14.

[0050] In this invention, the material selection process for the multi-stage self-emergency protective cable for anti-falling beams is as follows: The first metal rubber block 11 and the second metal rubber block 12 are both specifically rubber rings. Metal rubber possesses excellent resistance to high and low temperatures, aging, and corrosion, meeting the requirements for long-term field service of the anti-falling beam device. The steel strand 4-1 is a mature standard component, with a maintenance cycle consistent with existing chain-type anti-falling beam devices. The overall cost of the multi-stage self-emergency protective cable for anti-falling beams in this invention is basically the same as that of the chain-type device, but it can provide a dual-stage protection effect combining buffering and restraint for the box girder 20, possessing good engineering applicability and economic efficiency.

[0051] The performance comparison between the multi-stage self-emergency protective cable for the anti-falling beam in this utility model and the existing chain-type anti-falling beam device is as follows:

[0052] First: Existing chain-type anti-fall beam devices are passive responses and lack buffer units, making them prone to significant impact and damage after an earthquake; This device achieves effective buffering through metal rubber pads, reducing the impact force at the beam end and controlling the development of deformation.

[0053] Second: Existing chain-type anti-fall beam devices rely heavily on empirical parameters, and the steel chain has limited load-bearing capacity, posing a risk of insufficient reliability in preventing beam fall. This device combines the actual structural parameters of the bridge to provide a more reliable anti-fall beam safety design. The steel strand load-bearing capacity is designed based on the maximum seismic load, which can prevent beam fall and has both higher reliability and economy.

[0054] The comprehensive comparison between the multi-stage self-emergency protective cable for the anti-falling beam in this utility model and the existing chain-type anti-falling beam device is as follows:

[0055] Specific Implementation Method Nine: This implementation method is a further limitation of Specific Implementation Methods One, Two, Three, Four, Five, Six, Seven, or Eight. In this implementation method, the first limiting head 5 is a disc structure, and the interface structure of the first limiting head 5 is consistent with the arrangement of the multiple bundles of steel strands 4-1 in the built-in stranded wire assembly 4. Figure 4 As shown, when multiple strands of steel wire 4-1 are evenly arranged along the circumferential direction of the first limiting head 5, the first limiting head 5 is processed with multiple circular interfaces along its thickness direction, and the multiple circular interfaces are evenly arranged along the circumferential direction of the first limiting head 5.

[0056] Combination Figure 12 As shown, the alternative structural form of the circular interface is a circular protrusion with two radial notches, that is, each circular protrusion contains two arc strips, the two arc strips are coaxially spaced, the arc strips are elastic arc strips, and the two ends of each arc strip are spaced apart from the two ends of the corresponding other arc strip, forming two notches, which facilitates the stable wrapping connection process after deformation of the end of the steel strand 4-1.

[0057] This emergency anti-fall beam protection cable is used to achieve multi-level buffer anti-fall beam protection in the 20 unidirectional movement path of the box girder. The specific working principle is as follows:

[0058] Installation process: Install the multi-stage self-emergency protection cable of the anti-fall beam between the box girder 20 and the pier 21. Select the corresponding thickness of the connecting pad 1 to ensure that the center axis of the multi-stage self-emergency protection cable in the length direction is matched with the height of the bottom side of the box girder 20. After determining the corresponding thickness of the connecting pad 1, the top side of the steel sleeve 2 is fixedly connected to the bottom surface of the box girder 20 through the corresponding thickness of the connecting pad 1. The support 7 is vertically set on the outer side wall of the pier 21.

[0059] The first emergency protection process: When the multi-level self-emergency protection cable of the anti-fall beam is in the first-level protection state, when the steel sleeve 2 moves horizontally away from the pier 21 along with the box girder 20, the central limiting steel ring 8 is in close contact with the first metal rubber block 11, which indicates that the present invention is in the extreme position of the first-level protection state.

[0060] The second emergency protection process: When the multi-level self-emergency protection cable of the anti-fall beam is in the secondary protection state, when the steel sleeve 2 moves horizontally away from the pier 21 along with the box girder 20, the second metal rubber block 12 is in close contact with the first limit head 5, and the built-in stranded wire assembly 4 is in the main tension state of the anti-fall beam.

[0061] Specific Implementation Method Ten: This implementation method is a further limitation of Specific Implementation Methods One, Two, Three, Four, Five, Six, Seven, Eight, or Nine, combined with... Figure 13 As shown, in this embodiment, the third metal rubber block 16 fitted on the connecting pipe 3 works in conjunction with the central limiting steel ring 8 to achieve a buffering effect. The third metal rubber block 16 is positioned between the second metal rubber block 12 and the first metal rubber block 11. The third metal rubber block 16 is positioned close to the first metal rubber block 11. One side of the third metal rubber block 16 is attached to the inner wall of one end of the steel sleeve 2, and the other side of the third metal rubber block 16 is positioned towards the central limiting steel ring 8.

[0062] In this embodiment, the first metal rubber block 11, the second metal rubber block 12, and the third metal rubber block 16 are all cylindrical. Each of the first metal rubber block 11, the second metal rubber block 12, and the third metal rubber block 16 has a through hole machined in the axial direction to accommodate the connecting pipe 3. The connecting pipe 3 is clearance-fitted with each of the first metal rubber block 11, the second metal rubber block 12, and the third metal rubber block 16. The first metal rubber block 11, the second metal rubber block 12, and the third metal rubber block 16 reciprocate on the connecting pipe 3 via the steel sleeve 2, achieving a multi-stage anti-falling beam protection effect.

[0063] In this embodiment, the thickness of the first metal rubber block 11 is equal to the thickness of the third metal rubber block 16.

[0064] This emergency anti-fall beam protective cable is used alone to achieve the protection process of the corresponding multi-level buffer anti-fall beam in the horizontal bidirectional movement path of the box girder 20.

Claims

1. A multi-stage self-emergency protection cable for preventing beam falls, characterized in that: The structure includes a connecting pad (1), a steel sleeve (2), a connecting pipe (3), an internal stranded wire assembly (4), a first limiting head (5), a support (7), a central limiting steel ring (8), a first metal rubber block (11), and a second metal rubber block (12). The steel sleeve (2) is horizontally positioned, and its top side is fixedly connected to the bottom surface of the box girder (20) via the connecting pad (1). The support (7) is vertically positioned on the outer wall of the pier (21). An internal stranded wire assembly (4) is inserted inside the connecting pipe (3). The first metal rubber block (11) is fixedly connected to the outer wall of one end of the steel sleeve (2), and the outer side of the second metal rubber block (12) is fixedly connected to the inner wall of the other end of the steel sleeve (2). One end of the connecting pipe (3) is connected to the support (7), and the other end of the connecting pipe (3) passes through the steel sleeve (2), the first limiting head (5), the first limiting head (7), the second limiting steel ring (8), the first limiting head (9), the first limiting head (10), the second limiting steel ring (11), the second limiting steel ring (8), the third limiting steel ring (9), the fourth limiting steel ring (11), the fifth limiting steel ring (12), the sixth limiting steel ring (11), the seventh limiting steel ring (12), the eighth limiting steel ring (11), the ninth limiting steel ring (12), the elliptical ... The metal rubber block (11) and the second metal rubber block (12) are connected to the first limiting head (5). A central limiting steel ring (8) is fixedly installed on the connecting pipe (3). The central limiting steel ring (8) is set between the first metal rubber block (11) and the second metal rubber block (12). When the anti-fall beam multi-level self-emergency protection cable is in the first-level protection state, when the steel sleeve (2) moves horizontally away from the pier (21) with the box girder body (20), the central limiting steel ring (8) is close to the first metal rubber block (11). When the anti-fall beam multi-level self-emergency protection cable is in the second-level protection state, when the steel sleeve (2) moves horizontally away from the pier (21) with the box girder body (20), the second metal rubber block (12) is close to the first limiting head (5), and the built-in stranded wire assembly (4) is in the anti-fall beam dominant tension state. The built-in stranded wire assembly (4) includes at least three bundles of steel strands (4-1), which are arranged side by side in the connecting pipe (3). The at least three bundles of steel strands (4-1) are evenly distributed in the connecting pipe (3) along the circumferential direction of the connecting pipe (3).

2. The multi-stage self-emergency protection cable for preventing beam falls according to claim 1, characterized in that: When the steel sleeve (2) is a top-open cylinder, the top-open cylinder includes an outer shell (2-1) and two first end plates (2-2). The outer shell (2-1) is set on the bottom surface of the connecting pad (1) along the length direction of the connecting pad (1). The longitudinal cross-sectional shape of the outer shell (2-1) along its width direction is U-shaped. The two first end plates (2-2) are respectively set at both ends of the outer shell (2-1). An inner cavity (2-3) is formed between the inner wall of the outer shell (2-1) and the bottom surface of the connecting pad (1). Each first end plate (2-2) has a first through hole (2-4) processed along its thickness direction. Each first through hole (2-4) is connected to the inner cavity (2-3). The two first through holes (2-4) are respectively matched with the first metal rubber block (11) and the second metal rubber block (12). The central limiting steel ring (8) is set along the radial direction of the top open cylinder. The top of the central limiting steel ring (8) is connected to the connecting pad (1). The central limiting steel ring (8) is separated from the inner wall of the inner cavity (2-3).

3. The multi-stage self-emergency protection cable for preventing beam falls according to claim 1, characterized in that: When the steel sleeve (2) is a circumferentially sealed cylinder, the circumferentially sealed cylinder includes a steel cylinder body (2-5) and two second end plates (2-6). The steel cylinder body (2-5) is set on the bottom surface of the connecting pad (1) along the length direction of the connecting pad (1). The two second end plates (2-6) are respectively set at both ends of the steel cylinder body (2-5). Each second end plate (2-6) has a second through hole processed along its thickness direction. The two second through holes are respectively matched with the first metal rubber block (11) and the second metal rubber block (12). The central limiting steel ring (8) is set along the radial direction of the top side open cylinder. The outer circumferential edge of the central limiting steel ring (8) is separated from the inner wall of the steel cylinder body (2-5).

4. The multi-stage self-emergency protection cable for preventing beam falls according to claim 1, 2, or 3, characterized in that: A gap is provided between the inner wall of the connecting pipe (3) and the outer wall of each bundle of steel strands (4-1), and a gap is provided between two adjacent steel strands (4-1).

5. The multi-stage self-emergency protection cable for preventing beam falls according to claim 4, characterized in that: The support (7) is a composite support body. The support (7) includes a base plate (7-1), multiple support rods (7-2), an intermediate connecting plate (7-3), a through plate (7-4), and a second limiting head (7-5). One side of the base plate (7-1) is connected to the outer wall of the pier (21). The other side of the base plate (7-1) is connected to one side of the intermediate connecting plate (7-3) through multiple support rods (7-2). The other side of the intermediate connecting plate (7-3) is connected to one end of the through plate (7-4). The other end of the through plate (7-4) is connected to one side of the second limiting head (7-5). The end of the connecting pipe (3) is attached to the other side of the second limiting head (7-5). The end of each bundle of steel strands (4-1) near the second limiting head (7-5) passes through the second limiting head (7-5) and the through plate (7-4) and is fixedly connected to the intermediate connecting plate (7-3).

6. The multi-stage self-emergency protection cable for preventing beam falls according to claim 5, characterized in that: The connecting pipe (3) is connected to the support (7) through the columnar anchor rod (6). The columnar anchor rod (6) includes a connecting column (6-1) and two anchor rods (6-2). An annular protrusion (6-3) is fixedly fitted on the outer wall of the connecting column (6-1). One side of the connecting column (6-1) is fixedly connected to the connecting pipe (3) and the built-in stranded wire assembly (4) respectively. Two anchor rods (6-2) are arranged side by side on the other side of the connecting column (6-1). The support (7) is provided with a connecting shaft (14) and two lugs. (13) Two lugs (13) are fixedly connected to one side of the support (7). The connecting shaft (14) passes between the two lugs (13). The two ends of the connecting shaft (14) are respectively hinged to the two lugs (13). Each anchor rod (6-2) has a connecting hole (15) at one end near the connecting shaft (14). Each anchor rod (6-2) is connected to the connecting shaft (14) through the connecting hole (15). Each anchor rod (6-2) makes a reciprocating swinging motion along the circumference of the connecting shaft (14).

7. The multi-stage self-emergency protection cable for preventing beam falls according to claim 1, characterized in that: It also includes a third metal rubber block (16), which is fitted on the connecting pipe (3). The third metal rubber block (16) is located between the second metal rubber block (12) and the first metal rubber block (11). The third metal rubber block (16) is located close to the first metal rubber block (11). One side of the third metal rubber block (16) is fixedly connected to the inner wall of one end of the steel sleeve (2), and the other side of the third metal rubber block (16) is located towards the central limiting steel ring (8).

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