Line-driven bendable bridge and operation method thereof

Abstract

The invention discloses a line-driven bendable bridge and an operation method thereof. The line-driven bendable bridge comprises a plurality of bendable bridge unit structures, bridge piers and control lines. The bendable bridge unit structure comprises a small frame, a large frame, a wide bridge floor and a narrow bridge floor. All the bendable bridge unit structures are connected in series to form a zigzag arrangement mechanism; flattening or bending of the bendable bridge can be achieved by tightening and loosening different control wires. In the flattened state, vehicles pass through the wide bridge floor, and pedestrians pass through the narrow bridge floor. The amphibious device can be used by selecting different piers, has the advantages of being rapid in unfolding, high in bearing capacity and light in self weight, can meet the rescue requirement when major disasters suddenly occur, ensures that rescue actions are carried out in time, and protects life and property safety of people.

Description

Technical Field

[0001] This invention relates to the field of emergency rescue equipment, specifically to a line-driven bendable bridge and its operating method. Background Technology

[0002] In disaster relief operations, vehicles and supplies often need to cross waterways or collapsed roads, severely hindering rescue efforts. Traditional emergency bridges have slow response times, generally rely on heavy machinery, and may even be unable to reach the site. Even if construction begins simultaneously from both banks, it can take several hours, resulting in low efficiency. Emergency bridges need to be constructed quickly to seize the golden time for rescue, have a large load-bearing capacity to allow heavy vehicles to pass, and have a small folding volume for easy storage and rapid transport to the site.

[0003] In the design of emergency bridges, the road surface needs to be as flat as possible after unfolding; the frame needs to be easy to fold and have considerable structural strength, with pre-reserved cable-threading holes; steel cables need to be connected at the piers to achieve unfolding and retraction. Currently, the commonly used equipment in China includes two types: emergency mechanized bridges and emergency powered floating bridges, used to restore waterway and land traffic respectively. These devices have the following problems: 1. The tensioned steel cables are prone to breakage, which can cause the entire bridge to fall and be damaged, or they rely solely on their own linkage mechanism for load-bearing capacity, resulting in poor load-bearing capacity; 2. The unfolding distance is limited, making it unable to adapt to different widths; 3. There are many parts, requiring on-site assembly, and they are easily damaged by collisions during transportation. Summary of the Invention

[0004] To meet the requirements of rapid deployment, high load-bearing capacity, light weight, and amphibious use of emergency bridges, this invention provides a line-driven bendable bridge and its operation method.

[0005] The technical solution adopted by this invention to address the shortcomings of existing technologies is as follows:

[0006] According to a first aspect of this specification, a line-driven bendable bridge is provided, comprising a plurality of bendable bridge unit structures, piers, and control lines.

[0007] The flexible bridge unit structure includes a small frame, a large frame, a wide bridge deck, and a narrow bridge deck;

[0008] The main frame is a square frame structure with parallelogram-shaped sides and two diagonal through holes along the long diagonal and two horizontally arranged central through holes; there are four through holes at the four corners of the inner side of the square frame, parallel to the axis of the square frame; there is an umbrella-shaped boss in the middle of the inner side, and the umbrella surface has through holes for connecting with the narrow bridge deck.

[0009] The small frame is an I-shaped structure, with the two horizontal ends of the I-shaped structure widened into rhomboid plates perpendicular to the crossbeam. The rhomboid plates have two diagonal through holes on the long diagonal and two horizontally arranged central through holes.

[0010] The wide bridge deck is a rectangular flat plate structure, with longitudinal through holes parallel to the short sides inside both short sides;

[0011] The narrow bridge deck is a pair of connecting arm structures located on both sides of the wide bridge deck. Both ends of the connecting arm have longitudinal through holes, and one end has a limiting boss at the bottom.

[0012] The flexible bridge unit structure is assembled from the outside to the inside. First, the through hole at one end of the narrow bridge deck, the through hole in the middle of the large frame, and the through hole on the umbrella surface of the umbrella-shaped boss are hinged together. Then, the diagonal through holes of the large frame and the small frame are hinged together. Finally, the through hole at one end of the wide bridge deck and the through hole in the middle of the small frame are hinged together. After the large frame and the small frame are hinged together through the diagonal through holes, they are folded into a V-shape when viewed from the side. All the flexible bridge unit structures are connected in series to form a sawtooth-shaped arrangement.

[0013] The bridge pier is based on a large frame structure, with a base extended from the bottom and a through hole for wiring. The bridge pier can be replaced by any large frame.

[0014] The control lines pass through the four corner openings of all the main frames and finally emerge from the bottom of the piers. By tightening and loosening different control lines, the flattening or bending of the bendable bridge can be achieved.

[0015] Tighten the lower control line and loosen the upper control line to flatten the bendable bridge. When flattened, the four corner through holes on the large frame of all bendable bridge unit structures correspond to the coaxial center. The shape of the root of the umbrella-shaped boss on the large frame matches the shape of the two ends of the narrow bridge deck, forming a pedestrian walkway. The shape of the middle crossbeam on the small frame matches the shape of the two ends of the wide bridge deck, forming a carriageway.

[0016] Tighten the upper control line and loosen the lower control line to achieve the bending of the bridge, and stop when it reaches its limit.

[0017] Furthermore, in the bendable bridge unit structure at the beginning and end, the small frame is replaced with the beginning and end frames. The beginning and end frames are based on the small frame structure, and the rhomboid plates at both ends of the crossbeam are cut off by half with the short diagonal as the axis, so that the whole is U-shaped.

[0018] Furthermore, by modifying the narrow bridge deck length and hinge position of at least one bendable bridge unit structure, as well as the corresponding large frame holes, a tighter bending effect can be achieved while maintaining the flattened posture.

[0019] Furthermore, the large frame encloses the other components inside, and from the outside to the inside, they are arranged in the following order: large frame, narrow bridge deck, small frame, and wide bridge deck. The main body of each component is not in the same plane, so there will be no interference.

[0020] Furthermore, during assembly, since the through holes are blocked by the narrow bridge deck when the wide bridge deck is flat, it is first bent appropriately to expose the hinge holes before assembly.

[0021] Furthermore, by disassembling and adding the flexible bridge unit structure, different length requirements can be met.

[0022] Furthermore, the limiting boss at the bottom of the narrow bridge deck ensures that the flexible bridge can only be flattened to a certain specified angle, and there is no problem of over-expansion. Even if the control line breaks, the flexible bridge will not break and fall.

[0023] According to a second aspect of this specification, a method for operating a line-driven bendable bridge is provided, wherein the bridge pier is located in the middle of the bendable bridge, forming a two-section bendable bridge. After assembly, both ends of the bridge deck bend towards the middle, and the waterway can be connected by loading the bridge pier onto a ship.

[0024] According to a third aspect of this specification, a method for operating a line-driven bendable bridge is provided, wherein the bridge pier is located at one end of the bendable bridge, forming a single-segment bendable bridge. After assembly, the bridge deck bends to one side, allowing for rapid bridge construction directly on land.

[0025] The beneficial effects of this invention are as follows: In the structure of this invention, all units are interconnected, which greatly reduces the load on the control lines and meets the requirements for rapid deployment; the truss-like structure formed by the linkage structure demonstrates good stability and rigidity, meeting the requirements for high load; the frame structure can be made into a hollow structure and can be hollowed out in multiple places to meet the requirements for light weight, while also facilitating internal wiring; the two modes brought by the bridge piers meet the requirements for amphibious use. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is an example diagram of a bendable bridge unit structure A;

[0028] Figure 2 This is a diagram of a large framework example;

[0029] Figure 3 A small frame example diagram;

[0030] Figure 4 Example diagram of a wide bridge deck;

[0031] Figure 5 Example diagram of a narrow bridge deck;

[0032] Figure 6 This is a schematic diagram of the cross-section of the wide bridge deck;

[0033] Figure 7 This is a schematic diagram of a cross-section of a narrow bridge deck;

[0034] Figure 8 Example diagram of bridge pier B;

[0035] Figure 9 Example diagram of bridge pier C;

[0036] Figure 10 This is an example diagram of a special narrow bridge deck;

[0037] Figure 11 This is a diagram of a special large-framework example;

[0038] Figure 12 A simplified diagram of a special segmental structure;

[0039] Figure 13 A surface diagram showing the change in the angle of a bendable bridge;

[0040] Figure 14 A simplified diagram of the motion of a two-segment bendable bridge;

[0041] Figure 15 This is an example diagram of a two-section bendable bridge.

[0042] Figure 16 Example diagram of a two-section bendable bridge flattened out;

[0043] Figure 17 An example diagram of a single-segment bendable bridge;

[0044] Figure 18 This is an example diagram of a single-segment bendable bridge being flattened.

[0045] Figure 19 This is a simulation diagram of stress in a single segment;

[0046] Figure 20 This is a simulation diagram of strain in a single segment. Detailed Implementation

[0047] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0048] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0049] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0050] This embodiment provides a line-driven bendable bridge, including several bendable bridge unit structures A, piers, and control lines. For example... Figure 1 As shown, the flexible bridge unit structure A includes a small frame 1, a large frame 2, a wide bridge deck 4, and a narrow bridge deck 4, which can also be referred to as a segment.

[0051] Specifically, such as Figure 2 As shown, the main frame is a hollow rectangular structure, appearing as a parallelogram when viewed from the side. Each side has two diagonal through-holes (on the long diagonal) and two horizontally arranged central through-holes, with the eight holes' axes parallel to each other. Four through-holes parallel to the frame's axis are located at the four corners of the inner side of the frame for wiring. An umbrella-shaped boss is located in the center of the inner side, with through-holes on its surface for connection to the narrow bridge deck. The main frame encloses the other components, arranged from the outside in as the main frame, narrow bridge deck, small frame, and wide bridge deck. The main parts of each frame are not on the same plane, thus preventing interference. Figure 3 As shown, the small frame is an I-shaped structure, with the two horizontal ends of the "I" shape widened into rhomboid plates perpendicular to the crossbeam, corresponding to the side of the large frame; the two rhomboid plates have diagonal through holes (on the long diagonal) and two horizontally arranged central through holes, with the eight holes having parallel axes.

[0052] Specifically, such as Figure 4 As shown, the wide bridge deck is a rectangular flat plate structure, with longitudinal through holes parallel to the short sides inside both short sides. Figure 5 As shown, the narrow bridge deck is a pair of connecting arm structures located on both sides of the wide bridge deck. Both ends of the connecting arm have longitudinal through holes, the four holes are parallel to each other, and one end of the connecting arm has a limiting boss at the bottom.

[0053] The flexible bridge unit structure A is assembled from the outside in. First, the through-hole at one end of the narrow bridge deck, the through-hole in the middle of the large frame, and the through-hole on the umbrella surface of the umbrella-shaped boss are hinged. Then, the diagonal through-holes of the large frame and the small frame are hinged. Finally, the through-hole at one end of the wide bridge deck and the through-hole in the middle of the small frame are hinged, thus completing the assembly of one unit. When assembling the wide bridge deck, since the through-holes are blocked by the narrow bridge deck when flattened, they can be bent appropriately to expose the hinge holes. After the large frame and the small frame are hinged through the diagonal through-holes, they fold into a V-shape when viewed from the side, and the various units are connected in series to form a sawtooth-shaped arrangement. When the flexible bridge unit structure A is flat, the wide bridge deck and the narrow bridge deck are coplanar; when bent, the wide bridge deck and the narrow bridge deck appear as an intersecting structure when viewed from the side. Different lengths can be achieved by disassembling and adding the flexible bridge unit structure A.

[0054] In this embodiment, in the bendable bridge unit structure A at the first and last ends, the small frame is replaced with the first and last frames. Specifically, the first and last frames are modified based on the small frame structure. The rhomboid plates at both ends of the crossbeam are cut in half along the short diagonal, and the whole structure is U-shaped.

[0055] In this embodiment, the line-driven bendable bridge includes two types of piers, denoted as pier B and pier C. Piers B and C are modified from the main frame structure, with rectangular blocks stretched out at the bottom to serve as the base. The central hollow and bottom groove are used for cable routing. Specifically, pier B, viewed from the side, is hourglass-shaped with the same hole positions as the main frame. Pier C, viewed from the side, is a combination of a parallelogram on top and a trapezoid on the bottom. The inner center of pier C also has four vertical through holes for the control line to pass through, and the axes of the four holes are parallel to each other. When assembling the line-driven bendable bridge, piers B and C can arbitrarily replace the main frame.

[0056] In this embodiment, the control lines pass through the through holes at the four corners of the main frame. The upper control line passes through the inner through hole in the middle of the pier and emerges from the bottom of the pier, while the lower control line exits directly from the bottom. By tightening and loosening different control lines, the bendable bridge can be flattened or bent upwards into a loop shape. Specifically:

[0057] When flattened, the four corner through holes on the main frame of all bendable bridge unit structure A are coaxial, and the axes of the four holes are parallel to each other. The shape of the root of the umbrella-shaped boss on the main frame matches the shape of the two ends of the narrow bridge deck, and the shape of the middle crossbeam on the small frame matches the shape of the two ends of the wide bridge deck, minimizing the gaps between components during flattening. The limiting boss at the bottom of the narrow bridge deck ensures that the maximum flattening is limited to a specific angle. Therefore, a certain height difference is allowed between the two banks to be connected.

[0058] When the bridge is curved, if pier B is used, the pier is in the middle of the flexible bridge and both ends of the bridge deck bend towards the middle. At this time, the waterway can be connected by using the pier on a ship. If pier C is used, the pier is at one end of the flexible bridge and the bridge deck bends to one side. At this time, the bridge can be quickly built directly on land.

[0059] In one embodiment, a special segment is designed to further facilitate transportation, featuring a uniquely narrow bridge deck and a special large frame. The special narrow bridge deck and large frame are modified from their original forms, altering the hinge position between them; specifically, the narrow bridge deck is lengthened, and the large frame has more openings. While keeping other segments unchanged, by modifying the length of the narrow bridge deck and the hinge position of a specific intermediate segment, as well as the corresponding openings in the large frame, a tighter bending effect can be achieved while maintaining the flattened posture.

[0060] Reference Figure 6 , Figure 7The vehicular lane consists of a wide bridge deck and small frame crossbeams, while the pedestrian lane consists of a narrow bridge deck and the base of umbrella-shaped bosses in the large frame. The cross-sectional view clearly shows that the shape of the base of the umbrella-shaped bosses in the large frame matches the shape of the two ends of the narrow bridge deck, and the shape of the central crossbeam in the small frame matches the shape of the two ends of the wide bridge deck. This minimizes the gaps between components when flattened, effectively preventing tire jamming and ensuring safety and reliability.

[0061] Reference Figure 8 , Figure 9 After all units are connected, the control line passes through the four corner holes of all the main frames and finally emerges from the bottom of the pier. The pier base can be installed on the ship or foundation using fixing bolts, etc., and the line can be wound up using a reel device.

[0062] Reference Figure 10 , Figure 11 , Figure 12 , Figure 13 By modifying the length of the narrow bridge deck and the hinge position of the intermediate segment, as well as the corresponding large frame holes, a tighter bending effect can be achieved while maintaining the flattening effect. Since the hinge position is fixed, the length of a segment including the special narrow bridge deck must be selected so that the flattened state of the bendable bridge remains unchanged, only the degree of bending is altered. The relationship between the degree of bending and the hinge position is determined by a formula. Known structural parameters:

[0063]

[0064] Where θ is the angle between the lines connecting the hinge points of the two frames in a single segment. β is the angle between the lines connecting the hinge points of the large frame of this segment and the small frame of the next segment. l1 is the line connecting the middle hinge point and its nearest edge hinge point, l2 is the line connecting the hinge points, and β is the angle between l1 and l2 in a single frame.

[0065] To change the curvature of a specific segment and alter its central hinge point, let m be the line connecting the new hinge point to its nearest edge hinge point, γ be the angle between m and l2, and d be the line connecting two new hinge points in the special segment. m, γ, and d must satisfy the following equation:

[0066]

[0067] Solving the triangle using geometric relationships, we have:

[0068] θ s =θ-β

[0069]

[0070] θ ′ =θ b -ζ2-γ

[0071] Δθ=θ ′ -θ

[0072] Where, θ s Let l1 be the angle between the smaller frame l1 and the larger frame l2, and let a be the third side of the triangle formed by l1, l2, and l2. Let ζ1 be the angle between l2 and a in this triangle. Let a be the angle between a and the next segment, small frame l1. Let θ be the angle between m and the next segment small frame l2, b be the third side of the triangle formed by m and the next segment small frame l2, and ζ2 be the angle between l2 and b in this triangle. b Let γ be the angle between b and the next segment m, and θ' be the angle between the lines connecting the hinge points of the two frames in the next segment. By inputting the ranges of γ and m (i.e., the range of hinge positions), a graph showing the relationship between Δθ and the hinge position can be obtained.

[0073] Reference Figure 14 , Figure 15 , Figure 16 This is a simplified kinematic diagram and a schematic diagram of the unfolded bending of a two-segment bendable bridge. Several special segments are used, and the appropriate degree of bending is selected based on the data given by the formula to achieve a parameter configuration that achieves tight convergence without interference.

[0074] Reference Figure 17 , Figure 18 This is a schematic diagram illustrating the unfolding and bending of a single-section bendable bridge. When transported to the disaster relief site, the bendable bridge is in its assembled bent state. To flatten it, tighten the lower control line and loosen the upper control line. Due to the presence of the upper limit boss on the small frame, there is no issue of over-unfolding; even if the control line breaks, the bendable bridge will not break and fall. In the flattened state, vehicles can travel on the wider side of the bridge, and pedestrians can travel on the narrower side. To bend it, tighten the upper control line and loosen the lower control line, stopping when it reaches its limit.

[0075] Reference Figure 19 , Figure 20 This is a stress-strain simulation diagram for a single segment. The bridge deck material is set to aluminum alloy, the frame material is structural steel, and a pressure of 3 MPa is applied, approximately the pressure exerted by a fire truck on the ground. It can be seen that the stress and strain are all within safe limits.

[0076] The following is a specific operational plan: When the road surface collapse is wide, a single-section flexible bridge (i.e., the pier is located at one end of the bridge) is used, and the flexible bridge is lowered simultaneously from both banks. Similarly, when restoring waterway traffic, situations may arise where the water surface is very wide. In this case, multiple rescue vessels can be equipped with the flexible bridge described in this invention, using a two-section flexible bridge (i.e., the pier is located in the middle of the bridge), with multiple bridges connected end to end to achieve relay on the water.

[0077] The above description is merely a preferred embodiment of the present invention. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall still fall within the protection scope of the technical solutions of the present invention.

Claims

1. A line-driven bendable bridge, characterized in that, It includes several bendable bridge unit structures, piers, and control lines; The flexible bridge unit structure includes a small frame, a large frame, a wide bridge deck, and a narrow bridge deck; The main frame is a square frame structure with parallelogram-shaped sides and two diagonal through holes along the long diagonal and two horizontally arranged central through holes; there are four through holes at the four corners of the inner side of the square frame, parallel to the axis of the square frame; there is an umbrella-shaped boss in the middle of the inner side, and the umbrella surface has through holes for connecting with the narrow bridge deck. The small frame is an I-shaped structure, with the two horizontal ends of the I-shaped structure widened into rhomboid plates perpendicular to the crossbeam. The rhomboid plates have two diagonal through holes on the long diagonal and two horizontally arranged central through holes. The wide bridge deck is a rectangular flat plate structure, with longitudinal through holes parallel to the short sides inside both short sides; The narrow bridge deck is a pair of connecting arm structures located on both sides of the wide bridge deck. Both ends of the connecting arm have longitudinal through holes, and one end has a limiting boss at the bottom. The flexible bridge unit structure is assembled from the outside to the inside. First, the through hole at one end of the narrow bridge deck, the through hole in the middle of the large frame, and the through hole on the umbrella surface of the umbrella-shaped boss are hinged together. Then, the diagonal through holes of the large frame and the small frame are hinged together. Finally, the through hole at one end of the wide bridge deck and the through hole in the middle of the small frame are hinged together. After the large frame and the small frame are hinged together through the diagonal through holes, they are folded into a V-shape when viewed from the side. All the flexible bridge unit structures are connected in series to form a sawtooth-shaped arrangement. The bridge pier is based on a large frame structure, with a base extended from the bottom and a through hole for wiring. The bridge pier can be replaced by any large frame. The control lines pass through the four corner openings of all the main frames and finally emerge from the bottom of the piers. By tightening and loosening different control lines, the flattening or bending of the bendable bridge can be achieved. Tighten the lower control line and loosen the upper control line to flatten the bendable bridge. When flattened, the four corner through holes on the large frame of all bendable bridge unit structures correspond to the coaxial center. The shape of the root of the umbrella-shaped boss on the large frame matches the shape of the two ends of the narrow bridge deck, forming a pedestrian walkway. The shape of the middle crossbeam on the small frame matches the shape of the two ends of the wide bridge deck, forming a carriageway. Tighten the upper control line and loosen the lower control line to achieve the bending of the bridge, and stop when it reaches its limit.

2. The wire-driven bendable bridge according to claim 1, characterized in that, In the bendable bridge unit structure at the beginning and end, the small frame is replaced with the beginning and end frames. The beginning and end frames are based on the small frame structure, and the rhomboid plates at both ends of the crossbeam are cut off by half with the short diagonal as the axis, so that the whole is U-shaped.

3. The wire-driven bendable bridge according to claim 1, characterized in that, Modify the narrow bridge deck length and hinge position of at least one bendable bridge unit structure, as well as the corresponding large frame holes, to achieve a tighter bending effect while maintaining the flattened posture.

4. The wire-driven bendable bridge according to claim 1, characterized in that, The large frame encloses the other components inside, and from the outside to the inside, they are the large frame, the narrow bridge deck, the small frame, and the wide bridge deck. The main body of each component is not in the same plane, so there will be no interference.

5. The wire-driven bendable bridge according to claim 1, characterized in that, When assembling the wide bridge deck, since the through holes will be blocked by the narrow bridge deck when it is flat, it should be bent appropriately to expose the hinge holes before assembly.

6. The wire-driven bendable bridge according to claim 1, characterized in that, By disassembling and adding the flexible bridge unit structure, different length requirements can be met.

7. The wire-driven bendable bridge according to claim 1, characterized in that, The limiting boss at the bottom of the narrow bridge deck ensures that the flexible bridge can only be flattened to a certain specified angle, and there is no problem of over-expansion. Even if the control line breaks, the flexible bridge will not break and fall.

8. A method for operating a line-driven bendable bridge according to any one of claims 1-7, characterized in that, The pier is located in the middle of the flexible bridge, forming a two-section flexible bridge. After assembly, both ends of the bridge deck bend towards the middle, and the waterway can be connected by a ship carrying the pier.

9. A method for operating a line-driven bendable bridge according to any one of claims 1-7, characterized in that, The piers are located at one end of the flexible bridge, forming a single-section flexible bridge. After assembly, the bridge deck bends to one side, allowing for rapid bridge construction directly on land.

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