A foldable Bailey frame and its folding method

Abstract

This invention discloses a foldable Bailey bridge and its folding method, belonging to the field of bridge engineering. It includes a bridge section and a bridge deck section. The bridge section comprises two load-bearing bodies; each load-bearing body includes multiple elongated profiles and a first rotating component disposed on the connecting surface between adjacent profiles. The bridge deck section includes multiple rectangular frames, a second rotating component and / or a third rotating component disposed between adjacent rectangular frames, multiple bridge deck paving materials fixedly installed on the upper surface of the rectangular frames, and pulleys disposed on both sides of the lower surface of the rectangular frames and movable relative to the load-bearing bodies. The foldable Bailey bridge of this invention can provide efficient protection and support for emergency rescue passage (e.g., damaged docks), enhancing protection capabilities and providing good backup and logistical support for sudden emergencies.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering, and in particular to a foldable Bailey bridge and its folding method. Background Technology

[0002] Today, Bailey bridges are widely used in transportation construction projects and disaster relief projects. In particular, the application of Bailey bridges is ubiquitous in transportation construction projects, making them an irreplaceable material in the engineering field.

[0003] With the continuous development of the construction industry, new types of bridge structures are emerging. However, when facing complex construction environments with varied terrain, erecting traditional Bailey bridges (321 steel frame bridges) is neither economical nor easy, requiring cranes for bridge deck paving. It also has very high requirements for the terrain, and even short-distance erection involves complex procedures. Currently, domestic Bailey bridges—prefabricated highway steel bridges—are complex to erect, have numerous components, high transportation costs, and require significant time and manpower for assembly and disassembly. Summary of the Invention

[0004] To overcome the aforementioned technical deficiencies, the present invention provides a foldable Bailey bridge and its folding method to solve the problems involved in the background art.

[0005] This invention provides a foldable Bailey frame, comprising:

[0006] The bridge section includes two load-bearing bodies; each load-bearing body includes multiple elongated profiles and a first rotating component disposed on the connecting surface between two adjacent profiles, allowing the two adjacent profiles to rotate along one side of their connecting surface;

[0007] The bridge deck includes multiple rectangular frames, a second rotating member and / or a third rotating member disposed between two adjacent rectangular frames, multiple bridge deck paving materials fixedly installed on the upper surface of the rectangular frames, and pulleys disposed on both sides of the lower surface of the rectangular frames, respectively engaged on two load-bearing bodies, and movable relative to the load-bearing bodies.

[0008] In the unfolded state, the profiles are located on the same axis, and the two supporting bodies are parallel to each other; the rectangular frame is located on the same plane and is parallel to the plane where the two supporting bodies are located.

[0009] In the folded state, the sides of two adjacent profiles are fitted together or spaced apart by a predetermined gap, and the lower surfaces of the rectangular frame are spaced apart by a predetermined gap and placed vertically on the same profile.

[0010] Preferably or optionally, the cross-sectional shape of the profile is or approximately H-shaped; and in the unfolded state, the web of the profile is perpendicular to the bridge deck portion.

[0011] Preferably or optionally, the side of the profile is provided with a waist-shaped through hole;

[0012] Furthermore, in the folded state, the waist-shaped through holes on the square outer frame overlap or partially overlap with each other, and the profile is fixed and locked by the first fastener passing through the waist-shaped through holes in sequence.

[0013] Preferably or optionally, the first rotating component includes: two reinforcing plates respectively fixedly installed on the end faces of two adjacent profiles; a first hinge fixedly installed on one side of the two reinforcing plates by bolts or screws; a connecting plate disposed on the other side of the connection surface between one of the reinforcing plates and the first hinge; a first through hole located on the connecting plate and passing through the other side of the connection surface between one of the reinforcing plates and the first hinge; a pin disposed on the other side of the connection surface between the other reinforcing plate and the first hinge and cooperating with the first through hole; and a locking component disposed on the pin.

[0014] Preferably or optionally, the rectangular frame is composed of a square outer frame and an inner diagonal frame; multiple attachments are distributed on both sides of the square outer frame;

[0015] Furthermore, in the folded state, the attachments on the profile overlap or partially overlap with each other, and the relative positions of the two outermost attachments of the rectangular frame are defined by the second fastener, thereby fixing and locking the rectangular frame.

[0016] Preferably or optionally, the second rotating member is disposed on the upper part of the two rectangular frames on the adjacent sides, and the second rotating member includes: two second hinges disposed between the connecting end faces of the two adjacent rectangular frames;

[0017] The third rotating component is disposed at the lower part of the two rectangular frames on the adjacent sides. The third rotating component includes: a transition frame located between the two adjacent rectangular frames, and two second hinges respectively disposed on both sides of the transition frame and between the connecting end faces of the two adjacent rectangular frames.

[0018] Preferably or optionally, the width of the adapter frame is at least greater than the sum of the heights of the two pulleys.

[0019] Preferably or optionally, the pulley includes: a mounting base disposed on the lower surface of the rectangular frame, a roller shaft rotatably mounted on the mounting base and slidably mounted on the profile, and limiting wing wheels disposed on both sides of the roller shaft.

[0020] Preferably or optionally, the spacing between the load-bearing bodies is equal to or approximately equal to the axle width of the vehicle to be passed.

[0021] The present invention also provides a folding method for the aforementioned folding Bailey frame, comprising:

[0022] Move the rectangular frames along the supporting body, and make the profiles move along the second and third rotating members, until all the rectangular frames are placed vertically on the same profile;

[0023] The first fastener passes through the overlapping or partially overlapping waist-shaped through holes in sequence to fix and lock the profile.

[0024] Then, by rotating the load-bearing body along the first rotating member, the sides of the two adjacent profiles are brought into contact with each other or separated by a predetermined gap.

[0025] The second fastener defines the relative positions of the two outermost attachments of the rectangular frame, thereby fixing and locking the rectangular frame.

[0026] This invention relates to a folding Bailey bridge and its folding method, which has the following advantages compared to the prior art:

[0027] 1. This invention uses a long strip profile as the main load-bearing body, which rotates and folds along the first rotating member; multiple pulleys are set on the underside of the bridge deck structure, so that when unfolding, the weight of the bridge deck itself and the pressure generated when vehicles pass are distributed at multiple points on the load-bearing surface of the bridge, so that it is evenly distributed on the bridge deck along the overall length of the main load-bearing body; when folding, the bridge deck part slides along the main load-bearing body through the pulleys to fold into an M shape. The entire folding and unfolding process is convenient and fast, and the overall structure after folding is compact and easy to transport.

[0028] 2. This invention uses H-beams as the main structural component, which inherently possesses good yield strength and bending resistance. The placement direction and assembly method are designed specifically for the structural strength of H-beams. Compared to traditional splicing structures, the current folding structure is more convenient.

[0029] 3. In this invention, the first fixing member passes through the waist-shaped through hole in sequence to shape and align the folded profile, and the nut locks and fixes the profile.

[0030] 4. On the one hand, the present invention adopts a pivot hinge connection, which is structurally stable and reliable, with stable stress and extremely simple folding method, making it easy to operate. On the other hand, the pivot hinge structure is improved by designing a connecting plate and locking parts to ensure the structural stability of the load-bearing body after it is unfolded.

[0031] 5. The bridge deck pavement of the present invention adopts a split design, and a pivot can be set at the center of the X-shaped structure of the diagonal frame. The width of the bridge deck pavement can be adaptively adjusted by stretching the width between the bridges to accommodate vehicles with different axle widths. On the basis of the same overall structural quality, it is flexible and versatile to meet the needs of vehicles with various axle widths.

[0032] 6. The present invention uses the second fastener to pass through the fourth through hole on the rectangular frame in sequence to shape and align the folded rectangular frame, and uses the nut to lock and fix the profile.

[0033] 7. By setting a second rotating member and a third rotating member, and the third rotating member including a transition frame, the pulleys at the bottom of the two rectangular frames on adjacent sides can be hidden in the space formed by the transition frame in the folded state, thus ensuring the structural stability after folding.

[0034] 8. By designing the pulley, the radius of the limiting wing wheel is larger than the radius of the roller shaft, and the pulley is clamped on the upper surface of the profile. It has a certain offset tolerance rate, which prevents the pulley from derailing when the bridge surface jumps, thereby improving the structural stability of the entire Bailey bridge.

[0035] 9. In this invention, the spacing between the load-bearing bodies is equal to or approximately equal to the axle width of the vehicle to be passed, thereby distributing the force as much as possible between the load-bearing bodies and ensuring the stability of the vehicle as it passes.

[0036] In summary, the folding Bailey bridge in this invention can provide efficient protection and support for emergency rescue passage (such as damaged docks), enhance protection capabilities, and provide good backup and logistical support capabilities for sudden emergencies. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the present invention in its unfolded state.

[0038] Figure 2 This is a schematic diagram of the structure of the present invention in its folded state.

[0039] Figure 3 This is a schematic diagram of the rectangular frame structure in this invention.

[0040] Figure 4 This is a schematic diagram of the pulley and profile in this invention.

[0041] Figure 5 This is a schematic diagram of the structure of the first rotating component in this invention.

[0042] Figure 6 This is a schematic diagram of the structure of the second and third rotating parts of the present invention.

[0043] The reference numerals in the attached drawings are as follows: 110, load-bearing body; 120, profile; 121, waist-shaped through hole; 122, web plate; 123, flange plate; 130, first rotating component; 131, reinforcing plate; 132, first hinge; 133, connecting plate; 134, first through hole; 135, pin; 136, third through hole; 137, secondary pin;

[0044] 210. Rectangular frame; 211. Square outer frame; 212. Diagonal frame; 213. Attachment; 220. Second rotating component; 230. Third rotating component; 231. Adapter frame; 232. Second hinge; 240. Pulley; 241. Mounting base; 242. Roller; 243. Limiting wing wheel; 250. Bridge deck paving;

[0045] 300. First fastener;

[0046] 400. Second fastener. Detailed Implementation

[0047] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0048] See appendix Figures 1 to 6 A folding Bailey bridge includes: a bridge section, a bridge deck section, and an upper-supported rectangular frame 210.

[0049] The bridge section includes at least two load-bearing bodies 110. Each load-bearing body 110 includes multiple elongated profiles 120 and a first rotating member 130 disposed on the connecting surface between two adjacent profiles 120, allowing the two adjacent profiles 120 to rotate along one side of their connecting surface. The bridge deck section includes multiple rectangular frames 210, a second rotating member 220 disposed between two adjacent rectangular frames 210, multiple bridge deck paving materials 250 fixedly installed on the upper surface of the rectangular frames 210, and pulleys 240 disposed on both sides of the lower surface of the rectangular frames 210, respectively engaged on the two load-bearing bodies 110, and movable relative to each other along the load-bearing bodies 110.

[0050] In the unfolded state, the profiles 120 are located on the same axis, and the two supporting bodies 110 are parallel to each other; the rectangular frame 210 is located on the same plane and is parallel to the plane where the two supporting bodies 110 are located; in the folded state, the sides of the two adjacent profiles 120 are close to each other or have a predetermined gap between them, the lower surfaces of the rectangular frame 210 have a predetermined gap between them, and are placed vertically on the same profile 120.

[0051] In a further embodiment, the profile 120 is designed as a three-section folding structure, and the rectangular frame 210 adopts a four-section folding structure, forming an M-shape after folding. The first two sections face each other bottom to bottom, the middle section faces each other top to top, and the last two sections face each other bottom to bottom. It should be noted that the rectangular frame 210 is folded fewer times than the profile 120 to avoid overlapping folding points between the rectangular frame 210 and the profile 120, thereby improving the structural strength of the Bailey bridge.

[0052] In a further embodiment, see Appendix Figure 4 The profile 120 is an H-beam with a cross-sectional shape of H or approximately H-shaped. The H-beam has a specification of 400*400*13*21 (mm) and an internal dimension of 358mm. The two H-beam sections are connected by a reinforcing plate 131, which is made of 16mm thick steel plate and fixed to the H-beam with M18 bolts. In the unfolded state, the web 122 of the profile 120 is perpendicular to the bridge deck, and the flange 123 of the profile 120 is attached to the bridge deck, increasing the stress-bearing area and resulting in less deformation under the same pressure compared to other placement methods.

[0053] See appendix Figure 5 The first rotating component 130 includes: two reinforcing plates 131 respectively fixedly installed on the end faces of two adjacent profiles 120; a first hinge 132 fixedly installed on one side of the two reinforcing plates 131 by bolts or screws; a connecting plate 133 disposed on the other side of the connecting surface of one of the reinforcing plates 131 and the first hinge 132; a first through hole 134 located on the connecting plate 133 and passing through the other side of the connecting surface of one of the reinforcing plates 131 and the first hinge 132; a pin 135 disposed on the other side of the connecting surface of the other reinforcing plate 131 and the first hinge 132 and cooperating with the first through hole 134; and a locking member disposed on the pin 135. During the unfolding process, the profiles 120 are rotated along the axis of rotation of the first hinge 132 until the sides of the two adjacent profiles 120 are in contact with each other or separated by a predetermined gap, and then the pin 135 passes through the first through hole 134 and is fixed by cooperating with the locking member. The locking element can be a third through hole 136 located at the other end of the pin 135 and a separable secondary pin 137 that cooperates with it; the locking element can also be a third through hole 136 located at the other end of the pin 135 and a secondary pin 137 with a certain elasticity and retractability that cooperates with it, to prevent the pin 135 from disengaging and to ensure the stability of the profile 120.

[0054] It should be noted that the first hinge 132 is fixed to the reinforcing plates 131 on both sides of the connecting surface near the pivot using bolts or screws. A connecting plate 133 is provided on the connecting surface away from the pivot on both sides of the first hinge 132, and the bolts or screws distributed on the connecting surfaces are staggered to ensure that the two connecting surfaces remain in contact when two adjacent profiles 120 are unfolded.

[0055] In a further embodiment, each side of the profile 120 is provided with a waist-shaped through hole 121. In the folded state, the sides of the profile 120 overlap or are spaced apart by a predetermined gap. At this time, the waist-shaped through holes 121 on the square outer frame 211 overlap or partially overlap. The profile 120 is fixed and locked by the first fixing member 300 passing through the waist-shaped through holes 121 in sequence. The first fixing member 300 is a bolt or screw and a nut that mates with it. The "partial overlap" is due to the certain installation tolerance between the profiles 120, so there is a certain deviation between the waist-shaped through holes. When the first fixing member 300 passes through the waist-shaped holes in sequence, it can also play a shaping role to ensure that the profiles 120 are aligned with each other.

[0056] See appendix Figure 3 The rectangular frame 210 consists of a square outer frame 211 and an inner diagonal frame 212, with each side connected and fixed using welding to achieve uniform and stable stress distribution. Multiple attachments 213 are distributed on both sides of the square outer frame 211. Both the square outer frame 211 and the diagonal frame 212 are made of standard H-beams, with a specification of 175*175*7.5*11 (mm). The large bearing surface of the H-beams allows for even distribution of the pressure exerted by the pavement on the rectangular frame 210, resulting in a stable and deformation-resistant structure. The bridge deck pavement 250 is made of 8mm thick stainless steel checkered plate or 8mm thick carbon steel plate, which, while possessing high strength, is less prone to deformation, thus preventing multi-directional stress on the supporting rectangular frame 210 and potential twisting.

[0057] The bridge deck pavement 250 mainly adopts a split design, and a pivot can be set at the center of the X-shaped structure of the diagonal frame 212. The width of the bridge deck pavement 250 can be adaptively adjusted by stretching the width between the bridge sections to accommodate vehicles with different axle widths. While maintaining the same overall structural quality, it is flexible and adaptable to meet the needs of vehicles with various axle widths. Preferably, the spacing between the load-bearing main bodies 110 is equal to or approximately equal to the axle width of the vehicle to be passed, improving the overall load-bearing capacity of the Bailey bridge.

[0058] The lower side of the rectangular frame 210 is provided with multiple pulleys 240, see appendix. Figure 3The pulley 240 includes: a mounting base 241 disposed on the lower surface of the rectangular frame 210, a roller shaft 242 rotatably mounted on the mounting base 241 and slidably mounted on the flange plate 123 of the profile 120, and limiting vanes 243 disposed on both sides of the roller shaft 242.

[0059] During deployment, the weight of the bridge deck itself and the pressure generated by vehicles passing over it are distributed at multiple points on the stress surface of the bridge, reducing the pressure on individual points and ensuring even distribution along the entire length of the bridge, thereby improving the overall structural strength of the Bailey bridge. The distance between the limiting wing wheels 243 on both sides is slightly larger than the width of the profile 120. This not only ensures that the roller 242 moves linearly along the profile 120 with a certain degree of offset tolerance, but also prevents the rectangular frame 210 from shifting left or right, achieving horizontal positioning of the bridge deck portion. Furthermore, the radius of the limiting wing wheels 243 is larger than the radius of the roller 242, securing the pulley 240 to the upper surface of the profile 120, preventing the pulley 240 from derailing when the bridge deck bounces, and improving the overall structural stability of the Bailey bridge. Considering the presence of the limiting wing wheel 243, the sides of two adjacent profiles 120 are spaced apart by a predetermined gap. In the folded state, the limiting wing wheel 243 can be accommodated within the predetermined gap between the sides of the two adjacent profiles 120.

[0060] Due to the presence of the pulley 240, the second rotating member 220 is disposed on the upper part of the two rectangular frames 210 on the adjacent sides, and the third rotating member 230 is disposed on the lower part of the two rectangular frames 210 on the adjacent sides. The third rotating member 230 includes a connecting frame 231. In the folded state, the pulleys 240 at the bottom of the two rectangular frames 210 on the adjacent sides can be hidden within the space formed by the connecting frame 231. (See appendix) Figure 6The second rotating component 220 includes two second hinges 232 disposed between the connecting end faces of two adjacent rectangular frames 210; the third rotating component 230 includes a transition frame 231 located between two adjacent rectangular frames 210, and two second hinges 232 disposed on both sides of the transition frame 231 and between the connecting end faces of two adjacent rectangular frames 210. Taking a rectangular frame 210 with a four-segment folding structure as an example, in the folded state, it forms an M-shape. The bottom surfaces of the first and second rectangular frames 210 face each other, and the top of the first and second rectangular frames 210 forms a transition frame 231. The pulleys 240 at the bottom of the first and second rectangular frames 210 are located on the profile 120 and parallel to the transition frame 231, hidden within the space formed by the transition frame 231. The top surfaces of the second and third rectangular frames 210 face each other. The bottom surfaces of the last two sections of the third and fourth rectangular frames 210 face each other, and the top of the third and fourth rectangular frames 210 forms a transition frame 231. The pulleys 240 at the bottom of the third and fourth rectangular frames 210 are located on the profile 120 and parallel to the transition frame 231, hidden within the space formed by the transition frame 231.

[0061] In a further embodiment, multiple attachments 213 are distributed on both sides of the square outer frame 211. Each attachment 213 can be a handle, a lug, or a mounting base 241 for the upper-supported rectangular frame 210. A fourth through hole is provided along the axial direction of each attachment 213. In the folded state, the attachments 213 on the profile 120 overlap or partially overlap. The relative positions of the two outermost attachments 213 of the rectangular frame 210 are defined by the second fixing member 400, thus fixing and locking the rectangular frame 210. The second fixing member 400 is a steel bar shaped like or approximately "[" and separable nuts screwed to both ends of the steel bar. By inserting both ends of the second fixing member 400 into the fourth through hole, the rectangular frame 210 is shaped and aligned. Finally, the rectangular frame 210 is fixed and locked by the separable nuts.

[0062] In addition, a detachable limiting device is provided on the supporting body 110 to limit the relative position of the pulley 240 with respect to the supporting body 110, thereby ensuring the stability of the bridge deck portion when the rectangular frame 210 is unfolded. The detachable limiting device includes a mounting part that is detachably mounted on the supporting body 110, and a limiting part that is fixedly mounted on the mounting part; the limiting part is a groove adapted to the outer wheel of the pulley 240.

[0063] For some Bailey bridge structures, an upper-bearing rectangular frame 210 is also included. This upper-bearing rectangular frame 210 is constructed using standard H-beams. Each rectangular frame 210 has a trapezoidal design with a triangular internal distribution, and is manufactured using welding technology to achieve maximum stability and strength. The H-beams in the upper-bearing rectangular frame 210 are planned to be 150*150*7*10 (mm) in size, ensuring good triangular stability and preventing distortion. The 150mm width facilitates the connection and fixing of the upper-bearing rectangular frame 210 to the bridge deck, providing ample working space and strong overall stability. The upper-bearing rectangular frame 210 is bolted to the bridge deck. M16 bolts are planned to be used, passing through the bottom layer of the upper-bearing rectangular frame 210, the 250 layers of bridge deck pavement, and the bridge deck structural layer. After fixing, it forms a unified structure with the bridge deck, further enhancing the overall structural strength of the bridge deck and ensuring safe vehicle passage.

[0064] To facilitate understanding of the technical solution of the folding Bailey frame, its folding and unfolding process is briefly described as follows: During the folding process, the detachable limiting device on the supporting body 110 is first disassembled. The rectangular frame 210 is moved along the supporting body 110, and the profile 120 is moved along the second rotating member 220 and the third rotating member 230, until all the rectangular frames 210 are placed vertically on the same profile 120; at this time, the rectangular frames 210 are folded into an M-shape, with the bottom surfaces of the first rectangular frame 210 and the second rectangular frame 210 facing each other, and the top of the first rectangular frame 210 and the second rectangular frame 210 forming a transition frame 231. The pulleys 240 at the bottom of the first rectangular frame 210 and the second rectangular frame 210 are located on the profile 120 and parallel to the transition frame 231, hidden in the space formed by the transition frame 231. Inside; the top surfaces of the second rectangular frame 210 and the third rectangular frame 210 face each other; the bottom surfaces of the last two rectangular frames 210 and the fourth rectangular frame 210 face each other, and the top is a transition frame 231; the pulleys 240 at the bottom of the third rectangular frame 210 and the fourth rectangular frame 210 are located on the profile 120 and parallel to the transition frame 231, hidden in the space formed by the transition frame 231; then, by inserting the two ends of the second fixing member 400 into the fourth through hole, the rectangular frame 210 is shaped and aligned; finally, the rectangular frame 210 is fixed and locked by a separable nut. Then, by rotating the bearing body 110 along the first rotating member 130 until the sides of the two adjacent profiles 120 are spaced apart by a predetermined gap, the limiting wing wheel 243 can be accommodated within the predetermined gap between the sides of the two adjacent profiles 120. Then, by inserting both ends of the second fixing member 400 into the fourth through hole, the rectangular frame 210 is shaped and aligned. Finally, the rectangular frame 210 is fixed and locked by a separable nut.

[0065] In this embodiment, the folding Bailey bridge adopts a combined upper-bearing and lower-bearing design. The lower-bearing bridge section serves as the main load-bearing component, while the upper-bearing bridge deck section acts as an auxiliary stress-dispersing component, distributing the overall bridge load to both the upper and lower sides, making the overall structure more stable and reliable. The bridge section uses heavy-duty H-beams as the main load-bearing component 110, and the bridge deck section uses a cross-reinforced frame as the main load-bearing component 110. Stainless steel high-strength plates or carbon steel plates of equal thickness are used as the bridge deck paving material 250. The upper-bearing guardrail uses a cross-reinforced frame as the overall structure, achieving triple reinforcement for load-bearing capacity. The bridge is unfolded / folded in three sections or higher, and the bridge deck uses an M-shaped folding form, allowing for horizontal unfolding / folding. The upper-bearing frame uses a plug-in form to enhance the overall structural stability of the bridge deck. The bridge and bridge deck are integrated when unfolded / folded, not placed separately, while the upper-bearing frame is placed separately, allowing for quick deployment and immediate use.

[0066] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A folding Bailey frame, characterized in that, include: The bridge section includes two load-bearing bodies; each load-bearing body includes multiple elongated profiles and a first rotating component disposed on the connecting surface between two adjacent profiles, allowing the two adjacent profiles to rotate along one side of their connecting surface; The bridge deck includes multiple rectangular frames, each consisting of a square outer frame and an inner diagonal frame. A second and a third rotating component are disposed between two adjacent rectangular frames. Multiple bridge deck paving materials are fixedly installed on the upper surface of the rectangular frames. Pullers are disposed on both sides of the lower surface of the rectangular frames, respectively mounted on two load-bearing bodies, and can move relative to the load-bearing bodies. In the unfolded state, the profiles are located on the same axis, and the two supporting bodies are parallel to each other; the rectangular frame is located on the same plane and is parallel to the plane where the two supporting bodies are located. In the folded state, the sides of two adjacent profiles are fitted together or spaced apart by a predetermined gap, and the lower surfaces of the rectangular frame are spaced apart by a predetermined gap and placed vertically on the same profile.

2. The folding Bailey frame according to claim 1, characterized in that, The profile has an H-shaped cross-section; and in the unfolded state, the web of the profile is perpendicular to the bridge deck portion.

3. The folding Bailey frame according to claim 2, characterized in that, The sides of the profiles are all provided with waist-shaped through holes; Furthermore, in the folded state, the waist-shaped through holes on the profile overlap or partially overlap with each other, and the profile is fixed and locked by the first fastener passing through the waist-shaped through holes in sequence.

4. The folding Bailey frame according to claim 1 or 2, characterized in that, The first rotating component includes: two reinforcing plates respectively fixedly installed on the end faces of two adjacent profiles; a first hinge fixedly installed on one side of the two reinforcing plates by bolts or screws; a connecting plate disposed on the other side of the connection surface between one of the reinforcing plates and the first hinge; a first through hole located on the connecting plate and passing through the other side of the connection surface between one of the reinforcing plates and the first hinge; a pin disposed on the other side of the connection surface between the other reinforcing plate and the first hinge and cooperating with the first through hole; and a locking component disposed on the pin.

5. The folding Bailey frame according to claim 3, characterized in that, Multiple attachments are distributed on both sides of the square outer frame; Furthermore, in the folded state, the attachments on the square outer frame overlap or partially overlap each other, and the relative positions of the two outermost attachments of the rectangular frame are defined by the second fastener, thereby fixing and locking the rectangular frame.

6. The folding Bailey frame according to claim 1, characterized in that, The second rotating member is disposed on the upper part of the two rectangular frames on the adjacent sides, and the second rotating member includes: two hinges disposed between the connecting end faces of the two adjacent rectangular frames; The third rotating component is disposed at the lower part of the two rectangular frames on the adjacent sides. The third rotating component includes: a transition frame located between the two adjacent rectangular frames, and two hinges respectively disposed on both sides of the transition frame and between the connecting end faces of the two adjacent rectangular frames.

7. The folding Bailey frame according to claim 6, characterized in that, The width of the adapter frame is at least greater than the sum of the heights of the two pulleys.

8. The folding Bailey frame according to claim 1, characterized in that, The pulley includes: a mounting base disposed on the lower surface of the rectangular frame, a roller shaft rotatably mounted on the mounting base and slidably mounted on the profile, and limiting wing wheels disposed on both sides of the roller shaft.

9. The folding Bailey frame according to claim 8, characterized in that, The distance between the load-bearing bodies is equal to the axle width of the vehicle to be passed.

10. A folding method based on the foldable Bailey frame according to claim 5, characterized in that, include: Move the rectangular frames along the supporting body, and make the profiles move along the second and third rotating members, until all the rectangular frames are placed vertically on the same profile; The first fastener passes through the overlapping or partially overlapping waist-shaped through holes in sequence to fix and lock the profile. Then, by rotating the load-bearing body along the first rotating member, the sides of the two adjacent profiles are brought into contact with each other or separated by a predetermined gap. The second fastener defines the relative positions of the two outermost attachments of the rectangular frame, thereby fixing and locking the rectangular frame.

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