Prestressed assembled composite material emergency vehicle bridge

Abstract

The application discloses a prestressed assembled composite material emergency vehicle bridge. Modular bridge sections are prefabricated and assembled in a factory, single and double lug connecting pieces are used between the bridge sections, the bridge can be quickly assembled on site in the wild, the main girder of the bridge is made of composite materials, and the total weight of a single bridge section is very light. The arrangement mode of the folded prestressed cable can greatly reduce the space requirement of the prestressed cable system compared with the traditional V-shaped prestressed cable arrangement mode, improve the adaptability of the bridge to obstacles such as pits, and the cable arrangement mode is beneficial to the stress of the beam structure, can greatly improve the overall stiffness of the structure, reduce the bending moment in the middle of the bridge span, and improve the carrying capacity of the bridge. In addition, a single bridge section is transversely connected by a plurality of composite material square tube beams, the connection between the square tube end and the metal sleeve adopts a prestressed sleeve pipe tooth mode, the penetration hole in the end of the composite material pipe is avoided, and the connection reliability and connection efficiency are greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of emergency equipment technology, specifically a prestressed assembled composite material emergency vehicle bridge. Background Technology

[0002] The structural materials widely used in the development of modern emergency bridge equipment are mainly steel and aluminum alloys. Steel has advantages such as high strength, good plasticity and toughness, uniform stress distribution, high reliability, high elastic modulus, strong adaptability to dynamic loads, and mature design calculation theory. However, it also suffers from problems such as heavy weight, poor mobility, poor corrosion resistance, and high maintenance costs. In particular, its heavy weight causes a series of problems, such as the need for multiple transport vehicles and high tonnage vehicles, resulting in poor mobility, limited ability to overcome and cross obstacles, and high labor intensity during operation. Aluminum alloys have the advantages of high strength, light weight, and resistance to corrosion, greatly improving the reduction of equipment weight and the increase of mobility. However, they are expensive, have lower stiffness than steel, and the weldability of aluminum needs further improvement.

[0003] Therefore, composite materials have gradually been adopted for the main beam components of emergency bridges. However, due to the generally low elastic modulus of composite profiles, the overall structural stiffness is low, which cannot meet the requirements of heavy loads such as those carried by vehicles. Furthermore, the high strength advantage of composite materials has not been fully utilized. It is necessary to add certain structural measures to the existing structure to effectively reduce the bending moment at mid-span of the emergency bridge and improve the structural stiffness in terms of load transfer path angle. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a prestressed prefabricated composite material emergency vehicle bridge.

[0005] The technical solution to achieve the purpose of this invention is as follows: a prestressed prefabricated composite material emergency vehicle bridge, comprising several single-section modules assembled to form the main structure of the emergency vehicle bridge, and adjustable vertical struts and ropes located below the main structure of the emergency vehicle bridge. The ropes are arranged in a folded prestressed cable configuration. Each single-section module includes multiple parallel composite material square tube beams, with end connection nodes at both ends of the composite material square tube beams, and the beam ends are connected using pre-tensioned teeth. The end connection nodes between the composite material square tube beams are connected by transverse connecting pipes to form an integral structure. Connecting devices are respectively provided below both ends of several pairs of composite material square tube beams symmetrically arranged about the centerline along the length of the emergency vehicle bridge on each single-section module, and the connection devices are connected by connecting... The connecting device is used to connect the modules of the single bridge section. Each connection point is equipped with a transition node, and the transition nodes located on the same straight line along the length of the emergency vehicle bridge are called a group of transition nodes. The adjustable vertical strut is set perpendicular to the bridge deck, and its top is connected to all the transition nodes located in the middle of the emergency vehicle bridge along the width direction. Several ropes pass through the nodes set at the bottom of the adjustable vertical strut, and each rope passes through a group of transition nodes and is fixed to the outermost transition node. The number of ropes is the same as the number of groups of transition nodes. The two ends of the main structure of the emergency vehicle bridge are respectively installed on the supports through the support connectors. By adjusting the length of the adjustable vertical strut, the prestress of the rope is changed, thereby changing the camber of the bridge.

[0006] Furthermore, an aluminum alloy bridge panel is laid on the single bridge section module.

[0007] Furthermore, the ends of the composite square tube beam are toothed; the end connection node includes a U-shaped upper metal outer sleeve, a U-shaped lower metal outer sleeve, and a metal inner sleeve; the interior of both the U-shaped upper and lower metal outer sleeves is provided with protruding grooves that match the toothed ends of the composite square tube beam; the openings of the U-shaped upper and lower metal outer sleeves are assembled opposite each other on the upper and lower sides of the end of the composite square tube beam, and prestress is applied to the upper and lower surfaces of the composite square tube beam. After assembly, there is a gap between the bottom surfaces of the openings of the two U-shaped outer sleeves; a locking device is used to apply pre-tightening force between the two U-shaped outer sleeves to close the gap; the metal inner sleeve is inserted into the end of the composite square tube beam as a liner; the U-shaped lower metal outer sleeves of the two composite square tube beams are connected by the connecting device to achieve beam-to-beam connection, thereby realizing the connection between single bridge section modules.

[0008] Furthermore, the number, depth, and width of the teeth at the ends of the composite material square tube beam are customized according to the load-bearing capacity requirements.

[0009] Furthermore, the inner metal sleeve is provided with stiffening ribs.

[0010] Furthermore, the openings of the upper and lower U-shaped metal outer sleeves are provided with outwardly bent corner edges, and the locking device applies a pre-tightening force to the two U-shaped outer sleeves by applying a pre-tightening force to the corner edges.

[0011] Furthermore, stiffening ribs are provided between the bend edge and the upper or lower U-shaped metal outer sleeve.

[0012] Furthermore, the connecting device includes single / double ear connecting components disposed on the lower outer sleeve of the U-shaped metal.

[0013] Furthermore, the nodes at the bottom of the adjustable vertical support rod and the rope penetration areas in each transition node are all provided with smooth chamfers.

[0014] Furthermore, the support includes a base and a circular tube disposed on the base. The bottom ends of both ends of the main structure of the emergency vehicle bridge are provided with arc-shaped chamfers, and their inner diameter is the same as the outer diameter of the circular tube. The two are installed together and the arc-shaped chamfers can rotate along the surface of the circular tube.

[0015] Compared with the prior art, the significant advantages of this invention are:

[0016] (1) Modular bridge sections can be prefabricated and assembled in the factory. Single and double lugs are used between each bridge section, which can be quickly assembled on the spot in the field, making it more convenient.

[0017] (2) The main beam of the bridge is made of composite materials, and the total weight of a single bridge section is controlled within 180 kg, which can be handled by a small number of people, significantly reducing labor costs. Moreover, the structural damping of composite materials is much greater than that of steel, so it can also reduce the vibration of the bridge when equipment passes, thereby improving the smoothness, comfort and safety of vehicles traveling on the bridge.

[0018] (3) A folded prestressed cable arrangement is proposed, in which the prestressed cables at the end spans of the two bridge sections are arranged close to the bottom of the bridge sections, and the prestressed cables in the middle span converge at the transition node of the lower chord strut. Compared with the traditional "V" shaped prestressed cable arrangement, this arrangement can significantly reduce the space requirements of the prestressed cable system, improve the bridge's adaptability to obstacles such as potholes, and at the same time, this cable arrangement is effective in supporting the beam structure, which can significantly improve the overall stiffness of the bridge structure, reduce the mid-span bending moment, and improve the bridge's load-bearing capacity. In addition, this cable arrangement not only provides top support at the mid-span of the bridge but also has a tying effect at both ends of the bridge sections, which plays a beneficial role in the overall stress distribution of the bridge.

[0019] (4) The single modular bridge section is composed of multiple composite square tube beams connected laterally. The connection between the end of the square tube and the metal sleeve adopts the method of prestressed sleeve teeth. The shear resistance and surface friction of the composite material teeth are used to achieve efficient connection, avoiding through holes at the end of the composite material tube, which greatly improves the connection reliability and connection efficiency.

[0020] (5) Modular assembled bridges are easy to assemble, disassemble, transport and store, and are suitable for emergency rescue.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0022] Figure 1 Here are the overall three-view diagrams of a prestressed prefabricated composite material emergency bridge in one embodiment, wherein... Figure 1 (a) in the image is a bottom view. Figure 1 (b) is the main view. Figure 1 (c) in the figure is a side view.

[0023] Figure 2 This is a schematic diagram of the components of a prestressed assembled composite material emergency bridge in one embodiment.

[0024] Figure 3 This is a schematic diagram of a single bridge section structure in one embodiment.

[0025] Figure 4 This is a schematic diagram of the support structure in one embodiment.

[0026] Figure 5 This is a schematic diagram of the components of the composite material square tube "beam-beam" end connection node in one embodiment, wherein... Figure 5 (a) in the diagram is a component diagram of the connecting node. Figure 5 (b) in the diagram is the assembly diagram of the connection node.

[0027] Figure 6 This is a schematic diagram of the assembled components of a node in one embodiment, wherein... Figure 6 (a) in the diagram is a schematic diagram of a composite square tube beam with teeth at the ends. Figure 6 (b) in the diagram is a schematic diagram of a U-shaped outer sleeve. Figure 6 (c) in the diagram is a schematic diagram of the metal inner sleeve. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0029] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0030] In one embodiment, combined Figure 1 and Figure 2 This invention provides a prestressed prefabricated composite material emergency vehicle bridge, comprising several single-section modules 1 assembled into the main structure of the emergency vehicle bridge, and adjustable vertical struts 3, ropes 4, and supports 5 located below the main structure of the emergency vehicle bridge; combined with Figure 3 The single-bridge module 1 includes multiple parallel composite square tube beams 11. Each composite square tube beam 11 has end connection nodes 12 at both ends, and the connection is achieved using pre-tensioned teeth at the beam ends. The end connection nodes 12 between the composite square tube beams 11 are connected by transverse connecting pipes 13, forming an integrated structure. Connecting devices 2 are respectively installed below both ends of several pairs of composite square tube beams 11 symmetrically arranged along the centerline of the emergency vehicle bridge length direction on the single-bridge module 1. The connection between the single-bridge modules is achieved through the cooperation of the connecting devices 2. Each connection point has a transition node, and the connection is made along the length direction of the emergency vehicle bridge. The transition nodes located on the same straight line are referred to as a group of transition nodes; the adjustable vertical strut 3 is set perpendicular to the bridge deck, and its top is connected to all the transition nodes located in the middle of the emergency vehicle bridge along the width direction of the emergency vehicle bridge; several ropes pass through the nodes 6 set at the bottom of the adjustable vertical strut, and each of them passes through a group of transition nodes and is fixed to the outermost transition node; the number of ropes 4 is the same as the number of groups of transition nodes; the two ends of the main structure of the emergency vehicle bridge are respectively installed on the support 5 through the support connectors; by adjusting the length of the adjustable vertical strut 3, the prestress of the ropes 4 is changed, thereby changing the camber of the bridge.

[0031] Here, the single bridge section module 1 is the main load-bearing component of the bridge, and the required number can be configured according to the required length of the bridge.

[0032] Here, a pre-tightening toothed connection at the beam end is used to ensure that the metal sleeve at the beam end can reliably transmit axial force and bending moment.

[0033] Here, the transverse connecting pipe 13 is connected by, but not limited to, welding.

[0034] Here, the method of adjusting and locking the adjustable vertical support rod length is not limited.

[0035] Furthermore, in one embodiment, an aluminum alloy bridge panel is laid on the single bridge section module.

[0036] Furthermore, in one embodiment, the connecting device includes, but is not limited to, single / double ear connecting components disposed on the lower outer sleeve of the U-shaped metal.

[0037] Based on the above embodiments, preferably, the single-bridge section module 1 includes five parallel composite square tube beams 11, with double-ear connections 14 and single-ear connections 15 welded to the second and fourth beams. It should be noted that the middle bridge section has single-ear and double-ear connections on both sides, while the side bridge sections have support connectors and single / double-ear connections. The main structure of the emergency vehicle bridge includes four single-bridge section modules spliced ​​along the bridge length. Each single / double-ear connection component between the single-bridge section modules and at each bridge end has a node. From the middle of the bridge to both ends, the nodes are respectively designated as the center node, the middle bridge section cable transition node 7, and the end bridge section cable transition node 8. The adjustable vertical support includes an adjustable telescopic vertical rod and two branch rods located at the top of the main rod. The three rods form a Y-shaped structure, and the other ends of the two branch rods are respectively fixed to a pair of center nodes. The bridge is constructed using two ropes. One rope passes through node 6 at the bottom of the vertical member, and its two ends pass sequentially through the transition nodes 7 and 8 of the middle and end bridge sections on the second composite material square tube beam, respectively, and is fixedly connected to the end bridge section transition node 8. The other rope passes through node 6 at the bottom of the vertical member, and its two ends pass sequentially through the transition nodes 7 and 8 of the middle and end bridge sections on the fourth composite material square tube beam, respectively, and is fixedly connected to the end bridge section transition node 8. Adjusting the length of the vertical member and applying prestress to the cables causes a slight camber in the bridge. During bridge dismantling, the prestress is released, the vertical members and prestressed cables are removed, and then the bridge sections are dismantled. Due to the small number of components and procedures at each connection point, rapid dismantling and assembly can be achieved.

[0038] Here, depending on actual needs, emergency vehicle bridges of different widths can be constructed in the manner described in the example above.

[0039] Furthermore, in one embodiment, combined with Figure 4 The support includes a base and a circular tube set on the base. The bottom of both ends of the main structure of the emergency vehicle bridge is provided with an arc-shaped incision, and its inner diameter is the same as the outer diameter of the circular tube. The two are installed together and the arc-shaped incision can rotate along the surface of the circular tube.

[0040] The scheme in this embodiment can achieve rapid beam placement, and the support can easily achieve non-large rotation of the end of the side bridge section beam after bearing the load.

[0041] More preferably, in one embodiment, the nodes at the bottom of the adjustable vertical support rod and the rope penetration areas in each transition node are provided with smooth chamfers.

[0042] The solution in this embodiment can ensure smooth rope movement.

[0043] Furthermore, in one embodiment, combined with Figure 5 and Figure 6 The composite material square tube beam 11 has teeth at its ends; the end connection node 12 includes a U-shaped upper metal outer sleeve 21, a U-shaped lower metal outer sleeve 31, and a metal inner sleeve 41; the interior of the U-shaped upper metal outer sleeve 21 and the U-shaped lower metal outer sleeve 31 is provided with protruding grooves that match the teeth at the ends of the composite material square tube beam; the U-shaped upper metal outer sleeve 21 and the U-shaped lower metal outer sleeve 31 are assembled with their openings facing each other on the upper and lower sides of the ends of the composite material square tube beam 11, and prestress is applied to the upper and lower surfaces of the composite material square tube beam. After assembly, there is a gap between the bottom surfaces of the openings of the two U-shaped outer sleeves; a locking device is used to apply pre-tightening force between the two U-shaped outer sleeves to close the gap; the metal inner sleeve 41 is inserted into the end of the composite material square tube beam 11 as an inner liner; the U-shaped lower metal outer sleeves 31 of the two composite material square tube beams are connected by the connecting device to achieve beam-beam connection, thereby realizing the connection between single bridge section modules.

[0044] Here, the composite material square tube beam 11 is the main connecting component. Its cross-sectional shape can be rectangular, square, etc., and the wall thickness of the tube can vary along its perimeter. Multiple slots can be opened at the ends according to load-bearing requirements. Since there is no stress near the neutral layer of the beam during bending, no slots are provided in the middle region of the beam web. Figure 6 As shown in (a).

[0045] Here, the metal inner sleeve 41 is the inner lining of the end of the composite material square tube, which prevents the tube wall from concave deformation during the application of pre-tightening force and increases the rigidity of the square tube wall.

[0046] Here, the number, depth, and width of the teeth at the end of the composite material square tube beam 11 are customized according to the load-bearing capacity requirements.

[0047] This is not limited to the U-shaped outer tube structure mentioned above; the structure can be optimized according to the shape of the composite square tube.

[0048] This is not limited to the above-mentioned toothed or raised groove installation method; other prestressed assembly methods are also acceptable.

[0049] Preferably, a gap of 6mm-10mm should be maintained between the bottom surfaces of the openings of the two U-shaped outer tubes.

[0050] Furthermore, in one embodiment, the openings of the U-shaped upper metal outer sleeve 21 and the U-shaped lower metal outer sleeve 31 are provided with outwardly bent corner edges, and the locking device applies prestress to the two U-shaped outer sleeves by applying pre-tightening force to the corner edges.

[0051] Furthermore, in one embodiment, the inner metal sleeve 41 is provided with stiffening ribs, such as... Figure 6 As shown in (c), a stiffening rib is provided between the bend edge and the upper U-shaped metal outer sleeve 21 or the lower U-shaped metal outer sleeve 31, such as... Figure 6 As shown in (b).

[0052] The solution in this embodiment can increase the rigidity of local surfaces of the inner and outer jacket connectors.

[0053] Furthermore, in one embodiment, the inner metal sleeve 41 is provided with a jack for support.

[0054] The solution in this embodiment can increase the friction between the end surface of the composite material and the inner wall of the metal outer sleeve.

[0055] Furthermore, in one embodiment, the locking device includes, but is not limited to, several sets of bolt groups 51, or other devices that can apply prestress to the surface of the square tube.

[0056] Furthermore, in one embodiment, a fit tolerance of 0.3 mm to 0.5 mm is provided between the outer surface of the metal inner sleeve 41 and the inner surface of the composite material square tube beam 11.

[0057] The manufacturing process of the emergency vehicle bridge of this invention is described in detail below:

[0058] 1. Single-section module: Based on the required length of the single-section, cut the required length of composite square tube beams and serrate the ends of the tubes. Different depths, widths, and numbers of teeth can be made according to the load-bearing capacity requirements. The outer surface of the metal inner sleeve fits against the inner surface of the composite tube, with a 0.3mm-0.5mm fit tolerance between the inner and outer surfaces, allowing the inner sleeve to exert a certain amount of pressure on the composite tube after insertion. The metal outer sleeve adopts two symmetrical designs, with internal teeth fitting against the toothed grooves at the ends of the composite square tubes. A certain gap is left after the upper and lower outer sleeves are spliced. Applying torque to the high-strength bolts generates internal tensile force, causing the upper and lower metal outer sleeves to move closer together, thereby generating prestress on the upper and lower surfaces of the composite tube ends. Prepare an assembly mold, place five composite square tubes with end nodes on the mold, achieving equal spacing. Weld the transverse connecting square tubes at the ends, weld the single and double ear connecting nodes at both ends, and finally use structural adhesive to bond the aluminum alloy bridge deck to the upper surface of the composite beam, with flanges on both sides. Longitudinally, bolts are used to connect it to the transverse connecting tubes.

[0059] 2. Prestressed System: "Y"-shaped adjustable vertical struts are fabricated using welding. Turnbuckles are installed in the middle to allow for length adjustment. Prestressed cable transition nodes are located at the bottom, with smooth chamfers in the cable penetration areas of these nodes to ensure smooth cable movement. The same process is used to install transition nodes at the middle and end bridge sections, with smooth chamfers in the cable penetration areas of these transition nodes.

[0060] 3. The end of the side bridge section is provided with an arc-shaped chamfer, the inner diameter of which is the same as the outer diameter of the bearing tube. The arc-shaped chamfer allows for easy rotation on the surface of the bearing tube, such as... Figure 4 As shown, this allows for rapid placement of the beam, and the supports facilitate minimal rotation of the end of the side bridge section beam after it has been loaded.

[0061] In summary, the modular, assembled bridge of this invention is easy to assemble, disassemble, transport, and store, making it suitable for emergency rescue applications. The folded prestressed cable arrangement, compared to the traditional "V"-shaped arrangement, significantly reduces the space requirements of the prestressed cable system, improves the bridge's adaptability to obstacles such as potholes, and provides strong support for the beam structure, greatly enhancing overall structural stiffness, reducing mid-span bending moment, and increasing the bridge's load-bearing capacity. Each bridge section is composed of several composite material square tubes. The ends of the square tubes are toothed, and steel inner and outer sleeves are installed. The outer sleeves are divided into upper and lower pairs that mesh with the teeth at the ends of the square tubes. High-strength bolts connect the upper and lower outer sleeves, achieving compression between the outer sleeve teeth and the square tube end teeth. Utilizing the shear resistance and surface friction of the composite material teeth, an efficient connection is achieved. Unlike traditional bolt connections that can cause through-and-through damage to the composite material tubes, this connection method maximizes the strength of the composite material.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention without departing from its spirit and scope should be included within the protection scope of the present invention.

Claims

1. A prestressed assembled composite emergency vehicle deck bridge, characterized in that, The single bridge module includes a plurality of parallel composite square tube beams, both ends of the composite square tube beam are provided with end connection nodes, and the end pre-tightening force tooth connection mode is adopted; the end connection nodes between the composite square tube beams are connected through transverse connecting pipes to form an integrated structure; a plurality of pairs of composite square tube beams symmetrically arranged along the center line of the emergency vehicle bridge in the length direction of the emergency vehicle bridge are respectively provided with connecting devices below both ends of the composite square tube beams, and the connection between the single bridge modules is realized through the cooperation of the connecting devices; a transition node is arranged at each connecting point, and the transition nodes located on the same straight line in the length direction of the emergency vehicle bridge are recorded as a group of transition nodes; the adjustable vertical support rod is arranged vertically to the bridge deck, and the top of the adjustable vertical support rod is connected with all the transition nodes located in the middle of the emergency vehicle bridge in the width direction of the emergency vehicle bridge; a plurality of the ropes pass through the nodes arranged at the bottom of the adjustable vertical support rod, and are respectively connected with a group of transition nodes and the outermost transition node; the number of the ropes is the same as the number of the groups of transition nodes; the both ends of the emergency vehicle bridge main structure are respectively installed on the support through the support connecting piece; the pre-stress of the rope is changed by adjusting the length of the adjustable vertical support rod, so as to change the camber of the bridge; The end of the composite square tube beam is toothed; the end connection node includes a U-shaped metal upper outer sleeve pipe, a U-shaped metal lower outer sleeve pipe and a metal inner sleeve pipe; the inside of the U-shaped metal upper outer sleeve pipe and the U-shaped metal lower outer sleeve pipe is provided with a protruding notch matched with the toothed end of the composite square tube beam; the U-shaped metal upper outer sleeve pipe and the U-shaped metal lower outer sleeve pipe are assembled on the upper and lower sides of the toothed end of the composite square tube beam, and pre-stress is applied to the upper and lower surfaces of the composite square tube beam; a gap exists between the bottom surfaces of the two U-shaped outer sleeve pipes after assembly; the pre-tightening force is applied to the two U-shaped outer sleeve pipes through the locking device to realize the closure of the gap; the metal inner sleeve pipe is inserted into the end of the composite square tube beam as an inner lining; the U-shaped metal lower outer sleeve pipes of the two composite square tube beams are connected through the connecting device to realize beam-beam connection, and then the connection between the single bridge modules is realized; The support includes a base and a circular pipe arranged on the base, and the bottom of the both ends of the emergency vehicle bridge main structure is provided with an arc-shaped pouring opening, and the inner diameter of the arc-shaped pouring opening is the same as the outer diameter of the circular pipe; the arc-shaped pouring opening and the circular pipe are cooperatively installed, and the arc-shaped pouring opening can rotate along the surface of the circular pipe.

2. The prestressed composite emergency vehicle bridge of claim 1, wherein, The aluminum alloy bridge deck is laid on the single bridge module.

3. The prestressed composite emergency vehicle bridge of claim 1, wherein, The number, depth and width of the toothed end of the composite square tube beam are self-defined according to the bearing capacity requirement.

4. The pre-stressed assembled composite emergency vehicle bridge according to claim 1, characterized in that, The metal inner sleeve pipe is provided with a stiffening rib inside.

5. The pre-stressed assembled composite emergency vehicle bridge according to claim 1, wherein, The opening of the U-shaped metal upper outer sleeve pipe and the U-shaped metal lower outer sleeve pipe is provided with an outwardly bent corner edge, and the locking device applies pre-tightening force to the two U-shaped outer sleeve pipes by applying pre-tightening force to the corner edge.

6. The prestressed composite emergency vehicle bridge of claim 5, wherein, The reinforcing ribs are arranged between the folded corner edge and the U-shaped metal upper outer sleeve or the U-shaped metal lower outer sleeve.

7. The pre-stressed assembled composite emergency vehicle bridge according to claim 1, wherein, The connecting device comprises a single / double ear connecting part arranged on the U-shaped metal lower outer sleeve.

8. The pre-stressed assembled composite emergency vehicle bridge according to claim 1, characterized in that, Smooth chamfers are arranged in the node of the adjustable vertical support rod bottom and the rope penetration area of each transition node.

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