CN116856258A - Prestressed assembled composite material emergency vehicle bridge - Google Patents

Abstract

The application discloses a prestressed assembled composite material emergency vehicle bridge. The modular bridge sections are prefabricated and assembled in a factory, the single-double-lug connecting pieces are adopted among the bridge sections, the bridge girder can be assembled rapidly in the field, the bridge girder is made of composite materials, and the total weight of the single bridge section is very light. Compared with the traditional V-shaped prestressed cable arrangement mode, the arrangement mode of the folded prestressed cable can greatly reduce the space requirement of a prestressed cable system, improve the adaptability of a bridge to obstacles such as pits and the like, and meanwhile, the cable arrangement mode is strong in stress on a beam structure, can greatly improve the integral rigidity of the structure, reduce the mid-span bending moment of the bridge and improve the bearing capacity of the bridge. In addition, the single bridge section is formed by transversely connecting a plurality of composite square tube beams, the connection of the square tube ends and the metal sleeve adopts a prestress sleeve tooth mode, through holes on the composite tube ends are avoided, and connection reliability and connection efficiency are greatly improved.

Description

Prestressed assembled composite material emergency vehicle bridge

Technical Field

The application belongs to the technical field of emergency equipment, and particularly relates to a prestressed assembled composite material emergency vehicle bridge.

Background

The structural materials widely used in the development of modern emergency bridge equipment are mainly steel and aluminum alloy. The steel has the advantages of high strength, good plasticity and toughness, uniform stress in all directions, high reliability, high elastic modulus, strong adaptability to dynamic load, mature design and calculation theory and the like, but has the problems of large weight, poor maneuverability, poor corrosion resistance, high maintenance cost and the like. Particularly, due to the fact that a series of problems are caused by large weight, such as a large number of transport vehicles and high tonnage of a load-carrying vehicle, the defects of poor maneuverability, small potential for overcoming and crossing obstacles, high operation labor intensity and the like are caused. The aluminum alloy has the advantages of high strength, light weight and difficult corrosion, greatly improves the weight of equipment and increases the maneuverability, but has high manufacturing cost and lower rigidity than steel, and the welding performance of the aluminum material needs to be improved.

Therefore, the main beam component of the emergency bridge gradually starts to adopt the composite material, however, the general elastic modulus of the composite material profile is lower, so that the rigidity of the whole structure is lower, the requirement of heavy loads such as a vehicle and the like cannot be met, and the advantage of high strength of the composite material is not fully utilized. On the basis of the existing structure, certain constructional measures are added, so that the bending moment in the bridge span is effectively reduced, and the structural rigidity is improved on the aspect of the load transmission path.

Disclosure of Invention

The application aims to solve the problems in the prior art and provides a prestressed assembled composite material emergency vehicle bridge.

The technical solution for realizing the purpose of the application is as follows: the prestress assembled composite material emergency vehicle bridge comprises a plurality of single bridge section modules spliced into an emergency vehicle bridge main body structure, and an adjustable vertical stay bar and a rope which are positioned below the emergency vehicle bridge main body structure, wherein the rope adopts a folded prestress rope arrangement mode; the Shan Qiaojie module comprises a plurality of composite square tube beams which are arranged in parallel, wherein two ends of each composite square tube beam are provided with end connection nodes, and a beam end pretightening force tooth connection mode is adopted; the end connection nodes between the composite square pipe beams are connected through transverse connection pipes to form an integrated structure; connecting devices are respectively arranged below two ends of a plurality of pairs of composite square tube beams which are symmetrical with each other along the central line of the length direction of the emergency bridge on the Shan Qiaojie module, the single bridge section modules are connected through the matching installation of the connecting devices, each connecting point is provided with a transition node, and the transition nodes which are positioned on the same straight line along the length direction of the emergency bridge are recorded as a group of transition nodes; the adjustable vertical stay bars are perpendicular to the bridge deck, the tops of the adjustable vertical stay bars are connected with all transition nodes located in the middle of the emergency vehicle bridge along the width direction of the emergency vehicle bridge, a plurality of ropes penetrate through the nodes arranged at the bottoms of the adjustable vertical stay bars, and respectively penetrate through a group of transition nodes and are fixedly connected with the transition nodes at the outermost side, and the number of the ropes is the same as the number of the transition nodes; two ends of the main body structure of the emergency vehicle bridge are respectively arranged on the support through support connecting pieces; the prestress of the rope is changed by adjusting the length of the adjustable vertical stay bar, so that the camber of the bridge is changed.

Further, an aluminum alloy bridge deck is laid on the Shan Qiaojie module.

Further, the end part of the composite square tube beam is provided with teeth; the end connection node comprises a U-shaped metal upper outer sleeve, a U-shaped metal lower outer sleeve and a metal inner sleeve; the U-shaped metal upper outer sleeve and the U-shaped metal lower outer sleeve are respectively provided with a convex notch matched with the open tooth at the end part of the composite square tubular beam; the U-shaped metal upper outer sleeve and the U-shaped metal lower outer sleeve openings are oppositely assembled on the upper side and the lower side of the end part of the composite square tube beam, prestress is applied to the upper surface and the lower surface of the composite square tube beam, and a gap exists between the bottoms of the two U-shaped outer sleeve openings after the assembly; the two U-shaped outer sleeves exert pretightening force through a locking device, so that the gap is closed; the metal inner sleeve is inserted into the end part of the composite square tubular beam to be used as a lining; the U-shaped metal lower outer sleeves of the two composite square tube beams are connected through the connecting device to realize beam-beam connection, so that connection between the single-bridge-section modules is realized.

Further, the number, depth and width of the composite square tubular beam end teeth are set in a self-defined mode according to the bearing capacity requirement.

Further, stiffening ribs are arranged in the metal inner sleeve.

Further, the opening parts of the outer sleeve at the upper part of the U-shaped metal and the outer sleeve at the lower part of the U-shaped metal are provided with outwards bent angle edges, and the locking device applies pretightening force to the two U-shaped outer sleeves by applying pretightening force to the angle edges.

Further, stiffening ribs are arranged between the folded angle edges and the U-shaped metal upper outer sleeve or the U-shaped metal lower outer sleeve.

Further, the connection device comprises a single/double ear connection part arranged on the U-shaped metal lower outer sleeve.

Further, smooth chamfers are arranged at the nodes at the bottom of the adjustable vertical stay bar and in rope penetrating areas in all transition nodes.

Further, the support includes the base and sets up the pipe on the base, emergency car bridge body structure's both ends bottom sets up convex pouring opening, and its internal diameter is the same with the external diameter of pipe, and both cooperation installations and arc pouring opening can follow the pipe surface rotation.

Compared with the prior art, the application has the remarkable advantages that:

(1) The modularized bridge joints can be prefabricated and assembled in a factory, and connectors such as single and double ears are adopted among the bridge joints, so that the bridge joints can be assembled rapidly in the field, and the bridge joints are more convenient and faster.

(2) The bridge girder is prepared from a composite material, the total weight of a single bridge joint is controlled within 180kg, and the bridge girder can be carried by a small number of people, so that the labor cost is obviously reduced. And the structural damping of the composite material is far greater than that of steel, so that the vibration of the bridge when equipment passes through can be reduced, and the stability, comfort and safety of travelling on the bridge are improved.

(3) The arrangement mode of the folded prestressed cables is provided, the two bridge joint end span prestressed cables are arranged at the bottom of the close bridge joint, the middle bridge span prestressed cables are intersected at the transition node of the lower chord stay bar, compared with the traditional V-shaped prestressed cable arrangement mode, the space requirement of a prestressed cable system can be greatly reduced, the adaptability of a bridge to obstacles such as pits and the like is improved, meanwhile, the cable arrangement direction is strong to the stress of a beam structure, the integral rigidity of the bridge structure can be greatly improved, the bending moment in the bridge span is reduced, and the bearing capacity of the bridge is improved. Meanwhile, the cable laying mode not only realizes the shoring in the bridge span, but also has the drawknot function at the bridge joints at the two ends, thereby playing a beneficial role in the stress of the whole bridge.

(4) The single-modularization bridge joint is formed by transversely connecting a plurality of composite material square tube beams, the connection of the square tube ends and the metal sleeve adopts a prestress sleeve tooth mode, and the high-efficiency connection is realized by utilizing the shearing resistance and the surface friction force of the composite material teeth, so that the penetrating holes on the composite material tube ends are avoided, and the connection reliability and the connection efficiency are greatly improved.

(5) The modularized assembled bridge is convenient to disassemble and assemble, convenient to transport and store, and suitable for emergency rescue.

The application is described in further detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a three general views of a prestressed assembled composite emergency bridge according to an embodiment, in which (a) in fig. 1 is a bottom view, (b) in fig. 1 is a front view, and (c) in fig. 1 is a side view.

FIG. 2 is a schematic illustration of the composition of a prestressed assembled composite emergency bridge member in one embodiment.

FIG. 3 is a schematic diagram of a single bridge configuration in one embodiment.

Fig. 4 is a schematic view of a stand configuration in one embodiment.

Fig. 5 is a schematic view of the composition of a composite square tube beam-beam end connection node part in one embodiment, wherein (a) in fig. 5 is a connection node part composition diagram, and (b) in fig. 5 is a connection node assembly diagram.

Fig. 6 is a schematic view of each assembly part of a node in an embodiment, wherein (a) in fig. 6 is a schematic view of a square tubular beam of composite material with an end tooth, (b) in fig. 6 is a schematic view of a U-shaped outer sleeve, and (c) in fig. 6 is a schematic view of a metal inner sleeve.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present application, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In one embodiment, with reference to fig. 1 and 2, a prestressed assembled composite emergency vehicle bridge is provided, which comprises a plurality of single-bridge joint modules 1 spliced into an emergency vehicle bridge main body structure, and an adjustable vertical stay bar 3, a rope 4 and a support 5 which are positioned below the emergency vehicle bridge main body structure; referring to fig. 3, the Shan Qiaojie module 1 includes a plurality of composite square tube beams 11 disposed in parallel, wherein two ends of the composite square tube beams 11 are provided with end connection nodes 12, and a beam end pretightening force tooth connection mode is adopted; the end connection nodes 12 between the composite square pipe beams 11 are connected through transverse connection pipes 13 to form an integrated structure; connecting devices 2 are respectively arranged below two ends of a plurality of pairs of composite square tube beams 11 which are symmetrical with each other along the central line of the length direction of the emergency vehicle bridge on the Shan Qiaojie module 1, the single bridge section modules are connected through the matching installation of the connecting devices 2, each connecting point is provided with a transition node, and the transition nodes which are positioned on the same straight line along the length direction of the emergency vehicle bridge are recorded as a group of transition nodes; the adjustable vertical stay bar 3 is arranged perpendicular to the bridge deck, the top of the adjustable vertical stay bar is connected with all transition nodes along the width direction of the emergency vehicle bridge and positioned in the middle of the emergency vehicle bridge, a plurality of ropes penetrate through nodes 6 arranged at the bottom of the adjustable vertical stay bar, and respectively penetrate through a group of transition nodes and are fixedly connected with the outermost transition nodes, and the number of the ropes 4 is the same as the number of the transition nodes; two ends of the main body structure of the emergency vehicle bridge are respectively arranged on the support 5 through support connecting pieces; the prestress of the ropes 4 is changed by adjusting the length of the adjustable vertical stay bar 3, thereby changing the camber of the bridge.

Here, the single bridge joint module 1 is a main bearing member of the bridge, and the required number can be configured according to the required length of the bridge.

Here, the mode of beam end pretightening force tooth connection is adopted, so that the reliable transmission of axial force and bending moment of the beam end metal sleeve is ensured.

Here, the transverse connection pipe 13 is, but not limited to, welded.

Here, the manner in which the length of the adjustable vertical stay is adjusted and locked is not limited.

Further, in one embodiment, the Shan Qiaojie module has an aluminum alloy deck plate applied thereto.

Further, in one of the embodiments, the connection means includes, but is not limited to, a single/double ear connection member disposed on the U-shaped metal lower outer sleeve.

Based on the above embodiment, the Shan Qiaojie module 1 preferably includes five parallel composite square tube beams 11, and two ear connections 14 and one ear connection 15 are welded on the second and fourth beams, and it should be noted that the two sides of the intermediate bridge are respectively one ear and two ears, and the two side bridge are respectively a support connector and one/two ears. The emergency vehicle bridge main body structure comprises four single bridge section modules spliced along the length direction of a bridge body, each single/double-lug connecting component between the single bridge section modules and at the bridge end is provided with a node, the directions from the middle part of the bridge to the two ends are respectively marked as a central node, and a middle bridge section cable transition node 7 and an end bridge section cable transition node 8. The adjustable vertical stay bar comprises an adjustable telescopic vertical rod and two branch bars positioned at the top of the main rod, wherein the three bars form a Y-shaped structure, and the other ends of the two branch bars are respectively fixedly connected to a pair of central nodes. The number of ropes is 2, wherein one rope passes through a node 6 at the bottom of the vertical rod, two ends of the rope respectively pass through a middle bridge cable transition node 7 and an end bridge cable transition node 8 on the second composite square tubular beam in sequence and are fixedly connected with the end bridge cable transition node 8, and the other rope passes through a node 6 at the bottom of the vertical rod, two ends of the rope respectively pass through a middle bridge cable transition node 7 and an end bridge cable transition node 8 on the fourth composite square tubular beam in sequence and are fixedly connected with the end bridge cable transition node 8. And the length of the vertical rod is adjusted, and the prestress in the cable is applied, so that the bridge is slightly inverted. When the bridge is disassembled, the vertical rods and the prestressed cables are disassembled according to the relaxation prestress, and then the bridge joint is disassembled, so that the quick assembly and disassembly can be realized due to fewer parts and fewer working procedures at each joint.

Here, according to actual demands, emergency bridges of different widths may be constructed in the above-described exemplary manner.

Further, in one embodiment, referring to fig. 4, the support includes a base and a round tube disposed on the base, the bottoms of two ends of the main body structure of the emergency vehicle bridge are provided with arc-shaped pouring openings, the inner diameter of the arc-shaped pouring openings is the same as the outer diameter of the round tube, and the arc-shaped pouring openings are installed in a matched manner and can rotate along the surface of the round tube.

By adopting the scheme of the embodiment, the falling beam can be quickly in place, and the bearing is easy to realize the non-large rotation of the end part of the bridge section beam after bearing.

Further preferably, in one of the embodiments, the joints at the bottom of the adjustable vertical stay and the rope penetration area in each transition joint are provided with smooth chamfers.

By adopting the scheme of the embodiment, the smooth movement of the rope can be ensured.

Further, in one embodiment, with reference to fig. 5 and 6, the end of the composite square tubular beam 11 is toothed; the end connection node 12 comprises a U-shaped metal upper outer sleeve 21, a U-shaped metal lower outer sleeve 31 and a metal inner sleeve 41; the U-shaped metal upper outer sleeve 21 and the U-shaped metal lower outer sleeve 31 are respectively provided with a convex notch matched with the open teeth at the end part of the composite square tube beam; the openings of the U-shaped metal upper outer sleeve 21 and the U-shaped metal lower outer sleeve 31 are oppositely assembled on the upper side and the lower side of the end part of the composite square tube beam 11, prestress is applied to the upper surface and the lower surface of the composite square tube beam, and a gap exists between the bottoms of the openings of the two U-shaped outer sleeves after the assembly; the two U-shaped outer sleeves exert pretightening force through a locking device, so that the gap is closed; the metal inner sleeve 41 is inserted into the end part of the composite square tubular beam 11 to be used as a lining; the U-shaped metal lower outer sleeves 31 of the two-by-two composite square tube beams are connected through the connecting device to realize beam-to-beam connection, so that connection between the single-bridge-section modules is realized.

Here, the composite square tube beam 11 is a connecting body member, the cross-sectional form of which may be rectangular, square, etc., the wall thickness along the peripheral tube may be variable, and the end portion may be provided with a plurality of notches according to the load-bearing requirement, and since the beam neutral layer is not stressed during the bending process, the central region of the web is not provided with notches, as shown in fig. 6 (a).

Here, the metal inner sleeve 41 is a lining of the end of the square tube made of composite material, prevents the concave deformation of the tube wall in the pretightening force applying process, and increases the rigidity of the square tube wall.

Here, the number, depth and width of the open teeth at the end of the square composite tubular beam 11 are set in a self-defined manner according to the bearing capacity requirement.

Here, the structure is not limited to the above-mentioned U-shaped outer sleeve structure, and the structure may be optimally designed according to the shape of the composite square tube.

Here, the mounting method is not limited to the above-mentioned mounting method of the tooth and the protruding notch, and other mounting methods for applying the prestress may be used.

Preferably, a gap of 6mm-10mm is ensured between the bottom surfaces of the openings of the two U-shaped outer sleeves.

Further, in one embodiment, the openings of the U-shaped metal upper outer sleeve 21 and the U-shaped metal lower outer sleeve 31 are provided with folded corner edges that are bent outwards, and the locking device applies prestress to the two U-shaped outer sleeves by applying a pretightening force to the folded corner edges.

Further, in one embodiment, the metal inner sleeve 41 is internally provided with stiffening ribs as shown in fig. 6 (c), while the folded corner edges are provided with stiffening ribs between the U-shaped metal upper outer sleeve 21 or the U-shaped metal lower outer sleeve 31 as shown in fig. 6 (b).

By adopting the scheme of the embodiment, the rigidity of the local surface of the connecting piece of the inner sleeve and the outer sleeve can be increased.

Further, in one embodiment, a jack for jacking is provided inside the metal inner tube 41.

By adopting the scheme of the embodiment, the friction force between the surface of the end part of the composite material and the inner wall of the metal outer sleeve can be increased.

Further, in one embodiment, the locking device includes, but is not limited to, a plurality of bolt sets 51, and other devices capable of applying prestress on the surface of the square tube may be used.

Further, in one embodiment, a tolerance of 0.3mm to 0.5mm is provided between the outer surface of the metal inner sleeve 41 and the inner surface of the composite square tubular beam 11.

The following specifically describes the manufacturing process of the emergency vehicle bridge:

1. single bridge segment module: according to the length requirement of the single bridge joint, cutting the square composite pipe beam with the required length, and tooth cutting the end part of the pipe, the teeth with different depths, widths and numbers can be formed according to the bearing capacity requirement. The outer surface of the metal inner sleeve is attached to the inner surface of the composite material pipe, and the inner surface and the outer surface are provided with a fit tolerance of 0.3mm-0.5mm, so that the inner sleeve is inserted to form certain extrusion on the composite material pipe. The metal jacket adopts two symmetrical forms, the inside sets up tooth and the laminating of combined material side's pipe tip tooth groove, reserves certain clearance after upper and lower two jackets splice. And torque is applied to the high-strength bolt to generate internal tension, so that the upper metal jacket and the lower metal jacket are close to each other, and prestress of the upper surface and the lower surface of the end part of the composite material pipe is generated. Preparing an assembling die, placing 5 composite square tubes with end joints on the die, realizing equidistant arrangement, welding end transverse connection square tubes, welding single and double lug connection joints at two ends, finally bonding an aluminum alloy bridge deck on the upper surface of the composite beam by adopting structural adhesive, flanging at two sides, and longitudinally connecting the aluminum alloy bridge deck on the transverse connection tubes by adopting bolts.

2. Prestress system: the Y-shaped adjustable vertical stay bar is prepared by adopting a welding process, the middle part is provided with a basket bolt to realize adjustable length, the bottom part is provided with a prestressed cable transition node, and a smooth chamfer is arranged in a cable penetrating area in the node to ensure smooth movement of the cable. By adopting the same process, transition nodes are arranged at the middle bridge joint and the end bridge joint, and smooth chamfers are arranged in the middle cable penetration areas of the transition nodes.

3. Bian Qiaojie the tip sets up the convex inverted mouth, and its internal diameter is the same with the external diameter of support pipe, and the convenient rotation of arc inverted mouth at support pipe surface is shown as fig. 4, can realize falling the roof beam from this and put in place fast, and the support department easily realizes the bridge festival roof beam tip after bearing and does not rotate greatly.

In conclusion, the modularized assembled bridge is convenient to disassemble and assemble, convenient to transport and convenient to store, and is suitable for emergency rescue. Compared with the traditional V-shaped prestressed cable arrangement mode, the arrangement mode of the folded prestressed cable can greatly reduce the space requirement of a prestressed cable system, improve the adaptability of a bridge to obstacles such as pits and the like, and meanwhile, the cable arrangement mode is powerful in stress on a beam structure, can greatly improve the integral rigidity of the structure, reduce the mid-span bending moment of the bridge and improve the bearing capacity of the bridge. The single bridge joint is formed by assembling a plurality of composite material square tubes, the end parts of the square tubes are provided with teeth, an inner sleeve and an outer sleeve are arranged, the upper sleeve and the lower sleeve are meshed with the end parts of the square tubes in a distinguishing mode, the upper sleeve and the lower sleeve are connected through high-strength bolts, extrusion of the outer sleeve teeth and the end parts of the square tubes is achieved, efficient connection is achieved through shearing resistance and surface friction force of the composite material teeth, the composite material pipe penetrating damage is different from traditional bolt connection, and the strength of the composite material can be exerted to the greatest extent through the connection mode.

The foregoing has outlined and described the basic principles, features, and advantages of the present application. It will be understood by those skilled in the art that the foregoing embodiments are not intended to limit the application, and the above embodiments and descriptions are meant to be illustrative only of the principles of the application, and that various modifications, equivalent substitutions, improvements, etc. may be made within the spirit and scope of the application without departing from the spirit and scope of the application.

Claims (10)

1. The prestress assembled composite material emergency vehicle bridge is characterized by comprising a plurality of single bridge section modules spliced into an emergency vehicle bridge main body structure, and an adjustable vertical stay bar and a rope which are positioned below the emergency vehicle bridge main body structure, wherein the rope adopts a folded prestress rope arrangement mode; the Shan Qiaojie module comprises a plurality of composite square tube beams which are arranged in parallel, wherein two ends of each composite square tube beam are provided with end connection nodes, and a beam end pretightening force tooth connection mode is adopted; the end connection nodes between the composite square pipe beams are connected through transverse connection pipes to form an integrated structure; connecting devices are respectively arranged below two ends of a plurality of pairs of composite square tube beams which are symmetrical with each other along the central line of the length direction of the emergency bridge on the Shan Qiaojie module, the single bridge section modules are connected through the matching installation of the connecting devices, each connecting point is provided with a transition node, and the transition nodes which are positioned on the same straight line along the length direction of the emergency bridge are recorded as a group of transition nodes; the adjustable vertical stay bars are perpendicular to the bridge deck, the tops of the adjustable vertical stay bars are connected with all transition nodes located in the middle of the emergency vehicle bridge along the width direction of the emergency vehicle bridge, a plurality of ropes penetrate through the nodes arranged at the bottoms of the adjustable vertical stay bars, and respectively penetrate through a group of transition nodes and are fixedly connected with the transition nodes at the outermost side, and the number of the ropes is the same as the number of the transition nodes; two ends of the main body structure of the emergency vehicle bridge are respectively arranged on the support through support connecting pieces; the prestress of the rope is changed by adjusting the length of the adjustable vertical stay bar, so that the camber of the bridge is changed.

2. The pre-stressed assembled composite emergency roadway bridge of claim 1, wherein aluminum alloy deck boards are laid on the Shan Qiaojie modules.

3. The pre-stressed assembled composite emergency vehicle bridge of claim 1, wherein the ends of the composite square tube beam are toothed; the end connection node comprises a U-shaped metal upper outer sleeve, a U-shaped metal lower outer sleeve and a metal inner sleeve; the U-shaped metal upper outer sleeve and the U-shaped metal lower outer sleeve are respectively provided with a convex notch matched with the open tooth at the end part of the composite square tubular beam; the U-shaped metal upper outer sleeve and the U-shaped metal lower outer sleeve openings are oppositely assembled on the upper side and the lower side of the end part of the composite square tube beam, prestress is applied to the upper surface and the lower surface of the composite square tube beam, and a gap exists between the bottoms of the two U-shaped outer sleeve openings after the assembly; the two U-shaped outer sleeves exert pretightening force through a locking device, so that the gap is closed; the metal inner sleeve is inserted into the end part of the composite square tubular beam to be used as a lining; the U-shaped metal lower outer sleeves of the two composite square tube beams are connected through the connecting device to realize beam-beam connection, so that connection between the single-bridge-section modules is realized.

4. The prestressed assembled composite emergency vehicle bridge of claim 3, wherein the number, depth and width of the open teeth at the end of the composite square tube beam are set in a self-defined manner according to the bearing capacity requirement.

5. The pre-stressed assembled composite emergency vehicle axle of claim 3, wherein stiffening ribs are disposed inside the metal inner sleeve.

6. The prestressed assembled composite emergency vehicle bridge according to claim 3, wherein the openings of the outer sleeve at the upper part of the U-shaped metal and the outer sleeve at the lower part of the U-shaped metal are provided with folded angle edges which are bent outwards, and the locking device applies pretightening force to the two outer sleeves by applying pretightening force to the folded angle edges.

7. The prestressed assembled composite emergency vehicle bridge of claim 3, wherein stiffening ribs are arranged between the folded corner edges and the U-shaped metal upper outer sleeve or the U-shaped metal lower outer sleeve.

8. The pre-stressed split composite emergency vehicle axle of claim 3, wherein said connection means comprises a single/double ear connection member disposed on said U-shaped metal lower outer sleeve.

9. The prestressed assembled composite emergency vehicle bridge of claim 1, wherein smooth chamfers are arranged at the nodes at the bottom of the adjustable vertical stay bar and in the rope penetration areas in the transition nodes.

10. The prestressed assembled composite emergency vehicle bridge according to claim 1, wherein the support comprises a base and a circular tube arranged on the base, arc-shaped pouring openings are arranged at the bottoms of two ends of the main body structure of the emergency vehicle bridge, the inner diameter of the arc-shaped pouring openings is identical to the outer diameter of the circular tube, and the arc-shaped pouring openings are installed in a matched mode and can rotate along the surface of the circular tube.