Large-span Bailey steel trestle

Abstract

The utility model relates to the technical field of Bailey bridges, and discloses a large-span Bailey steel trestle which comprises a bridge floor and a plurality of Bailey piece groups which are arranged on two sides of the bridge floor and are spliced end to end, the beret piece set comprises two beret piece plates, a first connecting frame located at the upper side position between the two beret piece plates, and a second connecting frame located at the lower side position between the two beret piece plates. The beret piece plate comprises three stand columns, transverse rods welded to the positions of the two sides of the upper ends and the lower ends of the three stand columns, connecting rods welded between every two adjacent stand columns and attaching plates welded to the junctions of the connecting rods and the stand columns, extension parts are integrally arranged at the ends of the transverse rods, and first through holes are formed in the extension parts. A splicing column used for being embedded between the two extension parts is arranged at the end, away from the extension parts, of the stand column, a second through hole used for being in butt joint with the first through hole is formed in the splicing column, and a first bolt penetrating through the first through hole and the second through hole to be connected through a nut is arranged between the splicing column and the extension parts.

Description

Technical Field

[0001] The utility model belongs to the technical field of Bailey bridges, and particularly relates to a long-span Bailey steel trestle bridge. Background Art

[0002] The Bailey steel trestle bridge is composed of lightweight standardized truss unit components made of high-strength steel, cross beams, longitudinal beams, bridge decks, bridge seats and connecting pieces, etc. It can be quickly assembled on-site with special installation equipment into truss beam bridges suitable for various spans and loads.

[0003] At present, a Chinese patent with the publication number CN221626811U and the publication date of August 30, 2024 discloses a connection and fixation structure of Bailey plates, including a first Bailey plate, a second Bailey plate and a fixation structure. The fixation structure is located between the first Bailey plate and the second Bailey plate and is connected to the first Bailey plate and the second Bailey plate. The fixation structure includes a plurality of connecting plates and a plurality of diagonal braces. One end of the diagonal brace is provided with a first diagonal brace fixing plate, and the other end of the diagonal brace is provided with a second diagonal brace fixing plate. A plurality of connecting plates are cross-fixed on the first Bailey plate and the second Bailey plate, and the distance between adjacent two connecting plates is equal. The first diagonal brace fixing plate is connected to the top of one side of the connecting plate connected to the first Bailey plate, and the second diagonal brace fixing plate is connected to the bottom of one side of the connecting plate connected to the adjacent second Bailey plate.

[0004] When building a Bailey steel trestle bridge with Bailey plates, only a single layer of Bailey plates is often used on both sides of the bridge deck. At this time, the structural strength of the Bailey steel trestle bridge is insufficient, and it is impossible to achieve long-span construction, which brings many limitations to the use of the Bailey steel trestle bridge. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a long-span Bailey steel trestle bridge, which is beneficial to improving the structural strength of the bridge body and thus realizing long-span construction.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions: A long-span Bailey steel trestle bridge includes a bridge deck and a plurality of groups of Bailey plates arranged on both sides of the bridge deck and spliced end to end. Each group of Bailey plates includes two Bailey plate bodies, a first connection frame located at the upper side between the two Bailey plate bodies, and a second connection frame located at the lower side between the two Bailey plate bodies. Each Bailey plate body includes three columns, cross bars welded to the upper and lower ends of the three columns at both sides, connecting rods welded between adjacent two columns, and fitting plates welded at the intersection of the connecting rods and the columns. An extension part is integrally arranged at the end of the cross bar. A first through hole is opened on the extension part. A splicing column for embedding between the two extension parts is arranged at the end of the column far from the extension part. A second through hole for docking with the first through hole is opened on the splicing column. A first bolt that passes through the first through hole and the second through hole and is connected by a nut is arranged between the splicing column and the extension part.

[0007] By adopting the above technical solution, the Bailey beam group includes two Bailey beam plates, a first connection frame located at the upper side position between the two Bailey beam plates, and a second connection frame located at the lower side position between the two Bailey beam plates. At this time, the side position of the bridge deck can be structurally strengthened by two layers of Bailey beam plates. At the same time, when adjacent Bailey beam groups are docked, the first bolt passes through the first through hole and the second through hole and is connected by a nut. Finally, it is beneficial to improve the structural strength of the bridge body and achieve large-span erection.

[0008] A further setting of the present utility model is that connecting rods with an L-shaped cross-section that abut against the side wall of the cross bar are welded to the ends of the first connection frame and the second connection frame. Third through holes corresponding to the positions between the two cross bars are opened at both ends of the connecting rod. A second bolt is provided at the end of the connecting rod, which passes through the third through hole and then through the gap between the two cross bars and is connected by a nut.

[0009] By adopting the above technical solution, when the first connection frame and the second connection frame are fixedly connected to the cross bar, the connecting rods welded to the ends of the first connection frame and the second connection frame are utilized. The second bolt passes through the third through hole at the end of the connecting rod and the gap between the two cross bars and is connected by a nut. Finally, the stable fixed connection of the first connection frame and the second connection frame on the cross bar can be realized, thereby improving the structural stability between the two layers of Bailey beam plates through the first connection frame and the second connection frame.

[0010] A further setting of the present utility model is that the bridge deck includes a plurality of panels that are butted end to end at positions corresponding to a plurality of Bailey beam plates respectively.

[0011] By adopting the above technical solution, since the bridge deck includes a plurality of panels that are butted end to end at positions corresponding to a plurality of Bailey beam plates respectively, the rapid assembly of the bridge deck can be facilitated at this time.

[0012] A further setting of the present utility model is that transverse axes with ends passing through two Bailey beam plates are provided at both ends of the lower surface of the panel. Z-shaped connecting plates are provided at the ends of the transverse axes and at positions corresponding to the Bailey beam plates. Fourth through holes corresponding to the positions between the two cross bars are opened at the lower ends of the connecting plates. A third bolt is provided at the lower end of the connecting plate, which passes through the fourth through hole and then through the gap between the two cross bars and is connected by a nut. Fifth through holes are opened at the upper ends of the connecting plates. Threaded holes corresponding to the fifth through hole positions are opened at the ends of the transverse axes. A fourth bolt is provided at the end of the transverse axis, which passes through the fifth through hole and is threadedly connected into the threaded hole.

[0013] By adopting the above technical solution, when the panel is connected and fixed to the two side Bailey plates, the horizontal axis passes through the two Bailey plates, and then at the position of the connecting plate at the end of the horizontal axis corresponding to the Bailey plates, the third bolt passes through the fourth through hole at the lower end of the connecting plate and then through the gap between the two cross bars and is connected by a nut. At the same time, the fourth bolt passes through the fifth through hole and is threadedly connected to the threaded hole at the end of the horizontal axis. At this time, the stable connection between the horizontal axis and the Bailey plates can be realized, which is beneficial to the stable connection between the panel and the two side Bailey plates.

[0014] A further setting of the present utility model is that: a positioning port for the upright column to pass through is opened at the upper end of the connecting plate.

[0015] By adopting the above technical solution, when the connecting plate is being connected, the connecting plate uses the positioning port for the upright column to pass through. At this time, the position of the connecting plate can be positioned through the positioning port and the upright column, which is beneficial to the stable connection between the connecting plate between the horizontal axis and the cross bar.

[0016] A further setting of the present utility model is that: an X-shaped reinforcing frame is arranged between the two horizontal axes located at the lower surface of the panel.

[0017] By adopting the above technical solution, by using the X-shaped reinforcing frame arranged between the two horizontal axes located at the lower surface of the panel, the reinforcing frame can connect the two horizontal axes, thereby enhancing the compressive structural strength of the bridge deck.

[0018] A further setting of the present utility model is that: connection seats are arranged at the four side positions of the lower surface of the panel. A connection pipe is arranged in the middle of the connection seat. A balloon filled with hydrogen peroxide is arranged in the middle of the connection pipe. An elastic band is connected between the balloon and the connection pipe. Mesh disks are arranged at both ends inside the connection pipe. Spikes for puncturing the balloon are arranged on the inner wall of the mesh disk. Airbag pipes filled with manganese dioxide powder are connected to both ends outside the connection pipe; the connection seat and the panel are detachably connected by bolts.

[0019] By adopting the above technical solution, when the bridge body topples, due to the inclination of the panel, the balloon in the connection pipe will shift under its own gravity. Subsequently, the balloon can impact on the mesh disks at both ends of the connection pipe. At this time, the spikes on the inner wall of the mesh disk can puncture the balloon, thereby releasing the hydrogen peroxide in the balloon. Subsequently, the hydrogen peroxide can pass through the mesh disk and enter the airbag pipe. Among them, the airbag pipe is filled with manganese dioxide powder. When the hydrogen peroxide contacts the manganese dioxide powder, a reaction can occur. The hydrogen peroxide can be decomposed into water and oxygen under the catalytic action of manganese dioxide. At this time, the generated gas can cause the airbag pipe to bulge. Subsequently, the panel can float on the water surface relying on the bulging airbag pipes on the lower surface, which is helpful for rescuing people who fall into the water;

[0020] When emergency rescue is needed for the trapped personnel on the panel and oxygen is required, the connecting seat and the panel are detachably connected by bolts. After removing the connecting seat on the lower surface of the panel, the airbag tube can be taken out, and the oxygen generated by the decomposition of hydrogen peroxide can be used to help with the first aid.

[0021] A further setting of the present utility model is that L-shaped connecting blocks are arranged at the lower surface of the panel and at the end of the airbag tube far from the connecting tube. A groove in the shape of an L is formed on the side of the connecting block close to the panel. At the end position of the horizontal axis, blocks for being embedded in the groove are connected. At the lower surface of the panel, a separating member is provided for driving the block out of the groove when the airbag tube expands.

[0022] By adopting the above technical solution, since the panel is connected to the Bailey plate by the horizontal axis, when the panel falls into the water, it will sink under the influence of the gravity of the horizontal axis and the Bailey plate, and it is impossible to stably support the panel relying on the airbag tube. At this time, the separating member drives the block out of the groove when the airbag tube expands, and at this time the panel can be separated from the horizontal axis, thus helping the panel to float stably on the water surface.

[0023] A further setting of the present utility model is that a corrugated telescopic part is arranged at the end of the airbag tube far from the connecting tube. The separating member includes a push plate arranged on the side of the block far from the connecting block, a connecting arm with one end connected to the horizontal axis, a guiding arm in the shape of an L arranged at the end of the connecting arm far from the horizontal axis, strip-shaped holes formed at both ends of the guiding arm, guiding shafts arranged at the two side edges of the block far from the connecting block and respectively passing through the two strip-shaped holes, and connecting springs sleeved on the guiding shafts and abutting against the guiding arm at one end and the side edge of the block at the other end. The push plate is in the shape of an L and the two side plates respectively correspond to the end positions of two adjacent airbag tubes.

[0024] By adopting the above technical solution, when the bridge body topples and the panel tilts in the left and right directions, the balloons in the connecting tubes on the front and rear sides of the lower surface of the panel can be offset and punctured. At this time, the airbag tubes on the front and rear connecting tubes bulge, and expand towards the push plate side through the corrugated telescopic part. When the bridge body topples and the panel tilts in the front and rear directions, the balloons in the connecting tubes on the left and right sides of the lower surface of the panel can be offset and punctured. At this time, the airbag tubes on the left and right connecting tubes bulge, and expand towards the push plate side through the corrugated telescopic part. Finally, it can be ensured that no matter which side the panel tilts towards, the corresponding airbag tube can bulge.

[0025] Whether it is the inflation of the airbag tube at the left and right positions of the panel or the inflation of the airbag tube at the front and back positions of the panel, after the airbag tube is inflated, it can push the push plate to move away from the connecting block, and the connecting spring is compressed. Until the latch disengages from the card slot, under the action of the self-weight of the horizontal shaft, the horizontal shaft can be separated from the panel, and finally it can help the panel to float stably on the water surface after being separated from the horizontal shaft.

[0026] A further setting of the present utility model is that: there are four Bailey truss groups located at the side positions of each panel, and the four Bailey truss groups are distributed in upper and lower layers, and the upper and lower layers of Bailey truss groups are connected and fixed by bolts and nuts.

[0027] By adopting the above technical solution, since there are four Bailey truss groups located at the side positions of each panel, the structural strength of the bridge body can be further improved at this time, which is beneficial to realizing large-span erection.

[0028] The beneficial effects of the present utility model are as follows: the side position of the bridge deck is structurally strengthened by two layers of Bailey truss plates. Among them, the connecting rods welded to the ends of the first connecting frame and the second connecting frame are utilized. The second bolt passes through the third through hole at the end of the connecting rod and the gap between the two cross bars and is connected by a nut, so as to realize the stable fixed connection of the first connecting frame and the second connecting frame on the cross bar; when the panel is connected and fixed to the two side Bailey truss plates, the horizontal shaft passes through the two Bailey truss plates, and then at the position of the connecting plate at the end of the horizontal shaft corresponding to the Bailey truss plate, the third bolt passes through the fourth through hole at the lower end of the connecting plate and then through the gap between the two cross bars and is connected by a nut. At the same time, the fourth bolt passes through the fifth through hole and is threadedly connected to the threaded hole at the end of the horizontal shaft. At this time, the stable connection between the horizontal shaft and the Bailey truss plate can be realized; at the same time, when adjacent Bailey truss groups are butted, the first bolt passes through the first through hole and the second through hole and is connected by a nut. Finally, it is beneficial to improve the structural strength of the bridge body and realize large-span erection;

[0029] When the bridge body topples and the panel tilts left or right, the balloons in the connecting pipes on the front and rear sides of the lower surface of the panel can be offset and punctured. At this time, the airbag pipes on the front and rear connecting pipes bulge, and expand toward the push plate side through the corrugated telescopic part. When the bridge body topples and the panel tilts forward or backward, the balloons in the connecting pipes on the left and right sides of the lower surface of the panel can be offset and punctured. At this time, the airbag pipes on the left and right connecting pipes bulge, and expand toward the push plate side through the corrugated telescopic part. Eventually, no matter which side the panel tilts, the corresponding airbag pipe can bulge. Whether the airbag pipes on the left and right positions of the panel bulge or the airbag pipes on the front and rear positions of the panel bulge, after the airbag pipes bulge, they can all push the push plate to move away from the connecting block side, and the connecting spring is compressed. Until the latch disengages from the card slot, under the action of the self-gravity of the cross shaft, the cross shaft can be separated from the panel. Eventually, it can help the panel to float stably on the water surface after detaching from the cross shaft. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of Embodiment 1;

[0032] Figure 2 It is a schematic structural diagram of the connection relationship between a single panel and the two-side Bailey truss groups in Embodiment 1;

[0033] Figure 3 It is a schematic structural diagram of the Bailey truss group in Embodiment 1;

[0034] Figure 4 It is a partial cross-sectional view of the connection relationship between the Bailey truss plate, the second connection frame, the cross shaft, and the connection plate in Embodiment 1;

[0035] Figure 5 It is a schematic diagram of the connection relationship between the panel, the cross shaft, and the reinforcing frame in Embodiment 1;

[0036] Figure 6 It is a schematic structural diagram of the lower surface of the panel in Embodiment 2;

[0037] Figure 7 It is a partial cross-sectional view of the connection relationship between the connecting pipe, the balloon, and the airbag pipe in Embodiment 2, and at this time the airbag pipe is in an inflated state;

[0038] Figure 8It is a schematic diagram of the connection relationship among the connecting block, the clamping block and the disengaging member in the second embodiment, in which the connecting block and the clamping block are shown in an exploded view;

[0039] Figure 9 It is a structural plan view of the lower surface of the panel in the second embodiment. The airbag tubes at the upper and lower positions in the figure bulge and drive the four clamping blocks to disengage from the card slots;

[0040] Figure 10 It is a schematic structural diagram of the connection relationship between a single panel and the Bailey truss groups on both sides in the third embodiment.

[0041] In the figure, 1, bridge deck; 11, panel; 111, connecting block; 112, card slot; 2, Bailey truss group; 21, Bailey truss plate; 211, column; 2111, splicing column; 2112, second through hole; 2113, first bolt; 212, cross bar; 2121, extension part; 2122, first through hole; 213, connecting rod; 214, fitting plate; 22, first connection frame; 23, second connection frame; 3, connecting rod; 31, third through hole; 32, second bolt; 4, cross shaft; 41, threaded hole; 42, fourth bolt; 43, reinforcing frame; 44, clamping block; 5, connecting plate; 51, fourth through hole; 52, third bolt; 53, fifth through hole; 54, positioning port; 6, connecting seat; 61, connecting pipe; 611, balloon; 612, elastic band; 613, wire mesh; 614, spike; 7, airbag tube; 71, corrugated telescopic part; 8, disengaging member; 81, push plate; 82, connecting arm; 83, guiding arm; 84, strip hole; 85, guiding shaft; 86, connecting spring. Detailed implementation manners

[0042] The technical solutions in the embodiments will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] Embodiment 1: A long-span Bailey steel trestle, referring to Figure 1 , Figure 2 , Figure 3, the large-span Bailey steel trestle includes a bridge deck 1 and multiple groups of Bailey sheets 2 arranged on both sides of the bridge deck 1 and spliced end to end. The group of Bailey sheets 2 includes two Bailey sheet plates 21, a first connecting frame 22 located at the upper side between the two Bailey sheet plates 21, and a second connecting frame 23 located at the lower side between the two Bailey sheet plates 21. The Bailey sheet plate 21 includes columns 211, crossbars 212, connecting rods 213, and fitting plates 214. There are three columns 211, and the crossbars 212 are welded to both sides of the upper and lower ends of the three columns 211. At the same time, the connecting rods 213 are welded between adjacent columns 211, and the fitting plates 214 are welded to the outer walls at the intersections of the connecting rods 213 and the columns 211.

[0044] Refer to Figure 2 , Figure 3 , Figure 4 , connecting rods 3 with an L-shaped cross-section that abut against the side walls of the crossbars 212 are welded to the ends of the first connecting frame 22 and the second connecting frame 23. Third through holes 31 corresponding to the positions between the two crossbars 212 are opened at both ends of the connecting rod 3. A second bolt 32 is provided at the end of the connecting rod 3. The second bolt 32 passes through the third through hole 31 and the gap between the two crossbars 212 and is connected by a nut. At the same time, an extension 2121 is integrally provided at the end of the crossbar 212, and a first through hole 2122 is opened on the extension 2121. A splicing column 2111 for embedding between the two extensions 2121 is welded to the end of the column 211 on the side away from the extension 2121. A second through hole 2112 for docking with the first through hole 2122 is opened on the splicing column 2111. A first bolt 2113 is provided between the splicing column 2111 and the extension 2121. The first bolt 2113 passes through the first through hole 2122 and the second through hole 2112 and is connected by a nut.

[0045] Refer to Figure 2 , Figure 3 , Figure 4 , Figure 5, the bridge deck 1 includes multiple panels 11 that are respectively located at positions corresponding to multiple Bailey plate units 21 and are butted end to end. At both ends of the lower surface of the panel 11, a horizontal shaft 4 is provided with its end passing through two Bailey plate units 21. At the end of the horizontal shaft 4 and at positions corresponding to the Bailey plate units 21, connecting plates 5 in a Z shape are provided. At the same time, a fourth through hole 51 corresponding to the position between two cross bars 212 is opened at the lower end of the connecting plate 5, and a third bolt 52 is provided at the lower end of the connecting plate 5. The third bolt 52 passes through the fourth through hole 51 and the gap between the two cross bars 212 and is connected by a nut; at the upper end of the connecting plate 5, a fifth through hole 53 is opened, and at the end of the horizontal shaft 4, a threaded hole 41 corresponding to the position of the fifth through hole 53 is opened. At the same time, a fourth bolt 42 is provided at the end of the horizontal shaft 4 and passes through the fifth through hole 53 and is threadedly connected into the threaded hole 41. At the upper end of the connecting plate 5, a positioning opening 54 for the upright column 211 to pass through is also opened; between the two horizontal shafts 4 located at the lower surface of the panel 11, an X-shaped reinforcing frame 43 is welded.

[0046] Principle: The structure of the side position of the bridge deck 1 is strengthened by two layers of Bailey plate units 21. Among them, the connecting rods 3 welded to the ends of the first connecting frame 22 and the second connecting frame 23 are used. The second bolt 32 passes through the third through hole 31 at the end of the connecting rod 3 and the gap between the two cross bars 212 and is connected by a nut, so as to realize the stable fixed connection of the first connecting frame 22 and the second connecting frame 23 on the cross bar 212; when the panel 11 is connected and fixed to the Bailey plate units 21 on both sides, the horizontal shaft 4 passes through the two Bailey plate units 21. Subsequently, at the position of the connecting plate 5 corresponding to the Bailey plate units 21 at the end of the horizontal shaft 4, the third bolt 52 passes through the fourth through hole 51 at the lower end of the connecting plate 5 and then through the gap between the two cross bars 212 and is connected by a nut. At the same time, the fourth bolt 42 passes through the fifth through hole 53 and is threadedly connected into the threaded hole 41 at the end of the horizontal shaft 4. At this time, the stable connection between the horizontal shaft 4 and the Bailey plate units 21 can be realized; at the same time, when adjacent Bailey beam groups 2 are butted, the first bolt 2113 passes through the first through hole 2122 and the second through hole 2112 and is connected by a nut. Finally, it is beneficial to improve the structural strength of the bridge body and realize large-span construction;

[0047] Embodiment 2: A large-span Bailey steel trestle, referring to Figure 6 , Figure 7, different from the first embodiment in that: connection seats 6 are provided at four side positions on the lower surface of the panel 11, and the connection seats 6 are detachably connected to the panel 11 by bolts. A connecting pipe 61 is fixed in the middle of the connection seat 6 by bolts. A balloon 611 filled with hydrogen peroxide is arranged inside the middle of the connecting pipe 61. At the same time, an elastic band 612 is connected between the balloon 611 and the connecting pipe 61. The upper end of the elastic band 612 is bonded to the inner wall of the connecting pipe 61 and the lower end is bonded to the outer wall of the balloon 611. Grid-like mesh plates 613 are welded inside both ends of the connecting pipe 61, and spikes 614 for piercing the balloon 611 are welded on the inner wall of the mesh plate 613. At the same time, airbag tubes 7 filled with manganese dioxide powder are bonded and fixed outside both ends of the connecting pipe 61. A corrugated expansion part 71 is integrally arranged at one end of the airbag tube 7 far from the connecting pipe 61. After the airbag tube 7 bulges, the corrugated expansion part 71 can expand outwards.

[0048] Refer to Figure 6 , Figure 7 , Figure 8 , Figure 9 , L-shaped connection blocks 111 are welded at the lower surface of the panel 11 and at the positions where the airbag tubes 7 are far from the connecting pipe 61. An L-shaped card slot 112 is opened inside the side of the connection block 111 close to the panel 11. At the end positions of the cross shaft 4, blocks 44 for embedding in the card slot 112 are connected. A disengaging member 8 is arranged on the lower surface of the panel 11 to drive the block 44 to break out of the card slot 112 after the airbag tube 7 expands. The disengaging member 8 includes a push plate 81, a connecting arm 82, a guiding arm 83, a strip-shaped hole 84, a guiding shaft 85, and a connecting spring 86. The push plate 81 is integrally arranged on the side of the block 44 far from the connection block 111. The push plate 81 is L-shaped and the two side plates respectively correspond to the end positions of two adjacent airbag tubes 7. At the same time, one end of the connecting arm 82 is welded to the cross shaft 4, and the guiding arm 83 is welded to the end of the connecting arm 82 far from the cross shaft 4 and is L-shaped. The strip-shaped hole 84 is opened at both ends of the guiding arm 83. The guiding shaft 85 is welded to the two side edges of the block 44 far from the connection block 111 and respectively passes through the two strip-shaped holes 84. At the same time, the connecting spring 86 is sleeved on the guiding shaft 85, and one end of the connecting spring 86 abuts against the guiding arm 83 and the other end abuts against the side of the block 44.

[0049] Principle: When the bridge body topples and the panel 11 tilts in the left - right direction, the balloons 611 in the connecting pipes 61 on the front and rear sides of the lower surface of the panel 11 can be offset and then punctured. At this time, the airbag pipes 7 on the front and rear connecting pipes 61 bulge, and expand towards the push plate 81 side through the corrugated telescopic part 71; when the bridge body topples and the panel 11 tilts in the front - rear direction, the balloons 611 in the connecting pipes 61 on the left and right sides of the lower surface of the panel 11 can be offset and then punctured. At this time, the airbag pipes 7 on the left and right connecting pipes 61 bulge, and expand towards the push plate 81 side through the corrugated telescopic part 71; finally, no matter which side the panel 11 tilts towards, the corresponding airbag pipe 7 can bulge; whether it is the airbag pipe 7 at the left - right position of the panel 11 bulging or the airbag pipe 7 at the front - rear position of the panel 11 bulging, after the airbag pipe 7 bulges, it can push the push plate 81 to move away from the connecting block 111 side, and the connecting spring 86 is compressed. Until the latch 44 disengages from the card slot 112, under the action of the self - weight of the cross - shaft 4, the cross - shaft 4 can complete the separation from the panel 11. Finally, it can help the panel 11 to float stably on the water surface after detaching from the cross - shaft 4.

[0050] Embodiment 3: A long - span Bailey steel trestle bridge, referring to Figure 10 , which is different from Embodiment 1 in that: there are four Bailey girder groups 2 at the side position of each panel 11, and the four Bailey girder groups 2 are distributed in upper and lower layers, and the upper and lower layers of Bailey girder groups 2 are connected and fixed by bolts and nuts. The bolts pass through the gap between two cross - bars 212 and are connected and fixed by nuts.

Claims

1. A long-span Bailey steel trestle bridge, comprising a bridge deck (1) and a plurality of Bailey sheet groups (2) arranged on both sides of the bridge deck (1) and spliced end to end, characterized in that: The Bailey beam group (2) includes two Bailey beam plates (21), a first connection frame (22) located at the upper side position between the two Bailey beam plates (21), and a second connection frame (23) located at the lower side position between the two Bailey beam plates (21). The Bailey beam plate (21) includes three columns (211), cross bars (212) welded to both sides of the upper and lower ends of the three columns (211), connecting rods (213) welded between adjacent two columns (211), and fitting plates (214) welded at the intersection of the connecting rod (213) and the column (211). An extension part (2121) is integrally arranged at the end of the cross bar (212), and a first through hole (2122) is opened on the extension part (2121). A splicing column (2111) for embedding between the two extension parts (2121) is arranged at the end of the column (211) on the side far from the extension part (2121). A second through hole (2112) for docking with the first through hole (2122) is opened on the splicing column (2111). A first bolt (2113) is arranged between the splicing column (2111) and the extension part (2121), which passes through the first through hole (2122) and the second through hole (2112) and is connected by a nut.

2. The long-span Bailey steel trestle according to claim 1, characterized in that: Connecting rods (3) with an L-shaped cross section and abutting against the side wall of the cross bar (212) are welded at the ends of the first connection frame (22) and the second connection frame (23). Third through holes (31) corresponding to the position between the two cross bars (212) are opened at both ends of the connecting rod (3). A second bolt (32) is arranged at the end of the connecting rod (3), which passes through the third through hole (31), then passes through the gap between the two cross bars (212) and is connected by a nut.

3. The long-span Bailey steel trestle according to claim 1, characterized in that: The bridge deck (1) includes a plurality of panels (11) respectively corresponding to the positions of a plurality of Bailey beam plates (21) and butt-jointed end to end.

4. A large-span Bailey steel trestle according to claim 3, characterized in that: Transverse axes (4) with ends passing through the two Bailey beam plates (21) are arranged at both ends of the lower surface of the panel (11). Z-shaped connecting plates (5) are arranged at the ends of the transverse axes (4) corresponding to the positions of the Bailey beam plates (21). Fourth through holes (51) corresponding to the position between the two cross bars (212) are opened at the lower ends of the connecting plates (5). A third bolt (52) is arranged at the lower end of the connecting plate (5), which passes through the fourth through hole (51), then passes through the gap between the two cross bars (212) and is connected by a nut. Fifth through holes (53) are opened at the upper ends of the connecting plates (5). Threaded holes (41) corresponding to the positions of the fifth through holes (53) are opened at the ends of the transverse axes (4). Fourth bolts (42) are arranged at the ends of the transverse axes (4), which pass through the fifth through holes (53) and are threadedly connected into the threaded holes (41).

5. The long-span Bailey steel trestle according to claim 4, characterized in that: Positioning ports (54) for the columns (211) to pass through are opened at the upper ends of the connecting plates (5).

6. A large-span Bailey steel trestle according to claim 4, characterized in that: An X-shaped strengthening frame (43) is arranged between the two transverse axes (4) at the lower surface of the panel (11).

7. A long-span Bailey steel trestle bridge according to claim 4, characterized in that: At the four side positions on the lower surface of the panel (11), connecting seats (6) are provided. A connecting pipe (61) is arranged in the middle of the connecting seat (6). A balloon (611) filled with hydrogen peroxide is arranged inside the middle of the connecting pipe (61). An elastic band (612) is connected between the balloon (611) and the connecting pipe (61). Mesh plates (613) are arranged at both ends inside the connecting pipe (61). Spikes (614) for puncturing the balloon (611) are arranged on the inner wall of the mesh plate (613). Airbag pipes (7) filled with manganese dioxide powder are connected to the outsides of both ends of the connecting pipe (61). The connecting seat (6) and the panel (11) are detachably connected by bolts.

8. A long-span Bailey steel trestle bridge according to claim 7, characterized in that: L-shaped connecting blocks (111) are arranged at the lower surface of the panel (11) and at the ends of the airbag pipes (7) far from the connecting pipe (61). An L-shaped card slot (112) is formed on the side of the connecting block (111) close to the panel (11). Clamping blocks (44) for embedding in the card slot (112) are connected to the end positions of the transverse axis (4). A separating member (8) is arranged on the lower surface of the panel (11) to drive the clamping block (44) to disengage from the card slot (112) when the airbag pipe (7) expands.

9. A large-span Bailey steel trestle according to claim 8, characterized in that: A corrugated telescopic part (71) is arranged at the end of the airbag pipe (7) far from the connecting pipe (61). The separating member (8) includes a push plate (81) arranged on the side of the clamping block (44) far from the connecting block (111), a connecting arm (82) with one end connected to the transverse axis (4), a guiding arm (83) arranged at the end of the connecting arm (82) far from the transverse axis (4) and in an L shape, strip-shaped holes (84) formed at both ends of the guiding arm (83), guiding shafts (85) arranged on the two side edges of the clamping block (44) far from the connecting block (111) and respectively passing through the two strip-shaped holes (84), and a connecting spring (86) sleeved on the guiding shaft (85) and with one end abutted against the guiding arm (83) and the other end abutted against the side of the clamping block (44). The push plate (81) is in an L shape and the two side plates respectively correspond to the end positions of two adjacent airbag pipes (7).

10. A long-span Bailey steel trestle according to claim 3, characterized in that: Four Bailey beam groups (2) are arranged at the side position of each panel (11). The four Bailey beam groups (2) are distributed in upper and lower layers, and the upper and lower layer Bailey beam groups (2) are connected and fixed by bolts and nuts.

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