A water outlet structure of a small bridge culvert resistant to water damage

Abstract

The invention discloses a water outlet structure of a small bridge culvert that is resistant to water damage, relates to the field of water outlet structures of bridge culverts, and solves the problem that the existing water outlet structure of a small bridge culvert is easily damaged on both sides of the water outlet when in use, and is difficult to adaptively adjust and reduce the speed according to the water flow speed. The structure comprises a force unloading mechanism, a lifting mechanism, a control mechanism and two groups of side blocks, wherein an arch is fixedly connected above the two groups of side blocks, the force unloading mechanism comprises two groups of drive shafts, and fan blades are fixedly connected on the sides of the drive shafts, the lifting mechanism comprises a lifting plate, and the control mechanism comprises an air filling box. The water outlet structure of the small bridge culvert that is resistant to water damage can facilitate adding fan blades capable of rotating to unload force on both sides of the water outlet position of the small bridge culvert, so that the impact force at the corner is guided by the rotation of the fan blades, and the impact wear at the corner of the side block is reduced, and the fan blades are used to drive the rotation speed change of the drive shaft to change the inflation rate of the air filling box, so that the height of the lifting plate is correspondingly changed.

Description

Technical Field

[0001] The invention relates to the technical field of small bridge culvert outlet structures, in particular to a small bridge culvert outlet structure that is resistant to water damage. Background Art

[0002] Bridges and culverts are important components of highways, especially large and medium-sized bridges, which have a great impact on highways, construction period and project cost. Highway bridge and culvert construction is closely related to farmland water conservancy and people's lives, and various factors should be considered in design and construction. Bridge and culvert classification uses two indicators, one is the single-hole span, and the other is the total length of multi-hole spans. Highway small bridges and culverts are small drainage structures that cross the highway to discharge ditch water when the highway crosses the ditch.

[0003] After the highway was built, the water flow converged to the small bridge culvert, and the water depth and water flow speed at the small bridge culvert were greater than those in natural conditions. At the outlet of the small bridge culvert, the water flow suddenly spreads after passing through the culvert outlet. Without the constraints of the culvert side wall, the water level will drop significantly, the gravitational potential energy will be converted into kinetic energy, and the water flow speed will be significantly accelerated, which will scour and damage the riverbed of the natural ditch. Because the water flow instantly spreads to the water surface, it will cause a large scour on both sides of the bridge culvert outlet. Long-term erosion will cause the bridge culvert outlet to gradually become larger, affecting the overall structural stability of the bridge culvert, and even causing collapse. To this end, we propose a small bridge culvert outlet structure that is resistant to water damage. Summary of the invention

[0004] The object of the present invention is to provide a small bridge culvert outlet structure that is resistant to water damage and can automatically unload force on both sides of the bridge culvert outlet and adaptively control the water flow rate, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a water outlet structure of a small bridge culvert that is resistant to water damage, comprising a force unloading mechanism, a lifting mechanism, a control mechanism and two groups of side blocks, wherein an arch is fixedly connected above the two groups of side blocks, and a bottom plate is fixedly connected below the two groups of side blocks, the force unloading mechanism comprises two groups of driving shafts respectively installed on the side blocks on both sides, and the sides of the driving shafts are evenly and fixedly connected with multiple groups of fan blades, the side blocks are provided with corner grooves, and the upper and lower ends of the driving shafts are rotatably connected to the corner grooves, the force unloading mechanism is used to increase the fan blades capable of rotatable force unloading on both sides of the small bridge culvert outlet position, so that the impact force at the corner is guided by the rotation of the fan blades, thereby reducing the impact wear on the corner of the side block, and the lifting mechanism comprises multiple groups of fan blades installed between the side blocks on both sides. The lifting plate, the lifting mechanism is used to control the lifting plate to be in a horizontal state when the water flow is slow, so as to reduce the resistance to the water flow. When the water flow increases, one end of the lifting plate is gradually lifted, so that the water flow has resistance to flowing uphill, and while slowing down part of the water flow, the vertical height of the water flow is increased, the vertical cross-section of the water flow is increased, and the water flow shows a trend of deceleration. The control mechanism includes an air box fixedly installed in the side baffle, and the control mechanism is used to drive the speed change of the drive shaft through the fan blades to change the inflation rate of the air box, so that the height of the lifting plate is changed accordingly. The greater the water flow, the faster the speed of the drive shaft, the greater the inflation rate of the air box, and the greater the slope caused by the lifting of the lifting plate, which is convenient for automatic unloading and adaptive control of the water flow rate on both sides of the bridge culvert outlet.

[0006] Preferably, the lifting mechanism also includes a rotating shaft fixedly mounted on the side of the lifting plate, both ends of the rotating shaft are respectively rotatably connected to the side blocks on both sides, a lifting groove is provided on the side block, a lifting rod is slidably connected in the lifting groove along the vertical direction, a plurality of groups of lifting shafts are evenly and fixedly connected to the side of the lifting rod, and lifting grooves slidably connected to the lifting shafts are provided on both sides of the lifting plate, and the control mechanism is used to control the lifting state of the lifting rod, so as to facilitate the control of the lifting angle of the lifting plate.

[0007] Preferably, the control mechanism also includes a first gear rotatably connected to the side stop, an inflation rod is rotatably connected to a non-center position on the side of the first gear, an inflation plate rotatably connected to one end of the inflation rod is slidably connected in the inflation box, a driving member is provided in the side stop for linking the first gear to rotate after the driving shaft speed reaches a set value, an air suction member for suction is provided on the inflation box, and a lifting member is provided on the inflation box for discharging gas so that the lifting rod is lifted, so as to sense the water flow velocity and link the lifting plate to lift it.

[0008] Preferably, the driving member includes a driving wheel coaxially fixedly installed on the upper end of the driving shaft, a rotating column is rotatably connected in the side stop, a driven wheel is coaxially fixedly connected to the rotating column, the outer wall of the driving wheel is transmission-connected to a transmission belt transmission-connected to the driven wheel, and the rotating column is provided with an engaging member for changing the meshing state with the first gear according to the rotation speed of the rotating column, so as to facilitate the linkage and rotation of the first gear after the driving shaft rotation speed reaches a set value.

[0009] Preferably, the engaging member includes a plurality of groups of tooth blocks mounted on the rotating column, a plurality of groups of sliding grooves are evenly arranged on the rotating column, elastic pull ropes are fixedly connected in the sliding grooves, the plurality of groups of tooth blocks are respectively connected to the sliding grooves for sliding in a horizontal direction, one end of the elastic pull rope is fixedly connected to the tooth block, and the tooth block can mesh with the first gear, so as to facilitate changing the meshing state with the first gear according to the rotation speed of the rotating column.

[0010] Preferably, the lifting member includes an exhaust pipe fixedly mounted on the inflation box, a one-way exhaust valve fixedly connected inside the exhaust pipe, one end of the exhaust pipe is connected to a fixed pipe, a lifting rod is slidably connected to the fixed pipe along a vertical direction, the upper end of the lifting rod is fixedly connected to a connecting rod fixedly connected to the side of the lifting rod, and an exhaust member for exhausting gas is provided on the fixed pipe to facilitate the exhaust of gas so that the lifting rod is lifted.

[0011] Preferably, the exhaust component includes a connecting pipe fixedly installed in the side baffle and the arch, and the side surface of the fixed pipe is evenly connected with multiple groups of connecting pipes in the vertical direction, and the multiple groups of connecting pipes are all connected to the connecting pipe. A gas supply pipe for connecting with external gas is opened in the arch to facilitate the discharge of gas.

[0012] Preferably, the air suction component includes an air intake pipe connected to the inflation box, one end of the air intake pipe is connected to the air delivery pipe, and a one-way air intake valve is fixedly connected in the air intake pipe to facilitate air intake.

[0013] Preferably, baffles for blocking the lifting groove are provided at both upper and lower ends of the lifting rod, so as to prevent mud and sand from accumulating at the upper and lower ends of the lifting groove during the lifting process of the lifting plate.

[0014] Preferably, a filter is fixedly connected to the gas pipe to prevent external pollution from entering the gas pipe.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention solves the problem that the existing small bridge culvert water outlet structure is easy to be damaged when in use, and it is difficult to adaptively adjust the speed reduction according to the water flow speed. By arranging a force unloading mechanism, a lifting mechanism and a control mechanism, it is convenient to add fan blades that can rotate to unload force on both sides of the small bridge culvert water outlet position, so that the impact force on the corner is guided by the rotation of the fan blades, and the impact wear on the side block corner is reduced. When the water flow is smooth, the lifting plate is controlled to be in a horizontal state to reduce the resistance to the water flow. When the water flow increases, one end of the lifting plate is gradually lifted up, so that the water flow has the resistance of flowing uphill, and at the same time, part of the water flow is reduced. When the water flow increases, the vertical height of the water flow increases, the vertical cross-section of the water flow at this position increases, and the water flow tends to slow down. The control mechanism uses fan blades to drive the rotation speed of the drive shaft to change, and changes the inflation rate of the air box, so that the height of the lifting plate changes accordingly. The greater the water flow, the faster the rotation speed of the drive shaft, the greater the inflation rate of the air box, and the greater the slope of the lifting plate. The surface of the device is relatively flat and has little resistance to the water flow. It does not require a driving source such as a motor to switch the overall operating mode of the device through the change of the flow rate of the water flow itself. It is convenient and efficient to install, which improves the service life of the small bridge culvert outlet and is convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the present invention;

[0019] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0020] Figure 4 It is a schematic diagram of the control mechanism structure of the present invention;

[0021] Figure 5 It is a schematic diagram of the structure of the force unloading mechanism of the present invention;

[0022] Figure 6 for Figure 5 A magnified image of area A;

[0023] Figure 7 It is a schematic diagram of the lifting mechanism structure of the present invention;

[0024] Figure 8 for Figure 7 Enlarged view of area B;

[0025] Fig. 9 It is a schematic diagram of the exhaust structure of the present invention;

[0026] Fig.10 for Fig. 9 Enlarged view of area C.

[0027] In the figure: 1-side stop; 2-arch; 3-bottom plate; 4-unloading mechanism; 5-driving shaft; 6-fan blade; 7-corner slot; 8-lifting mechanism; 9-lifting plate; 10-control mechanism; 11-inflating box; 12-rotating shaft; 13-lifting slot; 14-lifting rod; 15-lifting shaft; 16-lifting slot; 17-first gear; 18-inflating rod; 19-inflating plate; 20-driving member; 21-inhalation member; 22-lifting member; 2 3-driving wheel; 24-rotating column; 25-driven wheel; 26-transmission belt; 27-engaging member; 28-tooth block; 29-sliding groove; 30-elastic pull rope; 31-exhaust pipe; 32-one-way exhaust valve; 33-fixed pipe; 34-lifting rod; 35-connecting rod; 36-exhaust member; 37-connecting pipe; 38-connecting pipe; 39-air supply pipe; 40-intake pipe; 41-one-way intake valve; 42-baffle; 43-filter. Implementation

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0029] See also Figure 1-Figure 10The illustrated structure of a water-damage-resistant small bridge culvert outlet comprises a force unloading mechanism 4, a lifting mechanism 8, a control mechanism 10 and two sets of side guards 1. An arch 2 is fixedly connected above the two sets of side guards 1, and a bottom plate 3 is fixedly connected below the two sets of side guards 1. The force unloading mechanism 4 comprises two sets of driving shafts 5 respectively mounted on the side guards 1 on both sides, and multiple sets of fan blades 6 are evenly and fixedly connected to the sides of the driving shafts 5. A corner groove 7 is provided on the side guard 1, and the upper and lower ends of the driving shaft 5 are rotatably connected to the corner groove 7. The force unloading mechanism 4 is used to increase the fan blades 6 capable of rotating and unloading on both sides of the small bridge culvert outlet position, so that the impact force at the corner is guided by the rotation of the fan blades 6, thereby reducing the impact wear at the corner of the side guard 1. The lifting mechanism 8 comprises multiple sets of fan blades 6 installed at The lifting plate 9 between the side guards 1 on both sides and the lifting mechanism 8 are used to control the lifting plate 9 to be in a horizontal state when the water flow is smooth, thereby reducing the resistance to the water flow. When the water flow increases, one end of the lifting plate 9 is gradually lifted, so that the water flow has resistance to flowing uphill, and while slowing down part of the water flow, the vertical height of the water flow is increased, the vertical cross-section of the water flow is increased, and the water flow shows a trend of deceleration. The control mechanism 10 includes an air box 11 fixedly installed in the side guard 1. The control mechanism 10 is used to drive the rotation speed of the drive shaft 5 through the fan blades 6, and change the inflation rate of the air box 11, so that the height of the lifting plate 9 is changed accordingly. The greater the water flow, the faster the rotation speed of the drive shaft 5, the greater the inflation rate of the air box 11, and the greater the slope caused by the lifting of the lifting plate 9.

[0030] See also Figure 1-Figure 8 The lifting mechanism 8 shown in the figure also includes a rotating shaft 12 fixedly installed on the side of the lifting plate 9, and the two ends of the rotating shaft 12 are rotatably connected to the side blocks 1 on both sides respectively. A lifting groove 13 is opened on the side block 1, and a lifting rod 14 is slidably connected in the lifting groove 13 along the vertical direction. A plurality of groups of lifting shafts 15 are evenly and fixedly connected to the side of the lifting rod 14. Lifting grooves 16 slidably connected to the lifting shafts 15 are opened on both sides of the lifting plate 9. Baffles 42 for blocking the lifting grooves 13 are provided at the upper and lower ends of the lifting rod 14. The control mechanism 10 is used to control the lifting state of the lifting rod 14.

[0031] In this embodiment, the side guard 1, the bottom plate 3 and the arch 2 are installed as a whole at the position of the water outlet of the small bridge culvert and are relatively aligned. When the water flow in the small bridge culvert is discharged, the fan blades 6 on both sides will be pushed to rotate, so that the impact force on the corner is guided by the rotation of the fan blades 6, and the impact wear on the corner of the side guard 1 is reduced. When the water flow is slow, the lifting plate 9 is controlled to be in a horizontal state to reduce the resistance to the water flow. When the water flow increases, the fan blades 6 are used to drive the speed of the driving shaft 5 to change, and the inflation rate of the inflation box 11 is changed, so that the height of the lifting plate 9 is correspondingly changed. The greater the water flow, the faster the speed of the driving shaft 5. The greater the inflation rate of the inflation box 11, the greater the height of the lifting rod 14 in the lifting groove 13, gradually pushing the lifting groove 16 so that one end of the lifting plate 9 is lifted, and the other end rotates and swings around the rotating shaft 12, so that the water flow has resistance to flowing uphill, slowing down part of the water flow while increasing the vertical height of the water flow. The vertical cross-section of the water flow at this position is increased, and the water flow shows a trend of decelerating. The surface of the device is relatively flat and the resistance to the water flow is small. The overall operation mode of the device can be switched through the change of the flow rate of the water flow itself without the need for a driving source such as a motor. The installation is convenient and efficient, which improves the service life of the small bridge culvert outlet and is convenient to use. Example

[0032] See also Figure 1-Figure 8 Embodiment 2 is described. This embodiment further describes embodiment 1. The control mechanism 10 shown in the figure also includes a first gear 17 rotatably connected to the side stop 1. An inflation rod 18 is rotatably connected to a non-center position on the side of the first gear 17. An inflation plate 19 rotatably connected to one end of the inflation rod 18 is slidably connected in the inflation box 11. A driving member 20 is provided in the side stop 1 for linking the first gear 17 to rotate after the rotation speed of the driving shaft 5 reaches a set value. An air suction member 21 for suction is provided on the inflation box 11. A lifting member 22 for discharging gas so that the lifting rod 14 is lifted is provided on the inflation box 11.

[0033] See also Figure 4-Figure 8 The driving member 20 shown in the figure includes a driving wheel 23 coaxially fixedly installed on the upper end of the driving shaft 5, a rotating column 24 is rotatably connected in the side block 1, and a driven wheel 25 is coaxially fixedly connected to the rotating column 24. The outer wall of the driving wheel 23 is transmission-connected with a transmission belt 26 transmission-connected to the driven wheel 25, and the rotating column 24 is provided with a meshing member 27 for changing the meshing state with the first gear 17 according to the rotation speed of the rotating column 24. The meshing member 27 includes a plurality of groups of tooth blocks 28 installed on the rotating column 24, and a plurality of groups of sliding grooves 29 are evenly provided on the rotating column 24. An elastic pull rope 30 is fixedly connected in the sliding groove 29, and the plurality of groups of tooth blocks 28 are respectively slidably connected to the sliding groove 29 in the horizontal direction. One end of the elastic pull rope 30 is fixedly connected to the tooth block 28, and the tooth block 28 can mesh with the first gear 17.

[0034] In this embodiment, the fan blades 6 drive the drive shaft 5 to rotate, so that the driving wheel 23 can rotate, and the driving wheel 23 drives the transmission belt 26 to rotate the driven wheel 25, thereby driving the rotating column 24 to rotate. When the water flow is small, the rotation speed of the drive shaft 5 and the rotating column 24 is slow, and the tooth block 28 is pulled by the elastic pull rope 30 to be in the inner position of the sliding groove 29, and is not engaged with the first gear 17. As the water flow accelerates, the rotation speed of the drive shaft 5 and the rotating column 24 will increase, the rotation angular velocity of the tooth block 28 will increase, and the centrifugal force will increase, thereby throwing the tooth block 28 out, the elastic pull rope 30 will be stretched, and the tooth block 28 will extend and rotate in mesh with the first gear 17, so that The inflation rod 18 drives the inflation plate 19 to perform suction, and the gas is drawn into the inflation box 11 through the suction piece 21, and then is squeezed and pushed out by the inflation plate 19 into the lifting piece 22 to lift the lifting rod 14, thereby realizing automatic adjustment of the height of one end of the lifting plate 9. The diameter of the driving wheel 23 can be set larger than the driven wheel 25, so that the driven wheel 25 can drive the rotating column 24 to rotate faster. At the same time, the pitch circle radius of the first gear 17 can be set smaller, so that the inflation rod 18 can push and pull the inflation plate 19 more quickly, while reducing the pushing and pulling distance. The inflation plate 19 and the inner wall of the inflation box 11 are lubricated with lubricating oil to reduce friction while improving sealing. Example

[0035] See also Figure 4-Figure 10 Embodiment 3 is described. This embodiment further describes embodiment 1. The lifting member 22 shown in the figure includes an exhaust pipe 31 fixedly mounted on the inflation box 11. A one-way exhaust valve 32 is fixedly connected to the exhaust pipe 31. One end of the exhaust pipe 31 is connected to a fixed pipe 33. A lifting rod 34 is slidably connected to the fixed pipe 33 along a vertical direction. The upper end of the lifting rod 34 is fixedly connected to a connecting rod 35 fixedly connected to the side of the lifting rod 14. The fixed pipe 33 is provided with an exhaust member 36 for discharging gas.

[0036] See also Figure 4-Figure 10 The exhaust component 36 shown in the figure includes a connecting pipe 37 fixedly installed in the side guard 1 and the arch 2. The side of the fixed pipe 33 is evenly connected with multiple groups of connecting pipes 38 in the vertical direction. The multiple groups of connecting pipes 38 are all connected to the connecting pipe 37. An air supply pipe 39 for communicating with the outside air is opened in the arch 2. A filter screen 43 is fixedly connected in the air supply pipe 39. The suction component 21 includes an air intake pipe 40 connected to the charging box 11. One end of the air intake pipe 40 is connected to the air supply pipe 39. A one-way air intake valve 41 is fixedly connected in the air intake pipe 40.

[0037] In this embodiment, the one-way air intake valve 41 can be used to control the air flow in the air intake pipe 40 to flow into the air filling box 11 in one direction when the inflation plate 19 is sucking. As the inflation plate 19 is pushed, the gas is pushed out into the exhaust pipe 31 through the one-way exhaust valve 32 and enters the bottom end position of the fixed pipe 33, pushing the lifting rod 34 to move upward. During the upward movement of the lifting rod 34, the connection between the side connecting pipes 38 and the fixed pipe 33 will be opened one by one. When the air pressure is low, only a few connecting pipes 38 need to be opened to complete the exhaust. When the inflation rate increases, the gas filled in at this time is difficult to be discharged in real time through the connecting pipes 38. At this time, the lifting rod 34 will be lifted up a greater distance, thereby opening more connecting pipes 38 to complete the exhaust. The upward movement of the lifting rod 34 can enable the connecting rod 35 to drive the lifting rod 14 to move upward together. At this time, the greater the slope of the lifting plate 9 is lifted, the internal air pressure balance can be controlled by the air supply pipe 39, and the external gas can pass through the air supply pipe 39 above the dome 2 The opening enters the air pipe 39 to supply air to the air inlet pipe 40, and the gas in the connecting pipe 37 can also be discharged through the air pipe 39. The filter screen 43 can effectively filter impurities in the gas to avoid polluting the internal space of the device. Under normal circumstances, the height of the water surface will not exceed the position of the arch 2. Once the water surface is above the opening position of the air pipe 39 of the arch 2, the water surface in the culvert and the external water surface are almost in a flush state. At this time, the water flow at the position of the small culvert outlet will not produce excessive water flow impact, the fan blades 6 will not rotate rapidly, and the inflation box 11 will not continue to inflate and exhaust. A barrier (not shown) that can block the water flow but is breathable is set in the air pipe 39. Therefore, it is difficult for external water to enter the device through the air pipe 39 at this time, and there is no need to perform air supply operations at this time. The opening of the air pipe 39 can be disconnected from the outside, and the gas circulation is realized only through the gas supply inside the air pipe 39, thereby reducing the entry of external pollution.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A small bridge culvert outlet structure that is resistant to water damage. It is characterized in that include: Two groups of side guards (1), a dome (2) being fixedly connected above the two groups of side guards (1), and a bottom plate (3) being fixedly connected below the two groups of side guards (1); Also includes: A force unloading mechanism (4), the force unloading mechanism (4) comprising two groups of drive shafts (5) respectively mounted on the side guards (1) on both sides, a plurality of groups of fan blades (6) being evenly and fixedly connected to the side surfaces of the drive shafts (5), a corner groove (7) being provided on the side guard (1), the upper and lower ends of the drive shaft (5) being rotatably connected to the corner groove (7), the force unloading mechanism (4) being used for adding the fan blades (6) capable of rotatably unloading force on both sides of the outlet of the small bridge culvert, so that the impact force on the corner is guided by the rotation of the fan blades (6), thereby reducing the impact wear on the corner of the side guard (1); A lifting mechanism (8), the lifting mechanism (8) comprising a plurality of lifting plates (9) installed between the side guards (1) on both sides, the lifting mechanism (8) being used to control the lifting plates (9) to be in a horizontal state when the water flow is gentle, thereby reducing the resistance to the water flow; when the water flow increases, one end of the lifting plate (9) is gradually lifted, so that the water flow has resistance to uphill flow, and while partially reducing the water flow, the vertical height of the water flow is increased, the vertical cross-section of the water flow is increased, and the water flow shows a tendency to decelerate; A control mechanism (10), the control mechanism (10) comprising an air filling box (11) fixedly mounted in the side guard (1), the control mechanism (10) being used to drive the rotation speed of the drive shaft (5) to change through the fan blades (6), thereby changing the inflation rate of the air filling box (11), thereby causing the height of the lifting plate (9) to change accordingly; the greater the water flow, the faster the rotation speed of the drive shaft (5), the greater the inflation rate of the air filling box (11), and the greater the slope of the lifting plate (9); The lifting mechanism (8) further comprises a rotating shaft (12) fixedly mounted on the side of the lifting plate (9), the two ends of the rotating shaft (12) being rotatably connected to the side blocks (1) on both sides respectively, the side blocks (1) being provided with a lifting groove (13), a lifting rod (14) being slidably connected in the vertical direction in the lifting groove (13), a plurality of groups of lifting shafts (15) being evenly fixedly connected to the side of the lifting rod (14), lifting grooves (16) slidably connected to the lifting shafts (15) being provided on both sides of the lifting plate (9), and the control mechanism (10) being used to control the lifting state of the lifting rod (14); The control mechanism (10) further comprises a first gear (17) rotatably connected to the side block (1); an inflation rod (18) is rotatably connected to a non-center position of a side surface of the first gear (17); an inflation plate (19) rotatably connected to one end of the inflation rod (18) is slidably connected in the inflation box (11); a driving member (20) is provided in the side block (1) for rotating the first gear (17) in linkage with the rotation of the driving shaft (5) after the rotation speed reaches a set value; an air suction member (21) for air suction is provided on the inflation box (11); and a lifting member (22) for exhausting gas so that the lifting rod (14) is lifted up is provided on the inflation box (11); The driving member (20) comprises a driving wheel (23) coaxially fixedly mounted on the upper end of the driving shaft (5); a rotating column (24) is rotatably connected inside the side block (1); a driven wheel (25) is coaxially fixedly connected to the rotating column (24); a transmission belt (26) drivingly connected to the driven wheel (25) is drivingly connected to the outer wall of the driving wheel (23); and a meshing member (27) is provided on the rotating column (24) for changing a meshing state with the first gear (17) according to a rotation speed of the rotating column (24); The lifting member (22) comprises an exhaust pipe (31) fixedly mounted on the inflation box (11), a one-way exhaust valve (32) fixedly connected inside the exhaust pipe (31), one end of the exhaust pipe (31) being connected to a fixed pipe (33), a lifting rod (34) being slidably connected in a vertical direction inside the fixed pipe (33), the upper end of the lifting rod (34) being fixedly connected to a connecting rod (35) fixedly connected to a side of the lifting rod (14), and an exhaust member (36) for exhausting gas is provided on the fixed pipe (33).

2. A water-damage-resistant small bridge and culvert outlet structure according to claim 1, Features: The meshing member (27) comprises a plurality of groups of tooth blocks (28) mounted on the rotating column (24); a plurality of groups of sliding grooves (29) are evenly arranged on the rotating column (24); elastic pull ropes (30) are fixedly connected in the sliding grooves (29); the plurality of groups of tooth blocks (28) are respectively connected to the sliding grooves (29) in a sliding manner in a horizontal direction; one end of the elastic pull rope (30) is fixedly connected to the tooth block (28); and the tooth block (28) can mesh with the first gear (17).

3. A water-damage-resistant small bridge and culvert outlet structure according to claim 2, Features: The exhaust member (36) comprises a connecting pipe (37) fixedly mounted in the side baffle (1) and the arch (2); a plurality of groups of connecting pipes (38) are evenly connected to the side surface of the fixed pipe (33) in a vertical direction; the plurality of groups of connecting pipes (38) are all connected to the connecting pipe (37); and a gas transmission pipe (39) for connecting to external gas is provided in the arch (2).

4. A water-damage-resistant small bridge and culvert outlet structure according to claim 3, Features: The air intake member (21) comprises an air intake pipe (40) connected to the air charging box (11), one end of the air intake pipe (40) being connected to the air delivery pipe (39), and a one-way air intake valve (41) being fixedly connected inside the air intake pipe (40).

5. A water-damage-resistant small bridge and culvert outlet structure according to claim 1, Features: Baffles (42) for blocking the lifting slot (13) are provided at both the upper and lower ends of the lifting rod (14).

6. A water-damage-resistant small bridge and culvert outlet structure according to claim 3, Features: A filter screen (43) is fixedly connected inside the gas delivery pipe (39).

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