A small bridge culvert extension structure

Abstract

The invention discloses a small bridge and culvert extension structure, which relates to the field of bridge and culvert extension devices, and solves the problem that the inner wall of the joint of the existing small bridge and culvert extension structure cannot stably block the adhesive between the joints during the bonding process when in use, and it is difficult to ensure the continuous connection of water sources on both sides during the construction process. The structure comprises a device cylinder, a diversion mechanism, a resistance mechanism and a driving mechanism, wherein one end of the device cylinder is fixedly connected with a fixed disk, the diversion mechanism comprises a first sealing ring, one side of the first sealing ring is fixedly connected with an elastic cover, the resistance mechanism comprises a second sealing ring, and the driving mechanism comprises a sleeve pipe. The small bridge and culvert extension structure is convenient for pushing the first sealing ring to the inner wall of the bridge and culvert to unfold the elastic cover when in use, so as to guide the water flow at one end of the bridge and culvert into the device cylinder and discharge it to the other end, and when the diversion mechanism is in operation, the resistance mechanism will be linked to push the second sealing ring to the inner wall of the two groups of bridge and culvert joints, so as to achieve resistance to the inner side of the joint position and improve the construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of bridge and culvert extension devices, in particular to a small bridge and culvert extension structure. Background Art

[0002] Highway bridges and culverts are small drainage structures that cross the highway to discharge ditch water when the highway crosses the ditch. 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 Bridge and culvert classification uses two indicators, one is the single-hole span, and the other is the total length of the multi-hole span. Most of the existing small bridges and culverts are directly buried under the highway with a tubular structure. The two ends are connected to the water sources on both sides to achieve water connectivity. Due to the continuous development of urban construction, some roads will be widened on the original basis. At this time, the length of the bridge and culvert needs to be extended to ensure the connectivity of the water sources on both sides.

[0003] The existing operation mostly adopts the method of extending the original bridge culvert by connecting a new bridge culvert to the extension end. Since the bridge culvert connection needs better sealing, it is generally bonded by materials such as concrete and adhesives. This bonding process requires a certain solidification time. At this time, the water flow inside the bridge culvert needs to be blocked. During construction, the water flow can only be unblocked after the adhesive materials at the bridge culvert interface are completely bonded. During construction, the water flow is difficult to connect, which will also affect the transportation efficiency of the water sources on both sides. At the same time, since the inner wall of the bridge culvert pipe connection is in a deeper position, it is generally bonded only through the outer wall of the joint. At this time, there is no corresponding blockage on the inside of the joint, which makes it easy for the adhesive to drip directly into the bridge culvert, affecting the bonding effect of the connection. To this end, we propose a small bridge culvert extension structure. Summary of the invention

[0004] The object of the present invention is to provide a small bridge culvert extension structure which is convenient for improving construction efficiency when extending a small bridge culvert and ensuring continuous connection of water sources on both sides, 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 small bridge culvert extension structure, comprising a device tube, a diversion mechanism, a resistance mechanism and a driving mechanism, one end of the device tube is fixedly connected to a fixed disk, the diversion mechanism comprises a first sealing ring installed on the device tube, one side of the first sealing ring is fixedly connected to an elastic cover fixedly connected to the fixed disk, the diversion mechanism is used to push the first sealing ring to expand laterally until it is tightly contacted with the inner wall of the bridge culvert, so that the internal water flow enters the device tube through the diversion of the elastic cover and is discharged, the resistance mechanism comprises a second The sealing ring, the resistance mechanism is used to link the second sealing ring to expand and retract while the diversion mechanism is running, so that the second sealing ring resists the inner wall of the bridge culvert joint position, so as to prevent the adhesive from overflowing inwardly. The driving mechanism includes a sleeve tube that is slidably connected to the outer wall of the device tube in a horizontal direction. The driving mechanism is used to control the device tube to enter the inside of the bridge culvert and generate thrust on the device tube at the same time to avoid the water flow pushing the elastic cover to affect the sealing position of the second sealing ring when the diversion mechanism is running, so as to improve the construction efficiency when extending the small bridge culvert and ensure the continuous connection of the water sources on both sides.

[0006] Preferably, the diversion mechanism also includes a threaded rod installed on the fixed plate, the threaded rod passes through the fixed plate and is threadedly connected to the fixed plate, one end of the threaded rod is rotatably connected to a mounting frame, the inner wall of the first sealing ring is evenly and fixedly connected to a plurality of groups of first push blocks, and the mounting frame is rotatably connected to a plurality of groups of first push rods rotatably connected to the first push blocks, thereby ensuring continuous connectivity of water sources on both sides during construction.

[0007] Preferably, the resistance mechanism also includes a plurality of groups of second push blocks evenly and fixedly installed on the inner wall of the second sealing ring, the second push block is fixedly connected to a guide rod, the outer wall of the guide rod is sleeved with a guide sleeve, the guide sleeve passes through the device tube and is slidably connected to the device tube, one end of the guide sleeve is fixedly connected to a first spring fixedly connected to the second push block, and the device tube is provided with a plurality of groups of pushing members for respectively driving the second push block to open and close, so as to facilitate the resistance to the inner wall at the joint position.

[0008] Preferably, the pushing member includes a first slider and a second slider slidingly connected to the side surface of the device cylinder, the first slider and the second slider are symmetrically distributed on both sides of the guide sleeve, the first slider and the second slider are rotatably connected to a second push rod rotatably connected to the second push block, and the mounting frame is provided with a sliding member for driving the first slider and the second slider to slide toward each other synchronously, so as to facilitate driving the second push block to open and close respectively.

[0009] Preferably, the sliding member includes a push-pull rod fixedly mounted on the first sliding member, the push-pull rod passes through the second sliding member and the fixed plate, and is slidably connected to the second sliding member and the fixed plate, the push-pull rod is fixedly connected to the mounting frame at one end away from the first sliding member, a push-pull groove is provided on the push-pull rod, the guide sleeve passes through the push-pull groove and is movably connected to the push-pull groove, and the first sliding member is provided with a synchronization member for driving the second sliding member to push and pull synchronously, so as to facilitate driving the first sliding member and the second sliding member to slide toward each other synchronously.

[0010] Preferably, the synchronization component includes a first tension spring fixedly installed on the side of the second slider, the first tension spring is fixedly connected to the fixed plate, a pull rope is fixedly connected to the first slider, a guide wheel is rotatably connected to the device cylinder, the side of the pull rope is rollingly connected to the outer wall of the guide wheel, and the end of the pull rope away from the first slider is fixedly connected to the second slider, so as to drive the second slider to push and pull synchronously.

[0011] Preferably, the driving mechanism also includes a driving rod coaxially fixedly installed on one end of the threaded rod, and a driving sleeve is rotatably connected in the sleeve and slidably connected to the outer wall of the driving rod in a horizontal direction. The sleeve is provided with a limit member for limiting the stretching length of the device tube, which is convenient for controlling the device tube to enter the interior of the culvert and generate thrust on the device tube.

[0012] Preferably, the limiting member includes a device disk fixedly mounted on one end of the sleeve, a plurality of groups of limiting grooves are evenly arranged in the device disk, a clamping block is slidably connected in the limiting groove, a plurality of groups of oblique tooth grooves that can be clamped with the clamping block are evenly arranged on the outer wall of the device tube, a second spring fixedly connected to the limiting groove is fixedly connected to one end of the clamping block, and a releasing member for releasing the clamping state of the clamping block and the oblique tooth groove is provided on the sleeve, so as to facilitate limiting the stretching length of the device tube.

[0013] Preferably, the releasing member comprises a rotating cylinder rotatably connected to the outer wall of the sleeve, one end of the rotating cylinder is coaxially fixedly connected to a rotating ring rotatably connected to the device disk, the side of the clamping block is fixedly connected to a control shaft, and the rotating ring is provided with an arc groove slidably connected to the control shaft, so as to facilitate the release of the clamping state between the clamping block and the bevel tooth groove.

[0014] Preferably, one end of the driving sleeve is fixedly connected to a guide cover to prevent the hand from being impacted by the water flow discharged from the sleeve tube when the driving sleeve is rotated.

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

[0016] The present invention solves the problem that the inner wall of the joint cannot stably block the adhesive between the joints during the bonding process of the existing small bridge culvert extension structure, and it is difficult to ensure the continuous connection of water sources on both sides during the construction process. By arranging the diversion mechanism, the resistance mechanism and the driving mechanism, it is convenient to push the first sealing ring to the inner wall around the bridge culvert during use, so as to unfold the elastic cover, guide the water flow at one end of the bridge culvert into the device cylinder, and discharge it to the other end. When the diversion mechanism is running, the resistance mechanism will be linked to push the second sealing ring to the inner wall of the two groups of bridge culvert joints, so as to achieve resistance to the inner side of the joint position, so as to prevent the adhesive from flowing into the joint through the joint during subsequent sealing. The inner wall of the bridge culvert is affected by the bonding effect. At the same time, the driving mechanism can be used to extend and retract the positions of the first sealing ring and the second sealing ring to align the second sealing ring with the joint position, thereby avoiding the impact of the water flow on the position of the second sealing ring. The diversion mechanism is used to ensure that the joint position will not be impacted by a large amount of water flow during the construction process, thereby improving the adhesion effect of the adhesive and ensuring that the water sources at both ends are in a connected flow state during construction, thereby having little impact on water flow transportation. The device is simple and quick to operate, can be freely extended and folded, and is suitable for use with bridges and culverts of various diameters, thereby improving construction efficiency and facilitating 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 for Figure 1 A magnified image of area A;

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

[0020] Figure 4 for Figure 3 Enlarged view of area B;

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

[0022] Figure 6 for Figure 5 Enlarged view of area C in the middle;

[0023] Figure 7 for Figure 5 Enlarged view of area D in the middle;

[0024] Figure 8 It is a schematic diagram of the structure of the driving mechanism of the present invention;

[0025] Fig. 9 for Figure 8 Enlarged view of area E in the middle;

[0026] Fig.10 It is a schematic diagram of the structure of the conflict mechanism of the present invention;

[0027] Fig.11 for Fig.10 Enlarged view of area F.

[0028] In the figure: 1-device cylinder; 2-fixed plate; 3-guiding mechanism; 4-first sealing ring; 5-elastic cover; 6-contact mechanism; 7-second sealing ring; 8-driving mechanism; 9-sleeve pipe; 10-threaded rod; 11-mounting frame; 12-first push block; 13-first push rod; 14-second push block; 15-guide rod; 16-guide sleeve; 17-first spring; 18-pushing member; 19-first slider; 20-second slider; 21-first Two push rods; 22-sliding member; 23-push-pull rod; 24-push-pull groove; 25-synchronizing member; 26-first tension spring; 27-pull rope; 28-guide wheel; 29-driving rod; 30-driving sleeve; 31-limiting member; 32-device disk; 33-limiting groove; 34-clamping block; 35-oblique tooth groove; 36-second spring; 37-releasing member; 38-rotating cylinder; 39-rotating ring; 40-control shaft; 41-arc groove; 42-guide cover. Implementation

[0029] 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

[0030] See also Figure 1-Figure 4 , a small bridge culvert extension structure shown in the figure includes a device tube 1, a diversion mechanism 3, a resistance mechanism 6 and a driving mechanism 8. One end of the device tube 1 is fixedly connected to a fixed disk 2. The diversion mechanism 3 includes a first sealing ring 4 installed on the device tube 1. One side of the first sealing ring 4 is fixedly connected to an elastic cover 5 fixedly connected to the fixed disk 2. The diversion mechanism 3 is used to push the first sealing ring 4 to expand laterally until it is tightly contacted with the inner wall of the bridge culvert, so that the internal water flow enters the device tube 1 through the diversion of the elastic cover 5 and is discharged. The resistance mechanism 6 includes an installation The second sealing ring 7 on the device tube 1, the resistance mechanism 6 is used to link the second sealing ring 7 to expand and retract while the diversion mechanism 3 is running, so that the second sealing ring 7 is in contact with the inner wall of the bridge culvert joint position, so as to prevent the adhesive from overflowing inward. The driving mechanism 8 includes a sleeve tube 9 that is slidably connected to the outer wall of the device tube 1 in the horizontal direction. The driving mechanism 8 is used to control the device tube 1 to enter the inside of the bridge culvert and generate thrust on the device tube 1 to avoid the water flow pushing the elastic cover 5 to affect the sealing position of the second sealing ring 7 when the diversion mechanism 3 is running.

[0031] See also Figure 1-Figure 7 The guide mechanism 3 shown in the figure also includes a threaded rod 10 installed on the fixed disk 2. The threaded rod 10 passes through the fixed disk 2 and is threadedly connected to the fixed disk 2. One end of the threaded rod 10 is rotatably connected to a mounting frame 11. The inner wall of the first sealing ring 4 is evenly fixedly connected with multiple groups of first push blocks 12. The mounting frame 11 is rotatably connected with multiple groups of first push rods 13 that are respectively rotatably connected to the first push blocks 12.

[0032] In this embodiment, when in use, the device tube 1 is pushed to the joint position between the two groups of bridge culverts by the driving mechanism 8, and the joint is observed to determine that when the second sealing gasket reaches the joint, the threaded rod 10 is driven to rotate by the driving mechanism 8, so that the mounting frame 11 is pushed out, and the mounting frame 11 pushes the first push rod 13 so that the first push block 12 gradually pushes the first sealing ring 4 on all sides. Under the pull of the elastic cover 5, the first sealing ring 4 drives one end of the elastic cover 5 to expand outward together until the first sealing ring 4 is tightly in contact with the inner wall of the bridge culvert on all sides. The first sealing ring 4 and the second sealing ring 7 are both made of elastic rubber and have a large thickness, which ensures that they can be squeezed when they are in contact with the bridge culvert, reducing the gap and improving the sealing performance. The water flow at one end of the bridge culvert is introduced into the device tube 1 and discharged to the other end. When the mounting frame 11 moves, it will be linked to contact The mechanism 6 pushes the second sealing ring 7 to the inner wall of the joints of the two groups of bridge culverts to achieve resistance to the inner side of the joint position, thereby preventing the adhesive from flowing into the inner wall of the bridge culvert through the joint during subsequent sealing and affecting the bonding effect. At the same time, the driving mechanism 8 enables the first sealing ring 4 and the second sealing ring 7 to be telescopically adjusted to align the second sealing ring 7 with the joint position to avoid affecting the position of the second sealing ring 7 under the impact of the water flow. The diversion of the device tube 1 ensures that the joint position will not be impacted by a large amount of water flow during the construction process, thereby improving the adhesion effect of the adhesive. At the same time, it also ensures that the water sources at both ends are in a connected flow state during construction, thereby having little impact on water flow transportation. The device is simple and quick to operate, can be freely telescopic and folded, and is suitable for bridges and culverts of various diameters, thereby improving construction efficiency and facilitating use. Example

[0033] See also Figure 1-Figure 11Embodiment 2 is described. This embodiment further describes Embodiment 1. The interference mechanism 6 shown in the figure also includes a plurality of second push blocks 14 uniformly fixedly mounted on the inner wall of the second sealing ring 7. A guide rod 15 is fixedly connected to the second push block 14. A guide sleeve 16 is sleeved on the outer wall of the guide rod 15. The guide sleeve 16 penetrates the device tube 1 and is slidably connected to the device tube 1. One end of the guide sleeve 16 is fixedly connected to a first spring 17 fixedly connected to the second push block 14. The device tube 1 is provided with a plurality of push members 18 for driving the second push block 14 to open and close respectively. The push member 18 includes a first slider 19 and a second slider 20 slidably connected to the side of the device tube 1. The first slider 19 and the second slider 20 are symmetrically distributed on both sides of the guide sleeve 16. The first slider 19 and the second slider 20 are both rotatably connected to a second push rod 21 rotatably connected to the second push block 14. The mounting frame 11 is provided with a sliding member 22 for driving the first slider 19 and the second slider 20 to slide synchronously toward each other.

[0034] See also Figure 8-Figure 11 The sliding member 22 shown in the figure includes a push-pull rod 23 fixedly mounted on the first slider 19, the push-pull rod 23 passes through the second slider 20 and the fixed plate 2, and is slidably connected to the second slider 20 and the fixed plate 2, the push-pull rod 23 is fixedly connected to the mounting frame 11 at one end away from the first slider 19, a push-pull groove 24 is provided on the push-pull rod 23, the guide sleeve 16 passes through the push-pull groove 24, and is movably connected to the push-pull groove 24, the first slider 19 is provided with a synchronization member 25 for driving the second slider 20 to push and pull synchronously, the synchronization member 25 includes a first tension spring 26 fixedly mounted on the side of the second slider 20, the first tension spring 26 is fixedly connected to the fixed plate 2, a pull rope 27 is fixedly connected to the first slider 19, a guide wheel 28 is rotatably connected to the device cylinder 1, the side of the pull rope 27 is rollingly connected to the outer wall of the guide wheel 28, and the end of the pull rope 27 away from the first slider 19 is fixedly connected to the second slider 20.

[0035] In this embodiment, when the mounting frame 11 moves, the push-pull rod 23 on the side will be driven to pull the first slider 19 to move. When the first slider 19 moves, the pull rope 27 will be pulled to make the second slider 20 slide synchronously to the side of the first slider 19. The guide wheel 28 here is a fixed pulley, which ensures that the movement distance of the second slider 20 is the same when the first slider 19 moves. At this time, the first tension spring 26 is stretched, and the first slider 19 and the second slider 20 push out the second push rods 21 on both sides respectively. The second push block 14 opens the second sealing ring 7 and contacts the inner wall of the culvert. By setting the guide rod 15 and the guide sleeve 16, it is ensured that when the second sealing ring 7 is opened, the expansion position of the second sealing ring 7 is always in the originally set position and expands synchronously to the surrounding areas. To prevent the position of the second sealing ring 7 from being offset during the expansion process, after the sealing is completed, the threaded rod 10 can be operated in the reverse direction to pull the mounting frame 11 in the reverse direction, and the first sealing ring 4 and the second sealing ring 7 rebound so that the horizontal angle between the first push rod 13 and the second push rod 21 and the threaded rod 10 gradually decreases and tends to be parallel. When the mounting frame 11 moves back, it will drive the push rod to push the first slider 19 in the reverse direction to slide, and the pull rope 27 gradually reduces the pulling on the second slider 20. The first tension spring 26 pulls back so that the first slider 19 and the second slider 20 slide in the reverse direction synchronously, and the second sealing ring 7 is gradually retracted to fit the side of the device tube 1 to complete the overall storage. At the same time, it is also convenient to adapt to bridges and culverts with different inner diameters within a certain range for extension and use, and the operation is convenient and efficient. Example

[0036] See also Figure 1-Figure 11 Embodiment 3 is described. This embodiment further describes Embodiment 1. The driving mechanism 8 shown in the figure also includes a driving rod 29 coaxially fixedly mounted on one end of the threaded rod 10. A driving sleeve 30 is rotatably connected in the sleeve 9 and is horizontally slidably connected to the outer wall of the driving rod 29. A guide cover 42 is fixedly connected to one end of the driving sleeve 30. A limiting member 31 is provided on the sleeve 9 for limiting the stretching length of the device tube 1.

[0037] See also Figure 1-Figure 7 The limiting member 31 shown in the figure includes a device disk 32 fixedly installed on one end of the sleeve tube 9, and a plurality of groups of limiting grooves 33 are evenly arranged in the device disk 32, and a clamping block 34 is slidably connected in the limiting groove 33. The outer wall of the device tube 1 is evenly provided with a plurality of groups of oblique tooth grooves 35 that can be clamped with the clamping block 34, and one end of the clamping block 34 is fixedly connected to a second spring 36 fixedly connected to the limiting groove 33. The sleeve tube 9 is provided with a releasing member 37 for releasing the clamping state of the clamping block 34 and the oblique tooth groove 35. The releasing member 37 includes a rotating cylinder 38 rotatably connected to the outer wall of the sleeve tube 9, and one end of the rotating cylinder 38 is coaxially fixedly connected to a rotating ring 39 rotatably connected to the device disk 32, and a control shaft 40 is fixedly connected to the side of the clamping block 34, and an arc groove 41 slidably connected to the control shaft 40 is provided on the rotating ring 39.

[0038] In this embodiment, during operation, the sleeve tube 9 is first pulled out of the device tube 1, and the clamping block 34 is continuously slid and clamped in the oblique tooth groove 35. After moving to the set position, the clamping block 34 completes the one-way clamping. Thereafter, the device tube 1 and the sleeve tube 9 are pushed into the interior of the bridge culvert as a whole, and the position of the second sealing ring 7 is observed through the joint until it is aligned. The drive sleeve 30 will slide on the outer wall of the drive rod 29 when it is unfolded. When the threaded rod 10 needs to be rotated, it is only necessary to rotate one end of the drive sleeve 30 to drive the drive sleeve 30 to rotate, so that the drive rod 29 drives the threaded rod 10 to rotate together. The forward or backward movement of the threaded rod 10 will not affect the sleeve sliding relationship between the drive rod 29 and the drive sleeve 30. As the first sealing ring 4 expands, the water The water will gradually be discharged from the device tube 1 and the sleeve tube 9. At this time, it will flow out from the side through the guide of the guide cover 42 to prevent the water flow from directly impacting the rotating position of the hand. At this time, a certain force is required to resist one end of the sleeve tube 9 to prevent the water flow impact from affecting the sealing position of the second sealing ring 7. When the extension operation is completed, the driving sleeve 30 can be rotated in the reverse direction to retract the threaded rod 10 into the device tube 1. The rotating tube 38 drives the rotating ring 39 to rotate. The arc groove 41 drives the control shaft 40 to slide, thereby driving the clamping block 34 to slide synchronously around, releasing the clamping of the oblique tooth groove 35. At this time, the sleeve tube 9 can be slid in the reverse direction to the outside of the device tube 1 to complete the shrinkage and storage, which is convenient for later carrying and transportation.

[0039] 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.

[0040] 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 extension structure, It is characterized in that include: A device cylinder (1), one end of the device cylinder (1) being fixedly connected to a fixing plate (2); Also includes: A flow guiding mechanism (3), the flow guiding mechanism (3) comprising a first sealing ring (4) mounted on the device tube (1), one side of the first sealing ring (4) being fixedly connected to an elastic cover (5) fixedly connected to the fixed plate (2), the flow guiding mechanism (3) being used to push the first sealing ring (4) to expand laterally until it is in close contact with the inner wall of the bridge culvert, so that the internal water flow enters the device tube (1) through the guidance of the elastic cover (5) and is discharged; a resistance mechanism (6), the resistance mechanism (6) comprising a second sealing ring (7) mounted on the device tube (1), the resistance mechanism (6) being used to link the second sealing ring (7) to expand and retract while the diversion mechanism (3) is running, so that the second sealing ring (7) resists the inner wall of the bridge culvert joint position, thereby preventing the adhesive from overflowing inwards; A driving mechanism (8), the driving mechanism (8) comprising a sleeve tube (9) slidably connected to the outer wall of the device tube (1) in a horizontal direction, the driving mechanism (8) being used to control and push the device tube (1) into the interior of the bridge culvert, while generating thrust on the device tube (1) to prevent the water flow from pushing the elastic cover (5) and affecting the sealing position of the second sealing ring (7) when the diversion mechanism (3) is in operation; The flow guide mechanism (3) further comprises a threaded rod (10) mounted on the fixed disk (2), the threaded rod (10) passing through the fixed disk (2) and being threadedly connected to the fixed disk (2), one end of the threaded rod (10) being rotatably connected to a mounting frame (11), a plurality of groups of first push blocks (12) being evenly and fixedly connected to the inner wall of the first sealing ring (4), and a plurality of groups of first push rods (13) being rotatably connected to the mounting frame (11) and respectively rotatably connected to the first push blocks (12); The abutment mechanism (6) further comprises a plurality of second push blocks (14) uniformly fixedly mounted on the inner wall of the second sealing ring (7); the second push block (14) is fixedly connected to a guide rod (15); the outer wall of the guide rod (15) is sleeved with a guide sleeve (16); the guide sleeve (16) passes through the device tube (1) and is slidably connected to the device tube (1); one end of the guide sleeve (16) is fixedly connected to a first spring (17) fixedly connected to the second push block (14); and the device tube (1) is provided with a plurality of push members (18) for respectively driving the second push block (14) to open and close. The pushing member (18) comprises a first slider (19) and a second slider (20) which are slidably connected to the side of the device cylinder (1); the first slider (19) and the second slider (20) are symmetrically distributed on both sides of the guide sleeve (16); the first slider (19) and the second slider (20) are both rotatably connected to a second push rod (21) which is rotatably connected to the second push block (14); and the mounting frame (11) is provided with a sliding member (22) for driving the first slider (19) and the second slider (20) to slide synchronously towards each other; The sliding member (22) comprises a push-pull rod (23) fixedly mounted on the first sliding block (19); the push-pull rod (23) passes through the second sliding block (20) and the fixed plate (2) and is slidably connected to the second sliding block (20) and the fixed plate (2); one end of the push-pull rod (23) away from the first sliding block (19) is fixedly connected to the mounting frame (11); a push-pull groove (24) is provided on the push-pull rod (23); the guide sleeve (16) passes through the push-pull groove (24) and is movably connected to the push-pull groove (24); and a synchronizing member (25) for driving the second sliding block (20) to perform synchronous pushing and pulling is provided on the first sliding block (19); The synchronization member (25) includes a first tension spring (26) fixedly mounted on the side of the second slider (20), the first tension spring (26) being fixedly connected to the fixed disk (2), a pull rope (27) being fixedly connected to the first slider (19), a guide wheel (28) being rotatably connected to the device cylinder (1), a side of the pull rope (27) being rollingly connected to an outer wall of the guide wheel (28), and an end of the pull rope (27) away from the first slider (19) being fixedly connected to the second slider (20).

2. A small bridge and culvert extension structure according to claim 1, Features: The driving mechanism (8) further comprises a driving rod (29) coaxially fixedly mounted on one end of the threaded rod (10); a driving sleeve (30) is rotatably connected in the sleeve tube (9) and is slidably connected to the outer wall of the driving rod (29) in a horizontal direction; and a limiting member (31) is provided on the sleeve tube (9) for limiting the stretching length of the device tube (1).

3. A small bridge and culvert extension structure according to claim 2, Features: The limiting member (31) comprises a device plate (32) fixedly mounted on one end of the sleeve tube (9), a plurality of groups of limiting grooves (33) are evenly arranged in the device plate (32), a clamping block (34) is slidably connected in the limiting grooves (33), a plurality of groups of oblique tooth grooves (35) capable of being clamped with the clamping block (34) are evenly arranged on the outer wall of the device tube (1), a second spring (36) fixedly connected to the limiting groove (33) is fixedly connected to one end of the clamping block (34), and a releasing member (37) for releasing the clamping state between the clamping block (34) and the oblique tooth groove (35) is provided on the sleeve tube (9).

4. A small bridge and culvert extension structure according to claim 3, Features: The release member (37) comprises a rotating cylinder (38) rotatably connected to the outer wall of the sleeve tube (9); one end of the rotating cylinder (38) is coaxially fixedly connected to a rotating ring (39) rotatably connected to the device disk (32); a control shaft (40) is fixedly connected to the side of the clamping block (34); and an arc groove (41) is formed on the rotating ring (39) and is slidably connected to the control shaft (40).

5. A small bridge and culvert extension structure according to claim 2, Features: One end of the driving sleeve (30) is fixedly connected to a guide cover (42).

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