A pipeline butt joint device for hydraulic engineering

Abstract

A pipe docking device for water conservancy projects, relating to the field of pipe docking in water conservancy projects, includes at least three support vehicles. Each support vehicle includes a chassis with wheels connected to its bottom, a frame connected to the chassis, a winch connected to the chassis, and a fixed pulley connected to the top of the frame. The winch's rope passes over the fixed pulley and connects to a hanger. Symmetrical rack plates are connected to the bottom of the hanger, and supports are connected to the rack plates. A mounting base is connected to the bottom of the hanger, and a dual-shaft motor is mounted on the mounting base. Rotating shafts are connected to the output shafts on both sides of the dual-shaft motor. Lugs are connected to the bottom of the hanger, and gears are rotatably connected to the lugs. The gears are keyed to the rotating shafts and mesh with the rack plates. This pipe docking device provides sufficient operating space, eliminates the need for foundation excavation, improves docking efficiency, and has a simple overall structure, meeting the complex requirements of on-site construction environments in water conservancy projects.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering, and more specifically to a pipe connection device for water conservancy projects. Background Technology

[0002] Pipeline connection technology in water conservancy projects is a key link to ensure the safe operation of water conveyance, drainage, irrigation and other systems. In water conservancy projects, steel corrugated pipes are widely used in drainage, sewage discharge and water conveyance scenarios due to their high ring stiffness, corrosion resistance, light weight and convenient construction.

[0003] In water conservancy projects, corrosion protection and sealing of steel corrugated pipe joints are crucial for ensuring the long-term stable operation of pipelines. Heat shrink sleeves, as a highly efficient protective technology, are widely used for corrosion protection, waterproofing, and mechanical protection at the joints of steel corrugated pipes. They generally consist of: a base material, radiation-crosslinked polyolefin, with high weather resistance and UV resistance; an inner layer, hot melt adhesive (EVA or butyl rubber), which melts at high temperatures and bonds tightly to the pipe surface; and a reinforcing layer, a fiberglass or aluminum foil interlayer, used to enhance resistance to mechanical damage. Through heating (120~150℃), the base material shrinks (shrinkage rate 30%~50%), tightly wrapping the pipe joint, while the hot melt adhesive melts and fills surface pores, forming a seamless waterproof and corrosion-resistant layer.

[0004] When connecting heat shrink sleeves to pipes, the process is as follows: Pipe joint pretreatment: Surface treatment, using a wire brush or sandpaper to polish the joint area to remove oxide layers and oil stains; Preheating and dehumidification: Use a flame gun to evenly heat the pipe surface to 50~60℃ to evaporate moisture; Heat shrink sleeve installation: Slide the heat shrink sleeve onto the joint, centering it and overlapping the pipe body on both sides, using positioning tape for temporary fixation to prevent displacement; Heating and shrinking: Heating in sections, moving the flame evenly from the middle to both ends or from one end to the other (avoiding local overheating), first heating the middle of the shrink sleeve to eliminate wrinkles, then extending to both sides to ensure the substrate is completely shrunk and adhered, heating the edges until hot melt adhesive overflows to form an "adhesive line"; Pressing and compacting: Use a roller or a hand wearing high-temperature gloves to press the shrink sleeve to remove air bubbles and ensure tight contact between the adhesive layer and the pipe; Cooling and inspection: Allow the pipe to move only after it has cooled naturally to below 40℃.

[0005] In existing technology, steel corrugated pipes are hoisted and placed in a foundation pit using a hoisting system. The foundation is flat, with a 10-20cm sand cushion layer laid. During pipe connection, the foundation at the connection point needs to be excavated to a certain depth to allow for the connection operation. After the heating and shrinkage connection is completed, the foundation is backfilled. The current connection method requires a relatively deep excavation to allow sufficient space for the flame gun to heat the pipes, resulting in low overall connection efficiency.

[0006] This invention provides a pipe docking device for water conservancy projects, which is laid horizontally on both sides of the foundation pit to support the ends of the two pipes to be docked, suspends the docking ends on the foundation, and leaves the operating space required by the construction personnel to improve docking efficiency. Summary of the Invention

[0007] In response to the problems raised in the background art, the present invention provides a pipe connection device for water conservancy projects to solve them, and the present invention will be further described below.

[0008] A pipe connection device for water conservancy projects includes at least three sets of support vehicles. Each support vehicle includes a chassis with wheels connected to the bottom of the chassis, a frame connected to the chassis, a winch connected to the chassis, a fixed pulley connected to the top of the frame, and a hanger connected to the winch's rope after passing over the fixed pulley. Symmetrical rack plates are connected to the bottom of the hanger, and a support is connected to the rack plate. A mounting base is connected to the bottom of the hanger, and a dual-shaft motor is mounted on the mounting base. Rotating shafts are connected to the output shafts on both sides of the dual-shaft motor. Lugs are connected to the bottom of the hanger, and gears are rotatably connected to the lugs. The gears are keyed to the rotating shafts and mesh with the rack plates.

[0009] Preferably, two sets of supports of equal height are provided along the axial direction of the pipe. The arrangement of the two sets of supports ensures a high degree of straightness at the pipe connection end, thereby guaranteeing the installation accuracy of the heat shrink sleeve.

[0010] Preferably, a sliding plate is slidably mounted on the bottom of the hanger, with a pressure seat connected to the end of the sliding plate. Both the pressure seat and the support are arc plates adapted to the pipe. An end plate is connected to the end of the sliding plate opposite to the pressure seat. A positioning shaft is connected between the end plate and the hanger, and a first spring is sleeved on the positioning shaft. The two ends of the first spring contact the end plate and the hanger, respectively. A guide frame is connected to the frame, and the guide frame has a guide groove, which includes a connecting oblique groove and a vertical groove. A sliding column is connected to the side of the end plate, and the sliding column is located in the guide groove. During the descent of the hoisted pipe, the sliding column first acts on the oblique groove of the guide frame at a fixed height, and finally presses tightly against the outer wall of the pipe. At the same time, under the elastic force of the first spring, the pressure seat and the support clamp the pipe, maintaining the roundness of the pipe. The first spring maintains a constant compression, which not only ensures the purpose of maintaining the roundness of the pipe, but also avoids damage to the pipe.

[0011] This invention utilizes three sets of support vehicles to achieve continuous pipeline docking operations. One end of the current pipeline has already been docked, and the end to be docked with the subsequent pipeline is placed on the current support vehicle. The next support vehicle is placed in the pit at a distance equal to the length of a section of pipeline, away from the previous support vehicle. The subsequent pipeline is hoisted and placed between the previous and next support vehicles, with both ends of the subsequent pipeline suspended at a certain height above the foundation. The current and subsequent pipelines are docked using heat-shrink sleeves. After docking, the current and subsequent support vehicles release the current and subsequent pipelines. At this point, both ends of the current pipeline are docked. The current and subsequent support vehicles can then be moved backward, and a new pipeline can be hoisted. This process is repeated to complete the docking operation.

[0012] Preferably, a docking cylinder is connected to one side of the top of the frame, and a docking shaft is connected to the other side. A second guide frame is connected to the docking shaft, and a positioning rod is slidably connected between the second guide frames. A pin is connected to the bottom of the positioning rod, and pin holes are provided on the docking cylinder and the docking shaft. By simultaneously engaging the pin in the pin holes on the docking cylinder and the docking shaft, the two sets of support vehicles are temporarily locked into one support vehicle group. At this time, the support vehicle group can be rotated, and the center of gravity of the support vehicle group is always on the base, so the support vehicle group can be directly pulled across the foundation pit.

[0013] Preferably, the chassis has a slot, within which a rod slides, and a lever is connected to the rod, penetrating the slot. Both the chassis and the rod have insertion holes, and locking rods are installed at these holes. Redundant reinforcement of the support vehicle assembly ensures its strength when crossing the pit. When not forming a support vehicle assembly, the rod is internally housed in the slot on the chassis, and the locking rod extends into the slot, limiting its movement and preventing it from slipping out. When temporary interlocking of the support vehicle assembly is required, the rod of one support vehicle is inserted into the slot of another until the insertion holes on the chassis and the rod coincide, and then the locking rod is inserted into the insertion hole, achieving redundant locking of the support vehicle assembly.

[0014] Preferably, the insert rod of the support vehicle is pushed out of the slot and inserted into the slot of another support vehicle. When it stops against the locking rod of the other support vehicle, the insertion holes on the chassis of the support vehicle and the insert rod coincide. The aim is that after the upper part of the support vehicle is locked, simply pushing the bottom insert rod against the locking rod inside the other support vehicle will make the insertion holes on the chassis and the insert rod coincide.

[0015] Preferably, the system also includes a positioning component. The bottom of the frame has a clearance groove. The positioning component includes a screw rotatably mounted within the clearance groove. One end of the screw, passing through the clearance groove, is connected to a nut. An adjusting rod is threaded onto the screw, and a positioning element is mounted on the adjusting rod. When hoisting the pipe, adjusting the position only requires rotating the nut to adjust the position of the positioning element. Hoisting the pipe only requires raising its lower end to the height of the support, then moving it horizontally towards the positioning element until the end of the pipe abuts against the positioning element. Furthermore, the distance between the two support vehicles is fixed after locking, requiring only one adjustment to the position of the positioning element; subsequent adjustments are unnecessary.

[0016] Preferably, the positioning assembly also has two sets symmetrical about the hanger in the direction of the pipe axis. The positioning component is slidably mounted on the adjusting rod. One end of the positioning component is connected to a limit cap, and the other end is connected to a stop circle. The positioning component is equipped with a second spring, and the two ends of the second spring contact the adjusting rod and the stop circle, respectively. When the position of the adjusting rod is adjusted, the pipe is hoisted. When the pipe is lowered to the height of the support, it first contacts the stop circle away from the docking end. By pressing the stop circle, the positioning component retracts to avoid being positioned.

[0017] Preferably, the stop circle has a rounded edge. When the pipe surface has corrugations, the pipe can move between the corrugations during horizontal hoisting and lateral movement by using the rounded edge.

[0018] Beneficial Effects: Compared with existing technologies, the pipe docking device of this invention allows for cyclic docking of pipes within the foundation pit using three sets of support vehicles. Any two sets suspend the two pipes to be docked in a certain space above the foundation. These two sets of support vehicles are locked together by a redundant interlocking mechanism, achieving structural stability. Based on this, it can assist in the one-time hoisting of the pipes during lifting, meeting the dimensional requirements for heat shrink sleeve installation. Simultaneously, the locked two sets of support vehicles can rotate together and cross the foundation pit, facilitating movement. The support vehicles are equipped with pressure seats. During pipe hoisting, as the pipe moves downwards, the pressure seats activate to press firmly against the outer wall of the pipe. Connecting supports clamp the pipe, maintaining its roundness. Simultaneously, two sets of supports in the axial direction maintain the straightness of the pipe. Thus, the pipe docking device of this invention provides sufficient operating space, eliminates the need for foundation excavation, improves docking efficiency, and has a simple overall structure, meeting the complex requirements of the actual construction environment in water conservancy projects. Attached Figure Description

[0019] Figure 1 : A schematic diagram of the support vehicle of the present invention;

[0020] Figure 2 Another structural schematic diagram of the support vehicle of the present invention;

[0021] Figure 3 : Figure 2 Enlarged schematic diagram of the structure at point A;

[0022] Figure 4 : A schematic diagram of two sets of support vehicles locked together to form a support vehicle group;

[0023] Figure 5 : Figure 4 Enlarged schematic diagram of the structure at point B;

[0024] Figure 6 : A diagram illustrating the effect of using the pipe connection device of this invention for pipe circulation connection;

[0025] In the diagram: 1. Support vehicle; 2. Chassis; 3. Wheel; 4. Frame; 401. Alternating groove; 5. Winch; 6. Fixed pulley; 7. Hanger; 8. Rack plate; 9. Support; 10. Pipe; 11. Mounting seat; 12. Dual-shaft motor; 13. Rotating shaft; 14. Support lug; 15. Gear; 16. Pressure seat; 17. Slide plate; 18. End plate; 19. Positioning shaft; 20. First spring; 21. Guide frame; 211. Inclined groove; 212. Vertical groove; 22. Sliding column; 23. Connecting cylinder; 24. Connecting shaft; 25. Second guide frame; 26. Positioning rod; 27. Pin; 28. Insert rod; 29. ​​Toggle rod; 30. Positioning component; 31. Screw; 32. Rotary cap; 33. Adjusting rod; 34. Limit cap; 35. Stop circle; 36. Second spring; 37. Detailed Implementation

[0026] Next, we will combine the appendix Figures 1-6 A specific embodiment of the present invention will be described in detail below.

[0027] Reference Appendix Figures 1-3 A pipe docking device for water conservancy projects includes at least two sets of support vehicles 1. Each support vehicle 1 includes a chassis 2, wheels 3 connected to the bottom of the chassis 2, a frame 4 connected to the chassis 2, a winch 5 connected to the chassis 2, a fixed pulley 6 connected to the top of the frame 4, and a hanger 7 whose winding rope of the winch 5 passes around the fixed pulley 6. A symmetrical rack plate 8 is connected to the bottom of the hanger 7, and a support 9 is connected to the rack plate 8. The symmetrical support 9 is used to support the pipe 10 to be docked.

[0028] In use, two sets of support vehicles 1 are placed horizontally on both sides of the foundation pit, and two sets of symmetrical support seats 9 are placed close to each other. The two sets of pipes 10 to be connected are lifted by the hoisting system and transferred to the support seats 9, gradually transferring the weight of the pipes onto the support seats. Then, the pipes are gradually lowered, and the weight of the pipes will gradually press down on the support seats 9, in conjunction with the release of the winch 5, until they stop at a certain height above the foundation. This makes the connecting ends of the pipes close together and suspended on the foundation, leaving space for cleaning the pipe ends, installing heat shrink sleeves, and heat treatment. At this time, the non-connecting ends of the pipes are placed directly on the foundation.

[0029] Given that the pipe has sufficient length and a certain degree of toughness, and the joint end can be suspended at a short height on one side, in this embodiment, two sets of supports 9 are provided in the axial direction of the pipe 10. The arrangement of the two sets of supports ensures that the pipe joint end has a high degree of straightness, thus guaranteeing the installation accuracy of the heat shrink sleeve.

[0030] After docking, the pipe needs to be placed in the foundation pit. This embodiment uses the following technical solution to release the pipe 10 from the support 9: The bottom of the hanger 7 is connected to a mounting base 11, which is equipped with a dual-axis motor 12. Rotating shafts 13 are connected to the output shafts on both sides of the dual-axis motor 12. The bottom of the hanger 7 is connected to a lug 14, on which a gear 15 is rotatably connected. The gear 15 is keyed to the rotating shaft 13 and meshes with a rack plate 8. After docking is completed, the dual-axis motor 12 is started, driving the gear 15 to rotate. Through the meshing of the gear and the rack plate 8, the rack plate 8 retracts, meaning the supports 9 symmetrically supporting the pipe 10 move away from each other, releasing the pipe 10, which then falls onto the foundation.

[0031] This invention ensures the straightness of the pipe connection end by setting two sets of symmetrical supports. Furthermore, this embodiment also sets a pressure seat 16 to cooperate with the support 9 to ensure the roundness of the pipe connection end. Specifically: a sliding plate 17 is slidably set at the bottom of the hanger 7, and the end of the sliding plate 17 is connected to the pressure seat 16. Both the pressure seat 16 and the support 9 are arc plates adapted to the pipe 10. An end plate 18 is connected to the end of the sliding plate 17 that is different from the pressure seat. A positioning shaft 19 is connected between the end plate 18 and the hanger 7. A first spring 20 is sleeved on the positioning shaft 19. The two ends of the first spring 20 are in contact with the end plate 18 and the hanger 7, respectively. A guide frame 21 is connected to the frame 4. The guide frame 21 is provided with a guide groove, which includes a connecting oblique groove 211 and a vertical groove 212. A sliding column 22 is connected to the side of the end plate 18. The sliding column 22 is located in the guide groove.

[0032] Before hoisting the pipe 10, the supports 9 are close together and positioned at a high level. Then, the pipe 10 is hoisted and placed on the supports 9, and slowly lowered to the base. At this time, the winch cooperates with the lowering of the lifting frame 7. During the descent of the lifting frame 7, the sliding column 22 moves down with the lifting frame. During the descent, the sliding column 22 first interacts with the inclined groove 211 of the guide frame 21 at a fixed height. Under the action of the inclined groove 211, it gradually pushes the symmetrical pressure seats 16 closer together and finally presses them tightly against the outer wall of the pipe 10. At the same time, the first spring 20 is compressed. Since the pressure seats 16, supports 9 and pipe 10 are adapted, the elastic force of the first spring 20 can maintain the roundness of the pipe.

[0033] Since the foundation pit is generally deep and the pipe diameter has various conventional sizes, before the sliding column 22 enters the vertical groove 212, it is first pressed tightly against the outer wall of the pipe. Then, during the period from contacting the outer wall of the pipe until entering the vertical groove 212, the hanger 7 continues to move downward and the first spring 20 continues to store force. When the sliding column 22 enters the vertical groove 212, the first spring 20 maintains the current compression amount, and the pressure seat 16 and the support seat 9 clamp the pipe 10 and move downward synchronously until they reach the docking height of the base. This scheme maintains a constant clamping force on the pipe 10, which not only ensures the purpose of maintaining the roundness of the pipe, but also avoids damage to the pipe.

[0034] Reference Appendix Figure 6 In this embodiment, continuous pipe docking operations are generally achieved using three sets of support vehicles 1. The pipe that has already been docked at one end is referred to as the "current pipe" below, and the pipe docked with it is referred to as the "rear pipe." Two sets of support vehicles 1 are placed close together across the foundation pit. The one on the current pipe is described as the "current support vehicle," and the one on the rear pipe is described as the "rear support vehicle." One end of the current pipe has been docked, and the end to be docked with the rear pipe is placed on the current support vehicle. Then, another support vehicle, described as the "secondary rear support vehicle," is placed on the foundation pit away from the rear support vehicle, at a distance equal to the length of a section of pipe. The rear pipe is hoisted and placed between the secondary and primary rear support vehicles, meaning both ends of the rear pipe are suspended at a certain height above the foundation. The current pipe and the rear pipe are docked using heat-shrink sleeves. After docking, the current and rear support vehicles release the current and rear pipes. At this point, both ends of the current pipe are docked. The current and rear support vehicles can then be moved backward, and a new pipe can be hoisted. This process is repeated to complete the docking operation.

[0035] In this embodiment, the pipe connections are all made at a certain height above the base, eliminating the need for base excavation and backfilling. Sufficient operating space is available for both heat shrink sleeve installation and flame gun heat treatment, ensuring both efficiency and safety of the connection process.

[0036] Reference Appendix Figures 1-5 When using three sets of support vehicles in a cycle, the current support vehicle and the next support vehicle need to be moved backward. Since the next support vehicle is already lying across the pit and supporting the end of the pipeline to be docked, the current support vehicle and the next support vehicle need to go around the next support vehicle when moving backward. In this embodiment, the current support vehicle and the next support vehicle are temporarily locked together as one unit through the following scheme, so that the current support vehicle and the next support vehicle can cross the pit. Specifically: a docking cylinder 23 is connected to one side of the top of the frame 4, and a docking shaft 24 is connected to the other side. A second guide frame 25 is connected to the docking shaft 24. A positioning rod 26 is slidably connected between the second guide frames 25. A pin 27 is connected to the bottom of the positioning rod 26. Pin holes are provided on the docking cylinder 23 and the docking shaft 24.

[0037] Initially, the pin 27 at the bottom of the positioning rod 26 of any support vehicle 1 is inserted into the pin hole of the docking cylinder 23. When it is necessary to interlock the two sets of support vehicles into one, the positioning rod 26 of one support vehicle 1 is moved upward, causing the pin 27 to disengage from the docking cylinder 23. This pushes the docking shaft 24 of the other support vehicle 1 into the docking cylinder 23. At this time, the pin holes on the docking shaft 24 and the docking cylinder 23 coincide. The positioning rod 26 is then released, and it moves downward. Simultaneously, the pin 27 on the positioning rod engages with the pin holes on the docking cylinder 23 and the docking shaft 24, completing the temporary locking of the two sets of support vehicles 1 into a support vehicle group. At this time, the support vehicle group can be rotated. Each support vehicle group has wheels 3 supporting it on the foundation next to the pit. After the support vehicle group rotates 90°, its center of gravity remains on the foundation, allowing it to be pulled directly across the pit. The support vehicle group is then moved together to the next docking position before unlocking. In this way, the pipeline can be cyclically docked using three sets of support vehicles.

[0038] This embodiment also uses the following technical solution to redundantly reinforce the support vehicle group to ensure the strength of the support vehicle group when crossing the pit: the chassis 2 is provided with a slot, and a plug rod 28 is slidably provided in the slot. A lever 29 that passes through the slot is connected to the plug rod 28; both the chassis 2 and the plug rod 28 are provided with plug holes, and a locking rod 30 is provided at the plug hole.

[0039] When not forming a support unit, the insert rod 28 is embedded in a slot on the chassis 2, and the locking rod 30 extends into the slot, limiting its movement and preventing it from slipping out. When it is necessary to temporarily interlock the support unit, the locking rod 30 of one support unit 1 is removed, and the force applied to the lever 29 pushes the insert rod 28 out of the slot and inserts it into the slot of the other support unit 1 until the insertion holes on the chassis 2 and the insert rod 28 coincide. Then, the locking rod 30 is inserted into the insertion hole, achieving redundant locking of the support unit. At this time, the top and bottom of the support unit are connected as one unit, and the support unit has sufficient strength to cross the pit.

[0040] When the top of the support vehicle assembly is locked by the docking cylinder 23 and the docking shaft 24, the distance between the two support vehicles within the support vehicle assembly is fixed. To facilitate the smooth insertion of the bottom locking rod 30 into the insertion hole, this embodiment is designed so that the insertion rod 28 of support vehicle 1 is pushed out of the slot and inserted into the slot of the other support vehicle 1, stopping when it abuts against the locking rod 30 of the other support vehicle 1. At this time, the insertion hole on the chassis 2 of support vehicle 1 and the insertion rod 28 coincide. That is, after the upper part is locked, it is only necessary to push the bottom insertion rod 28 until it abuts against the locking rod 30 inside the other support vehicle 1 to make the insertion hole on the chassis 2 and the insertion rod 28 coincide, and then inserting the locking rod 30 will complete the locking.

[0041] Based on common sense, when installing heat shrink sleeves, proper positioning is required. The heat shrink sleeve should be centered at the interface, with at least 100mm of overlap with the pipe body on both sides. Since the heat shrink sleeve is a standard part, it is necessary to ensure that the distance between the two pipes is constant before connection. In this embodiment, by setting a positioning component, the lifting accuracy of pipe 10 can be achieved during hoisting: the bottom of the frame 4 is provided with a clearance groove 401, and a screw 32 is rotatably installed in the clearance groove. One end of the screw 32, which passes through the clearance groove, is connected to a nut 33. An adjusting rod 34 is threaded onto the screw 32, and a positioning component 31 is provided on the adjusting rod 34.

[0042] During the hoisting of pipe 10, the current support vehicle and the rear support vehicle are temporarily locked together, and the distance between the two support vehicles is fixed. Only the position of the positioning component 31 needs to be adjusted once, and thereafter no further adjustment is required. To adjust the position, rotate the screw cap 33, causing the screw 32 to rotate, which in turn causes the adjusting rod 34 to slide within the clearance groove 401, thus adjusting the position of the positioning component 31. When hoisting pipe 10 (the rear pipe), simply lower the pipe to the height of the support 9, and then move it horizontally towards the positioning component 31 until the end of the pipe abuts against the positioning component 31. At this point, lowering it into the rear pipe completes the hoisting and positioning process.

[0043] In this embodiment, to ensure the interchangeability of the support vehicles, that is, any two sets of support vehicles can be temporarily locked, the structure, except for the temporary locking structure at the top, is symmetrical. The positioning component is also provided with two sets symmetrical about the hanger 7 in the direction of the pipe axis. When hoisting the pipe, the length of the positioning component 31 needs to extend into the circle formed by the support 9, that is, the circle of the pipe end face, in order to complete the purpose of restricting the positioning of the pipe. At this time, the other symmetrical positioning component 31 is in the path of the pipe hoisting movement. In this embodiment, the positioning operation is performed by the following scheme: the positioning component 31 is slidably set on the adjusting rod 34. One end of the positioning component 31 is connected to the limit cap 35, and the other end is connected to the stop circle 36. The positioning component 31 is provided with a second spring 37, and the two ends of the second spring 37 contact the adjusting rod 34 and the stop circle 36 respectively.

[0044] After the position of the adjusting rod 34 is adjusted, the pipe 10 is hoisted. When the pipe 10 is lowered to the height of the support 9, it first contacts the stop circle 36 away from the docking end. By squeezing the stop circle 36, the positioning part 31 is retracted and the second spring 37 is compressed. Then, the pipe 10 is moved horizontally until it abuts against the stop circle 36 at the docking point, completing the hoisting and positioning. After that, the pipe 10 is lowered to the base. At this time, the hanger 7 is lowered accordingly. However, the stop circle 36 near the docking point remains stationary, while the stop circle 36 away from the docking point will disengage from the pipe and reset.

[0045] The edge of the stop circle 36 is rounded. When the pipe surface has corrugations, the pipe can move between the corrugations on the pipe surface during horizontal hoisting and lateral movement.

[0046] The pipe docking device of this invention allows for cyclic docking of pipes within a foundation pit using three sets of support vehicles 1. Any two sets suspend the two pipes to be docked in a certain space above the foundation. These two sets of support vehicles 1 are locked together by a redundant interlocking mechanism, ensuring structural stability. Based on this, it can assist in the one-time hoisting of the pipes during lifting, meeting the dimensional requirements for heat shrink sleeve installation. Simultaneously, the locked two sets of support vehicles can rotate together and cross the foundation pit, facilitating movement. Each support vehicle is equipped with a pressure seat. During pipe hoisting, as the pipe moves downwards, the pressure seat activates to press firmly against the outer wall of the pipe. Connecting supports clamp the pipe, maintaining its roundness. Simultaneously, two sets of supports in the axial direction maintain the straightness of the pipe. Thus, the pipe docking device of this invention provides sufficient operating space, eliminates the need for foundation excavation, improves docking efficiency, and has a simple overall structure, meeting the complex requirements of on-site construction environments in water conservancy projects.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pipe connection device for water conservancy projects, comprising at least three sets of support vehicles (1), each support vehicle (1) comprising a chassis (2), wheels (3) connected to the bottom of the chassis (2), and a frame (4) connected to the chassis (2), characterized in that: A winch (5) is connected to the chassis (2), a fixed pulley (6) is connected to the top of the frame (4), the winch (5)’s winding rope passes over the fixed pulley (6) and is connected to a hanger (7), a symmetrical rack plate (8) is connected to the bottom of the hanger (7), a support (9) is connected to the rack plate (8); a mounting base (11) is connected to the bottom of the hanger (7), a dual-shaft motor (12) is provided on the mounting base (11), a rotating shaft (13) is connected to the output shafts on both sides of the dual-shaft motor (12), a support lug (14) is connected to the bottom of the hanger (7), a gear (15) is rotatably connected to the support lug (14), the gear (15) is keyed to the rotating shaft (13), and the gear (15) meshes with the rack plate (8); Two sets of supports (9) of equal height are provided along the axial direction of the pipe (10); The bottom of the hanger (7) is slidably provided with a sliding plate (17), and the end of the sliding plate (17) is connected to a pressure seat (16). The pressure seat (16) and the support (9) are both arc plates adapted to the pipe (10). The side of the sliding plate (17) away from the pressure seat (16) is connected to an end plate (18). A positioning shaft (19) is connected between the end plate (18) and the hanger (7). A first spring (20) is sleeved on the positioning shaft (19). The two ends of the first spring (20) are in contact with the end plate (18) and the hanger (7) respectively. A guide frame (21) is connected to the frame (4). A guide groove is provided on the guide frame (21). The guide groove includes a connecting inclined groove (211) and a vertical groove (212). A sliding column (22) is connected to one side of the end plate (18). The sliding column (22) is located in the guide groove. The top of the frame (4) is connected to a docking cylinder (23) on one side and a docking shaft (24) on the other side. A second guide frame (25) is connected to the docking shaft (24). A positioning rod (26) is slidably connected between the second guide frames (25). A pin (27) is connected to the bottom of the positioning rod (26). Pin holes are provided on the docking cylinder (23) and the docking shaft (24). A slot is provided on the chassis (2). A plug rod (28) is slidably provided in the slot. A lever (29) that passes through the slot is connected to the plug rod (28). Insertion holes are provided on both the chassis (2) and the plug rod (28). A locking rod (30) is provided at the insertion hole.

2. The pipe connection device for water conservancy projects according to claim 1, characterized in that: The insertion rod (28) of the support vehicle (1) is pushed out of the slot and inserted into the slot of another support vehicle (1). It stops when it abuts against the locking rod (30) of the other support vehicle (1). At this time, the insertion holes on the chassis (2) and the insertion rod (28) coincide.

3. The pipe connection device for water conservancy projects according to claim 2, characterized in that: It also includes a positioning component. The bottom of the frame (4) is provided with a clearance groove (401). The positioning component includes a screw (32) that is rotatably disposed in the clearance groove. One end of the screw (32) that passes through the clearance groove (401) is connected to a nut (33). An adjusting rod (34) is threaded onto the screw (32). A positioning component (31) is provided on the adjusting rod (34).

4. The pipe connection device for water conservancy projects according to claim 3, characterized in that: The positioning assembly has two sets of symmetrical about the hanger (7) in the direction of the pipe axis. The positioning member (31) is slidably mounted on the adjusting rod (34). One end of the positioning member (31) is connected to a limit cap (35), and the other end is connected to a stop circle (36). The positioning member (31) is provided with a second spring (37), and the two ends of the second spring (37) contact the adjusting rod (34) and the stop circle (36) respectively.

5. The pipe connection device for water conservancy projects according to claim 4, characterized in that: The edge of the stop circle (36) is rounded.

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