Steel pipe butt joint structure

Abstract

The application discloses a steel pipe butt joint structure, which comprises two inner joint flanges, each of the inner joint flanges comprises an inner joint sleeve, a connecting structure, a flange plate, a pressure adjusting mechanism and at least three arc-shaped pressing plates; when the steel pipe butt joint structure is used to butt joint two steel pipes, the inner joint sleeves of the two inner joint flanges are nested in the corresponding steel pipes, and the flange plates of the two inner joint flanges are connected, then the arc-shaped pressing plates can be arched to abut against the inner walls of the steel pipes through the pressure adjusting mechanism, so that the fitting gap between the inner joint flanges and the steel pipes is eliminated, the problem of poor port alignment accuracy caused by the fitting gap is avoided, the position of the steel pipes does not need to be adjusted artificially when welding, the welding operation is facilitated, the weld residual stress caused by welding is avoided, and the weld quality consistency between the steel pipes is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering construction, in particular to a steel pipe butt joint structure. BACKGROUND

[0002] Long steel pipes are often used in long-span structures, such as long-span foundation support, hetero-cable-stayed bridge with horizontal cable, etc. During construction, the steel pipes are transported to the site in sections and then welded and assembled on site to the predetermined position. In this process, the steel pipe butt joint structure is often used to pre-fix two connected steel pipes to prevent the cumulative error of long-span steel pipe assembly from being too large, which causes the steel pipe to deviate from the ideal position.

[0003] The existing steel pipe butt joint structure is composed of two inner flanges, and the two inner flanges are the same structure, including a flange plate, an inner sleeve and a connecting rib connected between the flange plate and the inner sleeve. During installation, the flange plates of the two inner flanges are fixed by bolt connection, the inner sleeves of the two inner flanges are nested in the two steel pipes respectively, and then the two steel pipes are butt jointed and welded.

[0004] However, in order to facilitate assembly, there is a certain gap between the inner sleeve and the inner wall of the steel pipe after assembly, and the relative position accuracy of the two steel pipes is poor. During welding, additional human intervention may be required, such as stopping one of the steel pipes to further approach the ideal state of the relative position of the two steel pipes, which makes the construction operation difficult and the weld quality between the steel pipes poor. SUMMARY

[0005] The main purpose of the present application is to provide a steel pipe butt joint structure to improve the butt joint accuracy of the steel pipe.

[0006] To achieve the above purpose, the present application provides a steel pipe butt joint structure, which includes two inner flanges, each of which includes:

[0007] An inner sleeve for nesting with a steel pipe, the wall surface of the inner sleeve is provided with at least three avoiding openings, and a plurality of avoiding openings are arranged along the circumference of the inner sleeve;

[0008] A connecting structure connected to one end of the inner sleeve;

[0009] A flange plate connected to the other end of the connecting structure away from the inner sleeve;

[0010] A pressure adjusting mechanism installed on the inner wall of the inner sleeve, the pressure adjusting mechanism is formed with a plurality of output ends for outputting power;

[0011] At least three arc-shaped pressing plates, which have a width direction and a length direction, have two ends of the length direction connected with the corresponding output ends respectively, and the outer arc surface of the arc-shaped pressing plate protrudes from the outer surface of the inner sleeve through the avoiding opening, and the arc-shaped pressing plate can be arched to abut against the inner wall of the steel pipe under the driving of the output end.

[0012] The flange plates of the two inner flanges are connected through bolts, and the projection of the connecting structure and the flange plate in the axial direction of the inner sleeve is located in the inner sleeve.

[0013] In some embodiments of the present application, the pressure adjusting mechanism comprises a plurality of pressure cylinder assemblies, and each pressure cylinder assembly has two output ends formed on opposite sides, and the output ends are rotationally connected with one end of two adjacent arc-shaped pressing plates.

[0014] In some embodiments of the present application, the pressure cylinder assembly comprises two electrically controlled hydraulic cylinders, the inner wall of the inner sleeve is provided with a plurality of mounting seats, each mounting seat is located between two adjacent avoiding openings, the cylinder body of the two electrically controlled hydraulic cylinders is mounted on the top surface of the mounting seat, the piston rod of the two electrically controlled hydraulic cylinders extends in the direction away from each other, and the output end is the end of the piston rod away from the cylinder body.

[0015] In some embodiments of the present application, the arc-shaped pressing plate comprises an arc-shaped plate part and two hinge parts, and the two hinge parts are connected to the two ends of the length direction of the arc-shaped plate part and located on the inner arc surface side of the arc-shaped plate part.

[0016] In some embodiments of the present application, the pressure cylinder assembly further comprises a power supply module, the top surface of the mounting seat is further provided with a mounting groove, the power supply module is mounted in the mounting groove and electrically connected with the two electrically controlled hydraulic cylinders.

[0017] In some embodiments of the present application, the pressure adjusting mechanism further comprises a control module and a plurality of load detection modules, the plurality of load detection modules are connected with the plurality of electrically controlled hydraulic cylinders one by one and can detect the load of the corresponding electrically controlled hydraulic cylinder.

[0018] The control module is electrically connected with each load detection module to receive the detection signal of the load detection module, and the control module is also electrically connected with the plurality of power supply modules to control the working of the power supply module.

[0019] In some embodiments of the present application, the projection of the piston in the sliding direction is located in the corresponding avoiding opening.

[0020] In some embodiments of the present application, the included angle between the sliding axes of the two pistons connected by the arc-shaped pressing plate is not less than 75 degrees and not more than 105 degrees.

[0021] In some embodiments of the present application, four arc-shaped pressing plates are provided, and the pressure cylinder assembly is correspondingly provided with four arc-shaped pressing plates, and the arc-shaped pressing plates and the pressure cylinder assembly are alternately arranged along the circumference of the inner sleeve.

[0022] In some embodiments of the present application, the connecting structure comprises a disc body and a plurality of connecting rib plates, the periphery of the disc body is connected to the port periphery of the inner sleeve, one end of the plurality of connecting rib plates is connected to the side of the disc body away from the inner sleeve, and the other end is connected to the flange plate.

[0023] In the steel pipe butt joint structure of the present application, when two steel pipes are butt jointed, the inner sleeves of the two inner flanges are nested in the corresponding steel pipes, and the flange plates of the two are connected, then the arc-shaped pressing plates can be arched by the pressure adjusting mechanism to abut against the inner wall of the steel pipe, so as to eliminate the fitting gap between the inner flange and the steel pipe, so that the port alignment accuracy of the two is not poor due to the existence of the fitting gap, and the position of the steel pipe does not need to be adjusted artificially during welding, which is convenient for welding operation, and can avoid the generation of weld seam secondary force during welding, and ensure the consistency of the weld seam quality between the steel pipes. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The structural schematic diagram of an embodiment of the steel pipe butt joint structure provided by the present application is shown in the figure.

[0026] Figure 2 The structural schematic diagram of an embodiment of the inner flange in the steel pipe butt joint structure provided by the present application is shown in the figure.

[0027] Figure 3 The structural schematic diagram of another view of the inner flange in the steel pipe butt joint structure provided by the present application is shown in the figure.

[0028] Figure 4 The structural schematic diagram of another view of the inner flange in the steel pipe butt joint structure provided by the present application is shown in the figure. Figure 3 The enlarged view of A in the figure.

[0029] Figure 5 The structural schematic diagram of an embodiment of the arc-shaped pressing plate in the steel pipe butt joint structure provided by the present application is shown in the figure.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 100, steel pipe butt joint structure; 10, inner joint flange; 11, inner joint sleeve; 111, avoiding opening; 112, mounting seat; 113, mounting groove; 12, connecting structure; 121, disc body; 122, connecting rib plate; 13, flange plate; 14, pressure adjusting mechanism; 140, pressure cylinder assembly; 141, electric control hydraulic cylinder; 142, cylinder body; 143, piston; 144, power supply module; 17, arc-shaped pressing plate; 171, arc-shaped plate part; 172, hinged part; 200, steel pipe.

[0032] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0034] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0035] In addition, if the embodiments of the present application involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel solutions are included, for example, "A and / or B" includes A solution, or B solution, or A and B solutions are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection claimed by the present application.

[0036] Please refer to Figures 1 to 5The application provides a steel pipe 200 butt joint structure 100, which is applied to butt joint of the super-large pipe diameter steel pipe 200 in engineering, and comprises two inner joint flanges 10, each of the inner joint flanges 10 comprises an inner joint sleeve 11, a connecting structure 12, a flange plate 13, a pressure adjusting mechanism 14 and at least three arc-shaped pressing plates 17, wherein the inner joint sleeve 11 is used for being nested with the steel pipe 200, at least three avoiding openings 111 are formed in the wall surface of the inner joint sleeve 11, and the avoiding openings 111 are arranged in a circumferential direction of the inner joint sleeve 11; one end of the connecting structure 12 is connected with the inner joint sleeve 11; the flange plate 13 is connected to the end of the connecting structure 12, which is away from the inner joint sleeve 11; the pressure adjusting mechanism 14 is installed on the inner wall of the inner joint sleeve 11, and the pressure adjusting mechanism 14 is formed with a plurality of output ends for outputting power; the arc-shaped pressing plate 17 has a width direction and a length direction, two ends of the arc-shaped pressing plate 17 in the length direction are connected with corresponding output ends respectively, and the outer arc surface of the arc-shaped pressing plate 17 is protruded from the outer surface of the inner joint sleeve 11 through the avoiding openings 111; and the arc-shaped pressing plate 17 can be arched to abut against the inner wall of the steel pipe 200 under the drive of the output ends.

[0037] When the two steel pipes 200 are butt jointed by using the steel pipe 200 butt joint structure 100 in the application, the inner joint sleeves 11 of the two inner joint flanges 10 are nested in the corresponding steel pipes 200, the flange plates 13 of the two inner joint flanges 10 are connected, then the arc-shaped pressing plates 17 can be arched to abut against the inner wall of the steel pipe 200 through the pressure adjusting mechanism 14, so that the fitting gap between the inner joint flange 10 and the steel pipe 200 is eliminated, the problem that the port alignment accuracy is poor due to the existence of the fitting gap does not occur, and the position of the steel pipe 200 does not need to be adjusted artificially during welding, so that the welding operation is facilitated, and the weld force generated by welding is avoided, and the weld quality consistency between the steel pipes 200 is ensured.

[0038] After the steel pipe 200 is welded, the arc-shaped pressing plates 17 can be loosened again in the steel pipe 200 through the pressure adjusting mechanism 14, and then the steel pipe 200 butt joint structure is pulled out from the steel pipe 200.

[0039] The arc-shaped pressing plate 17 is generally made of steel, and can be carbon spring steel, low manganese spring steel and the like, has high strength and durability, can bear heavy load and long-term use, can maintain the function and shape under the long-time bending condition, and the arc-shaped plate part 171 is designed so that the pressing plate can better adapt to the shape of the inner wall of the steel pipe 200 and provide uniform pressure distribution.

[0040] The specific implementation of the pressure adjusting mechanism 14 is various, and the pressure adjusting mechanism 14 can be in the form of electric drive or manual drive to drive the arc-shaped pressing plates 17 to deform. Specifically, in some embodiments of the present application, the pressure adjusting mechanism 14 comprises a threaded sleeve and two screw rods, one end of each of the two screw rods is matched with one end of the threaded sleeve, and the other end of each of the two screw rods is an output end and is connected with the end of each of the two arc-shaped pressing plates 17. When the threaded sleeve rotates relative to the two screw rods, the two screw rods move away from or close to each other in the axial direction. Thus, when the inner flange 10 is installed into the steel pipe 200, since the screw rods cannot rotate due to the limitation of the arc-shaped pressing plates 17, the two screw rods can be quickly moved away from each other by manually rotating the threaded sleeve, so that the arc-shaped pressing plates 17 abut against the inner wall of the steel pipe 200, and then the threaded sleeve can be continuously rotated by means of a wrench tool to adjust the pressure of the arc-shaped pressing plates 17 abutting against the steel pipe 200, so as to realize the adjustment of the fitting tightness.

[0041] In some other embodiments of the present application, the pressure adjusting mechanism 14 comprises a plurality of pressure cylinder assemblies 140, and each of the pressure cylinder assemblies 140 is formed with two output ends on opposite sides, and the output ends are rotationally connected with the ends of two adjacent arc-shaped pressing plates 17.

[0042] In some embodiments of the present application, the pressure cylinder assembly 140 comprises two electrically controlled hydraulic cylinders 141, the inner wall of the inner sleeve 11 is provided with a plurality of mounting seats 112, each of the mounting seats 112 is located between two adjacent relief openings 111, the cylinder bodies 142 of the two electrically controlled hydraulic cylinders 141 are mounted on the top surfaces of the mounting seats 112, the piston rods 143 of the two electrically controlled hydraulic cylinders 141 extend in the direction away from each other, and the output ends are the end portions of the piston rods 143 away from the cylinder bodies 142.

[0043] Through the pressure cylinder assembly 140, the pressure acting on the arc-shaped pressing plates 17 can be accurately controlled, so as to ensure that the pressure is uniform and stable when the steel pipes 200 are butt-jointed. The two-end output design of the pressure cylinder assembly 140 balances the reaction force of the arc-shaped pressing plates 17, enhances the stability of the entire butt-joint structure, reduces the risk of structural deformation or damage caused by uneven pressure, and the pressure cylinder assembly 140 can quickly respond to pressure changes, and the arc-shaped pressing plates 17 can be quickly adjusted to adapt to different butt-joint requirements, which greatly shortens the butt-joint preparation time and improves the work efficiency. The design of the mounting seat 112 avoids the problem of inconvenient assembly of the arc-shaped inner wall of the concave steel pipe 200. The top surface of the mounting seat 112 can be directly designed as a plane, or can be designed according to the required installation angle of the electrically controlled hydraulic cylinder 141, which is not limited herein.

[0044] The arc-shaped pressing plate 17 can be connected to the output end in various ways. In some embodiments of the present application, the two ends of the arc-shaped pressing plate 17 are respectively provided with a hinge shaft on the opposite sides in the width direction, and the output end of the pressure cylinder assembly 140 is provided with two lugs, the two lugs are provided with rotating holes, and the hinge shaft is assembled in the rotating holes.

[0045] The arc-shaped pressing plate 17 can have various specific structures. In some embodiments of the present application, the arc-shaped pressing plate 17 comprises an arc-shaped plate portion 171 and two hinge portions 172, the two hinge portions 172 are connected to the two ends of the arc-shaped plate portion 171 in the length direction and are located on the inner arc side of the arc-shaped plate portion 171. In this way, when the arc-shaped pressing plate 17 is installed, the inconvenience of the hinge portion 172 being limited in the narrow space between the outer arc surface of the arc-shaped plate body and the inner wall of the inner sleeve 11 is avoided.

[0046] Specifically, in some embodiments of the present application, the hinge portion 172 is a hinge sleeve, the outer wall of the hinge sleeve is integrally connected with the inner arc surface of the arc-shaped plate portion 171, the output end of the pressure cylinder assembly 140 is provided with two lugs, the two lugs are provided with rotating holes, the hinge sleeve is arranged between the two lugs and is aligned with the two rotating holes, and the two lugs and the hinge sleeve are hingedly connected through a rotating shaft.

[0047] The pressure cylinder assembly 140 can be connected to an external power source. Considering that it is not easy to pull the power source in the steel pipe 200, in some embodiments of the present application, the pressure cylinder assembly 140 further comprises a power supply module 144, the top surface of the mounting seat 112 is further provided with a mounting groove 113, and the power supply module 144 is mounted in the mounting groove 113 and is electrically connected with the corresponding two electrically controlled hydraulic cylinders 141. In this way, the butt joint process of the steel pipe 200 can be further simplified, the power supply module 144 is directly integrated on the mounting seat 112, the entire system is more compact, external wiring is reduced, installation and maintenance are facilitated, and the system can cope with the dirty and messy environment of the construction site.

[0048] Further, in some embodiments of the present application, the pressure regulating mechanism 14 further comprises a control module and a plurality of load detection modules, the plurality of load detection modules are respectively connected with the plurality of electrically controlled hydraulic cylinders 141 one by one and can detect the load of the corresponding electrically controlled hydraulic cylinder 141, the control module is electrically connected with each load detection module to receive the detection signal of the load detection module, and the control module is further electrically connected with the plurality of power supply modules 144 to control the working of the power supply modules 144. In this way, the detection signal of the load detection module can be received by the control module, the working condition of each electrically controlled hydraulic cylinder 141 can be accurately controlled, and the accuracy and consistency of pressure regulation can be ensured. In addition, real-time monitoring and control can prevent equipment damage caused by overload or abnormal pressure, and the safety of the system is enhanced.

[0049] In some embodiments of the present application, the projection of the piston 143 in the sliding direction thereof is located within the corresponding avoiding opening 111. In this way, the piston 143 can be prevented from being restricted by the inner sleeve 11 during the movement of the arc-shaped pressing plate 17, so as to prevent a large interaction force from being generated between the arc-shaped pressing plate 17 and the inner sleeve 11, thereby increasing the load of the pressure cylinder assembly 140 and causing energy waste.

[0050] In some embodiments of the present application, the included angle between the sliding axes of the two pistons 143 connected to the arc-shaped pressing plate 17 is not less than 75 degrees and not more than 105 degrees. Specifically, the included angle can be 75 degrees, 85 degrees, 90 degrees, 95 degrees, 100 degrees, 105 degrees, etc. In this way, the arc-shaped pressing plate 17 can be bent and deformed to form an arch during the movement of the arc-shaped pressing plate 17 driven by the pressure cylinder assembly 140, and the arc-shaped pressing plate 17 can be moved as a whole under the driving of the piston 143, so that the outer arc surface of the arc-shaped pressing plate 17 can quickly abut against the inner wall of the steel pipe 200, thereby increasing the construction efficiency. In addition, the included angle between the sliding axes of the two pistons 143 connected to the arc-shaped pressing plate 17 is an acute angle or an obtuse angle, each of which has its own advantages. When the included angle between the sliding axes of the two pistons 143 connected to the arc-shaped pressing plate 17 is an obtuse angle, the arc-shaped pressing plate 17 has a tendency to open in the state of abutting against the inner wall of the steel pipe 200, and the piston 143 is subjected to a smaller bending moment of the arc-shaped pressing plate 17, thereby having a smaller influence on the working stability of the pressure cylinder. When the included angle between the sliding axes of the two pistons 143 connected to the arc-shaped pressing plate 17 is an acute angle, the deformation amount of the arc-shaped pressing plate 17 is smaller during the process of the arc-shaped pressing plate 17 being convex from the initial position to the inner wall of the steel pipe 200 driven by the piston 143, thereby avoiding a large interaction force being generated between the arc-shaped pressing plate 17 and the piston 143 before the arc-shaped pressing plate 17 contacts the inner wall of the steel pipe 200.

[0051] In some embodiments of the present application, four arc-shaped pressing plates 17 are provided, and four pressure cylinder assemblies 140 are correspondingly provided, and the arc-shaped pressing plates 17 and the pressure cylinder assemblies 140 are alternately arranged along the circumference of the inner sleeve 11. By alternately arranging the four arc-shaped pressing plates 17 and the pressure cylinder assemblies 140 along the circumference, it can be ensured that the pressure on the inner wall of the steel pipe 200 is more uniformly distributed, thereby reducing local stress concentration and improving the stability and reliability of the butt joint structure. The number of four arc-shaped pressing plates 17 is appropriate, on the one hand, it can cover more area of the inner wall of the steel pipe 200, thereby increasing the contact area and improving the sealing and stability of the butt joint of the steel pipe 200, and on the other hand, the structure is relatively simple and easy to maintain.

[0052] In some embodiments of the present application, the connecting structure 12 comprises a disc body 121 and a plurality of connecting ribs 122, the periphery of the disc body 121 is connected to the port periphery of the inner sleeve 11, one end of the plurality of connecting ribs 122 is connected to the side of the disc body 121 away from the inner sleeve 11, and the other end is connected to the flange plate 13. The design of the disc body 121 and the connecting ribs 122 can significantly improve the overall strength and rigidity of the connecting structure 12, so that it can withstand larger loads and pressures. The connecting ribs 122 help to disperse and transfer loads, reduce stress concentration between the inner sleeve 11 and the flange plate 13, and improve the stability of the entire structure. The plurality of connecting ribs 122 are generally arranged equidistantly along the circumference of the disc body 121, which can ensure that the disc body 121 and the flange plate 13 are uniformly stressed. In addition, the spacing between the connecting ribs 122 can avoid the openings of the flange plate 13, facilitating the bolt connection of the two flange plates 13.

[0053] In some embodiments of the present application, a first through hole is provided in the center of the disc body 121, a second through hole is provided in the center of the flange plate 13, and a clearance passage is provided between the first through hole and the second through hole in the middle of the plurality of connecting structures 12. The first through hole and the second through hole not only can eliminate stress, but also can be used for wiring or other purposes in combination with the clearance passage during construction.

[0054] The above description is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A steel pipe butt joint structure (100) characterized by, Two inner flanges (10) are included, each of which comprises: An inner sleeve (11) is used to nest with a steel pipe, and the wall surface of the inner sleeve (11) is provided with at least three avoiding openings (111), and a plurality of avoiding openings (111) are arranged in a circumferential direction of the inner sleeve (11); A connecting structure (12) is connected to one end of the inner sleeve (11); A flange plate (13) is connected to the other end of the connecting structure (12) away from the inner sleeve (11); A pressure adjusting mechanism (14) is installed on the inner wall of the inner sleeve (11), and the pressure adjusting mechanism (14) is formed with a plurality of output ends for outputting power; At least three arc-shaped pressing plates (17) have a width direction and a length direction, and the two ends of the arc-shaped pressing plate (17) in the length direction are connected with the corresponding output ends, respectively, the outer arc surface of the arc-shaped pressing plate (17) is protruded from the outer surface of the inner sleeve (11) by the avoiding opening (111), and the arc-shaped pressing plate (17) can be arched to abut against the inner wall of the steel pipe under the driving of the output end; The flange plates (13) of the two inner flanges (10) are connected by bolts, and the projections of the connecting structure (12) and the flange plate (13) in the axial direction of the inner sleeve (11) are located in the inner sleeve (11).

2. The steel pipe butt joint structure (100) according to claim 1, characterized by The pressure adjusting mechanism (14) comprises a plurality of pressure cylinder assemblies (140), and each of the pressure cylinder assemblies (140) is formed with two output ends on opposite sides, and the output ends are rotatably connected with two adjacent arc-shaped pressing plates (17) close to one end, respectively.

3. The steel pipe butt joint structure (100) according to claim 2, characterized by The pressure cylinder assembly (140) comprises two electrically controlled hydraulic cylinders (141), the inner wall of the inner sleeve (11) is provided with a plurality of mounting seats (112), each of the mounting seats (112) is located between two adjacent avoiding openings (111), the cylinder body (142) of the two electrically controlled hydraulic cylinders (141) is mounted on the top surface of the mounting seat (112), the piston rod (143) of the two electrically controlled hydraulic cylinders (141) extends in a direction away from each other, and the output end is the end of the piston rod (143) away from the cylinder body (142).

4. The steel pipe butt joint structure (100) according to claim 2, characterized by The arc-shaped pressing plate (17) comprises an arc-shaped plate portion (171) and two hinge portions (172), and the two hinge portions (172) are connected to the two ends of the arc-shaped plate portion (171) in the length direction and are located on the inner arc surface side of the arc-shaped plate portion (171).

5. The steel pipe butt joint structure (100) according to claim 3, characterized by The pressure cylinder assembly (140) further comprises a power supply module (144), and the top surface of the mounting seat (112) is further provided with a mounting groove (113), the power supply module (144) is installed in the mounting groove (113) and is electrically connected with the corresponding two electrically controlled hydraulic cylinders (141).

6. The steel pipe butt joint structure (100) according to claim 5, characterized by The pressure regulating mechanism (14) further comprises a control module and a plurality of load detection modules, each of the load detection modules is connected with one of the electrically-controlled hydraulic cylinders (141) and can detect the load of the corresponding electrically-controlled hydraulic cylinder (141); The control module is electrically connected with each of the load detection modules to receive the detection signals of the load detection modules, and is further electrically connected with the plurality of power supply modules (144) to control the operation of the power supply modules (144).

7. The steel pipe butt joint structure (100) according to claim 3, characterized by The projection of the piston (143) in the sliding direction of the piston (143) is located in the corresponding avoiding opening (111).

8. The steel pipe butt joint structure (100) according to claim 3, characterized by The included angle between the sliding axes of two pistons (143) connected with one of the arc-shaped pressing plates (17) is not less than 75 degrees and not more than 105 degrees.

9. The steel pipe butt joint structure (100) according to any one of claims 2 to 8, characterized by Four arc-shaped pressing plates (17) are provided, and four pressure cylinder assemblies (140) are correspondingly provided, and the arc-shaped pressing plates (17) and the pressure cylinder assemblies (140) are alternately arranged along the circumference of the inner sleeve (11).

10. The steel pipe butt joint structure (100) according to any one of claims 1 to 8, characterized by The connecting structure (12) comprises a disc body (121) and a plurality of connecting rib plates (122), the periphery of the disc body (121) is connected with the periphery of the port of the inner sleeve (11), one end of each of the connecting rib plates (122) is connected with one side of the disc body (121) away from the inner sleeve (11), and the other end is connected with the flange plate (13).

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