Steel pipe butt joint structure

Abstract

The invention discloses a steel pipe butt joint structure which comprises two internally-connected flanges, and each internally-connected flange comprises an internally-connected 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 for butt joint of two steel pipes, the inner connection sleeves of the two inner connection flanges are embedded in the corresponding steel pipes, the flange plates of the two inner connection flanges are connected, then the arc-shaped pressing plates are arched to abut against the inner walls of the steel pipes through the pressure adjusting mechanism, and therefore fit clearances between the inner connection flanges and the steel pipes are eliminated, and the butt joint effect is good. In this way, the problem that the port alignment precision is poor due to the fact that a fit clearance exists between the steel pipes is solved, during welding, the positions of the steel pipes do not need to be manually adjusted, welding operation is convenient, meanwhile, it can be guaranteed that weld secondary internal force is avoided during welding, and the weld quality consistency between the steel pipes is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of engineering construction, and in particular to a steel pipe butt joint structure. Background Art

[0002] Long-span structures often require long steel pipe supports, such as long-span foundation pit supports, heterogeneous cable-stayed bridges with horizontal cables, etc. During construction, steel pipes are usually transported to the site in sections, and then welded and assembled on site to the predetermined position. In this process, a steel pipe butt joint structure is often used to pre-fix the two connected steel pipes. The use of a steel pipe butt joint structure can prevent the cumulative error of large-span steel pipe assembly from being too large, causing the steel pipe to deviate from the ideal position.

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

[0004] However, for the convenience of assembly, there will be 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, for example, to push one of the steel pipes to make the relative position of the two steel pipes closer to the ideal state, which makes the construction operation difficult and the quality of the weld between the steel pipes is poor. Summary of the invention

[0005] The main purpose of the invention is to provide a steel pipe butt joint structure, aiming to improve the butt joint accuracy of the steel pipes.

[0006] To achieve the above object, the present invention provides a steel pipe butt joint structure, comprising two internal flanges, each of the internal flanges comprising:

[0007] An inner sleeve, the inner sleeve is used to be nested with the steel pipe, the wall surface of the inner sleeve is provided with at least three avoidance openings, and the plurality of avoidance openings are arranged at intervals along the circumference of the inner sleeve;

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

[0009] A flange connected to an end of the connection structure away from the inner sleeve;

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

[0011] At least three arc-shaped pressing plates, each of which has a width direction and a length direction, and both ends of the arc-shaped pressing plate in the length direction are respectively connected to the corresponding output ends, and the outer arc surface of the arc-shaped pressing plate protrudes from the outer surface of the inner sleeve through the avoidance opening, and the arc-shaped pressing plate can be arched up to abut against the inner wall of the steel pipe under the drive of the output end;

[0012] The flanges of the two inner flanges are connected by bolts, and the projections of the connection structure and the flanges in the axial direction of the inner sleeve are located inside the inner sleeve.

[0013] In some embodiments of the present invention, the pressure regulating mechanism includes a plurality of pressure cylinder assemblies, and two output ends are formed on opposite sides of each of the pressure cylinder assemblies, and the output ends are rotatably connected to one end of two adjacent arc-shaped pressure plates.

[0014] In some embodiments of the present invention, the pressure cylinder assembly includes two electrically controlled hydraulic cylinders, the inner wall of the inner sleeve is protruding with a plurality of mounting seats, each of the mounting seats is located between two adjacent avoidance openings, the cylinder bodies of the two electrically controlled hydraulic cylinders are installed on the top surfaces of the mounting seats, the piston rods of the two electrically controlled hydraulic cylinders extend in directions 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 invention, the arc-shaped pressure plate includes an arc-shaped plate portion and two hinged portions, wherein the two hinged portions are connected to two ends of the arc-shaped plate portion in a length direction and are located on one side of an inner arc surface of the arc-shaped plate portion.

[0016] In some embodiments of the present invention, the pressure cylinder assembly further includes a power supply module, and a mounting groove is further provided on the top surface of the mounting seat. The power supply module is installed in the mounting groove and is electrically connected to the corresponding two electric-controlled hydraulic cylinders.

[0017] In some embodiments of the present invention, the pressure regulating mechanism further includes a control module and a plurality of load detection modules, wherein the plurality of load detection modules are respectively connected to the plurality of the electric-controlled hydraulic cylinders one by one and are capable of detecting the loads of the corresponding electric-controlled hydraulic cylinders;

[0018] The control module is electrically connected to each of the load detection modules to receive detection signals from the load detection modules. The control module is also electrically connected to a plurality of the power supply modules to control the operation of the power supply modules.

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

[0020] In some embodiments of the present invention, the angle between the sliding axes of the two pistons connected to one arc-shaped pressure plate is not less than 75 degrees and not more than 105 degrees.

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

[0022] In some embodiments of the present invention, the connection structure includes a disk body and a plurality of connecting ribs, the periphery of the disk body is connected to the periphery of the port of the inner sleeve, one end of the plurality of connecting ribs is connected to a side of the disk body away from the inner sleeve, and the other end is connected to the flange.

[0023] When the steel pipe butt joint structure of the present invention is used to butt two steel pipes, the inner sleeves of the two inner flanges are nested in the corresponding steel pipes, and the flanges of the two are connected. Then, the pressure regulating mechanism can be used to make the arc pressure plate arch up to press against the inner wall of the steel pipe, thereby eliminating the fitting gap between the inner flange and the steel pipe. In this way, the two will not have the problem of poor port alignment accuracy due to the existence of the fitting gap. When welding, there is no need to manually adjust the position of the steel pipe, which facilitates the welding operation. At the same time, it can ensure that the secondary internal force of the weld is avoided, and the consistency of the weld quality between the steel pipes is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 A structural schematic diagram of an embodiment of a steel pipe butt joint structure provided by the present invention;

[0026] Figure 2 A schematic structural diagram of an embodiment of an internal flange in a steel pipe butt joint structure provided by the present invention;

[0027] Figure 3 A structural schematic diagram of an internal flange in a steel pipe butt joint structure provided by the present invention from another perspective;

[0028] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0029] Figure 5 This is a structural schematic diagram of an embodiment of an arc-shaped pressure plate in a steel pipe butt joint structure provided by the present invention.

[0030] Description of Figure Numbers:

[0031] 100. Steel pipe docking structure; 10. Internal flange; 11. Internal sleeve; 111. Avoidance; 112. Mounting seat; 113. Mounting groove; 12. Connection structure; 121. Disk body; 122. Connecting ribs; 13. Flange; 14. Pressure regulating mechanism; 140. Pressure cylinder assembly; 141. Electric-controlled hydraulic cylinder; 142. Cylinder body; 143. Piston; 144. Power supply module; 17. Arc pressure plate; 171. Arc plate portion; 172. Articulated portion; 200. Steel pipe.

[0032] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] 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.

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

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] See also Figures 1 to 5The present invention proposes a steel pipe 200 docking structure 100, which is used for docking of super-large diameter steel pipes 200 in engineering. The steel pipe 200 docking structure 100 includes two internal flanges 10, each of which includes an internal sleeve 11, a connecting structure 12, a flange 13, a pressure regulating mechanism 14 and at least three arc-shaped pressure plates 17; wherein the internal sleeve 11 is used to be nested with the steel pipe 200, and the wall surface of the internal sleeve 11 is provided with at least three avoidance openings 111, and the plurality of avoidance openings 111 are arranged at intervals along the circumference of the internal sleeve 11; one end of the connecting structure 12 is connected to the internal sleeve 11; the flange 13 is connected to the connecting structure 12 away from the internal sleeve 1 1; a pressure regulating mechanism 14 is installed on the inner wall of the inner sleeve 11, and the pressure regulating mechanism 14 is formed with a plurality of output ends for outputting power; the arc pressure plate 17 has a width direction and a length direction, and the two ends of the arc pressure plate 17 in the length direction are respectively connected to the corresponding output ends, and the outer arc surface of the arc pressure plate 17 protrudes from the outer surface of the inner sleeve 11 by the avoidance opening 111, and the arc pressure plate 17 can be arched under the drive of the output end to resist the inner wall of the steel pipe 200; the flanges 13 of the two inner flanges 10 are connected by bolts, and the projections of the connecting structure 12 and the flange 13 in the axial direction of the inner sleeve 11 are located inside the inner sleeve 11.

[0037] When the steel pipe 200 docking structure 100 of the present invention is used to dock two steel pipes 200, the inner sleeves 11 of the two inner flanges 10 are nested in the corresponding steel pipes 200, and the flanges 13 of the two are connected. Then, the pressure regulating mechanism 14 can be used to make the arc pressure plate 17 arch up to press against the inner wall of the steel pipe 200, thereby eliminating the fitting gap between the inner flange 10 and the steel pipe 200. In this way, the two will not have the problem of poor port alignment accuracy due to the existence of the fitting gap. When welding, there is no need to manually adjust the position of the steel pipe 200, which facilitates the welding operation. At the same time, it can ensure that the secondary internal force of the weld is avoided and the consistency of the weld quality between the steel pipes 200 is ensured.

[0038] After the welding of the steel pipe 200 is completed, the construction personnel can loosen the arc-shaped pressing plate 17 again in the steel pipe 200 through the pressure regulating mechanism 14, and then drag the docking mechanism of the steel pipe 200 out of the steel pipe 200.

[0039] The above-mentioned arc-shaped pressure plate 17 is generally made of steel, specifically carbon spring steel, low manganese spring steel, etc. It has high strength and durability, can withstand heavy loads and long-term use, and can maintain its function and shape under such long-term bending conditions. The design of the arc-shaped plate portion 171 enables the pressure plate to better adapt to the inner wall shape of the steel pipe 200 and provide uniform pressure distribution.

[0040] The specific implementation methods of the above-mentioned pressure regulating mechanism 14 are diverse. The pressure regulating mechanism 14 can be electrically driven or manually driven to drive the arc pressure plate 17 to deform. Specifically, in some embodiments of the present invention, the pressure regulating mechanism 14 includes an internally threaded sleeve and two screws, wherein one end of the two screws are respectively matched with the two ends of the internally threaded sleeve, and the other ends of the two screws are output ends, which are respectively connected to the ends of the two arc pressure plates 17. When the internally threaded sleeve rotates relative to the two screws, the two screws move away from or closer to each other in the axial direction. In this way, when the internal flange 10 is installed into the steel pipe 200, the screw cannot rotate due to the restriction of the arc pressure plate 17. The internally threaded sleeve can be manually screwed to make the two screws move away quickly, so that the arc pressure plate 17 is against the inner wall of the steel pipe 200, and the two screws are supported between the two arc pressure plates 17. Then, the internally threaded sleeve can be continued to be rotated with the help of a wrench tool to adjust the pressure of the arc pressure plate 17 against the steel pipe 200, so as to adjust the tightness of the fit.

[0041] In other embodiments of the present invention, the pressure regulating mechanism 14 includes a plurality of pressure cylinder assemblies 140 , and each of the pressure cylinder assemblies 140 has two output ends formed on opposite sides, and the output ends are rotatably connected to one end of two adjacent arc-shaped pressure plates 17 .

[0042] In some embodiments of the present invention, the pressure cylinder assembly 140 includes two electrically controlled hydraulic cylinders 141, and the inner wall of the inner sleeve 11 is protrudingly provided with a plurality of mounting seats 112, each of the mounting seats 112 is located between two adjacent avoidance openings 111, and the cylinder bodies 142 of the two electrically controlled hydraulic cylinders 141 are installed on the top surfaces of the mounting seats 112, and the piston rods 143 of the two electrically controlled hydraulic cylinders 141 extend in directions away from each other, and the output end is the end of the piston rod 143 away from the cylinder body 142.

[0043] Through the pressure cylinder assembly 140, the pressure acting on the arc pressure plate 17 can be accurately controlled, thereby ensuring that the pressure of the steel pipe 200 is uniform and stable when docking. The output design at both ends of the pressure cylinder assembly 140 balances the reaction force of the arc pressure plate 17 it receives, thereby enhancing the stability of the entire docking structure and reducing the risk of structural deformation or damage caused by uneven pressure. The pressure cylinder assembly 140 can quickly respond to pressure changes, and the arc pressure plate 17 can be quickly adjusted to meet different docking requirements, which greatly shortens the docking preparation time and improves work efficiency. The design of the mounting seat 112 avoids the problem that the concave arc inner wall of the steel pipe 200 is inconvenient to assemble. The top surface of the mounting seat 112 can be directly set as a plane, or it can be designed according to the installation angle required by the electric hydraulic cylinder 141, which is not limited here.

[0044] There are many ways to rotatably connect the arc pressure plate 17 to the output end. In some embodiments of the present invention, the two ends of the arc pressure plate 17 are respectively provided with hinge shafts on opposite sides in the width direction, and the output end of the pressure cylinder assembly 140 is provided with two lugs, and the two lugs are provided with rotating holes, and the hinge shaft is assembled in the rotating holes.

[0045] There are many more specific structures of the arc-shaped pressing plate 17. In some embodiments of the present invention, the arc-shaped pressing plate 17 includes an arc-shaped plate portion 171 and two hinged portions 172. The two hinged portions 172 are connected to the two ends of the arc-shaped plate portion 171 in the length direction and are located on one side of the inner arc surface of the arc-shaped plate portion 171. In this way, when installing the arc-shaped pressing plate 17, the problem of inconvenience in installation caused by the hinged portion 172 being confined 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 invention, the hinged portion 172 is a hinged sleeve, the outer wall of the hinged sleeve is integrally connected to 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 hinged sleeve is arranged between the two lugs and aligned with the two rotating holes, and the two lugs and the hinged sleeve are hinged 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 into the steel pipe 200, in some embodiments of the present invention, the pressure cylinder assembly 140 also includes a power supply module 144. The top surface of the mounting seat 112 is also provided with a mounting groove 113. The power supply module 144 is installed in the mounting groove 113 and is electrically connected to the corresponding two electric-controlled hydraulic cylinders 141. This can further simplify the docking process of the steel pipe 200, and the power supply module 144 is directly integrated on the mounting seat 112, making the entire system more compact, reducing external wiring, facilitating installation and maintenance, and being able to cope with the dirty and messy environment of the construction site.

[0048] Furthermore, in some embodiments of the present invention, the pressure regulating mechanism 14 also includes a control module and a plurality of load detection modules, wherein the plurality of load detection modules are respectively connected to the plurality of electric-controlled hydraulic cylinders 141 one by one and are capable of detecting the load of the corresponding electric-controlled hydraulic cylinders 141; the control module is electrically connected to each of the load detection modules to receive the detection signal of the load detection module, and the control module is also electrically connected to the plurality of power supply modules 144 to control the operation of the power supply modules 144. With such a configuration, the detection signal of the load detection module can be received by the control module, and the working condition of each electric-controlled hydraulic cylinder 141 can be precisely controlled to ensure the accuracy and consistency of pressure regulation. In addition, real-time monitoring and control can prevent equipment damage caused by overload or abnormal pressure, thereby enhancing the safety of the system.

[0049] In some embodiments of the present invention, the projection of the piston 143 in the sliding direction is located in the corresponding avoidance opening 111. This can prevent the piston 143 from being restricted by the inner sleeve 11 during the movement of the arc-shaped pressure plate 17, and prevent a large force from being generated between the arc-shaped pressure plate 17 and the inner sleeve 11, thereby increasing the load of the pressure cylinder assembly 140 and wasting energy.

[0050] In some embodiments of the present invention, the angle between the sliding axes of the two pistons 143 connected to one arc-shaped pressing plate 17 is not less than 75 degrees and not more than 105 degrees. Specifically, it can be 75 degrees, 85 degrees, 90 degrees, 95 degrees, 100 degrees, 105 degrees, etc., so that when the pressure cylinder assembly 140 drives the arc-shaped pressing plate 17 to move, it can bend and deform itself to form an arch, and can move as a whole under the drive 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 accelerating the construction efficiency. In addition, when the angle between the sliding axes of the two pistons 143 connected to the arc pressure plate 17 is an acute angle or an obtuse angle, each has its own advantages. If the angle between the sliding axes of the two pistons 143 connected to the arc pressure plate 17 is an obtuse angle, when the arc pressure plate 17 is against the inner wall of the steel pipe 200, the arc pressure plate 17 has a tendency to open, and the piston 143 is less affected by the bending moment of the arc pressure plate 17, which has little impact on the working stability of the pressure cylinder; if the angle between the sliding axes of the two pistons 143 connected to the arc pressure plate 17 is an acute angle, in the process of the piston 143 driving the arc pressure plate 17 to bulge from the initial position to the inner wall of the steel pipe 200, the deformation of the arc pressure plate 17 itself is small, which avoids the generation of a large interaction force between the arc pressure plate 17 and the piston 143 before the arc pressure plate 17 contacts the inner wall of the steel pipe 200.

[0051] In some embodiments of the present invention, four arc-shaped pressure plates 17 are provided, and four pressure cylinder assemblies 140 are correspondingly provided, and the arc-shaped pressure plates 17 and the pressure cylinder assemblies 140 are arranged alternately along the circumference of the inner sleeve 11. By arranging four arc-shaped pressure plates 17 and pressure cylinder assemblies 140 alternately along the circumference, it can be ensured that the pressure on the inner wall of the steel pipe 200 is more evenly distributed, local stress concentration is reduced, and the stability and reliability of the docking structure are improved. The number of four arc-shaped pressure plates 17 is relatively appropriate. On the one hand, it can cover more inner wall area of ​​the steel pipe 200 and increase the contact area, thereby improving the sealing and stability of the docking of the steel pipe 200. On the other hand, the structural complexity is low and it is easy to repair.

[0052] In some embodiments of the present invention, the connection structure 12 includes a disk body 121 and a plurality of connection ribs 122, the periphery of the disk body 121 is connected to the periphery of the port of the inner sleeve 11, one end of the plurality of connection ribs 122 is connected to the side of the disk body 121 away from the inner sleeve 11, and the other end is connected to the flange 13. The design of the disk body 121 and the connection ribs 122 can significantly improve the overall strength and rigidity of the connection structure 12, so that it can withstand greater loads and pressures. The connection ribs 122 help to disperse and transfer loads, reduce stress concentration between the inner sleeve 11 and the flange 13, and improve the stability of the entire structure. The plurality of connection ribs 122 are generally arranged at equal intervals along the circumference of the disk body 121, so that the disk body 121 and the flange 13 can be evenly stressed. In addition, the spacing between the connection ribs 122 can avoid the opening of the flange 13, so that the two flanges 13 can be connected by bolts.

[0053] In some embodiments of the present invention, a first through hole is opened at the center of the disk body 121, a second through hole is opened at the center of the flange 13, and an avoidance channel between the first through hole and the second through hole is reserved in the middle of the plurality of connection structures 12. The first through hole and the second through hole can not only eliminate stress, but also can be used in combination with the avoidance channel for routing or other purposes during construction.

[0054] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A steel pipe butt joint structure (100), characterized in that: It comprises two internal flanges (10), each of the internal flanges (10) comprising: An inner sleeve (11), the inner sleeve (11) being used for being nested with the steel pipe, the wall surface of the inner sleeve (11) being provided with at least three avoidance openings (111), and the plurality of avoidance openings (111) being arranged at intervals along the circumference of the inner sleeve (11); A connecting structure (12), one end of which is connected to the inner sleeve (11); A flange (13), the flange (13) being connected to an end of the connection structure (12) away from the inner sleeve (11); A pressure regulating mechanism (14) is mounted on the inner wall of the inner sleeve (11), and the pressure regulating mechanism (14) is formed with a plurality of output ends for outputting power; At least three arc-shaped pressing plates (17), the arc-shaped pressing plates (17) having a width direction and a length direction, the two ends of the arc-shaped pressing plates (17) in the length direction are respectively connected to the corresponding output ends, the outer arc surface of the arc-shaped pressing plates (17) protrudes from the outer surface of the inner sleeve (11) through the avoidance opening (111), and the arc-shaped pressing plates (17) can be arched up under the drive of the output end to press against the inner wall of the steel pipe; The flanges (13) of the two inner flanges (10) are connected by bolts, and the projections of the connection structure (12) and the flanges (13) in the axial direction of the inner sleeve (11) are located inside the inner sleeve (11).

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

3. The steel pipe butt joint structure (100) according to claim 2, characterized in that: 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 mounting seat (112) is located between two adjacent avoidance 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 (143) rods of the two electrically controlled hydraulic cylinders (141) extend in directions away from each other, and the output end is the end of the piston (143) rod away from the cylinder body (142).

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

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

6. The steel pipe butt joint structure (100) according to claim 5, characterized in that: The pressure regulating mechanism (14) further comprises a control module and a plurality of load detection modules, wherein the plurality of load detection modules are respectively connected to the plurality of electric-controlled hydraulic cylinders (141) one by one and are capable of detecting the loads of the corresponding electric-controlled hydraulic cylinders (141); The control module is electrically connected to each of the load detection modules to receive detection signals from the load detection modules. The control module is also electrically connected to a plurality of the 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 in that: The projection of the piston (143) in the sliding direction thereof is located in the corresponding avoidance opening (111).

8. The steel pipe butt joint structure (100) according to claim 3, characterized in that: The included angle between the sliding axes of the two pistons (143) connected to the arc-shaped pressure plate (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 in that: Four arc-shaped pressure plates (17) are provided, and four pressure cylinder assemblies (140) are provided correspondingly. The arc-shaped pressure 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 in that: The connection structure (12) comprises a disk body (121) and a plurality of connection ribs (122), wherein the periphery of the disk body (121) is connected to the periphery of the port of the inner sleeve (11), one end of the plurality of connection ribs (122) is connected to a side of the disk body (121) away from the inner sleeve (11), and the other end is connected to the flange (13).

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